Method and apparatus for sensing current in high voltage conduct

Details Method and apparatus for sensing current in high voltage conduct Method and apparatus for sensing current in high voltage conduct

1981-05-18

1984-09-11

Swann, III, Glen R.

Communications: electrical

Continuously variable indicating

With particular transmitter

324 96, 340664, 34087029, 455612, H04B 900

Patent

active

044713550

ABSTRACT:
Alternating current carried in a high voltage conductor is sensed by a toroidal coil to produce a first low level signal representative of the alternating current signal. Transmitter means operating at or near the potential of the conductor and remote from electrical ground receives the low level signal and in response produces a series of modulated pulses containing amplitude and phase angle replica information representative of the high voltage alternating current signal. Advantageously, the transmitter may be powered by a power supply deriving power from the high voltage conductor. The pulses produced by the transmitter may be transmitted to a receiver operating at or near ground potential, which receiver then converts the pulses into a second low level signal representative of the high voltage alternating current signal in both amplitude and phase angle.

REFERENCES:
patent: 3488586 (1970-01-01), Watrous et al.
patent: 3506833 (1970-04-01), Von Willison
patent: 3590374 (1971-06-01), Evans et al.
patent: 3939412 (1976-02-01), Hermstein et al.
patent: 4012633 (1977-03-01), Huntley
patent: 4070572 (1978-01-01), Summerhayes
Stoli, R. L., "Method of Measuring Alternating Currents Without Disturbing the Conducting Circuit" Proceedings IEEE, vol. 122, No. 10, Oct. 1975, pp. 1166-1167.
Giacoletto, Electronics Designers' Handbook, 2nd Ed., McGraw-Hill Book Co., 1977, pp. 11-19.
Braun, A. et al., "Optoelectronic . . . Meter for High-V. Lines" IEEE Trans. on Inst. & Meas., IM-22, 4, pp. 394-399, Dec. 1973.

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