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
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
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.
Notas del editor
pic
Edit
Primary connect in power circuit.
Secondary connect in ammeter
It is a static device which transforms electrical energy from one circuit to another without changing its frequency.