induced current

Methodology that allows estimating the values of currents on the cable core screens and choosing the method of connection and grounding of screens is considered. To achieve the objective it is necessary to develop a mathematical model and to perform corresponding numeric calculations for the design and verification of efficiency of screen transposition taking into account the mutual phase disposition.

A study of the conditions of application of an approximate method for analysis of a three-dimensional pulse electromagnetic field with an arbitrary current loop, which is located near the flat surface of a conductive body, has been performed. It has been shown that each term of the asymtotic series is calculated with some accuracy, and therefore it has its own minimum cutoff frequency.