Report on sub station 220kV

Submitted by:-Ishant Kumar Siddhrau0201EE101027,Jabalpur Engineering College, JabalpurSubmitted To:-

SUMMER TRAINING REPORT

MADHYA PRADESH

POWER TRANSMISSION COMPANY LIMITED

summer TRANING REPORT ON

220/132/33 kV Substation MPPTCL, Jabalpur

Submitted To:-

Submitted By:-Ishant Kumar

SiddhrauJabalpur

Engineering College

index INTRODUCTION ACKNOWLEDGEMENT PREFACE DETAILS OF SUB STATION ACCESSORIES OF TRANSFROMER INSULATORS EQUIPMENTS ON FEEDER CURRENT TRANSFORMER TYPES OF PROTECTION POTENTIAL TRANSFORMER CONDUCTORS LIGHTNING ARRESTORS FORMULAE FOR CACULATION OF CURRENT

INTRODUCTION

This is a report on summer training I received at 220/132/33 kV

Substation, MPPTCL, NAYAGAON, Jabalpur (M.P.) during ______ 2012. This enabled me to learn the process of POWER TRANSMISSION between different voltage levels. This helped to learn each vital

accessories of a Sub Station like transformer, Lightning Arrestors, Current and Potential Transformers and Protective devices etc……

ACKNOWLEDGEMENT

I am highly thankful to 220/132/33 kV Substation, NAYAGAON

ENGINEERS AND TECHNICAL STAFFS for providing me vital and

valuable information about the different facts of a Sub Station. I express

my gratitude to HUMAN RESOURCE AND DEVELOPMENT

department for giving me a chance to feel actual power transmission

environment and its working in 220/132/33 kV Substation,

MPPTCL, NAYAGAON, Jabalpur and I am thankful to all Engineers

and Staff members for giving their precious time and help me in

understanding various theoretical and practical aspect of my training

under whose supervision I accomplish my training.

PREFACE

At very outset of the prologue it becomes imperative to insist a vocational

training is an integral part of engineering curriculum. Training allows us to

gain an insight into the practical aspect of various topics, with which we

come across while pursuing our B.E. i.e. vocational training gives us

practical implementation of various topics we already have learned and

will learn in near future. Vocational training always emphasizes on logic

and common sense instead of theoretical aspect of subject.

On my part I pursued two weeks training at 220/132/33 kV Substation,

MPPTCL, NAYAGAON, Jabalpur. The training involved a study of various

departments of the organization as per the time logically scheduled and

well planned given to us.

The rotation in various departments was necessary in order to get an

overall idea about the working of the organization.

ISHANT KUMAR SIDDHRAU

JABALPUR ENGINEERING COLLEGE

JABALPUR

DETAILS OF SUB STATION

Name of Sub Station:- 220/132/33 kV Substation MPPTCL, Jabalpur

Capacity in MVA:- 400 MVA

Details of Power Transformer:-

220/132/33 kV

1) 3x 40 MVA BHEL made transformer (Single Phase Unit)(Auto transformer)

Current Rating:-220 kV 315 Amp132 kV 525 Amp33 kV 303 Amp

2) 3x 40 MVA MITSUBHISI Japan made transformer (Single Phase Unit)(Auto transformer)

Current Rating:-220 kV 315 Amp132 kV 525 Amp33 kV 303 Amp

3) 160 MVA GEC made Transformer (Auto Transformer)Current Rating:-

220 kV 420 Amp132 kV 700 Amp33 kV 874.8 Amp

Details of 132/33 kV Power Transformer (2 Winding Transformer):-

1) 63 MVA ABB made Transformer No. 1Current Rating:-

132 kV side 275 Amp33 kV side 1102.2 Amp

2) 63 MVA VIJAI made Transformer No. 2Current rating :-

132 kV side 275 Amp33 kV side 1102.2 Amp

Details Of Station Transformer 33/0.4 kV (for Sub Station Supply)

1) 200 kVA Telaware made Transformer No. 1Current Rating :-

33 kV (HV side) 3.50 Amp0.4 kV (LV side) 266 Amp

2) 200 kVA System Control made Transformer No. 2Current Rating :-

33 kV (HV side) 3.50 Amp0.4 kV (LV side) 266 Amp

Circuit breaker:-

220 kV side:-

1) SF6 gas circuit breaker2) ABCB (Air Blast Circuit Breaker)

132 kV side:-

1) SF6 Gas circuit breaker2) MOCB (minimum oil circuit breaker)

