方向电流保护的整定对灵敏度及可靠性的影响

为提高供电的可靠性,需要采用方向电流继电保护,并且灵敏度要高。探讨了方向电流保护的整定对灵敏度及可靠性的影响,包括谐波、功率方向继电器等的影响,还探讨了一些新的整定计算方法及灵敏度、可靠性研究方面的新动向。方向电流保护的整定除满足电流整定一般原则外,还应考虑负荷电流突然增大、故障电流零序分量及与相邻线路保护的灵敏系数配合等因素。另外,可优先采用在线整定。方向继电器的内角需合理整定。谐波滤除中数字滤波器应用越来越多,较快的滤波算法意味着实时性好、可靠性高。

Influence of directional overcurrent protection setting on sensitivity and reliability

Directional overeurrent protection with a high sensitivity is necessary to prompt reliability of electric power. The influence on sensitivity and reliability caused by setting calculation of directional overeurrent protection is discussed, including influence on those of high frequency components and power directional relay. New setting calculation methods and researches on sensitivity and reliability are described. Setting of directional overeurrent protection should consider surge of load current, zero sequence component short current and sensitivity co-operation factor with near power line. In addition, online current setting should be used in priority. Inner angle of directional overcurrent protection relay should be reasonably set. On harmonic waves filtering off, digital filter is widely applied, and faster filtering algorithm means better real time characteristic and higher reliability.