vol-ii-tech spec ayakara bhawan 1
TRANSCRIPT
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
1/74
TENDER DOCUMENTS
FOR
Construction of 11kV Line from 33/11kV Sishubhawan Substation to
Ayakara Bhawan at Cuttack, Odisha
Volume II
Technical Bid
CENTRAL ELECTRICITY SUPPLY UTILITY OF ORISSA (CESU)
IDCO TOWER, 2nd Floor, Janpath, Bhubaneswar-751022
TELEPHONE: (0674) - 2542895, 2545681, 2541727
FAX: 0674 2543125
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
2/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
CENTRAL ELECTRICITY SUPPLY UTILITY OF ODISHA
(CESU)Head Office: IDCO TOWER, 2nd Floor, Janpath, Bhubaneswar-751022
TELEPHONE: (0674) - 2542895, 2545681, 2541727
FAX: 0674 2543125
BID ENQUIRY NO:CESU. H.Qrs./P&S/523/12-13/24764/Dt: 30.07.2012
BIDDING DOCUMENTS
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
3/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
BID DOCUMENTS CONSIST OF THE FOLLOWING VOLUMES
VOLUME- I (COMMERCIAL REQUIREMENTS)
1. Section I :-Invitation For Bids - IFB
2. Section II :-General Terms and Conditionsof the Contract - GTCC
3. Section III :-Price Schedule Format - PSF
4. Section IV :-BID Proposal Letter - BPL
5. Section V :-ANNEXURE - ANNEX
VOLUME-II (TECHNICAL REQUIREMENTS)
1. Section I :-General
2. Section II :-Porcelain clad 11kV Switch Gear
3. Section III :- 11kV UG Cable
4. Section IV :-HT cable joints and terminating kits.
5. Section V :-Cable Laying Methodology6. Section VI :-Lightning Arrestor
7. Section VII :-11kV AB Switch
8. Section VIII :-Proposed route map
VOLUME- III (BID PROPOSAL SHEETS)
1. PART A :-PRICE SCHEDULE SHEETS WITH BOQ
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
4/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
Section-I
General
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
5/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
1.0. INTRODUCTION:
The CENTRAL ELECTRICITY SUPPLY UTILITY OF ODISHA,
hereinafter called CESU/OWNER is inviting Bids in respect of Total Turnkey Package for
construction of 11KV UG Cable DC Feeder (Main + Standby) by using 3x400mm2 ,11KV, XLPE
Cable from Sishubhawan 33/11kV S/s to Ayakar Bhawan at Shelter Chhaka, Cuttack, Odisha on
Total Turn Key basis including supply of all Equipments/Materials Erection (including Civil
Works), Testing and Commissioning as per the Scope detailed in the Bid Documents.
2.0. NATURE OF WORK:
The work covered by this Specification is for 11kV distribution lines as specified herein and in the
attached Schedules. The Underground distribution lines will form a part of the CESUs distribution
System.
3.0. SCOPE:
Construction of 11kV Line from Sishubhawan 33/11kV S/S to Ayakar Bhawan at Shelter Chhaka,
Cuttack, through underground Cables and accessories.
The work Involves:
a) Establishing additional 11kV Terminal bay with all 11 kV switch gear equipments and other
modification works at existing 33 /11kV Substation at Sishubhawan, Cuttack.
b) Laying of double circuit of UG cable (Main + Standby) using 3core x 400mm2, 11kV, aluminium,
XLPE insulation armoured dry cured power cable for a Circuit length of 1.85km(double ckt.).
c) Installation of 11KV metering unit at the proposed 6 pole structure at Ayakar Bhawan.
d) Erection of 11 kV Lightning Arrestors (6 nos).
e) Erection of 2 set of 400Amp,AB Switch unit.
f) Straight through Jointing kits (3 core/ 3 phase) with Heat shrinkable type suitable for
11kV class, 3 core 400 sq. mm HT, XLPE UG Cable (22 nos)
g) Jointing of Indoor terminating end kit (3 core/ 3 phase) with Heat shrinkable type
suitable for 11kV class 3 core 400 sq mm HT XLPE UG Cable (2 nos)
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
6/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
Bill Of Material for construction of 11KV UG Cable DC Feeder (Main + Standby) by using 3x400mm,
11KV, XLPE Cable from Sishubhawan 33/11kV S/s to Ayakar Bhawan at Shelter Chhaka, Cuttack,
Odisha on Total Turn Key basis
Sl
NoParticulars Unit Quantity
1Supply of materials for new 11KV bay one no at Sisubhawan S/s with CT,
PT, Breaker, Isolator & Structure etc.No 1
2 Supply of materials for Underground Cabling work
i) Supply of 3core x 400mm, 11KV XLPE Under Ground Cable (2 runs =
Main + Standby)( Cable supply =(1.85 x 2)+ 16% extra =4.3km)Km 4.3
ii) Supply of Cable Jointing kit (3 core/ 3 phase) for 400mm, 11KV XLPE
Cable (straight through)Nos. 22
iii) Supply of Cable Jointing kit of Indoor Terminating (3 core/ 3 phase) for400mm, 11KV XLPE Cable
Nos. 2
iv) Supply of Cable Jointing kit of Outdoor Terminating (3 core/ 3 phase)
for 400mm2, 11KV XLPE CableNos. 2
V) Supply of Earthing materials for cable with 2.5 mtr. long (including
supply of 40NB, 3mtr of GMS pipe, 80mmx12mm Earthing GI strip, Salt &
charcoal).
Nos. 4
Vi)11KV ,AB Switch 400Amps Set 2
Vii)11KV, LA at both terminating end of cable Nos. 6
Vii)PVC Pipe for cable erection at 6 pole structure,200mm dia" mtr 25
3 Supply of Materials for installation for 11kV Metering Unit at the proposed 6pole structure
i) 11KV Metering Unit NoCESU
Supply
ii) 11KV LA Nos 3
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
7/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
x) 50 X 40 X 6mm MS Angle MT 0.02
xi) No. 6 GI Wire Kg 2
xii) Nut & Bolt of different sizes Kg 6
xiii) Earthing Device (40mm dia GI) with materials nos 4
xiv) Sundries for Ampere Tape ,PVC Tape, Sockets etc. LS
4.0. Methodology:
The complete procedures for the execution of the project are explained herewith in details.
i. Detailed survey of the area and routes from Sishubhawan 33/11kV S/S to Ayakar Bhawan
at Shelter Chaka, Cuttack, as shown in the Geographical diagram / Schematic diagram of
the tender document and preparation of fresh Geographical & schematic diagrams showing
the position of Laying of Cables to be done by the bidder.
ii. Complete manufacture, including shop testing & supply of all materials / equipments from
the approved vendor or from his manufacturing units.
iii. Providing Engineering drawing, data, operational manual, etc for the Purchasers approval;
iv. Packing and transportation from the manufacturers works to the site.
v. Receipt, storage, preservation and conservation of equipment at the site.
vi. Pre-assembly, if any, erection testing and commissioning of all the equipment.
vii. Reliability tests and performance and guarantee tests on completion of commissioning.
viii. Loading, unloading and transportation as required.
ix. Laying of 11kV, XLPE UG cable by Horizontal Directional Drilling method .
x. Formation of additional one 11 kV outdoor bay and installation of outdoor 11kV Porcelainclad switch gear for new 11kV feeder at Sishubhawan sub station.
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
8/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
xvii. Getting the complete 11kV network system inspected by Electrical Inspector aftercompletion of work.
xviii. Cable route marking by standard methodology.
xix. Cable looping at the either sides of the cable.
5.0. Technical specifications for supply of materials:
The supply of all the required materials for this TOTAL TURN KEY project is in the scope of the
contractor. The technical specifications for the major materials required are dealt herewith in the
following sections of this volume. The following is the list of the Technical specifications for
materials/equipments
1. 11kV Class HT 3core UG cables, XLPE insulated, 400 mm, Aluminium
2. 11kV class XLPE insulated straight through jointing Kits and end Terminations for HT
UG Cables of 400mm size.
3. 11 kV class Lightning arrestor.
4. 11kV class 11 kV AB switch.
5. 11KV metering unit at the proposed 6 pole structure
6. 11kV class Porcelain clad circuit Breakers for 33/11kV substation.
7. Laying of HT UG Cables.
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
9/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
Section-IIPorcelain clad 11kV Switch Gear
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
10/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
TECHNICAL SPECIFICATION OF 11KV CLASS PORCELAIN CLAD SWITCHGEAR
1.0 SCOPE:
The scope of this specification is for design, manufacture, testing, and supply of outdoor 11 KV
class porcelain clad switchgear suitable for installation for use in a 3-phase 50Hz, 11KV solidly
earthed system. The switchgear assembly shall consist of complete with all components such as
circuit breakers, control gear, instrument transformers, meters, relays, switches, indicating lamps,
test blocks, current transformers, voltage transformers etc. which are required in each panel for
satisfactory and efficient performance of the switchgear. The switchgear shall suit outdoor
installation.
2.0 APPLICABLE STANDARDS :
The switchgear shall confirm to the following standards namely BIS Bureau of Indian
Standards and IEC International Electro Technical Commission.
