Method and apparatus for detecting ground faults in isolated...

G - Physics – 01 – R

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

324/58.4

G01R 31/02 (2006.01) G01R 27/18 (2006.01)

Patent

CA 1142593

Abstract of the Disclosure There is described a line isolation monitor for detecting ground faults in isolated power systems by determining the potential personnel hazard current due to the complex ground fault impedances and a method of accomplishing the same. The total hazard current is determined by dividing the peak line voltage of the isolated power supply by the total impedance between ground and a common mode point, such as the center tap of the primary winding of the line isolation monitor transformer connected to the isolated power supply. This impedance is determined at line frequency by impressing a minute, phase-modulated, power line frequency test signal into the isolated power system and using an extremely selective, coherent filter to remove the signals in phase with the power line signal. The magnitude of the phase modulated test signal passed through the filter is related to the amount of fault impedance. Comparison of this test signal magnitude to the line voltage provides an indication of the total hazard current. The circuitry for accom- plishing this procedure includes a closed loop system which adjusts the current level of the test signal until the voltage of the filter test signal reaches a predetermined level related to the line voltage of the isolated system. The current level of the test signal is then related to the total hazard current.

326434

LandOfFree

Say what you really think

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

Rating

Method and apparatus for detecting ground faults in isolated... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for detecting ground faults in isolated..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for detecting ground faults in isolated... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-233499

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