Method and apparatus for preventing dry band arcing in a combine

Details Method and apparatus for preventing dry band arcing in a combine Method and apparatus for preventing dry band arcing in a combine

1994-12-06

1996-06-11

Ullah, Akm E.

Optical waveguides

Optical transmission cable

With electrical conductor in the same cable

174 70R, G02B 644

Patent

active

055264573

ABSTRACT:
An overhead electrical power and optical transmission system, comprising overhead electrical phase conductors (2) extending between and supported by towers (10), and at least one optical cable (1) that extends between and is supported by, the towers. Each optical cable has a resistive element (12) that is removably supported thereby and which extends from a tower (10) where it is earthed part of the way along the span of the optical cable, and the resistive element has the necessary length and conductivity such that if a dry band (6) occurs on the cable at the end of the element, the potential difference (VG') across the band is insufficient to form an arc, such that any induced current is insufficient to sustain any arc that may occur across the dry band.

REFERENCES:
patent: 4673247 (1987-06-01), Oestreich
patent: 4776665 (1988-10-01), Oestreich
"Mathematical model of dry-band arcing on self-supporting, all dielectric, optical cables strung on overhead power lines" by Carter et al, May 1992, IEE proceedings.
"Development of aerial fibre optic cables for operation on 400 kv power lines" by Peacock et al. IEE Proceedings vol-139, No. 6, Nov. 1992.
"Self-Supporting Dielectric fiber Optic Cables in High Voltage lines" by Oestreich et al., International Wire & Cable Symp. Proceedings 1988 (No month).
Patent Abstracts of Japan, vol. 009 No. 281 (P-403), 8 Nov. 1985 & JP-A-60 122908 (Mitsubishi Denki KK) 1 Jul. 1985.

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