CB

TYPES OF CIRCUIT BREAKERS

CIRCUITBREAKERS ARE CLASSIFIED BASED ON THE ARC QUENCHING MEDIUM

1.  OIL CIRCUIT BREAKERS

2.  OILLESS CIRCUIT BREAKERS

MAIN EHV CIRCUIT BREAKERS ARE

•       AIRBLAST CIRCUIT BREAKERS

•       SF6 CIRCUIT BREAKERS

Testing of Circuit Breakers

FACTORY  TESTS  :

•         HIGH VOLTAGE TEST (POWER FREQUENCY TEST).

•         MILI VOLT DROP TEST

•         GAS LEAKAGE TEST

•         OSCILLOGRAPHS WITH PLOTTING SPEED/TIME CHARACTERISTIC.

•         MECHANICAL OPERATION TEST AT MIN. VOLTAGE & PRESSURE

             MAX CONTROL VOLTAGE & PRESSURE AND AT RATED CONTROL

             VOLTAGE & PRESSURE.

•        CALIBRATION OF AIR/GAS PRESSURE SWITCHES.

CIRCUIT BREAKER COMMISSIONING CHECKS

1   BREAKER TIMINGS CHECKS

2   DCRM CHECKS

3   STATIC CONTACT RESISTANCE

4   DEW POINT MEASUREMENT

5   TAN DELTA AND CAPACITANCE CHECKS

6   INSULATION RESISTANCE TESTS

7   POLE DISCREPANCY CHECKS

8   LOCK OUT PROTECTION CHECKS FOR SF6/PNEUMATIC SYSTEMS

9   REMOTE INDICATION CHECKS

10  REMOTE OPERATION CHECKS