Time delay relay arrangement

Details Time delay relay arrangement Time delay relay arrangement

1992-01-09

1994-03-22

Wysocki, Jonathan

Electricity: motive power systems

Motor-reversing

318264, H02P 100

Patent

active

052967867

ABSTRACT:
A voltage switching arrangement for an electrical power control system including a plurality of switches for connecting and disconnecting voltage from the input to a power transfer network which provides power for a load. A time delay circuit prevents the voltage connected to the input to the power transfer network from being disconnected for a predetermined time period after the control system has been turned off. The power transfer network switches from an on-mode to the off-mode during said time delay period. The voltage connecting switches include an electromechanical DC relay, and the time delay circuit includes a capacitor cooperating with the relay to maintain the relay energized for the time delay period after the control system has been turned off. Safeguards are provided to prevent simultaneous connection of voltage in the forward and reverse directions to the input of the power transfer network.

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patent: 4633152 (1986-12-01), Farr
patent: 4896084 (1990-01-01), Maue et al.

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