500kV变压器局放试验故障分析和处理  

Fault Analysis and Treatment of Partial Discharge in 500 kV Transformer

作　　者：彭非[1,2] 程林[1,2] 房体友[2] 吴义华[2] 詹浩[2] 

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]国网电力科学研究院武汉南瑞有限责任公司,武汉430074

出　　处：《高压电器》2015年第12期190-195,共6页High Voltage Apparatus

摘　　要：出厂短时感应耐压试验中,某500 kV电力变压器在680 kV电压时出现局放量严重超标事故。事故后,对变压器分阶段取油样分析;同时检查接线和试验设备后进行诊断性试验。根据油样分析结果和试验现象初步判定为变压器内部故障。随后吊心检查发现高压出头最外侧绝缘围屏和调压引线绝缘木螺杆等部位均有放电痕迹。通过对放电部位及周边电场情况的仿真计算分析,明确放电路径;同时结合试验现象,确定该故障是由于该变压器存在设计缺陷和采用低绝缘强度的绝缘件引起的。针对该事故,提出绝缘件更换和设计优化的维修处理方案。事故分析和处理方案能够为后续电力变压器设计和制作工艺的完善提供依据。Partial discharge of a 500 kV power transformer seriously exceed under 680 kV in routine ACSD test. After the accident, phased oil sampling analysis is taken to the transformer, the diagnostic tests are carried out after check wiring and test equipment. The oil sample test and analysis results indicated the fault of transformer is internal fault. Subsequently, the high-voltage head hanging core examination reveals the outermost insulation and regulated lead insulation wood screws and other parts have traces of discharge. Through the discharge site and the surrounding electric field simulation analysis, clear the discharge path, combined with experimental phenomena, determines that the failure is caused by a design flaw of the transformer and low dielectric strength of the insulation member caused. The corresponding maintenance treatment program is proposed. The accident analysis and processing programs can provide proposals for improving the follow-up of power transformer design and production process.

关 键 词：变压器 短时感应耐压试验 局部放电 螺栓 

分 类 号：TM407[电气工程—电器]