In polypropylene petrochemical plants power adjustable speed drives (ASDs) are normally used to drive extruder or pump machines required by this type of industrial process. Each one of these ASDs is fed by a dedicated converter transformer which supplies a diode-front-end rectifier in the input converter part of the ASD. In case one diode of the input rectifier is faulted and becomes short-circuited, the converter transformer can be subjected to a dynamic short circuit stress being higher than that due to a fault occurring just at transformer terminals: this phenomenon is called diode arc-back fault in technical literature. Simulations are carried out by means of EMTP-ATP software in order to show the effect of diode arc-back fault on the dynamic peak short circuit currents to which transformer windings are exposed

在聚丙烯石化厂中，通常使用功率可调驱动器（ASD）来驱动此类工业过程所需的挤出机或泵机。这些ASD中的每一个都由专用的转换器变压器供电，该转换器在ASD的输入转换器部分中为二极管前端整流器供电。如果输入整流器的一个二极管发生故障并短路，则转换器变压器所承受的动态短路应力会比仅在变压器端子处发生的故障所引起的动态短路应力高：这种现象称为二极管反弧技术文献中的错误。为了显示二极管反弧故障对暴露于变压器绕组的动态峰值短路电流的影响，通过EMTP-ATP软件进行了仿真。