Circuit for detecting a positive phase or an opposite phase in t

Details Circuit for detecting a positive phase or an opposite phase in t Circuit for detecting a positive phase or an opposite phase in t

1978-02-06

1980-04-01

Smith, Jr., David

Electricity: motive power systems

Power factor control of armature or line circuit

361 33, 361 76, 361 77, H02P 718

Patent

active

041963784

ABSTRACT:
A circuit for detecting whether, or not, a three-phase load is correctly connected to a three-phase supply employs an inductance, capacitor and resistor connected in the three branches of the load circuit so as to generate a single phase output signal when connected to the supply, to voltage of the signal depending upon the connection to the supply. The circuit requires only three wires and not connected to a ground, or neutral. The output signal controls a reversing switch to ensure that the load is always automatically connected correctly; in a preferred form only one of the voltages is sufficient to light a source of radiant energy to activate a sensor to energize the reversing switch.

REFERENCES:
patent: 2687512 (1954-08-01), Miller et al.
patent: 2724782 (1955-11-01), Holloway
patent: 2975334 (1961-03-01), Callan
patent: 3395324 (1968-07-01), Rager, Jr.
patent: 3428865 (1969-02-01), Opad
patent: 3467833 (1969-09-01), Sandgren

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