Presented by:-

Suraj Kumar Talreja

Branch :-Electrical & Electronics

Roll No: 0832EX111057

INDUSTRIAL TRAINING SEMINAR

Seminar Coordinator:-

Mr. Abhishek Dubey

Contents

Outline About MPPKVVCL Co. Ltd Indore

Outline

15 days Summer Training at MPPKVV Co. Ltd, Indore .

From 12/06/2014 to 30/06/2014 at 33/11 KV.

It was a good experience. I got to see what are the processes that to be followed for transformer repairing and saw the testing of Low Tension Meter and High Tension Meter. And I also saw how electricity get transmitted from Substation to feeders.

About MPKVVCL Co. Ltd Indore

Introduction The Government of Madhya Pradesh vide

order dated 1st July, 2002 has incorporated Madhya Pradesh Paschim Kshetra Vidyut Vitaran Company Limited as a wholly owned Government of Madhya Pradesh Corporations under the Companies Act, 1956 to undertake activities of distribution and retail supply for and on behalf of Madhya Pradesh State Electricity Board in the areas covered by the Commissionaires of Indore and Ujjain.

MPPKVVCL Objectives The main objectives are to achieving

efficiency gains and making necessary changes to make the Company commercially viable, progressively self sustainable and less government dependent and at the same time, balancing the interest of the consumers in regard to quality of service and economical tariff.

The Government of Madhya Pradesh had restructured the functions and undertakings of Generation,Transmission, Distribution and Retail Supply of electricity earlier carried out by

The Madhya Pradesh State Electricity Board (‘MPSEB’ or ‘Board’) and transferred the same to five Companies to function independently. The five Companies are as under: -

(1) M.P. Power Generating Company Ltd., Jabalpur (MPPGCL) (GENCO)

(2) M.P. Power Transmission Company Ltd., Jabalpur (MPPTCL) (TRANSCO) (3) M.P. Poorv Kshetra Vidyut Vitaran Company Ltd., Jabalpur

(MPPKVVCL) (EAST DISCOM) (4) M.P. Madhya Kshetra Vidyut Vitaran Company Ltd. Bhopal

(MPMKVVCL) (CENTRAL DISCOM) (5) M.P. Paschim Kshetra Vidyut Vitaran Company Ltd.,

Indore (MPPKVVCL) (WEST DISCOM)

About Training

Whole Training is divided into Four Sections:-

MTRU(Main Transformers Repairing Unit) – 4 Days

LTMT Lab(Low Transmission Meter Testing Lab) – 4 Days

HTMT(High Transmission Meter Testing Lab) – 3 Days

33/11 KV Substation. – 4 Days

MTRU(MAIN TRANSFORMER REPAIRING UNIT)

In this Section four days training were taken place. Here, we had found how transformer got repaired

and the processes which are to be followed for repairing.

The faulty transformer is brought on a vehicle to the MTRU, from where it is placed on a suitable place with the help of a manually operated crane.

Firstly, the Transformer is opened and Transformer oil is removed

Then the Transformer is heated in Electric heater at 80ºC for 8 – 10 Days to remove the Moisture.

Then the Transformer is heated in Electric heater at 80ºC for 8 – 10 Days to remove the Moisture.

Then After this Transformer is taken out from Heater and Transformer Test is performed: Double Frequency Double Test:The object of this test is to secure that the insulation

between the phase windings, turn, coils, tapping leads and terminals withstand the temporary over voltages to which the transformer may be subjected during it’s lifetime.

Transformer Winding Resistance Test:Transformer winding resistance measurement is

carried out to calculate the I2R losses and to calculate winding temperature to check loose connections, broken strands of conductor, high contact resistance in tap changers.

Turn Ratio Test:-The performance of a transformer largely

depends upon perfection of specific turns or voltage ratio of transformer. 

We just apply three phase 415 V supply to HV winding, with keeping LV winding open. The we measure the induced voltages at HV and LV terminals of transformer to find out actual voltage ratio of transformer.

OIL TEST In this test high voltage is applied across

the oil to determine it’s dielectric strength i.e break down voltage.

SHORT CIRCUIT TESTShort circuit voltage and copper loss

calculated during this test determine the performance of the transformer

LTMT(Low tension Meter Testing) In this Section Low Tension Meter Testing

carried out, Low Tension Meter(Digital Meter) Stands for the meter which is generally used for Domestic and Industries purpose which is under the range of 220-400 V.

Instrument which is used for testing is Phantom Loading.

Some of the test is performed for LT Meters are:

Creep Test:This test is done by energizing only the

pressure coil by supplying rated 220V whereas no current flows through the current coil. In this case the indicating LED should not blink.

Main Aim of this Test is to find out whether the Meter is operating or not operating in No load condition.

STARTING CURRENT TEST: In this test the current coil is energized

by 0.5% of the base current to check whether the meter is working or not.

HTMT(High Tension Meter Testing) Instead of only energy meter, energy

meter is used along with Metering unit ( A CT& PT combination).It is generally used when the supply ranges between 22kv and 66 Kv.

This Metering unit provides 110v, 5A at the secondary Side.

Metering Unit

The tests which are carried out here are: Oil Test:In this Test High Voltage is applied at the Oil

to find out the Dielectric Strength of the Oil.

Voltage Ratio Test:In this test High Voltage is applies at the

Primary side and at the Secondary Side Voltage is measured and Voltage Ratio is calculated.

Ct Ratio Test:In this Test a high current is applied

through Current Injector at the Low Voltage Side and current is measured at the High Voltage side.

Meter Test:

33/11 KV Substation

In this station, high transmission is step down to lower voltage which is suitable for domestic and commercial purposes.

In this substation 33kv voltage is stepped down to 11 kv.

In substation generally more than one transmission line is used to increase the reliability. So that in case of fault in one line other is operate.

Similarly, here two transmission lines are used from Chambal Hydro Electric Power Station.

This transmission line are fed to the metering unit for determining the electric I/P power.

Then this Lines are fed to the step down transformer via Protection unit, which consists of Circuit Breaker and Relays.

Output from the step down transformer is fed to the different feeders.

The Controlling of each feeder is done in Control Unit.