基于同频同相原理的GIS设备现场交流耐压试验方法研究及应用

AC Voltage Withstand Test Method for GIS Based on Same-frequency Same-phase Principle

GIS设备扩建部分与原有运行部分仅通过母线隔离开关断开,若采用常规调频串联谐振耐压试验方法在原有运行部分带电条件下对扩建部分进行交流耐压试验,由于试验频率在30~100 Hz之间且相位不固定,则必然存在某一时刻使得试验电压和运行电压幅值反向叠加,隔离开关断口电压最大,可能导致断口击穿进而危及GIS运行设备的情况。为解决以上问题,文中通过对试验时隔离开关断口电压进行分析,找到了降低隔离开关断口电压的途径,并依此对常规串联谐振耐压试验方法进行改进,提出了基于同频同相原理的GIS设备现场交流耐压试验方法 ,研制出同频同相交流耐压试验装置,并通过现场试验,验证了试验方法的有效性和装置的可靠性。该方法的提出,使得在原有运行部分带电条件下对扩建部分进行交流耐压试验成为现实,大大提高了供电可靠性,具有十分重大的经济价值和社会效益。

The newly-built GIS and the original part are isolated only by the the conventional frequency-modulated series resonance voltage withstand test voltage withstand test of the newly-buih GIS while the original part is charged bus bar isolating switch. If method is used in the AC , because the test frequency is in the range of 30-100 Hz and the phases are not fixed, there must exists a moment at which the testing voltage and the running voltage overlaps to make the break voltage get maximum, resulting the isolating switch breakdown and GIS equipment in isolating switch break voltage during test to find a danger. To solve the problem, this study analyzed the way to reduce the break voltage, and hence improved the series resonance voltage withstand test method. Subsequently, an AC voltage withstand test method based on same-frequency same-phase principle was proposed, and the corresponding voltage withstand test device was developed. Field test verified the effectiveness and reliability of the proposed method and device. The proposed method realizes the AC voltage withstand test of newly-buih GIS possible with the original part being charged, and enhances the reliability of power supply.