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Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling

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  • Flaviu Mihai Frigura-Iliasa

    (Power Systems Department, Faculty of Electrical and Power Engineering, Politehnica University of Timisoara, 300223 Timisoara, Romania
    National Institute for Research and Development in Electrochemistry and Condensed Matter, 300223 Timisoara, Romania)

  • Sorin Musuroi

    (Electrical Engineering Department, Faculty of Electrical and Power Engineering, Politehnica University of Timisoara, 300223 Timisoara, Romania
    Romanian Academy of Scientists, Timisoara Branch, 300223 Timisoara, Romania)

  • Ciprian Sorandaru

    (Electrical Engineering Department, Faculty of Electrical and Power Engineering, Politehnica University of Timisoara, 300223 Timisoara, Romania)

  • Doru Vatau

    (Power Systems Department, Faculty of Electrical and Power Engineering, Politehnica University of Timisoara, 300223 Timisoara, Romania)

Abstract

Metal oxide varistors are applied today inside modern surge arresters for overvoltage protection for all voltage levels. Their main issue is the thermal activation of their crossing current, which could lead to complete destruction by thermal runaway. This article presents a new technological solution developed in order to increase the thermal stability of metal oxide varistors. It consists in connecting in parallel two or more similar varistors (for dividing their current), having a thermal coupling between them (for equalizing their temperatures and forcing them to act together and simultaneously as much as possible). Starting from a finite element computer model performed for each situation (varistor standalone or parallel), up to real measurements, the thermal stability of the equipment was analyzed in permanent and impulse regime. Experiments were carried out in the same conditions. Experimental data obtain from two disk varistors corresponds very well to simulations, proving that parallel connection of varistors, combined with a thermal exchange between them is an efficient technical solution for thermal stability improvement, even if not apparently economically justified.

Suggested Citation

  • Flaviu Mihai Frigura-Iliasa & Sorin Musuroi & Ciprian Sorandaru & Doru Vatau, 2019. "Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling," Energies, MDPI, vol. 12(3), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:3:p:536-:d:204273
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    References listed on IDEAS

    as
    1. Christos A. Christodoulou & Vasiliki Vita & Valeri Mladenov & Lambros Ekonomou, 2018. "On the Computation of the Voltage Distribution along the Non-Linear Resistor of Gapless Metal Oxide Surge Arresters," Energies, MDPI, vol. 11(11), pages 1-14, November.
    2. Zhen Fang & Bowen Wang & Jiazheng Lu & Zhenglong Jiang, 2018. "Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line," Energies, MDPI, vol. 11(7), pages 1-13, July.
    3. Jiazheng Lu & Pengkang Xie & Zhen Fang & Jianping Hu, 2018. "Electro-Thermal Modeling of Metal-Oxide Arrester under Power Frequency Applied Voltages," Energies, MDPI, vol. 11(6), pages 1-13, June.
    4. Nurul A. A. Latiff & Hazlee A. Illias & Ab H. A. Bakar & Sameh Z. A. Dabbak, 2018. "Measurement and Modelling of Leakage Current Behaviour in ZnO Surge Arresters under Various Applied Voltage Amplitudes and Pollution Conditions," Energies, MDPI, vol. 11(4), pages 1-16, April.
    Full references (including those not matched with items on IDEAS)

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