Article(id=1209928454598947782, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1209928452547933122, articleNumber=null, orderNo=null, doi=10.16790/j.cnki.1009-9239.im.2024.06.016, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1686844800000, receivedDateStr=2023-06-16, revisedDate=1687881600000, revisedDateStr=2023-06-28, acceptedDate=null, acceptedDateStr=null, onlineDate=1766399022960, onlineDateStr=2025-12-22, pubDate=1718812800000, pubDateStr=2024-06-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1766399022960, onlineIssueDateStr=2025-12-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1766399022960, creator=13701087609, updateTime=1766399022960, updator=13701087609, issue=Issue{id=1209928452547933122, tenantId=1146029695717560320, journalId=1149653034449285133, year='2024', volume='57', issue='6', pageStart='1', pageEnd='120', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1766399022471, creator=13701087609, updateTime=1766563931405, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1210620130816561673, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1209928452547933122, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1210620130816561674, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1209928452547933122, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=108, endPage=115, ext={EN=ArticleExt(id=1209928454808662985, articleId=1209928454598947782, tenantId=1146029695717560320, journalId=1149653034449285133, language=EN, title=Study on insulating material characteristics of MgO cable and its ampacity evaluation method, columnId=1192878364340924664, journalTitle=Insulating Materials, columnName=Test and Analysis, runingTitle=null, highlight=null, articleAbstract=
In order to study the insulating material characteristics of MgO cable and its ampacity evaluation method, in this paper, morphology observation and composition analysis were conducted on MgO powder to determine its purity and inclusions at first. And then the dielectric and thermal characteristic parameters of MgO powder were measured, and the influence of moisture on the dielectric parameters was analyzed. Finally, an equivalent thermal curcuit model for MgO insulated multi-core cables and a simplified analytical algorithm for ampacity were proposed, which was validated by a two-dimensional numerical simulation model. The results show that the volume resistivity of dry MgO samples is higher than 1012 Ω·m, which can decrease by more than 1 order of magnitude under the effect of moisture. In the frequency range of 10-1‒104 Hz, the dielectric constant of the dry MgO sample is about 7.9, and the dielectric loss factor is about 5×10-4‒5×10-3, which increases significantly after being moisture exposed, especially in the low frequency range. The electric strength of the dry MgO is 3.5‒4.8 kV/mm, and the data measured by different methods have a certain degree of dispersion. The rated ampacity of MgO insulated multi-core cable can be evaluated accurently by using the simplified analytical algorithm, which is beneficial to practical engineering applications.
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为研究氧化镁电缆绝缘材料的特性及载流量评估方法,本文首先对氧化镁粉体进行了形貌观测和物相分析,确定其纯度及杂质成分;然后测量了氧化镁粉体的介电及导热性能参数,分析了受潮对材料介电参数的影响;最后提出针对氧化镁绝缘多芯电缆的等效热路模型及载流量简化解析算法,并通过二维数值仿真对解析算法进行了有效性验证。结果表明:干燥氧化镁粉体的体积电阻率在1012 Ω·m以上,受潮会使其电阻率下降超过1个数量级;在10-1~104 Hz频率范围内,干燥MgO试样的介电常数约为7.9,介质损耗因数约为5×10-4~5×10-3,受潮后介质损耗因数明显增大,特别是低频范围增幅明显;干燥MgO试样的电气强度为3.5~4.8 kV/mm,不同方法测得的数据有一定分散性;利用简化解析算法可对多芯氧化镁电缆的额定载流量进行准确评估,对于实际工程应用有利。
