RE MG RIIS F TE DRE

N C .N D E R W R I T E R S A B O R A T O R I E SU L I

UL®

UL®

Pragati ElectricalsPrivate LimitedR - 230, TTC, MIDC Industrial AreaRabaleNavi Mumbai - 400 701INDIAUnderwriters Laboratories Inc.® (UL) issues this certificate to the Firm named above, after assessingthe Firm’s quality system and finding it in compliance with

ISO 9001:2000EN ISO 9001:2000; BS EN ISO 9001:2000; ANSI/ASQ Q9001:2000

The Design & Development and Manufacture of Instrument Transformers andSpecialty Transformers for Industrial Applications.

Further clarifications regarding the scope of this certificate and the applicability of ISO9001:2000 requirements may be obtained by consulting the organization.

This quality system registration is included in UL’s Directory of Registered Firms and applies to theprovision of goods and/or services as specified in the scope of registration from the address(es)shown above. By issuance of this certificate the firm represents that it will maintain its registration inaccordance with the applicable requirements. This certificate is not transferable and remains theproperty of Underwriters Laboratories Inc. ® .

3612 (US) : Power, Distribution and Specialty Transformers

nd280/3, 2 Pokhran Road,Thane - 400 610INDIA

John H. SchmidtSenior Vice President, Chief Development Officer

File Number: A12604 Volume: 1Original Certificate Date: October 13, 2003ISO 9001:2000 Issue Date: October 13, 2003Revision Date: September 19, 2006Recertification Date: October 13, 2006Renewal Date: October 12, 2009

for the following scope of registration

INDOOR CURRENT TRANSFORMERS...........................................08-12

INDOOR VOLTAGE TRANSFORMERS............................................13-17

LOW TENSION INSTRUMENT TRANSFORMERS..........................24-25

H. V. TESTER.....................................................................................26-27

BUS DUCT CURRENT TRANSFORMERS............................................18

OUTDOOR OIL COOL CURRENT TRANSFORMERS.....................21-22

NEUTRAL GROUNDING TRANSFORMERS.........................................23

GENERAL INFORMATION.....................................................................07

INDOOR AND OUTDOOR METERING CUBICLES...............................28

OUTDOOR OIL COOL CURRENT TRANSFORMERS.....................19-20

6

Pragati Electricals Pvt. Ltd. was established

in 1975, by electrical engineers having rich

experience in the field of design and

manufacturing of instrument transformers.

During the last 25 years, the company has,

with in-house technology, developed, many

products as per the requirements of the indoor

Switchgear industry and conforming to Indian

and International standards.

PRAGATI is one of the leading manufacturers of

Epoxy Resin Cast Indoor medium voltage

Instrument Transformers and oil cooled

Transformers upto 132 kV in India. They are

manufactured in two modern factories, one at

Thane and another at Navi Mumbai.

Qualified and experienced engineers are working in sales, Design, Production & Testing.Products are type tested at recognized

institutes such as CPRI / ERDA etc.

PRAGATI - the name stands for a whole range of

products, high product quality and short delivery

periods.

PRAGATI’s major customers in India include

Switchgear manufacturers such as Siemens,

ABB, BHEL, Altome, and power utilities Such as

Tata Power, CESC, BSES, BEST etc.

! Epoxy Resin Cast - Indoor - Current & Voltage transformers upto 33kV.

Range : All types upto and including 33kV in three main types such as Wound-Primary, Bar-Primary and window type.

! High Current Ring type Current Transformers Range : Upto 20,000A (22kV system voltage for Generator Bus-ducts).

! High Current CTs with split core arrangement for furnace duty.

Range : Upto 60,000A

! All types of Low Voltage Current & Voltage Trans fo r mers ( I ndoo r & Ou tdoo r ) , Summation Current Transformers and Core balance Current Transformers.

! Epoxy Resin Cast Coil, Dry Type Transformers upto 22kV & 250kVA for applications such as neutral grounding transformer, Earthing transformers, Control transformers etc.

! DC Current & Voltage transformers upto 50,000A and 3000 Volts.

! High Voltage Tester (HVT) from 2.5kV to 300kV.

! Outdoor Oil Cooled Current & Voltage Transformer.

Range : All types upto & including 132kV in Live Tank & Dead Tank for Current Transformers & Dead Tank for Voltage Transformer.

! Outdoor Combined CT VT unit upto 33kV and Residual voltage Transformer upto 33kV.

! Indoor & Outdoor metering cubicles upto 33kV.

