Article(id=1193546749827580736, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1193543214067056904, articleNumber=null, orderNo=null, doi=10.16790/j.cnki.1009-9239.im.2025.03.017, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1718899200000, receivedDateStr=2024-06-21, revisedDate=1724860800000, revisedDateStr=2024-08-29, acceptedDate=null, acceptedDateStr=null, onlineDate=1762493320184, onlineDateStr=2025-11-07, pubDate=1742400000000, pubDateStr=2025-03-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1762493320184, onlineIssueDateStr=2025-11-07, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1762493320184, creator=13701087609, updateTime=1762493320184, updator=13701087609, issue=Issue{id=1193543214067056904, tenantId=1146029695717560320, journalId=1149653034449285133, year='2025', volume='58', issue='3', pageStart='1', pageEnd='157', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1762492477194, creator=13701087609, updateTime=1762498203949, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1193567233872982429, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1193543214067056904, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1193567233872982430, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1193543214067056904, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=152, endPage=157, ext={EN=ArticleExt(id=1193546750058267459, articleId=1193546749827580736, tenantId=1146029695717560320, journalId=1149653034449285133, language=EN, title=Influence mechanism analysis of water on breakdown position of oil-filled cable terminal, columnId=1193543215723806988, journalTitle=Insulating Materials, columnName=Special Issue on Advanced Cable Insulation, runingTitle=null, highlight=null, articleAbstract=

To investigate the influence of water on the breakdown position of oil-filled cable terminal, this study simulated and analyzed the failure reason caused by water in the 220 kV oil-filled cable terminal. A cable test platform was established in the laboratory, and the influence of the grounding state and electric field strength on the breakdown position was simulated. The partial discharge (PD) quantity and water film height of the cable in different grounding states and at different electric field strength were recorded by using high frequency current partial discharge detector and camera. The results show that the water content in oil, grounding state, and electric field strength are the important factors affecting the fault location of oil filled cable terminal. When the water is immersed in the cable terminal and reaches a certain amount, and the cable terminal is directly grounded, the higher the electric field strength, the more water molecules escape from the oil-water interface, the higher the water film height, the longer the distance between the breakdown point and the upper surface of stress cone, and the larger the partial discharge. The intensity of PD is positively correlated with water film height, and the silicone oil degradation defects within the cable terminal can be evaluated by partial discharge, which provides a reference for evaluating the insulation status of oil-filled cable terminal.

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为研究水对充油电缆终端击穿位置的影响,仿真分析了水引起的220 kV充油电缆终端的故障原因,并在实验室搭建了电缆试验平台,模拟验证了接地状态与电场强度对击穿位置的影响,并采用高频电流局放检测仪及摄像机分别记录了电缆在不同接地状态和电场强度下的局部放电量与水膜高度。结果表明:油中水含量、接地状态及电场强度是影响充油电缆终端故障点位置的重要因素。当水浸入电缆终端并达到一定量且电缆终端直接接地时,电场强度越高,水分子从油-水界面逸出越多,水膜高度越高,击穿点距离应力锥上表面的距离越长,局部放电量越大。局部放电程度与水膜高度正相关,可以通过局部放电评估电缆终端内硅油劣化缺陷程度,为充油电缆终端绝缘状态评估提供参考。

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张静(1986-),女(汉族),黑龙江佳木斯人,高级工程师,主要从事电力设备状态检测与评估技术的研究。

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张静(1986-),女(汉族),黑龙江佳木斯人,高级工程师,主要从事电力设备状态检测与评估技术的研究。

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张静(1986-),女(汉族),黑龙江佳木斯人,高级工程师,主要从事电力设备状态检测与评估技术的研究。

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Corrosion & Protection,2021,42(7):20-24., articleTitle=AC corrosion cha-racteristics of cable aluminum sheath in 3.5% NaCl solution, refAbstract=null)], funds=[Fund(id=1195076787391697636, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1193546749827580736, awardId=5500-2023 26176A-1-1-ZN, language=CN, fundingSource=国家电网有限公司总部科技项目(5500-2023 26176A-1-1-ZN), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1195076781712609944, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1193546749827580736, xref=1, ext=[AuthorCompanyExt(id=1195076781725192857, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1193546749827580736, companyId=1195076781712609944, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1 Nanrui Group (State Grid Electric Power Research Institute) Co., Ltd., Nanjing 211006, China), AuthorCompanyExt(id=1195076781733581466, 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部件名称 相对介电常数
电缆绝缘层 2.3
绝缘屏蔽层 10
应力锥绝缘 3.2
硅油 2.7
水及絮凝物 80
套管 6.5
空气 1.0
), ArticleFig(id=1195076787127456481, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1193546749827580736, language=CN, label=表1, caption=

