变压器用测温光纤的电场及影响因素
|
摘要
针对变压器用测温光纤在电场作用下可能发生老化或绝缘破坏,进而影响电网安全运行的问题,提出了仿真研究方法。以典型的变压器用测温光纤安装为例,通过有限元方法计算光纤及护套材料在交流稳态情况下承受的电场。通过比较不同光纤纤芯半径、光纤护套厚度、光纤护套介电常数情况下的电场分布,研究影响光纤电场分布的因素。结果表明,垫块内光纤护套内径上下部分存在电场集中,可能发生电老化或绝缘破坏。通过改变光纤纤芯半径、护套厚度、护套介电常数,可以改变光纤内电场的分布。为减小电场局部集中,增大护套介电常数是最为有效的手段。
Simulation research is conducted to solve the power grid security problem caused by optical fiber temperature sensors degradation and breakdown in transformers under electric field. In a typical case,by finite element method,electric field distribution in fibers and bundle jackets under AC steady state was calculated. By comparing electric field distribution under different fiber core radius,jacket thickness and jacket permittivity,the influential factors on such distribution was analyzed. The results show that electric field concentration happens near the inner diameter of the jackets in the insulating filling strips between turns. When changing fiber core radius,jacket thickness or jacket permittivity,electric field distribution changes. To reduce such field,one of the most effective ways is to increase the permittivity of the jackets.
Simulation research is conducted to solve the power grid security problem caused by optical fiber temperature sensors degradation and breakdown in transformers under electric field. In a typical case,by finite element method,electric field distribution in fibers and bundle jackets under AC steady state was calculated. By comparing electric field distribution under different fiber core radius,jacket thickness and jacket permittivity,the influential factors on such distribution was analyzed. The results show that electric field concentration happens near the inner diameter of the jackets in the insulating filling strips between turns. When changing fiber core radius,jacket thickness or jacket permittivity,electric field distribution changes. To reduce such field,one of the most effective ways is to increase the permittivity of the jackets.
引文
[1]廖瑞金,杨丽君,郑含博,等.电力变压器油纸绝缘热老化研究综述[J].电工技术学报,2012,27(5):1.LIAO Ruijin,YANG Lijun,ZHENG Hanbo,et al. Reviews onoil-paper insulation thermal aging in power transformers[J].Transactions of China Electrotechnical Society,2012,27(5):1.
[2]黄晓峰,周利军,吴广宁.变压器热点温度计算经典模型的对比分析及改进[J].现代电力,2013,(2):69.HUANG Xiaofeng,ZHOU Lijun,WU Guangning. Comparative a-nalysis on classical thermal models for calculating transformer hot-spot temperature and its improvement[J]. Modem Electric Power,2013,(2):69.
[3]周翠娟,姜胜宝,尹晶,等.热老化过程中变压器油酸值变化研究[J].绝缘材料,2015,48(12):46.ZHOU Cuijuan,JIANG Shengbao,YIN Jing,et al. Study on acidvalue changes of transformer oil during thermal ageing[J]. Insula-ting Materials,2015,48(12):46.
[4]陈名铭,韦国,刘君,等.温度和水分对变压器油纸绝缘系统频域介电谱特性的影响[J].绝缘材料,2012,45(1):57.CHEN Mingming,WEI Guo,LIU Jun,et al. Effects of tempera-ture and moisture on the characteristics of frequency domain die-lectric spectroscopy of transformer oil-paper insulation system[J].Insulating Materials,2012,45(1):57.
[5]徐征宇,程涣超,遇心如,等.不同吸油率油浸纸板介电特性及电导特性研究[J].电机与控制学报,2015,19(12):82.XU Zhengyu,CHENG Huanchao,YU Xinru,et al. Dielectricand conducive properties of oil-impregnated pressboard under dif-ferent oil absorption[J]. Electric Machines and Control,2015,19(12):82.
[6]叶信红,韩宝忠,黄庆强,等.交联聚乙烯绝缘高压直流电缆电场分布计算[J].电机与控制学报,2014,18(5):19.YE Xinhong,HAN Baozhong,HUANG Qingqiang,et al. Simula-tion of electrical field distribution of XLPE insulated HVDC cable[J]. Electric Machines and Control,2014,18(5):19.
[7]王永红,魏新劳,朱宝森,等.极性反转电压下变压器油的击穿特性[J].电机与控制学报,2011,15(3):46.WANG Yonghong,WEI Xinlao,ZHU Baosen,et al. Breakdowncharacteristics of transformer oil at DC polarity reversal voltage[J]. Electric Machines and Control,2011,15(3):46.
[8]陈庆国,林林,高源,等.换流变压器中典型平板油纸绝缘结构的油流带电特性[J].电机与控制学报,2015,19(2):14.CHEN Qingguo,LIN Lin,GAO Yuan,et al. Flow electrificationcharacteristics of typical plane oil-pressboard insulation in convert-er transformer[J]. Electric Machines and Control,2015,19(2):14.
[9]李江华,朱焕杰.电力变压器常见故障及在线检测技术[J].绝缘材料,2008,41(5):71.LI Jianghua,ZHU Huanjie. Common defects and faults of powertransformers and its on-line detection technique[J]. InsulatingMaterials,2008,41(5):71.
[10]陈军.光纤测温技术在变压器上的应用[J].变压器,2008,45(1):38.CHEN Jun. Application of optical fiber temperature measurementtechnology to transformer[J]. Transformer,2008,45(1):38.
