变电所继电保护电磁干扰问题分析及解决方案

Analysis and Solutions for Relay Protection against Electromagnetic Interference on Substations

高压变电所是一个具有高强度电磁场环境的特殊地域,而装在所内的各类继电保护装置不断受到各种强电磁场的干扰。因变电所自动化系统大规模的使用和继电保护设备的不断更新,干扰问题逐渐显露出来,并成为继电保护误动拒动和电力监控系统不正常工作的主要原因之一。从广州地铁3号线中压开关误跳闸实际故障入手,分析故障原因,有针对性地提出相应的抑制措施,以达到有效的抗干扰目的。

High-voltage substation is a special place with high intensity electromagnetic fields which will continuously interfere with a variety of protection devices. With the large-scale use of integrated substation automation system and the constant renewal of relay protection equipment,interference gradually appeared,which became one of the reasons for maloperation,misstrip of relay protection equipment and upon which power monitoring system could not work properly. This article discusses the medium-voltage switch maloperation of Guangzhou metro Line 3 and analyses the causes of the malfunction with suppression methods put forward to achieve the objectives of effective anti-interference.