Effects of non-linear protective devices in cable systems under energisation conditions

• Published in: Energy conversion and management 1997-12, Vol.38 (18), p.1847-1867
• Main Author: Abdel-Gawad, Nagat M.K.
• Format: Article
• Language: English
• Subjects: Applied sciences; Disturbances. Regulation. Protection; Electrical engineering. Electrical power engineering; Electrical power cable systems; Electrical power engineering; Exact sciences and technology; Non-linear protective device; Power networks and lines; Switching
• ISSN: 0196-8904; 1879-2227
• DOI: 10.1016/S0196-8904(96)00112-4

This paper investigates the transient performance of cable systems under energisation conditions, including the non-linear effects of surge divertors which are used as sheath voltage limiters. The method of solution developed and used is based on the modified Fourier transform technique in conjunction with model analysis. The non-linear effects of surge divertors are included by the use of Duhamel's integral. Mathematical formulations of the transient responses are also given. Both the Cross-bonded and Single-point bonded electrical power cable systems are considered in the study. In the study, the frequency-dependent characteristics of system parameters, in particular skin-effect and effect of the earth-return path, are taken into account in obtaining the transient solutions. Particular attention is given to systems which include cross-bonded cables. The effects of various system parameters, such as source impedance, system length and sheath earthing-resistance, on the transient performance of the systems, as well as on the surge divertor responses, are investigated.