Restricted earth fault protection for transformers using a direc

Details Restricted earth fault protection for transformers using a direc Restricted earth fault protection for transformers using a direc

1998-06-16

1999-10-05

Jackson, Stephen W

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 36, 361 42, 361115, H02H 700

Patent

active

059634049

ABSTRACT:
The residual phase currents for each selected winding of a transformer are first determined and then summed to provide a value designated I.sub.X. The neutral current for the transformer is also determined, with the neutral current being designated I.sub.Y. A directional element calculates a torque value T according to the following formula: T=R.sub.e (I.sub.X .multidot.I.sub.Y *). This torque value will be negative for an external (reverse) fault, and positive for an internal (forward) fault. The quantity of the torque is compared against threshold values before a forward or reverse fault for the transformer is declared.

REFERENCES:
patent: 5115226 (1992-05-01), Schweitzer
patent: 5572138 (1996-11-01), Nimmersjo

Affiliated with

Also associated with

Rating

Restricted earth fault protection for transformers using a direc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Restricted earth fault protection for transformers using a direc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Restricted earth fault protection for transformers using a direc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1178834