Security apparatus for the protection of electric machines

Details Security apparatus for the protection of electric machines Security apparatus for the protection of electric machines

1976-02-02

1978-07-04

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 47, 361 49, H02H 316

Patent

active

040992152

ABSTRACT:
The present invention relates to a security apparatus connected to the circuit of a machine in order to detect the presence of a fault therein such as a short circuit or loss of insulation between a power line and ground. The security apparatus comprises a tripping circuit having at least one transistor which is normally nonconductive and becomes conductive only when a fault current is fed to its base. The collector current activates a circuit breaking device and/or a signalling device which are continuously energized. The security apparatus operates, depending on its mode of connection, in response to a relatively small detected fault current resulting, for example, from defective insulation or from a short circuit. The security provided is irrespective of the state of the ground of the apparatus being protected.

REFERENCES:
patent: 2663806 (1953-12-01), Darlington
patent: 2698416 (1954-12-01), Sherr
patent: 3155879 (1964-11-01), Casey et al.
patent: 3239718 (1966-03-01), Fegley
patent: 3286129 (1966-11-01), Gagniere
patent: 3402326 (1968-09-01), Guasco et al.
patent: 3487284 (1969-12-01), Cady
patent: 3493838 (1970-02-01), Gyugyi et al.
patent: 3581152 (1971-05-01), Hunt
patent: 3864581 (1975-02-01), Satyanarayana

Affiliated with

Also associated with

Rating

Security apparatus for the protection of electric machines does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Security apparatus for the protection of electric machines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Security apparatus for the protection of electric machines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-281271