SUB STATION

1. NORTHERN COALFIELD LIMITED
PRESENTED BY:-
ANUJ KUMAR
ELECTRICAL ENGINEERING
B.TECH FINAL YEAR

2. CONTENTS
Introduction
Place of training
Main substation
Classiffication of transformer
Parts of transformer
Transformer oil filteration s

3. NORTHERN COALFIELD LIMITED
It is subsidiary of coal India.
It was established in 1984 under the CCL. Its headquarter is singrau
NCL produced 70.02 million tons of coal in the year 2012-13.
NCL has following projects:-
Amlohri
Block-B
Bina
Dudhichua
Kakri
Khadia
Nigahi
Krishnashila
Jayant
Jhingurdah
INTRODUCTION

4. PLACE OF TRAINING
The place of training is Jhingurdah project in E&M department.
 E&M department has following area: -
 Main substation (33/11KV)
 Electrical and mechanical workshop
 West substation (11/6.6KV & 11/3.3KN)
 Coal handling plant
 Pumps plant
 I worked only three of them
 Main substation (33/11KV)
 Electrical workshop
 West substation (11/6.6KV & 11/3.3KN)

5. 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 substation
Colony
Field
CHP

6. TRANSFORMER

7. COMPONENTS OF TRANSFORMER
Core
Primary & secondary winding
Oil tank
Transformer oil
Oil inlet and outlet valve
Oil gauge/indicator
Primary and secondary terminal
Earth point
Data plate
Explosion vent
Conservator
Breather
Silica gel
Buchholz relay
Temperature gauge
Tapping switch

8. CLASSIFICATION OF TRANSFORMER
On the basis of output voltage
1. Step up 2.Step down
On the basis of core construction
1. Core type 2. Shell type
On the basis of no. of phase
1. Single phase 2. Three phase
On the basis of cooling system
1.Naturally cooled 2.Oil cooled
3.water cooled 4.forced air cooled
On the basis of output capacity
1.Auto transformer 2.Instrument transformer
 On the basis of commercial
1.Power transformer 2.Distribution transformer

9. 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.

10. TRANSFORMER OIL FILTRATION METHOD