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Converter transformers are suffered from DC voltage, DC voltage with AC voltage and polarity reversed voltage additionally, compared with common power transformers. Under DC voltage it is easy to form space charge in oil-paper insulation. The formation, distribution and mobility of space charge will affect its dielectric performance. What's more the insulation system is easier to fail under polarity...
In order to understand effects of oil thermal aged state on space charge behaviors in oil-paper insulation further, transformer oil with different aged states is prepared by accelerated thermal aging. What's more analysis on physical and chemical properties of oil is made. The samples are made of new kraft paper which is dried in vacuum and oil with different thermal aged states. The pulsed electro-acoustic...
Oil-paper compound insulation has been widely used in power transformers for quite a long time because of its good performance. The paper insulation degrades under the combined stresses of thermal, electrical and chemical stresses during routine operations, resulting in the reduction of its degree of polymerization (DP) and hence its mechanical and electrical strength. Space charges in a dielectric...
To investigate the effect of pressboard aged states on its time domain dielectric characteristics, a series of experiments are designed and carried out to measure polarization and depolarization currents (PDC) of different aged pressboard samples. New pressboard samples immersed in new transformer oil are accelerated thermally aged for different time intervals. The aged oil-pressboard samples are...
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