Jaipur National University, Jaipur

A presentation on 132 KV Grid Sub-Station

By Rajneesh BudaniaBy Rajneesh Budania

Rajasthan Rajya Vidyut Prasaran

Nigam Limited (RVPNL)

Rajasthan Rajya Vidyut Prasaran Nigam Limited

(RVPNL) is a company of Rajasthan State Electricity

Board (RSEB) established by government of

Rajasthan.

Aim of RVPNL is to provide reliable Xmission

service to customers.

132 KV G.S.S., Bhadra (Hanumangarh) is a part

of RVPNL and power comes from SSTPS.

Components of A Sub-Station

1.Primary power lines 2.Ground wire 3.Overhead lines 4.Transformer for measurement of electric voltage 5.Disconnect switch 6.Circuit breaker 7.Current transformer 8.Lightning arrester 9.Main transformer 10.Control building 11.Security fence 12.Secondary power lines

Sequence of Components

Lightning Arrester (L.A.)

Lightning Arrester is a

protective device which

provides protection against

high voltage surges.high voltage surges.

A lightning arrester has

two terminals viz a high

voltage terminal and a

ground terminal.

Lightning Arrester

Schematic Circuit of L.A.

Capacitive Voltage Transformer

Wave Trap (Line Trap)

Power Line Carrier Communication

For exchange of data and transfer of messages

between substations, voice communication is

necessary. For this purpose high frequency carrier

current is transmitted over same transmission line on

which power is transmitted. Hence this which power is transmitted. Hence this communication is called as power line carrier communication .

Schematic diagram of P.L.C.C.

Isolator

It isolates the devices

from live line when

there is a maintenance.

It operates when there It operates when there

is no load.It is also used

to change bus bar line

from main to reserve or

vice versa.

Current Transformer (C.T.)

Current Transformer is

used to measure high value

of current.

C.T. ‘s secondary is C.T. ‘s secondary is

connected to relay to

protect the system

against overcurrents.

Circuit Breaker

Today, two most popular

circuit breakers are used

in sub-stations which are:

Vacuum Circuit Breaker &Vacuum Circuit Breaker &

SF6 Circuit Breaker.

Oil and Air Blast circuit

breaker was used in earlier

decades.

Bus Bar

It is a metallic bar

which has high current

carrying capability.

Bus bar is madeBus bar is made

from ‘Cu’ and ‘Al’.

Its function is to

carry electricity from

line to switchyard or

vice-versa.

Power Transformer

Transformer is a

static device that transfers

electrical energy from one

electric circuit to anotherelectric circuit to another

electric circuit by means of

a common magnetic circuit.

Transformer can link

two or more electric circuits.

Main Parts of Power Transformer

(a) Core

(b) Windings (H.V. winding, I.V. winding & L.V. winding)

(c) Tap changer

(d) Main tank

(e) Conservator Tank

(f) Buchholz Relay

(g) Dehydrating Breather

(h) Oil Temperature Indicator

(i) Winding Temperature Indicator

Oil Cooling Arrangement

Protective Relays

Protective Relay is

a sensing device and

is designed to detect

operating conditionsoperating conditions

on an electric circuit.

It trips the circuit

breaker when fault is

detected.

Thank You