金属氧化物避雷器短路试验(压力释放试验)的重要性分析

为了保证避雷器即使发生故障也不会损坏其他设备或者影响人身安全,短路试验是一项非常重要的试验。由于试验回路电压或容量的关系,在有些短路试验中,避雷器的短路电流第一个峰值达不到要求的试验电流有效值的1.7-2.5倍,通过短路电流的时间往往也不足0.2秒。如果所进行的试验不符合这一要求,将不能真正考验避雷器压力释放装置是否能够起到防爆作用。

The Importance Analysis of Short Circuit Test (Pressure Relief Test) for MOA

To prove failed surge arresters not to damage the other equipment or injure human body,short circuit test is important.In some tests,the magnitude of first cycle of short circuit current should not reach 1.7-2.5 times of the required one in RMS current,and the duration of short circuit should be less than 0.2s,because of the pressure and capacity of the circuit.The test will not prove the function of the pressure relief device without following those regulations.