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魏燕杰(1998-),女(汉族),山东聊城人,硕士生,主要从事电缆绝缘材料性能分析及载流量计算的研究工作;
刘英(1976-),女(汉族),四川资阳人,教授,主要从事绝缘结构设计及性能测试、电缆工程计算及状态评估等方面的研究。
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魏燕杰(1998-),女(汉族),山东聊城人,硕士生,主要从事电缆绝缘材料性能分析及载流量计算的研究工作;
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魏燕杰(1998-),女(汉族),山东聊城人,硕士生,主要从事电缆绝缘材料性能分析及载流量计算的研究工作;
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刘英(1976-),女(汉族),四川资阳人,教授,主要从事绝缘结构设计及性能测试、电缆工程计算及状态评估等方面的研究。
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刘英(1976-),女(汉族),四川资阳人,教授,主要从事绝缘结构设计及性能测试、电缆工程计算及状态评估等方面的研究。
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SEM of MgO sample under two different agnifications, figureFileSmall=/PYNAVzXdydYba3UvwGOCA==, figureFileBig=2x2HWMEQPV0D/26JWIegEg==, tableContent=null), ArticleFig(id=1217500320763134212, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图1, caption=
不同放大倍数下氧化镁试样的SEM形貌图, figureFileSmall=/PYNAVzXdydYba3UvwGOCA==, figureFileBig=2x2HWMEQPV0D/26JWIegEg==, tableContent=null), ArticleFig(id=1217500320863797512, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.2, caption=
XRD diffraction diagram of MgO sample, figureFileSmall=yVVYwVPy1Tf5aX3EN2cGnQ==, figureFileBig=EVaVyZJwtvAonJuoMwIqjQ==, tableContent=null), ArticleFig(id=1217500320951877900, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图2, caption=
氧化镁试样的XRD衍射图谱, figureFileSmall=yVVYwVPy1Tf5aX3EN2cGnQ==, figureFileBig=EVaVyZJwtvAonJuoMwIqjQ==, tableContent=null), ArticleFig(id=1217500321060929809, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.3, caption=
End surfaces of coaxial electrodes with filled samples, figureFileSmall=Ef98vhAw8XOaVhwn33AURw==, figureFileBig=tQFObHtrummrzAxqNS+AHQ==, tableContent=null), ArticleFig(id=1217500321128038677, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图3, caption=
试样灌装完成的同轴电极端面, figureFileSmall=Ef98vhAw8XOaVhwn33AURw==, figureFileBig=tQFObHtrummrzAxqNS+AHQ==, tableContent=null), ArticleFig(id=1217500321211924759, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.4, caption=
The resistivity data of MgO samples measured by different electrode systems, figureFileSmall=/jPWR9wshcDdVROdmbNOuQ==, figureFileBig=b3EK89tJwWTvU0CV/RRcxQ==, tableContent=null), ArticleFig(id=1217500321333559581, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图4, caption=
不同电极系统测得的MgO试样绝缘电阻率, figureFileSmall=/jPWR9wshcDdVROdmbNOuQ==, figureFileBig=b3EK89tJwWTvU0CV/RRcxQ==, tableContent=null), ArticleFig(id=1217500321421639968, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.5, caption=
The dielectric frequency spectrum of MgO samples, figureFileSmall=kSu2ELQd5n6+pvfGcsPVUg==, figureFileBig=jcil7KT6C4zmgKvdWEgPcQ==, tableContent=null), ArticleFig(id=1217500321513914660, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图5, caption=
MgO试样的介电频谱, figureFileSmall=kSu2ELQd5n6+pvfGcsPVUg==, figureFileBig=jcil7KT6C4zmgKvdWEgPcQ==, tableContent=null), ArticleFig(id=1217500321622966571, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.6, caption=
The Weibull distribution of breakdown data of MgO plate samples, figureFileSmall=8w3ZTQjBZXDa0o2n9Ru7Bg==, figureFileBig=mhmKQ1bY/6UEwELVQ5PJ9Q==, tableContent=null), ArticleFig(id=1217500321719435569, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图6, caption=
氧化镁片状试样击穿数据的Weibull分布图, figureFileSmall=8w3ZTQjBZXDa0o2n9Ru7Bg==, figureFileBig=mhmKQ1bY/6UEwELVQ5PJ9Q==, tableContent=null), ArticleFig(id=1217500321853653302, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.7, caption=
