EMUs low pressure power supply system

The utility model provides a EMUs low pressure power supply system, preferential power supply generating line is by battery direct power feeding BD, preferential 1 way BN1 of power supply of non - and preferential 2 way BN2 of power supply of non - are supplied power by the machine that charges, emergent load setting is on preferential power supply generating line, redundancy load 1 and 2 is supplied power with the load 2 tunnel that non - has priority by the power supply 1 tunnel that non - has priority respectively, all the other nonredundancy loads press the preferential load of electricity capacity average allocation to non - two on the road, set up accumulator switch simultaneously, when 1 tunnel non - has priority breaking down of load generating line, whole loads on this circuit are all lost, this moment vehicle service on buses or trains personnel accessible accumulator switch, convert the nonredundancy load on this circuit by the power supply of preferential power supply generating line to, as long as there have the way of the preferential power supply of 1 tunnel non - to be normal, redundant load just can normally be worked, can ensure all load functions does not lose, all system's homoenergetics are normally worked, the redundancy of EMUs low pressure power supply line, low pressure power supply line fault prevents owing to causing EMUs paralysed, EMUs reliability of operation and punctuality nature have been improved.