用相角差法判断金属氧化物避雷器性能优劣的研究

Performance Evaluation of Metal Oxide Surge Arrester with Phase Difference Method

金属氧化物避雷器在长期承受系统电压作用时会产生老化,导致阻性电流增加使其发热性能变差,所以需要定期对其性能进行检测,为此国内外学者提出了各种判断避雷器性能优劣的方法。笔者在分析避雷器工作原理的基础上,根据实际经验提出了用相角差法判断金属氧化物避雷器性能优劣的新方法。实验表明该方法能够更清晰、准确和方便地对避雷器性能优劣进行判断。

Metal Oxide Surge Arrester is one of the most important equipments in electric power system. Because MOA bears the system voltage all the time and ages, the resistance leakage current will increase and generate heat. The performance of MOA may become inferior. Whether its running status is good or not directly affects other equipments in system. So it is necessary to detect performance of MOA periodically. For this purpose, the scholars at home and abroad have brought forward various methods to judge MOA function superior or inferior. In the basis of analyzing MOA operating principle and be based on practical experience, the paper suggests a new method with using phase difference for judgment. The experiment shows that the method is more clear, accurate and convenient to carry out a judgment for function of MOA.