Current-measuring input for an electronic relay

Details Current-measuring input for an electronic relay Current-measuring input for an electronic relay

1977-07-01

1980-07-08

Gellner, Michael L.

Electrical transmission or interconnection systems

Combined impedance and switch systems

307100, 307154, 324127, G01R 1508

Patent

active

042119340

ABSTRACT:
The intermediate current transformer is replaced by a shunt resistor which bridges the secondary winding of the main current transformer and is of such magnitude that the secondary winding of the main current transformer is virtually short-circuited, but the voltage at the shunt resistor is still sufficient for evaluation in the electronic relay. The shunt resistor consumes only very little power and can therefore be located in the base of a plug-in device. This base, being a permanent part of the assembly, remains in circuit even when the relay is changed or removed for inspection or testing purposes.

REFERENCES:
patent: 1184706 (1916-05-01), Keller
patent: 1923644 (1933-08-01), Simpson
patent: 2261667 (1941-11-01), Stroszeck
patent: 3049687 (1962-08-01), Berni
patent: 3094678 (1963-06-01), Eisler
patent: 3111641 (1963-11-01), Wilentchik
patent: 3470520 (1969-09-01), Wegenberg
patent: 3509511 (1970-04-01), Soroka
patent: 3742947 (1973-07-01), Hashem
patent: 3955138 (1976-05-01), Milkovic
patent: 4054834 (1977-10-01), Bolrat
patent: 4070572 (1978-01-01), Summerhayes
patent: 4075459 (1978-02-01), Lieber
"Pluggable Terminator Resistor Pack", A. L. Balan, IBM Technical Disclosure Bulletin, vol. 20, No. 10, Mar. 1978.

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