线路电子式互感器渐变性故障诊断方法

目前对于电子式互感器渐变性故障在线诊断的研究较少。针对线路电子式互感器,从元件物理温度特性出发,构建线路电子式互感器电流电压漂移偏差故障和变比偏差故障数学模型。利用线路光纤差动保护装置采集的双端6个电流量及本端4个电压量,建立了线路电子式互感器渐变性故障诊断判据,通过将保护装置输出的电流电压值进行纵向及横向比较分析,能够快速准确地查找出故障互感器。该方法无附加硬件设备,在电子式互感器不停电、不脱网的条件下,可在现有保护装置上实现电子式互感器故障的在线诊断,通过Matlab仿真验证了该方法的正确性和有效性。

Diagnosis Method of Soft Fault of Line Electronic Transformer

At present,the research on on-line diagnosis of electronic transformer soft fault is rarely seen.Aiming at line electronic transformer,the current and voltage models of the drift bias fault and transformer bias fault is established based on the physical temperature characteristics of components.The double terminal six current and single terminal four voltage of line fiber differential protection are used to set up the electronic transformer soft fault diagnosis criterions,the output current and voltage of double protection device are compared with vertical and horizontal to find the fault electronic transformer.The method could realize on-line fault diagnosis of electronic transformer on existing protection under the condition of no additional hardware and ECT without power failure and online.Matlab simulation result shows that the method is corrected and validated.