Zero phase voltage measuring device

Details Zero phase voltage measuring device Zero phase voltage measuring device

1992-06-02

1993-05-25

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Polyphase

361 76, 324 86, 324509, G01R 1900

Patent

active

052143732

ABSTRACT:
A zero phase voltage measuring device for measuring a zero phase voltage of the three phase power system having an earth-fault includes an optic voltage sensor provided at any one of three power lines for detecting a current ground-to-line voltage thereat, a line-to-line voltage sensor provided between any two of the three power lines for detecting a current line-to-line voltage therebetween. A phase shifter and a multiplier are provided for calculating an ideal ground-to-line voltage at the power lines when no earth-fault is observed by changing the phase and multiplying the magnitude of the current line-to-line voltage. A subtracter is further provided to obtain a zero phase voltage signal by subtracting the ideal ground-to-line voltage from the current ground-to-line voltage.

REFERENCES:
patent: 1684056 (1928-09-01), Evans
patent: 2583798 (1952-01-01), Rowell et al.
patent: 3293497 (1966-12-01), Brandler et al.
patent: 3584299 (1971-06-01), Csete
patent: 3968432 (1976-07-01), Kelley, Jr.
patent: 4060843 (1977-11-01), Bost
patent: 4451783 (1984-05-01), Shidlovsky et al.
patent: 4819119 (1989-04-01), Wilkinson
patent: 4901005 (1990-02-01), Shin et al.
Report; F. Yoshinari et al., Chubu Denryoku Kenkyu Shiryo No. 80, issued by Chubu Denryoku Kabushiki Kaish in Jun. 1988-Japanese language-w/partial translation.

Affiliated with

Also associated with

Rating

Zero phase voltage measuring device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zero phase voltage measuring device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zero phase voltage measuring device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-900073