暂态冲击负荷下MOA热散逸特性及影响因素研究

MOA Heat Dissipation Characteristics and Influencing Factors Under Transient Impact Load

通过多起无间隙金属氧化物避雷器(以下简称MOA)事故的分析和研究,发现热崩溃在MOA损坏事故中占据很高比例。运行条件下,在MOA承受冲击负荷的过程中若发热高于散热则电阻片温度会累积升高,最终导致MOA热崩溃。MOA呈现的热散逸特性与暂态冲击负荷、MOA结构、元件材料、荷电率等因素有关,因此研究MOA的热散逸性及影响因素对MOA的设计和安全运行具有重要意义。本研究以典型35 kV复合外套MOA和瓷外套MOA为例,从暂态冲击负荷、MOA结构、荷电率以及表面污秽几个方面对MOA热散逸特性展开研究,获得了MOA热散逸特性及各因素对MOA热散逸特性的影响规律。

Through analysis and research on several 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 35 kV composite housing MOA and porcelain housing MOA as examples,the MOA heat dissipation characteristics are studied from the aspects of transient impact load,MOA structure,charge rate and surface contamination.The MOA heat dissipation characteristics and the influence of various factors on the thermal dissipation characteristics of MOA are obtained.