10 kV SLWL开关站油浸式配电变压器诊断与预防维护技术

Diagnosis and Preventive Maintenance of Oil immersed Distribution Transformers in 10 kV SLWL Switchyard

以上海市某10 kV SLWL开关站为例,针对油浸式配电变压器实施了故障诊断与预防维护技术。通过先进的在线监测、数据分析和故障诊断模型的应用,成功检测并准确诊断了过电流、过温、局部放电和绝缘油微水含量增加等故障,检测率高达94%~100%,响应时间在2.5~4.8 s。项目实施后,年度故障率从5.2%下降到1.1%,MTBF从850 h增加到2100 h,维护次数减少35%,年度维护成本降低38%;此外,因设备故障引起的停电次数从10次减少到2次,停电时长从50 h减少到7 h,供电可靠率从99.5%提高到99.95%。应用结果显示,故障诊断与预防维护技术在提升设备可靠性和供电稳定性方面具有显著效果,值得推广。

This work carried out a case practical application of fault diagnosis and preventive maintenance techniques to the oil-immersed distributing transformers in a 10 kV SLWL switching station in Shanghai.By utilizing advanced online monitoring,data analysis,and fault diagnosis models,various types of faults such as overcurrent,overheating,partial discharge,and oil moisture content increment,were successfully detected and diagnosed,with high detection rates and response time ranging within 94%~100%and 2.5~4.8 s,respectively.The case application achieved reduction in annual failure rate from 5.2%to 1.1%,increase in MTBF from 850 h to 2100 h,reduction in maintenance frequency by 35%,reduction in annual maintenance cost by 38%,reduction in equipment fault-induced power outage count from 10 to 2,reduction in power outage duration from 50 hours to 7 hours,and increase in power supply reliability rate from 99.5%to 99.95%.Therefore the adopted fault diagnosis and preventive maintenance techniques are potentially effective in improving equipment reliability and power supply stability,and deserve further application.