材料参数

, figureFileSmall=null, figureFileBig=null, tableContent=
部件名称 相对介电常数
电缆绝缘层 2.3
绝缘屏蔽层 10
应力锥绝缘 3.2
硅油 2.7
水及絮凝物 80
套管 6.5
空气 1.0
), ArticleFig(id=1195076787211342562, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1193546749827580736, language=EN, label=Table 2, caption=Relation between water film height and partial discharge, figureFileSmall=null, figureFileBig=null, tableContent=
电压/kV 电场强度E/(kV/mm) 水膜高度/mm 局部放电量/pC
3 0.53 0 2.23
6 1.05 1.8 2.72
9 1.58 2.6 4.29
12 2.10 3.6 7.75
15 2.63 5.7 14.91
18 3.16 6.4 20.99
21 3.68 7.3 31.42
24 4.21 8.6 58.73
27 4.73 9.4 153.21
30 5.26 10.8 224.64
), ArticleFig(id=1195076787270062819, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1193546749827580736, language=CN, label=表2, caption=

水膜高度与局部放电量的关系

, figureFileSmall=null, figureFileBig=null, tableContent=
电压/kV 电场强度E/(kV/mm) 水膜高度/mm 局部放电量/pC
3 0.53 0 2.23
6 1.05 1.8 2.72
9 1.58 2.6 4.29
12 2.10 3.6 7.75
15 2.63 5.7 14.91
18 3.16 6.4 20.99
21 3.68 7.3 31.42
24 4.21 8.6 58.73
27 4.73 9.4 153.21
30 5.26 10.8 224.64
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水对充油电缆终端击穿位置的影响机理分析
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张静 1, 2 , 万成德 1, 2 , 程林 1, 2 , 胡长猛 1, 2 , 宋鹏先 3 , 黄勤清 1, 2
绝缘材料 | 先进电缆绝缘专题 2025,58(3): 152-157
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绝缘材料 | 先进电缆绝缘专题 2025, 58(3): 152-157
水对充油电缆终端击穿位置的影响机理分析
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张静1, 2, 万成德1, 2, 程林1, 2, 胡长猛1, 2, 宋鹏先3, 黄勤清1, 2
作者信息
  • 1 南瑞集团(国网电力科学研究院)有限公司,江苏 南京 211006
  • 2 国网电力科学研究院武汉南瑞有限责任公司,湖北 武汉 430074
  • 3 国网天津市电力公司电力科学研究院,天津 300384
  • 张静(1986-),女(汉族),黑龙江佳木斯人,高级工程师,主要从事电力设备状态检测与评估技术的研究。

Influence mechanism analysis of water on breakdown position of oil-filled cable terminal
Jing ZHANG1, 2, Chengde WAN1, 2, Lin CHENG1, 2, Changmeng HU1, 2, Pengxian SONG3, Qinqing HUANG1, 2
Affiliations
  • 1 Nanrui Group (State Grid Electric Power Research Institute) Co., Ltd., Nanjing 211006, China
  • 2 Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute, Wuhan 430074, China
  • 3 Tianjin Electric Power Research Institute of State Grid Tianjin Electric Power Company, Tianjin 300384, China
出版时间: 2025-03-20 doi: 10.16790/j.cnki.1009-9239.im.2025.03.017
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为研究水对充油电缆终端击穿位置的影响,仿真分析了水引起的220 kV充油电缆终端的故障原因,并在实验室搭建了电缆试验平台,模拟验证了接地状态与电场强度对击穿位置的影响,并采用高频电流局放检测仪及摄像机分别记录了电缆在不同接地状态和电场强度下的局部放电量与水膜高度。结果表明:油中水含量、接地状态及电场强度是影响充油电缆终端故障点位置的重要因素。当水浸入电缆终端并达到一定量且电缆终端直接接地时,电场强度越高,水分子从油-水界面逸出越多,水膜高度越高,击穿点距离应力锥上表面的距离越长,局部放电量越大。局部放电程度与水膜高度正相关,可以通过局部放电评估电缆终端内硅油劣化缺陷程度,为充油电缆终端绝缘状态评估提供参考。

