Title: Overcurrent relay apparatus

Abstract: Digital overcurrent relay apparatus utilizing sampling, digital conversion and digital comparison techniques is described. The apparatus provides a trip signal after an alternating current in a line being monitored by the apparatus exceeds a preset pick up value for a period of time which is an inverse function of the magnitude of the current expressed in multiples of pick up value.

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Inventors: DePuy, Robert P. (Cherry Hill, NJ, US)

Application Number: 971313
Filing Date: 1978-12-20
Publication_date: 1980-08-26
Assignee: General Electric Company (Schenectady, NY)
Primary Class(es): 361/94 361/96, 700/293
Other Classes:
US Patent Ref:

3569785	Mar, 1971	Durbeck et al.	361/80.
3885199	May, 1975	Nohara et al.	364/483.
4077061	Feb, 1978	Johnston et al.	364/483.

Other Refs:
Primary Examiner: Salce, Patrick R.
Assistant Examiner:
Attorney: Zaskalicky; Julius J., Davis, Jr.; James C., Snyder; Marvin