Consideration of the calculation method of voltage induced electromagnetically in a communication line from a power transmission line under normal operating condition

The uneven distances from phase conductors of a power line to a nearby communication line may induce an interference voltage in the communication line even if no fault occurs on the power line. The conventional measures for suppressing the induced voltage such as the use of shielded cable and conduit are effective even for suppressing the interference voltage induced under the normal operating conditions. This paper proposes a method to calculate such an interference voltage induced under the normal operating condition of a power line.