! Special Designs : The company undertakes design and development of any type of instrument transformers upto 36kV system voltage, tailor-made to suit the special electrical and dimensional specification required by the customer.

Standards : IS, IEC, ANSI, BS, DIN

7

1 2 3 4 5 6 7 8 9 10 11 12 13

14 15 16 17 18 19 20 21 22 23 24 25 26

27 28

849

16

LCLC

230±2300±2

50

225±1

290±1

265±2

Rating Plate

2

(1a) (dn)(2a)(1n)

38

dnda

28

95

na

2

5

300±5

365±2

195±2

A

4, MountingHoles Ø14

Earthing Terminal

M.S. Mounting Plate zinc passivated

M.S. M8

Sec. Terminals See details at X

Pri. Terminal Bolt

Brass M10 x 20 mm Long

with Nickel plated

Details at 'X'

Sec. Terminals

Brass M5 x 15 mm

with Nickel plated

Neutral Pri. Terminal (N)

20

50 Computerized drawing hence not signed.Note.

OUTDOOR-OIL COOLED INSTRUMENT TRANSFORMERS

PRAGATI ELECTRICALS PVT. LTD.

132

132

Max

2585

+ -

50

mm

19

PRAGATI ELECTRICALS PVT. LTD.

OUTDOOR-OIL COOLED INSTRUMENT TRANSFORMERS

33 kV C.T. 132 kV C.T.66 kV C.T.

20

PRAGATI ELECTRICALS PVT. LTD.

OUTDOOR-OIL COOLED INSTRUMENT TRANSFORMERSM

ax

132

132

2560

+ -

mm

21

PRAGATI ELECTRICALS PVT. LTD.

OUTDOOR-OIL COOLED INSTRUMENT TRANSFORMERS

132 kV V.T.

33 kV V.T. 66 kV V.T.

33 kV C.T./V.T. Combined Unit

22

PRAGATI manufactures all type of Indoor / Outdoor low tension current and voltage transformers and have supplied large nos. of L.T. instrument transformers from 1975 to all the major O.E.Ms. The company undertakes the design and development of all types of LT current transformers and voltage transformers to suit the special electrical and dimensional specification required by the customer.

Types of Low Tension Indoor CTs :1. Tape wound Ring type current transformers

with / without mounting arrangement.2. Tape wound / Resin cast, wound primary

current transformers (WPL).3. Resin cast Bar Primary Current

Transformers.4. Bushing Cts.5. Universal Auxiliary Transformer

(Multi Ratio CT).6. Interposing Current Transformer.

Types of Low Tension Indoor VTs :1. Tape wound / Resin cast voltage

Transformer.2. Interposing Voltage Transformer.3. Isolation Voltage Transformer.

Special Purpose Low Tension Indoor CTs and VTs :1. Summation Current Transformer.2. Core balance Current Transformer (for earth

fault protection).3. Precision Grade CTs and VTs.4. Furnace Current Transformers (Split core

Type).5. D.C. Current Transformer for measurement

purpose.

Types of Low Tension Outdoor Cts :1. Cycloeliphatic resin cast wound primary Cts for metering and protection.2. Cycloeliphatic resin cast bar primary CTs for metering and protection.

Tape Insulated Cts

Voltage Transformers

Windows Ct’s

LOW TENSION INSTRUMENT TRANSFORMER

24

LOW TENSION INSTRUMENT TRANSFORMER

SUMMATION CURRENT TRANSFORMERS :Summation current Transformers are in association with feeder current Transformers which may not have the same ratio. Each feeder is provided with its own current transformer, and their secondary windings are connected to the appropriate primary winding of the summation current transformer. The summation current transformer has a single secondary winding which is connected to the burden. It is essential that the summation current transformersare used on the currents of the same frequency and phase.

CORE BALANCE CURRENT TRANSFORMER: ( CBCT ).The core balance current transformers are used for sensitive earth fault protection. Generally it is sufficient to incorporate insulation monitoring for signaling appearance of earth faults. The operating staff in such cases will be able to take the measures to switch the load over to other feeders and switch out the fault circuits for repairs.

INTERPOSING CURRENT TRANSFORMERS :A current transformer which is intended to amend the ratio of a main transformer by having its primary winding connected to the secondary winding of the main transformer and its secondary winding connected to the burden.

APPLICATION OF SOME SPECIAL PURPOSE CURRENT TRANSFORMERS.

Windows Ct’s

Windows Ct’s

Core Balance Ct’s

Window type C.T.’s

Busbar type C.T.’s

Summation / Auxiliary C.T.

