| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the residual flux of a transformer core to substantially zero by parallel connection of a reactor to any one of a plurality of windings to raise the natural frequency of a transformer over a power source frequency as seen from a breaker for cutting off from a power system. SOLUTION: Reactors 25a, 25b, 25c for raising the natural frequency of a transformer are connected to low-voltage bushings 13a, 13b, 13c through reactor breakers 35a, 35b, 35c. If connecting conductors between high-voltage breakers 21a, 21b, 21c and the transformer connected to a power system have ground capacitances 31a, 31b, 31c having high capacitance values like cables, and the natural frequency of the transformer is lower than the power source frequency, reactors are fixed in parallel to the transformer to raise the natural frequency over the power source frequency.</p> |
