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。
In other words, the circuit may be physical two - wire (or even physical one - wire) and logical four - wire, performing as a four - wire circuit but employing fewer than four wires.
换句话说，电路可以是物理双线(甚至是物理单线)、逻辑四线，它使用较少的线实现四线电路。
In fact, a four - wire circuit can be established without the use of any wires at all, as in the case with a circuit established over microwave, satellite, or infrared transmission systems.
事实上，可以不使用任何线来建立四线电路，例如通过微波、卫星或红外传输系统。
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。
The control circuit is a self-balancing current loop which makes use of a four-terminal resistor of nickel wire to assure a close-loop both electrically and thermally.
控温电路采用四端电阻自平衡电流环路，从而保证其电气和温度均处于闭环状态。
To minimize measurement error due to channel resistance, use a four-wire switching circuit.
为使通道电阻引起的测量误差最小化，则采用4线切换电路。
To minimize measurement error due to channel resistance, use a four-wire switching circuit.
为使通道电阻引起的测量误差最小化，则采用4线切换电路。
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