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零序保护原理
原理概述
An overview of the principles
零序电流保护具体应用可在三相线路上各装一个电流互感器（CT），或让三相导线一起穿过一零序CT，也可在中性线N上安装一个零序CT，利用这些C.T来检测三相的电流矢量和，即零序电流Io，IA+IB+IC=Io，当线路上所接的三相负荷完全平衡时（无接地故障，且不考虑线路、电器设备的泄漏电流），Io=0；当线路上所接的三相负荷不平衡，则Io=IN，此时的零序电流为不平衡电流IN；当某一相发生接地故障时，必然产生一个单相接地故障电流Id，此时检测到的零序电流IO=IN+Id，是三相不平衡电流与单相接地电流的矢量和。
Zero-sequence current protection can be used in three-phase line with a current transformer (CT), or let three-phase conductors through a zero-sequence CT, or in the neutral line N with a zero-sequence CT, using these C.T to detect the three-phase current vector sum, namely zero-sequence current Io, IA + IB + IC = Io, when the line connected to the three-phase load is completed. In full balance (no grounding fault, and do not consider the leakage current of the line, electrical equipment), Io = 0; When the three-phase load connected on the line is unbalanced, then Io = IN, the zero-sequence current is unbalanced in this case; When a phase grounding fault occurs, it will inevitably produce a single-phase grounding fault current Id, zero detected at this time. The sequence current IO=IN+Id is the vector sum of the three-phase unbalanced current and the single-phase earth current.
An overview of the principles
零序电流保护具体应用可在三相线路上各装一个电流互感器（CT），或让三相导线一起穿过一零序CT，也可在中性线N上安装一个零序CT，利用这些C.T来检测三相的电流矢量和，即零序电流Io，IA+IB+IC=Io，当线路上所接的三相负荷完全平衡时（无接地故障，且不考虑线路、电器设备的泄漏电流），Io=0；当线路上所接的三相负荷不平衡，则Io=IN，此时的零序电流为不平衡电流IN；当某一相发生接地故障时，必然产生一个单相接地故障电流Id，此时检测到的零序电流IO=IN+Id，是三相不平衡电流与单相接地电流的矢量和。
Zero-sequence current protection can be used in three-phase line with a current transformer (CT), or let three-phase conductors through a zero-sequence CT, or in the neutral line N with a zero-sequence CT, using these C.T to detect the three-phase current vector sum, namely zero-sequence current Io, IA + IB + IC = Io, when the line connected to the three-phase load is completed. In full balance (no grounding fault, and do not consider the leakage current of the line, electrical equipment), Io = 0; When the three-phase load connected on the line is unbalanced, then Io = IN, the zero-sequence current is unbalanced in this case; When a phase grounding fault occurs, it will inevitably produce a single-phase grounding fault current Id, zero detected at this time. The sequence current IO=IN+Id is the vector sum of the three-phase unbalanced current and the single-phase earth current.
