| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an excitation rush current prediction device capable of predicting the waveform of an excitation rush current and/or a maximum momentary voltage drop amount of the waveform due to the waveform without measuring voltages of a transformer when the transformer is at a stop and applied with voltage. <P>SOLUTION: The excitation rush current prediction device includes: an input device 10 for connection information, and voltage application phase angle and residual magnetic flux information of the object transformer; an excitation rush current processing unit 24d which processes a primary-side excitation rush current of the object transformer input through a current transformer for a measuring gauge on the basis of the connection information; a unit rush current arithmetic device 25 which calculates the crest value and the rush current width of the excitation rush current, also calculates excessive magnetic flux of the object transformer, and calculates the unit rush current of the object transformer on the basis of the excessive magnetic flux and the crest value of the excitation rush current; an excitation rush current prediction-momentary voltage drop amount arithmetic device 30 which calculates an excitation rush current at which a momentary voltage drop amount becomes maximum on the basis of the unit rush current, a voltage application phase angle and residual magnetic flux; and processes the excitation rush current into an excitation rush current; and a display device 40 which displays the waveform of the excitation rush current. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
