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Effect of temperature on the breakdown voltage of paper-covered conductor impregnated with various liquids

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3 Author(s)

Lengths of flat copper conductor insulated with aromatic polyamid (aramid) tape or cellulose tape were bent into rings and secured around the edge of discs. Two discs were placed edge-to-edge in one plane and breakdown voltages were measured between the conductors. The conductor assemblies were dried under vacuum, impregnated and immersed in several low-flammability liquids at temperatures up to 180°C under air. Comparisons were made with mineral oil which was tested up to 130°C under nitrogen. With the discs set to provide a 1-mm liquid gap between the insulated conductors, the variation of breakdown voltage with temperature is limited to a few percent and values tend to their highest at 80°C for both AC and lightning impulse. With the conductors in contact, alternating breakdown voltages vary little, whereas impulse voltages fall appreciably with temperature rise, especially for cellulose

Published in:

Electrical Insulation, IEEE Transactions on  (Volume:23 ,  Issue: 3 )