main power supply meaning in English

电力网供电
主电源

The large amounts of power distribution networks take on the basic task of mains power supply to the widespread consumers
配电网量大面广，担负着直接为广大用户供电的任务。
Ideally suited for use in industrial and commercial applications such as switch mode power supplies and energy storage circuits small size , long life , very high voltage current , low esr and impedance , main power supply design and applications , tol
理想的适用于工商业界应用,如交换式主电源供应与储能电路,小尺寸,长寿命,非常高的电压电流,低esr及阻抗的应用