直流高電圧1500V電車用ヒューズの試作と実用化

概要

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This article describes the development of the DC1500V high voltage fuse for train use. At first the performance required to the fuse was investigated. Then test results of trial products of DC1500V etching fuses were shown. Recently JIS standard of the fuses for train use was considerably revised based on IEC standard. We conducted current breaking test according to the new JIS standard. It was found that etching fuses of from 75A to 110A rating have higher current breaking performance both in the very large inductive circuit like 20mH and in the higher short circuit like 25kA. By test results of these breaking tests and temperature rise test, we can presume to put the invention to practical use up to 500A rating DC 1500V high voltage etching fuse for train use.