Electronic trip circuit breaker with CMR current sensor

Details Electronic trip circuit breaker with CMR current sensor Electronic trip circuit breaker with CMR current sensor

1997-11-05

1999-07-13

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 42, 361 47, 361102, H02H 300

Patent

active

059235144

ABSTRACT:
A current sensor has a closed loop magnetic hoop with a gap and a central aperture for receiving a conductor. An IC chip incorporating a Giant MagnetiResistive (GMR) sensor is positioned in the gap to provide a measure of the current in the conductor. A relatively small current transformer provides the necessary information about the direction of the current to an electronic trip unit for a circuit breaker as well as power supply for the IC chip and the trip unit. The trip unit operates in the presence of AC and DC faults. In a three phase power system, a single GMR chip in the proximity of three closely spaced phase conductors, together with a current measurement from the neutral line, enables trip units to operate on the occurrence of AC and DC faults.

REFERENCES:
patent: 3621334 (1971-11-01), Burns et al.
patent: 4425596 (1984-01-01), Satou
patent: 5049809 (1991-09-01), Wakatsuki et al.
patent: 5615075 (1997-03-01), Kim

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