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It is widely interested how to construct an active power filter to suppress the harmonics in three phase four wire system. 三相四线制系统中如何使用有源电力滤波器来抑制线路中的谐波，这一问题越来越被人们所重视。
This paper analyses the reason that neutral current is not zero when linear three phase system load connects to three phase four wire system source in Y connection. The resolution is also given. 分析了线性三相对称负载Y联接在对称三相四线制电源时 ;中线电流不为零的原因 ;并给出了解决的方法 .
AC three phase four wire system with neutral earthed 中性点接地的交流三相四线系统
three - phase four - wire system 三相四线
three phase four wire system 三相四线制
A new algorithm for random harmonic current detection based on ip-iq principle without phase lock loop in three phase four wire system 三相四线制任意次谐波电流的无锁相环ip-iq检测新方法
two phase four wire system 双两相四线制
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A two wire SYSTEM then requires two twisted pair, and a four wire SYSTEM requires three twisted pair. 一个二线制系统两个双绞双绞线对，一个四线制系统需要三个双绞线对。
Stop it! You're killing me! I think I just moved on to Phase Four! 别说了!你们杀掉我吧!我想我就要到达第四阶段了!
Compact, Robust, General purpose three phase four line filter with earth connections. 紧凑,功能完善,通用三相四线滤波器,带接地。
The results of experiment and simulation indicate that harmonics,negative and zero sequence current in three phase and f our wire system could be compensated by two types of main power circuits. 实验和仿真结果表明，这两种不同形式的主电路有着各自的特点，均可对三相四线制系统中的谐波、负序及零序电流进行补偿。
Figure 1 illustrates the concept of a multiplex wiring system. 图一表明多路传输接线系统的原理。
The structure and the component of an automotive electronic parking brake(EPB) by wire system are introduced. 论述了一种汽车线控驻车制动系统的基本结构、组成及功能。
This paper presents a decoupled control scheme for three?phase four?leg inverter through an inner current regulator based on space vector cascaded with an outer synchronous frame PI controller. 该文提出了一种采用内环空间矢量电流调节器和外环同步坐标比例积分控制器相级联的三相四桥臂逆变器的控制方案,实现了对三相四桥臂逆变器的解耦控制。
High voltage current is usually carried by overhead wire system so as to prevent living things being electrocuted. 为防止人畜触电，高压电一般采用高架线传送。
A line of communication between two points in a telephone or similar wired system. 电讯线在电话或相类似的有线系统中两端之间的通讯线路
Data transmission of mobile equipment taking radio communication as the main way is more weaker in security and reliability sides than wire system. 以无线通信为主要手段的移动设备数据传输,在安全性和可靠性方面比有线系统更为脆弱。
Phase four wire active power filter with one 基于单周控制的三相四线制有源电力滤波器
After a while it became second nature to anticipate when the next shift would occur so as to time the shift by wire system to its next logical cog. 又过了一段时间成为第二本性预见的未来时，会发生转变，以时间的转变通过有线系统，它的下一个合乎逻辑的齿轮。