MALVIYA NATIONAL ISTITUTE OF TECHNOLOGY,JAIPUR TRAINING

AT 400KV GSS, HEERAPURA

PRESENTATION BY:MNIT, JAIPUR

ABOUT - 400KV GSS, HEERAPURA

first 400 KV GRID SUBSTATION of Rajasthan that was established on December 1986.Rajasthan’s only oil testing laboratory

WHAT IS SUBSTATION ????

Where voltages are stepped up and stepped down

Assemblage of electrical components including bus bars, switchgear, power transformers, auxiliaries etc.

Classified as: Step up substationStep down Substation

SINGLE LINE DIAGRAM?Simply a one line diagram where

line represents Three phases One-line diagram – a diagram that

uses single lines and graphic symbols to indicate the path and components of an electrical circuit.

LIGHNTING ARRESTERSdischarge the over voltage surges to

earth and protect the equipment insulation from lightning and switching surges.

gap less ZnO or zinc oxide surge arresters are mainly used for surge protection.

located at the starting of the substation as seen from incoming transmission lines and is the first equipment of the substation.

ZnO Lightning arresters

Used to carry huge current or behave as an energy pool to which various feeder can be connected.

BUSBARS

POWER TRANSFORMERstatic machine used for transforming power

from one circuit to another without changing frequency.

At Primary Grid substation, Secondary substation, Distribution substation, mostly Step-down transformer is used.

4 transformers at Heerapura-3x250MVA+1x315MVA

=1065MVA(total capacity).Tertiary winding for power supply.

Cooling type : ONAN , ONAF , ODAF

INSULATORSUsed to avoid current leakage through

supporting structure provided to the conductors

Insulators are classified as: Pin type insulators. Suspension type insulators. Strain insulators. Shackle insulators.

Suspension and strain type insulator

Post type insulator on Isolator

ISOLATORSmechanical switch which isolates a part of

circuit from system as when requiredused to make sure that an electrical circuit

can be completely de-energized for service or maintenance

It MUST be operated on no loadTypes: A). Double Break Isolator.

B). Single Break Isolator. C). Pantograph type Isolator.

Single break isolator

Double break isolator

Simple and tandem isolators

CIRCUIT BREAKERdesigned to protect an electrical circuit from

damage caused by overload or short circuitbasic function is to operate during a fault

condition and discontinue the electric flowAccording to their arc quenching media the

CB can be divided as: oil circuit breaker air circuit breaker vacuum circuit breaker SF6 circuit breaker

SF6 Circuit breaker Vacuum

circuit breaker

INSTRUMENT TRANSFORMERused in electrical power system for

stepping down currents and voltages of the system for metering and protection purpose

These instruments transformers are of two types :

a) Current transformer b) Potential transformer

VOLTAGE TRANSFORMERStepped down high

voltage to measurable value

Voltage ratio 600/120Now-a-days ,

Capacitive voltage transformer are used instead of conventional two winding PT

Capacitive voltage transformer

combination of capacitors and inductors act as filter which is used to catch only communication  signals and leave the power waves towards load.

CURRENT TRANSFORMER Instrument transformer

used to measure currents of high magnitude.

Secondary current is proportional to primary current

Current ratio 1000:5

WAVE TRAP trap the high frequency

communication signals sent on the line from the remote substation and diverting them to the telecom panel in the substation control room.

The Line trap offers high impedance to the high frequency communication signals thus obstructs the flow of these signals in to the substation bus bars.

SINGLE LINE DIAGRAM OF

400KV GSS, HEERAPURA

FEEDERS

INCOMING FEEDERS (400kv)

1). BASSI 1 2). BASSI 2 3). HINDAUN 4). 765KV GSS

PHAGI (new)

OUTGOING FEEDERS(220kv)

1). KTPS 2). PHULERA 3). SANGANER 4). SAKATPURA 5). DUNI-SEZ (new) 6). 220KV GSS NPH

(new)

This training helped me a lot to understand many practical concepts and helped me to

verify with the theoretical knowledge .But as knowledge has no ends ,

So“Keep learning”

CONCLUSION