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Given the adoption of ultrahigh-voltage ac and dc power transmission, it is desirable to develop a new kind of oil-paper insulation system, with higher dielectric strength and smaller volume compared with conventional insulation systems, in order to reduce the volume and mass of high-voltage power transformers and improve their long-term operational reliability 1, 2. Methods of improving the dielectric properties of the oil-paper insulation have therefore been widely investigated 3, 4. The most influential factors affecting the performance of oil-paper insulation systems are the low dielectric strength of transformer oil and its degradation caused by water and other contaminants 5. The dielectric strength of oil-paper insulation may be increased by filtering the oil in order to remove water and other contaminants 6. However, further increase in the dielectric strength of the oil is required in order to achieve reduction of transformer volume and mass.
Lv et al. (Tue,) studied this question.