1100 kV GIS设备主回路绝缘试验电气参量估算方法研究

为了实现1100 kV气体绝缘组合电器(GIS)主回路绝缘试验的分段、设备选择以及参数匹配的合理性，提出一种电气参量估算方法。首先，概述主回路绝缘试验方法，阐述试验原理和加压程序。然后，综合考虑试验频率和设备容量等限制条件，提出了有无并联补偿两种情况下变频串联谐振装置试验能力的估算方法。接着，提出了指定试验范围时特高压GIS主回路绝缘试验电气参量的估算方法。最后，以某特高压GIS主回路绝缘试验为例，估算变频串联谐振装置的试验能力，验证指定试验范围时电气参量估算方法的准确性。该估算方法能够准确地评估变频串联谐振装置的试验能力，实现指定试验范围时电气参量的准确估算，为特高压GIS主回路绝缘试验的分段和设备选择提供了可靠的参考。

Research on evaluation method of electric parameters of 1100 kV GIS main circuit insulation test

In order to realize the rationality of the segmentation, equipment selection and parameter matching of the main circuit insulation test of 1100 kV Gas Insulated Switchgear (GIS), this paper presents an electrical parameter estimation method. First, the test method of main circuit insulation is given and the test principle and voltage program are outlined. Then, considering the limitation of test frequency and equipment capacity, the methods of estimating test capacity of the variable-frequency series resonant device with or without parallel connection are presented. Next, it proposes a method of how to estimate electrical variables of the Extra-High-Voltage (EHV) GIS main circuit insulation test at specified range. Finally, an example of EHV GIS main circuit insulation test is given to estimate the test capability of the series resonant device and to verify the accuracy of the electrical variables estimation method. The estimation method can accurately evaluate the test capability of the variable-frequency series resonant device, and realize the accurate estimation of the electrical parameters when specifying the test range, which provides a reliable reference for the segmentation and equipment selection of the EHV GIS main circuit insulation test. This work is supported by National High-tech R & D Program of China (863 Program) (No. 2015AA050204) and Science and Technology Project of State Grid Corporation of China (No. 520626150032).