填料对电弧触发器特性的影响

Effect of filler material on arc-trigger characteristic

以某型额定电流2kA电弧触发器为对象,建立了基于ANSYS平台的温升及弧前模型,分别对纯石英砂与水玻璃砂两种填料和绝热条件下的触发器进行了仿真计算.结果显示:填料对触发器稳态温升特性影响不明显,但会增加触发器弧前I2t值及延长弧前时间;触发器采用纯石英砂填料较采用水玻璃砂填料的弧前时间更短.最后制作了采用以上两种填料的触发器试验样品并进行了温升及弧前特性试验,试验结果与仿真分析结果一致,其中触发器采用纯石英砂填料比采用水玻璃砂填料弧前I2t值降低了21.1%,表明触发器采用纯石英砂填料更优.

Effects of silica sand and sodium silicate sand on temperature-rise and pre-arcing character istics of an arc-trigger which rated currnet is 2 kA was studied respectively by simulation modeling based on the platform of ANSYS. Simulation results show that filler material is not obvious in affect ing temperature-rise characteristic but the pre-arcing time and Joule-integral would be extended, and silica sand has shorter pre-arcing time compared with sodium silicate sand. Arc-trigger with different filler material were manufactured for temperature-rise and pre-arcing tests and the experimental re suits are in good agreement with simulation results, arc-trigger with silica sand is about 21. 1% lower than that with sodium silicate sand in pre-arcing Joule integral, indicating that the arc trigger with silica sand has better performance in fault current detection.