提高氧化锌避雷器现场带电测试精度的新措施

New Measures to Enhance the Live Testing-in-Site Precision of Zinc Oxide Arrester

分析周围强电场的静电耦合、参考电压的相位差、运行电压的谐波分量、运行电压与持续运行电压的差异等因素对氧化锌避雷器现场带电测试的影响,并提出一些提高氧化锌避雷器带电测试的新措施,包括:对法兰及引下线进行屏蔽、取就近电压互感器或CVT的计量绕组二次电压为参考电压并进行补偿、对电压进行谐波分析并进行谐波补偿、根据避雷器伏安特性进行不同电压等效等。

The influence of several factors to the live testing of zinc oxide arrester in site is analyzed, including the static electric coupling of strong electric fields around, the phase difference of the reference voltage, the harmonic components of operating voltage and the difference of continuous-running voltage and operating voltage. Certain measures to enhance the testing precision are put forward such as to shield the screen flange and the lead-down line, to take the secondary voltage of the hithermost TV or CVT＇s measure winding as a reference voltage and make compensation to it, to do harmonic analysis and compensation to the operating voltage, to make equivalents of the attester at different voltage levels based on its volt-ampere characteristics.