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N D E R W R I T E R S

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A B O R A T O R I E S

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Pragati Electricals Private Limitednd R - 230, TTC, MIDC 280/3, 2 Pokhran Road, Industrial Area Thane - 400 610 Rabale INDIA Navi Mumbai - 400 701 INDIAUnderwriters Laboratories Inc. (UL) issues this certificate to the Firm named above, after assessing the Firms quality system and finding it in compliance with

ISO 9001:2000for the following scope of registration

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

3612 (US) : Power, Distribution and Specialty Transformers The Design & Development and Manufacture of Instrument Transformers and Specialty Transformers for Industrial Applications.Further clarifications regarding the scope of this certificate and the applicability of ISO 9001:2000 requirements may be obtained by consulting the organization.This quality system registration is included in ULs Directory of Registered Firms and applies to the provision 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 in accordance with the applicable requirements. This certificate is not transferable and remains the property of Underwriters Laboratories Inc. .

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

UL

IS

T E RED F

John H. Schmidt Senior Vice President, Chief Development Officer

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R EG

M

UL

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

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

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

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

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

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

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

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

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

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

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Pragati Electricals Pvt. Ltd. was established in 1975, by electrical engineers having rich experience in the field of design and manufacturing of instrument transformers.

! 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.

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.

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

! High Current CTs with split core arrangementfor furnace duty. Range : Upto 60,000A

! All types of Low Voltage Current & VoltagePRAGATI 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.Tr a n s fo r m e r s ( I n d o o r & O u t d o o r ) , Summation Current Transformers and Core balance Current Transformers.

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

! DC Current & Voltage transformers uptoQualified and experienced engineers are working in sales, Design, Production & Testing. Products are type tested at recognized institutes such as CPRI / ERDA etc.50,000A and 3000 Volts.

! High Voltage Tester (HVT) from 2.5kV to300kV.

! Outdoor Oil Cooled Current & VoltageTransformer. Range : All types upto & including 132kV in Live Tank & Dead Tank for Current Transformers & Dead Tank for Voltage Transformer.

PRAGATI - the name stands for a whole range of products, high product quality and short delivery periods.

PRAGATIs major customers in India include Switchgear manufacturers such as Siemens, ABB, BHEL, Altome, and power utilities Such as Tata Power, CESC, BSES, BEST etc.

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

! Indoor & Outdoor metering cubicles upto 33kV. ! Special Designs : The company undertakesdesign 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

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1 14 27

2 15 28

3 16

4 17

5 18

6 19

7 20

8 21

9 22

10 23

11 24

12 25

13 26

849

3002 C L 2

2302 C L Pri. Terminal Bolt Brass M10 x 20 mm Long with Nickel plated

3005

Rating Plate

Sec. Terminals See details at X

Details at 'X'Sec. Terminals Brass M5 x 15 mm with Nickel plated 2

1952 3652

2652 M.S. Mounting Plate zinc passivated 4, Mounting Holes 14

5

2251

A 95

Note. Computerized drawing hence not signed.

50

Neutral Pri. Terminal (N)

50

2901

20

16

38

Earthing Terminal M.S. M8

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

28

OUTDOOR-OIL COOLED INSTRUMENT TRANSFORMERS

PRAGATI ELECTRICALS PVT. LTD.

132

2585 + - 50 mm Max

132

19

OUTDOOR-OIL COOLED INSTRUMENT TRANSFORMERS

PRAGATI ELECTRICALS PVT. LTD.

33 kV C.T.

66 kV C.T.

132 kV C.T.

20

OUTDOOR-OIL COOLED INSTRUMENT TRANSFORMERS

PRAGATI ELECTRICALS PVT. LTD.

1322560 + - mm Max

132

21

OUTDOOR-OIL COOLED INSTRUMENT TRANSFORMERS

PRAGATI ELECTRICALS PVT. LTD.

33 kV V.T.

66 kV V.T.

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

132 kV V.T.

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LOW TENSION INSTRUMENT TRANSFORMER

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 Cts

24

LOW TENSION INSTRUMENT TRANSFORMER

APPLICATION OF SOME SPECIAL PURPOSE CURRENT TRANSFORMERS. 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 transformers are 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.

Windows Cts

Windows Cts

Core Balance Cts

Summation / Auxiliary C.T.

Core Balance C.T.

Window type C.T.s

Window type Cts

Summation C. T.

Busbar type C.T.s

25

H. V. TESTER

INTRODUCTIONEvery 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 spe