three-phase and four-wire system 三相四线制
three-phase and three-wire sysyem 三相三线制
Three phase and four-wire 三相四线交流电源
The relation formula is given by calculating the phase current and central wire current, thus the motivation of central wire choice is offered.
通过对相电流及中线电流的计算，给出了二者的关系式，为确定选择中线提供了理论依据。
Effective shielding can be achieved by reducing the breakdown probability of the gap between shielding wire and phase conductor.
提高避雷线保护的有效性可以通过减小避雷线—相导线间隙击穿概率来达到。
Thermal ignition temperature was defined, the thermal ignition process of electric hot wire initiating devices was divided as calefactive phase and explosion phase.
定义了热点火温度，将桥丝式电火工品的热点火过程分为升温阶段和爆炸阶段。
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