296 / 2021-11-09 15:24:51

Hidden fault of relay protection in power system

relay protection; Hidden fault; Risk model

Power system and automation > Other topics in power system

relay protection plays an important role in the power system. If it does not do a good job, it will increase the hidden faults in relay protection, so as to make the power system have chain faults and affect the whole power system. There are usually multiple relay protection devices in the important links of the power system, which constitute the area of overlapping protection. When there is a hidden fault in the relay protection device, in the case of power system fault, the hidden fault identification in the overlapping protection area has complex and linkage problems, and there is a negative impact between multiple relay protection devices, Cause large-scale cascading fault response of power system. Therefore, it is particularly important to analyze the hidden fault mechanism and build a risk model for the targeted prevention of the stable operation of the power system.