The thermal conductivity of MgO sample under different temperatures, figureFileSmall=Ub0mW8UUX6Vw/50m1woHzw==, figureFileBig=7Qyde7PTwV6C7lDHWCAsfA==, tableContent=null), ArticleFig(id=1217500321987871035, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图7, caption=
不同温度下氧化镁试样的导热系数, figureFileSmall=Ub0mW8UUX6Vw/50m1woHzw==, figureFileBig=7Qyde7PTwV6C7lDHWCAsfA==, tableContent=null), ArticleFig(id=1217500322092728636, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.8, caption=
Cross-section pictures of multicore MgO cables, figureFileSmall=T8NzusOp/iugcLipbnbb+g==, figureFileBig=EO61Q83U5vwCT8nkQ/PfxQ==, tableContent=null), ArticleFig(id=1217500322197586239, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图8, caption=
氧化镁多芯电缆截面图, figureFileSmall=T8NzusOp/iugcLipbnbb+g==, figureFileBig=EO61Q83U5vwCT8nkQ/PfxQ==, tableContent=null), ArticleFig(id=1217500322264695105, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.9, caption=
Equivalent thermal circuit model of multicore MgO cable, figureFileSmall=Kwttroq6/1Yiumy0LTLNLg==, figureFileBig=4hMFtU6KMFlf4KqzXWKtBw==, tableContent=null), ArticleFig(id=1217500323577512260, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图9, caption=
多芯MgO电缆的等效热路模型, figureFileSmall=Kwttroq6/1Yiumy0LTLNLg==, figureFileBig=4hMFtU6KMFlf4KqzXWKtBw==, tableContent=null), ArticleFig(id=1217500323678175560, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Fig.10, caption=
Thermal field distribution of the multicore MgO cables with full load, figureFileSmall=S2IRvCpaJjkR5qDue0/pHQ==, figureFileBig=J6edqddIerQItqPDSIdQqg==, tableContent=null), ArticleFig(id=1217500323753673035, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=图10, caption=
多芯氧化镁电缆满载运行时的热场分布, figureFileSmall=S2IRvCpaJjkR5qDue0/pHQ==, figureFileBig=J6edqddIerQItqPDSIdQqg==, tableContent=null), ArticleFig(id=1217500323837559118, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Tab.1, caption=
X-ray fluorescence spectrum results of the MgO sample, figureFileSmall=null, figureFileBig=null, tableContent=
| 成分 | MgO | SiO2 | CaO | Al2O3 | SO3 | Cl | As2O3 |
|---|
| 质量分数/% | 91.9 | 3.49 | 3.11 | 0.83 | 0.33 | 0.281 | 0.046 |
), ArticleFig(id=1217500323946611025, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=表1, caption=
MgO试样的X射线荧光光谱测试结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 成分 | MgO | SiO2 | CaO | Al2O3 | SO3 | Cl | As2O3 |
|---|
| 质量分数/% | 91.9 | 3.49 | 3.11 | 0.83 | 0.33 | 0.281 | 0.046 |
), ArticleFig(id=1217500324038885718, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Tab.2, caption=
Dimensions of two coaxial electrodes, figureFileSmall=null, figureFileBig=null, tableContent=
| 电极名称 | 电极间隙参数 |
|---|
| 宽度/mm | 内径/mm | 外径/mm | 高度/mm |
|---|
| 2 mm电极 | 2 | 25 | 29 | 200 |
| 6 mm电极 | 6 | 20 | 32 | 200 |
), ArticleFig(id=1217500324152131931, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=表2, caption=
两个同轴电极的基本尺寸
, figureFileSmall=null, figureFileBig=null, tableContent=
| 电极名称 | 电极间隙参数 |
|---|
| 宽度/mm | 内径/mm | 外径/mm | 高度/mm |
|---|
| 2 mm电极 | 2 | 25 | 29 | 200 |
| 6 mm电极 | 6 | 20 | 32 | 200 |
), ArticleFig(id=1217500324231823710, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Tab.3, caption=
The resistivity of MgO samples measured by the coaxial electrodes, figureFileSmall=null, figureFileBig=null, tableContent=
| 电极 | 样品状态 | 密度/(g/cm3) | 电阻率/(Ω·m) |
|---|
| 2 mm电极 | 受潮 | 2.20 | 2.06×1013 |
| 干燥 | 2.20 | 3.94×1014 |
| 6 mm电极 | 受潮 | 2.02 | 1.51×1013 |
| 干燥 | 2.07 | 3.01×1014 |
), ArticleFig(id=1217500324332487012, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=表3, caption=
氧化镁试样的绝缘电阻率(同轴电极测量)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 电极 | 样品状态 | 密度/(g/cm3) | 电阻率/(Ω·m) |
