web viewdry power frequency withstand voltage. kv. 900. wet power frequency withstand voltage ......

Annex 9 – Schedules of Guaranteed CharacteristicsKENYA - UGANDA INTERCONNECTION

400 kV DOUBLE CIRCUIT – LINE (OPERATED INITIALLY AS A 220 kV OHTL)

(Revision 2)

Nile Basin Initiative – Nile Equatorial Lakes Subsidiary Action ProgramInterconnection of Electric Grids of Nile Equatorial Lakes CountriesTender Documents – Lot A: 400 kV Transmission Line for Kenya-Uganda Power Interconnection (Lessos – Uganda Border)

Table of Contents

Conductor............................................................................................................................................ 3

Steel Overhead Ground Wire..............................................................................................................4

Optic Overhead Ground Wire (OPGW)...............................................................................................5

Suspension Insulator String/Set........................................................................................................6

Tension Insulator String/Set...............................................................................................................7

Jumper Support Insulator String/Set.................................................................................................7

Transposition Suspension Insulator String/Set................................................................................8

Hardware and Fittings......................................................................................................................... 9

Suspension Clamps for Conductor....................................................................................................9

Suspension Clamps for GSW.............................................................................................................9

Suspension Clamps for OPGW..........................................................................................................9

Tension Clamps for Conductor (Full Tension)................................................................................10

Tension Clamps for GSW (Full Tension).........................................................................................10

Tension Clamps for OPGW...............................................................................................................10

Arcing Horns...................................................................................................................................... 10

Joint Sleeves (Full Tension).............................................................................................................11

Joint Boxes and Splices for OPGW.................................................................................................11

Terminations for OPGW.................................................................................................................... 11

Armour Rods for Conductor.............................................................................................................12

Armour Rods for GSW...................................................................................................................... 12

Armour Rods for OPGW.................................................................................................................... 12

Repair Sleeve for Conductor............................................................................................................13

Repair Sleeve for GSW...................................................................................................................... 13

Repair Sleeve for OPGW................................................................................................................... 13

Spacers............................................................................................................................................... 14

Vibration Dampers for Conductor....................................................................................................14

Vibration Dampers for GSW..............................................................................................................14

Vibration Dampers for OPGW...........................................................................................................15

Hold Down Weights........................................................................................................................... 15

Aviation Warning Devices................................................................................................................. 15

Part 2 : Section VI – Employer’s RequirementsAnnex 9 – Schedule of Guaranteed Characteristics, 400kV Line, rev 2 of 16


Conductor

Description Unit Requested Provided

Manufacturer

TypeAAAC

All Aluminum Alloy Conductor

Code Word FLINT

Standard ASTM B 399IEC 61089

Construction:

a) Aluminium wires No. 37b) Aluminium wire diameter mm 3.59

c) Aluminium alloy round aluminum-alloy 6201-T81

Total Sectional Area: mm2 375.5 Overall diameter: mm 25.17 Unit weight: N/m 10.15

kg/km 1028

Rated strength (ultimate tensile strength): kN 108.54 Modulus of elasticity:

Initial, minimum kN/mm2 46.2 Initial, maximum kN/mm2 55.8 Final kN/mm2 60.7

Coefficient of linear expansion: x10-6/°C 23.04 Direction of outermost layer Right (z) Every day stress N/mm2 70 Current rating at 25°C ambient: kA 790 DC resistance at 20°C: Ω/km 0.0892 Aluminium wire minimum conductivity at 20°C % IACS 52.5%



Steel Overhead Ground Wire


Manufacturer

Type GSW 70

Standard ASTM A 363IEC 60888

Material Galvanized steel Coating Zinc coating Minimum zinc coating weight

Construction No. of wires per strand 7 Nominal wire diameter 3.68 Helical form concentric left lay

Total Area: mm2 97 Overall diameter: mm 11.11 Unit weight: kg/km 595 Ultimate tensile strength (minimum): kN 88 Every day stress N/mm2 180 Galvanised steel wire minimum tensile strength N/mm2 1314 Galvanised steel wire minimum elongation in

