求翻译：当母线失压后，延时（该延时大于第一组备自投的整组动作时间）跳开母联及机组电源开关，确认断开后再合外电开关是什么意思？

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After the generatrix loses presses, the time delay (this time delay is bigger than the entire group operating time which first group prepares turns oneself in) to rebound the mother to unite and the unit power switch, after confirmed the separation gathers the foreign news dispatch switch again

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When the bus after the loss of pressure, time delay (the delay is greater than the first group prepared to vote for the entire group operating time) and jump mother of the unit power switch, make sure switch off before closing foreign