摘要:
多电极运行是提高直流电弧加热器大电流运行可靠性的有效途径。通过对双阴极/单阳极和双阴极/双阳极电弧加热器多电极运行调试,探寻了镇定电阻匹配方式、气体流量和电流等参数对多电极中各电极电弧电流分配特性的影响。结果表明,镇定电阻匹配方式是影响多电极稳定运行的关键因素,气体流量和电流等运行参数对电弧电流分配影响较小;对于双阴极/单阳极电弧加热器,只有在内外阴极同时连接镇定电阻,并且满足一定电阻差时,才能将电弧电流稳定分配到各个子电极上;对于双阴极/双阳极电弧加热器运行时,不论内外阳极是否连接镇定电阻,只要内外阴极连接镇定电阻,电弧电流均可稳定分配到各个子电极,并且电流分配比例可根据镇定电阻的匹配方式进行调节;多电极运行时,宜选用电流分配均匀,电能损耗小的电阻匹配方式。
Abstract:
The safely operation with multiple electrodes is important for arc heater running re-liability with large arc current.The influence of ballast resistor settings,gas flow and arc current were observed for arc heaters with a pair of cathodes matching single anode,and with a dual elec-trodes separately.Results show that the ballast resistor settings is the key factor for division of current between electrodes,and the operation parameters such as gas flow and current are insen-sitive with the arc current distribution.For arc heater with a pair of cathodes and single anode, ballast resistors with the certain difference connected simultaneously to inner and outer cathodes is a necessary for division of current between cathodes.For arc heater with a dual electrodes,the division of current between each electrode could be successfully achieved so far as the ballast re-sistors connected to cathodes.And the different current distribution proportions could be a-chieved by adjustment of the ballast resistor.When arc heater operated in multiple electrodes mode,the ballast resistor settings with lowest power loss and uniform division of current should be selected.
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