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In recent years, ablation failure of high-voltage cable buffer layer occurs frequently. In order to solve the problem, this paper established a simulation model for XLPE cables and studied the electric field distribution characteristics of buffer layers under different resistivity. Based on the fault mechanism, a buffer layer repair scheme and a full set of on-site repair process were proposed. Repair tests were conducted on 220 kV high-voltage cross-linked polyethylene fault cables with a length of 1.2 m and 6 m, respectively. The repair effect was evaluated from the perspectives of contact resistance and capacitance current. The results show that with the increase of volume resistivity of the buffer layer, the electric field distortion between the buffer layer and the aluminum sheath is serious, which is easy to cause partial discharge and lead to cable failure. With the decrease of volume resistivity of the buffer layer, the electrical connection between the buffer layer and the aluminum sheath gradually recovers, and the electric field distribution tends to be uniform. After the injection of conductive repair medium, the resistance between the buffer layer and the aluminum sheath decreases by 41.67%, indicating that the electrical connection performance between the buffer layer and the aluminum sheath has been restored.
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近年来,高压电缆缓冲层烧蚀故障频发,为解决这一问题,本研究建立XLPE电缆仿真模型,研究不同电阻率下缓冲层的电场分布特性;基于故障机理提出了缓冲层修复方案与全套现场修复工艺,分别对长度为1.2 m和6 m的220 kV高压交联聚乙烯故障电缆进行修复试验,并从接触电阻与电容电流两个角度对修复效果进行评价。结果表明:随着缓冲层体积电阻率的升高,缓冲层与铝护套之间电场畸变严重,极易引发局部放电,从而引起电缆故障;而随着缓冲层体积电阻率的下降,缓冲层与铝护套间的电气连接逐渐恢复,电场分布趋于均匀。注入导电修复介质后,缓冲层与铝护套之间的电阻下降幅度可达41.67%,表明缓冲层与铝护套电气连接性能得到恢复。
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Simulation model of 220 kV XLPE cable, figureFileSmall=6BGGjGIjs+p1grnYggVeqg==, figureFileBig=7KuJ9HtopLr88cJUKqkWhw==, tableContent=null), ArticleFig(id=1211296914394452802, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图1, caption=
220 kV XLPE电缆仿真模型, figureFileSmall=6BGGjGIjs+p1grnYggVeqg==, figureFileBig=7KuJ9HtopLr88cJUKqkWhw==, tableContent=null), ArticleFig(id=1211296914528670537, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.2, caption=
Simulation diagram of electric field distribution in buffer layer with different volume resisitivity, figureFileSmall=jvecjhVxge4uuWDVNHKRNw==, figureFileBig=UiS6beDu2pPKHW30HyZrQQ==, tableContent=null), ArticleFig(id=1211296914604168014, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图2, caption=
不同体积电阻率下缓冲层电场分布仿真图, figureFileSmall=jvecjhVxge4uuWDVNHKRNw==, figureFileBig=UiS6beDu2pPKHW30HyZrQQ==, tableContent=null), ArticleFig(id=1211296914709025620, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.3, caption=
Maximum electric field intensity in buffer layer with different volume resisitivity, figureFileSmall=Uwgat6943CwGP2ASRC5tag==, figureFileBig=vk5TX5cyTQCgtYY+Hwc/ng==, tableContent=null), ArticleFig(id=1211296914830660440, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图3, caption=
不同体积电阻率下缓冲层内最高电场强度, figureFileSmall=Uwgat6943CwGP2ASRC5tag==, figureFileBig=vk5TX5cyTQCgtYY+Hwc/ng==, tableContent=null), ArticleFig(id=1211296914973266781, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.4, caption=
Schematic diagram of repair process, figureFileSmall=DiCw6Y+cziUgmZla3Q2Swg==, figureFileBig=+J+jMOsreQHHH0lV6EZsJQ==, tableContent=null), ArticleFig(id=1211296915103290211, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图4, caption=
修复流程示意图, figureFileSmall=DiCw6Y+cziUgmZla3Q2Swg==, figureFileBig=+J+jMOsreQHHH0lV6EZsJQ==, tableContent=null), ArticleFig(id=1211296915174593381, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.5, caption=
Schematic diagram of cable fixing, figureFileSmall=CBTOMIOW6o1+8ef0rhOxVQ==, figureFileBig=rruEe70mYgq+YU/shuX1ew==, tableContent=null), ArticleFig(id=1211296915262673769, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图5, caption=
电缆固定示意图, figureFileSmall=CBTOMIOW6o1+8ef0rhOxVQ==, figureFileBig=rruEe70mYgq+YU/shuX1ew==, tableContent=null), ArticleFig(id=1211296915346559854, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.6, caption=
Schematic diagram of outer sheath removal process, figureFileSmall=v3S7gz5y2X4xixGBwmvDkg==, figureFileBig=ZI281e5CMQ2NepxrWoEMbQ==, tableContent=null), ArticleFig(id=1211296915459806065, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图6, caption=
