测试引线状态对变压器扫频阻抗特性的影响研究  

Survey of the impact of test lead status on sweep frequency impedance characteristics of transformer

作　　者：侯峰 刘勇 张耘溢[4] 冯洋 尹松 HOU Feng;LIU Yong;ZHANG Yunyi;FENG Yang;YIN Song(Training Center of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan Ningxia 750011,China;School of Electronic and Information,Zhongyuan University of Technology,Zhengzhou Henan 450007,China;State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University,Xi’an Shaanxi 710049,China;Maintenance Company of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan Ningxia 750011,China)

机构地区：[1]国网宁夏电力有限公司培训中心,宁夏银川750011 [2]中原工学院电子信息学院,河南郑州450007 [3]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [4]国网宁夏电力有限公司检修公司,宁夏银川750011

出　　处：《宁夏电力》2021年第6期48-53,共6页Ningxia Electric Power

基　　金：国网宁夏电力有限公司科技项目资助(项目编号:5229JP210001)。

摘　　要：扫频阻抗法是一种检测变压器绕组机械状态的新型测试方法,本文利用1台10 k V单相变压器,研究了测试引线状态对扫频阻抗曲线及其诊断参量(相对互差绝对值及相关系数)的影响。结果表明:(1)测试引线状态主要影响600 k Hz及以上频率的扫频阻抗曲线,具体表现为扫频阻抗在600~850 k Hz处的幅值升高,以及850 k Hz~1 MHz处的幅值降低;(2)随着测试引线状态的改变,扫频阻抗在低、中、高频段的相关系数皆会出现减小,而其相对互差绝对值则基本不变。为了准确检测现场变压器的绕组状态,扫频阻抗测试应保持系统引线状态不变,或主要利用相对互差绝对值对变压器绕组状态进行诊断。Sweep frequency impedance is a new method for testing the mechanical status of transformer windings.Based on a single-phase transformer,the impact of test lead status on sweep frequency impedance curve and the diagnosis parameters is studied.The results show that the test lead status mostly influences 600 k Hz-and-above sweep frequency curves.To be specific,the sweep frequency impedance increases in range of 600~850 k Hz,and decreases in range of 850 kHz~1 MHz;with the change of the test lead status,the correlation coefficients in low,medium and high-frequency bands reduce,while relative difference absolute value keeps unchanged.To sum up,the lead status should be unchanged or relative difference absolute value should be adopted in sweep frequency impedance test to accurately detect the winding status of on-site transformers.

关 键 词：扫频阻抗法 变压器绕组变形 测试引线影响 相对互差绝对值 相关系数 

分 类 号：TM406[电气工程—电器]