250mm % 1.0

Galvanised steel wire minimum stress at 1% elongation N/mm2 1200



Optic Overhead Ground Wire (OPGW)

Description Unit Required ProvidedProperties of optical fibers contained inside OPGW cableManufacturer

Material Silica

Index profile Single-mode NZDS

Standard ITU-T G.655

Number of fiber glass cores 96

Concentricity error at 1550m (core to cladding) μm < 1

Cladding diameter μm 125 ±1

Mode field diameter at 1550 nm (MFD) μm 8 – 11 ± 0.6

Attenuation at wave length 1550 nm dB/km < 0.25

Attenuation at wave length 1625 nm dB/km < 0.27

Chromatic dispersion at W.L. 1530 to 1565 nm ps/(nm.km) 2.0 – 6.15

Chromatic dispersion at W.L. 1565 to 1625 nm ps/(nm.km) 4.5 – 12.4

Polarization Mode Dispersion (PMD) ps/sqrt km < 0.5

Average splicing loss dB/joint 0.05

Maximum splicing loss dB/joint 0.10

Construction and properties of OPGW cableManufacturer

International Standards IEEE 1138IEC 60793

IEC 60794-4

Material of conductor Aluminum clad steel wireIEC 61232

Number and diameter of wires No./ mm

Conductor overall diameter, nominal mm 21

Tolerance of overall diameter %

Cross-section area, total mm²

Stranding direction (outer layer) Right-hand

Standard mass kg/km < 820

Rated Ultimate Tensile Strength (UTS), IEEE 1138 kN > 85

Maximum recommended load kN

Every day stress (20% UTS) N/mm2

Maximum load in worst climatic condition (40% UTS) N/mm2

Standard resistance at 20 ºC Ω/km

Minimum short circuit current capacity (0.5 sec) kA 31.5 (min. 496 kA2s)

DC resistance at 20°C Ω/km 0.15

Operating temperature ºC -30 to + 70

Minimum bending radius mm

Minimum length of conductor on drum km 4



Suspension Insulator String/SetSuspension Composite Insulator String/Set (note 1)


Applicable voltage (maximum system voltage) kV 420

Overall length of set, including all fittings mm < 4500

Creepage path per string (leakage distance) mm 8400

Dry power frequency withstand voltage kV 900

Wet power frequency withstand voltage (1 min.) kV 710

Dry lightning impulse withstand voltage kV 1060

Corona test voltage kV 290

Radio noise level, insulator set dB 45

Short circuit current capacity, any part of insulator set (0.5 sec)

kA 31.5

Mechanical failing load, single insulator string kN 1 x 120

Overall weight, single insulator string kg

Mechanical failing load, double insulator string kN 2 x 120

Overall weight, double insulator string kg

Note 1: Electrical values to be given for insulator equipped with required arcing rings.

Suspension Composite Insulator (note 1)


Manufacturer

TypeLong rod, composite

ANSI Class or IEC C29.11/ C29.12

Material, weathersheds and housing Material, core

silicone rubberFRP (fiberglass

reinforced plastic)

Grading rings Applied, line end and ground end

Overall length mm < 3900

No. of sheds (large/ small) /

Ball and socket size (IEC 60120) mm

Weight kg

Arcing gap mm 3300

Creepage path (leakage distance) mm 8400

Mechanical failing load kN 120

Mechanical routine test load kN 60

Power frequency flashover (dry) kV 1150

Power frequency flashover (wet) kV 1050

Critical Impulse Flashover voltage, positive kV 2050

Critical Impulse Flashover voltage, negative kV 2150



Tension Insulator String/SetTension Composite Insulator String/Set (note 1)



Number of insulators per string 3

Mechanical failing load kN 3 x 120









kA 31.5

Overall weight, complete insulator string kg


Tension Composite Insulator (note 1)


Manufacturer

TypeLong rod, composite

ANSI Class or IEC C29.11/ C29.12

Material, weathersheds and housing Material, core

silicone rubberFRP (fiberglass

reinforced plastic)

