Optimization of power cable rating

Pao Yue-kong Library Electronic Theses Database

Optimization of power cable rating


Author: Kwong, Chung-lun
Title: Optimization of power cable rating
Degree: M.Sc.
Year: 1996
Subject: Electric cables
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: 123, [49] leaves : ill. ; 31 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1234949
URI: http://theses.lib.polyu.edu.hk/handle/200/5059
Abstract: Utilities have many incentives to uprate power transmission system rather than install new circuit. These incentives include substantial cost savings, reducing or eliminating time-consuming siting procedures, and reducing time need to complete construction operations. Underground transmission cable are especially suitable for uprating because of their high cost compared to overhead lines and the options available to increase ampacity by controlling the cable thermal circuit. The accurate prediction of thermal condition in a cable is of prime importance and consideration of the capital cost at the voltage and power level under study, quite small differences in predicted rating represent considerable sum of money. It is essential therefore that the process of calculation and modelling be as accurate and realistic as possible. The maximum normal loads can be achieved without any change in the existing arrangement or operating philosophy with the implantation of a new cable rating calculation model. The maximum emergency loads can be achieved with the improved method with taking account on the daily load variations. Moreover, the thermal environment of underground power cable in Hong Kong with a view to increase their current rating is discussed in this thesis. Procedure has been developed to monitor the temperature rise of existing underground cable within the company. The system can be used to obtain the temperature of the tested cable and the remote ambient soil temperature. All results show good agreement between the measured temperature and the calculated temperature from the improved model. The comparison is also carried out with IEC287 model (a international standard) and the Neher-McGrath analytical procedure (a wide accepted procedure in United America).

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