MANUFACTURING OF HIGH ENERGY ABSORPTION LOW VOLTAGE METAL OXIDE VARISTORS

Metal Oxide Varistors are applied in overvoltage protection equipment, at any voltage, being one of the most common power electronic devices in use. They have a high nonlinear dependence between voltage and current, and a relatively high heat adsorption capacity in case of normal overvoltage shocks....

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Bibliographic Details
Published inInternational Multidisciplinary Scientific GeoConference : SGEM Vol. 3; pp. 61 - 68
Main Authors Filip, Bogdan, Vatau, Doru, Frigura-Iliasa, Flaviu Mihai, Frigura-Iliasa, Mihaela, Balcu, Florin
Format Conference Proceeding
LanguageEnglish
Published Sofia Surveying Geology & Mining Ecology Management (SGEM) 01.01.2016
Subjects
Ageing
Aging
Capacity
Cylinders
Electronic devices
Electronic equipment
Energy absorption
Finite element method
Heat
Heat exchangers
Heat pumps
Heat treatment
Low voltage
Metal oxides
Metals
Overheating
Overvoltage
Radiators
Solutions
Temperature
Temperature effects
Varistors
Voltage
France
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Summary:Metal Oxide Varistors are applied in overvoltage protection equipment, at any voltage, being one of the most common power electronic devices in use. They have a high nonlinear dependence between voltage and current, and a relatively high heat adsorption capacity in case of normal overvoltage shocks. Their current is mostly activated by temperature, so overheating can cause a major damage. Researches could be carried out both for a new material as well as for technical solutions for a new design of this piece of equipment, by studying heat extraction and transfer inside a new varistor device. This paper propose a simple new device, used for low voltage applications, based on some supplementary brass masses added to the varistor, shaped as cylinders. They act like heat pumps at the beginning and as radiators at the end of the thermal process caused by a transitory overvoltage. A finite element model followed by some experimental measurements is also presented in order to confirm the new design, for permanent and transitory regimes. Including additional brass masses inside a new varistor structure could easily add heat pumping and dissipation in order to reduce temperature stress and aging effect.
ISSN:1314-2704