Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1987-01-20
1988-08-30
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
361 93, 364483, G01R 3102
Patent
active
047679964
ABSTRACT:
A fault current detection device which, in order to take into consideration a record in the past of a load current up to a time instance when a short-circuit is caused, operates, every sampling period .DELTA.t, a variable .DELTA.I.sub.n =f(I.sub.n, J.sub.n-1) representatve of the record obtainable as a function of an instantaneous current value I.sub.n at nth sampling time and a parameter J.sub.n-1 obtained by weighting the load current within a preceding specified time period is featured by that the parameter J.sub.n-1 is substituted by the present current value I.sub.n when a variation of current is in a decreasing direction and that a variable .DELTA.I.sub.n =f(D.sub.n, .DELTA.I.sub.n-1) obtainable as a function of a current varying rate D.sub.n at nth sampling time and a variable .DELTA.I.sub.n-1 representative of a current varying rate at (n-1)th sampling time is calculated every sampling period .DELTA.t with variable .DELTA.I.sub.n being zero when D.sub.n is negative.
REFERENCES:
patent: 4160282 (1979-07-01), Dolinar et al.
patent: 4707761 (1987-11-01), Podobinski
Instruction Manual for the products of Tsuda Denki Keiki K. K. of Japan, named "FE-12/FE-15 I Type DC Feeder Fault Discriminator", Dec. 1984.
Toshimasa Jinzenji et al, "A GTO DC Circuit Breaker Controlled by a Single-Chip Microcomputer", IEEE Transactions on Industrial Electronics, vol. 1E-32, No. 3, Aug. 1985.
Toshimasa Jinzenji et al, "Microcomputer-Based Protective Relay to Detect DC Feeder Short-Circuit Fault", IECON'86, pp. 504-509.
Eisenzopf Reinhard J.
Kabushiki Kaisha Toshiba
Regan Maura K.
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