大容量抗感应电压输电线路绝缘电阻测量装置设计与开发

何良兴++于校彬++文庄顺

DOI：10.16660/j.cnki.1674-098X.2017.14.051

摘 要：该文针对高感应电压以及山区大雾或覆冰等恶劣条件，常规绝缘电阻测试仪无法对线路绝缘准确测量的不利情况，设计了一款大容量抗感应电压输电线路绝缘电阻测量装置，通过实验电路设计原理分析以及数学理论计算，该装置通过滤波、反馈、控制单元、逆变等模块的设计达到高感应电压或大泄漏电流状态下输电线路的绝缘电阻测量。通过实验测试表明，该文所开发的装置测量电阻的精度保证在2级，满足输电线路绝缘阻抗的测量精度要求，可应用于实际线路的绝缘阻抗测量并带来可观的社会经济效益和直接经济效益。

关键词：高感应电压 绝缘电阻 绝缘测量 大容量抗感应电压

中图分类号：TM85 文献标识码：A 文章编号：1674-098X（2017）05（b）-0051-04

Design of Insulation Resistance Measuring Device for High Capacity Anti-induced Voltage Electric Transmission Line

He Liangxing Yu Xiaobin Wen Zhuangshun

（Guilin Power Supply Bureau，Guangxi Power Grid Co.，Ltd.， Guilin Guangxi， 541002， China）

Abstract：In view of the adverse condition of the high induction voltage and severe weather such as dense fog and ice coating in mountain areas， which make the conventional insulation resistance tester can not accurately measure the line insulation，this paper introduces insulation resistance measurement device for high capacity anti-induced voltage electric transmission line.With the analysis of the experimental circuit design principle ，the calculation of the mathematical theory and the design of filter， feedback， control unit， inverter and other modules，insulation resistance measurement of transmission line under high induced voltage or large leakage current can be realized.Through experimental tests，it shows that the precision of the measuring resistance of the device is guaranteed at the level of 2，which meet the measurement accuracy of insulation impedance of transmission line.It means that this device can be used to measure insulation impedance of actual line and can bring considerable social and direct economic benefits.

Key Words：High induction voltage； Insulation resistance； Insulation measurement； High capacity anti-induced voltage

随着电网系统快速发展，输电线路电压等级越来越高，输电距离越来越远，线路同杆平行架设、交叉跨越情况越来越多，线路间相的感应电压会越来越高[1]。其中，因受其他运行线路的影响，在处于冷备用状态的线路上会产生感应电压，其值与线路电压等级、长度以及其他线路的相互架设结构有关，影响严重者可达数十千伏。在过高的感应电压下，无法对线路绝缘电阻进行准确测量，此外，在多雾或覆冰环境条件下，线路直流泄漏电流极大，绝缘电阻明显降低。在此条件下，额定短路电流仅为5 mA的常规绝缘电阻测试仪无法对线路绝缘准确测量。国内外对高感应电压线路测量绝缘电阻的考虑是限制感应电压大小，目前已研制出用于降低线路感应电压的电容装置，可将感应电压限制在较低的范围内[2]。……