Field overvoltage protecting apparatus for synchronous machine

Details Field overvoltage protecting apparatus for synchronous machine Field overvoltage protecting apparatus for synchronous machine

1977-03-30

1978-10-03

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

322 59, 322 68, 322 72, 361 56, H02H 709

Patent

active

041187490

ABSTRACT:
An apparatus for protecting a synchronous machine from a field overvoltage is disclosed. The apparatus comprises a field excitation control circuit which is impressed with the armature voltage of the synchronous machine so as to provide a DC power supply for producing a DC output to excite the field winding of the synchronous machine, a first discharge circuit which is adapted to discharge the stored energy of the field winding when the synchronous machine is to be tripped under predetermined conditions, and a second discharge circuit for reducing the field voltage by allowing a field current to flow therethrough in response to generation of an overvoltage whose absolute value is higher than a predetermined level, across the field winding. The resistance of the second discharge circuit is selected to be higher than that of the first discharge circuit so that even in the presence of an overvoltage across the field winding, the overvoltage is suppressed by the second discharge circuit thereby to prevent frequent tripping of the synchronous machine due to overvoltage.

REFERENCES:
patent: 3032701 (1962-05-01), Krausz
patent: 3069613 (1962-12-01), Enns et al.
patent: 3314001 (1967-04-01), Brockman
patent: 4047095 (1977-09-01), Wijnterp

Affiliated with

Also associated with

Rating

Field overvoltage protecting apparatus for synchronous machine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Field overvoltage protecting apparatus for synchronous machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Field overvoltage protecting apparatus for synchronous machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1805142