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.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第24期53-58,共6页
Power System Protection and Control
关键词
电子式互感器
故障诊断
残差
阈值
故障定位
electronic transformer
fault diagnosis
residual
threshold
fault location
