Abstract
High voltage circuit breakers are important protection and control equipment for the power grid. The defects and faults of the circuit breaker seriously affect the safety and stability of the power system. As the key component of the operating mechanism of the circuit breaker, the opening/closing coils contain a large amount of information about the operating status of the mechanism. In order to investigate the cause of the difference in the current waveforms, this paper analyzes the factors affecting the circuit breaker opening/closing coil current based on the actual high voltage circuit breaker, and distinguishes the characteristics of the current caused by the environmental difference and Structural difference. At the same time, the characteristics of coil current changes under four different types of mechanism defects are analyzed. These results lay the foundation for status evaluation of high voltage circuit breakers based on opening/closing coil current.
Highlights
As one of the most important power equipment in power system, circuit breaker plays the role of controlling the load current which is suitable for normal load current, and plays the protection role of carrying, breaking and closing abnormal current within the specified time
It includes the research on the influence of the change of the operating mechanism's opening and closing coil voltage, opening and closing coil circuit resistance and other parameters on the mechanical performance of the operating mechanism 7; the research on the on-line monitoring method of the mechanism's mechanical state based on the opening and closing coil current 8; the research on the relationship between the circuit breaker's opening and closing coil current waveform and mechanical defects, the extraction of the key characteristic quantity in the coil current waveform, and the establishment of the circuit breaker's normal monitoring system See diagnostic criteria for typical mechanical defects 9
Different environment, working conditions and circuit breaker structure will have a great impact on the current waveform of opening and closing, and the impact of these differences must be eliminated in the condition evaluation of circuit breaker
Summary
As one of the most important power equipment in power system, circuit breaker plays the role of controlling the load current which is suitable for normal load current, and plays the protection role of carrying, breaking and closing abnormal current within the specified time. The research shows that some mechanism fault information in the circuit breaker operation process will be reflected in some characteristics of the current curve of the opening and closing coil 2. One is to explore the relationship between the opening and closing coil current and the mechanical characteristics of the circuit breaker mechanism. The second is to study the fault of circuit breaker through the current of opening and closing coil. In this paper, based on the existing research, through the fault simulation on the actual circuit breaker, the characteristics of action current waveform are studied. This paper explores the factors that affect the current of the opening and closing coil of the circuit breaker, and compares and analyzes the current characteristics of the opening and closing coil in different fault states. The relationship between fault and current waveform characteristics is established, which lays a foundation for more precise circuit breaker condition assessment through coil current
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