| 故障电流将远远小于带电阻接地时候的数值 |
| 添加时间：2019/6/28 14:22:02 浏览次数： |
| 这个时候如过发生单相接地的故障的时候，流经故障线路的故障电流仅为系统的单相接地的电容电流，故障电流将远远小于带电阻接地时候的数值，零序保护装置可能会拒动； At this time, if a single-phase grounding fault occurs, the fault current flowing through the fault line is only the capacitive current of the single-phase grounding system, and the fault current will be far less than the value when grounding with resistance, and the zero-sequence protection device may refuse to operate. 由于系统的单相接地的电容电流比较远大于10A，往往会引起波及整个系统的、幅值很高的间歇性弧光接地的过电压以及谐振的过电压，提高继电保护装置的灵敏度用以作用于跳闸，同时又可以使故障点仅仅可能发生局部的轻微灼伤，有时候还会引起非故障相的绝缘击穿，造成重大的设备烧毁事故，危及发电机中性点接地电阻柜系统的安全运行。 Because the single-phase grounding capacitive current of the system is much larger than 10A, it often causes the over-voltage of intermittent arc grounding with high amplitude and resonance, which affects the whole system. The sensitivity of the relay protection device is improved to act on tripping, and at the same time, only minor local faults may occur at the fault point. Burns can sometimes cause insulation breakdown of non-fault phase, causing major equipment burning accidents, endangering the safe operation of the generator neutral grounding resistance cabinet system. |
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