Protective relay arrangements

Details Protective relay arrangements Protective relay arrangements

1976-11-10

1978-05-30

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 67, 361110, H02H 338

Patent

active

040926915

ABSTRACT:
A starting relay for a power transmission line protection system.
Where long line sections have to be protected, confusion can arise between normal heavy loads and distant faults having comparable line impedance. The invention provides a starting relay which limits operation of the normal distance relay to conditions within the starting relay characteristic, this being derived by phase and amplitude monitoring of the load at the relay station. The characteristic accepts heavier line currents at potentially normal phase angles than at abnormal phase angles.
Certain unbalanced faults do however exhibit normal phase angles and these are detected by substantial line voltage drops. A described combination of phase, current and voltage detectors thus covers substantially all faults.
The starting relay finds particular application in a carrier-blocking fault detection scheme employing duplicates of the basic characteristic.

REFERENCES:
patent: 2845581 (1958-07-01), Hodges et al.
patent: 3938007 (1976-02-01), Boniger et al.

Affiliated with

Also associated with

Rating

Protective relay arrangements 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 arrangements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protective relay arrangements will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-473014