Documents/Reports

Breaker Operating - Mechanism For Bhel Breaker Type BLG 102, 202 & 302

Work on the operating mechanism should be carried out only when the springs are in discharged condition and the circuit breaker is in open position.

20 E-01 Q	Clean the operating mechanism, whenever required.
20 E-02 Q	Clean the auxiliary switch contacts.
20 E-03 Q	Clean the terminal blocks
20 E-04 Q	Tighten the electrical connections.
20 E-05 Q	Check gear wheels for any wear and tear, replace, if necessary.
20 E-06 Q	Check proper functioning of closing and tripping coil.
20 E-07 Q	If overhauling has been done then check by manual charging operation of closing spring to check that the limit switch contact of closing-coil circuit closes 1-2 mm before the contact in the motor circuit; opens.
20 E-08 Q	Check the function of limit switch.
20 E-09 Q	Check whether heater is functioning properly.
20 E-10 Q	Check that the foundation bolts are properly tightened.

20 E-11 Y	Check the earthing of operating mechanism cubicle.
20 E-12 Y	Replace the parts if wear and tear is more.
20 E-13 Y	Gear wheels should be lubricated ensuring that no grease comes into the friction clutch. Wipe off if it is there. Grease 784 is to be used.
20 E-14 Y	Apply rust preventing medium on untreated surfaces of iron and steel.
20 E-15 Y	Check operation of motor.