数字化变电站电子式互感器渐变性故障诊断方法研究  

Diagnosis of soft fault of electronic transformer in digital substation

作　　者：王洪彬[1,2] 唐昆明[1] 徐瑞林[2] 朱小军[2] 李筱婧 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044 [2]重庆市电力公司电力科学研究院,重庆401123 [3]四川省超高压运行检修公司南充中心,四川南充637100

出　　处：《电力系统保护与控制》2012年第24期53-58,共6页Power System Protection and Control

摘　　要：目前对电子式互感器的在线监测和故障诊断还处于起步阶段,尤其对于渐变性故障诊断的研究较少。从系统元件物理电气特性出发,构建了输电线路和变压器的电流观测器模型,对观测器输出与电子式互感器输出值进行比较,将由此构成的残差故障信息来诊断互感器渐变性故障。在此基础上,进一步引入网络图论的诊断机制对故障源辨识定位。通过仿真验证了观测器模型的正确性和故障诊断方法的有效性。该方法不受网络运行方式变化的影响,可在无附加硬件设备、互感器不停电、不脱网的条件下,实现电子式互感器的在线监测和故障诊断。At present, the research on on-line monitoring and fault diagnosis of electronic current transformer （ECT） is in the initial stage, especially for the soft fault diagnosis. Based on the physical electrical characteristics of system components, the current observer models of transmission line and transformer are established. The observer outputs and ECT outputs are compared to constitute the residual for the diagnosis of soft fault, meanwhile the network graph theory is used to locate fault source. The simulation results have verified the correctness of the proposed observer models and the validity of the proposed fault diagnosis method. The method is not affected by the mode change of network operation, and could realize the on-line monitoring and fault diagnosis under the condition of no additional hardware, ECT without power failure and online.

关 键 词：电子式互感器 故障诊断 残差 阈值 故障定位 

分 类 号：TM76[电气工程—电力系统及自动化]