基于改进零序导纳的故障选线新方法
The new method of fault line selection based on theimproved zero sequence admittance
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摘要: 根据故障线路的零序导纳在高次谐波条件下明显区别于非故障线路的零序导纳这一特点,结合小波包的分频特性及小故障角接地时零序电流的特性,提出一种基于改进零序导纳的小电流接地选线新方法.该方法充分利用故障线路的暂态信息,并在选线算法构造中综合利用故障零序电流小波包重构系数的幅值与零序导纳极性的信息,以提高选线灵敏度.利用PSCAD进行仿真,结果表明,该方法不受补偿度、故障地点、过渡电阻和故障角度的影响,能够有效、可靠地选出故障线路.Abstract: According to the feature that the zero sequence of fault line significantly different from the non-zero sequence fault line in the high-order harmonic admittance conditions,combined with the characteristics of wavelet packet division and small angle to ground zero sequence fault current characteristics, a new method was proposed basing on an improved zero sequence admittance. This method makes full use of the transient fault line information and comprehensive utilization of zero sequence admittance wavelet packet reconstruct coefficient amplitude and polarity information to improve the selection and line sensitivity.Through PSCAD simulation and results showed that this method was not affected by the degree of compensation,fault location,the value of the transition resistance and the failure angle and it was able to elect fault line effectively and reliably.
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