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1. Submitted to:
Mr. Deepak Sharma
(Head of department)
EE
Submitted by:
Harvindar Singh
11EAYEE016
B.Tech. 4th Year VII Sem.

2.  PLCC
Single Line Diagram
Power Transformer
Current Transformer
Isolator
Lightining Arrester
Wave Trap
Grounding
BATTERY Room
Control Room
Potential Transformer
Conductor
Circuit Breaker
Introduction

3. Sub-station is a subsidiary station of an
electricity transmission and distribution system
where voltage is transformed from high to low
or low to high voltage using transformers.
TYSYS

4. TYPICAL AC SUPPLY SYSTEM
DESG

5. • Sub-station should be located at load center
• Sufficient land area
• Grounding
• Easy of maintenance
• Reliability and Security
• Electrical design considerations
1LD

7. ISO
Lightening arrester is first equipment of GSS, it is protected all the equipment
against the high voltage lightening surge.

8. For 400kV line : Taran Tulla and Marculla conductor.
For 220kV line : Zebra conductor is used composite of Aluminium strands and
Steel wires.
For 132kV line : Panther conductor is used composite of Aluminium strands and
Steel wires.
For 66Kv line : Dogi conductor is used seven steel wire and seven AL wires.
For 33Kv Line : Vigal conductor is used seven conductor of aluminum.

9. I. POWER TRANSFORMER
II. CUREENT TRANSFORMER
III. CVT/POTENTIAL
TRANSFORMER

10. CLNG
To step-up or step-down the voltage and transfer
power from one a.c. voltage to another a.c. voltage at
the same frequency.

11. PT
It is used for measurement the of electrical primary
winding current , The current transformer is always connected in
series.

12. Used for step-down voltage for measurement protecting &
control.

13. CB

14. TF
 Isolator is a switching devices used to open or closed
a circuit either when a negligible current exit , To disconnect
transmission line under no-load condition.

15. CB

16. •Air Blast Circuit Breaker
•SF6 (Sulphure hexa floride) Circuit Breaker
•Vacuum Circuit Breaker
•Minimum oil Circuit Breaker
WVTP

17. Ground is the reference point in an electrical circuit from which other
voltages are measured, a common return path for electric current (earth
return or ground return), or a direct physical connection to the Earth.

18.  To operate all the equipment or
device from operator room is
called control room.

19. In a GSS, separate dc supply is maintained for signalling remote
position control, alarm circuit etc.
Direct current can be obtained from battery at 120volt.(55 battery,each
2.2v)

20. Power Line Carrier Communication (PLCC) Provides Communication
From One Gss To Other Gss.

21.  Wave trap is used to trap the communication signals & send PLCC
through CVT.
It’s rating is 0.3mH.