Abstract
Electrical treeing is among the main mechanisms responsible for electric breakdown in polymeric high voltage cables. In this paper, electrical treeing in electro-thermally aged low density polyethylene (LDPE) was evaluated by means of a real-time microscopic detection system. A wire – plane electrode test object with semiconducting tab was used in the study. The ageing was performed at a constant temperature of 80°C and an applied DC voltage of 10 kV of both polarities and lasted from 100 up to 800 hours. For testing the resistances to electrical treeing, tests were performed by applying 50 Hz AC voltage at a ramping speed of 0.5 kV/s. The obtained experimental results showed that mainly the thermal component of the ageing had an influence on electrical treeing parameters, namely on the initiation voltage as well as the shape and occurrence frequency of the trees. With an increase of the ageing time, the tree inception voltage gradually decreased.
Highlights
Electrical treeing is among the main mechanisms responsible for electric breakdown in polymeric high voltage cables
Since the second half of the 20th century polymeric insulating materials have been widely used in high voltage insulation systems
For future long distance transmission, the high voltage direct current (HVDC) technology is considered as the most feasible technical and economic solution and especially extruded polymeric cables are to be used as a mean for electric energy transportation
Summary
Electrical treeing is among the main mechanisms responsible for electric breakdown in polymeric high voltage cables. Electrical treeing tests were performed in a set-up, shown, equipped with a custom made sample holder, under a 50 Hz ramping AC voltage (provided by a 75 kV transformer) with a ramping speed of 0.5 kV/s.
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