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HVDC equipment is normally stressed with AC, DC and super-imposed stresses during its operation time. Contrary to AC field distribution, DC field stresses are determined by the conductivity of the insulating materials, which consist of insulating liquid and cellulose-based transformer board. As a result, a deep knowledge of the permittivity and conductivity of barrier-oil insulation materials are...
Natural ester liquids as insulation material in power transformers offer many advantages compared to conventional mineral oils. Some have, for example, higher thermal capacity, higher flash/fire points and better environmental sustainability. Despite several studies confirmed the equivalent dielectric capacity for the typical construction elements of transformers, some studies representing extremely...
Since the early 1980s, Cooper Power Systems has been actively involved in exploring and developing ester-based dielectric fluids. Introduced in 1984, our first commercialized ester was a synthetic polyol ester, developed primarily as an environmentally acceptable Askarel substitute. Although its technical performance is very good, the cost is prohibitive for most applications. The desirable properties...
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