Article(id=1198665391607214960, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1198665390676083408, articleNumber=null, orderNo=null, doi=10.16790/j.cnki.1009-9239.im.2023.03.010, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1645632000000, receivedDateStr=2022-02-24, revisedDate=1649520000000, revisedDateStr=2022-04-10, acceptedDate=null, acceptedDateStr=null, onlineDate=1763713699484, onlineDateStr=2025-11-21, pubDate=1679241600000, pubDateStr=2023-03-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1763713699484, onlineIssueDateStr=2025-11-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1763713699484, creator=13701087609, updateTime=1763713699484, updator=13701087609, issue=Issue{id=1198665390676083408, tenantId=1146029695717560320, journalId=1149653034449285133, year='2023', volume='56', issue='3', pageStart='1', pageEnd='121', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1763713699263, creator=13701087609, updateTime=1766563510720, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1210618366327386648, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1198665390676083408, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1210618366327386649, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1198665390676083408, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=61, endPage=69, ext={EN=ArticleExt(id=1198665392655790963, articleId=1198665391607214960, tenantId=1146029695717560320, journalId=1149653034449285133, language=EN, title=Determination method of DC partial discharge test voltage for air gap defects at interface of ±320 kV DC cable termination, columnId=1190369198472794288, journalTitle=Insulating Materials, columnName=Insulation Technology, runingTitle=null, highlight=null, articleAbstract=
Partial discharge test has been widely used as an effective means of defect detection in AC system, but the partial discharge detection test method of DC cable is still in its infancy. In order to determine the field test voltage of DC partial discharge detection, the relationship between DC test voltage amplitude and air gap defect detection rate of ±320 kV cable prefabricated terminal was studied in this paper. Taking the air gap defect commonly existing on the composite interface of ±320 kV cable prefabricated terminal as the research object, we calculated the maximum electric field intensity in the air gap through multi physical field simulation, and whether the defect may produce partial discharge was judged by the electric field intensity exceeding the threshold. Based on the probability and statistical analysis, the partial discharge probability density function of cable joints under the condition of considering random factors such as cable operating temperature and air gap position was established, and the function equation between defect detection rate and ambient temperature and DC test voltage was presented. The results show that the function equation between the detection rate of air gap defect at the cable interface and the ambient temperature and DC partial discharge test voltage conforms to the fourth power function, and the detection rate increases with the increase of ambient temperature. If the DC test voltage is 1.85U0, the detection rate is 99.25% at 20℃, and the detection rate can reach 99.85% at 30℃. The DC test voltag amplitude can be determined by the function equation.
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局部放电试验作为交流系统中缺陷检测的有效手段得到了广泛使用,但是直流电缆的直流局放检测试验方法还处于初级阶段。为了确定直流局部放电检测的现场试验电压,本文研究了直流试验电压幅值与±320 kV电缆预制式终端气隙缺陷检出率之间的关系。将±320 kV电缆预制式终端复合界面上的气隙缺陷作为研究对象,通过多物理场仿真计算气隙缺陷内的最大电场强度,以电场强度超过阈值来判断该缺陷是否可能发生局部放电;基于概率统计分析,建立了考虑电缆运行温度和气隙位置等随机因素条件下电缆接头的局部放电概率密度函数,给出了缺陷检出率与环境温度和直流试验电压的函数关系式。结果表明:电缆界面的气隙缺陷检出率与环境温度和直流局放试验电压的函数关系式符合4次方幂函数关系式,且检出率水平随环境温度的升高而升高;若直流试验电压取1.85U0,20℃时的检出率为99.25%,30℃时的检出率可达99.85%。据此函数关系式可以确定直流试验电压幅值。
