Phase unbalance detector

Details Phase unbalance detector Phase unbalance detector

1986-03-20

1988-02-09

Smith, Jr., David

Electricity: electrical systems and devices

Safety and protection of systems and devices

Reverse phase responsive

318798, 318806, 361 76, H02H 326

Patent

active

047245034

ABSTRACT:
A reduced voltage starter for gradually starting a polyphase motor having an acceleration control circuit for gradually applying power to the motor and detector circuits for detecting various fault conditions for terminating power to the motor. A shorted solid state switch detector senses when one of the semiconductor switches applying power to the motor is shorted to terminate the application of power from the remaining phases. A phase angle control circuit insures a uniform application of power to the motor. A phase rotation detection circuit detects when the three phases are in other than their correct sequence and terminates power in the event of such detection. An underload detection circuit senses when the current drops beneath a preselected reference after the motor has reached its full speed and terminates power in response to such detection. A line-to-line to line-to-neutral converter produces signals representative of the line-to-neutral voltages which are necessary for other circuit functions.

REFERENCES:
patent: 3825768 (1974-07-01), Grygera
patent: 3838314 (1974-09-01), Boothman et al.
patent: 4000446 (1976-12-01), Vandevier et al.
patent: 4199798 (1980-04-01), Leppke et al.
patent: 4218728 (1980-08-01), Chambers et al.

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