Sl No IS / IEC Nos Equipments & components.
1 IS 5 Paints, Finishing Exterior
2 IS 513 Cold rolled low carbon steel sheets and strips.
3 IS 641 Paints, Finishing interior White
4 IS 722 A.C. Electricity meters
5 IS 722Parts(1)to(5)(7)to(9)
Direct acting indicating analogue electrical measuring Instruments
and their accessories.
6 IS 1730 Steel sheet and strip dimensions
7 IS 1951 PVC sleeving for electrical purpose.
8 IS 2419 Dimensions for panel mounted indicating instruments.
and electrical recording
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
11/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
15 IS 3842
Parts I to XII
Application guide for Electrical relays for
protection and other relays.
16 IS 4146 Application guide for voltage Transformers
17 IS 4201 Application guide for current transformers
18 IS 477 Performance tests for protective schemes used in
protective of light gauge steel against corrosion
19 IS 4794
parts I to IIPush button switches
20 IS 5608Parts I to IV
PVC wires and sheaths
21 IS 6236 Direct recording electrical measuring instruments
22 IS 6875 Control Switches
23 IS 7118 Recommendation for direction movement for
control device, operating electrical devices.
24 IS 8130 Conductors for insulated Electric cables.
25 IS 8197 Terminal markings of electrical measuring
instruments and accessories.
26 IS 8686 Static protective relays.
27 IS 9224
Parts I to II
Pictorial surface preparation standards for
painting of steel surfaces.28 IS 9954 Code of practice for installation of switchgear
29 IS 10118 Code of practice for installation of switchgear
30 IS 10276 Edison screw lamp holders
31 IS 11431 Code of practice for packaging of electrical
Indicating and recording instruments32 IEC 56 High voltage alternating current circuit breakers1987
33 IEC 694 Common clauses for high voltage switchgear and
control gear standards.
34 IEC 687 Static watt hour meters for class 0 25 and 0 5
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
12/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
Ref Nos Ref Clauses
i IS-3427 Clause- 2 and sub clauses there of for switch gear.
ii IEC-56 Clause - 3 and sub clauses there of for circuit breakers
iii IS-13118 Clause - 3 and sub clauses there of for circuit breakers
iv IS-2705 Part- I to IV clause-2 &sub clauses there of for current transformers.
v IS -3516 Part -I clause-2 &sub clauses there of for voltage transformers
4.0 DESIGN AND CONSTRUCTION:
4.1 GENERAL.
4.1.1 The Circuit breaker shall be provided with vacuum interrupters hermetically Sealed. The
vacuum bottles are to be mounted in side porcelain enclosure and Placed on a sheet metal
enclosure having main operating links. The mechanism is to be placed under this and
connected by a link, which transmits mechanical power to circuit breaker. The entire assembly
shall be mounted on an elevated structure to provide live point clearance as per IS 10118.
4.1.2 Control and relays shall be mounted in out door sheet steel KIOSK. The minimum thickness of
the galvanized steel sheet shall not be less than 3.5 mm for the base and load bearing
members and not less than 3.0 mm for the top cover, side sheets, doors and partitions.
Galvanized Sheet steel shall be cold rolled confirming to IS 513. The panel door shall be
provided with louvers and with translucent plastic covered windows directly opposite to the
close/open indicating lamps and spring status indicator. The panel door shall be hinged, swing
door provided with pad locking facility. Rear door shall also be hinged on one side and bolted
on the other side.
4.1.3 The design and construction shall be with the following features:
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
13/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
4.2 INTERLOCKS :Generally as per clause 3.4(e) with mechanical interlocks of IS 3427.
4.3 EARTHING :
Generally as per 3.5 of IS 3427. However the earthing conductor shall be of copper flat shall
not be less than 25 X 6 mm. Earthing shall be suitable to receive 50 X 6 mm GI flat of station
earthing in the 2 bolts of M.12 size.
4.4 SWITCHGEAR COMPONENTS:
The following shall be components in the PC, VCBs.
Vacuum interrupters mounted in porcelain enclosures
Current transformer
Instruments and protective relays selector switches
Interconnections between breaker and instrument transformers
Terminal connectors to receive ACSR Lynx conductor
Control switches, indicating lamps, contactors and test terminal blocks
Voltage transformer.
Control cabling from instrument transformers secondary box to control and relay kiosk with
cable glands.
4.5 GENERAL ARRANGEMENT OF COMPONENTS:4.6 Various switchgear components are to be arranged.
4.7 The interconnections are in scope of supply of the tenderer.
4.8 The following shall be provided in each panel as applicablea) Cubicle space heater with thermostat
b) View glass for breaker position indication
c) Names plates
d) Danger board
e) Operation counter for the breaker
f) Spring charging handle
5 0 GENERAL ARRANGEMENT OF THE SWITCHGEAR PANELS:
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
14/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
Rated voltage as per clauses 4.2 if IS 3427 for nominal system voltage of 11 KV
Rated insulation level 28KV / 75KV peak for 11KV nominal system voltage.
Rated frequency 50Hz
Rated normal current 1250A for incomer /800A for feeder.
Rated short time current 20 KA
Rated Peak short time current,. As per clause 4.7 of IS 3427 and in conjunction
with sub-clauses (e) supra.
Degrees of protection. Corresponding to IP 55 of Is-12063.
The temperature rise limits for the various materials shall be as per table V of IEC
694.
7.0 SWITCHGEAR COMPONENTS:
Rated values of the components forming part of the meal enclosed switchgear and control
gears are detailed here below individually against each component.
7.1 Circuit breakers :
a) Type : vacuum
b) Rated voltage 11KV rms.
c) Highest system voltage 12KV rms.
d) Frequency 50Hz
e) Number of poles three
f) Class outdoor.
g) Power frequency withstand voltage: 258KV rms.
h) Impulse with stand voltage- 75KVP
i) Rated normal current 630 A.
j) Rated symmetrical breaking current- 25KA
k) Rated transient recovery voltage: as per clauses 4.102.2,4.102.3 of
IEC 56, table II A for 12KV rated voltage.
l) Rated making current peak : 50 KVA
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
15/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
i) Space heater -AC 230V, S.Ph 50 Hz.
ii) Spring charging motor AC 230V, S.Ph 50 Hz.
iii) Cubical illumination AC 230V, S.Ph. 50 Hz.
q) Method of closing and opening The breaker shall be capable of discharging the energy
stored in spring. These springs should be capable of being compressed or charged by an
AC motor. It should be possible to charge the springs manually by means of a spring
charging handle or lever. During manual charging of the springs an electromechanical
device shall be provided to prevent charging of the same by the motor. The springs should
also be capable of being charged even with the breaker in the closed position so as to
restore tension in the springs. Besides, there should be provision to automatically cut off
power supply to the motor when the springs are fully charged and also to automatically
switch on the power supply to the motor when the springs are fully discharged. Thereshall also be provision to indicate springs status namely FREE / Charged by means of
a mechanical lever at the panel. This shall be arranged through potential free auxiliary
contacts or limit switches. The mechanism shall be provided with an anti pumping device
to prevent closing impulses from being transmitted, to the closing coil when the breaker is
in the closed position.
r) Auxiliary Contacts : 8 No+8NC conforming toclause 5.4 of IEC 694.
s) Name Plates . As per clause 5.9 of IEC 56.t) Requirements for simultaneity of poles As per Clause 5.101 of IEC 56.
7.2 CURRENT TRANSFORMERS
7.2.1 The current transformers shall conform in all respects to IS 2705 parts I to IV.The
arrangement of current transformers in porcelain clad switch gear is shown in sketch 1&2.
7.2.2 CTs shall be encapsulated resin cast or poly crate to suit outdoor instalation.
7.2.3 CT ratio changing is preferred on Secondary side.
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
16/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
g. Accuracy class- burden
Core 1 (metering ) : 0.5/15VA
Core 2 (OCR,EFR &
REFR Protection) : 5 P20/15VA
Core 3 (differential
Protection) : PS/VK Min 300V
h. Instrument security factor : 5 at all ratios
i. Earthing : As per clause 4.3
of IS 2705 (part-1)
j. Short time current Rating
i. Thermal rating : 25 KA for 1 second
ii. Dynamic rating : As per clause 562 of IS2705 part-I
k. Terminal Marking : As per Clause 6.2 of IS 2705 part-I
l. Rating Plate : As per Clause 6.1 & 7.1 of 2705
7.3 METERING INSTRUMENTS:
7.3.1 Meters to be mounted shall conform with IS 1248 Parts (I to IX) and dimension shall conformto IS-2419.
7.3.2 All meters shall be CT/VT Secondary operated instruments and shall be flush mounted withonly the bezels projection.
7.3.3 All meters shall be wired at the back and shall be provided with tropicalised dials, to ensurefreedom from warping, iscoloration or fading.
7.3.4 The lettering/Numbering on dials shall be in bold black on white dial background.
7.3.5 All meters shall be magnetically shielded.
7.3.6 All indicating analog meters shall be provided with a screw type zero adjuster for the needlewith facility to operate from the front of the panel without having to remove the cover of themeter.
