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
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引用本文:袁文海1,郑 斌1,缪 刚1,宋昆峰1,杨 莉1,李 翔2, 梁凯彬2.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[J].计算技术与自动化,2022,(1):41-47
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袁文海1,郑 斌1,缪 刚1,宋昆峰1,杨 莉1,李 翔2, 梁凯彬2 (1.国网新疆电力有限公司乌鲁木齐供电公司新疆维吾尔自治区 乌鲁木齐 8300112.湖南大学电气与信息工程学院湖南 长沙 410082) 
中文摘要: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大,从而会引起显著的发热和功率耗散。提出的基于电弧功率的有载分接开关模型借鉴了断路器电弧模型,利用从变压器输入和输出端测得的分接变压器的瞬时差动功率来计算与OLTC运行相关的电弧功率和能量。平均移动电弧功率和累积电弧能量是反映OLTC触点电磨损的良好指标,仿真结果表明,电弧功率模型能准确评估有电压触点的电磨损,确定内部触点的健康状态,为现场人员制定检查或维护计划提供依据。
中文关键词:有载分接开关  电弧功率测量  状态监测  电触点磨损
 
Contact State Monitoring Model of On-load Tap-changer Based on Arc-power Measurement
Abstract: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.
keywords:on load tap changer  arc power measurement  condition monitoring  contact wear
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