CAJ | 학술논문

金属氧化物避雷器（metaloxidearrester，MOA）是电力系统过电压保护的主要装置，对MOA进行在线监测是保证电力系统安全运行的重要手段。监测MOA的运行状况主要是监测其阻性泄漏电流。针对目前几种MOA阻性电流提取方法存在的问题，根据A、B、C三相电压过零时流过避雷器的全电流与构成它的阻性和容性电流之间的相互关系，提出了一种新的阻性电流提取方法，并推导出了该方法的数学公式。最后分别建立了在系统电压正常和有谐波状态下的仿真模型，对该方法进行验证。结果证实了该方法能有效地滤除电网电压3次谐波和相间耦合电容产生的干扰，为MOA性能的判断提供了可靠的依据。
금속양화물피뢰기（metaloxidearrester，MOA）시전력계통과전압보호적주요장치，대MOA진행재선감측시보증전력계통안전운행적중요수단。감측MOA적운행상황주요시감측기조성설루전류。침대목전궤충MOA조성전류제취방법존재적문제，근거A、B、C삼상전압과령시류과피뢰기적전전류여구성타적조성화용성전류지간적상호관계，제출료일충신적조성전류제취방법，병추도출료해방법적수학공식。최후분별건립료재계통전압정상화유해파상태하적방진모형，대해방법진행험증。결과증실료해방법능유효지려제전망전압3차해파화상간우합전용산생적간우，위MOA성능적판단제공료가고적의거。
Metal oxide arresters （MOA） are the main over-voltage protection devices in power systems. The on-line monitoring of MOA is an important method to ensure the safety of power systems. The measuring of the resistive leakage current of MOA is the main methods of monitoring the conditions of MOA. According to the weakness of the existing methods used in extracting resistive current, a new extracting method based on the relationship between total current and itscomponent parts resistive current and capacitive current for resistive current of M0A at A,B,C three-phase voltage＇s zero-point was proposed, and the digital formula of this method was deduced. At last, the simulation models under normal and harmonic voltage conditions were established. The simulation testified that this method can eliminate not only the interference of the inter-phase coupling capacitance but also the third harmonic voltage of MOA. Through this method, we can judge the performance of MOA more reliably.