7 3 7 All h ll b i d h h i l bl k f ili i d d lib i f
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
17/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
B) Watt meter:
I. One number to be provided in each panel.
II. Type: 3 phase3 wire two element dynamometer.III. Size 96 X 96 mm.IV. Accuracy class: 1.5.V. Range: 0-200 KWSVI. Scale : 90 degrees and end suppressed
C) VAR Meter:
I. One number to be provided in each panel.
II. Type: 3 phase 3 wire two element dynamometer.
III. Size 96 X 96 mm.
IV. Accuracy class: 1.5.
V. Range: 0-200 KVAR
VI. Scale: 90 degrees and end suppressed
D) Electronic Tri vector Meter:
I. One number to be provided
II. It shall be static type 3 phase, 3 wire, 2 element, suitable for 1
amp CT & 110 volts phase to phase V.T secondaries. It must be
flush mounted type & tropicalised. It shall have separate registers
for recording kWHr & kVAHr consumption seperately, maximum
demand (with resetting facility), both for import and export modes.
III. The accuracy class shall be 0.5.
IV.The meter shall have legible LED/ LCD minimum 6 digit auto
cycle display and non volatile memory with out battery back up.
V.The meter shall have galvanically isolated optical.
VI.The meter shall be capable of storing the complete half hourly
data required for load analysis & energy audit for a period of 35
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
18/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
The following relays are to be provided.
a) Electronic Relay: Combined unit for OCR & EFR for line side.
7.5 Control switches:7.5.1 General :
The control switch shall contain two electrically independent double break contacts and shall
be moulded in a self extinguishing plastic compound with inherent arc quenching and high
insulating property enclosed moulding giving a high degree of dust protection. The back of
control switch is to be shrouded in transparent cover, automatic spring return to neutral switch
type to be provided. The switches shall be suitable for 20 Amps continuous rating and 110V
DC.
7.5.2 Requirement :a. One No. in each outgoing panel.
b. One No. for each outgoing breaker in the annunciator panel for remote operation.
7.6 SELECTOR SWITCHES (FOR AMMETER AND VOLTMETERS)
7.6.1 General :These shall be slow break, quick-make, rotary type, stay put switches, and shall be suitable
for flush mounting. These switches shall be suitable for being operated by flush mounting.
These switches shall be suitable for being operated by a knob from the front face of the panel.
They shall be suitable for 10 Amps continuous rating and 415V AC. The ammeter selector
switches shall short circuit the CT secondary before it is broken and remove the short circuit
after the ammeter is inserted in the circuit. All the switches shall have position indication plates
4 ways i.e., R, Y, B and OFF.
7.7 Indication lamps:
7.7.1 Indication lamps shall be integral LED module type 0.5 watts, suitable for 110 volts D.C.and
these shall be integral self contained LED indicator units which can be directly mounted in the
panel. The rated input voltage can be directly applied to the module input as all the controlling
circuitary is built is built in to the module body it self. These modules shallbe suitable for panel
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
19/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
7.7.3 REQUIREMENT OF LAMPS
a) One set of green, amber and red lamps in each incomer and outgoing panels along with
spring status violet / Blue and trip circuit healthy white on command.
b) One set of green, red, amber, violet / blue and white lamps for indicating the status of each
incomer and outgoing breakers in the remote indoor annunciation panel
7.7.4 10% of the total of integral LED module type lamps for each panel shall be supplied as spare
without extra cost.
7.8 FUSES:
6.8.1 GENERAL:
All fuses shall be moulded bakelite complete with fuse bases, fuse carriage and HRC cartridge
fuses. All fuse fittings should be labeled by etching on an anodized plate with details of the
fuse rating and the circuit for which the fuse is provided.
6.8.2 RATING:
i. AC 115V for all supply fuses.ii. DC 110V for DC circuits
1.8.3 Rated Current : AS per clause 5.3 of IS 9224 (Part-I) 1979 (Preferred value of rated current 32
Amps)
6.8.4 REQUIREMENTS:
All AC and DC circuits shall be provided with suitable fuses and fuse links for each phase /
pole.
6.8.5 10% of the H.R.C fuse cartridge shall be supplied as spares without Extra cost.
7.9 WIRING:
7.9.1 GENERAL:
The wiring shall be done by using PVC-insulated 660 V annealed stranded Copper
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
20/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
c) All wiring shall be provided with alphanumeric ferules at either ends as
per the wiring schedule.
d) All terminals shall be nut & stub type of brass coated with Nickle of size
M6.
7.10 TEST TERMINAL BLOCKS:
The Test terminal blocks required are for testing while in service and shall be of the 3 phase 4
wire, front adjustable, link type, projected, mounted with screwed cover and wired at the rear,
rated for 10 Amps, The wiring shall be so as to short circuit the CT phase to the star point and
it shall be possible to calibrate through external injection.
7.11 Galvanising
7.11.1 All the steel frame work and surface of the steel panels shall be fully galvanized to with stand
saline weather in the coastal areas.
7.11.2 Block No. shall be assigned for each compartment and the same shall be stencilized in white
paint on the inside of panel.
7.12 TERMINAL PAD / CONNECTORS:The Terminal Connectors for CTs and porcelain clad breakers shall suit to receive ACSR Lynx
of 10 mm dia minimum 4 bolt connection.
7.13 FOUNDATION BOLTS:Foundation bolts with 10% spares are in the scope of supply of the supplier.
7.14 AUXILARY DC SUPPLY :The auxiliary 110 V D.C. supply will be arranged from station battery panel.
7.15 AUXILIARY AC SUPPLY:The auxiliary A.C. supply at 3phase 415 volts will be arranged from the Biomass generating
unit 1 & 2
7.16 INDOOR TYPE COMBINED REMOTE CONTROL & ANNUNCIATOR PANEL.
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
21/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
7.16.2 Wiring:All wiring from the outdoor panel shall be terminated on the terminal blocks inside the
cubicle. The terminal block shall be Brass stud and nut type of size M6. The terminal blocks
shall be of moulded resin type provided with plastic shrouds. Sufficient spare terminals shall
be provided on the terminal blocks. Paint shade of annunciator panel shall be opaline green
of shade No. 275 of IS 5
7.16.3 Annunication facia windows shall be with plastic facia sheet engraved with letters of 5 mm
size. The inscriptions shall be visible only when the facia is lighted. The lamps shall be
suitable for 110 V DC with an in built resistor. The initiation of annunciation shall be
through NO-NC contracts of the relay.
A hooter suitable for 110V DC shall be installed in the annunciator panel for alarms
7.16.4 REQUIREMENT OF ENGRAVING IN THE ANNUNICIATOR DESK:
i. No. of Windows 5
OCR R Phase operated 1 >
OCR B phase operated 1 > Trip alarm
EFR operated 1 >
Deferential relay operated 1
DC fuse failure 1 > Non Trip
No. of windows spare 1
Master trip relays 1
ii. Breaker open indication lamp 1
iii. Breaker close indication lamp 1
i S i f / h d i di ti l 2
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
22/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
8.1.2 Routine Tests:
As per clause 8.12 (1), (b) & (e) of IS 3427 1969.
9.1 TESTS ON CIRCUIT BREAKERS:
9.1.1 TYPE TESTS:
As per clause 6.0 of IS 13118.
9.1.2 ROUTINE TEST:
As per clause 7.0 of IS 13118.
9.2 TEST ON CURRENT TRANSFORMERS :
9.2.1 TYPE TEST :
a) As per clause 7.1.1(a) to (h) of IS 2705 (Part-I)-1981.
e) As per clause 8.1 of IS 2705 (Part-II)- 1981.
f) As per clause 8.2 of IS 2705(Part-III)-1981.
g) As per clause 8.3 of IS 2705(Part-III)-1981.
h) As per clause 6 of IS 2705(Part-iv).
9.3 TEST ON VOLTAGE TRANSFORMERS :
9.3.1 TYPE TESTS:
i) As per clause 6.1.1 of IS 3156(part-1)-1978.
a. As per clause 8.1 of IS 3156(part-II), 1978.
b. As per clause 9.1 of IS 3156(part-III)-1978.
9.3.2 ROUTINE TESTS:
i) As per clause 8.1.2 of IS 3156(part-I)-1978.
ii) As per clause 8.2 of IS 3156(part-II- 1978. As perclause 9.2 of IS 3156(part-III)-1978.
9.4 TESTS ON RELAYS:
9.4.1 Type tests and routine tests as per IS 3231 and IEC 255 shall be conducted.
9.4.2 TYPE TESTS:
Type test reports not older than 5 years on the date of bid opening pertaining to all type tests
T d S ifi i f T h i l R i f 11kV Li A k Bh / CESU / Odi h
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
23/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
b) Indicating lamps.--- one set of the following for each breaker.
I. Green.
II.
Red.III. Amber.
