摘要
高压变电站中一次回路与二次回路之间有多种渠道将电磁干扰加于二次回路和二次设备上,这些渠道包括传导、感应耦合和辐射,它给电力系统的安全运行带来极大的危害。隔离开关投切旁路母线对高频通道的影响是一个典型的例子。文章分析了由二次接地引线引起的干扰过电压理论,提出高频通道中的结合滤波器、高频电缆、继电保护收发信机的三级保护方法,并对其进行了现场试验。实施有效的抗干扰措施后,保证了500 kV继电保护高频通道的正常运行。
In high voltage substations, magnetic interference can be added to the protection circuits as well as the equipment by inductive coupling and radiation from main circuits. It causes great harm to the safety of power system. The influence on High Frequency （HF） channel is a typical example while the isolated switchgear switches on and off the bypass bus. This paper analyses the principle of interference over-voltage on the ground lines of protection circuits, presents three-level protection method concerning the coupling filter, HF cable and relay protection transceiver in HF channel. A field trial has also been launched. By taking these antiinterference measures, the 500 kV relay protection HF channels operate safely.
出处
《电力系统通信》
2007年第8期28-31,35,共5页
Telecommunications for Electric Power System
关键词
隔离开关
旁路母线
高频通道
isolated switchgear
bypass bus
HF channel
