It was decided to carry out demonstration tests at a substation for
conventional railways, so we fabricated transformers with the new
connection for verification (Fig. 4). After the basic characteristics
of the transformers (withstand voltage, neutral-point current,
etc.) were confirmed by factory tests, the transformers were
temporarily installed in the substation and the condition of power
supply to a train was tested (Figs. 5 and 6). As a result, we reached
the conclusion that the new-type transformer could be applied to
substations for the Shinkansen.
Transformers of the new type are planned to be installed in new
Shinkansen substations scheduled for construction in the future
and in existing Shinkansen substations for replacement of their
obsolescent transformers.
Of the present research and development, the fabrication and
testing of transformers for verification were carried out jointly by
the RTRI; Japan Railway Construction, Transport and Technology
Agency; and JR East.