超高圧受電新幹線ATき電方式用三巻線変圧器の開発

概要

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Auto-transformer feeding system is standard equipment for power supply to high-speed trains on the AC electrified Shinkansen lines in Japan.Feeder side voltage of feeding transformer is 60kV on Shinkansen lines, and power supply to vehicle by an auto-transformer is stepped down from 60kV to 30kV. In the present autotransformer feeding system in which the feeder side of the feeding transformer is not grounded, the insulation level on the feeder side of the substation is set at class 60.For the purpose of economy on the substation power system, it is effective to adopt a three-winding transformer which makes the insulation level on the feeder side equal to 1/2 of the present value. Therefore, authors propose a new three-winding transformer connection that permits neutral direct grounding for the substation receiving extra-high voltage.This paper describes a theoretical study and results of a test on a mini-model of the proposed new type transformer connection. According to the result of examination, impedance characteristics of the transformer satisfy the terms of insulation level reduction. There are good prospects that the new type transformer can be introduced in practical use.
社団法人電気学会の論文