Parameters Calculation of the Protective Earthing Systems

• Pages: 234-245

234

Vol. 7 No.1

May, 2021

Balkan Journal of Interdisciplinary Research

IIPCCL Publishing, Graz-Austria

ISSN 2410-759X

Acces online at www.iipccl.org

Parameters Calculation of the Protective Earthing Systems

Dr. Xhemali Pejtamalli

Polytechnic University of Tirana, Albania

Msc. Ing. Eda Pejtamalli

Engineer of Telecommunication in Hiberband Company

Ing. Eris Pejtamalli

Aircra Enginier Internacional Aeroport Tirana, Albania

Prof. Dr. Vladimir Kasemi

Polytechnic University of Tirana, Albania

Abstract

Taking the analysis of transient processes caused by direct lightning strike in concern, it becomes

necessary to know the parameters of the lightning protection system. Protection systems are

airborne, both used in various civilian and military sites and in the underground ones, thus

being called the Protective [1] Earthing Systems. For the sake of calculation, we are providing

below with the formulas for calculating dierent parameters. If the maximum frequency of

the lightning strike current spectrum, fmax, is known, then we can nd the minimum length

that the segment, part of the conductor with which the earthing network is built, must have.

Keywords: Parameters Calculation, Protective Earthing Systems.

Introduction

The minimum conductor length is part of the minimum wavelength. This criterion

serves to use the quasi-static approximation of the electric and magnetic eld, aiming

to calculate parameters such as capacity, static inductance of the respective segment,

on a given length [2]. If we denote by

λ

the wavelength on the ground, which is less

than the corresponding wavelength in the air, then:

β

π

λ

⋅

=2

(1)

2

1

2

])1)(1[

2

1

(++=

ωε

σ

µεωβ

(2)