Grading rings Applied, line end and ground end

Overall length mm < 3900



Weight kg

Arcing gap mm 3300

Creepage path (leakage distance) mm 8400

Mechanical failing load kN 120

Mechanical routine test load kN 60

Power frequency flashover (dry) kV 1150

Power frequency flashover (wet) kV 1050

Critical Impulse Flashover voltage, positive kV 2050

Critical Impulse Flashover voltage, negative kV 2150



Jumper Support Insulator String/Set















kA 31.5



Transposition Suspension Insulator String/Set















kA 31.5





Hardware and FittingsGenerally the composition of insulator hardware shall be of that specified in the drawings, but not limited thereto, and the ultimate strength of the hardware for tension insulator strings shall be not less than 360 kN, and for single suspension and double suspension strings not less than 120 kN and 240 kN respectively.

Suspension Clamps for Conductor


Material of body Aluminium

Applied conductorFLINT

(AAAC)

Ultimate body strength kN 11.5

Armour rods Applied

Galvanising, if applicable BS 729

Suspension Clamps for GSW


Material of body Steel

Applied conductor GSW 70


Armour rods Not applicable


Suspension Clamps for OPGW



Applied conductor OPGW 96


Armour rods Applied




Tension Clamps for Conductor (Full Tension)


Type Compression

Material of body Aluminium


(AAAC)

Ultimate breaking strength kN 82.7


Tension Clamps for GSW (Full Tension)


TypeBolted or

Compression



Ultimate breaking strength kN 85


Tension Clamps for OPGW


Type Preformed dead-end



Ultimate breaking strength kN 44.7


Arcing Horns


Type


Mechanical load withstand kN 1.5




Joint Sleeves (Full Tension)


For conductor tensile strength kN 82.7

For GSW tensile strength kN 85

Joint Boxes and Splices for OPGW


Optical losses dBNo more than 0.1 db

per splice, average 0.05 db

Terminations for OPGW


Optical losses dBNo more than 0.1 db

per splice, average 0.05 db



Armour Rods for Conductor


Type Helical preformed

Material Aluminium alloy


(AAAC)

Colour code

Rod diameter mm

Direction of lay

Length mm

Number of rods No

Armour Rods for GSW




Applied conductor GSW

Colour code

Rod diameter mm

Direction of lay

Length mm

Number of rods No

Armour Rods for OPGW



MaterialAnti-corrosion

Aluminium alloy


Colour code

Rod diameter mm

Direction of lay

Length mm

Number of rods No



Repair Sleeve for Conductor


Type Compression



(AAAC)

Length mm

Repair Sleeve for GSW


Type Compression


Applied conductor GSW

Length mm

Repair Sleeve for OPGW



MaterialAnti-corrosion

Aluminium alloy


Length mm



Spacers


Type Cushion - grip Material of body Aluminium/ rubber


(AAAC) Thermal rating (continuous) °C 125 Slip strength kN 12.3 Galvanising, if applicable BS 729

Vibration Dampers for Conductor


Type Clamp-grip Material of body Galvanized Steel


(AAAC) Thermal rating (continuous) 125 Slip strength Galvanising, if applicable BS 729

Vibration Dampers for GSW


Type Clamp-grip Material of body Galvanized Steel Applied conductor GSW 70 Thermal rating (continuous) 125 Slip strength Galvanising, if applicable BS 729



Vibration Dampers for OPGW


Type Clamp-grip Material of body Aluminium alloy Applied conductor OPGW 96 Thermal rating (continuous) 125 Slip strength Galvanising, if applicable BS 729

Hold Down Weights


Type

Material of bodyCast iron hot dip

galvanized


(AAAC)


Aviation Warning Devices


Type

Day marking sphere approved by ICAO

and CAA

Material of sphereFibre reinforced polyester (FRP)

Material of clamp Aluminium/steel

Diameter mm 600

Colour code


Colour of sphere White/red

Fade resistant kN 6.4

Slip strength No