Window type Ct’s Summation C. T.

Core Balance C.T.

25

INTRODUCTION

Every electrical apparatus or machine is provided with insulation between live part and earth or between two different sections of live parts. This insulation is required to be tested at high voltage values recommended by applicable relevant standards.

The standard specification for various electrical apparatus specifies Power Frequency Voltage withstand test at different levels depending upon working voltage of electrical apparatus. It is observed from the various standards for electrical equipments that the minimum power frequency voltage withstand test level for electrical insulation is 3kV for one minute.

We have, therefore, standardized on manufacture of Pragati High Voltage Breakdown Testers with rated voltage of 5kV.

High Voltage Test Sets of higher voltage upto 300kV are also manufactured against specific requirement. The standard voltages are 10kV, 15kV, 20kV, 25kV, 30kV, 50kV, 100kV, 150kV, 200kV & 300kV. The test sets upto 30kV are manufactured in Air Cooled design while the sets of 50kV & above are manufactured in Oil Cooled design. The output of these high voltage testers is single phase 50/60Hz. The standard H. T. current rating of air-cooled design as also of oil cooled design upto 150kV is 100mA for 30 minutes. For voltage ranges above 150kV the H. T. current is 100mA for 30 minutes.

CONSTRUCTION

Pragati make 5kV A.C. (With 2.5kV tap) High Voltage Breakdown Tester is portable, sturdy & plug in to start type construction & requires minimum table space. It broadly consists of 3

main sections1. High Voltage Transformer2. Variable Voltage Source3. Control Circuit

1. High Voltage Transformers:The High Voltage transformer is single phase, single pole type & is of double wound resin moulded construction. TheH. T. winding is provided with graded insulation such that one end is insulated for 3kV insulation and is earthed through a c u r r e n t s e n s i n g t r a n s f o r m e r s & mi l l iammeter whereas other end is insulated for rated voltage & the same brought out through H. T. cable & spring loaded Prod.

2. Variable Voltage Source:Variable Voltage supply is provided through a Dimmerstat (Variable auto-transformer) having a suitable rating corresponding to the rating of H. V. transformer. Dimmerstat is rated for 230 Volts A. C. input & 0-270V output. Limit switch at zero position end of Dimmerstat winding is provided to facilitate the H. T. winding to energize only when Dimmerstat is at zero position.

3. Control Circuit & Other Features:! Manually operated control transformer

(Variable auto-transformer) with zero interlock facility.! 72mm sq. Double range (0-2.5kV/0-5kV)

moving coil rectifier type voltmeter of class 1.5, provided to read NO LOAD H. T. voltage.! 72mm sq. (0-100mA) moving coil rectifier

type A. C. milliammeter of class 1.5, provide in the earth end of the H. T. winding to read H. T. Current. ! Automatic tripping circuit is provided for

H. V. TESTER

Oil Cool High Voltage Transformers

2.5 kV - 5 kV Test Set

26

isolation of supply, in the event of failure ofthe object under test. Rotary switch with four different settings of 5, 10, 50 & 100mA is provided on front panel with LED indication.! M.C.B. for short circuit protection of H.T.

transformer & auto transformer.! H.T. ON push button, Mains ON & H.T.

transformer & auto transformer! Range selection switch to select 2.5kV or

5kV range with Led indication.! Two spring loaded test prods with 1 metre

long cable for safe & easy connection of high voltage to test object. (Upto 5kV)! Portable model with minimum table space.! Two terminals are brought out on back of H. V.

tester for connecting external delayed NC contact of timer.

H. V. TESTER

1. MINIATURE CIRCUIT BREAKER2. DIMMERSTAT3. AUXILIARY TRANSFORMER4. VOLTAGE RANGE INDICATOR5. KILO VOLT METER6. RANGE SELECTOR SWITCH7. MAIN ‘NO’ LED YELLOW8. H. T. ON LED RED9. H. T. ON PUSH BUTTON10. MAIN RELAY COIL11. MAIN RELAY12. HIGH VOLTAGE TRANSFORMER13. MILLIAMMETER14. TIMER CONNECTION LINK15. TRIPPING ADJUSTMENT POT16. TRIPPING C, Tr.17. TRIPPING SELECTOR SWITCH18. TRIPPING INDICATOR19. EARTH TEST PROD BLACK20. H. T. TEST PROD RED21. D’STAT ZERO MICRO SWITCH22. RECTIFIER23. TRIPPING RELAY24. BLEEDER RESISTANCE

CIRCUIT DIAGRAM :

