电压公共回路N600两点接地查找方法探讨  

The Test method for Two or More Points Earthing at N600 in the Public Voltage Loop of Substations

作　　者：张大贵[1] 

机构地区：[1]贵阳供电局,贵阳550002

出　　处：《南方电网技术》2009年第B11期15-19,共5页Southern Power System Technology

摘　　要：变电站电压公共回路N600两点或多点接地,当系统发生故障,将造成中性点的电压相位偏移,影响相电压与零序电压的幅值与相位,从而可能导致距离保护、零序方向保护误动或拒动。因此,保证N600回路一点接地显得非常重要。文章针对该回路是否为一点接地列出了具体的试验方法,包括电阻法、电流法和电压法。这些方法在实际工作中得到了验证,效果较好,可推广应用。While there is a ground fault of two or more points at N600 in the public voltage loop of substation, the neutral phase shift will occur when there are system faults so that the phase voltage and zero-sequence voltage are changed, and thus the mal-operation and refuse operation of the distance protection and zero-sequence directional operation may happen. This means that it is very important to ensure only one-earthing point to exist at the N600. This paper presents the specific test methods to verify whether there is only one-earthing point in the system, including the resistance method, current method and voltage method. All these methods that are validated in practical work are feasible and deserved to be generalized.

关 键 词：电压回路 N600 两点接地 查找方法 

分 类 号：TM645[电气工程—电力系统及自动化]