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Eddy-current losses in multi-core paper-insulated lead-covered cables, armoured and unarmoured, carrying balanced 3-phase current

 

作者: A.H.M.Arnold,  

 

期刊: Journal of the Institution of Electrical Engineers - Part II: Power Engineering  (IET Available online 1941)
卷期: Volume 88, issue 1  

页码: 52-63

 

年代: 1941

 

DOI:10.1049/ji-2.1941.0008

 

出版商: IEE

 

数据来源: IET

 

摘要:

This report deals with an investigation of eddy-current losses in multi-core circular-conductor and shaped-conductor paper-insulated wire-armoured cables, and the development of formulae by means of which the losses can be computed. The experimental work covers tests with balanced three-phase currents at frequencies from 25 to 300 cycles per second.The eddy-current losses are divided into four parts, namely, skin effect, proximity effect, lead-sheath effect, and armouring effect. The ratio of a.c. to d.c. resistance of the conductors, calculated by the appropriate formula, is, with one exception, within 5% of the measured value under all the conditions covered by the investigation, the average difference between calculation and measurement being only 1%.

 

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