Analysis of ground return impedance calculation methods for modeling of  underground cables for lightning studies

Melih GÜNERİ; Bora ALBOYACI

Makale detayları

Analysis of ground return impedance calculation methods for modeling of underground cables for lightning studies

Yazarlar:

Melih GÜNERİ | Bora ALBOYACI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Electrical Engineering and Computer Science 2018 Vol.26 Issue 1, pp.530-541

Belge Tipi:

Makale

Yayın Tarihi:

1/2018

Belge Dili:

Türkçe

Document ID (Org No.):

2000735530

Sıklık:

İki Aylık

eISSN:

1303-6203

pISSN:

1300-0632

Özet:

 

Analysis of lightning transients in cable systems necessitates accurate calculation of ground return impedances  (GRIs) in high-frequency regions. EMT-type programs used for transient analyses incorporate various methods for  calculation of GRI. Most of these methods include assumptions and approximations, the validity of which needs to be  questioned at high frequencies. In particular, the common approximation of the neglecting effect of displacement currents  should be reviewed. The purpose of this paper is to evaluate commonly used GRI calculation methods in terms of their  accuracy and validity in high-frequency regions. In this study, GRI calculation methods are analyzed and compared, the  effect of displacement currents is evaluated, and validity ranges of the basic calculation formula (Pollaczek formula) are  discussed. It is shown that for high-resistivity and high-permittivity soil cases, the effect of displacement currents must  be taken into account in high-frequency regions. Most default calculation routines in EMT-type programs neglect this  effect. Therefore, it is very important to review and understand the calculation methods used in EMT-type programs  before employing them in high-frequency transient analyses. Moreover, it is shown that in most of the practical cases  the basic calculation formula (Pollaczek formula) is valid for the frequency range of interest for lightning studies.

Makale detayları

Analysis of ground return impedance calculation methods for modeling of underground cables for lightning studies

Yazarlar: Melih GÜNERİ | Bora ALBOYACI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Electrical Engineering and Computer Science 2018 Vol.26 Issue 1, pp.530-541

Belge Tipi: Makale

Yayın Tarihi: 1/2018

Belge Dili: Türkçe

Document ID (Org No.): 2000735530

Sıklık: İki Aylık

eISSN: 1303-6203

pISSN: 1300-0632

Sayı

Yazarlar:

Melih GÜNERİ | Bora ALBOYACI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Electrical Engineering and Computer Science 2018 Vol.26 Issue 1, pp.530-541

Belge Tipi:

Makale

Yayın Tarihi:

1/2018

Belge Dili:

Türkçe

Document ID (Org No.):

2000735530

Sıklık:

İki Aylık

eISSN:

1303-6203

pISSN:

1300-0632