Apparatus for determining prospective short circuit current

Details Apparatus for determining prospective short circuit current Apparatus for determining prospective short circuit current

1983-05-03

1986-05-13

Gruber, Felix D.

Boots, shoes, and leggings

361 63, 361 93, 364481, G06F 1556, G01R 2716, H02H 308

Patent

active

045890730

ABSTRACT:
An apparatus for determining the prospective short circuit current at any position in an electrical installation measures the voltage at a predetermined point or points of a half cycle of the operating voltage between conductors at any position in an electrical installation. A switching mechanism for connection and disconnection of an impedance between said conductors causes a current to flow therebetween for a short period, with the voltage measurement and actuation of the switching mechanism appropriately synchronized and sequenced. The differences in voltages caused by said current flow are measured and the differences in times of the half cycle caused by said current flow determined. A microprocessor having a random access memory (RAM) and a read only memory (ROM), stores the voltage measurements and time measurements in the RAM and uses a program previously stored in the ROM to derive the corresponding value of the prospective short circuit current. The microprocessor then displays the value on a display to provide direct reading of the short circuit current.

REFERENCES:
patent: 3569785 (1971-03-01), Durbeck et al.
patent: 3982175 (1976-09-01), Sauvanet
patent: 4073009 (1978-02-01), Andow et al.
patent: 4104724 (1978-08-01), Dix et al.
patent: 4196475 (1980-04-01), Hall
patent: 4254466 (1981-03-01), Jurek
patent: 4276605 (1981-06-01), Okamoto et al.
patent: 4342063 (1982-07-01), Thornell
patent: 4432030 (1984-02-01), Briccetti
patent: 4466071 (1984-08-01), Russell, Jr.

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