Practical Training taken at
220KV GSS VKIA
Submitted To: Submitted by:
Ms.Shivani Johri Renuka Verma
Head Of Department 4th year, EE
Department of Electrical Engineering
Sri Balaji Technical Campus, Jaipur
Definition of sub-station
Capacitor voltage transformer
RVPNL is a company of Rajasthan State Electricity
Board(RSEB) established by govt. of Rajasthan.
Aim of RVPNL is to provide reliable transmission
service to customers.
220KV G.S.S.,VKIA is a part of RVPNL.
In the GSS single main and auxiliary scheme is used.
DEFINATION OF SUBSTATION
Sub station is a subsidiary station of an electrical
generation , transmission and distribution system.
It is a set of equipment reducing the high voltage of
electrical power transmission to that suitable for
supply to consumer.
Electric power may flow through several sub-station
between generated plant and consumer and may be
changed in voltage in several steps.
Lightning arrester is a protective
device which provides protection
against high voltage surges.
A lightning arrester has two
terminals viz a high voltage
terminal and a ground terminal.
transformer are special
kind of power transformer.
It is used to step down extra
high voltage signals and
provide a low voltage signal
for operating a protective
WAVE TRAP ( line trap )
A line trap (high-frequency
stopper) is a maintenance-
free inductor, mounted inline
on high voltage AC
transmission power lines to
prevent the transmission of
high frequency (40 kHz to
1000 kHz) carrier signals of
line communication to
It isolates the devices from
live line when there is a
It operates when there is no
It is also used to change bus
bar line from main to
reserve or vise versa.
C.T. is used to measure
high value of current.
C.T.’s secondary is
connected to relay to
protect the system against
Circuit breaker is used for break the circuit.
Today, two most popular circuit breakers are used in
substation which are: Vacuum circuit breaker & SF6
Oil and air blast circuit breaker was used in earlier
Bas bars are common
through which a large no.
of feeders operating at
same voltage have to be
The transformer is a static apparatus, which receives
power/energy at it, one circuit and transmits it to
other circuit without changing the frequency.
A protective relay is a device that detects the
fault and initiates the operation of the circuit
breaker to isolator the defective element from the
rest of the system.
I studied lot of knowledge in G.S.S. lot of
instrumentation and protection required. So i gain lot
Training at 220kv GSS VKIA gives the insight of the
real instrument used.
There are many instruments like transformer, C.T.,
P.T., L.A., relay, bus bar, capacitor bank, insulators,
isolators, controlroom, etc.
To get insight of the sub-station, how things operates,
how things manage all is learned there.
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