Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication
Patent
1986-08-12
1988-11-15
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of ground fault indication
324522, 324525, 361 80, G01R 3108
Patent
active
047852496
ABSTRACT:
A method to detect voltage and current of an electric power system and, based on the detected values, calculate resistance and inductance of the power transmission line and thereby to measure the distance from the relay apparatus to the point of the fault of the power transmission line. The voltage (v) and current (i) of the electric power system are detected at constant sampling intervals and the thus detected values at the sampling time points from t.sub.n to t.sub.n+2 are used in the approximate integration formula: ##EQU1## where K.sub.1 and K.sub.2 are constants, and through this approximation the resistance (R) and inductance (L) of the power transmission line as the object of the measurement are obtained, and thus, even when a current including components of different frequencies is flowing through the power transmission line, the distance sought can be measured precisely.
REFERENCES:
patent: 4107778 (1978-08-01), Nii et al.
patent: 4344143 (1982-08-01), Kurosawa et al.
patent: 4568872 (1986-02-01), Heller et al.
Oura et al., "Algorithm for New Type Distance Relay", Paper 1282 at National Conference of the Japan Society of Electric Engineering in 1985.
Eisenzopf Reinhard J.
Mitsubishi Denki & Kabushiki Kaisha
Mueller Robert W.
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