变电站内的电磁干扰及电磁兼容问题

Problems of Electromagnetic Interference and Compatibility within Substations

变电站是一二次设备最集中的场所 ,系统运行方式的改变 ,开关的动作 ,雷电流的出现以及二次电缆间的电磁耦合都会对二次回路产生干扰 ,特别是引进微机监控和保护设备后 ,电磁干扰问题更不容忽视。海南省几个变电站改造 ,采用在互感器原、副绕组间装设屏蔽层 ,加装浪涌吸收器 ,采用多层电缆并将电缆外皮多点接地 ,以及对控制室信号线和计算机室进行屏蔽等抗电磁干扰措施后 ,收到了良好的效果。

The substation is the place where the primary and secondary equipment is concentrated mostly.So change of operation mode of the system,action of switches,occurrence of the thunder current and electromagnetic coupling between the secondary cables will produce interference on the secondary circuit,especially after introduction of the microcomputer control and protection the problem of the electromagnetic interference can not be ignored.For retrofitting several substations in Hainan province the shielding course is placed between the primary and secondary windings of the mutual inductor,the surge absorber is equipped,multiple layer cable is adopted with multiple ground points outside the cable sheath,the interference.The above measures have obtained achievement.