Research on Condition Monitoring Method of Mechanical Characteristics of Low-Voltage Circuit Breaker
Hu Bokai1,2, Li Kui1,2, Niu Feng1,2, Zhao Chengchen1,2
1.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China; 2.Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China
Abstract As an important protective device in low-voltage distribution system, low-voltage circuit breaker is mainly used to cut off and connect load circuit and cut off fault circuit to ensure the system safe operation. The reliable operation of its internal mechanical components is very important to the operating performance of the low-voltage circuit breaker. With the increase of the number of operations, the mechanical characteristics of the circuit breaker gradually deteriorate, and eventually destroy the normal movement of the operating mechanism, and then cause the failure of closing and opening, and even affect the distribution system. In order to accurately monitor the mechanical characteristics of low-voltage circuit breaker, a condition monitoring method for mechanical characteristics of low-voltage circuit breaker based on the motion characteristics of operating mechanism is proposed. Firstly, according to the motion characteristics of the operating mechanism, the rotation characteristics of mechanism in the process of closing and opening are analyzed, and the characteristics that can reflect the performance of the operating mechanism are selected. Secondly, the effects of contact abrasion, mechanism abrasion and opening spring fracture on the performance of the mechanism are quantitatively analyzed, and the performance monitoring and diagnosis of mechanical parts are realized by monitoring the changes of characteristic quantities in real time. Finally, the influence of contact over-travel performance degradation on opening energy and mechanism performance is quantitatively calculated to realize the monitoring of contact overtravel state. The experimental results show that the proposed method can effectively monitor the state information of the mechanical components of low-voltage circuit breaker, realize the accurate evaluation of the contact overrange state, and provide a new method for the monitoring and diagnosis of the mechanical characteristics of low-voltage circuit breaker.
Hu Bokai,Li Kui,Niu Feng等. Research on Condition Monitoring Method of Mechanical Characteristics of Low-Voltage Circuit Breaker[J]. Transactions of China Electrotechnical Society, 2022, 37(13): 3317-3330.
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2022, Vol. 37 
