摘要
提出了双端故障测距的实用化方法,利用相模变换矩阵将不对称的三相线路解耦为完全独立的模量,选择合适的模量绝对值实现测距。鉴于保护装置的计算局限性,为使测距算法实用化,首先考虑了双曲函数的泰勒逼近,以及波阻抗和传播系数的简化。搜索故障位置时,利用电压分布规律,给出了两条直线相交搜索故障位置法。当线路两端带有并联电抗器时,测距电流所用的数据必须去掉并联电抗器上的电流,然后才开始计算。EMTP仿真表明,该实用算法不受过渡电阻的影响,计算量小,避免伪根,同时精度可满足实际的测距要求。
A new search way for fault location based on two-terminal is proposed in the paper. The two-terminal fault location method uses transform matrix between phase and modulus to decouple the asymmetric three phase line to absolute modulus, selects proper modulus absolute value to realize fault location. The practical algorithm uses Taylor series to approximate the hyperbolic function, simplifies wave impedance and propagation coefficients. When searching fault location, it first uses the intersect dot of two beeline to find the actual fault location. When the transmission line has shunt reactors, the current of fault measurement should get rid of the effect of shunt reactor＇s current. The simulation of EMTP shows that the proposed method has high accuracy, less calculation burden, avoids pseudo-root, satisfies the practical fault locating need, and can afford the effect of transition resistor.
出处
《继电器》
CSCD
北大核心
2007年第23期9-13,共5页
Relay
关键词
输电线路
双端测距
分布参数
伪根
EMTP仿真
EHV transmission lines
two-terminal fault location
distributed line parameter
pseudo-root
EMTP simulation
