Abstract
The arc generated during the breaking of DC switchgear is the key to determine its breaking performance and electrical life. Because there is no natural zero crossing, it is difficult to extinguish the DC arc. Considering the influence of transverse magnetic field and contact breaking speed on DC arc, the self-designed contact simulation test device based on eddy current repulsion mechanism is used to carry out breaking test under resistive load. The arc waveform is collected by data acquisition system and processed to obtain arc duration and arc energy. At the same time, the arc image is collected by high-speed camera and processed to obtain the arc area. The effects of magnetic field strength and breaking speed on arc duration, arc energy and arc area are studied. The results show that with the increase of magnetic field strength and breaking speed, the arcing duration and arc energy show a power function downward trend. When the magnetic field is large, the arc area does not appear a relatively stable stage, and its growth rate increases with the increase of breaking speed. Adopting appropriate transverse magnetic field and breaking speed can greatly reduce arc duration and arc energy, reduce contact erosion and prolong service life of electrical appliances.KeywordsDC arcMagnetic field strengthBreaking speedArc characteristic parameters
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