Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1990-08-30
1993-01-19
Skudy, R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 87, H02H 300, H02H 700, H02H 902
Patent
active
051811553
ABSTRACT:
An overcurrent trip circuit monitors the rate of rise of the current and the magnitude of the current in a power conductor and opens a circuit containing the power conductor when either the rate of rise of the current exceeds a first preselected limit value or the magnitude of the current exceeds a second preselected limit value. The inherent inductance in a metering shunt is used to produce a voltage signal that contains a component which is representative of the rate of change of current in a power conductor. This voltage signal is compared to a first reference signal to produce a trip signal when the voltage exceeds the first reference signal. In addition, the voltage signal is processed and the processed voltage signal is compared to a second reference signal to produce a second trip signal when the magnitude of the processed voltage signal exceeds the magnitude of the second reference signal. The power circuit is then opened in response to either of the first or second trip signals.
REFERENCES:
patent: 3604983 (1971-09-01), Levin
patent: 3697813 (1972-10-01), Fox
patent: 3697860 (1972-10-01), Baker
patent: 3879652 (1975-04-01), Billings
patent: 3914667 (1975-10-01), Waldron
patent: 3925709 (1975-12-01), Mitchell et al.
patent: 4160282 (1979-07-01), Dolinar et al.
patent: 4245184 (1981-01-01), Billings et al.
patent: 4346424 (1982-08-01), Hansen
patent: 4354216 (1982-10-01), Volta
patent: 4363064 (1982-12-01), Billings et al.
patent: 4404473 (1983-09-01), Fox
patent: 4404612 (1983-09-01), Hughes et al.
patent: 4605982 (1986-08-01), Harner et al.
patent: 4707761 (1987-11-01), Podobinski
patent: 4724374 (1988-02-01), Beg
patent: 4825330 (1989-04-01), Walchle
patent: 4833563 (1989-05-01), Russell
patent: 4862312 (1989-08-01), Ishii
Beg Mirza A.
Fox David A.
Skudy R.
To Ed
Yatsko Michael S.
LandOfFree
Overcurrent trip circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Overcurrent trip circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Overcurrent trip circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-105568