出线套管段GIB回路电阻测量方法应用研究

Application Research of GIB loop resistance measurement method for outlet casing section

GIS(gas insulated swtchgear,气体绝缘金属封闭开关)设备的回路电阻测量是交接试验和预防性试验项目之一,通过回路电阻测量,可以检查回路的完整性,发现接触不良等缺陷,是保证设备安全运行的重要手段。GIS线路间隔回路电阻测量时,难点是出线套管段GIB(gas insulated bus,气体绝缘母线)回路电阻测量,出线套管段GIB距离一般都比较长,采用常规测量方法存在电流线展放及收线工作量大,时间长等缺点。现场结合线路停电检修时需要在出线套管引流线上挂一组三相短路接地线的特点,提出了一种利用线路三相短路接地线作为相间短接线测量出线套管段GIB回路电阻的方法,文章详细阐述了该方法的测量原理、现场试验接线,并结合现场应用实例对测量数据进行对比分析,证明了该方法测量数据与常规测量方法测量数据具有较好的等效性,可以代替常规测量方法开展出线套管段GIB回路电阻测量,并提出应用该方法的注意事项。

The loop resistance measurement of GIS （ gas insulated switchgear ） equipment is one of the items of hand-over test andpreventive test, Through loop resistance measurement, we can check the integrity of the loop and identify the defects such as poor contact, which is an important means to ensure the safe operation of the equipment. When measuring the loop resistance of GIS line, the difficulty is to measure the loop resistance in lead-out bushing Section GIB, Because of the GIB（ gas insulated bus ）, shortcomings like large workload in current cable layout and take-up, long time duration and so on exist in measuring loop resistance using conventional measurement method. Considering the fact that a three-phase short circuit ground wire is required for line outage maintenance at the site, we put forward a method of measuring the loop resistanGIB using the three-phase short circuit ground wire as the inter-phase shorting stub. This article elaboraof this method and the wire connection for the field test and takes comparative analysis on the measured data by combining the practical application example. It is proved that the measured data of the method is quite equivalent to the measured data of conventional measurement methods. It can replace conventional measurement method to carry out loop resistance measurement in lead-out bushingSection GIB, Points for attention to the application of this method.