Apparatus for controlling the starting of a three phase load wit

Details Apparatus for controlling the starting of a three phase load wit Apparatus for controlling the starting of a three phase load wit

1986-03-12

1987-05-19

Smith, Jr., David

Electricity: electrical systems and devices

Safety and protection of systems and devices

Reverse phase responsive

307127, H02H 3353

Patent

active

046672648

ABSTRACT:
An apparatus for controlling the starting of a three phase load in its normal phase sequence. The apparatus is connected to the load in a predefined manner and has input terminals for receiving three phase electric energy through external supply lines. There is provided a device within the apparatus which automatically corrects the phase sequence of the electric energy supplied to the load. An open phase protection device is provided which allows the starting of the load in response to the absence of open phase in the received electric energy, and inhibits the starting of the load in response to the presence of open phase in the received electric energy due to, for example, breaking of an external supply line. In one embodiment, the apparatus is built into a submersible motor-pump assembly. The pump is always initiated to rotate its impeller in a proper direction for pumping, regardless of correct or incorrect phase connections between the external supply lines and the input terminals of the apparatus. The open phase sensor and associated switches prevent a single phase mode of operation of the load.

REFERENCES:
patent: 2724782 (1955-11-01), Holloway
patent: 2975334 (1961-03-01), Callan
patent: 3708719 (1973-01-01), Ishikawa
patent: 4021704 (1977-01-01), Norbeck
patent: 4163270 (1979-07-01), Marus
patent: 4196378 (1980-01-01), Shirai

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