基于GIS管道寄生电容的TV串联谐振升压方法研究与应用

Research and application of TV series resonant boost method based on GIS parasitic capacitance

目前GIS套管中电磁式TV大多采用级联变压器升压方法,但是由于升压的设备体积大以及所需电源容量大等原因造成在现场使用非常困难;再加上GIS套管中存在着寄生电容,如果利用传统方法升压需要的无功容量很大。因此,本文提出一种基于GIS套管中寄生电容与可调电抗器串联谐振升压方法。该方法首先对GIS套管寄生的电容进行准确测量,然后根据所测电容量选择相匹配的可调电抗器,以达到串联工频谐振条件。本文所述试验方法在220 kV谷满变电站GIS套管中电磁式TV误差试验进行了验证,该方法利用GIS套管中寄生电容与可调电抗器实现升压,提高了现场可操作性,为GIS中TV现场检定提供了参考依据。

The GIS type electromagnetic TV mostly uses the cascade transformer method,but because of the pressure of large volume,heavy equipment and power supply capacity causes such use is very difficult in the field;and there is a parasitic capacitance on the GIS casing,using traditional methods need large capacity reactive power.Therefore,this paper presents a series resonant boost method based on GIS capacity and adjustable reactor.In this method,the parasitic capacitance of the GIS casing is measured accurately,and then the matched adjustable reactor is selected according to the measured capacitance.The test method described in this paper have been verified in 220 kV substation with Valley electromagnetic GIS type TV error test field test,and the adjustable reactor to realize step-up GIS casing capacitor by using this method,improve the on-site operation,provide a reference for field test in GIS TV.