摘要
为了研究电流畸变情况下油浸式配电变压器负载损耗和绕组热点温度的变化规律,基于IEEE StdC57.110中的绕组涡流谐波损耗因子和杂散谐波损耗因子,并考虑绕组在谐波电流下的集肤效应会增强,定义了绕组电阻谐波损耗因子,从而建立了变压器在谐波电流下负载损耗计算模型。考虑到绕组涡流损耗密度分布不均对绕组热点温度的影响,利用文中所建立的变压器在谐波电流下负载损耗计算模型修正了IEEE Std C57.110:2008的绕组热点温度计算公式。分析结果表明,谐波电流会引起较大的额外负载损耗,谐波畸变率为40%和60%时负载损耗分别增加了近0.5倍和1倍,此时顶层油温和热点温度也有较大增加,顶层油温升和热点温升在畸变率为40%时分别达到了71.6、102.7 K,远超过温升限值。同时发现谐波频率越高,负载损耗和热点温升增加越快。
To investigate the variation of load loss and winding hot spot temperature of the oil immersed transformer in the case of current distortion, according to the winding eddy current harmonic loss factor and stray harmonic loss factor of IEEE Std C57.110, the harmonic loss factor of winding resistance is defined with consideration of the enhanced skin effect of winding under harmonic current, and a load loss calculation model of the transformer under harmonic current is established. Considering the influence of the eddy current loss density distribution on the winding hot spot temperature, the calculation formula of the winding hot spot temperature in IEEE Std C57.110：2008 is modified by using the proposed load loss calculation model. Analysis results show that： the harmonic current can cause large additional load loss; the load loss is increased by nearly 0.5 times and 1 time when the harmonic distortion rate is 40% and 60%, respectively, and the top oil temperature and the hot spot temperature are also increased significantly; the top oil temperature rise and the hot spot temperature rise reach 71.6 K and 102.7 K at the distortion rate of 40%, much higher than the limiting value of temperature rise. In addition, the higher the harmonic frequency, the faster the increases in the load loss and the hot spot temperature rise.
作者
周卫华
万代
江红成
叶会生
齐飞
周恒逸
赵莉华
冯政松
ZHOU Weihua;WAN Dai;JIANG Hongcheng;YE Huisheng;QI Fei;ZHOU Hengyi;ZHAO Lihua;FENG Zhengsong(State Grid Hunan Electric Power Research Institute,Changsha 410007,China;State Grid Nantong Power Supply Company,Jiangshu Nantong 226000,China;School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China)
出处
《高压电器》
CAS
CSCD
北大核心
2018年第9期135-141,共7页
High Voltage Apparatus
