System for preventing undesired protective relay tripping action

Details System for preventing undesired protective relay tripping action System for preventing undesired protective relay tripping action

1997-10-17

2000-02-22

Jackson, Stephen W

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 80, 361 65, 361115, H02H 300

Patent

active

060287543

ABSTRACT:
The system impedance ratio (SIR) is determined for the original zone 1 distance element reach of a protective relay. The reduction in the original zone 1 reach is then determined, using the SIR value and a known table of reduced values. When a fault is recognized the minimum reach to just detect the fault is determined. A trip signal is provided without any delay if the minimum reach is less than or equal to the reduced reach. The trip is delayed for a selected time if the minimum reach is greater than the reduced reach but not greater than the original reach.

REFERENCES:
patent: 4821137 (1989-04-01), Wilkinson
patent: 5349490 (1994-09-01), Roberts
patent: 5703745 (1997-12-01), Roberts et al.
Electric Machinery, A. E. Fitzgerald et al., 4th Ed., 1983 McGraw-Hill, pp. 499-500, 528-530 1983.

Affiliated with

Also associated with

Rating

System for preventing undesired protective relay tripping action does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for preventing undesired protective relay tripping action, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for preventing undesired protective relay tripping action will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-525580