The misoperation of high frequency protection caused by the electromagnetic disturbance was analyzed and the bad anti-jamming ability of existing coaxial-cable which is an important reason of misoperation in high frequency protection was pointed out.

• 摘要对电网高频保护通道受电磁干扰发生不正确动作现象进行了分析，指出现有同轴电缆抗干扰性能差是高频保护不正确动作的重要原因。