IV. Violet. /Blue.
V. White
c) Fuse.------------------- one No.
d) Bell.-------------------- one No.
e) Hooter .---------------- one No.
f) Electromechanical announciator relay.
g) Push button
i. Accept,--- one No.
ii Reset.---- one No.
iii Lamp test.-- one No.
iv Hooter test.--- one No
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
24/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
Section-III
11kV UG Cable
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
25/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
TECHNICAL SPECIFICATIONS FOR 11KV, XLPE INSULATED UG CABLE
1.0 SCOPE :1.1 The scope of this specification covers the design, manufacture, stage inspection at works,
inspection and testing the finished cables 6.35 /11KV aluminum conductor. Three Core,
400 mm, XLPE insulated screened, underground cables at manufacturers works.
2.0 RATED VOLTAGE
2.1 The rated voltage of the cable shall be 11000 Volts AC with the highest system voltage of
12000 Volts between phases of the effectively earthed three phase-distribution system.
3.0 APPLICABLE STANDARDS:
3.1 Unless otherwise stipulated in the specifications, the latest version of the following
Standards shall be applicable.
a. IS 8130 Conductors for Insulated electrical cables and flexible cords
b. IS 10810 (series) Methods of tests for cables
c. IS 10418 Drums for electrical cables.
d. IS 7098 (Part 2) Cross linked Polyethylene Insulation for Cables.
e. IS 3975 Specification for mild steel wires, strips and tapes for armoring of
cables.
f. IS 5831 Specification for PVC insulation sheath for electric cables.
Dimensions of protective coverings of cables
Part 1 Elastomeric and thermoplastic insulated cables.
3.2 The Cables manufactured to any other Internal Standards like BSS, IEC or equivalent
standards not less stringent than Indian Standards are also acceptable. In such cases, the
Bidders shall enclose a copy of the equivalent international standard, in English language,
along with the bid.
4.0 CONSTRUCTION:
4.1 Conductor :- The conductor shall be composed of compacted circular aluminumwires complying with IS 8130.
4.2 Insulation : - The insulation shall be cross linked polyethylene conforming to the following
requirements.
Sl.NO. Properties Requirements
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
26/74
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
b) Elongation under load175 percent, Max
c) Permanent elongation (set) after cooling
15 percent, Max5. Shrinkage:
a) Treatment : Temperature
Duration
130+ 30 C
1 hour
b) Shrinkage4 percent, Max
6. Water absorption (Gavin metric) :
a) Treatment : Temperature
Duration
85+ 20 C
14 days
b) Water absorbed1 mg / cm2, Max
7. Volume Resistivity
a) at 270 C
b) at 700 C
1 x 1014 ohm-cm, Min
1 x 1013 ohm-cm, Min
4.3 The screening shall consist of non-metallic semi conducting compound and copper tape,
shielded cores laid up with fillers, inner sheath of extruded PVC, Galvanized steel strip
Amour and PVC ST-2 overall sheath.
4.4 The cables should be suitable for use in solidly earthed system.
4.5 The 6.35/11KV underground cables shall be manufactured to the highest quality, best
workmanship with scientific material management and quality control. The bidder shall
furnish the quality plan, giving in detail the quality control procedure / management system.
4.6 The successful Bidder shall give sufficient advance notice to the purchaser of not less
than fifteen days to arrange for stage inspection and inspection of quality assurance
program during manufacture, at the works.
5.0 SYSTEM DETAILS
General Technical particulars
General Technical particulars
Sl No Particulars Values
1 Nominal system voltage (rms) (U) 11KV
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
27/74
e de Spec cat o o ec ca equ e e ts o V e ya a a awa / C SU / Od s a
6.0 INSTALLATION CONDITIONS :
6.1 The cables are laid directly buried in ground, in the bores formed by horizontal boring
method. The Nominal depth of laying is up to 2000 mm (from top, of ground to centre ofcable).However, in trenchless horizontal bore method, the bore can go upto a depth of a
maximum of 2 meter. Nature of soil is heterogeneous, sandy, Soil resistivity varies between
18 to 100 ohmmeter and the Thermal resistivity is around 1200 to 1500 C/ Cm/w.
7.0 CLIMATIC CONDITIONS :
7.1 The climatic conditions where these 11KV cables will be installed are as under :
Climatic conditions
Sl No Particulars Details
1 Location: Cuttack, Orissa
2 Altitude As is coastal area, altitude will Not exceed
100 M above MSL.
3 Max Daily average air temp : 45 0 C
4 Minimum ambient air temp : 10 0 C5 Ground temperature at
depth of laying assumed :
350 (Max) 50 C (Min)
6 Isoceraunic level 45
7 Avg. annual rainfall : 2500 mm
8 Avg. number of rainy days
per annum:
90
9 Climate: Tropical moderately hot and humid.likelihood of subsoil water at certain location
at the depth of burial of cables..
10 Soil : Normally wet
8.0 DESIGN CRITERIA :
8.1 The cables that are covered in these specifications are intended for use in the Coastal belt
of state of Orissa for Power distribution purposes, under the climatic conditions and
installation conditions described in the technical specification.
8.2 Any technical features, not specifically mentioned here, but is necessary, for the good
performance of the product, shall be incorporated in the design. Such features shall be
clearly brought out under Technical deviations schedules only, in the offer made by the
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
28/74
p q y
9.0 MANUFACTURE PROCESS:
9.1 Cross-linking of the insulation materials (pre compounded polyethylene) shall be
conforming to IS :7098 (Part-II)9.2 The conductor screen shall be extruded semi conducting compound. The insulation screenshall consist of the nonmetallic part, extrude semi conducting compound with non-magneticmetallic part. The XLPE insulation and the shield for conductor and insulation shall beextruded in one operation.
10.0 MATERIALS
10.1 Conductor: - The conductor shall be of standard construction. The material for
conductor shall consist of the plain aluminum of H2 or H4 grade as per clause 3 of IS8130 / 1984.
10.2 The Number of wires in the conductor, shall be not less than the appropriate minimum
number given in table 2 of IS 8130 / 1984.
11.0 SCREENING :
11.1 The conductor screening shall be provided over the conductor by applying non-metallic
semi-conducting compound. The metallic screen shall withstand the operating temperature
of the cable and shall be compatible with the insulating material.
11.2 The insulation screen shall be applied over the insulation. The insulation screening
shall consist of two parts; namely metallic and non-metallic. The non-metallic part shall be
applied directly over the insulation of each core and shall consist of a semi conducting tape
and extruded semi conducting compound with a semi conducting coating. The metallic
part of the insulation screen shall consist of either tape, or braid, or concentric serving of
wires or a sheath; shall be non-magnetic and shall be applied over the non-metallic part.
12.0 CORE IDENTIFICATION:
12.1 The core identification for 3 core cables shall be provided, by suitable means, like, byapplication of colored stripes, or by numerals or by printing on the cores as per clause 13of IS : 7098 Part 2.
12.2 For identification of different coloring of XLPE insulation, or by using colored strips, red,yellow and blue colors respectively shall be used to identify the phase conductors.
13.0 LAYING UP OF CORES:
13.1 For multicore cables, the cores shall be laid together with a suitable right hand lay. Theinterstices at the center shall be filled with a non-hygroscopic material.
14.0 INNER SHEATH (COMMON COVERING)
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
29/74
35 45 0.5
45 55 0.6
55 - 0.7
When one or more layers of binder tapes are applied over the laid up cores, the thickness
of such tapes shall not be construed as a part of inner sheath.
14.3 For multi core cables, the interstices at the center shall be filled with a non-hygroscopic
material. The interstices around the laid up cores shall be covered with PVC compound
type ST-2. This will form the Inner sheath for multi core-single core cables.
15.0 ARMOURING:
15.1 Armoring shall be applied over the inner sheath as closely as practicable. The Amour
shall be galvanized steel strip complying with the requirements of IS 3975. A binder tape
may be applied on the Amour. The direction of the lay of the amour shall be left hand. For
double armored cables, this requirement applies to the inner layer. The outer layer shall be
applied in the reverse direction to the inner layer, and there should be a separator of the
non hygroscopic material; such as plastic tape, bituminized cotton tape, rubber tape,proofed tape between inner and outer layers of Amour.
15.2 The dimensions of galvanized steel strips shall be as below:
Calculated diameter over Amour [IS10462 Part 1] (mm)
Nominal thickness ofSteel Strip(mm)
Over Upto and including
- 13 -
13 25 0.8
25 40 0.8
40 55 1.4
55 70 1.4
70 - 1.4
15.3 The joints in the strips shall be made by brazing or welding and the surface
irregularities removed. A joint in the strips shall not be less than 300 mm away from the
nearest joint in any other strip in the completed cable.
15.4 Bidders shall furnish the calculation / data sheet for the short circuit carrying capability
of the Armour.
16 0 OUTER SHEATH :
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
30/74
25 35 2.2
35 40 2,4
40 45 2.6
45 50 2.8
50 55 3
55 60 3.2
60 65 3.4
65 70 3.6
70 75 3.8
75 - 4
17.0 IDENTIFICATION :
17.1 The outer sheath shall have the following information embossed or indented on it; the
manufacturers name or trade mark, the voltage grade, the year of manufacture and the
letters CESU. The identification shall repeat every 300/350-mm along the length of the
cable.17.2 Note: The outer sheath of the cable should be embossed withCESU.