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程养春(1974-),男(汉族),陕西彬县人,教授,博导,主要从事输变电装备绝缘检测、故障诊断与状态评估技术的研究。
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赵洋(1979-),男(汉族),河南开封人,高级工程师,博士,主要从事高压电缆运维检修的工作。
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赵洋(1979-),男(汉族),河南开封人,高级工程师,博士,主要从事高压电缆运维检修的工作。
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Conductivity variation of two insulating materials, figureFileSmall=OsiBXEor6BE8nWwdrB/8cA==, figureFileBig=2Em8CLWLYR2O7/vDYlqYjQ==, tableContent=null), ArticleFig(id=1210986471415223095, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图3, caption=
两种绝缘材料的电导率变化, figureFileSmall=OsiBXEor6BE8nWwdrB/8cA==, figureFileBig=2Em8CLWLYR2O7/vDYlqYjQ==, tableContent=null), ArticleFig(id=1210986471478137656, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig.4, caption=
Temperature distribution in cable terminal at T=90℃, figureFileSmall=oXD/dcCN2zUrDlki2HktZg==, figureFileBig=+Tgozp88e8v74O2tGB+K5g==, tableContent=null), ArticleFig(id=1210986471536857913, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图4, caption=
T=90℃时电缆终端内的温度分布, figureFileSmall=oXD/dcCN2zUrDlki2HktZg==, figureFileBig=+Tgozp88e8v74O2tGB+K5g==, tableContent=null), ArticleFig(id=1210986471595578170, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig.5, caption=
Electric field distribution around air gap at T=90℃, figureFileSmall=TJEeSIuQsahB1KmqvnZWXw==, figureFileBig=iJGAM/M9ef7tyqM9oRrizQ==, tableContent=null), ArticleFig(id=1210986471654298427, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图5, caption=
T=90℃时气隙缺陷周围的电场分布, figureFileSmall=TJEeSIuQsahB1KmqvnZWXw==, figureFileBig=iJGAM/M9ef7tyqM9oRrizQ==, tableContent=null), ArticleFig(id=1210986471721407292, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig. 6, caption=
Variation trend of maximum air gap field strength with core working temperature, figureFileSmall=a96Zg6Q3cjincyXb+YHAGA==, figureFileBig=e65zMPmYXiYDaqFq6uflPw==, tableContent=null), ArticleFig(id=1210986471784321853, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图6, caption=
气隙缺陷最大场强值随线芯工作温度的变化趋势, figureFileSmall=a96Zg6Q3cjincyXb+YHAGA==, figureFileBig=e65zMPmYXiYDaqFq6uflPw==, tableContent=null), ArticleFig(id=1210986471838847806, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig.7, caption=
Electric field distribution of air gap at different interface positions under no-load, figureFileSmall=eMXYYEfiaWacohKvfd1gFw==, figureFileBig=XahNMw12ZOWC++A5Zuy1Jg==, tableContent=null), ArticleFig(id=1210986471901762367, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图7, caption=
空载下气隙缺陷处于不同界面位置时的电场分布, figureFileSmall=eMXYYEfiaWacohKvfd1gFw==, figureFileBig=XahNMw12ZOWC++A5Zuy1Jg==, tableContent=null), ArticleFig(id=1210986471960482624, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig.8, caption=
Variation trend of maximum air gap field strength with interface position, figureFileSmall=/Cm28m8eBs1O4rFFZzdlGQ==, figureFileBig=Rbiti0x00U+sr9p4m1ruLg==, tableContent=null), ArticleFig(id=1210986473881473857, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图8, caption=
气隙缺陷最大场强值随界面位置的变化趋势, figureFileSmall=/Cm28m8eBs1O4rFFZzdlGQ==, figureFileBig=Rbiti0x00U+sr9p4m1ruLg==, tableContent=null), ArticleFig(id=1210986473940194114, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig.9, caption=
Variation trend of maximum air gap field strength under different sizes, figureFileSmall=oBqgMW4yLK6fC1zyK//yYA==, figureFileBig=9/osRRfUPPD9YuGmPCWUyw==, tableContent=null), ArticleFig(id=1210986473990525763, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图9, caption=
