相间变压器(Inter-Phase Transformers) 又称(IPT)，是一类特殊变压器，也称平衡电抗器。它是用以保证由不同相供电的多个换相组并联工作的电抗器。 具体出处见：《电源技术应用》2009年9月12卷第9期 曲学基 的《特种电源（一）》。
本文提出了电力变压器内部相间故障的分析方法，比较了距离继电器及其他后备保护在此故障时的灵敏度。
In this paper the method of analyzing the phase-to-phase faults in power transformers is presented. The sensitivities of distance relays and other back-up protections during the faults are compared.
随后利用电路理论对这种变压器的各种相间短路故障进行了分析，得到了各种故障情况下变压器高低压侧各相电流间的关系。
The relations between the currents of all phases and at both sides are drawn out by applying circuit theories and analyzing different inter phase short circuit faults of this kind transformer.
目前变压器相间后备保护对变压器匝间故障的灵敏度不高。
The transformer backup protection for phase- to- phase faults is not sensitive to the few turn turn- to- turn faults of transformer.
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