设备是配置为二线制或四线制的系统吗？

Is the device configured for two wire or four wire systems?

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首先，本文针对三相四线制的电流检测方法进行了研究。

First of all, current detection method for three-phase four-wire system is researched.

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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.

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