阐述某抽水蓄能电站4号机组上导瓦温突变导致跳闸事件,基于排查、处理全过程,主要归咎于RTD电缆屏蔽层未接地,在大电机强电磁干扰信号叠加下形成温度模拟量突变虚高引起跳机。故应认真对待二次电缆屏蔽层的接地方式,以有效抑制变压器、电机或大电流电缆所产生的电磁干扰。 Based on the investigation and treatment, the main cause of the tripping event is that the shielding layer of the RTD cable is not grounded. Under the superposition of strong electromagnetic interference signals of large electric machines, a sudden change of temperature analogue quantity is formed High causes the jump machine. Therefore, the grounding of the secondary cable shielding should be taken seriously so as to effectively suppress the electromagnetic interference generated by the transformer, the motor or the high-current cable.