18.0 INSPECTION AND QUALITY CONTROL :
18.1 The Bidder shall furnish a complete and detailed quality plan for the manufacturing
process of the cable. All raw materials shall conform to relevant applicable standards and
tested for compliance to quality and requirement. During the manufacturing process, at allstages, inspections shall be made to check the physical and dimensional parameters, for
verification to compliance to the standards. The bidder shall arrange, for inspection by the
purchaser, during manufacture, if so desired by the purchaser, to verify the quality control
process of the Bidder.
19.0 TYPE TESTS :
19.1 The offered cables with same designs shall have been type tested and Test
certificates shall not be later than 5 years on the date of bid opening. Otherwise the
supplier / Turnkey contractor shall arrange for type testing at his own cost.. The
supplier /Turn Key contractor shall conduct all type tests as per IS : 7098 part-II
1985 with up to date amendments or equivalent International standard and supplies
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
31/74
(e) Physical test for outer sheath
(f) Bleeding and blooming test for outer sheath
(g) Partial discharge test.
(h) Bending test(i) Di-electric power factor test
i. As a function of voltage
As a function of temperature
(j) Insulation resistance (volume resistivity) test
(k) Heating cycle test
(l) Impulse withstand test
(m) High voltage test(n) Flammability test
19.5 The following test shall be performed successfully on the same test sample of
completed cable, not less than 10 M in length between the test accessories:
I. Partial discharge test
II. Bending test followed by partial discharge test
III. Dielectric power factor as a function of voltage.IV. Dielectric power factor as a function of temperature
V. Heating cycle test, followed by dielectric power factor as a function of voltage and
partial discharge tests.
VI. Impulse withstand test
VII. High voltage test.
20.0 ACCEPTANCE TEST:
20.1 The sampling plan for acceptance test shall be as per IS 7098 part-II, Appendix A
20.2 The following shall constitute the acceptance test.
a) Tensile test for aluminum
b) Wrapping test for aluminum
c) Conductor resistance test
d) Test for thickness of insulation
e) Test for thickness of inner and other sheathf) Hot-set test for insulation
g) Tensile strength and elongation at break test for insulation and outer sheath.
h) Partial discharge test (on full drum length).
i) High voltage test.
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
32/74
withstand rough handling during transport by rail, Roads etc., The packing should
withstand storage conditional in open yards. The cable drums shall conform to IS 10418
1982 or equivalent standard.
22.2 The drawings of the cable drums with full detail shall be furnished, and got approvedbefore dispatch.
23.0 SEALING OF CABLE ENDS ON DRUMS :
23.1 The cable ends shall be sealed properly so that Ingress of moisture is completely
prevented. The individual core endings shall be sealed effectively with water resistant
compound applied over the core ad provided with a heat shrinkable or push-on or Tapex orcold shrinkable type cap of sufficient length with adequate cushion space so that the
conductor does not puncture the cap in case of movement of the core during unwinding or
laying. Before sealing, the semi conducting layer on the cores may be removed for about 2
mm at each end, to facilitate checking the insulation resistance from one end, without
removing the sealing cap at the other end.
23.2 The three cores should have an overall heat shrinkable or push-on or Tapex or cold
shrinkable type cap with adequate end clearance, and sufficient cushioning to prevent
puncturing of the overall sealing cap due to stretching of the cores. The sealing cap shall
have sufficient mechanical strength and shall prevent ingress of moisture into the cable.
The ends of single core cable shall also be sealed on the same lines to prevent entry of
moisture.
24.0 CABLE LENGTHS :
24.1 The cables shall be supplied in continuous lengths of 250M in case of 3 core cable withtolerance of + or 5% of drum length.
It is preferable to manufacture the cable to required lengths as required by the field
conditions to have minimum joints. The turn key contractor will furnish the required drum
lengths in advance
25.0 QUANTITY TOLERANCE
A +3% tolerance shall be allowed on the ordered quantity.
26.0 MARKING:26.1 The packed cable drum shall carry the following information, clearly painted or
stenciled
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
33/74
m) Purchase order and date
n) Address of consignee
27.0 GUARANTEED TECHNICAL PARTICULARS:
Guaranteed technical particulars of the cables to be furnished with the Bid are enclosed.
28.0 DRAWING & LITERATURE
28.1 The following shall be furnished along with the tendera) Cross sectional drawings of the cables, giving dimensional details for each size of
cable.
b) An illustrated literature on the cable, giving technical technical information, on
current ratings, cable constants, short circuit ratings, derating factors, for different
types of installation, packing date, weights and other relevant information.
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
34/74
GURANTEED TECHNICAL PARTICULARS TO BE
FURNISHED BY THE BIDDER
1. CABLESa) Manufacturer
b) Trade Name
2. Type of Cable
3. Applicable specification & Standards
4. Voltage Class
5. Whether suitable for extrusion technique is employed in the manufacture of conductorscreen
6. Whether triple extrusion technique is employed in the manufacture of conductor screen
7. Permissible voltage and frequency variation for satisfactory operation
8. Continuous Current Rating for standard conditions indicated in specifications:
c) Air (450 C Ambient)
d) In Ground (350 C)
e) In Ductf) In Trench
9. De-rating factors for various laying conditions
10. Conductor
a) Material
b) Shape of conductor
c) Nominal area of cross section
d) Number of strands per core
e) Diameter of Wire (before compacting and stranding)
f) Diameter and size of conductor
11. Conductor Screening
a) Type
b) Material
c) Nominal thickness
d) Continuos working temperature
e) Maximum allowable temperature at the termination of short circuit
12. Insulation
a) Material
b) Thickness of Insulation
c) Thickness of Insulation between cores
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
35/74
f) Current carrying capacity for continuous rating
g) Current carrying capacity for short circuit rating for 1 minutes
h) Diameter of cable over screening
i) Whether insulation screen is removable without the application of heat17. Inner Sheath
a) Material
b) Extruded
c) Minimum thickness
d) Diameter of cable over inner sheath
18. Armouring:
a) Materialb) Type of Armouring
c) Diameter of wire
d) Whether galvanized
e) Diameter of cable over Armouring
f) Current carrying capacity of Armor
19. Outer Sheath:
a) Materialb) Minimum thickness of sheath
c) Tolerance over thickness of sheath
d) Overall diameter of cable
20. Scheme for identification of cable
21. Allowable/attainable maximum conductor temperature when carrying rated current
continuously
22. Cable constants:
a) DC Resistance per core 200 C
b) AC Resistance per core at operating temperature
c) Reactance
d) Capacitance
e) Insulation Resistance at 270C
f) Loss tangent
g) Dielectric constant Maximum cable charging current at normal operating voltage
23. Factory Tests (Enumerate in detail for each type of cable)
24. Is the offered cable guaranteed to safely withstand continuous conductor temperature at
900C and also safely withstand temperature upto 1300C for a duration of one hundred
hours per year.
25 Are the offered Three core cable guaranteed to perform satisfactorily under installation
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
36/74
Section-IV
HT cable joints and terminals
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
37/74
TECHNICAL SPECIFICATIONS FOR HEAT SHRINKABLE CABLE JOINT KITS FOR
CABLE TERMINATIONS AND JOINTS
1.0 GENERAL:
1.1.
he term heat shrink refers to extruded or moulded polymeric materials which are cross linked
to develop elastic memory and supplied in expanded or deformed size or shape.
2.0 QUALIFYING EXPERIENCE:
2.1. The kits should have satisfactory performance record in India in excess of 5 years supported
with proof of customers having had satisfactory use of these kits in excess of 5 years.
3.0 HEAT SHRINKABLE MATERIAL:
3.1. The heat shrinkable material component used in the joint shall have been produced in a
systematic procedure as follows:
a) The required materials shall be mixed and extruded into the required shape and then cross-
linked by irradiation or any other appropriate chemical process. The components are then
warmed and stretched by a predetermined amount and allowed to cool in the extruded
shape. The cross-linking shall create a memory and when heated again, the same shall
come back to its original shape at which it was cross-linked. Heat shrinkable tubes can be
reduced to 30% of its expanded dimension by heating.
b) The volume resistivity of the sleeves shall be 108 ohm-cm and the dielectric constant of
around 15 to 30. The limiting temperature shall not be less than 100C for longer duration
and 250C for one minute.
4.0 TYPE TEST REPORTS:
The Joints and terminations should have been subjected to all the type tests and type test
reports not later than 5 years on the day of Bid opening shall be furnished for verification.
5.0 ELECTRICAL CLEARANCES:
The electrical clearances required for a Indoor/Outdoor termination and a straight through
joint is shall be as per standards
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
38/74
7.0 JOINT KITS:
The requirements contained in a typical joint Kit are as follows:
a) Heat shrinkable or push-on or Tapex or cold shrinkable type clear
insulating tubes
b) Stress control tubing where necessary
c) Ferrule insulating tubing for joints.
d) Conductive cable break outs for terminations, non tracking, erosion and
e) Weather resistant tubing both outer / inner
f) Non tracking erosions and weather resistant outdoor sheds in case of
terminations
g) High permittivity mastic wedge Insulating mastic.
h) Aluminum crimping lugs of ISI specification.
i) Tinned copper braids
j) Wrap around mechanical protection for joints.
k) Cleaning solvents, abrasive strips.
l) Plumbing metal.
m) Binding wire etc. adequate in quantity and dimensions to meet the service
and test conditions.
