zero load meaning in English

零位负荷
零载荷
无载，空载

As the object of the task , ups inverted by igbt with constant current adjusting and high power factor ( abbreviated to ups with constant current ) is known from others by : 1 , high power factor as to the power system 2 , constant current output at different level according to the demand ( from zero load to rating load )
作为本课题的主体，高功率因数恒流调光igbt逆变ups (以下简称恒流ups )具有其区别于普通ups的独特之处： 1 、实现电网侧的高功率因数2 、电源输出为分级恒流(从零负载到额定负载) 。