Streamer Generation and Propagation in Dibenzyltoluene and Ester Liquids under High Temperature

Temperature dependence of the pre-breakdown and breakdown phenomena in natural esters under AC stress

“…The role of the resistance ( ) connected in series with the test cell was to limit the leakage current. According to [8 ] the value of shunt resistance was set to 100 Ω. The voltage drop across this resistor was recorded continuously and used to compute the leakage current.…”

“…The temperature dependence of the ester fluids and associated breakdown behaviour has been least emphasised in the literature. The effect of temperature on the pre‐breakdown phenomena of ester fluids has been investigated by a few researchers [8 ]. However, only high‐temperature effects have been emphasised.…”

Insulation Materials and Systems for Power Electronics Modules: A Review Identifying Challenges and Future Research Needs

“…Four solutions have been proposed for electric field reduction and PD control within envisioned high voltage, compact packaging design of power modules: 1) geometrical techniques [56][57][58][59][60], 2) applying nonlinear field-dependent conductivity (FDC) materials as coatings on high field regions [61] or field-dependent permittivity (FDP) fillers in silicone gel [62], 3) using high-temperature (up to 350°C) insulating liquids as a potential replacement for silicone gels [63][64][65], and 4) combined geometrical techniques and applying nonlinear field-dependent conductivity layers [66][67][68][69][70][71][72].…”

“…Although the dielectric strength of a high temperature nonpolar dibenzyltoluene (DBT) liquid, Jarytherm® DBT [73], proposed in [63][64][65] as an encapsulant in high-temperature power electronics modules is higher than other dielectric liquids, such as mineral oil or esters at 20 °C, its dielectric strength at 350 °C decreases to about 58% of its initial value at 20 °C. However, PD measurements in [65] shows promising results for these high temperature liquids as an alternative for silicone gel.…”

“…However, PD measurements in [65] shows promising results for these high temperature liquids as an alternative for silicone gel. To the best of our knowledge, there are only three papers [63][64][65] (all are conference papers) proposing DBT as an alternative for silicone gel for high-temperature WBG power modules. The low number of papers on this topic and their publication year (2018, 2019) indicates that this topic is very immature.…”