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By analysing and researching many gapless metal oxide surge arresters (MOA) accidents, it is found that thermal collapse accounts for a high proportion of MOA damage accidents. During operation, if the heat is higher than the heat dissipation during the MOA's impact load, the temperature of the resistor will increase and eventually cause the MOA to collapse. The thermal dissipation characteristics exhibited by MOA are related to transient impact load, MOA structure, component material, operating charge rate and other factors. Therefore, studying MOA heat dissipation and influencing factors is of great significance for the design and safe operation of MOA. Taking the typical 35kV composite housing MOA and porcelain housing MOA as examples, the thermal dissipation characteristics of MOA are studied from the aspects of transient impact load, MOA structure, charge rate and surface contamination. The control variable method is used to conclude that the heat dissipation characteristics of the porcelain housing MOA are better. In addition, the lower the charge rate of the arrester and the lower the surface contamination, the better the heat dissipation characteristics of the MOA. When studying the influence of transient load, the heat absorbed by MOA under square wave is higher than that of lightning current and large current, and the heat dissipation characteristic is the worst.
Inspec keywords: surface contamination; arresters; resistors; cooling
Subjects: Protection apparatus