用于输电线路电晕损耗在线监测的金属化膜法可行性分析  

Feasibility Analysis of Metalized Membrane Method Applied to Monitor Corona Loss of Transmission Lines

作　　者：张琪[1] 刘海沧[1] 罗勇芬[1] 张源斌[1] 吴健[2] 白晓春[2] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]陕西电力科学研究院,西安710054

出　　处：《高电压技术》2011年第10期2398-2402,共5页High Voltage Engineering

摘　　要：为解决难以方便、有效地在线监测交、直流输电线路电晕损耗的问题,提出了适用于交、直流输电线路电晕损耗在线监测的金属化膜法。该方法在输电导线表面包裹一层薄的、一定长度的金属化膜,包裹薄膜朝外的一面是导电金属镀层,靠近输电导线的一面是绝缘材料层。在金属镀层和输电分裂导线间并联采样电阻。采样电阻将流过的泄漏电流转换为电压信号,该信号经无线或光纤传输至地面上的计算机。输电导线的电压经电压互感器或分压器变换后也传输至计算机进行采集。通过在计算机上编制软件计算电晕电流和损耗等数据,对薄膜处泄漏电流和首端电阻处泄漏电流测量结果进行相关系数分析、时延和单位长度泄漏电流比较等的研究,结果表明该方法对于测量电晕损耗是可行的。该方法具有实用性,不仅适用于空载和有载输电线路,也适用于交流和直流输电线路。The metalized membrane method, in which transmission line was coated by metalized membrane where the insulated layer was next to transmission line and mental layer was outwards, was applied to monitor the corona losses on AC/DC transmission lines online. The sampling resistance between transmission line and membrane could convert leakage current to voltage signal which would be sent to a computer by wireless telecommunications way or optical fiber transmission way. The voltage of transmission line would also be sent to a computer after converting by PT or voltage divider. The leakage current, corona loss, and other data could be calculated by a prepared program on the computer. The measurement results of the leakage current of the metalized membrane and the leakage current on the sampling resistance at the beginning of the transmission were compared, and the related coefficient, time de- lay and unit length leakage current were analyzed. Results prove that this new method is feasible to measure corona losses, and easy to realize monitoring online. This method can be practically applied to not only on-load and no-load lines, but also AC and DC transmission lines.

关 键 词：金属化膜法 电晕损耗 泄漏电流 在线监测 相关系数 时延 

分 类 号：TM75[电气工程—电力系统及自动化]