Investigation into the causes of overheating and burnout of the stationary and moving contacts in the vacuum circuit breaker of the generator main switchgear
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Analysis of the causes of overheating and burnout of the stationary and moving contacts in the vacuum circuit breaker of the generator’s main switchgear. Rated current: 2000A; actual operating current: 800A
Typically caused by severe overheating. Is there no wireless temperature monitoring device? The temperature should be measured regularly. When the load current is high and the contact resistance increases, considerable heat generation is inevitable.
This is the incoming side of the circuit breaker; wireless temperature monitoring is used on the outgoing side, which means that temperature measurements are taken on a regular basis. The load current is 800A, which is not high. The copper components as well as the bakelite material in direct contact with those components have turned to powder. I asked the person who carried out the maintenance three months ago, and he confirmed that all screws had been tightened properly at that time. Nevertheless, the problem was definitely caused by poor contact