Maintenance of Low Voltage Circuit Breakers

With the continuous development of science and technology and ongoing innovation in materials, the mechanisms of equipment have become more compact, durable, and have higher safety factors. Current equipment is evolving toward disassembly-free inspection and maintenance-free types. The following are inspection items for low voltage switches during system maintenance:

a. Low voltage calibration of circuit breaker closing and tripping.
b. Synchronization calibration of the circuit breaker.
c. Primary DC resistance test.
d. Primary insulation resistance test.
e. Primary withstand voltage test.
f. Adding lubricant to the transmission mechanism.
g. Inspection and calibration of fuses.
h. Inspection and calibration of the energy storage motor.
i. Inspection of primary contacts and springs.
j. Inspection and calibration of closing and tripping speed.
k. Inspection and calibration of secondary circuits, auxiliary switches, and contacts.