Thermal resistance of optical ground wire to direct lightning strike

The need to speed up the construction of trunk digital communications cause the existing infrastructure to be used for communication lines. Often optical fibers are incorporated into a ground wire. From experience to date the necessity follows to perform a detailed analysis of thermal resistance of optical ground wire to a direct lightning strike. The paper describes the method and exhibits the results of simulation of transient electromagnetic and temperature field in optical ground wire. The method makes possible to take into account actual cable geometry, physical properties of materials, skin and proximity effects. The selection of idealized lightning current pulse has been justified for thermal simulation.