Design and development of dc cables

Journal Article · Tue Feb 28 23:00:00 EST 1967 · IEEE Trans. Power Appar. Syst.; (United States)

DOI:https://doi.org/10.1109/TPAS.1967.291957· OSTI ID:5945337

Oudin, J M; Fallou, M; Thevenon, H

The first problem which arises concerning dc cables is determination of the gradient distribution within the insulation. It is shown that the dielectric absorption phenomena may be neglected, for they give only space gradient distortion at the scale of a paper fiber, which does not seem to have an effect upon the practical dielectric strength of an insulation. Then, the gradient distribution is investigated as a function of the conductivity of the insulator, which varies with temperature and gradient. Consequently, the heating of the conductor tends to shift the maximum stress from the inner to the outer layers of the insulation, while the voltage increase tends to make the stress uniform. The dc breakdown gradients calculated according to the stated laws lead to a value of dielectric strength practically equal to that obtained during impulse tests, except for high temperatures.

• OSTI ID: 5945337
• Journal Information: IEEE Trans. Power Appar. Syst.; (United States), Journal Name: IEEE Trans. Power Appar. Syst.; (United States) Vol. 86; ISSN IEPSA
• Country of Publication: United States
• Language: English

Related Subjects

200302* -- Power Transmission & Distribution-- DC Systems-- (1989-)
24 POWER TRANSMISSION AND DISTRIBUTION
CABLES
CONDUCTOR DEVICES
DC SYSTEMS
DESIGN
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
ELECTRIC CABLES
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATION
ELECTRICAL PROPERTIES
EQUIPMENT
PAPER
PHYSICAL PROPERTIES
POWER SYSTEMS
STRESSES