The fourth part of the column reviews and summarises relevant studies on the critical relationship between the breakdown voltage (BDV) and temperature, providing insights and recommendations for further research. Different types of contaminants in different types of insulating liquids under certain conditions increase BDV with increasing temperature (positive dependence), whereas in others, it may reduce BDV (negative dependence). Additionally, the duration of exposure at specific temperatures and the direction of temperature change can significantly affect the instantaneous BDV value. The limited (only four sources) and sometimes conflicting data on the variation coefficient (CV%) underline the need for further systematic investigation, especially for new and alternative insulating liquids.
The statistical scatter of breakdown voltages of transformer oil – Part IV
The fourth part of the column reviews and summarises relevant studies on the critical relationship between the breakdown voltage (BDV) and temperature.
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