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| Research on the Topology of the Resistance-Capacitance Hybrid DC Circuit Breaker with Coupling Reactors |
| Cheng Xian1,2, Yan Dongdong1,2, Ge Guowei1,2, Bai Qinglin1,2, Qin Cong1,2 |
1. School of Electrical Engineering Zhengzhou University Zhengzhou 450001 China;
2. Henan Engineering Research Center of Power Transmission & Distribution Equipment and Electrical Insulation Zhengzhou 450001 China |
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Abstract DC circuit breaker is an important equipment for the control and protection of urban rail transit system. Its on-off reliability directly affects the operation safety of DC traction power supply system. In order to meet the urgent needs of large capacity high-speed segmentation and current limiting capacity. A resistance-capacitance hybrid DC circuit breaker with coupled reactor (CR-DCCB) is proposed. The primary and secondary windings of the coupled reactor are connected in series with the main branch and the vacuum switch branch, respectively. The structure can accelerate the current transfer process, and the resistive-capacitive elements are connected in series with the solid-state switch branch to limit the fault current peak. To verify the feasibility and effectiveness of the topology. First, the theoretical analysis of the coupling coefficient of coupling reactor and the primary and secondary winding inductance value of the influence of fault current transfer process and the influence of the peak value of fault current resistance capacity components, by improving the coupling coefficient and the primary and secondary winding inductance ratio to shorten the current transfer time, increase the resistance capacity components can limit the fault current peak value. Different from the traditional hybrid DC circuit breaker transfer principle, when the contacts are not separated, the current transfer can be realized by coupling reactor in the early stage. Since the contact separation time of the vacuum switch is in the late stage of the current transfer process, the vacuum switch belongs to less arc or no arc breaking, which can prolong its electrical life. Then, the CR-DCCB simulation model was established in Matlab/Simulink simulation software, and the influence law of coupling reactor parameters and resistance-capacitive elements parameters on current transfer process, current limiting effect and turn-off time of the whole machine was simulated and analyzed, and the optimal parameters of coupling reactor and resistance-capacitive elements were initially determined. Finally, based on the experimental platform of the research group, the experimental circuit under small current was built, and the preliminary experimental verification was carried out. The simulation results were compared and analyzed with the experimental results, and the reasons for the error between simulation and experiment were obtained. The simulation results show that when the inductance of the primary and secondary winding of the coupled reactor is set as 300μH and 50μH, and the resistance and capacitance elements are set as 0.1Ω and 50μF, the current transfer time can be shortened from 1.5ms to 0.5ms, the peak fault current is reduced by 47.1%, and the turn-off time is shortened by 1.9ms. The experimental results show that the current transfer time is shortened from 204μs to 124μs, and the peak fault current is reduced from 1 980A to 950A. Simulation results and experimental results are consistent rule, both verified the current transfer time as the primary and secondary winding inductance ratio increases with the shortened, but when the ratio is more than 10, current transfer time change is not obvious, because the problem of magnetic saturation, therefore when designing the coupling reactor need to attach importance to the influence of magnetic saturation, The conclusion of this paper provides a reference for the subsequent prototype development.
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Received: 03 September 2021
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2023, Vol. 38 