电缆终端  /  绝缘油  /  水  /  电场仿真  /  接地状态  /  击穿位置

To investigate the influence of water on the breakdown position of oil-filled cable terminal, this study simulated and analyzed the failure reason caused by water in the 220 kV oil-filled cable terminal. A cable test platform was established in the laboratory, and the influence of the grounding state and electric field strength on the breakdown position was simulated. The partial discharge (PD) quantity and water film height of the cable in different grounding states and at different electric field strength were recorded by using high frequency current partial discharge detector and camera. The results show that the water content in oil, grounding state, and electric field strength are the important factors affecting the fault location of oil filled cable terminal. When the water is immersed in the cable terminal and reaches a certain amount, and the cable terminal is directly grounded, the higher the electric field strength, the more water molecules escape from the oil-water interface, the higher the water film height, the longer the distance between the breakdown point and the upper surface of stress cone, and the larger the partial discharge. The intensity of PD is positively correlated with water film height, and the silicone oil degradation defects within the cable terminal can be evaluated by partial discharge, which provides a reference for evaluating the insulation status of oil-filled cable terminal.

cable termination  /  insulating oil  /  water  /  electric field simulation  /  grounding state  /  breakdown position
张静, 万成德, 程林, 胡长猛, 宋鹏先, 黄勤清. 水对充油电缆终端击穿位置的影响机理分析. 绝缘材料, 2025 , 58 (3) : 152 -157 . DOI: 10.16790/j.cnki.1009-9239.im.2025.03.017
Jing ZHANG, Chengde WAN, Lin CHENG, Changmeng HU, Pengxian SONG, Qinqing HUANG. Influence mechanism analysis of water on breakdown position of oil-filled cable terminal[J]. Insulating Materials, 2025 , 58 (3) : 152 -157 . DOI: 10.16790/j.cnki.1009-9239.im.2025.03.017
绝缘油填充的电缆终端以其成熟的制造工艺和运行经验,在高压电缆终端中一直占有相当大的使用比例[1-6]。目前,电缆终端采用的绝缘油主要有硅油与聚异丁烯,两者具有性能稳定、绝缘强度高等优点。然而在运行过程中,由于受到氧气、湿度、高温、强电场和杂质等外界因素的作用,随着电缆终端运行时间的增加,绝缘油逐渐老化,造成终端的绝缘性能大幅降低,由此引起电缆终端发热甚至绝缘击穿的故障案例屡见不鲜[7-10]。E BERGIN[11]对60~500 kV户外电缆终端故障进行了统计,发现在2001年至2005年共发生7 456起击穿性故障,其中充油电缆终端的故障占到5 889起,绝缘油失效是该故障发生的重要原因之一。2011年以来,北京、上海、石家庄、深圳等多地发现运行10年左右的220 kV电缆线路的充油电缆终端被击穿,该类型电缆终端的应力锥材料为三元乙丙橡胶,填充的绝缘油为硅油[12-13],电缆绝缘层击穿点位置距离应力锥上表面20~70 mm处。由此可见,研究电缆终端内绝缘油老化及击穿特性,对有效预防电缆终端故障、评估电缆终端运行状态具有十分重要的意义。