The kit shall contain a leaflet consisting of detailed installation instructions and shall be
properly packed with shelf life of over 3 years.
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
39/74
ANNEXURE - I
SPECIFICATIONS FOR MATERIAL PROPERTIES AND OTHER TECHNICAL REQUIREMENTS
FOR HEAT SHRINKABLE CABLE TERMINATIONS AND JOINTS SUITABLE FOR 11 kVSCREENED CABLES/XLPE CABLES
1.0 GENERAL:
The term heat shrink refers to extruded or moulded polymeric materials which are cross
linked to develop elastic memory and supplied in expanded or deformed size or shape. The
subsequent heating results in shrinking down to original size and shape. The manufacturer of
kits besides stating the properties of each component of the kit as indicated below and as per
the detailed specifications given in Enclosures-I(A), I(B) & I(C) should also state the source of
origin of each component viz; whether locally manufactured or imported in raw material form
and processed. The manufacturing activity carried out on each component should be stated.
Also, in case the kit is assembled with components imported from two or more foreign
suppliers, the manufacturers should give documentary proof supported by the foreign
manufacturers confirming that the kit assembled utilizing components of different suppliers are
guaranteed by them.
2.0 QUALIFYING EXPERIENCE:
The kits should have satisfactory performance record in India in excess of 5 years supported
with proof of customers having had satisfactory use of these kits in excess of 5 years.
3.0 PERFORMANCE TESTING AT CPRI or any other authorized Govt.Laboratory.
The successful contractor/bidder should undertake the testing of termination and jointing kits
at Lab in the presence of CESU Engineers as per the performance type test sequence given
below. For this purpose, the kit shall be selected by CESU Engineers in the manufacturers
premises and sealed by the Engineer before taking it to Lab.
Typical atmospheric conditions during the tests
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
Test sequence
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
40/74
Test sequence
Sl No Test Sequence Test VoltageTest results shall be as
follows
1
Impact a wedge shaped weight of 4 kg having a 90
angle with a 2 mm radius shall be dropped freely 6
times from a height of 2.0M. On to the sample. The
drops shall be distributed over the length of the joint
and at right angles to the axis of the
joint,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
.(Electricity Council Engg.C.81)
No visual damage
2AC voltage withstand
(IEC Pub 60)1 min 35 kV
Shall withstand
satisfactorily
Indoor -75 kV
3Impulse voltage withstand
test (IEC Pub 60 & 230)
10 positive and 10
negative 1.2/50micro seconds
between each
conductor & the
grounded sheath or
screen
Outdoor95 kV
-do-
4 Load Cycling
63 cycles, 5 hrs
heating, 3hrscooling
conductor
temperature
screened : 75 C
15 kV -do-
5 Thermal short circuit
1 Sec. symmetrical
fault with sheath
temp. as per cable
Spec.
-do-
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
41/74
ENCLOSURE I (A)
MATERIAL SPECIFICATION FOR HEAT SHRINKABLE TUBING
RequirementTest Test
Method Non-TrackingTubing
StressControl
Tubing
Ferrule insulatingtubing
Clearinsulating
tubing
InnerOuter
tubing
for Joint
Tensile
Strength
ISO 37 8 N/mm
Min.
14
N/mm
Min.
10 N/mm
Min.
12 N/mm
Min.
14 MPa
Min.
Ultimate
Elongation
ISO 37 300 %
Min.
250 %
Min.
300 %
Min.
200 %
Min.
500 %
Min.
Accelerate
d Ageing
168 Hrs. at
120C
ISO 188
Tensile
Strength
ISO 37
Min.
7.5 N/mm
Min.
13
N/mm
Min.
10 N/mm
Min.
12 N/mm
Min.
14 MPa
Min.
UltimateElongation
ISO 37 200 %Min.
130 %Min.
300 %Min.
200 %Min.
300 %Min.
Thermal
Endurance
IEC 216 110 C
Min.
90 C
Min.
105 C
Min.
110 C
Min.
120 C
Min.
Electric
Strength
IEC 243 Wall Elec.
Thkn. Strn.(Normal) KV/CM
Wall Elec.
Thkn. Strn.(Normal) KV/CM
Wall Elec.
Thkn. Strn.(Normal) KV/CM
100
kV/CMMin.
3.0 100
mm. Min.
3.0 100
mm. Min.
*1.3
100 mm.
11Dynamic short circuit
(VDE 0278)63 kA -do-
12 Salt frog outdoor terminations 224 Kg/m 7.5 kV -do-
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
42/74
20 Mins at 3.25kV
Water
absorption
ISO/R 62
Procedure A
1 % Max. AFT. 14
days at (23 2)C
1 % Max.
AFT. 14
days at
(23 2)
C
1 % Max. AFT. 14
days at (23 2)C
0.5 % Max. AFT.
14 days at (23
2) C
0.2 %
Max. AFT.
14 days at
(23 2)
C
Resistance
to liquids ISO 1817
Transformer
oil to VDE
0370
immersion
& days at
(23 2)C
Tensile
StrengthISO 37
5 N/mm
Min.
13
N/mm
Min.
7.5 N/mm
Min.
- 14 MPa
Min.
-Ultimate
Elongation ISO 37
250 %
Min.
250 %
Min.
250 %
Min.
- 300 %
Min.
MATERIAL SPECIFICATION FOR HEAT SHRINKABLE MOULDED PARTS
Requirement
Sl No Test Test Method
Sheds Conductive Break-outs
1 Tensile Strength ISO 37 8 N/mm 9 N/mm
2 Ultimate Elongation ISO 37 300 % Minimum. 230%
3Accelerated Ageing
168 Hrs. at 120CISO 188
4 T il St th ISO 37 7 5 N/ Mi i9 N/mm
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
43/74
ENCLOSURE- I(C)
MATERIAL SPECIFICATION FOR HEAT SHRINKABLE ADHESIVE/SEALANTS
Requirement
Test Test Method
Black Insulator Mastic Sealant break-out and sheds
Softening
PointASTM E28 (115 10) C
Electric
StrengthIEC 243 130 kV/CM Min. 80 kV/CM Min.
Volume
resistivityIEC 93
1 10 OHM-CM
9 Dielectric constant IEC 250 5.0 Maximum. -
10Tracking and erosionresistance
ASTM D2303
No tracking erosion to top
surface or flame failure after:
1 HR at 2.5 kV1 HR at 2.75 kV
1 HR at 3.0 kV
20 Mins. at 3.25 kV
-
11 Water absorption ISO/R 62 Procedure A1 % Max. AFTER. 14 days at
(23 2) C
1 % Max. AFTER. 14
days at (23 2)C
12 Resistance to liquids ISO 1817
13Transformer oil to VDE 0370 immersion & days at (23 2)
C
Tensile Strength ISO 37 5 N/mm Minimum.7.5 N/mm
Minimum.14
Ultimate Elongation ISO 37250 %
Minimum.
150 %
Minimum.
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
44/74
at 121 C
Adhesive peel
strength
substrate 2/1
as detailed
in master
Spec.- Below- 30 C
NTR/ NTR 25N/25 mm Min.
NTR/ CON 20N/25 mm Min.
NTR/ AL 20N/25 mm Min.
NTR/ Pb 20N/25 mm Min.
T.E.R.TASTM
D2303 -
No tracking erosion to top surface or
flame failure after :
1 HR at 2.0 kV1 HR at 2.5 kV
1 HR at 2.75 kV
ANNEXURE I(D)
CLASSIFICATION OF SOIL STRATA
1.00 Ordinary Soil:
This shall comprise of vegetable or organic soil, turf, sand, sandy soil, silt, loam, clay, mud, red
earth, suade, peat, black cotton soil, soft shale, loose murrum, mud debris, concrete below
ground level, a mixture of all these and similar material which yields to the ordinary application
of pick shovel rake or other ordinary digging implement Removal of gravel or any other
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
45/74
4) Macadam surfaces such as water bound and bitumen/tar bound.
5) Lime concrete, stone masonry in lime/cement mortar below ground level.
6) Soft conglomerate, where the stones may be detached from the matrix with picks.
7) Generally any material which requires the close application of picks or sacrifiers to
loosen and not affording resistance to digging greater than hardest of any soil
mentioned in item (1) to (6) above.
3.00 Ordinary Rock:
1) Ordinary rock comprising of lime stone, sand stone, hard laterite, fissured rock,conglomerate or other soft or disintegrated rock which may be quarried or split with
crow bars.
2) Unreinforced cement concrete which may be broken up with crow bars or picks and
stone masonry in cement mortar below ground level.
