The transformer may be applicable to either four- phase transmission system or AT power supply system in electric railways.
三相变四相电力变压器是一种新型平衡变压器，由此可以实现四相输电方式，也可以用于电气化铁道的AT供电方式。
AT power supply system with protection wire is more complex than other power supply systems in framework, so it has more faults than others.
带保护线的AT供电方式较其他供电方式在结构上更为复杂，故障率也比其他供电方式更高。
Because of the better structure and balance characteristic compared with other transformer used in electric railway, the three-phase to four-phase transformer can apply to AT power supply system.
与其它牵引变压器相比，三相变四相变压器具有较好的结构和平衡特性，可以用于电气化铁路AT供电。
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