TY - GEN
T1 - Loss and Thermal Modeling of Metal Oxide Varistors (MOV) Under Standard Current Surge Mission Profile
AU - Vernica, Ionut
AU - Jensen, Per Thåstrup
AU - Wang, Huai
AU - Iannuzzo, Francesco
AU - Otto, Susanne
AU - Blaabjerg, Frede
PY - 2019/9
Y1 - 2019/9
N2 - Because of their crucial role in protecting power electronic equipment against over-voltages and transients, metal oxide varistors (MOV) represent a key component of the electrical system. Although improper heat dissipation and internal temperature rises can lead to a significant decrease in performance or even to a wear-out failure of the MOV, there are very few studies in the literature describing the thermal modeling of varistors. Thus, in this paper, an instantaneous loss and thermal modeling procedure for MOV under a standard current surge mission profile is proposed. Initially, the specification and characteristics of a study-case varistor are presented, followed by a detailed description of the electro-thermal modeling procedure. Afterwards, the thermal behavior of the MOV is investigated and the differences between the heating and cool-down thermal models are highlighted. Finally, in order to validate the proposed electrothermal models, the temperature of the varistor is measured with an infrared camera. The experimental measurements are in well agreement with the simulation results, and thus, providing an initial validation of the proposed modeling procedure.
AB - Because of their crucial role in protecting power electronic equipment against over-voltages and transients, metal oxide varistors (MOV) represent a key component of the electrical system. Although improper heat dissipation and internal temperature rises can lead to a significant decrease in performance or even to a wear-out failure of the MOV, there are very few studies in the literature describing the thermal modeling of varistors. Thus, in this paper, an instantaneous loss and thermal modeling procedure for MOV under a standard current surge mission profile is proposed. Initially, the specification and characteristics of a study-case varistor are presented, followed by a detailed description of the electro-thermal modeling procedure. Afterwards, the thermal behavior of the MOV is investigated and the differences between the heating and cool-down thermal models are highlighted. Finally, in order to validate the proposed electrothermal models, the temperature of the varistor is measured with an infrared camera. The experimental measurements are in well agreement with the simulation results, and thus, providing an initial validation of the proposed modeling procedure.
KW - Metal oxide varistor
KW - Surge current
KW - Power loss model
KW - Thermal model
UR - http://www.scopus.com/inward/record.url?scp=85076788682&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2019.8913287
DO - 10.1109/ECCE.2019.8913287
M3 - Article in proceeding
SN - 978-1-7281-0396-9
T3 - IEEE Energy Conversion Congress and Exposition
SP - 7113
EP - 7117
BT - 2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019
PB - IEEE Press
CY - USA
T2 - 2019 IEEE Energy Conversion Congress and Exposition (ECCE)
Y2 - 29 September 2019 through 3 October 2019
ER -