基于Simulink的避雷器在线监测方法研究

Research on On-line Monitoring Method of Arrester Based on Simulink

针对目前10kV金属氧化锌避雷器在线监测方法中,对绝缘老化反应不灵敏、容易受到外界干扰、误报率高等问题,提出一种改进的阻性基波电流法。该方法通过滤波器模块作为外界谐波抑制主要方法,加以采样模块、波形变化模块等组成的阻性电流基波提取电路,可以减小系统谐波等对检测结果的影响,并且能够实时的监测阻性基波电流值。经Simulink的仿真环境下验证表明,由阻性电流基波法得到的基波电流误差小,稳定性高,在根本上解决了在线监测中误报率高的缺陷,对完善避雷器在线监测技术有着深远的意义。

A modified fundamental resistance current method is proposed for the On-line monitoring of 10 kV Metal Zinc Oxide Arrester（ MOA）,which is insensitive to the aging of insulation,susceptible to external interference and high false positive rate. This method takes the filter module as the main method to suppress the external harmonic,through fundamental resistance current sampling module,the waveform changes module extraction circuit,the system can decrease the effect of harmonic on the test results,and can monitor the real-time value of the resistive component. The simulation environment of Simulink shows that the fundamental current error obtained by resistance current fundamental wave of small,high stability,a fundamental solution to the defects of high false alarm rate in on-line monitoring,to improve the online monitoring technology of arrester has far-reaching significance.