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Submitted By:-

Anirudh SharmaRam Pratap Singh

SUMMER TRAINING REPORT ONKOTSONS TRANSFORMERS

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ISO 9001 :2000 Certified Company

Recognized Export House

Manufacturing Transformer Since 1979

25 years of Excellence

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ALWAR Established in 1979

AGRA Established in 1991

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Single phase transformer

Auto Transformer

Three Phase Transformer

Rectifying Transformer

Dry Type Transformer

Special Purpose Transformer

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Bangladesh Oman

Iraq Syria

Ireland UAEJordan United Kingdom

Mauritius Yemen

NepalNigeria

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NDPL, New Delhi

BSES, New Delhi Vestas RRB India Ltd. , New Delhi

NEPC Micon Ltd. , Chennai

ABB , Mumbai

Various State Electricity Board in INDIA

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LAND MARKS

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KOTSONS Firmly Pledge Allegiance

Towards the Betterment of

Product & customer Satisfaction

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1-Transformer core 2-Transformer Windings

3-Transformer Tank and Radiators.

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Cross over Type

Helical Type

Continuous Disc Type

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1. Plain sheet steel tank.

2. Sheet steel tank with external cooling tubes.

3. Radiator tanks.

4. Tanks with corrugated wall panels.

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1. Rating and terminal marking plate.

2. Tap Changing arrangement

(a) Off

circuit tap changing switch(b) Offcircuit tap changing link

(c) On Load tap changer

3. Two earthing terminals

4. Lifting Lugs

5. Draincum filter valve

6. Pressure Relief Device

7. Silicagel dehydrating breather.

Standard Fittings

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8. Oil Level Indicator.9. Thermometer Pocket.

10. Conservator with drain plug and filling

hole.

11. Air Release plug.

12. Jacking lugs (above 1600 KVA)

13. Filter valve (top tank)

14. Under base unidirectional flat rollers

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Bare Bushings

Or

Cable box.

i) Compound filled for PLC cables (upto 33000 Volts)or

ii) Air filled for PVC cable s (Upto 11000 Volts)

or

Bus Duct (Bare bushing enclosed in housing upto 600Volts)

Disconnection chamber between cable box andtransformer tank.

Additional bare neutral terminal.

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Winding temperature indicator

Oil temperature indicator

Gas and oil actuated (Buchholz)relay

Conservator drain valve Shut off valve between conservator and tank.

Magnetic oil level gauge

Explosion vent

Filter valve (Bottom of tank)

Skid under base with haulage holes

Junction box.

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Rating and Terminal marking plate

Tap changing arrangementi) Off - circuit tap changing switchII)On Load tap changer

Earthing Terminals Lifting Lugs

Valves and drain plugs

Silicagel dehydrating breather

Oil Level indicator

Thermometer Pockets Conservator with drain plug and filling hole

Jacking lugs

Air release plug

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a) Bare bushing

i) Draw through bushing (oil flood type)

ii) Solid Bushing (through stem type)

a) Outdoor through stem type porcelain bushings

b) Cable box type porcelain

bushings

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B) Cable sealing boxes

C) Bus Duct

c) Cable box type epoxy bushings.

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a) Winding temperatureIndicator

b) Oil Temperature Indicator

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c) Gas and oil actuated Buchholz relay

Magnetic Oil Gauge

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Explosion Vent

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PRE TEST INSPECTION

Sample of oil taken from the transformer and subjected to

electric test (break down value) of 50KV (RMS) as specified in

IS : 335.

Release trapped air through air release plugs and valve fittedfor the purpose on various fittings like radiators, bushing caps,

tank cover, Bushing turrets etc.

Check whether gas operated really (if provided) is mounted at

angle by placing a spirit level on the top of the relay. See thatthe conservator is filled upto the filling oil level marked on

plain oil gauge side and corresponding to the pointer reading in

MOG side. The air should be released after the tests. Make sure

that transformer oil runs through pert cock of Buchholz relay.

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Check the condition of silicagel in the breather toensure that silicagel in the

breather is active and colour is blue. Also check that

the transformer oil is filled in the silicagel breather upto the level indicated.

For transformer furnished with thermometers for bothoil and winding

temperature, the signaling contacts are recommendedto be set to operate at the following temperatures.

Alarm Trip

Oil Temperature 85 deg.C +/- 2deg.c 95 Deg.C +/-

2deg.CWinding Temp. 100Deg.C +/- 2 Deg.C 110Deg.C+/- 2 deg.C

Check all the gasketed joints to ensure that there is noleakage of transformer

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Ratio, Polarity and phase relationship

Alarm Circuits Tests

Alarm & trip circuitsa)a)Buchholz relayair injection test

b) Oil temperature indicator

alarm & trip circuits

c) Magnetic oil level gaugealarm circuits

d) Winding temperature indicatoralarm & trip circuits

Oil Sampling Test

Magnetic balance test

Magnetizing Current

Insulation Resistance

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Quality

Long life

Reliability

Manufacturing Tolerance

Design Verification

R & D

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1. Measurement of winding resistance.

2. Verification of voltage ratio.

3. Verification of vector Group.4. Measurement of no load current and losses.

5. Measurement of impedance and load losses.

6. Measurement of insulation resistance.

7. Power frequency withstand Voltage.

8. Induced over voltage test.

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1. Impulse Voltage withstand test.

2. Temperature rise test.

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Transformers are type tested at KEMA, the

Netherlands.

Manufacturing capacity upto 25 MVA, 33 KV

Manufacturing standards: IEC, BS, ANSI, IS &

DIN

Providing technical collaboration to foreign

companies.

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