求翻译：单母线接线方案的可靠性较低，当母线检修或出现故障时，各回路必须全部停电，不能满足一、二类负荷对供电可靠性的要求，所以，不采用此种方案是什么意思？

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The single generatrix wiring plan reliability is low, when the generatrix overhaul or appears the breakdown, various return routes must completely power cut, cannot satisfy one, two kind of loads to the power supply reliable request, therefore, does not use this kind of plan

Single bus bar connection scheme of low reliability, maintenance or when the bus fails, the loop must be power, cannot meet the requirements of one or two types of load on power supply reliability, so, do not use this solution

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