33 kV side:-

1) VCB (Vacuum circuit breaker )2) MOCB (minimum oil circuit breaker)

Details of ACSR conductor:-

1) ACSR Panther Conductor (used for 132 & 33 kV)Materials:- Aluminum SteelTotal No. Of strands/diameter:- 30/3.0mm 7/3.0mmCurrent carrying capacity:- 427 Amp

2) ACSR Zebra conductor (used for 132 & 220 kV)Materials:- Aluminum SteelTotal No. Of strands/diameter:- 54/3.18mm 7/3.18mmCurrent carrying capacity:- 740 Amp

3) ACSR Moose conductor (used for 400 kV)Materials:- Aluminum SteelTotal No. Of strands/diameter:- 54/3.53mm 7/3.53mmCurrent carrying capacity:- 830 Amp

PROTECTION :-

1) MAIN PROTECTION (Primary Protection)a) For Transformer:- Differential Relayb) For Line:- Differential Protection Relay

2) BACK UP PROTECTION (Secondary Protection)a) For Transformer:- Over Current & Earth Fault Relayb) For Line:- Over Current & Earth Fault Relay

Details of Battery Set with Charger:-

1) 110V 300Ah Exide made Battery set2) 110V 600Ah Exide made battery set

Types of Potential Transformer:-

220 kV side:-

1) 220 kV P.T. No. 12) 220 kV P.T. No. 2

132 kV side:-

1) 132 kV P.T. No. 12) 132 kV P.T. No. 2

33 kV side:-

1) 33 kV P.T. No. 12) 33 kV P.T. No. 2

CURRENT TRANSFORMER:-

1) 100-200 / 1-1 Amp 2) 200-400 / 1-1 Amp 3) 200-400 / 1-1-1 Amp

4) 400-800 / 1-1-1 Amp 5) 600-1200 / 1-1-1-1 Amp 6) 1200/ 1-1-1-1 Amp

Accessories of Transformer:-1) Main Tank2) Wheels3) Radiator4) Cooling Fan5) Bushing6) Conservator7) Buchholz relay (Gas Actuated Relay)8) MOG (Magnetic Oil Gauge)9) Explosion Vent10) PRV/PRD (Pressure Relief Device)11) OLTC (On Load Tap Changer/ OFF Load Tap Changer)12) OLTC Conservator13) OLTC Buchholz (Oil Surge Relay)14) Oil Temperature Indicator15) Winding Temperature Indicator16) Thermosyphen Filter

Types Of Insulators:-

1) SINGLE PHASE2) With earth switch

a) Single breakb) Double break

3) Without earth switcha) Single break b) Double break

Details of Equipments used for each of the feeder:-

1) Circuit breaker2) Current transformer3) Lightning arrestor4) Wave trap5) CVT/CC (Capacitive voltage transformer/coupling capacitor)6) Isolators etc.

CURRENT TRANSFORMER:-

C.T. Ratio:- 200-100 / 1-1-1 Amp

Core (Sec. Winding):- I II III

Accuracy Class:- PS SP10 .2 , .5

I) PS:- Protective Special (used for skin protection)For Transformer: - Differential RelayFor Line: - Distance Protection Relay

II) SP10:- Accuracy class SP10 means that the maximum permissible current is 5% which has to be maintained up to 10 times the rated current.

It is used for Back up protection (Earth fault & Over Current relay)

III) .2 or .5 :- This C.T. secondary winding is used for measurement.

SINGLE RATIO CURRENT TRANSFORMER:-

DOUBLE RATIO CURRENT TRANSFORMER:-

CURRENT TRANSFORMER CONNECTION:-

1) PS :-

R-PHASE > 1S1 R-phase

1S2

Y-PHASE > 1S1 Y-Phase used 4 core 2.589 mm2 control cable

1S2 from yard to control relay panel for

B-PHASE > 1S1 B-Phase primary protection.

1S2

NEUTRAL

2) SP10 :-


2S2



B-PHASE > 2S1 B-Phase back up protection.

2S2

NEUTRAL

3) .2 or .5 :-


3S2



B-PHASE > 3S1 B-Phase line loss meter.

3S2

NEUTRAL

CURRENT TRANSFORMER Secondary Winding:-

Current transformers are available at different ratio and are used as per requirement.

They are available as:-

200-100 / 1-1 Amp, 200-100 / 1-1-1 Amp, 400-200 / 1-1 Amp, 400-200 / 1-1-1 Amp,

800-400 / 1-1-1 Amp, 600-1200 / 1-1-1-1 Amp, 600 / 1-1-1 Amp, etc…..

