Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1982-12-27
1984-04-03
Schreyer, Stafford D.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 52, H04B 346
Patent
active
044409850
ABSTRACT:
A toroidal, saturable core reactor (14) is connected in series with the conductors (11,19 and 13,21) of a transmission line. A termination network (16) is connected across the transmission line conductors (19,21). In response to an a.c. test signal transmitted from a generator (48) on one of the conductors (11), a series of voltage spikes are induced at the reactor (14) and superimposed on the a.c. test signal. The superimposed a.c. test signal is returned through the termination network (16) and the other line conductor (13) to a current detector (50) for detecting the spikes. A d.c. signal is then applied along with the a.c. signal. If there is a fault beyond the reactor (14), the spikes will be displaced from their expected positions. If there is a fault before reactor (14), the spikes will not be displaced. For ease in signal discrimination against noise, the d.c. signal is modulated.
REFERENCES:
patent: 3636280 (1972-01-01), Wetzel
patent: 3843848 (1974-10-01), Cox
patent: 4054759 (1977-10-01), McGrath et al.
Federico Joseph
Waaben Sigurd G.
Bell Telephone Laboratories Incorporated
Nimtz R. O.
Peoples J. T.
Schreyer Stafford D.
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