By analyzing a maloperation event of high-frequency protection, it is discussed that the motion action of WXB-15 relay protection when power direction is changed in false.

• 通过对一次高频保护误动情况进行分析,讨论了WXB 15保护在双回线中区外故障切除后,功率倒方向时存在的问题,并提出了改进意见。