气隙缺陷最大场强在不同尺寸下的变化趋势, figureFileSmall=oBqgMW4yLK6fC1zyK//yYA==, figureFileBig=9/osRRfUPPD9YuGmPCWUyw==, tableContent=null), ArticleFig(id=1210986474049246020, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig.10, caption=
Diurnal variation curves of cable core temperature in summer and winter, figureFileSmall=KPREFLAnlizO3Ir3CSZnmA==, figureFileBig=N2EAQYm20Pzj6ukRLNzkhA==, tableContent=null), ArticleFig(id=1210986474116354885, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图10, caption=
夏、冬季电缆线芯温度的日变化曲线, figureFileSmall=KPREFLAnlizO3Ir3CSZnmA==, figureFileBig=N2EAQYm20Pzj6ukRLNzkhA==, tableContent=null), ArticleFig(id=1210986474187658054, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig.11, caption=
Frequency histogram and probability density curve of air gap field strength, figureFileSmall=K8cApHhSiHW9DT3L56rxTQ==, figureFileBig=bJIHmHi1SDEooEkq8pPZQw==, tableContent=null), ArticleFig(id=1210986474250572615, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图11, caption=
气隙缺陷场强值的频率直方图及概率密度曲线, figureFileSmall=K8cApHhSiHW9DT3L56rxTQ==, figureFileBig=bJIHmHi1SDEooEkq8pPZQw==, tableContent=null), ArticleFig(id=1210986474305098568, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Fig.12, caption=
Variation curve of defect detection rate with the increase of applied voltage, figureFileSmall=8mQnM7b9lEbMtlFtAeV9DA==, figureFileBig=le4sQgLdFPF4JgsNPjMeWg==, tableContent=null), ArticleFig(id=1210986474372207433, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=图12, caption=
缺陷检出率随外施电压增大的变化曲线, figureFileSmall=8mQnM7b9lEbMtlFtAeV9DA==, figureFileBig=le4sQgLdFPF4JgsNPjMeWg==, tableContent=null), ArticleFig(id=1210986474426733386, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Tab.1, caption=
Parameters of cable material, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 半径/mm | 电导率/(S/m) | 相对介电常数 | 恒压热容/(J/(kg·K)) | 导热系数/(W/(m·K)) |
|---|
| 铜芯 | 24 | 5.8×107 | — | 385 | 400 |
| 导体屏蔽 | 26 | 2 | 30 | 2 182 | 0.29 |
| 交联聚乙烯 | 52 | 式(1) | 2.3 | 2 250 | 0.32 |
| 外半导电层 | 53.2 | 2 | 30 | 2 182 | 0.29 |
| 应力锥 | — | 1 | 100 | 2 182 | 0.35 |
| 硅橡胶 | 130 | 式(1) | 2.95 | 1 700 | 0.25 |
| 绝缘油 | 205 | 2×10-13 | 2.7 | 1 630 | 0.14 |
| 空气 | — | 1×10-14 | 1 | 1 000.4 | 0.025 |
), ArticleFig(id=1210986474510619467, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=表1, caption=
电缆各部分材料的参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 半径/mm | 电导率/(S/m) | 相对介电常数 | 恒压热容/(J/(kg·K)) | 导热系数/(W/(m·K)) |
|---|
| 铜芯 | 24 | 5.8×107 | — | 385 | 400 |
| 导体屏蔽 | 26 | 2 | 30 | 2 182 | 0.29 |
| 交联聚乙烯 | 52 | 式(1) | 2.3 | 2 250 | 0.32 |
| 外半导电层 | 53.2 | 2 | 30 | 2 182 | 0.29 |
| 应力锥 | — | 1 | 100 | 2 182 | 0.35 |
| 硅橡胶 | 130 | 式(1) | 2.95 | 1 700 | 0.25 |
| 绝缘油 | 205 | 2×10-13 | 2.7 | 1 630 | 0.14 |
| 空气 | — | 1×10-14 | 1 | 1 000.4 | 0.025 |
), ArticleFig(id=1210986474581922636, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Tab.2, caption=
Conductivity related parameters of cable material, figureFileSmall=null, figureFileBig=null, tableContent=
| 绝缘材料 | A/(V/(Ω·m2)) | φ/eV | B/(m/V) |
|---|
| 交联聚乙烯 | 2.69×107 | 0.916 | 1.45×10-7 |
| 硅橡胶 | 2.03×105 | 0.760 | 1.48×10-7 |
), ArticleFig(id=1210986475777299277, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=表2, caption=
绝缘材料的电导率相关参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 绝缘材料 | A/(V/(Ω·m2)) | φ/eV | B/(m/V) |
|---|
| 交联聚乙烯 | 2.69×107 | 0.916 | 1.45×10-7 |
| 硅橡胶 | 2.03×105 | 0.760 | 1.48×10-7 |
), ArticleFig(id=1210986475861185358, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Tab.3, caption=
Values of coefficients at different temperatures, figureFileSmall=null, figureFileBig=null, tableContent=
