CuW触点在不同环境气氛下燃弧时间和侵蚀实验研究

Arcing Duration and Erosion of CuW Contact Under DC Load and Different Surrounding Atmospheres

密封开关装置中的环境气氛对降低燃弧时间和触点侵蚀有重要影响。为了更好地了解气氛对燃弧时间和触点侵蚀的影响,文中利用触点模拟装置,在直流电压200~500 V,阻性负载电流40~150A,环境气氛为Air、N_2、CO_2、O_2条件下对CuW70触点开展实验研究。结果表明当电压增大时,不同气氛的分断燃弧时间顺序发生变化,O2总是具有最长的分断燃弧时间,在200~300V的情况下,N_2的分断燃弧时间比CO_2的更短,而在400~500V的情况下,CO_2的分断燃弧时间比N_2的更短。实验结果还表明阳极在所有气氛中都为质量损失,阴极在Air和N_2中为质量损失,但在CO_2和O_2中质量增加。

Surrounding atmospheres in hermetically sealed switching devices significantly affect their arc extinction and electrical endurance. To better understand the effects of atmosphere on arcing duration and erosion of the contact, experiment was conducted with the CuW70 contact material under the DC supply voltage of 200～500 V, the resistive load current of 40～150 A, and the respective surrounding atmospheres of air, N2, CO2 and O2. It was found that the sequences of breaking arc duratiom for these atmospheres changed with the supply voltage. O2 always had the longest breaking arc duratiom, and N2 showed shorter breaking arc duratiom than COs in the case of 200～300 V, but CO2 showed shorter breaking arc duratiom than N2 in the case of 400～500 V. Experiment also indicated the anodes suffered mass loss in all atmospheres,however,the cathodes suffered mass loss in air and N2 but gaied mass in CO2 and O2.