摘要
电力变压器绝缘纸板的复弹性模量与纸板所处温度和老化程度等密切相关,对其进行研究有助于深入掌握电力变压器绕组动力学特性及基于振动信号的绕组机械状态检测技术。文中从材料的粘弹性理论出发,对绝缘纸板进行加速老化试验,使用动态热机械分析仪(DMA)研究了老化纸板在100 Hz应力作用下,在不同温度和老化程度的情况下,储能模量和机械损耗角的变化规律,建立了纸板复弹性模量与温度和老化程度的联系。结果表明,纸板的复弹性模量随着老化程度的增加和温度的升高而降低,机械损耗角的正切值则基本保持不变,其值小于0.055;复弹性模量受温度的影响系数α随老化程度的增加而减小。研究结果对于利用振动信号评估变压器老化及机械状态具有重要的指导意义。
The complex elastic modulus of pressboard in power degradation, the research on it can make great contribution to transformer is closely related to the temperature and get the dynamic characteristics of power transformer windings and the method to detect the winding mechanical condition based on vibration signal. Based on the viscoelastic theory of materials, this paper makes an accelerated aging experiment on pressboard, and then the characteristics of storage modulus and mechanical loss angle of degraded pressboard under different temperature are studied through dynamic mechanical analyzer. Besides that, the relationship between complex elastic modulus, temperature and degradation are analyzed combining with the test on degree of polymerization （DP） of pressboard. The results show that the complex elastic modulus of pressboard decreases with the increase of degradation and temperature, the tangent of mechanical loss angle is below 0.055 and remains unchanged under the influence of temperature and deg- radation. The influence coefficient of complex elastic modulus decreases with the increase of degradation degree. The results of this paper have great guiding significance for evaluating degradation and mechanical condition of power transformer based on vibration signals.
作者
李秀广
张凡
汲胜昌
吴旭涛
马波
王银明
张宁川
LI Xiuguang;ZHANG Fan;JI Shengchang;WU Xutao;MA Bo;WANG Yinming;ZHANG Ningchuan(State Key Laboratory of Electrical Insulation and Power Equipment, Xi＇an Jiaotong University, Xi＇an 710049, China;Ningxia Electric Power Research Institute of State Grid Ningxia Electric Co., Ltd., Yinchuan 750001, China;Ningxia Electric Power Energy Technology Co., Ltd., Yinchuan 750000, China)
出处
《高压电器》
CAS
CSCD
北大核心
2018年第7期211-216,共6页
High Voltage Apparatus
关键词
老化
温度
绝缘纸板
复弹性模量
动态热机械分析仪
degradation
temperature
insulation pressboard
complex elastic modulus
dynamic mechanical analyzer
