触头材料与环境气氛是影响气密性高压直流继电器灭弧性能的关键因素.在直流电压200～500 V、电流40～150 A的条件下, 对CuW50、CuW60、AgW60和Cu 4种触头材料开展了N2、CO2等6种环境气氛下的电接触试验, 并研究了其分断燃弧时间.结果表明, 6种气氛中O2分断燃弧时间最长;随电压、电流增大, N2燃弧时间呈增大趋势, CO2呈减小趋势.4种试验触头材料中, AgW60燃弧时间最长, 而Cu燃弧时间最短.%The contact material and surrounding atmosphere are the key factors that affect the arc-extinguishing performance of the sealed high-voltage DC relay.In this paper, under the conditions of DC voltage of 200～500 V and current of 40～150 A, the electrical contact experiments of four kinds of contact materials, CuW50, CuW60, AgW60 and Cu, were carried out in six kinds of surrounding atmospheres such as N2 and CO2, and the breaking arc duration was studied.The results indicate that the breaking arc duration in O2 is the longest, and with the increase of voltage and current the arc duration in N2 tends to increase and that in CO2 shows a decreasing trend.AgW60 has the longest arcing time and Cu the shortest, of the four tested contact materials.
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