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NORTHERN COALFIELD LIMITED33/11KV SUBSTATION

JHINGURDAH PROJECT SINGRAULI (M.P.)

PRESENTED BY:-ANUJ KUMARELECTRICAL ENGINEERINGB.TECH FINAL YEAR

MVIET

CONTENTS

IntroductionPlace of trainingMain substationClassiffication of transformerParts of transformerTransformer oil filteration s

NORTHERN COALFIELD LIMITEDIt is subsidiary of coal India.It was established in 1984 under the CCL. Its headquarter is singrauli.NCL produced 70.02 million tons of coal in the year 2012-13.NCL has following projects:-

AmlohriBlock-BBinaDudhichuaKakriKhadiaNigahiKrishnashila Jayant Jhingurdah

INTRODUCTION

PLACE OF TRAININGThe place of training is Jhingurdah project in E&M department.

E&M department has following area: -Main substation (33/11KV)Electrical and mechanical workshopWest substation (11/6.6KV & 11/3.3KN)Coal handling plantPumps plant

I worked only three of themMain substation (33/11KV)Electrical workshopWest substation (11/6.6KV & 11/3.3KN)

MAIN SUBSTATION

The supply (33/11KV) is from MPEB substation.

In this substation 05 MVA transformer are used to step down the voltage 33KV to 11 KV.

Form this substation 11KV supply is transmitted to following are:-

West substationColonyFieldCHP

TRANSFORMER

COMPONENTS OF TRANSFORMERCorePrimary & secondary windingOil tankTransformer oilOil inlet and outlet valveOil gauge/indicatorPrimary and secondary terminalEarth pointData plateExplosion ventConservatorBreatherSilica gelBuchholz relayTemperature gaugeTapping switch

CLASSIFICATION OF TRANSFORMER

On the basis of output voltage1. Step up 2.Step down

On the basis of core construction1. Core type 2. Shell type

On the basis of no. of phase 1. Single phase 2. Three phase

On the basis of cooling system1.Naturally cooled 2.Oil cooled3.water cooled 4.forced air cooled

On the basis of output capacity1.Auto transformer 2.Instrument

transformer On the basis of commercial

1.Power transformer 2.Distribution transformer

TRANSFORMER USED IN SUBSTATION

Current transformer

It is step up transformer or current step down transformer. It convert 100-200A of primary to 1-2A of secondary.

Potential transformer

It is step down transformer.

It convert 11-22KV into 50-100V.

TRANSFORMER OIL FILTRATION METHOD