| 系数 | T/℃ |
|---|
| 30 | 40 | 60 | 70 | 90 |
|---|
| k0/(kV/cm) | 705.60 | 962 | 2059 | 6044 | 1.934×104 |
| k1/(kV/cm2) | -67.61 | -94.64 | -186.90 | -563.70 | -1 776 |
| k2/(kV/cm3) | 2.17 | 3.09 | 5.34 | 16.71 | 51.06 |
| k3/(kV/cm4) | -0.023 | -0.032 | -0.043 | -0.149 | -0.431 |
), ArticleFig(id=1210986475924099919, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=表3, caption=
各系数在不同温度下的取值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 系数 | T/℃ |
|---|
| 30 | 40 | 60 | 70 | 90 |
|---|
| k0/(kV/cm) | 705.60 | 962 | 2059 | 6044 | 1.934×104 |
| k1/(kV/cm2) | -67.61 | -94.64 | -186.90 | -563.70 | -1 776 |
| k2/(kV/cm3) | 2.17 | 3.09 | 5.34 | 16.71 | 51.06 |
| k3/(kV/cm4) | -0.023 | -0.032 | -0.043 | -0.149 | -0.431 |
), ArticleFig(id=1210986476020568912, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Tab.4, caption=
Coefficient values of formula (10), figureFileSmall=null, figureFileBig=null, tableContent=
| 系数 | i |
|---|
| 0 | 1 | 2 | 3 |
|---|
| ai | 1.021×10-6 | -1.016×10-7 | 3.427×10-9 | -3.482×10-11 |
| bi | 5.253 | 5.235 | 5.199 | 5.156 |
| ci/(kV/cm2) | 531 | -51.810 | 1.711 | -0.018 |
), ArticleFig(id=1210986476083483473, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=表4, caption=
公式(10)中的系数取值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 系数 | i |
|---|
| 0 | 1 | 2 | 3 |
|---|
| ai | 1.021×10-6 | -1.016×10-7 | 3.427×10-9 | -3.482×10-11 |
| bi | 5.253 | 5.235 | 5.199 | 5.156 |
| ci/(kV/cm2) | 531 | -51.810 | 1.711 | -0.018 |
), ArticleFig(id=1210986476138009426, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Tab.5, caption=
Coefficient valuse in formula (14), figureFileSmall=null, figureFileBig=null, tableContent=
| 系列 | j |
|---|
| 0 | 1 | 2 | 3 |
|---|
| aj | 1.13×10-35 | -5.942×10-33 | 3.977×10-31 | -6.963×10-30 |
| bj | 21.18 | 19.87 | 18.81 | 17.82 |
| cj | -3.174×10-30 | 2.396×10-27 | -1.232×10-25 | 4.555×10-24 |
| dj | 18.82 | 17.40 | 16.41 | 15.22 |
| ej | 2.194×10-24 | 8.66×10-22 | 1.201×10-19 | -5.237×10-18 |
| fj | 15.86 | 14.62 | 13.37 | 12.13 |
| pj | -2.94×10-18 | 5.301×10-15 | -1.204×10-15 | 8.213×10-12 |
| qj | 12.35 | 10.72 | 11.21 | 8.62 |
), ArticleFig(id=1210986476205118291, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=表5, caption=
公式(14)中的系数取值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 系列 | j |
|---|
| 0 | 1 | 2 | 3 |
|---|
| aj | 1.13×10-35 | -5.942×10-33 | 3.977×10-31 | -6.963×10-30 |
| bj | 21.18 | 19.87 | 18.81 | 17.82 |
| cj | -3.174×10-30 | 2.396×10-27 | -1.232×10-25 | 4.555×10-24 |
| dj | 18.82 | 17.40 | 16.41 | 15.22 |
| ej | 2.194×10-24 | 8.66×10-22 | 1.201×10-19 | -5.237×10-18 |
| fj | 15.86 | 14.62 | 13.37 | 12.13 |
| pj | -2.94×10-18 | 5.301×10-15 | -1.204×10-15 | 8.213×10-12 |
| qj | 12.35 | 10.72 | 11.21 | 8.62 |
), ArticleFig(id=1210986476259644244, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=EN, label=Tab.6, caption=
Coefficient valuse in formula (15), figureFileSmall=null, figureFileBig=null, tableContent=
| 系数 | i |
|---|
| 0 | 1 | 2 | 3 | 4 |
|---|
| ai | 1.021×10-6 | -1.016×10-7 | 3.427×10-9 | -3.482×10-11 | 1.303×106 |
| bi | 5.253 | 5.235 | 5.199 | 5.156 | -6.999 |
| ci | 531 | -51.810 | 1.711 | -0.018 | -0.079 |
), ArticleFig(id=1210986476335141717, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1198665391607214960, language=CN, label=表6, caption=
式(15)中的系数取值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 系数 | i |
|---|
| 0 | 1 | 2 | 3 | 4 |
|---|
| ai | 1.021×10-6 | -1.016×10-7 | 3.427×10-9 | -3.482×10-11 | 1.303×106 |
| bi | 5.253 | 5.235 | 5.199 | 5.156 | -6.999 |
| ci | 531 | -51.810 | 1.711 | -0.018 | -0.079 |
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