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Multi-layer insulations are commonly used in HVDC applications, giving rise to physical and chemical interfaces in the insulation systems. Space charges at the interface between insulators play crucial roles on the electric field distribution of such insulation systems. The issue arises in the design of high voltage direct current (HVDC) insulations. How to understand the behaviors, mechanisms and...
In order to study the effect of space charge on oil flow electrification under DC voltage, an experimental model with plane electrode was designed. A closed oil circulating system was built to simulate the oil path between the windings inside a converter transformer. The results reveal that polarity of streaming current depends on the sample configuration. If the high voltage electrode was covered,...
In the insulation of converter transformers for HVDC transmission, the effect of space charges on field distortion is an important factor. Multilayers of oil immersed papers and oil gaps that compose paper/paper and paper/oil interfaces are used in converter transformers. The interface charge behaviors may not follow traditional Maxwell-WagnarSillars polarization law. In this report, the measurement...
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