Over-voltage prevention device
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United States of America Patent
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Oct 25, 2016
Grant Date -
Aug 13, 2015
app pub date -
Feb 6, 2015
filing date -
Feb 7, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
According to one embodiment, an over-voltage prevention device is provided between a secondary-winding side of a wound-rotor induction machine and a frequency converter configured to excite the secondary-winding side of the wound-rotor induction machine through a three-phase excitation power supply line. The over-voltage prevention device includes a first short-circuit device having a function of short-circuiting between phases of the excitation power supply line, and a second short-circuit device having a function of short-circuiting between phases of the excitation power supply line with a short-circuit impedance greater than a short-circuit impedance of the first short-circuit device.
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