The output isolation transformer of UPS power frequency machine is strictly an indispensable component of its inverter, without full isolation effect, because there is no isolation in the bypass and zero line.

科士达UPS电源工频机的输出隔离变压器严格讲是它逆变部分不可或缺的组件，没有全隔离效果，因为旁路无隔离，零线无隔离。