1. Maintenance of low-voltage circuit breaker: With the continuous development of science and technology and the continuous creation of new materials, the mechanism of the equipment is relatively compact, durable and with high safety factor. The equipment has developed to the type of disassembly-free maintenance-free The following introduces the inspection items of low-voltage switch with the maintenance of the system. A, short circuit breaker, switch low voltage effect. B, the circuit breaker effect at the same time. C, a DC resistance test. D, an insulation resistance test. E, a withstand voltage test. F. Add lubricant to the transmission mechanism. G, check the efficacy fuse. H, check and verify the energy storage motor. I. Check the fork and spring once. J, check, effect test, switch speed. K, check, check the secondary and auxiliary switches and contacts.
Second, the maintenance of automatic air switch: the automatic air switch is more complicated than contactor and magnetic starter in structure, so it has a set of well-taught arc extinguishing devices. The automatic air switch can automatically cut off the circuit in case of overload, short circuit, low voltage or voltage loss. Common automatic air switches include A, close and switch test. B, add lubrication to the transmission mechanism. C, interphase insulation resistance efficacy. D, switch over-current effect. E, check the access points. F, check the arc extinguishing grid. G, the contact maintenance.
Third, the maintenance of the breaker switch: a, check the fixed and movable blade. B, check the blade spring. C, check the shaft pin. D, effect test, switch position. E, check and verify the transmission mechanism. F, interphase and ground insulation resistance efficacy.
Four, electromagnetic contactor maintenance: a, check the magnetic coil contact. B. DC resistance test of magnetic coil. C, check the contact and pressure spring. D, check the iron core and iron core contact surface. E, check the arc cover.
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