Effect of Dry Zone Formation around Underground Power Cables on Their Ratings

Ossama E Gouda; Adel Z. El Dein; Ghada M Amer

doi:10.2202/1553-779X.2071

Article

Effect of Dry Zone Formation around Underground Power Cables on Their Ratings

Ossama E Gouda , Adel Z. El Dein and Ghada M Amer

Published/Copyright: June 25, 2009

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From the journal International Journal of Emerging Electric Power Systems Volume 10 Issue 3

As it is known, there are many factors affecting underground power distribution cables' loadings such as ambient temperature, cable depth laying, number of cable parallel circuits and thermal resistivity of the soil. One important factor usually ignored is the formation of dry zones around the underground power cables due to cable loading. Dry zones usually form around underground power cables under loading condition due to the migration of soil moisture content. In this paper the effect of dry zone formation on the underground power cables ampacity is investigated. De-rating factor for the formation of dry zone around underground power cables is suggested and calculated for different types of natural backfill soils. IEC 60287-1-3 is taken as reference. Experimental work is done to study the dry zone phenomena of each type of soil.

Keywords: cable ampacity; de-rating factor; dry zone; temperature distribution

Published Online: 2009-6-25

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Articles in the same Issue

https://doi.org/10.2202/1553-779X.2071

Keywords for this article

cable ampacity; de-rating factor; dry zone; temperature distribution