| 摘要 |
A motor reversal protection system to protect driven equipment from the inadvertent or accidental reversal of direction of a three-phase electric motor should there be a reversal of phase in the transmission power lines by transposing any pair of the three power lines. The system detects the phase sequence of the applied power and automatically provides the driven equipment with the correct phase sequence within milliseconds of depressing the motor start push button. The need for a system reset is obviated in using this novel system design. The same principles of operation also apply for use with two-phase or DC power systems.
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