基于等温松弛电流的变压器测温用荧光光纤护套的老化状态评估
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摘要
基于等温松弛电流方法,使用沿面电极布置的形式,对光纤护套材料的油中热老化状态进行分析评估,并通过机械拉伸实验和傅里叶红外光谱对试样力学性能和化学结构进行辅助分析。结果表明:光纤护套在变压器油中热老化后力学性能劣化,拉伸强度和断裂伸长率在老化前期迅速下降,后期降速减缓;傅里叶红外光谱结果表明光纤护套在变压器油中热老化后没有明显的醛类产物生成,亚甲基、甲基等振动峰强度有一定程度的减弱,可能有分解过程发生;等温松弛电流结果表明随着老化时间及温度的增加,老化因子A的值逐渐增加,说明等温松弛电流法能够反映光纤护套在变压器油中的热老化程度,可以作为老化评估的有效手段。
The thermal ageing condition of sheath material for fluorescent optical fiber in transformer oil was estimated based on isothermal relaxation current method, and the electrodes were set along the sample surface. The mechanical properties and chemical structure of the sample was analyzed via tensile test and Fourier transform infrared spectra(FTIR). The results show that the mechanical properties of the sample degrade after ageing in transformer oil, the tensile strength and elongation at break decrease rapidly at earlier ageing stage and then the degradation slows down. According to FITR results, there is no obvious aldehyde group generates after ageing; the strength of methylene and methyl vibration peaks decreases, indicates that some decomposition process may occur. The isothermal relaxation current results demonstrate that the ageing factor(A) increases with the increase of ageing time and temperature. It is proved that the isothermal relaxation current method can be used to estimate the ageing condition of sheath material for fluorescent optical fiber in transformer oil.
The thermal ageing condition of sheath material for fluorescent optical fiber in transformer oil was estimated based on isothermal relaxation current method, and the electrodes were set along the sample surface. The mechanical properties and chemical structure of the sample was analyzed via tensile test and Fourier transform infrared spectra(FTIR). The results show that the mechanical properties of the sample degrade after ageing in transformer oil, the tensile strength and elongation at break decrease rapidly at earlier ageing stage and then the degradation slows down. According to FITR results, there is no obvious aldehyde group generates after ageing; the strength of methylene and methyl vibration peaks decreases, indicates that some decomposition process may occur. The isothermal relaxation current results demonstrate that the ageing factor(A) increases with the increase of ageing time and temperature. It is proved that the isothermal relaxation current method can be used to estimate the ageing condition of sheath material for fluorescent optical fiber in transformer oil.
引文
[1]李凯.变压器绕组光纤温度在线监测系统应用研究[D].北京:华北电力大学,2014.
[2]操敦奎.变压器油中气体分析诊断与故障检查[M].北京:中国电力出版社,2005.
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[5]GB/T 11026.2—2012,电气绝缘材料耐热性第2部分:试验判断标准的选择[S].
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[7]朱永华,高小庆,杨娟娟,等.等温松弛电流法在高压交联聚乙烯绝缘交流电缆状态评估中的应用[J].高电压技术,2016,42(2):513-521.
[8]王雅群,尹毅,李旭光,等.等温松弛电流用于10k V XLPE电缆寿命评估的方法[J].电工技术学报,2009,24(9):33-37.
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[10]李淑琦,朱永华,罗兵,等.型式试验对挤塑绝缘高压直流电缆老化状态的影响研究[J].绝缘材料,2015,48(7):73-78.
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[12]SIMMONS J G,TAM M C.Theory of isothermal current and the direct determination of trap parameters in semiconductors and insulators containing arbitrary trap distributions[J].Physical Review B,1973,7(8):3706-3713.
[13]赵文彬,张冠军,严璋.复合材料的陷阱参数对其在真空中高压脉冲下沿面闪络特性的影响[J].中国电机工程学报,2007,27(9):11-17.
[14]BEIGERT M,KRANZ H G.Destruction free ageing diagnosis of power cable insulation using the isothermal relaxation current analysis[C]//Conference Record of the 1994IEEE International Symposium on Electrical Insulation.Pittsburgh,Pittsburgh,USA:IEEE,1994:17-21.
[15]OYEGOKE B S,FOOTTIT F,BIRTWHISTLE D,et al.Condition assessment of XLPE insulated cables using isothermal relaxation current technique[C]//IEEE Power Engineering Society General Meeting.Montreal,Canada:IEEE,2006:18-22.
[2]操敦奎.变压器油中气体分析诊断与故障检查[M].北京:中国电力出版社,2005.
[3]廖延彪.我国光纤传感技术现状和展望[J].光电子技术与信息,2003,16(5):1-6.
[4]高云鹏,谭甜源,刘开培.电力电缆温度监测方法的探讨[J].绝缘材料,2014,47(6):13-17,22.
[5]GB/T 11026.2—2012,电气绝缘材料耐热性第2部分:试验判断标准的选择[S].
[6]曹雨,吴建东,刘松,等.单因子老化中定子线棒等温松弛电流的研究[J].电工技术学报,2015,30(1):242-248.
[7]朱永华,高小庆,杨娟娟,等.等温松弛电流法在高压交联聚乙烯绝缘交流电缆状态评估中的应用[J].高电压技术,2016,42(2):513-521.
[8]王雅群,尹毅,李旭光,等.等温松弛电流用于10k V XLPE电缆寿命评估的方法[J].电工技术学报,2009,24(9):33-37.
[9]曾恕程.基于松弛电流时频特性分析的变压器绝缘状态评估方法研究[D].上海:上海交通大学,2015.
[10]李淑琦,朱永华,罗兵,等.型式试验对挤塑绝缘高压直流电缆老化状态的影响研究[J].绝缘材料,2015,48(7):73-78.
[11]霍瑞美.交联聚乙烯热老化监测及快速热寿命评估[D].上海:上海交通大学,2014.
[12]SIMMONS J G,TAM M C.Theory of isothermal current and the direct determination of trap parameters in semiconductors and insulators containing arbitrary trap distributions[J].Physical Review B,1973,7(8):3706-3713.
[13]赵文彬,张冠军,严璋.复合材料的陷阱参数对其在真空中高压脉冲下沿面闪络特性的影响[J].中国电机工程学报,2007,27(9):11-17.
[14]BEIGERT M,KRANZ H G.Destruction free ageing diagnosis of power cable insulation using the isothermal relaxation current analysis[C]//Conference Record of the 1994IEEE International Symposium on Electrical Insulation.Pittsburgh,Pittsburgh,USA:IEEE,1994:17-21.
[15]OYEGOKE B S,FOOTTIT F,BIRTWHISTLE D,et al.Condition assessment of XLPE insulated cables using isothermal relaxation current technique[C]//IEEE Power Engineering Society General Meeting.Montreal,Canada:IEEE,2006:18-22.