变压器谐波损耗计算及影响因素分析  

Transformer harmonic loss calculation and influence factor analysis

作　　者：张占龙[1] 王科[1,2] 李德文[1] 周军[3] 吴喜红[1] 黄嵩[1] 唐炬[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]重庆长寿供电局,重庆401220 [3]四川自贡电业局,四川自贡643000

出　　处：《电力系统保护与控制》2011年第4期68-72,78,共6页Power System Protection and Control

基　　金：国家重点基础研究计划(973)资助(2009CB724506);重庆大学输配电装备及系统安全与新技术国家重点实验室访问学者基金(2007DA10512709408);中国电机工程学会电力青年科技创新项目~~

摘　　要：为了准确分析配电网谐波对变压器损耗的影响,依据电路理论建立了变压器谐波损耗模型,推导出变压器谐波损耗的计算关系式。针对谐波次数和变压器负载不平衡引起的谐波损耗进行了分析,提出了变压器谐波损耗在线监测方法,并通过实验对该方法的有效性进行了分析。分析结果表明:建立的变压器谐波损耗模型一方面由于不需要考虑变压器一次侧谐波电流,简化了计算复杂程度;另一方面能够准确计算出变压器的各次谐波引起的变压器损耗。基于配电网3次与5次谐波引起的变压器损耗占变压器总谐波损耗的90%以上,有效降低配电网3次与5次谐波对于变压器的降损节能具有很好的工程实用价值。In order to analyze the influence of distribution network harmonic on transformer loss accurately,transformer harmonic loss model is established according to circuit theory and its calculation formula is derived.Transformer harmonic loss caused by harmonic order and transformer load imbalance is analyzed,a method about online monitoring transformer harmonic loss is proposed, and its effectiveness is analyzed by experiment.The result confirms that the calculation can be simplified by using transformer harmonic loss model because it does not need to consider the transformer primary side harmonic currents and transformer harmonics loss caused by each order harmonic can be calculated accurately.Effectively reducing third order and fifth order harmonic of distribution network has a good practical value for energy conservation of transformer because more than 90% of transformer harmonic loss is caused by them.

关 键 词：变压器 谐波 不平衡 简化模型 在线监测 

分 类 号：TM406[电气工程—电器]