为了提高运行中GIS局部放电检测技术的应用水平,积累现场测试和数据分析的经验,结合深圳片区运行中GIS缺陷局部放电检测的3个典型案例,对现场运维策略、放电检测方法的有效性以及图谱特征进行分析.结果表明:超高频法对悬浮电位、SF6气隙和金属尖刺类缺陷放电均有较高的检测灵敏度,超声波法难以发现较为微弱的金属尖刺类放电;GIS中悬浮放电信号的相位分布较集中,气隙放电信号的相位分布较广,金属尖刺类放电的信号幅值较不稳定.最后提出了运行中GIS局部放电检测的策略.
In order to improve the application level of partial discharge detection technology and accumu-late experience of on-site test and data analysis, three typical cases of PD detection for operating GIS in Shenzhen were analyzed, and the field maintenance strategy, the effectiveness of PD detection method, and their spectrum characteristics were discussed. The results show that the UHF method has higher detec-tion sensitivity for floating potential, SF6 air gap, and metal spike defects. It is difficult to find the weak discharge of metal spike for the ultrasonic method. The floating discharge signals in GIS have a concen-trated phase distribution, the gap discharge signals have a wide phase distribution, and the amplitude of metal spike discharge signals is unstable. Finally, the strategy of partial discharge detection for operating GIS was proposed.
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