Article(id=1192878365880234242, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1192878363166523716, articleNumber=null, orderNo=null, doi=10.16790/j.cnki.1009-9239.im.2025.01.009, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1709654400000, receivedDateStr=2024-03-06, revisedDate=1711814400000, revisedDateStr=2024-03-31, acceptedDate=null, acceptedDateStr=null, onlineDate=1762333965033, onlineDateStr=2025-11-05, pubDate=1737302400000, pubDateStr=2025-01-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1762333965033, onlineIssueDateStr=2025-11-05, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1762333965033, creator=13701087609, updateTime=1762333965033, updator=13701087609, issue=Issue{id=1192878363166523716, tenantId=1146029695717560320, journalId=1149653034449285133, year='2025', volume='58', issue='1', pageStart='1', pageEnd='144', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1762333964387, creator=13701087609, updateTime=1762334342663, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1192879949821395698, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1192878363166523716, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1192879949821395699, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1192878363166523716, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=74, endPage=81, ext={EN=ArticleExt(id=1192878366832341252, articleId=1192878365880234242, tenantId=1146029695717560320, journalId=1149653034449285133, language=EN, title=Effect of thermal ageing on partial discharge characteristics of main insulation at the end of hydro generator stator bar, columnId=1190369198472794288, journalTitle=Insulating Materials, columnName=Insulation Technology, runingTitle=null, highlight=null, articleAbstract=
The main insulation of hydro generator stator bar ends is susceptible to thermal ageing due to temperature rise and bombardment of high-energy particles from partial discharges during long-term operation, which would deteriorate the insulation performance and intensify the partial discharges. In this paper, three kinds of typical end defect models were made according to the insulation structure of F-class stator bar for hydropower station, and accelerated thermal ageing tests were carried out at 170℃. The morphological structure and molecular structure of the main insulation samples under different ageing cycles were analyzed by scanning electron microscope and Raman spectrometer to reveal the thermal ageing mechanism of main insulating material, which is epoxy glass mica tape. A partial discharge test platform was set up, the changes of discharge amount, discharge number, and ozone concentration before and after ageing were measured by the pulse current method and ozone detection method, and their influence law on the partial discharge characteristics of end defects were explored. The results show that the accelerated thermal ageing cycle is proportional to the insulating structure change of the main insulating material, and the longer the ageing time, the rougher the surface of the samples. Thermal ageing destroys the molecular chain structure of the epoxy glass mica tape, and the characteristic peak changes of C-C bond and C=C bond on the benzene ring and other aromatic and carbon rings have correlation with the insulation resistance. Thermal ageing has a small effect on the discharge amount and discharge number of the internal air gap, and has a large effect on the discharge number of low discharge amount of the anti-corona layer shedding defects. The saturation concentration and saturation time of ozone in different insulation defect models have large differences, and the changes of ozone concentration of different discharge types before ageing have stage growth characteristics, while the ozone concentration after ageing has no obvious stage growth characteristics.
