In the Three phase and Four wirecircuit 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。
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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.
The signal pre-processing system also has circuit to extract temperature signal via platinum thermistance, in which three-wire system and constant current measurement method are adopted.