[11] LOBO Ribeiro A B,EIRA N F,SOUSA J M,et al. Multipointfiber-optic hot-spot sensing network integrated into high powertransformer for continuous monitoring[J]. IEEE Sensors Journal,2008,8(7):1264.
[12] BETTA G,PIETROSANTO A,SCAGLIONE A. An enhanced fi-ber-optic temperature sensor system for power transformer monito-ring[J]. IEEE Transactions on Instrumentation and Measure-ment,2001,50(5):1138.
[13]王朋国,钟力生,马素德,等.聚合物光纤老化特性的研究[J].绝缘材料,2006,39(1):19.WANG Pengguo,ZHONG Lisheng,MA Sude,et al. Study onaging characteristis of polymer optical fibers[J]. Insulating Mate-rials,2006,39(1):19.
[14]王旗,阴春晓,林嘉扬,等.换流站阀厅光纤局部放电原因分析[J].绝缘材料,2015,48(10):55.WANG Qi,YIN Chunxiao,LIN Jiayang,et al. Analysis on opti-cal fiber partial discharge of valve hall in converter station[J].Insulating Materials,2015,48(10):55.
[2]黄晓峰,周利军,吴广宁.变压器热点温度计算经典模型的对比分析及改进[J].现代电力,2013,(2):69.HUANG Xiaofeng,ZHOU Lijun,WU Guangning. Comparative a-nalysis on classical thermal models for calculating transformer hot-spot temperature and its improvement[J]. Modem Electric Power,2013,(2):69.
[3]周翠娟,姜胜宝,尹晶,等.热老化过程中变压器油酸值变化研究[J].绝缘材料,2015,48(12):46.ZHOU Cuijuan,JIANG Shengbao,YIN Jing,et al. Study on acidvalue changes of transformer oil during thermal ageing[J]. Insula-ting Materials,2015,48(12):46.
[4]陈名铭,韦国,刘君,等.温度和水分对变压器油纸绝缘系统频域介电谱特性的影响[J].绝缘材料,2012,45(1):57.CHEN Mingming,WEI Guo,LIU Jun,et al. Effects of tempera-ture and moisture on the characteristics of frequency domain die-lectric spectroscopy of transformer oil-paper insulation system[J].Insulating Materials,2012,45(1):57.
[5]徐征宇,程涣超,遇心如,等.不同吸油率油浸纸板介电特性及电导特性研究[J].电机与控制学报,2015,19(12):82.XU Zhengyu,CHENG Huanchao,YU Xinru,et al. Dielectricand conducive properties of oil-impregnated pressboard under dif-ferent oil absorption[J]. Electric Machines and Control,2015,19(12):82.
[6]叶信红,韩宝忠,黄庆强,等.交联聚乙烯绝缘高压直流电缆电场分布计算[J].电机与控制学报,2014,18(5):19.YE Xinhong,HAN Baozhong,HUANG Qingqiang,et al. Simula-tion of electrical field distribution of XLPE insulated HVDC cable[J]. Electric Machines and Control,2014,18(5):19.
[7]王永红,魏新劳,朱宝森,等.极性反转电压下变压器油的击穿特性[J].电机与控制学报,2011,15(3):46.WANG Yonghong,WEI Xinlao,ZHU Baosen,et al. Breakdowncharacteristics of transformer oil at DC polarity reversal voltage[J]. Electric Machines and Control,2011,15(3):46.
[8]陈庆国,林林,高源,等.换流变压器中典型平板油纸绝缘结构的油流带电特性[J].电机与控制学报,2015,19(2):14.CHEN Qingguo,LIN Lin,GAO Yuan,et al. Flow electrificationcharacteristics of typical plane oil-pressboard insulation in convert-er transformer[J]. Electric Machines and Control,2015,19(2):14.
[9]李江华,朱焕杰.电力变压器常见故障及在线检测技术[J].绝缘材料,2008,41(5):71.LI Jianghua,ZHU Huanjie. Common defects and faults of powertransformers and its on-line detection technique[J]. InsulatingMaterials,2008,41(5):71.
[10]陈军.光纤测温技术在变压器上的应用[J].变压器,2008,45(1):38.CHEN Jun. Application of optical fiber temperature measurementtechnology to transformer[J]. Transformer,2008,45(1):38.
[11] LOBO Ribeiro A B,EIRA N F,SOUSA J M,et al. Multipointfiber-optic hot-spot sensing network integrated into high powertransformer for continuous monitoring[J]. IEEE Sensors Journal,2008,8(7):1264.
[12] BETTA G,PIETROSANTO A,SCAGLIONE A. An enhanced fi-ber-optic temperature sensor system for power transformer monito-ring[J]. IEEE Transactions on Instrumentation and Measure-ment,2001,50(5):1138.
[13]王朋国,钟力生,马素德,等.聚合物光纤老化特性的研究[J].绝缘材料,2006,39(1):19.WANG Pengguo,ZHONG Lisheng,MA Sude,et al. Study onaging characteristis of polymer optical fibers[J]. Insulating Mate-rials,2006,39(1):19.
[14]王旗,阴春晓,林嘉扬,等.换流站阀厅光纤局部放电原因分析[J].绝缘材料,2015,48(10):55.WANG Qi,YIN Chunxiao,LIN Jiayang,et al. Analysis on opti-cal fiber partial discharge of valve hall in converter station[J].Insulating Materials,2015,48(10):55.