Ground fault sensor

Details Ground fault sensor Ground fault sensor

1975-10-28

1977-08-16

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 72, H02H 316

Patent

active

040429679

ABSTRACT:
An improved ground fault tester uses a magnetostrictive element or piezo-electric element, such as a multimorph, which changes dimensions upon being magnetized or electrically charged. The dimensional change is used to interrupt the power circuit in which the ground fault occurs. The existence of a ground fault is sensed by a sensor which supplies current to the magnetostrictive or piezo-electric element. In the case of the piezo-electric element, the charge is dissipated through a parallel discharge circuit whereby interruption of the power circuit is accomplished rapidly and is reclosed only after a time delay. Automatic time delay resetting may be easily accomplished by the addition of a single resistor and a rectifier. The dimensional change in the piezo-electric or magnetostrictive element is utilized to reset the power circuit interrupter some selected number of times and/or at reduced power whereby ground faults can be distinguished from transient disturbances on the basis of their duration rather than by analysis of their electrical characteristics.

REFERENCES:
patent: 2120985 (1938-06-01), Melhose
patent: 2201879 (1940-05-01), Blattner et al.
patent: 2365738 (1944-12-01), Williams
patent: 3739229 (1973-06-01), Moran

Affiliated with

Also associated with

Rating

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

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-365132