E.G. Psarros, Ch.K. Kontokostas, S.K. Athanasopoulos, P.T. Tsarabaris, C.G. Karagiannopoulos, and P.D. Bourkas (Greece)
Steel wire, insulation distance reduction, ground fire.
This work deals with theoretical and experimental
investigation concerning the insulation distance reduction
of distribution lines, when a stay wire (a steel wire that
supports the pole of the distribution network), was heated
due to ground fire occurrence. It has been experimentally
proven that a ground fire can drastically reduce the
mechanical strength of stay wire, up to a point that wire
breakage can be caused even from a small ground fire
produced by dead wood and small bushes near the wire.
Theoretical results lead to the conclusion that the fire
causes a permanent expansion on the wire which results
in the loosening of the bare conductors.