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水轮发电机定子线棒端部主绝缘在长期运行过程中因温升及局部放电的高能粒子轰击极易发生热老化,劣化绝缘性能,加剧局部放电强度。文中根据水电站F级定子线棒绝缘结构设计制作了3种端部典型缺陷模型,在170℃环境条件下进行加速热老化;通过扫描电子显微镜和拉曼光谱分析仪对不同老化周期下的主绝缘试样进行形貌结构和分子结构分析,揭示主绝缘材料——环氧玻璃粉云母带的热老化机理;搭建局放试验平台,采用脉冲电流法和臭氧检测法测量老化前后放电量和放电次数及臭氧浓度的变化情况,并挖掘其对端部缺陷局部放电特性的影响规律。结果表明:加速热老化周期与主绝缘材料绝缘结构变化成正比,老化时间越长,试样表面越粗糙;热老化会破坏环氧玻璃粉云母带的分子链结构,苯环等芳香族和碳环上的C-C键及C=C键特征峰变化与绝缘电阻具有相关性;热老化对内部气隙放电量和放电次数的影响较小,对防晕层脱落缺陷的低放电量次数影响较大;不同绝缘缺陷模型臭氧的饱和浓度和饱和时间存在较大差异,热老化前不同放电类型的臭氧浓度变化具有阶段性,而热老化后臭氧浓度无明显的阶段性增长特征。
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马山刚(1983-),男(回族),青海门源人,教授,博士,主要从事新能源发电与电气新技术研究的工作。
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陈科元(1999-),男(汉族),陕西商洛人,硕士生,研究方向为水轮发电机定子线棒局部放电在线监测。
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1, 2, address=1. College of Energy and Electrical Engineering, Qinghai University, Xining 810016, China
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陈科元(1999-),男(汉族),陕西商洛人,硕士生,研究方向为水轮发电机定子线棒局部放电在线监测。
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陈科元(1999-),男(汉族),陕西商洛人,硕士生,研究方向为水轮发电机定子线棒局部放电在线监测。
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Schematic diagram of wire rod insulation structure, figureFileSmall=Q93517ejsLxw2p2+NCKJhw==, figureFileBig=aSJUVzK/g84GTeNj1a+oHQ==, tableContent=null), ArticleFig(id=1193252872826617861, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图1, caption=
线棒绝缘结构示意图, figureFileSmall=Q93517ejsLxw2p2+NCKJhw==, figureFileBig=aSJUVzK/g84GTeNj1a+oHQ==, tableContent=null), ArticleFig(id=1193252873879388167, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Fig.2, caption=
Physical drawing of the internal air gap defect model in main insulation, figureFileSmall=p40zzlpY934NZd0Fne2WNA==, figureFileBig=Y28JnBS6RXgC0hc660aXKQ==, tableContent=null), ArticleFig(id=1193252873959079946, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图2, caption=
主绝缘内部气隙缺陷模型实物图, figureFileSmall=p40zzlpY934NZd0Fne2WNA==, figureFileBig=Y28JnBS6RXgC0hc660aXKQ==, tableContent=null), ArticleFig(id=1193252874051354636, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Fig.3, caption=
Partial discharge test platform, figureFileSmall=eceGPPXj9hpZqtGogrF0fA==, figureFileBig=BAMU54mxKwaiVX3k6lP/NQ==, tableContent=null), ArticleFig(id=1193252874114269197, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图3, caption=
局部放电试验平台, figureFileSmall=eceGPPXj9hpZqtGogrF0fA==, figureFileBig=BAMU54mxKwaiVX3k6lP/NQ==, tableContent=null), ArticleFig(id=1193252874193960975, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Fig.4, caption=
Surface morphology of insulation samples before and after thermal ageing, figureFileSmall=WyfsZlwJKfLcdgb2JeEqJg==, figureFileBig=EbvLYzt1AHkDn6cUQsLK7g==, tableContent=null), ArticleFig(id=1193252874252681233, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图4, caption=
热老化前后绝缘试样表面形貌, figureFileSmall=WyfsZlwJKfLcdgb2JeEqJg==, figureFileBig=EbvLYzt1AHkDn6cUQsLK7g==, tableContent=null), ArticleFig(id=1193252874328178707, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Fig.5, caption=
Raman spectra of insulation samples surface before and after thermal ageing, figureFileSmall=tw3WfF7sa8dzjyXmEGVqtA==, figureFileBig=eDZaAoqQ7b0xOfGurzc5uw==, tableContent=null), ArticleFig(id=1193252874399481876, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图5, caption=
热老化前后绝缘试样表面拉曼谱图, figureFileSmall=tw3WfF7sa8dzjyXmEGVqtA==, figureFileBig=eDZaAoqQ7b0xOfGurzc5uw==, tableContent=null), ArticleFig(id=1193252874495950870, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Fig.6, caption=
Change in maximum discharge of defect models before and after thermal ageing, figureFileSmall=BXFo/wm1rjIXqxE3G1ff5Q==, figureFileBig=3zyGq4oYHm+VtyOQPvX5HA==, tableContent=null), ArticleFig(id=1193252874554671128, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图6, caption=
热老化前后缺陷模型最大放电量变化, figureFileSmall=BXFo/wm1rjIXqxE3G1ff5Q==, figureFileBig=3zyGq4oYHm+VtyOQPvX5HA==, tableContent=null), ArticleFig(id=1193252874625974298, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Fig.7, caption=
Change in discharge number of defect models before and after thermal ageing, figureFileSmall=nqil1g80VUPf3ymoG+d1Xg==, figureFileBig=wThrWdb+bdkV03EgPq/ZCw==, tableContent=null), ArticleFig(id=1193252874697277468, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图7, caption=
