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

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 536 ◽  
Author(s):  
Flaviu Frigura-Iliasa ◽  
Sorin Musuroi ◽  
Ciprian Sorandaru ◽  
Doru Vatau
Keyword(s):  
Thermal Stability ◽  
Metal Oxide ◽  
Thermal Activation ◽  
Absorption Capacity ◽  
Technical Solution ◽  
Thermal Coupling ◽  
Thermal Exchange ◽  
Surge Arresters ◽  
Thermal Stability Of

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.

Simulation Analysis of Critical Parameters for Thermal Stability of Surge Arresters

2021 ◽  
pp. 1-1
Author(s):  
Yvonne Spack-Leigsnering ◽  
M. Greta Ruppert ◽  
Erion Gjonaj ◽  
Herbert De Gersem ◽  
Volker Hinrichsen
Keyword(s):  
Thermal Stability ◽  
Simulation Analysis ◽  
Critical Parameters ◽  
Surge Arresters ◽  
Thermal Stability Of

Thermal Stability of Ammonia Borane: A Case Study for Exothermic Hydrogen Storage Materials

2010 ◽  
Vol 24 (4) ◽  
pp. 2596-2606 ◽  
Author(s):  
Scot D. Rassat ◽  
Christopher L. Aardahl ◽  
Tom Autrey ◽  
R. Scott Smith
Keyword(s):  
Thermal Stability ◽  
Hydrogen Storage ◽  
Ammonia Borane ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
Thermal Stability Of

Role of Metal Oxide Nanomaterials on Thermal Stability of 1,3,6-Trinitrocarbazole

2016 ◽  
Vol 41 (5) ◽  
pp. 912-918 ◽  
Author(s):  
Seied Mahdi Pourmortazavi ◽  
Mehdi Rahimi-Nasrabadi ◽  
Hossein Rai ◽  
Abbas Besharati-Seidani ◽  
Abdollah Javidan
Keyword(s):  
Thermal Stability ◽  
Metal Oxide ◽  
Metal Oxide Nanomaterials ◽  
Thermal Stability Of

ROLE OF MOLYBDENUM TRIOXIDE ON THERMAL STABILITY OF POLYANILINE NANOCOMPOSITE

2012 ◽  
Vol 11 (03) ◽  
pp. 1250025
Author(s):  
P. SUJA PREMA RAJINI ◽  
R. MURUGESAN ◽  
S. PERUMAL
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Particle Size ◽  
Metal Oxide ◽  
Molybdenum Trioxide ◽  
Spectral Studies ◽  
Average Particle ◽  
Weight Loss Step ◽  
The Third ◽  
Thermal Stability Of

Molybdenum trioxide (MoO3) grains were coated with conducting organic polymer of polyaniline. The as-prepared nanocomposite samples were characterized by Fourier transformed infrared (FTIR) spectra, X-ray diffraction (XRD) and Thermogravimetry (TGA). The XRD curves shows that, [Formula: see text] have high crystallinity due to the presence of large number of sharp peaks. From the XRD pattern the particle size is evaluated by using Debye-Scherrer's formula and the average particle size of [Formula: see text] and [Formula: see text] nanocomposites are found to be 46 and 32 nm, respectively. This is clearly observed that the condensed particle size of nanocomposite materials is due to the insertion of metal oxide of molybdenum. The incorporation of metal oxide of MoO3 in polyaniline (Pani) is confirmed by FTIR spectral studies. After de-doping, the characteristic peaks of Pani for all the Pani materials are almost same. This is due to the leaching of metal oxide of MoO3 from Pani. From these observations it is noted that doping–dedoping can also take place in inorganic metal oxides. The thermogram showed a three-step degradation process. The first weight loss step was due to the removal of physisorbed water molecules and moisture. The second minor weight loss step was associated with the removal of dopant from Pani backbone and the slight degradation of benzenoid structure of Pani and their thermal stability is enhanced. The third weight loss step was ascribed to the degradation of quinoid form of Pani. This confirmed the thermal stability of [Formula: see text] nanocomposite system. After degradation above 1000°C, the Pani with MoO3 showed a remaining weight of 8%. This confirmed that incorporation of metal oxide in the Pani nanocomposites is 8%. The enhancement of thermal stability is due to the intercalation of Pani chains into MoO3 in first two step degradation, which is further supported by FTIR and XRD reports. The third step degradation of Pani with MoO3 nanocomposite is loosely bound in organic and inorganic part. Therefore, the organic part is easily decomposed.

Surge Discharge Capability and Thermal Stability of a Metal Oxide Surge Arrester

1983 ◽  
Vol PAS-102 (2) ◽  
pp. 282-289 ◽  
Author(s):  
M. Kan ◽  
S. Nishiwaki ◽  
T. Sato ◽  
S. Kojima ◽  
S. Yanabu
Keyword(s):  
Thermal Stability ◽  
Metal Oxide ◽  
Thermal Stability Of

Thermal stability of polycrystalline silicon/metal oxide interfaces

2002 ◽  
Vol 81 (22) ◽  
pp. 4157-4158 ◽  
Author(s):  
A. Callegari ◽  
E. Gousev ◽  
T. Zabel ◽  
D. Lacey ◽  
M. Gribelyuk ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Metal Oxide ◽  
Polycrystalline Silicon ◽  
Oxide Interfaces ◽  
Thermal Stability Of
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