多分支系统中SPD配合的研究

通过理论分析和软件仿真,研究了低电压系统中多分支电路对开关型SPD和限压型SPD之间的配合,及限压型SPD间配合的不同影响.研究表明,各支路波阻抗的并联效果有利于设备的保护,使MOV型SPD间的配合效果提高,但开关型和MOV型SPD配合时,易造成开关型SPD不动作,在工程实践中应予注意.

Study on the Coordination of SPD in Multi-Line Low Voltage AC Power Systems

By theoretical analysis and software simulation,the influences of the outgoing multi-line in low-voltage AC power system on the coordination between voltage switching type SPD and voltage limiting type SPD,as well as the coordination between voltage limiting type SPDs were studied.Research results show that for the coordination of two voltage limiting type SPDs,the parallel effects of wave-impedance of connecting lines are helpful to the protection of electrical equipments and can improve the coordination effects of SPDs;but for the coordination of voltage switching type SPD and voltage limiting type SPD,it is possible to cause coordination failure and should pay more attention to it in practices.