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Calculating ac/dc resistance ratios for high-pressure oil-filled cable Designs. Volume 1. Designer's guide. Final report

Technical Report ·
OSTI ID:5802162
; ;

Using electromatic field theory, a new method is developed for calculating alternating current in power cables installed in pipes of carbon steel (magnetic pipes). The technique for evaluating these losses is based on the method of images which replaces complicated distribution of currents in the system with a sequence of thin conductors. The method not only gives a mathematical framework for the solution of alternating current losses, but it also gives the underlying physical picture of effects contributing to these losses. Skin effect, proximity effect and losses due to the pipe are calculated separately. For the first time, the increase of losses in the conductors, when the cables are placed in a magetic pipe, are analyzed mathematically. Good agreement is obtained between the result of calculations and the experimentally determined ac-dc resistance ratios for pipe-type cables with concentric stranded copper conductors and also for cables with aluminum or copper segmental conductors when appropriate factors modifying conductor resistance to account for the effect of segmenting are introduced. Volume 1 of the report is the designer's guide containing all the formulas and tables necessary for performing the calculations while Volume 2 presents the theoretical background of the method.

Research Organization:
Cable Technology Labs., Inc., New Brunswick, NJ (USA)
OSTI ID:
5802162
Report Number(s):
EPRI-EL-3977-Vol.1; ON: TI85920602
Country of Publication:
United States
Language:
English

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Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
ALLOYS
ALTERNATING CURRENT
CABLES
CARBON STEELS
CONDUCTOR DEVICES
CURRENTS
ELECTRIC CABLES
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ENERGY LOSSES
EQUATIONS
EQUIPMENT
IRON ALLOYS
IRON BASE ALLOYS
LOSSES
OIL-FILLED CABLES
PIPES
POWER LOSSES
STEELS