【填空题】
18.应急电源输出电压低应如何处理？*论述题*___
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答案
处理方法：首先检查电源箱三相电压是否正常，之后检查变压器B2初级三相电源是否缺相，如缺相检查引线是否脱落、变压器接线是否脱掉、输入接线排处是否缺相[。如以上正常，检查输出电流，如输出电流过大，说明负载超载，应减载。检查变压器B2次级输出电压，空载时约为40．3V，满载时约为38V，如变压器次级输出电压正常，检查整流模块V2，断电将V2从电路中拆开，用万用表测量V2内部二极管是否有断路。
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