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Since gas evolvement deteriorates the dielectric properties of insulating fluid, its ability to resist decomposition under electrical discharge is of paramount importance for the safety of power transformers. In this contribution, the ability of various fluids to resist decomposition under electrical discharge is investigated. Mineral based transformer oil was included in the test matrix to provide...
This paper emphasizes the factors to be considered when designing power connectors used in the load and temperature tests of power transformers. External conductors used to perform load and temperature tests in transformers are referred as power connectors in this contribution. Electrical and thermal investigations of a single-phase shell-type, 300 MVA, 400 kV–21.5 kV power transformer connector were...
Knowing that insulating fluid is a weak link in a composite or impregnated dielectric system with reference to both dielectric strength and ease of contamination, many investigators have devoted great efforts to investigate various fluids. Increasing demand for environmentally friendly materials in the industry have driven the research and development efforts of natural/synthetic esters and less-flammable...
Transformer oil is expected to function as an insulating medium and heat transfer agent. In this contribution, contaminants that mostly influence the electrical and thermal properties of transformer oil are addressed. To access the influence of the type of impurities on oil properties, various scenarios were considered. Investigations were therefore performed on new oil, new oil submitted to electrical...
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