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Life loss of insulated power cables: an integrative criterium to improve the ANSI/IEEE and the CENELEC/IEC method for overload protection

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3 Author(s)
Parise, G. ; Dept. of Electr. Eng., Rome Univ., Italy ; Rubino, G. ; Ricci, M.

A comparison between the ANSI/IEEE and the CENELEC/IEC approach to overload protection of electric cables has allowed a determination of which of the two methods is more restrictive depending on power cable size and overload duration. This paper introduces a methodology to calculate the life-loss of a power cable due to an overload current of given magnitude and duration. The proposed methodology is then applied to repeat the above-mentioned comparison between ANSI/IEEE and CENELEC/IEC in more objective terms, that is to say by determining the actual ageing of power cables caused by the overloads they could experience in service as a consequence of: the prescribed operating currents in conventional time of protective devices, within the CENELEC/IEC rules; and the admissible emergency loading temperatures and currents in the case of the ANSI/IEEE standards. Therefore it has been outlined an innovative and versatile criterium to protect cables against overloads: innovative because, unlike the traditional ANSI/IEEE and CENELEC/IEC methods, it is based on the prescription of the cable life-loss considered expendable to face an overload (it has been assumed that the progressive life-loss could be checked by a smart protective device provided with a simple electronic controller able to perform the proposed calculating methodology); versatile because the admissible life-loss can be varied according to plant configuration

Published in:

Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE  (Volume:4 )

Date of Conference:

6-10 Oct 1996

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