Submitted to:

Mr. Deepak Sharma

(Head of department)

EE

Submitted by:

Harvindar Singh

11EAYEE016

B.Tech. 4th Year VII Sem.

PLCC

Single Line Diagram

Power Transformer

Current Transformer

Isolator

Lightining Arrester

Wave Trap

Grounding

BATTERY Room

Control Room

Potential Transformer

Conductor

Circuit Breaker

Introduction

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

TYPICAL AC SUPPLY SYSTEM

DESG

• Sub-station should be located at load center

• Sufficient land area

• Grounding

• Easy of maintenance

• Reliability and Security

• Electrical design considerations1LD

ISO

Lightening arrester is first equipment of GSS, it is protected all the equipment

against the high voltage lightening surge.

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.

I. POWER TRANSFORMER

II. CUREENT TRANSFORMER

III. CVT/POTENTIAL TRANSFORMER

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.

PT

It is used for measurement the of electrical primary

winding current , The current transformer is always connected in

series.

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

CB

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.

CB

•Air Blast Circuit Breaker

•SF6 (Sulphure hexa floride) Circuit Breaker

•Vacuum Circuit Breaker

•Minimum oil Circuit Breaker

WVTP

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.

To operate all the equipment or

device from operator room is

called control room.

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)

Power Line Carrier Communication (PLCC) Provides Communication

From One Gss To Other Gss.

Wave trap is used to trap the communication signals & send PLCC

through CVT.

It’s rating is 0.3mH.