An accurate closed-form approximation for ground return impedance calculations
- 1 January 1983
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IEEE
- Vol. 71 (2), 279-280
- https://doi.org/10.1109/proc.1983.12573
Abstract
The calculation of ground return impedances generally requires the evaluation of an infinite complex integral. Algebraic series expressions that usually converge to the value of this integral have been known for about 50 years. Several approximate "closed-form" expressions for the integral have been proposed in recent years. Under most conditions, these approximate models give values within 15 percent of the correct value. This letter presents an improved "closed-form" approximation which gives values within 2.5 percent of the correct ones in all cases tested. It does so without any convergence difficulties. Furthermore, the results obtained are better than the ones obtained from series expression approximations if premature truncation takes place.Keywords
This publication has 2 references indexed in Scilit:
- The Complex Ground Return Plane a Simplified Model for Homogeneous and Multi-Layer Earth ReturnIEEE Transactions on Power Apparatus and Systems, 1981
- Wave Propagation in Overhead Wires with Ground ReturnBell System Technical Journal, 1926