On the basis of configuration, they are used as:-

1) C.T. ratio:- 200-100 / 1-1 Amp or 400-200 / 1-1 AmpIn secondary winding, one is for PRIMARY PRIOTECTION and other is for METERING.

2) C.T. ratio:- 200-100 / 1-1-1 Amp or 400-200 / 1-1-1 AmpIn secondary winding, one is used for PRIMARY PROTECTION, other is used for SECONDARY PROTECTION (BACK UP PROTECTION) and last one is used for METERING.

3) C.T. RATIO:- 800-400 / 1-1-1-1-1 AmpIn secondary winding, first one is for PRIMARY PROTECTION, second one is for BACK UP PROTECTION, third one is for METERING, fourth one is for L.B.B (LOCAL BREAKER BACK UP) PROTECTION and fifth one is for BUS BAR PROTECTION.

TYPES OF PROTECTION:-

There are two types of protection called main and primary protection and back up or secondary protection.

a) MAIN OR PRIMARY PROTECTION:- The main protection is the first line of defense and it ensures quick acting and selective clearing of faults within the boundary of the circuit section or element it protects.

b) BACK UP AND SECONDARY PROTECTION:- It is the second line of defense which functions to isolate a fault sections of the system in case main protection fails to function properly.

c) L.B.B PROTECTION:- In the event of any C.B. failing to trip on receipt of trip command from protection relay all circuit breakers connected to the bus section to which the faulty circuit breaker is connected are required to the tripped with minimum possible delay through L.B.B protection.

d) BUS BAR PROTECTION:- This is required to be provided for high speed sensitive clearance of bus bar faults by tripping all the circuit breaker connected to faulty bus.

POTENTIAL TRANSFORMER:-

R Phase:-

Y Phase:-

B Phase:-

There are also two classes of accuracy wiz. .2 and SP.

1) .2 is used for METERING PURPOSE2) SP is used for PROTECTION.

CONNECTION (for .2 accuracy):-

R-PHASE > 1V1 R-phase

1V2

Y-PHASE > 1V1 Y-Phase used for METERING & often for

1V2 PROTECTION.

B-PHASE > 1V1 B-Phase

1V2

NEUTRAL

The voltage transformer may be either of the electromagnetic type or the capacitor type.

The electromagnetic type P.T.’s are commonly used when higher accuracy is required.

CONDUCTORS:-

Conductors normally used for 400 kV and 220 kV lines are given below with their electrical and mechanical properties:-

a) MOOSE conductor:- Stranding/wire diameter – 54/3.53 mm for aluminum and 7/3.53mm for steel.Voltage level used for – 400kVCapacity – 830 Amp

b) ACSR ZEBRA conductor:-Stranding/wire diameter – 54/3.19 mm for aluminum and

7/3.18mm for steel.Voltage level used for – 220 kV & 132 kVCapacity – 740 Amp

c) ACSR PANTHER conductor:-Stranding/wire diameter – 30/3.00 mm for aluminum and

7/3.00mm for steel.Voltage level used for – 132kV & 66kV& 33kVCapacity – 427 Amp

d) AAAC:- All Aluminum Alloy Conductor. It is used for 132kV, 33kV and 11kV sides.

e) AAC:- All Aluminum Conductor. It is used for 132kV, 33kV and 11kV sides.

LIGHTNING ARRESTORS:-

It is used to discharge excessive voltage building up on the line to earth due to lightning.

Voltage for Each Side Lightning Arrestor Rating

a) 220 kV 198 kVb) 132 kV 120 kVc) 33 kV 24, 27 & 30 kVd) 11kV 9 kV

FORMULA FOR CALCULATING TRANSFORMER CURRENT:-

I=Rating of transformer (¿MVA )×1000

Voltage Rating (¿ kV )×√3

Where I is current on that side of transformer of given rating on which given voltage rating is applied.

ASTIMATED CURRENT VALUE FOR A VOLTAGE FOR EACH MVA

S. NO. VOLTAGE MVA CURRENT

1. 400 kV 1 1.44 Amp2.3.4.5.6.

220 kV132 kV

33 kV11 kV

LT (435 V)

11111

2.625 Amp4.375 Amp

17.50 Amp 52.50 Amp 1440 Amp

Egs. Current for 160 MVA GEC transformers:-

By formula, I = 160×1000220×√ 3 = 419.85 Amp = 420 Amp

By table, 220 kV side will have current I = 160 x 2.625 = 420 Amp

Report on sub station 220kV

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Transcript of Report on sub station 220kV