| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress, without additionally providing any interrupters having resistors or the like, an exciting inrush current occurring when a three-phase transformer is powered on by using three single-phase type interrupters at the same time or using a three-phase batch operating type interrupter. <P>SOLUTION: In a transformer exciting inrush current suppressing method for suppressing an exciting inrush current occurring at the beginning of an excitation by putting each phase terminals of a three-phase transformer 300 in a three-phase power supply 100 via a three-phase interrupter 200, phase voltages of a primary, secondary or tertiary side or interline voltages during steady-state application of three-phase AC voltages to the transformer 300 are integrated to calculate steady-state magnetic fluxes 4, 5 and 6 of each phase of the transformer; the polarities and magnitudes of residual magnetic fluxes 7, 8 and 9 of each phase of the transformer after the interruption of the transformer by the interrupter 200 are calculated; and the three-phase interrupters are simultaneously powered on when the phases, for which the polarities of the steady-state magnetic fluxes 4, 5 and 6 of the transformer phases are identical with the polarities of the residual magnetic fluxes 7, 8 and 9 of the transformer phases, are within a range 13 in which the three phases overlap with one another. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
