DC power distribution system

A DC power distribution system comprising:

• a transformer configured to convert an AC power inputted to the transformer into an AC power at a different voltage and output the AC power obtained by the conversion;
• a rectification device configured to convert the AC power outputted from the transformer into a DC power and output the DC power;
• a DC bus through which the DC power outputted from the rectification device flows;
• a plurality of DC branch lines branching off from the DC bus;
• an AC interrupting portion connected to an input side of the transformer;
• a first DC interrupting portion connected between the rectification device and the DC bus;
• and
• a plurality of second DC interrupting portions respectively provided to the plurality of DC branch lines, wherein
• an interrupting-operation time for each second DC interrupting portion is set to be shorter than an interrupting-operation time for the AC interrupting portion and an interrupting-operation time for the first DC interrupting portion, and
• an inductance value of a short-circuit impedance of the transformer is set to a value at which current that flows to the rectification device when short-circuit current flows in the DC power distribution system can be limited to take a value not larger than a maximum current value permitted for the rectification device.