通过电阻柜的瞬时电流与外加瞬时电压成正比。电阻柜是电子电路中应用数量多的元件,电阻柜是用电阻材料制成的有一定结构形式、能在电路中起电流通过作用的二端电子元件。阻值不能改变的称为固定电阻柜。阻值可变的称为电位器或可变电阻柜。理想的电阻柜是线性的.通常按功率和阻值形成不同系列,供电路设计者选用。电阻柜在电路中主要用来调节和稳定电流与电压,铝壳电阻柜可作为分流器和分压器,也可作电路匹配负载。
接头不松动,电阻柜内的连接线采用绝缘导线.不得有外露带电部分。电阻柜内的工作零线应通过接线端子板连接,与维护零线接线端子板分设;电阻柜的金属箱体、金属电器装置板以及箱内电器的不应带电金属底座、外壳等必需做保护接零,维护零线应通过接线端子板连接。动力电阻柜与照明电阻柜宜分别设置,如合置在同一电阻柜内,动力和照明线应分路设置。当电网运行不正常或者出现故障时,起到一种保护作用,限制故障电流的大小,电阻柜内部的电阻可以对电压起到一个阻尼作用,所以能够很地减少出现过电压的问题,以免对电器和电网造成一种损害,减少使用的寿命,电阻柜可以起到一个固定中心点电压的作用,提高了平安系数。
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