Dr. A.B.madamH.O.D. Electrical dept. UCE,RTU,KOTA

Sub-station is a subsidiary station of an electricity generation, transmission and distribution system where voltage is transformed from high to low or low to high voltage using transformers. The substationdivided into two broad sections :

The switchyard The Control Room

Bus Bars

C.T.C.V.T.

Isolators

SWITCHYARD

COMPONENTS OF THE YARDCapacitor Volatege Transformer Transformers Lighting Arrester Isolators Circuit breakers Current Transformer Potential Transformer Wave Trap Insulators

MAIN FEEDERS AT 220 KV GSS ALWARIncomming feeder 220kv alwarHeerapura(Jaipur) Badarpur(Delhi) Dausa 220 KV Bhiwadi 400 KV kuskhera

Outgoing of LineSr.No. Name of line

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.

220 KV Jaipur 220 KV BTPS 220 KV Dausa 220 KV Khuskhera 220 KV Bhiwadi 132 KV Kishangar Bas 132 KV Mandawar 132 KV M.I.A. 132 KV Ramgarh 132 KV Malakhera 132 KV LCAL 132 KV Alwar 132 KV Bansur

SINGLE LINE DIAGRAM OF 220/132 KV SWITCHYARD

BUS BAR SYSTEMThe conductors used

(i)

For 400kV line : Taran Tulla and Marculla conductor.

(ii) For 220kV line : Zebra conductor is used composite of Aluminium strands and Steel wires.(1/156) (iii) For 132kV line : Panther conductor is used composite of Aluminium strands and Steel wires. (1/150)

Lightning Arrester :To discharge lightning over voltages and

switching over voltages to earth.

Wave Trap:To prevent high frequency signals from entering other zones.

Wave Trap

Isolators :Disconnection under no-load condition for safety, isolation and maintenance.

TRANSFORMERA TRANSFORMER IS A STATIC AC DEVICE WHICH CONVERT ELECTRIC ENREGY FROM ONE FORM TO ANOTHER

1.INSTRUMENTAL TRANSFORMER CURRENT TRANSFORMERA C.T IS USED TO STEP DOWN CURRENT FOR MEASUREMENT,CONTROL AND PROTECTION

POTENTIAL TRANSFORMER A P.T IS USED TO STEP DOWN VOLTAGE FOR MEASUREMENT, CONTROL AND PROTECTION

2.POWER TRANSFORMER 1.CORE TYPE 2.SHELL TYPE

Current Transformer :To step-down currents for measurement, control & protection.

132kV,CT By BHEL

CVT has two functionC.V.T.

1. To use measure high voltage

2. Its capacitance used in resonance Circuit (PLCC).

Power Transformer :To step-up or step-down the voltage and transfer power from one a.c. voltage another a.c. voltage at the same frequency.

100MVA ,220kV/132kV POWER TRANSFOMER

TRANSFORMER COOLINGNatural cooling

Forced oil cooling rediator systemForced air cooling system

Forced oil cooling rediator system Forced air cooling systemrediator

fan

40/50MVA POWER TANSFORMER

TRANSFORMERS IN ALWAR 220kV GSSThere are 7 transformer are used in ALWAR1. Three 100MVA, 220kV/132kV 2. One 40/50MVA, 132kV/33kV 3. Two 20/25MVA, 132kV/11kV 4. One 16/20MVA, 132kV/11kV

220kV GSS

PLEASE SAVE ELECTRICITY