LIGHTNING STRIKE DISTINGUISHING AND LOCATING METHOD FOR OPTICAL FIBRE COMPOSITE OVERHEAD GROUND WIRE

摘要

A lightning strike distinguishing and locating method for an optical fibre composite overhead ground wire. The method comprises: according to the characteristic that the temperature in a position of an optical fibre composite overhead ground wire which is struck by lightning may suddenly rise due to lightning strike, by making full use of an optical fibre resource in the optical fibre composite overhead ground wire and the capability of conducting high-sensitivity detection and high-accuracy locating on an event by a distributed optical fibre temperature sensor, connecting the distributed optical fibre temperature sensor to a standby optical fibre in the optical fibre composite overhead ground wire; establishing the correlation between the geographic position of the optical fibre composite overhead ground wire and a distributed temperature curve; respectively comparing the temperatures in the same position in the temperature curve at different times, so as to extract a temperature sudden change area; then, comparing the change of temperatures in several positions adjacent to the sudden change area in the temperature curve, so as to eliminate an interference factor in the temperature measurement, so that it is determined that the sudden change of temperature is caused by heating of an instantaneous external factor, i.e. lightning strike; and finally, distinguishing and locating the lightning strike by combining the count change of a lightning arrester.