多选题:在下列哪几种情况下,用电单位宜设置自备电源?( )

题目内容:
在下列哪几种情况下,用电单位宜设置自备电源?( ) A.需要设备自备电源作为一级负荷中特别重要负荷的应急电源时
B.所在地区偏僻,远离电力系统,设备自备电源经济合理时
C.设备自备电源较从电力系统取得第二电源经济合理时
D.已有两路电源,为更可靠为一级负荷供电时

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