中压交联电缆线路绝缘状态诊断研究

本文分析了中压交联电缆线路绝缘老化的机理，分析了电缆线路绝缘有缺陷后有关电气特征量的变化规律，选取了运行不同年限的电缆线路在现场做 0.1Hz交流耐压试验、局部放电试验和介损测量，通过大量的实测数据，提出中压交联电缆线路绝缘状态诊断判据，给出相应维护检修策略。列举了35kV 莲小线、10kV莲四线、35kV龙矿线电缆绝缘诊断实例来说明基于0.1Hz电压下的绝缘诊断方法的有效性。

Research on Insulation Diagnosis of Medium-voltage Crosslinked Cable Lines

This paper analyzes the mechanism of insulation ageing in medium-voltage crosslinked cable lines and variation of elctric character value when there are defects in cable line insulation. We selected cable lines that have different operation lifes and conducted 0.1Hz AC withstand voltage test, PD test and dielectric loss measurement. Through a large number of testing data, we propose criteria for diagnosing insulation state of mediun-voltage crosslinked cable lines and provides relevant maintenance and service strategies. It illustrates the effectiveness of inslation diagnosis under 0.1Hz voltage by enumerating examples of cable's insulation diagnosis of 35kV Lianxiao line, 10kV liansi line,35kV longkuang line.