| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress an exciting rush-in current in the case of inputting a three-phase transformer for all phases at the same time by making difference between a stationary magnetic flux and a residual magnetic flux smaller. <P>SOLUTION: An exciting rush-in current suppressing device 1 is constituted of voltage measuring means 11U, 11V, 11W, 13, a residual magnetic flux calculating means 15, an input phase controlling means 21, and an input order output means 22. The input phase controlling means 21 determines an output period of the input command for inputting a breaker 2 at a target phase, and controls the input command output means 22. The input command output means 22 outputs an input command signal 25 against a breaker operation mechanism 2X. The difference between the stationary magnetic flux and the residual magnetic flux becomes smaller in the case both polarities are equal, and in the case the difference between the stationary magnetic flux and the residual magnetic flux is smaller about each of a U phase, a V phase, and a W phase, both differences as the whole of the transformer become smaller. The input phase controlling means makes a phase range 54 the target input phase range of the breaker wherein the polarity of the stationary magnetic flux and the residual magnetic flux of the respective phases are equal. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
