摘要
针对西北750 kV超高压电网所处特殊自然环境下易遭受过电压危害的特点,研究探索750 kV电网过电压监测方法。根据变压器电容式套管结构原理,研制出系列750 kV变压器套管末屏连接专用精密低压臂分压器,与套管电容组成测量过电压信号的冲击电压分压系统。分析研究了750 kV变压器套管末屏频率响应特性,该系统可满足电网雷电冲击、操作冲击过电压现场测量的要求。论证了750 kV电网采用变压器电容式套管末屏连接低压臂分压器进行过电压监测的可行性。
As 750 kV northwest power grid easily sufl＇eres from overvohage damage which due to special location and environment, the methods of overvoltage online monitoring are researched. Based on the configuration of transformer capacitive bushing, a series of special low voltage dividers connected with the tap of transformer hushing are devised. The high voltage divider systems are composed with hushing capacitance and low voltage capacitive dividers for getting overvoltage signal. The frequency response of 750 kV transtormer bushing tap dividers are fulfilled online monitoring for lighting impulse and switching impulse. Finally, the technical feasibility of the overvohage online monitoring for 750 kV power grid is demonstrated.
出处
《陕西电力》
2009年第8期14-17,共4页
Shanxi Electric Power
