Electrical Characterization of Dibenzyltoluene Liquid at High Temperatures up to 350°C

Muslim, Joko; Lesaint, Olivier; Hanna, Rachelle; Reboud, Jean-Luc; Sinisuka, Ngapuli I.

doi:10.1109/ceidp.2018.8544791

Cited by 18 publications

(6 citation statements)

References 5 publications

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“…On the other hand, the fact that breakdown voltage of DBT under (quasi) uniform field decreases with temperature [11] seems contradict to the PDIV increase with temperature. This comes from the rather contrast circumstances in both measurements.…”

Section: Discussionmentioning

confidence: 96%

Discharges and Streamers Properties in Dielectric Liquids under Various Temperature

Muslim

Lesaint

Hanna

et al. 2020

2020 International Conference on Technology and Policy in Energy and Electric Power (ICT-PEP)

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This paper presents partial discharges and streamers characterizations on 3 dielectric liquids under variation of wide temperature range, i.e.: aromatic hydrocarbon dibenzyltoluene, synthetic ester and halogenic perfluoropolyether liquids. Results indicate distinct behaviors among these liquids under highly divergent AC sinusoidal and impulse electric field. Dibenzyltoluene demonstrates excellent feature in suppressing discharges even at elevated temperature. In synthetic ester, positive discharges appeared to be less numerous but extremely high up to several nC in amplitude are strongly related to the further breakdown. Streamers inception voltage which denotes the initial discharges properties and streamer propagation velocity varies from several m/s up to order of km/s, show less dependency to temperature instead of the intrinsic characteristic of liquid itself. These prebreakdowns phenomena constitute interesting information in planning and selecting insulation liquids and analyzing fundamental mechanism during the operation and maintenance for HV utility applications.

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Section: Discussionmentioning

confidence: 96%

Discharges and Streamers Properties in Dielectric Liquids under Various Temperature

Muslim

Lesaint

Hanna

et al. 2020

2020 International Conference on Technology and Policy in Energy and Electric Power (ICT-PEP)

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“…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].…”

Section: Mitigation Methodsmentioning

confidence: 99%

“…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.…”

Section: Mitigation Methodsmentioning

confidence: 99%

“…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.…”

Section: Mitigation Methodsmentioning

confidence: 99%

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

Zhang

Ghassemi

Zhang

2021

IEEE Trans. Dielect. Electr. Insul.

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This manuscript critically reviews recent research on electrical insulation materials and systems used in power electronics devices and focuses on electrical treeing in silicone gel, PD modeling, and mitigation methods. For mitigation methods, electric field grading techniques, such as 1) various geometrical techniques, and 2) applying nonlinear dielectrics are discussed. Alternatives for silicone gel, such as liquid dielectrics, are also highlighted. The drawbacks of reported research and technical gaps are identified. In particular, we show that the investigations carried out to date are in their infancy regarding the working conditions targeted for next-generation WBG power devices. This review will provide a useful framework and point of reference for future research.

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“…Silicone gel is used for encapsulation to prevent in situ electrical discharges in air and to protect substrates, semiconductors and connections against humidity, dirt and vibration. Although alternatives have been researched [6][7][8], silicone gel, which is a weaker insulator than dielectric ceramics and more vulnerable to PDs, is still the only option for encapsulation of WBG power modules. A thorough and in-depth review of PD measurements, failure analyses and control in high-power Si-Insulated-gate bipolar transistor (IGBT) modules has been done in [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Finite Element Analysis Model for Partial Discharges in Silicone Gel under a High Slew Rate, High-Frequency Square Wave Voltage in Low-Pressure Conditions

Borghei

Ghassemi

2020

Energies

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Wide bandgap (WBG) devices made from materials such as SiC, GaN, Ga2O3 and diamond, which can tolerate higher voltages and currents compared to silicon-based devices, are the most promising approach for reducing the size and weight of power management and conversion systems. Silicone gel, which is the existing commercial option for encapsulation of power modules, is susceptible to partial discharges (PDs). PDs often occur in air-filled cavities located in high electric field regions around the sharp edges of metallization in the gel. This study focuses on the modeling of PD phenomenon in an air filled-cavity in silicone gel for the combination of (1) a fast, high-frequency square wave voltage and (2) low-pressure conditions. The low-pressure condition is common in the aviation industry where pressure can go as low as 4 psi. To integrate the pressure impact into PD model, in the first place, the model parameters are adjusted with the experimental results reported in the literature and in the second place, the dependencies of various PD characteristics such as dielectric constant and inception electric field on pressure are examined. Finally, the reflections of these changes in PD intensity, duration and inception time are investigated. The results imply that the low pressure at high altitudes can considerably affect the PD inception and extinction criterion, also the transient state conditions during PD events. These changes result in the prolongation of PD events and more intense ones. As the PD model is strongly dependent upon the accurate estimation electric field estimation of the system, a finite-element analysis (FEA) model developed in COMSOL Multiphysics linked with MATLAB is employed that numerically calculates the electric field distribution.

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Electrical Characterization of Dibenzyltoluene Liquid at High Temperatures up to 350°C

Cited by 18 publications

References 5 publications

Discharges and Streamers Properties in Dielectric Liquids under Various Temperature

Discharges and Streamers Properties in Dielectric Liquids under Various Temperature

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

A Finite Element Analysis Model for Partial Discharges in Silicone Gel under a High Slew Rate, High-Frequency Square Wave Voltage in Low-Pressure Conditions

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