3) Boulders which do not require blasting having maximum diameter in any direction of
more than 300 mm found lying loose on the surface or embedded in river bed, soil,
talus slope wash and terrace material of dissimilar origin.NOTE : Hard laterite does not require blasting. It is to be classified under
ordinary rock which does not require blasting.
4.00 Hard Rock:
This shall comprise:
1) Any rock or cement concrete or RCC for the excavation of which the use of mechanical
plant or blasting is required.
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
46/74
CABLE LAYING
1.0. Notwithstanding anything stated in these specifications, CESU reserves the right to assess
the bidders capability to fulfill the scope of the bid, should the circumstances warrant such
assessment.
2 0 DESIGN WORKMANSHIP AND INTERPRETATION OF CLAUSES :
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
2 3 The goods s pplied shall be s ch that components accessories of the same t pe shall
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
47/74
2.3 The goods supplied shall be such that components, accessories of the same type shall
be interchangeable. Likewise similar or corresponding parts, components / accessories
shall also be interchangeable.
2.4 Wherever and whenever a material or article is specified or described by the name of a
particular brand, manufacturer, vendor, the specific item mentioned shall be understood
as establishing type, function, quality and not as limiting competition. However bidders
may offer other similar components / accessories provided they meet with the required
standards, design, duties and performance.
2.5 Goods and accessories so offered shall conform to type test and shall also be subjected
to acceptance and routine tests in accordance with the requirements stipulated in this
specification. The CESU reserves the right for repeating any or all of the type tests to be
conducted on the goods supplied.
3.0. STANDARDS3.1. Except as modified by this specification all materials to be supplied shall conform to the
requirements of the latest editions of the following standards:
a) IS 1255 Code of practice for Installation and maintenance of power cables up to
33kV and including 11 KV rating
b) IS 7098 (Part 2 ) Cross linked Polyethylene PVC sheathed cables.
c) IEC 332 Tests on erected cables
d) IEC 1329 Allied steel, tubes, tubular and other rough iron fittings.
e) IEC 2629 Recommended practice for hot dip galvanizing of iron & steel.
f) ASTM-D : 2671 Standard method of testing heat shrinkable or push on Tapex or
cold type tubing for electrical use.
g) ASTM-D 3111 Flexibility determination of hot melt adhesives by mandrel bend testmethod.
h) IEC 60 High Voltage test
i) IS 3043 Code of practice for Earthing
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
4 3 Deviation in specification shall if possible be quoted with reference to standards The
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
48/74
4.3. Deviation in specification shall if possible be quoted with reference to standards. The
bidder shall then furnish an authentic English version of such standards.
5.0. LOCAL CONDITIONS :
5.1. It will be imperative on each bidder to fully inform himself of the local conditions and
factors which may have any effect on the execution of the supply and services covered
under these documents and specification.
5.2. It shall be understood and agreed that such factors will have been properly investigated
and considered in any bid that is submitted. The purchaser will entertain no claim for
financial adjustment to the contract awarded under these specifications and
documents. No change in the time schedule of the contract, or any financial
adjustment arising thereof that are based on incorrect information, or its effect on the
cost of the contract to the bidder shall be permitted by the Purchaser.
5.3. Bidders are advised to visit the various areas where the U.G. cables are access, road
/drain / footpath crossings to enable them to make proper costing and then quote
accordingly.
6.0. DETAILS OF WORK :
a) The scope of work involves Supply and laying, testing and commissioning of 11KV,
3 Core, 400 Sq.mm XLPE UG cable.
b) Laying of 3 core, 11 kV, 400 sq mm UG Cables by trenchless technology adopting
horizontal Boring (HDD) by machines with adequate drawing capacity.
6.1. The contract will be on the turnkey basis and all the required materials as per
specifications are to be procured by the contractor himself. The specifications for the
major equipment to be procured are as follows :
a) XLPE Cables of above size as per specifications enclosed.
b) Cable jointing termination and straight through kits as per specifications enclosed.
6.2. All the other materials like coarse and fine aggregate sand, joint markers, sealing,
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
tropical conditions where moderately hot and humid conditions conducive to dust rust
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
49/74
tropical conditions, where moderately hot and humid conditions conducive to dust, rust
and fungi growth, prevail at site.
7.3. The underground cables are to be laid along Ring Road of Kathajodi River, where other
utility services like telephone,EHT lines and PHD lines are encountered.
8.0. CLIMATIC CONDITIONS
Climatic conditionsSl No Particulars Details
1 Location Cuttack,Odisha
2 AltituteNot exceed 100 M above
MSL- Almost at the Sea level
3 Max. Ambient air temperature : 45 C
4 Max. Daily average air temp : 38 C
5 Minimum ambient air temp : 10 C (Max) 5 C (Min)
6 Ground temperature at depth of laying assumed : 35 C (Max)
7 Isoceraunic level : 458 Avg. annual rainfall : 1450 mm
9 Avg. number of rainy days per annum 60
10 Climate :
The climate in the city of
Cuttack is Tropical moderately
hot and humid. sub- soil water
at certain location at depth of
burial of cables may beanticipated .
11 Soil : Normally wet
9.0. COMPLIANCE WITH REGULATIONS :
9.1. All services carried out by the bidder / sub contractor shall be as per the requirements
of the I.E.Act-2003 & Indian electricity Rules 1956, OERC and all other applicable
statutory laws governing the services in the state of Odisha
9.2. Particular attention is drawn to the necessity of consulting the local authorities and the
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
10 1 All Electrical installations and equipments are to be inspected and approved by the
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
50/74
10.1. All Electrical installations and equipments are to be inspected and approved by the
Chief Electrical Inspector to the Government of Odisha, before commissioning.
10.2. The Contractor will arrange for the payment of the necessary fees for inspection.
10.3. Any defects pointed out by the Electrical Inspector, shall be corrected or attended by
the bidder /subcontractor at his own cost and he shall pay, for subsequent inspection
charges to the Electrical Inspector, for obtaining approval.
11.0. INSTALLATION OF U.G. CABLES
11.1. Method Of Ug Cable Laying : Laying 11 kV HT UG cables at a depth not more than
3 Mtrs, by trenchless technology ,adopting horizontal boring using appropriate standard
machines. Boring & Drawing of cable including preparation at site
11.2. ROUTE PLANS: Tentative cable route plans will be furnished to the contractors,
indicating the roads road crossings, findings by excavating trial holes by the contractor /
sub contractor. The work should be taken upon only after CESU Engineers approve
the final route. The CESU reserves the right to change, alter deviate the route on
technical reasons.
11.3. TRIAL PITS : The bidder shall excavate trial pits, for alignment purpose at
appropriate distance apart as warranted by the local conditions, keep a record of the
findings and close the trial holes properly to avoid hindrance / accidents to pedestrian
traffic. The final route / alignment of the cables shall be decided based on the finding of
the trial holes.11.4. It is the responsibility of the bidder to maintain as far as possible the required statutory
clearances from other utility services.
11.5. Any damage caused, inadvertently to any utility services shall be the sole responsibility
of the contractor.
12.0. STATUTORY NOTICES AND WAY LEAVES
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
The cable shall be pulled / drawn smoothly in the bored holes by the horizontal boring
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
51/74
e cab e s a be pu ed / d a s oot y t e bo ed o es by t e o o ta bo g
machine itself.The excavated cable trench shall be drained of all water and bedsurface shall be smooth, uniform and fairly hard before laying out the cable. The
cable shall be pulled in the trench only on cable rollers spaced out at uniform
intervals to prevent damage to cable. The laying out process shall be smooth and
steady, without subjecting the cable abnormal tension. The cable laid out shall be
smoothly and evenly transferred to the ground after providing sand cushion and shall
never be dropped. All the snake bends in the cable shall be straightened out.
14.2. Loop Cable : One complete loop of the cable has to be kept at each
termination point.
15.0. FLAKING
15.1. Wherever it is not possible to lay of the entire cable drum length, the cable should be
cut and properly sealed and if it is necessary to remove the cable from the drum, it
should be properly flaked. Such cable lengths should be properly stored at site.16.0. CABLES AND OVER BRIDGES :
16.1. Wherever the cable route crosses bridges the cable shall be laid in the ducts, if provided,
by removing and replacing the R.C.C. covers and filled with sand cushion.16.2. In the absence of the cable ducts over bridges, the cable shall be laid in suitable size
steel/G.I. pipes or as directed by the engineer-In-charge and the pipe covered by cement
concrete if necessary to protect from direct sunrays.
17.0. CABLE CROSSING OPEN DRAINS WITH LONG SPAN :
17.1. Wherever the cable to cross open drains with a long span, the cable shall be laid insuitable size G.I. pipe, properly jointed with suitable collars. The GI pipe shall be firmly
supported on pillars, columns, or suitable support of R.C.C. foundation with stone masonry
in cement mortar 1:4
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
52/74
18.1. Permanent means of indicating the positions of joints on site should be provided. During
the course of permanent reinstatement cable and joint markers, should be laid directly
above the route of the cable and the position of the joint respectively.18.2. Wherever it is not possible to place the marker directly over the cable route or joint the
marker should be suitably placed near the cable route or joint on which the distance of the
cable route or joint at right angles to and parallel to the marker should be clearly indicated.18.3. The position of fixing the markers will be at the discretion of the Engineer-In-charge.
