衬套
变压器
工程类
可靠性(半导体)
电压
电容器
马尔可夫链
马尔可夫模型
可靠性工程
电容感应
电子工程
汽车工程
控制理论(社会学)
计算机科学
电气工程
控制(管理)
机械工程
功率(物理)
人工智能
物理
机器学习
量子力学
作者
Omid Haghgoo,Yaser Damchi
标识
DOI:10.1016/j.epsr.2021.107573
摘要
Capacitor voltage transformer (CVT) is one of the most important instrument transformers widely used to prepare the voltage signal for control and protection equipment. The measuring accuracy of CVT plays an important role in the proper operation of the protection system. Therefore, maintaining the accuracy of CVT throughout its lifetime at the desired level is of great significance, and proper maintenance activities must be implemented regarding the equipment conditions. Evaluating the reliability of the CVT over its lifetime is necessary to determine the proper maintenance. Until now, no proper model has been suggested to evaluate the reliability of CVT. Therefore, this paper proposes a new Markov model to evaluate the reliability of CVT. To obtain the model, initially, a Markov model is presented for each subsystem of CVT including capacitor voltage divider (CVD), electromagnetic unit (EMU), and high voltage bushing. Then, by integrating these models, a 10-state extended Markov model is proposed for CVT. Finally, by combining similar states, a 3-state model including healthy, low-quality and failure states is obtained. The simulation results show that the second capacitive group in the CVD subsystem, and the compensating reactor in the EMU subsystem play a major role in the CVT performance.
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