Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1982-04-15
1984-06-12
Miller, Jr., George H.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
336174, 336215, 324127, G01J 1900, H02H 300
Patent
active
044545576
ABSTRACT:
The non-linear alternating current transducer includes a current transformer core (14, 50 or 80) comprising a yoke (14, 50 or 80) for receiving a line conductor (20 or 110) and a secondary winding (22 or 86). The yoke (14, 50 or 80) has an air gap (19, 56 or 101-105) configured to provide a non-linear magnetic circuit response for changes in current through the line conductor (20 or 110). The non-linear magnetic circuit response provides a logarithmic voltage output across the secondary winding (22 or 86). The current transformer (12) is used in a control circuit (10) for sensing, monitoring and interrupting current in the line conductor (20 or 110) such that a trip coil is energized to open the circuit whenever current is sensed above a predetermined current. Also, the logarithmic response provides for high gain at low currents and low gain at high currents to that a very uniform percentage-of-reading accuracy is obtained with a meter operating off of the secondary winding.
REFERENCES:
patent: 1952072 (1934-03-01), Jewell
patent: 2709800 (1955-05-01), Temple et al.
patent: 2994039 (1961-07-01), Parke
patent: 4011505 (1977-03-01), Spalding
patent: 4377836 (1983-03-01), Elms et al.
"Analog to Digital Converter", by E. H. Melan and E. C. Schuenzel, IBM Disclosure, vol. 2., No. 2, Aug. 1959.
Gabala J. A.
Gealow J. C.
Jennings Derek
McGraw-Edison Company
Miller Jr. George H.
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