So, it is significant to prevent the occurrence of faulted neutral line within the circuit of three phase and four line system.
因此，防止三相四线制配电回路断零事故的发生，具有更广泛的意义。
In the Three phase and Four wire circuit system, the neutral wire is very important.
在三相四线制供电系统中，中性线是非常重要的。
This paper introduces an active power filter device used for three phase four wire. The compensation principle and structure of main circuit and control circuit are given.
主要介绍用于三相四线制的有源电力滤波装置的研究工作，给出了系统的基本补偿原理、主电路及控制电路结构，并利用该装置进行了补偿实验。
This paper introduces an active power filter device used for three phase four wire. The compensation principle and structure of main circuit and control circuit are given.
主要介绍用于三相四线制的有源电力滤波装置的研究工作，给出了系统的基本补偿原理、主电路及控制电路结构，并利用该装置进行了补偿实验。
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