在三相四线制供电系统中，中性线是非常重要的。
In the Three phase and Four wire circuit system, the neutral wire is very important.
介绍了在三相四线制供电系统中，中线的作用，断线的危害，以及一种简单可靠的断线保护电路。
The paper introduced the effect of neutral wire the harm of open circuit and a kind of simple credible open circuit protection method.
冲击性负荷会引起供电系统严重的电压波动和三相不平衡，对其进行平衡化补偿具有重要的意义。
It is important to provide balancing compensation for shock load because of the severe voltage fluctuation and 3-phase unbalance imposed on power supply system by it.
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