基于电弧功率测量的有载分接开关触点状态监测模型及仿真

有载分接开关(OLTC)在不中断电流的情况下通过改变绕组电压比来调节变压器的输出电压。作为电力变压器中唯一需要机械动作的部件，它的故障率一直居高不下。因此，OLTC的建模和状态监测对电力系统的正常运行具有重要意义。先研究了有载分接开关触点劣化机制，分析了引发触点接触电阻异常的典型原因，结果表明触点劣化会引起接触电阻的增...

Contact State Monitoring Model of On-load Tap-changer Based on Arc-power Measurement

The on-load tap changer (OLTC) adjusts the output voltage of the transformer by changing the winding voltage ratio without interrupting the current. As the only component that requires mechanical action in a power transformer, its failure rate has remained high. Therefore, OLTC modeling and condition monitoring are of great significance to the normal operation of the power system. This article first studies the contact deterioration mechanism of the on-load tap-changer, and analyzes the typical causes of abnormal contact resistance. The results show that contact deterioration will cause an increase in contact resistance, which will cause significant heating and power dissipation. The on-load tap changer model based on arc power proposed in this paper draws on the circuit breaker arc model, and uses the instantaneous differential power measured from the input and output ends of the transformer to calculate the arc power and energy related to OLTC operation. Average moving arc power and accumulated arc energy are good indicators to reflect the electrical wear of OLTC contacts. The simulation results show that the model based on arc power can accurately assess the electrical wear of the voltage contacts and determine the inspection or maintenance plan of the internal contacts.