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Date of Publication:2017-01-01

Journal:高电压技术

Volume:43

Issue:12

Page Number:3929-3937

ISSN No.:1003-6520

Abstract:The heating process in the anode by vacuum arc is one of key physics
   process influencing the interruption capacity of vacuum circuit
   breaker(VCB). Consequently, we established an anode thermal model
   considering the Joule heating, thermal conduction, and radiation. Then
   we used the heat flux density(HFD) on the anode surface calculated by a
   previous numerical simulation of vacuum arc as a boundary condition, and
   adopted the sensible heat capacity method to analyze the latent heat.
   Moreover, we studied the anode heating process and post-arc cooling
   process during the current interruption of VCB, and analyzed the
   evolution of anode temperature, molten region size, vapor pressure, and
   vapor flux density. The investigation shown that:1) the maximum
   temperature of anode has about 2~3 ms time delay compared with peak
   current. 2) With the typical arcing parameters, the maximum anode
   temperature and molten region appear at 8 ms. The anode temperature
   decreases rapidly after the occurrence of arc. The molten region
   disappears after 12 ms. 3) With the increase of the peak arc current,
   the temperature at anode center rises and the existing time of molten
   region extends. Because the vapor pressure and vapor flux density on
   anode surface are high after the occurrence of arc, the recovery of
   dielectric strength will be influenced.

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