Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1985-06-03
1988-02-16
Scott, J. R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
361127, 361137, 361138, H01T 1400
Patent
active
047259175
ABSTRACT:
A current limiting horn device for a transmission line supported by sets of insulators suspended from arms of steel towers. The device includes horns located respectively at charging and earthing portions of each set of the insulators and spaced horizontally apart a predetermined distance from a vertical axis of the set of the insulators. At least one of the horns is provided with an arrester element of a resistance having a non-linearity. According to the invention, a ratio Z/Zo of a distance Z between the horns to a total length Zo of the one set of insulators is not more than 0.5, thereby when extraordinary voltage caused by lightening surge is applied to the transmission line, securely causing flash-over between horns to prevent any earthing accident which would otherwise occur in the transmission line.
REFERENCES:
patent: 1477304 (1923-12-01), Allcutt
patent: 2246303 (1941-06-01), Hodnette
patent: 4308566 (1981-12-01), Imataki et al.
patent: 4326233 (1982-04-01), Yamabu et al.
Technical Report (Part I), No. 76, "Outline of Insulator Design for Overhead Transmission Line", Japanese Electrical Society, Oct. 1966.
Hasegawa Yoshio
Irie Takashi
Mori Sadao
Jennings Derek S.
NGK Insulators Ltd.
Scott J. R.
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