本文采用有限元仿真对典型的故障电缆终端进行仿真,并搭建电缆试验平台,通过模拟不同接地状态与电场强度的作用,分析两者对击穿位置的影响,同时测量局部放电图谱,为电缆终端的运行维护提供理论依据。
选取故障的220 kV瓷套电缆终端为分析对象,线路的故障相击穿状态如图1(a)所示,同线路非故障相电缆终端绝缘层劣化情况见图1(b),其绝缘层表面有大面积水树枝现象。对非故障相进行解剖还发现终端内硅油性状已发生改变,硅油内悬浮着白色絮凝物,静置一段时间后,绝缘油出现分层,且硅油内含有大量水分。对同机组的非故障相进行解剖,发现故障线路电缆终端内硅油已因老化产生白色絮凝物,且含水量也比正常硅油显著升高。对水分来源进行分析,原因可能是电缆终端密封不严、安装时潮气进入、绝缘油含水量控制不严等。因此,可初步分析故障原因是故障电缆终端内硅油含有大量水和导电粒子,其中这些导电粒子受电场与温度场的影响,在电缆终端硅油内进行布朗运动及沉降运动,引起粒子间的碰撞、接触,微观作用力使得颗粒粘结,产生絮凝,进而形成了白色絮凝物。经成分分析白色絮凝物中含有磷酸、钾、钠、氢等离子以及P-H键小分子[14]
根据电缆终端结构,水分子和絮凝物在电缆终端内的状态包含下列过程:①硅油老化产生水及絮凝物[14],絮凝物在电缆终端底部法兰上沉积,沉积到一定程度时应力锥底部的硅油均被水及絮凝物取代。②受电缆终端内电场、温度场作用,沉积在底部的水及絮凝物沿应力锥侧面向上爬升,在绝缘薄弱的应力锥上表面电缆绝缘层上积聚,形成一个导电通道,见图2。③电缆终端底部法兰直接接地,由于硅油及絮凝物含有导电离子,使得絮凝物形成的导电通道均接地,在电场作用下,水及絮凝物附着在应力锥上形成了“三角形”区域,而“三角形”的顶点A点电场强度大于B点,引发电缆绝缘层在A点处击穿。通过分析,电缆绝缘层击穿位置A点主要受两个重要因素影响,一是导电通道处于接地状态,二是电缆终端内的水和絮凝物在电场作用下会沿应力锥表面向上爬升,形成“三角区”。
为进一步验证电缆终端内A点击穿的故障机理与水和絮凝物构成的导电通道接地状态的关联性,采用有限元仿真的方法分析电缆终端正常状态、导电通道不接地与接地3种不同状态时的电场分布。
根据故障的220 kV电缆终端的实际尺寸,建立了二维对称结构的电场仿真模型[15]。模型中材料的参数见表1。采用自由三角形网格对仿真模型进行自由网格剖分,在电缆绝缘、应力锥及伞裙处局部进行网格细化。模型边界条件根据实际运行电压设置,对电缆导体、均压环施加126 kV电位,对电缆金属护套、应力锥、金属法兰及空气场边界施加0电位。
选取应力锥上部“三角区”顶点(A点)、应力锥上表面与电缆绝缘层及硅油接触点(B点)的电场强度E与电缆绝缘层半径r数据绘制图3
图3(a)可以看出,当导电通道未接地时,电缆绝缘层A点的电场分布与正常运行的电缆终端的电场分布情况相似,靠近电缆导体的电缆绝缘层内径(r=0.020 m)承受较高电场,其电场强度为1.48 kV/mm,靠近绝缘屏蔽层的电缆绝缘层外径(r=0.045 m)承受较低电场,其电场强度为0.63 kV/mm,这一分布趋势是电缆绝缘层内电场分布的典型趋势[16]。当导电通道接地时,电缆绝缘层内部A点的电场分布趋势发生明显变化,呈现绝缘层中间电场低,靠近导体及绝缘屏蔽层的两端电场高的趋势,其中电缆绝缘层内径处电场强度高达6.35 kV/mm,是未接地时的4.29倍,而电缆绝缘层外径处电场强度为8.31 kV/mm,是未接地时的13.19倍。
对比图3(a)(b)可以看出,电缆绝缘层B点处的电场变化趋势与A点处相似,当导电通道接地时,电场强度分布趋势亦发生明显变化,呈现绝缘层中间电场低、两端电场高的趋势,电缆绝缘层内径处电场强度高达7.07 kV/mm,是未接地时(1.56 kV/mm)的4.53倍,而电缆绝缘层外径处的电场强度为5.86 kV/mm,是未接地时(0.80 kV/mm)的7.33倍。
综合对比电缆终端内导电通道不同接地状态下电缆绝缘层电场演变规律表明:电缆终端内硅油的水及絮凝物构成的导电通道未接地时,对终端内部电缆绝缘层电场分布影响不大,电场强度相较于正常运行的电缆终端变化也不大;而水及絮凝物中的导电离子构成的导电通道接地后,靠近电缆绝缘屏蔽层的绝缘层电场强度急剧增加,在高电场与硅油内部水的共同作用下引发电缆绝缘层表面的水树枝放电,且A点处的电场高于B点处的电场,从而引发A点处电缆绝缘层击穿。
为验证水及絮凝物在电场作用下会向上爬升形成“三角区”,结合接地状态的仿真,按照电缆终端的设计思路研制了用于模拟电缆终端外壳模型的小型实验箱,实验箱由厚度为5 mm的5块透明高聚物板组成,箱体尺寸为150 mm×150 mm×150 mm。在底板上开孔,将实验电缆穿入。实验箱内部放置铜管模拟接地极,并在实验箱侧壁开孔,使接地线与接地极相连,如图4所示。实验采用YJV1×95 8.7/10 kV型电缆,其导体直径为13.1 mm,绝缘层厚度为4.45 mm。
为模拟故障电缆终端内部的水及絮凝物,采用质量分数为3%的氯化钠(NaCl)水溶液构成具有导电离子的水[17-18],实验采用德国瓦克公司生产的TR50型低黏度硅油,此硅油闪点高、稳定性强、电气强度高,也是220 kV故障电缆终端内部填充硅油。控制实验箱内水面高度为43 mm,油面高度为100 mm,导体屏蔽层高度为23 mm。
