500kV主变参数不对称下的稳态特性研究  

Study on Steady-state Character of 500 kV Main Transformer with Parameter Asymmetry

作　　者：邱桂华 吕睿博 陆锦培 汤志锐 夏成军[3] 杨琦[4] 

机构地区：[1]广东电网有限责任公司佛山供电局,广东佛山528000 [2]湖南工学院电气信息工程学院,湖南衡阳421002 [3]华南理工大学电力学院,广东广州510640 [4]中国电力科学研究院,北京100192

出　　处：《陕西电力》2015年第4期61-65,共5页Shanxi Electric Power

基　　金：国家863高技术基金项目资助(2011AA05A105)

摘　　要：结合某500 kV主变单相替换工程实例,基于PSCAD模型仿真分析了主变替换后因三相参数不对称对稳态特性的影响。主变压器(主变)从电压水平、负载率以及分接头3个方面对主变替换前后各侧不平衡量进行分析,结果表明主变因三相短路电压百分比不一致引起的高中压侧不平衡量在允许范围内,同时其对低压侧三相对地电压不平衡的影响也很小。说明变压器运行时,允许其三相短路电压百分比具有一定程度的不对称性,为进一步研究500 kV主变单相替换的适应性提供了基础。Combined with the practical project to replace single phase transformer in 500 kV substation,the impact on steady-state characteristic of transformer due to three-phase parameter asymmetry is studied based on the PSCAD simulation model. According to the analysis of unbalance values each side before and after the replacement of the transformer in three aspects of the voltage level, load rate and the tap, the unbalance values in high voltage side and middle voltage side caused by asymmetric three phase short- circuit voltage are in the permitted range, at the same time, the influence on the unbalance of three-phase voltage to ground caused by asymmetric three phase short-circuit voltage is very limited. The result shows the transformer can withstand a certain degree of asymmetry for three phase short-circuit voltage when in run, which provides foundation for further studies on the applicability of replacing single phase transformer for main transformer.

关 键 词：500KV主变 短路电压百分比 参数不对称 对地电压不平衡 稳态特性 

分 类 号：TM411.3[电气工程—电器]