DIMESIONAL DRAWING :

10kV - 30kV TEST SET

500

±10

400

±5

550 ±10

260 ±5

445

±10

2.5kV - 5kV TEST SET

DIMENSIONAL DRAWING :

38

0

35

5

210335290

TEST PRODS

NOTE : DIMENSIONS MARKED THIS (’) &CONSTRUCTION ARE SUBJECT TO CHANGE IN VOLTAGE & CURRENT RATING

150kV OIL COOLED HIGH VOLTAGE TRANSFORMER

685

±6

835 ±6

1890

±50

*

80

Ø418 *Ø30

80012

00

750 800

PRIMARY TERMINAL

PRESS

EARTH

SECONDARY TERMINAL BOX

CIR

CU

IT D

IAG

RA

M F

OR

2.5

-5kV

H.V

. TE

ST

ER

ON

LY

21

24

4

14

7

15

10

kV

31

BODY OFH.V. TESTER

N

23 17

9

16 12

20

19

8

27

INDOOR AND OUT DOOR METERING CUBICLES

“Pragati” manufactures INDOOR AND OUT DOOR METERING

CUBICLES rating from 11 KV to 33 KV. The modern Plant

situated at THANE is equipped with full range of testing

equipments and Plant & machinery to manufacture Metering

Cubicles. “PRAGATI” had supplied good numbers of Metering

Cubicles (Both INDOOR & OUT DOOR) to various OEMS in the

country. These Metering Cubicles are working satisfactorily

under different service conditions at the sites.

APPLICATION: Direct measurement of CURRENT / VOLTAGE

in High voltage system is not possible because of insulation

problem of measuring instruments. It is not possible to use direct

CURRENT / VOLTAGE for the system protection purpose due to

its high value and high insulation problem of protective relays.

The Out door type Metering Cubicles are suitable to install on

structure without any Room or Shade. The cubicle is completely

Weather & Dust proof.

The INDOOR & OUTDOOR type Cubicles are Pilfer Resistant

because of its constructional features and its sealing and locking

arrangements. Also the ELECTRONICS LOCK can be provided

to METER Chamber on Special Demand.

The CTs and PTs we are using in the Metering Cubicles are our

own products. PRAGATI was established in 1975, by electrical

engineers having rich experience in the field of design and

manufacturing of Instrument Transformers.

PRAGATI is one of the leading manufacturers of EPOXY RESIN

CAST INDOOR Instrument Transformers (CTs & PTs) in India

100 102575

350350 350 440

785 14

0596

5

11

8 8

11

SECTIONAL SIDE VIEW

6

7

120

10

12

45

470 350 350 350

775 655

14301520

8

4

5

1

2

3

1685

1750

45

ELEVATION(WITHOUT OPENING)

1490

SECTIONAL PLAN

100

380380

SIDE VIEW

1490 9 3030

1314 1025

75 85.5

PADLOCKINGARRANGEMENT

LOUVERS

1750

ELEVATION

820 700

75

LOUVERS

28

YOUR PARTNERS

Mr. Vishal Borse 9867570930Mr. Hemant Gurav 9867570936Mrs. Shraddha Joshi 9867570935Mr. Gopi Nair 9867570934Mr. B.L. Phatak 9869367881Mr. G.S. Kudale 9869112295Mr. Pradeep Pawar 9820186121

vishal.borse@pragatielectricals.comhemant.gurav@pragatielectricals.comshraddha.joshi@pragatielectricals.comgopi.nair@pragatielectricals.combl.phatak@pragatielectricals.comgs.kudale@pragatielectricals.compradeep.pawar@pragatielectricals.com

DESIGN / TECHNICAL

rajesh.jathar@pragatielectricals.comsudhir.mandhare@pragatielectricals.com

Mr. Rajesh Jathar : 9867570929Mr. Sudhir Mandhare : 9867570932

National Thermal Power Corporation (NTPC)

Nepal Electricity Authority Oil- Cooled Cts / Vts Upto 36kV

N.T.P.C., N.P.C.I.L., P.G.C.I.L. Oil- Cooled Cts / Vts Upto 36kV

Suzlon Developers Ltd. Oil- Cooled Cts / Vts Upto 36kV

Tata Steel Oil- Cooled Cts / Vts Upto 36kV

Areva T&D Ltd. Oil- Cooled Cts / Vts Upto 66kV

Boving Fouress Ltd. Oil- Cooled Cts / Vts Upto 66kV

Bharat Bijlee Oil- Cooled Cts / Vts Upto 66kV