Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-03-19
1981-12-22
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2700
Patent
active
043073360
ABSTRACT:
A process and system for the purpose of running and controlling electrical high-voltage power lines, particularly of the pertinent generators, wherein a line identification is required with the determination of the longitudinal equivalent reactance of each line section coupled with a measuring point or with a generator connected there, the generator being represented by this longitudinal reactance between the measuring point and a point on the line with amplitude and phase-rigid line voltage. The reactance is determined continuously from the local measured dimensions (P, Q, V.sub.1) by using a majority of predetermined values (X.sub.e1 -X.sub.e3) of the searched for reactance through similarity comparison of the time developents of phase angle differences (d.sub.1 to d.sub.3) formed by the predetermined values (X.sub.e1 -X.sub.e3) and the local phase angle (d.sub.m).
REFERENCES:
patent: 2592750 (1952-04-01), Selove
patent: 2593175 (1952-04-01), Packard et al.
patent: 2595297 (1952-05-01), Relis
patent: 3445763 (1969-05-01), Harris, Jr.
patent: 3818332 (1974-06-01), Schlosser
BBC Brown Boveri & Company Ltd.
Krawczewicz Stanley T.
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