变压器绕组变形综合分析判断与论证  

Comprehensive Analysis,Judgment and Demonstration of Transformer Winding Deformation

作　　者：史玉清 杨红伟 矣宗林 杨凯越 陈云浩 Shi Yuqing;Yang Hongwei;Yi Zonglin;Yang Kaiyue;Chen Yunhao(Yuxi Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Yuxi 653100,China;Pu'er Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Pu'er 665000,China;Chuxiong Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Pu'er 675000,China)

机构地区：[1]云南电网有限责任公司玉溪供电局,云南玉溪653100 [2]云南电网有限责任公司普洱供电局,云南普洱665000 [3]云南电网有限责任公司楚雄供电局,云南楚雄675000

出　　处：《云南电力技术》2022年第2期79-83,共5页Yunnan Electric Power

摘　　要：当变压器承受外界短路冲击跳闸时,主要采用的绕组变形判定方法是低电压短路阻抗法;因试验条件、环境等因素的影响,短路阻抗法的试验结果关联性分析不强,需要采用其他试验方法进行验证。本文对绕组电容量和短路阻抗之间的变化关系进行定性分析,发现了变压器低压、中压绕组发生变形时,电容量和阻抗电压百分数会相应变化。依据220 kV变压器抗短路不足典型案例进行阻抗试验、电容量试验和解体分析,提出变压器绕组变形综合判定方法。When the transformer trips under the impact of external short-circuit,the main method to judge the winding deformation is the low-voltage short-circuit impedance method;Due to the influence of test conditions,environment and other factors,the correlation analysis of test results of short-circuit impedance method is not strong,and other test methods need to be used for verification.In this paper,the relationship between winding capacitance and short-circuit impedance is qualitatively analyzed.It is found that when the low-voltage and medium-voltage windings of transformer are deformed,the capacitance and impedance voltage percentage will change accordingly.Based on the typical case of insufficient short-circuit resistance of 220 kV transformer,the impedance test,capacitance test and disassembly analysis are carried out,and the comprehensive judgment method of transformer winding deformation is put forward.

关 键 词：短路冲击 频率效应法 短路阻抗法 电容量 定性分析 

分 类 号：TM74[电气工程—电力系统及自动化]