Protection of electrical power supply systems

Details Protection of electrical power supply systems Protection of electrical power supply systems

1979-02-26

1981-04-07

Smith, Jerry

Boots, shoes, and leggings

324 52, 361 79, 364551, 364576, G06F 1532, G06F 15332, H02H 326

Patent

active

042610389

ABSTRACT:
An electrical power fault protection relay operates when the calculated impedance of the section of the system it protects shows a sudden change. The instantaneous voltage and current is measured. A calculation device then calculates the Fourier transform of a window of the actual voltage and current over a time interval and of the modified current that would flow if the voltage on each side of the time interval was zero. The actual impedance is calculated from the ratio of the Fourier transforms of the actual voltage and the modified current.

REFERENCES:
patent: 3885199 (1975-05-01), Nohara et al.
patent: 3904859 (1975-09-01), Poncelet
patent: 3984737 (1976-10-01), Okamura et al.

Affiliated with

Also associated with

Rating

Protection of electrical power supply systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Protection of electrical power supply systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protection of electrical power supply systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-292276