secondary power supply meaning in Chinese

二次电源
副电源

The optimization of secondary power supply system in substation
变电所二次电源系统的优化
This dissertation is devoted to theoretical study and engineering practice on dc / dc converter of secondary power supply in hvdc power system
本文研究高压直流电源系统中的二次电源dc dc变换器。
There are two kinds of secondary power supply in high - voltage dc electric system , one is dc / dc converter that converts 270vdc to 28vdc , the other is static converter that converts 270vdc to 115vac / 400hz
它的二次电源有两种，一种是把270vdc变换为28vdc的直流变换器，另一种是把270vdc变换为115v 400hz交流电的静止变流器。