摘要
为了研究纳米Al_(2)O_(3)对环氧树脂直流电树枝的影响,制备了环氧树脂及环氧树脂/Al_(2)O_(3)纳米复合材料,采用针-板电极对试样进行电树枝试验及局部放电检测,分析了直流电树枝的起树、生长及老化对应的局部放电情况。结果表明:添加纳米Al_(2)O_(3)颗粒能够降低环氧树脂中直流电树枝的起树概率和生长速度,当Al_(2)O_(3)的质量分数小于3.0%时,其含量越高,抑制电树枝的能力越强。此外,电压上升速度越快,环氧树脂直流电树枝的引发概率越高。试样中的电树在加压时间约为1 800 s时会出现滞长现象,且电树枝均为枝状电树。局部放电是环氧树脂直流电树枝老化的一个重要原因,局部放电脉冲簇主要出现在每个周期电压上升和下降的阶段,推测原因是在这两个阶段电树枝快速生长。通过对比纯环氧树脂和Al_(2)O_(3)质量分数为1.0%的环氧复合材料试样的局部放电测试结果,发现纳米Al_(2)O_(3)能够抑制电树枝发展过程中的局部放电,导致放电脉冲幅值降低并且出现更多局部放电稀疏的区域,说明纳米颗粒可以通过抑制局部放电来抑制电树枝的发展。
In order to study the effect of nano Al_(2)O_(3) on the DC electrical tree of epoxy resin,epoxy and epoxy/Al_(2)O_(3) nanocomposites were prepared.The samples were conducted electrical tree test and partial discharge detection by using needle-plane electrode,and the inception,growth,and ageing of DC electrical tree and corresponding partial discharge characteristics were analyzed.The results show that the addition of nano-Al_(2)O_(3) particles can decrease the initiation probability and growth rate of DC electrical tree in epoxy resin.When the mass fraction of Al_(2)O_(3) is less than 3%,the higher the content of Al2O3,the stronger the ability to suppress the electrical tree.In addition,the faster the voltage rise rate,the higher the initiation probability of DC tree in epoxy resin.When the voltage applying time is about 1800 s,the DC electrical tree stops growing,and the electrical trees are all branch trees.Partial discharge is an important reason for DC electrical tree ageing of epoxy resin,and the partial discharge pulse clusters appear in the voltage rise and fall phases in each cycle mainly,which is due to that the electrical trees grow faster at these two phases.By comparing the partial discharge test results of pure epoxy resin and the nanocomposites with 1% Al_(2)O_(3),it is found that nano-Al_(2)O_(3) can suppress the partial discharge in the electrical tree developing process,which leads to the decrease of discharge pulse amplitude and appearing of more sparse partial discharge areas,indicating that the nano particles can suppress the development of electrical tree by suppressing partial discharge.
作者
杨敏
王新
童小忠
江铁
戴超
陈向荣
金泱
YANG Min;WANG Xin;TONG Xiaozhong;JIANG Tie;DAI Chao;CHEN Xiangrong;JIN Yang(Zhejiang Key Laboratory of High-efficiency Energy-saving and Pollutant Control Technology for Thermal Power Generation,Zhejiang Energy Group Research Institute Co.,Ltd.,Hangzhou 311121,China;Zhejiang Provincial Key Laboratory of Electrical Machine Systems,College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《绝缘材料》
CAS
北大核心
2021年第6期49-55,共7页
Insulating Materials
基金
浙江省火力发电高效节能与污染物控制技术研究重点实验室开放基金项目(JSYJY-JS-2019-026)。
