Electrical transmission or interconnection systems – Superimposed unlike currents – Ac and dc sources
Patent
1983-11-09
1985-09-10
Pellinen, A. D.
Electrical transmission or interconnection systems
Superimposed unlike currents
Ac and dc sources
340310R, H02J 302
Patent
active
045408890
ABSTRACT:
Method for improving the dielectric strength of insulation not subject to fluid pressure and used to insulate a conductor element, such as the conductor of a cable, an insulator, etc., subjected to direct current high voltage in which, during or prior to service use thereof, the insulation is subjected continuously or intermittently to a varying amplitude, direct current voltage. The amplitude of the variation is small relative to the average value of the direct current voltage and the frequency of the variation, preferably, is less than 60 Hz. Also, apparatus for providing the voltage of varying amplitude including an alternating current generator in series between the direct current source and the conductor element and inductor in parallel with the generator, the inductor having a low ohmic resistance and a high reactance relating, respectively, to the ohmic resistance and reactance of the generator.
REFERENCES:
patent: Re26683 (1969-10-01), Jakovlevich et al.
patent: 3702939 (1972-11-01), Darrow
patent: 4124886 (1978-11-01), Black et al.
patent: 4194128 (1980-03-01), Biglin
patent: 4417093 (1983-11-01), Occhini et al.
"High Voltage D.C. Cables: The State of the Art" by Maschio et al., Cigre, Aug. 21-29, 1974.
200 KV D.C. Submarine Cable Interconnection Between Sardinia and Corsica and Between Corsica and Italy, by Priaroggia, Cigre, Jun. 10-20, 1968.
Dielectric Phenomena in Impregnated Paper Insulated Cables for H.V.D.C. Trans. by Priaroggia, "Direct Current", vol. 8, No. 8, Aug. 1963.
Jennings Derek S.
Pellinen A. D.
Societa Cavi Pirelli S.p.A.
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