高压电力电容器内部最热点温度的计算模型  

Calculation model of HV power capacitor internal hottest-spot temperature

作　　者：刘文泽[1] 蔡泽祥[1] 黄松波[2] 金向朝[2] 单蒙 

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]广东电网公司佛山供电局,广东佛山528000 [3]广东天联咨询设计有限公司,广东广州510610

出　　处：《电力自动化设备》2009年第7期82-84,共3页Electric Power Automation Equipment

摘　　要：为了估计电力电容器内部运行最高温度,主要考虑了电力电容器的内部介质损耗造成电容器发热、运行环境温度和电容器外壳的散热性能,提出了以电力电容器在动态热平衡时的外壳最热温度作为中间变量,建立了电力电容器内部最热点温度的计算模型,通过一类大量用于电力系统无功功率补偿的电力电容器参数为计算依据,计算了电力电容器在不同运行容量、不同环境温度下的内部最热点温度。利用红外热像仪测量了并联电力电容器组长时间运行的环境温度和电容器外壳最热温度,测量结果验证了温度估计模型的有效性。最后,对加强电容器的安全运行提出了运行环境温度的建议。To estimate the internal hottest-spot temperature of power capacitor in operation,three aspects are mainly taken into account：the dielectric loss, ambient temperature and its radiating performance. The model for calculating the internal hottest- spot temperature of capacitor is proposed,which takes the hottest temperature of power capacitor shell at heat exchange balance as the intermediate variable. With the parameters of power capacitor widely used in power system for reactive power compensation,the internal hottest- spot temperature is calculated for different operating powers and ambient temperatures. The field temperatures are measured with a thermal infrared imager,including the ambient temperature and the hottest temperature of a power capacitor shell. Measurement result verifies the validity of the temperature calculation model. The operating ambient temperature is proposed for the safe operation of shunt power capacitor.

关 键 词：电力电容器 介质损耗 最热点温度 热平衡 计算模型 

分 类 号：TM533[电气工程—电器] TM934