接触网绝缘子泄漏电流在线监测装置设计

Design of on-line monitoring device of catenary insulator leakage current

为有效地预测接触网绝缘子污秽水平,提高接触网运行安全可靠性,设计了一种基于ARM的接触网绝缘子泄露电流在线监测装置。通过传感器采集泄露电流和环境湿度预测绝缘子污秽水平,从而判断绝缘子是否应该进行清洗。选取了FQBJ—25/8—760P复合绝缘子为研究对象,在饱和空气湿度下,利用在线监测装置进行人工污秽实验。利用实验数据拟合污秽水平与泄漏电流的关系曲线,为确定接触网绝缘子泄漏电流在线监测装置的预警值提供指导。基于污闪发展三区段思想,提出接触网绝缘子安全运行区、污秽清理区及危险区。

To effectively predict insulator contamination levels, improve operational safety and reliability of catenary, an on-line monitoring catenary insulator leakage current device is developed , which is based on ARM. The device judges whether insulators should be cleaned by the contamination levels, which is predicted by leakage current and ambient humidity. Select a composite insulators of FQBJ-25/8-760P as research object, carry out artificial pollution test using on-line monitoring device, under satur-ated air humidity. Fitting relation curves of contamination level and leakage current using experimental datas, and provide guidance to confirm alarm value of catenary insulator leakage current on-line monitoring device. Based on three-stage idea of pollution flashover, propose safe operating area, filth cleaning area and danger area of catenary insulator.