高压输电线路发生故障后的暂态电压或电流分量中包含比工频分量更多的故障信息，充分利用这一信息是构成具有绝对选择性单端无通信保护的前提。
Moreover, it is the basis of constructing a new non communication protection through absolutely utilizing the fault information which is comprised in transient component of fault current or voltage.
文中讨论了零序电流暂态分量的大小和提取方法，对数字仿真和混合仿真试验数据进行分析，结果表明零序电流暂态分量用于单相接地故障识别是可行性的。
We choose the transient zero current prior to others, for it is bigger than others mostly. This paper discusses the size of transient zero current and the method of analyzing it.
另一方面，线路故障后直流线路保护的暂态响应特性与控制系统强相关，而对直流系统这种特有复杂性对线路保护影响的研究较少。
On the other hand, the transient characteristics of the HVDC line fault and thus the line protections are affected by the HVDC control system, which is very complicated and still a hard nut to crush.
另一方面，线路故障后直流线路保护的暂态响应特性与控制系统强相关，而对直流系统这种特有复杂性对线路保护影响的研究较少。
On the other hand, the transient characteristics of the HVDC line fault and thus the line protections are affected by the HVDC control system, which is very complicated and still a hard nut to crush.
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