Voltage induced on communication lines by magnetic field of an overhead electric line in short-circuit conditions

Cable lines and overhead electric lines are often located near each other over a significant length. This circumstance determines the relevancy of the problem of their electromagnetic compatibility. A dangerous influence of overhead electric lines over communication lines occurs in short-circuit conditions of overhead electric lines. The influence of overhead electric lines over communication lines with taking the probability of a short circuit into account has been firstly examined in this article. It is shown that in a typical case, on a parallel path length of 20 km, the probability of short circuit is not more than 0.012, or, on average, no more than one damage in 83 years of operation of communication lines. It is noted that under the magnetic influence of overhead electric lines over communication lines, the calculated value of the induced pulse energy at the unit resistance Wsp(max) 2 [] ⋅ As is taken as the main rate parameter, and as an additional one is taken the value of the voltage induced on the circuit subject to influence.