Five common failure of high and low voltage switchgear
February 23 , 2021

Analyze the reasons for the failure of the high and low voltage switchgear, mostly in the insulation, conductivity and mechanical aspects.

gis rmu sf6 switchgear

1. Insulation failure:

Insulation level is to correctly handle the relationship between various voltages (including operating voltage and various overvoltages) acting on the insulation, various voltage limiting measures, and insulation strength. Strive to make products safe and economical, and get the best economic benefits. Insulation faults are mainly manifested as external insulation-to-ground flashover breakdown, internal insulation-to-ground flashover breakdown, phase-to-phase insulation flashover breakdown, lightning overvoltage flashover breakdown, porcelain bushing, capacitor bushing flashover , Pollution flashover, breakdown, explosion, lifting rod flashover, CT flashover, breakdown, explosion, porcelain bottle fracture, etc.

2. Current carrying fault:

The main reason for the current-carrying faults in the voltage level of 72~12KV is the poor contact of the switch cabinet isolation plug, which causes the contacts to melt.

3. Failure to move or malfunction:

This kind of failure is the most important failure of high and low voltage switchgear complete sets of equipment, and its causes can be divided into two categories. The first type is caused by mechanical failure of the operating mechanism and transmission system, which are specifically manifested as mechanism jamming, component deformation, displacement or damage, loosening and jamming of the opening and closing iron core, loose shaft pin, and tripping failure. The other type is caused by electrical control and auxiliary circuits, manifested as poor secondary wiring, loose terminals, incorrect wiring, opening and closing coils burned due to jamming of the mechanism or poor transfer switches, poor switching of auxiliary switches, and operation Failure of power supply, closing contactor, micro switch, etc.

4. Breaking and closing faults:

This type of fault is caused by the circuit breaker itself. For low-fuel circuit breakers, it is mainly manifested as short circuit of fuel injection, burning of arc extinguishing chamber, insufficient breaking capacity, and explosion during closing. For the vacuum circuit breaker, the performance is the leakage of the arc extinguishing chamber and the bellows, the reduction of the vacuum degree, the reignition of the capacitor bank, and the rupture of the ceramic tube.

5. External forces and other failures:

Including foreign body impact, natural disasters, short-circuiting of small animals and other unknown external forces and accidental failures.

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