利用含水量预测模型的电容型设备绝缘受潮故障预警方法.pdfVIP

高电压技术 第37卷 第 6期 201i年6月30日 High Voltage Engineering，Vo1．37，No．6，June 30，2011 利用含水量预测模型的电容型设备绝缘受潮故障预警方法 王永强，华晶晶，刘晓飞 (华北电力大学电气与电子工程学院，保定071003) 摘 要：电容型设备是重要的输变电设备，其可靠稳定运行是保障电力系统安全生产的重要因素。为此，以电容 型设备常见的受潮故障作为研究内容，研究了其故障程度表征情况和预警方法。基于虚拟仪器技术，采用高速同 步数字化测量技术，开发一套高精度电容型设备绝缘特性测试系统；提出基于真实设备本体的电容型设备受潮故 障模型设计方案，对电流互感器人为设置受潮故障；应用绝缘特性测试系统测试电流互感器的受潮故障特性，获得 水分质量浓度与介质损耗因素tan8、泄漏电流、阻性电流及电容量的关系曲线，探索不同严重程度的绝缘受潮故障 预警值。最后根据实验数据建立了tan8对水分质量浓度的预测模型，得到了故障设备水分质量浓度的发展路线和速 率，并通过实例分析验证了将tam作为特征量，绝缘油中水分质量浓度为阈值进行电容型设备故障预警的可行性。 关键词：电容型设备；在线监测；介质损耗因素；故障预警；预测；受潮故障 中图分类号：TM855 文献标志码：A 文章编号：1003—6520(2011)O6—1355—07 Insulation Damp Fault Warning Methods of Capacitance Equipments Using Water Content Prediction Model WANG Yong—qiang，HUA Jing—jing。LIU Xiao—fei (College of Electrical Electronic Engineering，North China Electric Power University，Baoding 071003，China) Abstract：Taking common damp faults of capacitive equipment as research contents，we studied its fault degree char— acterization and warning methods．With virtual instrument technique and high—speed synchronous digital measure— ment technology，we developed a set of test system for insulating properties of high precision capacitance equip— ment，proposed a design scheme of capacitance equipment damp fault model based on real equipment，and set damp fault artificially for current transformer．Moreover，we applied the test system tO test the damped insulating proper— ties of the current transformer and obtain the micro water content of insulating oil and tan6，discharge current，re— sistance of current，and capacitance relation curves，and explored the insulation damp fault early warning value．Ac— cording tO the experimental data，we established a prediction model，and obtained th