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| With the increase in electrical equipment in More/All Electric Aircraft, 270V dc power supply system will be needed. One method for DC interruption is forced current zero (FCZ). Based on FCZ technology with transverse-magnetic-field contact, the spiral-type contacts are designed. Experiments of different current are carried with the diameters being 30 mm, 40mm and 50 mm, when the arcing surface materials are Cu-W80 alloy and Cu-Cr50 alloy respectively. It is indicated by the experiment results that breaking capacity of vacuum interrupter and vacuum arc appearance are closely related to the electrode diameter and material. For the same size of electrode diameter, the breaking capacity in Cu-Cr50 is better than that in Cu-W80. With the electrode diameter increasing, the breaking capacity is better in lager diameter vacuum interrupter.When the arcing time is longer than 1 ms, the intensive burning arc occurs and affects the breaking performance of spiral-type contacts. If the DC-arcing stage is prolonged, the total arcing energy increases, which leads to lower breaking capacity. |
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| Keywords:vacuum arc; forced current zero; transverse magnetic field; breaking capacity; electrodediameter and material; arcing time |
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