Inception and Breakdown Voltage of the Oil-Wedge Type Electrode Model Insulated with Bio-based Hydrocarbon and Mineral Oil

This paper includes the results of the measurements of inception and breakdown voltage of the oil-wedge type electrode model under standard lightning impulse voltage of positive polarity. The measurements were performed for Nytro Bio 300X transformer oil representing a new type of dielectric liquid namely bio-based hydrocarbon as well as Nytro 10XN representing uninhibited mineral oil. They were intended to compare between each other the mentioned dielectric liquids in terms of specified voltage stress. The inception voltage was assessed on the basis of light signal emitted by developing discharges collected with the use of photomultiplier. The results show that both liquids in the condition of experiment behave similarly; both in terms of inception voltage as well as lightning impulse breakdown voltage the obtained values are almost identical indicating on possibility to directly replace mineral oil by bio-based product.