Abstract
This paper focuses on the space charge behavior in oil-paper insulation systems used in power transformers. It begins with the importance of understanding the space charge behavior in oil-paper insulation systems, followed by the introduction of the pulsed electrostatic technique (PEA). After that, the research progress on the space charge behavior of oil-paper insulation during the recent twenty years is critically reviewed. Some important aspects such as the environmental conditions and the acoustic wave recovery need to be addressed to acquire more accurate space charge measurement results. Some breakthroughs on the space charge behavior of oil-paper insulation materials by the research team at the University of Southampton are presented. Finally, future work on space charge measurement of oil-paper insulation materials is proposed.
Highlights
High Voltage Direct Current (HVDC) systems have been used for energy transmission since the 1950s
These severe conditions include the overvoltage from lightning and switching, the combined AC and DC voltage, and the polarity reversal applied at the DC side windings
The pulsed electroacoustic (PEA) technique was developed in the 1980s
Summary
High Voltage Direct Current (HVDC) systems have been used for energy transmission since the 1950s. In comparison with the conventional transformers used in HVAC transmission systems, converter transformers have a more complex structure and operate under more severe conditions. These severe conditions include the overvoltage from lightning and switching, the combined AC and DC voltage, and the polarity reversal applied at the DC side windings. Measurements of space charge dynamics in oil-paper insulation materials. Southampton on oil-paper insulation has been critically conducted by the University of Southampton on oil‐paper insulation materials has been critically analyzed. Future work will be proposed to predict the future research trends of space charge analyzed. Future work will be proposed to predict the future research trends of space charge behavior in the oil-paper insulation materials.
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