EXTENSION OF THE CHOWDHURI-GROSS MODEL FOR LIGHTNING INDUCED VOLTAGE ON OVERHEAD LINES.

Abstract

A corrected expression is presented of the Chowdhuri-Gross model for the induced voltage on an overhead line. The expression is derived in an analytical form for a linearly rising ramp stroke current waveform. Based on certain corrections, it is shown that the induced voltage on a conductor of a multiconductor system is the same as that of a single conductor occupying the same position. A new expression, of analytical form, for the induced voltage due to a rising ramp wave is also presented. This expression can predict both bipolar and unipolar induced voltage waves. Comparisons of calculated induced voltage waveforms of several models with published simultaneous lightning current/induced voltage field results are also presented.