1. Misoperation failure:
This fault is the main fault of high and low voltage complete sets of equipment, and its causes can be divided into two categories. One is caused by the mechanical failure of the operating mechanism and transmission system, which is specifically manifested in mechanism jamming, component deformation, displacement or damage, opening and closing iron core looseness and jamming, shaft pin looseness, tripping failure, etc. The other is caused by electrical control and auxiliary circuit, which is manifested in poor secondary wiring contact, loose terminal, wrong wiring, burning of opening and closing coil due to mechanism jamming or poor change-over switch, ineffective switching of auxiliary switch, high and low voltage complete electrical equipment, operating power supply, closing contactor, microswitch and other faults.
2. Breaking and closing fault:
This kind of fault is caused by the circuit breaker itself. For the low oil circuit breaker, it is mainly manifested in short circuit of oil injection, burning loss of arc extinguishing chamber, insufficient breaking capacity, explosion during closing, etc. High and low voltage electrical complete equipment for vacuum circuit breaker, high and low voltage electrical complete equipment is characterized by air leakage of arc extinguishing chamber and bellows, reduction of vacuum degree, re ignition of cutting capacitor bank, rupture of ceramic tube, etc.
Complete set of high and low voltage electrical equipment
3. External force and other faults:
Including foreign body impact, natural disasters, small animal short circuit and other unknown external forces and accidental failures.
4. Insulation failure:
Insulation level is to correctly deal with the relationship between various voltages (including operating voltage and various overvoltage), various voltage limiting measures and insulation strength. High and low voltage electrical complete sets of equipment strive to make products safe and economical, and high and low voltage electrical complete sets of equipment get good economic benefits. The insulation faults of high and low voltage complete electrical equipment are mainly manifested in external insulation flashover and breakdown to ground, internal insulation flashover and breakdown to ground, interphase insulation flashover and breakdown, lightning overvoltage flashover and breakdown, porcelain insulator bushing, capacitor bushing flashover, pollution flashover, breakdown and explosion, lifting rod flashover, CT flashover, breakdown and explosion, porcelain insulator fracture, etc.
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