Direct-Current Forced Interruption and Breaking Performance of Spiral-Type Contacts in Aero Applications
AbstractThis paper analyses the transient characteristics and breaking performance of direct-current (DC) forced-interruption vacuum interrupters in 270 V power-supply systems. Three stages are identified in forced interruption: the DC-arcing stage, current-commutation stage, and voltage-recovery stage. During the current-commutation stage, the reverse peak-current coefficient k, which is a key design factor, is used to calculate the rate of current at zero-crossing (di/dt). MATLAB/Simulink simulation models are established to obtain the transient characteristics influenced by the forced-commutation branch parameters and the coefficient k. To study the breaking performance of spiral-type contacts, experiments are conducted for different contact materials and arcing times for currents less than 3.5 kA. During the DC-arcing stage, a locally intensive burning arc is observed in the CuW80 contact; however, it is not observed in the CuCr50 contact. On examining the re-ignition interruption results of the CuW80 contact, the intensive burning arc is found to be positioned within a possible re-ignition region. When the arcing time is longer than 1 ms, the intensive burning arc occurs and affects the breaking performance of the spiral-type contacts. If the DC-arcing stage is prolonged, the total arcing energy increases, which leads to a lower breaking capacity. View Full-Text
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Huo, W.; Wu, J.; Jia, B.; Chen, M.; Ma, S.; Zhu, L. Direct-Current Forced Interruption and Breaking Performance of Spiral-Type Contacts in Aero Applications. Appl. Sci. 2017, 7, 512.
Huo W, Wu J, Jia B, Chen M, Ma S, Zhu L. Direct-Current Forced Interruption and Breaking Performance of Spiral-Type Contacts in Aero Applications. Applied Sciences. 2017; 7(6):512.Chicago/Turabian Style
Huo, Wenlei; Wu, Jianwen; Jia, Bowen; Chen, Mingxuan; Ma, Suliang; Zhu, Liying. 2017. "Direct-Current Forced Interruption and Breaking Performance of Spiral-Type Contacts in Aero Applications." Appl. Sci. 7, no. 6: 512.
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