A grid substation receives high voltage transmission electricity and steps it down using transformers for distribution. It contains equipment like lightning arresters, bus bars, protective relays, circuit breakers, isolators, current and potential transformers, power transformers, earthing systems, capacitor banks, and battery banks. The 132kV Mahaveer Nagar GSS in Kota has a capacity of 115MVA, receives power on a 132kV feeder and distributes it on lower voltage feeders to supply various areas.

1. Submitted To:-
MR. Ashok Kumar Sharma
(Associate professor)
Presented By :-
Pramod Nagar
Roll No. – 17/770
Batch – EE-6
7th Sem. (EE)

2. CONTENT
1. Certificate
2. What is Grid Sub-Station (GSS)
3. Single Line Diagram
4. Lightning Arrester
5. Bus Bar
6. Protective Relay
7. Circuit Breaker
8. Isolator
9. Current Transformer
10.Potential Transformer
11.Power Transformer
12.Wave Trap
13.Earthing
14.Capacitor Bank
15.Battery Bank

3. Certificate

4.  A grid sub-station is where transmission voltages comes to be stepped
up/stepped down by three phase transformer
What is Grid Sub-Station (GSS)

5. Single Line Diagram

6. About 132 KV Mahaveer Nagar GSS Kota
Total Capacity of GSS - 115 MVA
132 KV Incoming Feeder - Sakatpura 220 KV GSS
132 KV Outgoing Feeder - Deoli Manjhi
33KV Outgoing Feeder - 8 (Ranpur, RMIDC, Dada Bari, B.Vihar,
Talwandi, R.K. Puram, Indra Vihar, PHED)
11 KV Outgoing Feeder - 7 (M.N.1st, Balaji Nagar, M.N. 2nd, M.N. 3rd,
M.N. Ext., Medical College, Rangbari)

7. Lightning Arrester (LA)
 It is the first protective equipment in the
GSS.
 Lightning Arrester is a protective device
which provides protection against the
high voltage from lightning.
 A lightning Arrester has two terminal one
is the high voltage terminal and another
one is ground.

8. Bus Bars
 An electrical bus bar is defined as a
conductor or a group of conductor
used for collecting electric power from
the incoming feeder and distribute
them to the outgoing feeders.
 Bus Bar is made from copper (Cu) or
Aluminium (Al).
Types of Bus Bar
1. Main bus bar.
2. Auxiliary bus bar.

9. Protective Relay
 Protective Relay are the sensing device.
 It is sense the abnormal condition in
electrical circuit and gives the tripping
command to the circuit breaker.

10. Circuit Breaker
 Circuit Breaker are automatically
operated electrical switch.
 Operate at ON LOAD Condition.
 It separate faulty circuit from healthy
circuit.
Types of Circuit Breaker
1. Air Circuit Breaker
2. SF6 Circuit Breaker
3. Vacuum Circuit Breaker
4. Oil Circuit Breaker

11. Isolator
 Isolator is a device which is used to
break the circuit under no load
condition.
 It is used for maintenance purpose
with safety.
 It is also known as OFF - LINE
switch.

12. Current Transformer
 Current Transformer is an instrument
transformer which is used for
protection and metering of high value
of current.
 Secondary side of CT is connected
from relay coil.
 It is always connected in series with
system.

13. Potential Transformer
 Potential Transformer is an instrument
transformer which is used for
protection and measurement of high
voltage.
 PT is used to step down of voltage.
 It is connected in parallel with the
system.

14. Power Transformer
 Power Transformer is a static ac device which transfer power from one
electrical circuit to another electrical circuit without change in frequency.
 Working Principal – Faraday’s Law of Electromagnetic Induction.
Types of Power Transformer
1. Step Up Transformer
2. Step Down Transformer

15. Earthing
 The process of transferring the immediate
discharge of the electrical energy directly
to the earth by the help of the low
resistance wire is known as the earthing.
 It is used for protection against danger
electrical shocks.
Types of Earthing
1. Plate Earthing
2. Pipe Earthing

16. Capacitor Bank
 For compensate the reactive power,
we use capacitor bank.
Advantages
1. It reduces line current of the
system.
2. It improves voltage level of the
load.
3. It improves power factor.

17. Battery Bank
 It is responsible for supplying all the
relay panels which are situated in
control room.
 Relay panels works on 110V DC
supply.
 In battery room 55 batteries are
connected in series, each battery is 2V.

18. Thank You