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Under the HVDC condition, the formation of the space charge in the oil paper system could affect the electric field distribution for converter transformers. Therefore, it is important to analyze the factors that determine the space charge behavior such as the temperature, moisture, electric field, oil paper thickness ratio and multilayers such as (Oil+Paper+Oil+Paper) structure. This paper focuses...
Space charge effects in two different types of thermally aged oil-paper which are traditional mineral oil and synthetic ester MIDEL 7131 immersed paper, were tested and compared. The results show that a few days standing time between the ageing processes and following experiments are necessary to achieve water equilibrium. With thermal ageing conducted, more charges were injected into the oil-paper...
As we know, streaming electrification due to oil flow is an important phenomenon in power transformers particularly on those high rated voltage ones, and the study around it is still a challenge. In this paper, the streaming electrification characteristic of insulation mineral oil from Nynas was studied by using an improved mini-static tester to measure the electrostatic charging tendency (ECT) of...
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