Rockwell Allen-Bradley 1794-TBN 1747L532
1.雷击
当变电站的接地部件或避雷器遭受雷击时，由于变电站的地网为高阻抗或从设备到地网的接地线为高阻抗，都将因雷击产生的高频电流在变电站的地网系统中引起暂态电位的升高，就可能导致继电保护装置误动作或损坏灵敏设备与控制回路。
2.高频干扰
如果电力系统在隔离开关的操作速度缓慢，操作时在隔离开关的两个触点问就会产生电弧闪络，从而产生操作过电压，出现高频电流，高频电流通过母线时，将在母线周围产生很强的电场和磁场，从而对相关二次回路和二次设备产生干扰，当干扰水平超过装置逻辑元件允许的干扰水平时，将引起继电保护装置的不正常工作，从而使整个装置的工作逻辑或出口逻辑异常，对系统的稳定造成很大的***。高频电流通过接地电容设备流人地网，将引起地电位的升高。
3.辐***扰
在新时期，电力系统周围经常会步话机和移动通信等工具，那么它的周围将产生强辐射电场和相应的磁场。变化的磁场耦合到附近的弱电子设备的回路中。回路将感应出高频电压，形成一个假信号源，从而导致继电保护装置不正确动作。
4.静电放电干扰
在干燥的环境下，工作人员的衣物上可能会带有高电压，在穿绝缘靴的情况下，他们可以将电荷带到很远的地方，所以当工作人员接触电子设备时会对其放电，放电的程度依设备的接地情况，环境不同而不同，严重时会烧毁电子元件，***继电保护系统。
5.直流电源干扰
当变电所内发生接地故障时，在变电站地网中和大地中流过接地故障电流，通过地网的接地电阻，使接地故障后的变电站地网电位高于大地电位，该电位的幅值决定于地网接地电阻及入地电流的大小，按我国有关规程规定其***大值可达每千安故障电10V。对于直流回路上发生故障或其它原因产生的短时电源中断接电源的干扰主要是直流与***，因为抗干扰电容与分布电容的影响，直流的***可能极短，也可能较长，在直流电压的***过程中。电子设备内部的逻辑回路会发生畸变，造成继电的暂态电位差，从而影响整个保护系统。
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