SF6 properties

Ever Wondered Whats so great about SF 6 ? 

Circuit Breaker Maintenance

Some ratings for knowledge:

Spring charge motor   DC 220 V

Coils  : Shunt Trip  110 V Dc

                Closing Coil   110 V Dc

There are three types of maintenance:
Corrective, Preventive and Predictive.

The governing IS for CBs:

• Routine test as per IEC 60065/IS 13118
• Testing alongwith panels to be tested as per IEC 60298/ IS 3427

Shown above is a 12 KV VCB, 1600 A, 25 kA

Interrupter Assembly:

• contacts
• arc interrupters
• arc chutes

Operating assembly

Operating rod

control panel

sealing system

Breaking Medium

• SF6
• Oil
• Vacuum and Air 

Auxiliary Equipment  :   Alarm Scheme, Annunciator etc\

What checks we should carry out in a traction substation regarding CB and interruptor?