transformersn.变压器名词transformer的复数形式.transformern.变压器transformer noload losses变压器空载损耗transformer voltage ratio变压器电压比transformer-type ammeter互感器式安培计transformer type selection变压器选型transformer testing system变压器测试系统transformer reactive power变压器无功功率transformer underload trip变压器欠载跳闸装置transformer impedance drop变压器阻抗电压transformer-ratio bridge变压比电桥transformers impulse tests变压器冲击试验