Protective relay having out-of-step logic capability

Details Protective relay having out-of-step logic capability Protective relay having out-of-step logic capability

1996-01-04

1998-03-24

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

324522, H02H 318

Patent

active

057319430

ABSTRACT:
An out-of-step blocking circuit is established with two additional zones in the impedance plane, with the circuit determining the time that the positive sequence impedance takes to move between the two zones. The distance elements for selected zones of protection for the relay are blocked if the impedance moves between the two zones at a rate less than a first threshold. However, a trip signal results if the rate of change is greater than the first threshold but less than a second threshold, indicating an unstable swing. Further, an inner blinder zone is established in the impedance plane within the additional two zones of protection. If the positive sequence impedance entering that zone does not move from that zone within a certain time during an otherwise out-of-step condition, the blocking signals are terminated.

REFERENCES:
patent: 4825323 (1989-04-01), Wilkinson
patent: 5367426 (1994-11-01), Schweitzer, III

Affiliated with

Also associated with

Rating

Protective relay having out-of-step logic capability does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Protective relay having out-of-step logic capability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protective relay having out-of-step logic capability will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2293951