Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling
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 soluti...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/3/536 |
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| author | Flaviu Mihai Frigura-Iliasa Sorin Musuroi Ciprian Sorandaru Doru Vatau |
| author_facet | Flaviu Mihai Frigura-Iliasa Sorin Musuroi Ciprian Sorandaru Doru Vatau |
| author_sort | Flaviu Mihai Frigura-Iliasa |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T13:05:55Z |
| format | Article |
| id | doaj.art-4d6ff150f4ae40ad943e45b2a713bb3f |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:05:55Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-4d6ff150f4ae40ad943e45b2a713bb3f2022-12-22T04:22:46ZengMDPI AGEnergies1996-10732019-02-0112353610.3390/en12030536en12030536Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal CouplingFlaviu Mihai Frigura-Iliasa0Sorin Musuroi1Ciprian Sorandaru2Doru Vatau3Power Systems Department, Faculty of Electrical and Power Engineering, Politehnica University of Timisoara, 300223 Timisoara, RomaniaElectrical Engineering Department, Faculty of Electrical and Power Engineering, Politehnica University of Timisoara, 300223 Timisoara, RomaniaElectrical Engineering Department, Faculty of Electrical and Power Engineering, Politehnica University of Timisoara, 300223 Timisoara, RomaniaPower Systems Department, Faculty of Electrical and Power Engineering, Politehnica University of Timisoara, 300223 Timisoara, RomaniaMetal 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.https://www.mdpi.com/1996-1073/12/3/536metal oxide varistordisk shapelow voltageparallel connectionthermal coupling |
| spellingShingle | Flaviu Mihai Frigura-Iliasa Sorin Musuroi Ciprian Sorandaru Doru Vatau Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling Energies metal oxide varistor disk shape low voltage parallel connection thermal coupling |
| title | Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling |
| title_full | Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling |
| title_fullStr | Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling |
| title_full_unstemmed | Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling |
| title_short | Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling |
| title_sort | case study about the energy absorption capacity of metal oxide varistors with thermal coupling |
| topic | metal oxide varistor disk shape low voltage parallel connection thermal coupling |
| url | https://www.mdpi.com/1996-1073/12/3/536 |
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