Method and apparatus for limiting current surge upon transfer of

Details Method and apparatus for limiting current surge upon transfer of Method and apparatus for limiting current surge upon transfer of

1996-12-20

1998-07-21

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 76, 307 87, 307127, 307129, H02H 318

Patent

active

057842400

ABSTRACT:
A method of and apparatus for actuating an automatic transfer switch for disconnecting a motor load from a normal source of voltage and reconnecting the load to an alternate source of voltage at a time when phase differences between the output voltage of the disconnected motor load and of the alternate source voltage are minimized to prevent excessive in-rush currents to the motor upon reconnection. Actuation of the transfer switch is commenced when the difference in phase between the normal source and alternate source is equal to a predetermined number of degrees depending upon whether the alternate source frequency is greater or less than the normal source frequency.

REFERENCES:
patent: 4256972 (1981-03-01), Wyatt et al.
patent: 4405867 (1983-09-01), Moakler et al.
patent: 4717998 (1988-01-01), Cheron et al.
patent: 4879624 (1989-11-01), Jones et al.
patent: 5311066 (1994-05-01), Malloy et al.
patent: 5555151 (1996-09-01), Baker et al.

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