实验平台如图5所示,由模型终端、变压器、100 pF并联耦合电容器、局放检测仪、实验箱、摄像机构成。实验开始前,测得局放背景噪声为2~4 pC。电压从0开始以3 kV为升压步进梯度逐步增加到30 kV,使电缆绝缘层外径处的径向电场强度从0.53 kV/mm增加到5.26 kV/mm。实验过程中采用摄像机监控电缆状态。每个电压水平维持30 min后,进行局部放电测量和录像。
实验模拟2种接地状态,一种为实验箱中的水不接地,将实验箱外部的绝缘屏蔽层接地,另一种为实验箱中的水与绝缘屏蔽层通过接地线接地。
当实验箱中的水未接地时,实验电压从0增加到30 kV(相当于5.26 kV/mm的电场强度)时,观察到随着电压升高,实验箱内油-水界面并未发生改变,如图6(a)所示。而将实验箱内水接地,外施电压为6 kV,电场强度为1.05 kV/mm时,油-水界面发生改变,水沿电缆绝缘层表面向上形成一层不规则的薄水膜,如图6(b)所示。在电场强度为2.63 kV/mm和5.26 kV/mm时,相应的状态图像如图7(c)(d)所示,可以看到水沿交联聚乙烯电缆表面向上拉伸,在油中形成锥形水电极,剖面为三角形,与图2应力锥上表面导电通道形状一致。
图7是局部放电图谱。从图7(a)可以看出,当实验箱内水不接地,而电缆绝缘外屏蔽层接地,外施电压低于27 kV时,测得局部放电水平变化很小,基本维持背景噪声水平。而当实验箱内水接地,随着外施电压升高,局部放电特征发生显著变化,首先在第三象限出现局部放电信号,见图7(b)。当电场强度增至5.26 kV/mm时,在第一象限和第三象限出现局部放电信号,见图7(c),此时放电类型与表面放电相近。
进一步研究水在电场作用下沿电缆绝缘层表面向上运动的不规则薄水膜的形成过程,对比分析其在不同电场作用下测得的局部放电量和水膜高度如表2所示。从表2可以看出,当电缆绝缘层外径处电场强度超过2.10 kV/mm时,水分子从油-水界面逸出并迅速向上移动。随着外施电压增大,电场强度不断增加,水分子进一步向上移动,局部放电量也显著增大,可见,水膜高度与局部放电密切相关,放电起始可能与锥形水电极的形成有关。
通过对比仿真与实验结果可以推断,当水浸入电缆终端并达到一定量后,无论硅油是否老化形成絮凝物沉积在应力锥上方,在电场作用下都能形成图2中的“三角区”。结合图3仿真得到故障电缆终端电场,当未形成导电通道,即“三角区”未接地时,电缆绝缘层外径电场约为0.62 kV/mm,根据模拟实验,水未接地时外施电压低于27 kV并不会产生明显局部放电。而当形成导电通道后,即“三角区”接地时,220 kV充油电缆终端内A点处,电缆绝缘层外径电场强度高达8.31 kV/mm,在高电场作用下,水膜高度将被拉伸很高,产生较大水平的局部放电,局部放电量超过200 pC。经过一段时间后,电缆绝缘层表面将在局部放电作用下被水分子劣化,最终引起电缆在A点处击穿。
(1)充油电缆终端内电缆绝缘层击穿受导电通道接地状态影响。水分子沿应力锥及电缆绝缘层表面向上运动形成导电通道,且当电缆终端直接接地时,电缆绝缘层电场畸变,可引发电缆绝缘击穿。
(2)击穿点位置与电缆绝缘层外径处电场强度相关。电场强度越高,水膜高度越高,电缆绝缘层击穿点距离应力锥上表面的距离越长。
(3)在电场作用下,水对充油电缆终端绝缘的劣化可以通过局部放电进行检测与诊断,缺陷形成导电通道后会在第一、三象限出现放电特征,且局部放电程度与水膜高度正相关。
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2025年第58卷第3期
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doi: 10.16790/j.cnki.1009-9239.im.2025.03.017
  • 接收时间:2024-06-21
  • 首发时间:2025-11-07
  • 出版时间:2025-03-20
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  • 收稿日期:2024-06-21
  • 修回日期:2024-08-29
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国家电网有限公司总部科技项目(5500-2023 26176A-1-1-ZN)
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    1 南瑞集团(国网电力科学研究院)有限公司,江苏 南京 211006
    2 国网电力科学研究院武汉南瑞有限责任公司,湖北 武汉 430074
    3 国网天津市电力公司电力科学研究院,天津 300384
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2种不同金属材料的力学参数

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属数
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genus
种数
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species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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