Sub station maintenance

2. SUB-STATION EQUIPMENT
•POWER TRANSFORMER
•STATION TRANSFORMER
•CAPACITOR BANKS
•5 MVAR 33 KV
•2 MVAR 11 KV
•CIRCUIT BREAKER

3. SUB-STATION EQUIPMENT
• RELAYS
• CURRENT TRANSFORMERS
• POTENTIAL TRANSFORMERS
• BATTERIES CUM CHARGERS
• ALARM CUM CONTROL BOARD

4. • 440 VOLTS LT AC PANEL
• CI EARTH PITS
• AB SWITCH
– 800 AMPS DOUBLE BREAK (PIPE TYPE AND BLADE
TYPE)
– 400 AMPS SINGLE BREAK (BLADE TYPE)
• CLAMPS
– T CLAMPS
– PAD CLAMPS
– STUD CLAMPS
– PIPE TYPE T CLAMPS
• SCADA
– KIOSK (INTERFACE PANEL)
– RTU
– 48 VOLTS BATTERIES WITH CHARGER
SUB-STATION EQUIPMENTSUB-STATION EQUIPMENT

5. CIRCUIT BREAKER
• Circuit Breaker is the heart of the switch gear.
• It is a mechanical switching device which is
capable of making (Closing), breaking
(Opening) and carrying current in power
system under normal and abnormal conditions.
• Relay is a sensing device which sense the fault
current and send signal to circuit breaker to
open thus clears the fault.

6. CIRCUIT BREAKER
• 33 KV BHEL MAKE VCB
– VACCUM INTERRUPTER
WITH TOP BUSHING
– BOTTOM BUSHING
– DRIVE MECHANISM

7. CIRCUIT BREAKER
CLOSE COIL
TRIP COILS
CLOSINGSPING
MANUAL CHARGINGDRIVING GEAR BOX
MANUAL CLOSING
MANUAL TRIPPING

8. CONTROL AND RELAY PANEL

9. 220 VOLTS FLOAT CUM BOOST CHARGER WITH 80 AH
SMF BATTERIES

10. POWER TRANSFORMER

11. BREATHER

12. TRANSFORMER WINDING AND OIL TEMPERATURE INDICATORS
• WINDING TEMPERATURE READING
SHOULD ALWAYS MORE THAN OIL
TEMPERATURE READING
• OIL TEMPERATURE SET AT 80 C –
ALARM, 85 C – TRIP
• WINDING TEMPERATURE SET AT 85 C –
ALARM, 90 C TRIP
• OIL CHARARISTICS WILL CHANGE IF OIL
TEMPERATURE REACHED ABOVE 85 C
• WINDING TEMPERATURE SHOULD NOT
BE TOUCHED ABOVE 90 C, OTHERWISE
INSULATION WILL BE DETORIORATED

13. RADIATOR FINS

14. CURRENT TRANSFORMERS
• ALWAYS USE STUD TYPE
CLAMPS FOR CT BUSH
RODS
• DON’T USE MS NUT AND
BOLTS FOR CT
CONNECTIONS
• USE ONLY YELLOW
COATED/ CADMIUM
COATED CLAMPS FOR CT
BUSH RODS

15. 11 KV 2 MVAR CAPACITOR BANK

16. 2 MVAR C&R PANEL

17. SCADA PANELS

18. CI EARTH PIT

19. ALARM CUM CONTROL BOARD