Transient-free isolation monitor

Details Transient-free isolation monitor Transient-free isolation monitor

1975-01-30

1976-06-01

Goldberg, Gerald

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 51, 307311, H02H 326

Patent

active

039612244

ABSTRACT:
Line isolation monitor utlizing photoisolators to effect switching without transients. Phase-lift networks are connected between the conductors of an isolated power system to provide samples to be monitored. A photoisolator comprising a light-emitting diode (LED) and a photoresistor is connected between each of the phase-shift networks and a current monitor, and the LEDs are energized alternately to apply the signals to the monitor. Timing circuits are included for preventing one photoisolator from being turned on while the other is still conducting.

REFERENCES:
patent: 3066284 (1962-11-01), McKinley et al.
patent: 3699392 (1972-10-01), Lee et al.

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