|---|
| 2 mm电极 | 受潮 | 2.20 | 2.06×1013 |
| 干燥 | 2.20 | 3.94×1014 |
| 6 mm电极 | 受潮 | 2.02 | 1.51×1013 |
| 干燥 | 2.07 | 3.01×1014 |
), ArticleFig(id=1217500324437344614, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Tab.4, caption=
The resistivity of MgO samples, figureFileSmall=null, figureFileBig=null, tableContent=
| 电极 | 样品状态 | 密度/(g/cm3) | 电阻率/(Ω·m) |
|---|
| 平板三电极 | 干燥 | 2.43 | 8.52×1012 |
| 受潮 | 2.43 | 1.02×1011 |
| 干燥 | 2.56 | 7.57×1012 |
), ArticleFig(id=1217500324525425002, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=表4, caption=
氧化镁试样的绝缘电阻率
, figureFileSmall=null, figureFileBig=null, tableContent=
| 电极 | 样品状态 | 密度/(g/cm3) | 电阻率/(Ω·m) |
|---|
| 平板三电极 | 干燥 | 2.43 | 8.52×1012 |
| 受潮 | 2.43 | 1.02×1011 |
| 干燥 | 2.56 | 7.57×1012 |
), ArticleFig(id=1217500324621893998, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Tab.5, caption=
The ampacity results of MgO cables based on the equivalent thermal circuit model, figureFileSmall=null, figureFileBig=null, tableContent=
| 截面积/mm2 | 载流量/A |
|---|
| 两芯 | 三芯 | 四芯 |
|---|
| 1 | 26 | 22 | 22 |
| 1.5 | 33 | 27 | 28 |
| 2.5 | 43 | 36 | 37 |
| 4 | 58 | 48 | 50 |
| 6 | 73 | 61 | 63 |
| 10 | 101 | 85 | 87 |
| 16 | 134 | 113 | 117 |
| 25 | 178 | 150 | 155 |
), ArticleFig(id=1217500324689002866, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=表5, caption=
基于等效热路计算的MgO电缆允许载流量
, figureFileSmall=null, figureFileBig=null, tableContent=
| 截面积/mm2 | 载流量/A |
|---|
| 两芯 | 三芯 | 四芯 |
|---|
| 1 | 26 | 22 | 22 |
| 1.5 | 33 | 27 | 28 |
| 2.5 | 43 | 36 | 37 |
| 4 | 58 | 48 | 50 |
| 6 | 73 | 61 | 63 |
| 10 | 101 | 85 | 87 |
| 16 | 134 | 113 | 117 |
| 25 | 178 | 150 | 155 |
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Structural and thermal parameters of the multicore MgO cables, figureFileSmall=null, figureFileBig=null, tableContent=
| 电缆类型 | 结构名称 | 厚度/mm | 内径/mm | 外径/mm | 导热系数/(W/(m·K)) |
|---|
| 两芯 | 铜导体 | — | — | 5.64 | 400 |
| 绝缘层 | 1.30 | — | 15.4 | 1.28 |
| 铜护套 | 0.85 | 15.40 | 17.1 | 400 |
| 三芯 | 铜导体 | — | — | 5.64 | 400 |
| 绝缘层 | 1.30 | — | 16.46 | 1.28 |
| 铜护套 | 0.87 | 16.46 | 18.2 | 400 |
| 四芯 | 铜导体 | — | — | 5.64 | 400 |
| 绝缘层 | 1.30 | — | 18.24 | 1.28 |
| 铜护套 | 0.93 | 18.24 | 20.1 | 400 |
), ArticleFig(id=1217500324886135158, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=表6, caption=
多芯MgO电缆的结构及热学参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 电缆类型 | 结构名称 | 厚度/mm | 内径/mm | 外径/mm | 导热系数/(W/(m·K)) |
|---|
| 两芯 | 铜导体 | — | — | 5.64 | 400 |
| 绝缘层 | 1.30 | — | 15.4 | 1.28 |
| 铜护套 | 0.85 | 15.40 | 17.1 | 400 |
| 三芯 | 铜导体 | — | — | 5.64 | 400 |
| 绝缘层 | 1.30 | — | 16.46 | 1.28 |
| 铜护套 | 0.87 | 16.46 | 18.2 | 400 |
| 四芯 | 铜导体 | — | — | 5.64 | 400 |
| 绝缘层 | 1.30 | — | 18.24 | 1.28 |
| 铜护套 | 0.93 | 18.24 | 20.1 | 400 |
), ArticleFig(id=1217500324978409851, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=EN, label=Tab.7, caption=
Comparison of cable ampacity results obtained by analytical and numerical method, figureFileSmall=null, figureFileBig=null, tableContent=
| 电缆类型 | 允许载流量/A | 偏差/% |
|---|
| 解析法 | 数值法 |
|---|
| 两芯 | 178.4 | 182.3 | 2.14 |
| 三芯 | 150.0 | 154.4 | 2.85 |
| 四芯 | 155.4 | 162.0 | 4.07 |
), ArticleFig(id=1217500325079073148, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209928454598947782, language=CN, label=表7, caption=
电缆载流量的解析法与数值法结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 电缆类型 | 允许载流量/A | 偏差/% |
|---|
| 解析法 | 数值法 |
|---|
| 两芯 | 178.4 | 182.3 | 2.14 |
| 三芯 | 150.0 | 154.4 | 2.85 |
| 四芯 | 155.4 | 162.0 | 4.07 |
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