Symmetrical fault current detector

H - Electricity – 02 – H

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

324/58.03

H02H 3/08 (2006.01)

Patent

CA 1287110

ABSTRACT SYMMETRICAL FAULT CURRENT DETECTOR Excess currents due to faults in an electrical power system are generally larger than excess currents due to the magnetisation of distribution transformers: discrimination has hitherto relied on a threshold detector. Magnetising currents are however, asymmetrical whereas fault currents are symmetrical. This specification discloses a detector which can detect symmetrical current waveforms on a conductor 1 and thus discriminate between a fault and a magnetising excess current. A resistor 4, placed across the output terminals of a bridge rectifier 3 has a resistance selected so that the voltage across it exceeds the breakdown voltage of trigger diodes 7 and 8 when the current in conductor 1, in any half cycle, exceeds a desired maximum. Capacitors 13 and 14 will thus only both charge up in response to a large symmetrical current: a logic control 23 is connected via lines 21 and 22 to detect such a condition.

508184

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Symmetrical fault current detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Symmetrical fault current detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Symmetrical fault current detector will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1177398

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.