Automatic fault protection system for power recovery control

Details Automatic fault protection system for power recovery control Automatic fault protection system for power recovery control

1980-05-05

1981-12-29

Shoop, William M.

Electricity: motive power systems

Induction motor systems

With voltage source connected to motor secondary

363 37, 363 58, H02P 758

Patent

active

043084915

ABSTRACT:
An adjustable speed pumping system includes a plurality of pumps respectively driven by variable speed A.C. motors each having a power recovery circuit. Each power recovery circuit includes a series connected rectifier bridge, an inductive reactor and an inverter coupled to the secondary winding of the motor which has an A.C. source connected to the primary winding. A fault clearing mechanism is included in each circuit and includes solid state switches in the bridge actuated by a current level sensor coupled to the inverter output. The power recovery circuit also includes current foldback circuitry and secondary gating circuitry coupled to thyristors in the inverter. The power recovery circuits can be connected in parallel with a single motor and the system includes circuitry for sensing the highest amplitude current in the parallel circuits and controlling all circuits with this current. Each pump has a valve associated with the outlet and circuitry associated therewith to operate the pump at a low forward speed upon receipt of a stop command until the valve is closed to prevent significant reverse flow through the pump.

REFERENCES:
patent: 3515969 (1970-06-01), Magnuson et al.
patent: 3519909 (1970-07-01), Mathias et al.
patent: 3536984 (1970-10-01), Rosenberry, Jr.
patent: 4237531 (1980-12-01), Cutler et al.
patent: 4238821 (1980-12-01), Walker

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