热老化前后缺陷模型放电次数变化, figureFileSmall=nqil1g80VUPf3ymoG+d1Xg==, figureFileBig=wThrWdb+bdkV03EgPq/ZCw==, tableContent=null), ArticleFig(id=1193252874764386334, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Fig.8, caption=
Variation of ozone concentration in defect models before thermal ageing, figureFileSmall=t+i1SUMMdEMIAd2k8l2fdw==, figureFileBig=LhRHhkmcwceAE/pHeP2CmA==, tableContent=null), ArticleFig(id=1193252874848272416, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图8, caption=
热老化前缺陷模型臭氧浓度变化, figureFileSmall=t+i1SUMMdEMIAd2k8l2fdw==, figureFileBig=LhRHhkmcwceAE/pHeP2CmA==, tableContent=null), ArticleFig(id=1193252874915381282, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Fig.9, caption=
Change in ozone concentration in defect model after thermal ageing, figureFileSmall=u090Gm7AS7Kjr59PGNPU1A==, figureFileBig=kaSicd9ehQYJdg+PmLp5KQ==, tableContent=null), ArticleFig(id=1193252874982490148, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=图9, caption=
热老化后缺陷模型臭氧浓度变化, figureFileSmall=u090Gm7AS7Kjr59PGNPU1A==, figureFileBig=kaSicd9ehQYJdg+PmLp5KQ==, tableContent=null), ArticleFig(id=1193252875045404710, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Table 1, caption=
Specific parameters of vacuum drying oven, figureFileSmall=null, figureFileBig=null, tableContent=
| 型号 | 工作电源 | 功率 | 升温时间 | 温度范围 |
| DZF | AC220 V/50 Hz | 300 W | <100 min | 20~250℃ |
), ArticleFig(id=1193252875108319272, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=表1, caption=
真空干燥箱具体参数
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| 型号 | 工作电源 | 功率 | 升温时间 | 温度范围 |
| DZF | AC220 V/50 Hz | 300 W | <100 min | 20~250℃ |
), ArticleFig(id=1193252875196399658, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Table 2, caption=
Raman spectral analysis of insulation samples at various stages of thermal ageing, figureFileSmall=null, figureFileBig=null, tableContent=
| 热老化试样 | 拉曼位移/(cm-1) | 振动模式 |
| 未热老化处理 | 243 | 硅氧拉伸振动 |
| 391 | Si-O-Si拉伸振动 |
| 637 | Si-O-Si弯曲振动 |
| 822 | 芳香族C-C键拉伸振动 |
| 1 100~1 300 | Si-O-C伸缩振动区 |
| 1 605 | 苯环中C=C键的拉伸振动 |
| 热老化2 d | 245 | 硅氧拉伸振动 |
| 638 | Si-O-Si弯曲振动 |
| 808 | 芳香族C-C键拉伸振动 |
| 1 100~1 300 | Si-O-C伸缩振动区 |
| 1 605 | 苯环中C=C键的拉伸振动 |
| 热老化4 d | 639 | Si-O-Si弯曲振动 |
| 1 100~1 300 | Si-O-C伸缩振动区 |
| 1 607 | 苯环中C=C键的拉伸振动 |
| 热老化6 d | 1 100~1 300 | Si-O-C伸缩振动区 |
| 1 609 | 苯环中C=C键的拉伸振动 |
), ArticleFig(id=1193252875276091436, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=表2, caption=
热老化各阶段绝缘试样拉曼谱分析
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| 热老化试样 | 拉曼位移/(cm-1) | 振动模式 |
| 未热老化处理 | 243 | 硅氧拉伸振动 |
| 391 | Si-O-Si拉伸振动 |
| 637 | Si-O-Si弯曲振动 |
| 822 | 芳香族C-C键拉伸振动 |
| 1 100~1 300 | Si-O-C伸缩振动区 |
| 1 605 | 苯环中C=C键的拉伸振动 |
| 热老化2 d | 245 | 硅氧拉伸振动 |
| 638 | Si-O-Si弯曲振动 |
| 808 | 芳香族C-C键拉伸振动 |
| 1 100~1 300 | Si-O-C伸缩振动区 |
| 1 605 | 苯环中C=C键的拉伸振动 |
| 热老化4 d | 639 | Si-O-Si弯曲振动 |
| 1 100~1 300 | Si-O-C伸缩振动区 |
| 1 607 | 苯环中C=C键的拉伸振动 |
| 热老化6 d | 1 100~1 300 | Si-O-C伸缩振动区 |
| 1 609 | 苯环中C=C键的拉伸振动 |
), ArticleFig(id=1193252875347394606, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=EN, label=Table 3, caption=
Insulation resistance measurement results, figureFileSmall=null, figureFileBig=null, tableContent=
| 绝缘缺陷模型 | 热老化阶段 | 绝缘电阻/MΩ |
| 主绝缘内部气隙缺陷模型 | 未热老化处理 | 468 |
| 热老化2 d | 452 |
| 热老化4 d | 381 |
| 热老化6 d | 259 |
| 防晕层脱落缺陷模型 | 未热老化处理 | 392 |
| 热老化2 d | 364 |
| 热老化4 d | 275 |
| 热老化6 d | 135 |
| 主绝缘磨损与油污缺陷模型 | 未热老化处理 | 376 |
| 热老化2 d | 361 |
| 热老化4 d | 243 |
| 热老化6 d | 101 |
), ArticleFig(id=1193252875435474992, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878365880234242, language=CN, label=表3, caption=
绝缘电阻测量结果
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| 绝缘缺陷模型 | 热老化阶段 | 绝缘电阻/MΩ |
| 主绝缘内部气隙缺陷模型 | 未热老化处理 | 468 |
| 热老化2 d | 452 |
| 热老化4 d | 381 |
| 热老化6 d | 259 |
| 防晕层脱落缺陷模型 | 未热老化处理 | 392 |
| 热老化2 d | 364 |
| 热老化4 d | 275 |
| 热老化6 d | 135 |
| 主绝缘磨损与油污缺陷模型 | 未热老化处理 | 376 |
| 热老化2 d | 361 |
| 热老化4 d | 243 |
| 热老化6 d | 101 |
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