Motor operator with ac power circuit continuity sensor

Details Motor operator with ac power circuit continuity sensor Motor operator with ac power circuit continuity sensor

1998-06-19

2000-06-13

Jackson, Stephen W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 23, 361115, H02H 300

Patent

active

060756888

ABSTRACT:
A motor operator with a continuity sensor has a test current injector and a voltage sensor arranged to determine if a loss of AC voltage is due to a discontinuity, such as a blown fuse, in the circuit of a transformer powering the motor operator rather than a loss of voltage from an AC power line. A line voltage detector, such as a resistive or capacitive voltage divider, can also be used with a continuity sensor to distinguish between a discontinuity in the voltage detector and a loss of line voltage. Based on the cause determined by the continuity sensor, signals are generated either to motor operate a disconnect switch or not to.

REFERENCES:
patent: 5311108 (1994-05-01), Willard
patent: 5334919 (1994-08-01), Willard
Cleaveland/Price Inc. Bulletin DB-128A94, 1994, "Types BR, BT-D and BT-T Motor Operators for Transmission and Distribution Automation".
Cleaveland/Price Inc. Instruction Book IB-AA10-019D, Sep. 1997, "Auto Actuate (LVA) Device".

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