Third phase reconstruction from a two current transformer sensor

Details Third phase reconstruction from a two current transformer sensor Third phase reconstruction from a two current transformer sensor

Filed on

1997-06-30

Date issued

1998-07-07

Examiner

Gaffin, Jeffrey A.

Patent Class

Electricity: electrical systems and devices

SubClass

Safety and protection of systems and devices

SubSubClass

With specific current responsive fault sensor

Other Related Categories

364483, 361 76, H02H 300

Type

Patent

Status

active

Patent number

057778353

Description

ABSTRACT:
A method and apparatus are disclosed to reconstruct a third phase for a three phase sensing system in which only two current transformers sense all three phases. Two phases of the three phase system are used as a single primary winding for each current transformer such that each current transformer produces a voltage representation of a sum of two phase currents. The present invention is directed toward reconstructing the third phase from the two discrete signals produced so that true RMS characteristics can be determined, as well as indicating any phase loss. Since all three phases can then be represented, this technique offers precise phase imbalance protection as well.

REFERENCES:
patent: 2202998 (1940-06-01), Seeger et al.
patent: 3604982 (1971-09-01), McDonald
patent: 3614533 (1971-10-01), Douglas et al.
patent: 3875464 (1975-04-01), Gary et al.
patent: 4574229 (1986-03-01), Kim
patent: 4683513 (1987-07-01), Miller
patent: 4683515 (1987-07-01), Beihoff et al.
patent: 4967304 (1990-10-01), Dougherty
patent: 5113304 (1992-05-01), Ozaki et al.
patent: 5220478 (1993-06-01), Innes et al.
patent: 5239438 (1993-08-01), Echtler
patent: 5450268 (1995-09-01), Phillips et al.
patent: 5506743 (1996-04-01), Phillips
patent: 5579194 (1996-11-01), Mackenzie et al.

Affiliated with

Also associated with

Rating

Third phase reconstruction from a two current transformer sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Third phase reconstruction from a two current transformer sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Third phase reconstruction from a two current transformer sensor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1212809