19.0. JOINTING OF CABLES
19.1. GENERAL: It shall be noted that the U.G. cables are of XLPE insulation and needs
special care in jointing. The cable jointer and his assistant shall have experience in
making joints / terminations. Jointing work should commence as soon as two or three
lengths of cables have been laid. All care should be taken to protect the factory-plumbedcap/seal by laying the end solid in bitumen until such time as the jointing is commenced.
19.2. Jointing of cables in carriage ways, drives, under costly paving, under concrete or asphalt
surfaces and in proximity to telephone cables and water mains, should be avoided
whenever possible.19.3. JOINT PITS: The joint pits should be sufficient dimensions as to allow jointers to work with
as much freedom of movement and comfort as cables proposed to be jointed. The sides
of the pit should be draped with tarpaulin sheet to prevent loose earth from falling on the
joint during the course of making. The pit should be well shored with timber, if necessary.
An overlap of about 1.0 mtr of the cables to be jointed may be kept, for allowance to
adjust the position of the joint. When two or more cables are laid together the joints shall
be arranged to be staggered by 2 to 2.5 mtr.19.4. SUMP PITS: When jointing cables in water logged ground or under monsoon conditions,
a sump pit should be excavated at one end of the joint pit in such a position so that the
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
2.5/5 kV shall be used. The Insulation Resistance values, between phases and phase to
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
53/74
earth shall be recorded. The actual jointing operation shall start only after the approval of
the engineer in charge of works.
19.7. PRECAUTIONS BEFORE MAKING A JOINT OR CUTTING A CABLE.The cable end seals should not be opened until all necessary precautions have been
taken to prevent circumstances arising out of rainy/inclement weather conditions, which
might become uncontrollable. The cable seals should be examined to ascertain if they are
intact and also that the cable ends are not damaged, if the seals are found broken or thelead sheath punctured, the cable ends should not be jointed until after due examination
and testing by the engineer-in-charge of the works.
19.8. PRECAUTIONS TO BE TAKEN ON LIVE CABLES IN SERVICE
Sometimes it becomes necessary that a H.V. cable, which is in service, be cut for making
a straight joint with a new cable. In such cases work on joint should start only after the in
service cable is properly identified, isolated, discharged, tested and effectively earthed.
Search coils interrupters or cable-identifying instruments should be used for this purpose.
19.9. IDENTIFICATION NUMBERS / COLOURS AND PHASING : The cables should be laid
and jointed number to number or colour to colour shown on the core identifying marks and
prevent cross jointing. In all cases, the cables should be tested and phased out, andmore particularly so when the cable terminates at Ring Main Unit / Sub-station.
19.10.MAKING A JOINT: The Heat shrinkable joints used shall be conforming to the
specification vide Sec-iv. Alternatively push-on or Tapex or cold shrinkable type can be
used with the approval of CESU. The contractor should furnish all the technical
particulars of these joints and obtain approval only in case they are found superior to the
heat shrinkable joints. Epoxy based joints are not permitted. Comprehensive jointing
instructions obtained from the manufacturer of joint kits shall be meticulously followed.
The connection of the earth wires should be done using flexible bonds connected to cable
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
(3) Or a combination of the above
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
54/74
The transition joints shall conform to IS 13705 Transition joints for cables for
working voltages from 11 KV upto and including 33 KV performance
requirements and type tests.
19.12.CABLE TERMINATIONS: Cable terminations required are both indoor and outdoor type
and invariably be of heat shrinkable type conforming to the specifications vide Sec-iv. .
Alternatively push-on or Tapex or cold shrinkable type can be used with the approval of
CESU with appropriate sheds for rainwater in case of outdoor terminations. All the
technical particulars to establish the superiority in the performance of these joints shall be
furnished while seeking approval. The terminations shall conform to specifications as per
IS 13573 1992. The instructions furnished by the manufacturer of termination boxes/kits
should strictly be followed.
19.13. Whenever a cable raised from the trench to end in termination, to be finally connected to
an overhead line or transformer, the following instructions should be complied with
(i) One coil to made and left in the ground for future needs
(ii) The rise of cable, immediately from the ground level should be enclosed in
suitable diameter GI pipe to height of 2 mt.
(iii) The balance portion of the cable should be neatly curved, in S shape.
(iv) The cable and pipe should be properly fastened by using appropriate clamps
/support. The hardware of clamps shall be painted with red oxide and
enamel paint or galvanized.
(v) The lugs on the termination shall be compressed with a suitable compression
tool.
20.0. EARTHING AND BONDING
20.1. The metal sheath and Armour should be efficiently bonded and earthed at all terminals
to earth electrodes provided. The cross sectional area of the bond shall be such that the
resistance of each bond connection shall not exceed the combined resistance of an
eq al length of the metal sheath and Armo r of the cable
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
22 0 H V TESTS
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
55/74
22.0. H.V. TESTS
22.1. After the laying and jointing work is completed, a high voltage test should be applied tothe cable to ensure that the cable has not been damaged during or after the laying
operations and there is not defect in the joining
22.2. The high voltage tests should be as per IS 1255 or as per international standards. The
H.V. testing instruments shall be brought by the turn key contractor.
23.0. TESTING AND RECORD OF CABLE CONSTANTS :
23.1. When the cable is ready, just before commissioning, the cable constants viz, the
resistance, capacitance and inductance of each conductor should be determined and
recorded, along with frequency at which the values of capacitance and inductance are
determined.
24.0. GUARANTEE24.1. All the cable joints / termination done by the contractor shall be guaranteed for 12
months from the date of energisation of the complete cable. In the event of failure during
the guarantee period, the restoration work shall be done free of cost by the contractor
within 24 hours of giving notice or else the expenditure incurred by CESU to re-do the
joint / termination will be recovered from the performance guarantee amount held with
the CESU.
25.0.CABLE RECORDS25.1. Accurate neat plans / sketches, drawn to suitable scale (1 cm = 10M) should be
prepared and furnished by the contractor after the completion of each work.
25.2. All relevant information should be collected at site, during the progress of work and
preserved for preparation of drawings.
25.3. The following essential data should be incorporated on all drawings
a) Size, type of cable or cables.
b) Location of the cable in relation to prominent land mark property, Kerb-line etc., with
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
Two transparencies and six blue print copies of the cable records prepared as above shall begiven to the CESUs engineer as a part of the contract as soon as the cable is charged
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
56/74
given to the CESU s engineer as a part of the contract as soon as the cable is charged.
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
57/74
TECHNICAL SPECIFICATION OF 11 KV LIGHTNING ARRESTOR
(VOLTAGE CLASS SURGE ARRESTORS)
The specification covers the design, manufacture, shop & laboratory testing before
despatch, supply delivery of 11 KV, Station class heavy duty, gapless metal oxide Surge
Arrestors, insulating base, clamps, complete fittings & accessories suitable for 33 KV
transformers/feeders including arrester's electrode earthing.
1.0 STANDARDS
The design, manufacture and performance of Surge Arrestors shall comply with IS: 3070
Part-3 and other specific requirement stipulated in the specification Unless otherwise
Tender Specification for Technical Requirements of 11kV Line Ayakara Bhawan / CESU / Odisha
IS:4759-1996 : Specification for hot dip zinc coating on Structural Steeland other allied products
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
58/74
and other allied products.
IS: 5621-1980 : Hollow Insulators for use in Electrical Equipment.
IS: 6209-1982 : Methods of Partial discharge measurement.
IS: 6745-1980 : Methods for determination of mass of zinc coating onzinc coated iron and steel articles.
IEC:TC-37 : Test Procedures.
ANSI/IEEE-C.62.11(1982):
Metal Oxide, Surge Arrestor for A.C. Power Circuits.
IEE-99-4 : Surge Arrestors.
The equipment complying with any other internationally accepted standards shall also be
considered if it ensures performance equivalent to or superior to the India Standards.
2.0 GENERAL REQUIREMENT
2.1 The Metal Oxide gap less Surge Arrestor without any series or shunt gap shall be suitable for
protection of UG cable, associated equipment from voltage surges resulting from natural
disturbance like lightening as well as system disturbances.
2.2 The surge arrestor shall draw negligible current at operating voltage and at the same time
offer least resistance during the flow of surge current.
2.3 The surge arrestor shall consist of non-linear resistor elements placed in series and housed
in electrical grade porcelain housing/silicon polymeric of specified creepage distance.
2.4 The assembly shall be hermetically sealed with suitable rubber gaskets with effective sealing
system arrangement to prevent ingress of moisture.
2.5 The surge arrestor shall be provided with line suitable for cable for vertical and horizontaltake off. The earth terminals shall be provided of suitable size. The groundside terminal of
surge arrestor shall be connected with 50x6mm- galvanized strip, one end connected to
the surge arrestor and second end to a separate ground electrode (Electrode type of
earthing). The contractor shall also recommend the procedure which shall be followed in
-
7/28/2019 Vol-II-Tech Spec Ayakara Bhawan 1
59/74
Tender Specification for