33/11 sub station

1. SUBMITTED BY
Vivek Sharma
1447120030
SUBMITTED TO
Er. Priyanka Sharma Rawat
(Lecturer of EC Department)

2. Overview
 What is sub substation
 Basic content of electric system
 About sub-station Bad
 Single line diagram of substation
 Sub-station equipments

3. What is Substation
Substation is a combination of electrical equipment in
which change some characteristic of electric supply.
Types of substation on the basis service render
 Transformer substation
 Switching substation
 Converting substation

4. Basic Content of Electrical System

5. About Substation bad
 Receive two 3 phase supply.
 Receive power from shamshabad and baroli aheer.
 Capacity 20 MVA.
 There are Three feeders.

6. Single line diagram of sub station

7. Substation Equipment's
 Instrument Transformers
 Power Transformer
 Automatic Voltage
Regulator(AVR)
 Automatic Circuit Re-
closer(ACR)
 Insulator
 Lightning Arrester
 Bus bar
 Isolator
 Protective Relay
 Auxiliary Transformer.

8. Instrument Transformers
Instrument transformers is used for measuring and
protection purpose.
Instrument transformers are two types –
1. Current Transformer (C.T.)
2. Potential Transformer (P.T.)

9. Current Transformer (C.T.)
A current transformer steps down the current.
 Used for current measurement.
 Step down transformer.
 It is connected in series
Specification
Primary 400-200 A
Secondary 5A
Frequency 50 Hz
Weight 75 kg

10. Potential Transformer (P.T.)
It is used to step down the voltage.
 Used for voltage measurement.
 Step down transformer.
 PT is connected in parallel.
Specification
Primary 33 KV
Secondary 240 V
Frequency 50 Hz
Weight 70 kg

11. Power Transformer
 A power transformer is used for
step-up or step-down the voltage.
 Transformer has two winding
namely primary and secondary.
 Operate at nearly full load.
power transformer

12. Transformer
In Bad substation three types of transformers are
mainly used.
These are:
– Single Phase Transformer
– Three Phase Transformer
– Auxiliary Transformer
Transformer

13. Auxiliary Transformer
Auxiliary transformer used to
supply the substations own
needed power.
Auxiliary transformer

14. Parts of Transformer
 Transformer Tank
 Conservator
 Buchholz Relay
 Oil level indicator Buchholz Relay
conservator
Transformer Tank
Oil Level Indicator

15.  Bushing
 Breather
Cooling system:
 O.N.A.N- Oil Natural Air Natural
 O.N.A.F-Oil Natural Air Forced
Breather
Bushing
Cooling system
Bushing

16. Silica Gel
 Used for the absorption of
moisture in a transformer.
 Blue silica gel is fresh.
 Pink silica gel contains
moisture.

17. Automatic Voltage Regulators
 Used to regulate the
voltage.
 It takes the fluctuate
voltage and changes them
into a constant voltage.

18. Automatic Circuit Re-closer
(ACR)
 ACR is a automatic circuit.
 Under abnormal condition it will
open and under normal condition it
will closed.
 There is a interrupter for each line.
Control panel
ACR

19. Lightning Arrester
 Use to protection of power
system equipment.
 Protection against lightning
stroke.
 Passed total voltage surges to
the ground.
Lightning Arrester

20. Bus Bar
An assembly of conductors for collecting electric power and
distributing them to outgoing feeders.
Bus Bar

21. Isolator
 It is also known as
disconnecting switch.
 It used to protect the
transformer and other
equipment in the line.
 Design to open a circuit
under no load.
Isolator
Isolator

22. Distribution Transformer
 The final voltage transformation in the
electric power distribution system.
 Stepping down the voltage used in the
distribution lines to the level used by the
customer.