摘要
为提高干式空心电抗器温度场计算精度,基于多场耦合有限元理论,考虑包封撑条和防雨帽的影响,建立了外电路约束下的干式空心并联电抗器电磁–流体–温度多场耦合数值计算模型。通过电磁场计算得到包封的损耗,并将其作为三维流体–温度场的热源计算电抗器的温度场和流场分布。由于导体电导率与温度相关,在电磁–流体–温度场中迭代计算了包封损耗。将考虑包封撑条和防雨帽的温升计算值和未考虑包封撑条和防雨帽的温升计算值分别与红外测温对比分析,结果表明:考虑包封和防雨帽的模型计算更加精确,温升最大误差<3%,而未考虑包封和防雨帽影响的误差高达9%。通过分析电抗器包封轴向及顶部径向温度分布规律,为干式空心并联电抗器的设计、运维和温升在线监测提供理论依据。
Temperature field distribution of dry-type air-core shunt reactor is of much importance for the equipment safety and reliable operation. In order to improve the calculation precision of the temperature field of dry-type air-core reactor, based on the multi-field coupling finite element theory, an electromagnetic-fluid-temperature multi-field coupling numerical calculation model of dry-type air-core shunt reactor is established. The model is under the constraint of external circuit and the spacers between encapsulations are considered as well as the rainhat on the reactor. The loss of encapsulation calculated in electromagnetic field is imported into fluid-temperature field calculation as a heat source. Because the conductivity of the conductor is related to temperature, the encapsulation loss is iteratively calculated in the electromagnetic-fluid-temperature field. In this method, temperature distribution of dry-type air-core reactor is obtained. Compared with the infrared measuring temperature rise, the temperature rise error of the model without spacers nor rainhat is as high as 9%, however the accuracy of the calculation model considering spacers and rainhat is much better, with temperature rise error less than 3%. The temperature distribution analysis of the reactor encapsulation in the axial and radial on the top can provide a theoretical basis for dry-type air-core shunt reactor in product design and temperature rising online monitoring.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第9期3021-3028,共8页
High Voltage Engineering
关键词
干式空心并联电抗器
多物理场耦合
流体场
温度场
红外测温
dry-type air-core shunt reactor
multi-field coupling
fluid field
temperature field
infrared temperature measurement
