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Appl. Sci. 2017, 7(6), 512; doi:10.3390/app7060512

Direct-Current Forced Interruption and Breaking Performance of Spiral-Type Contacts in Aero Applications

1
School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
2
Institute of Spacecraft System Engineering CAST, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Maffucci
Received: 21 March 2017 / Revised: 3 May 2017 / Accepted: 10 May 2017 / Published: 26 May 2017
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Abstract

This 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
Keywords: transient characteristics; breaking performance; forced interruption; spiral-type contact; intensive burning arc; contact materials; arcing time; breaking capacity transient characteristics; breaking performance; forced interruption; spiral-type contact; intensive burning arc; contact materials; arcing time; breaking capacity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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.

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