电力变压器振动产生机理及影响因素研究  

Vibration Mechanism and Influence Factors in Power Transformers

作　　者：朱叶叶 汲胜昌[1] 张凡[1] 刘勇[1] 董鸿魁[2] 崔志刚[2] 吴佳玮[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]云南电网公司技术分公司,昆明650000

出　　处：《西安交通大学学报》2015年第6期115-125,共11页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51377130)

摘　　要：为了研究变压器振动的产生机理,针对饼式绕组结构的油浸式电力变压器,利用铁心和绕组的数学模型,分析了振动产生机理、合成过程以及不同运行工况对振动特性的影响。搭建了基于压电式振动加速度传感器的振动测试平台,针对变压器进行了空载、负载、功率因数、三项不对称度以及油温等变压器运行工况因素对于变压器振动特性影响规律的试验。结果表明：变压器最大分接时的基频振动分量大于额定分接时的基频振动分量;铁心以及绕组产生的振动信号在传递过程中并非线性叠加,箱体振动中基频分量随功率因数增加而增大;三相不对称运行状态下的变压器振动信号中存在50、150以及250Hz分量;变压器箱体振动随油温上升呈线性增长趋势,且温度系数在0.005~0.035的范围内与变压器容量无关。研究结果为基于振动信号分析的变压器监测技术的进一步发展提供了参考。For an oil-immersed transformer core and pancake windings,the transformer vibration parameters are sought out and the vibration superposition is analyzed.The vibration monitoring system with piezoelectric vibration acceleration sensors is constructed and a series of experiments for the influence factors of the transformer vibration,such as current,power factor,unbalance factor and oil temperature,are conducted to investigate the vibration characteristics under different working conditions.It is found that the fundamental component of transformer tank under the greatest tapping is higher than that under principal tapping,transformer tank does not vibrate at linear superposition frequencies of core and windings;the fundamental component of transformer tank grows with the power factor;frequency components of 50 Hz,150 Hz and250 Hz appear in the vibration signals of power transformer due to the asymmetry.The experiments show that the fundamental component of the transformer vibration signal increases linearly with the oil temperature;temperature coefficient stays within 0.005-0.035 and does not depend upon the transformer capacity.

关 键 词：油浸式变压器 饼式绕组 振动 功率因数 不平衡度 温升 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]