外护套去除过程示意图, figureFileSmall=v3S7gz5y2X4xixGBwmvDkg==, figureFileBig=ZI281e5CMQ2NepxrWoEMbQ==, tableContent=null), ArticleFig(id=1211296915522720629, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.7, caption=
Schematic diagram of trepaning on aluminum sheath, figureFileSmall=6yJxrMFpj/9JAOqmxo2Nmw==, figureFileBig=qkwDVFase0ann/AX6N+SOw==, tableContent=null), ArticleFig(id=1211296915606606713, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图7, caption=
铝护套开孔过程示意图, figureFileSmall=6yJxrMFpj/9JAOqmxo2Nmw==, figureFileBig=qkwDVFase0ann/AX6N+SOw==, tableContent=null), ArticleFig(id=1211296915682104188, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.8, caption=
Schematic diagram of connection hole tapping process, figureFileSmall=vKdseRjBw3fQV6eta/WPyg==, figureFileBig=El/Qji0Ffvqs60BaiWikdA==, tableContent=null), ArticleFig(id=1211296915774378880, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图8, caption=
连接孔攻丝过程示意图, figureFileSmall=vKdseRjBw3fQV6eta/WPyg==, figureFileBig=El/Qji0Ffvqs60BaiWikdA==, tableContent=null), ArticleFig(id=1211296915858264965, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.9, caption=
Schematic diagram of repair device and connection, figureFileSmall=1IBdAZo1eve1/paOVbVP2w==, figureFileBig=YUqK9brhVaWo1UzjFDOFBQ==, tableContent=null), ArticleFig(id=1211296917070418823, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图9, caption=
修复装置及连接示意图, figureFileSmall=1IBdAZo1eve1/paOVbVP2w==, figureFileBig=YUqK9brhVaWo1UzjFDOFBQ==, tableContent=null), ArticleFig(id=1211296917171082123, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.10, caption=
Schematic diagram of injection repair process, figureFileSmall=f3GYLpczRit1eJLzvDaJ6Q==, figureFileBig=J8ZnqcbpJCknLfzUioJnZw==, tableContent=null), ArticleFig(id=1211296917326271375, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图10, caption=
注入修复过程示意图, figureFileSmall=f3GYLpczRit1eJLzvDaJ6Q==, figureFileBig=J8ZnqcbpJCknLfzUioJnZw==, tableContent=null), ArticleFig(id=1211296917422740367, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.11, caption=
Schematic diagram of repair process of cable aluminum sheath, figureFileSmall=TWKEoncerGMu4BrRWYgL1g==, figureFileBig=98LFTTIP6o3+KfIG/GTIXg==, tableContent=null), ArticleFig(id=1211296917531792276, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图11, caption=
电缆铝护套修复示意图, figureFileSmall=TWKEoncerGMu4BrRWYgL1g==, figureFileBig=98LFTTIP6o3+KfIG/GTIXg==, tableContent=null), ArticleFig(id=1211296917640844183, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.12, caption=
Schematic diagram of cable outer sheath repair effect, figureFileSmall=XyIbMW4h67mNOGRwpzry2g==, figureFileBig=Khdf8L7YyUCcOlRJV1+nEg==, tableContent=null), ArticleFig(id=1211296917724730266, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图12, caption=
电缆外护套修复效果图, figureFileSmall=XyIbMW4h67mNOGRwpzry2g==, figureFileBig=Khdf8L7YyUCcOlRJV1+nEg==, tableContent=null), ArticleFig(id=1211296917825393565, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.13, caption=
Schematic diagram of outer sheath removal process optimization, figureFileSmall=B9XBAJMAxuxkvb2wrMiqHg==, figureFileBig=aT4OBh/mAZ0tI1Q1n+pgPw==, tableContent=null), ArticleFig(id=1211296917888308125, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图13, caption=
外护套去除工艺优化, figureFileSmall=B9XBAJMAxuxkvb2wrMiqHg==, figureFileBig=aT4OBh/mAZ0tI1Q1n+pgPw==, tableContent=null), ArticleFig(id=1211296917955416993, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.14, caption=
Distributed parameter circuit model between cable buffer layer and aluminum sheath, figureFileSmall=XvxJ+Ii0snUEZU8mOtKEiw==, figureFileBig=f2tV4Pm8LhjGvleRztYSow==, tableContent=null), ArticleFig(id=1211296918043497381, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图14, caption=
电缆缓冲层与铝护套间分布参数电路模型, figureFileSmall=XvxJ+Ii0snUEZU8mOtKEiw==, figureFileBig=f2tV4Pm8LhjGvleRztYSow==, tableContent=null), ArticleFig(id=1211296918135772073, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.15, caption=
Schematic diagram of contact resistance measurement of cable buffer layer, figureFileSmall=GREZH2cz16vM+pQEagarBQ==, figureFileBig=1fuaXRDlmxrJ9LWmmvSjHw==, tableContent=null), ArticleFig(id=1211296918219658156, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图15, caption=
电缆缓冲层接触电阻测量示意图, figureFileSmall=GREZH2cz16vM+pQEagarBQ==, figureFileBig=1fuaXRDlmxrJ9LWmmvSjHw==, tableContent=null), ArticleFig(id=1211296918303544240, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.16, caption=
Equivalent circuit diagram, figureFileSmall=NyRLyi2nWJUPMi3B/0ezEw==, figureFileBig=CtLrOL4cla+ix/auFAtJ+g==, tableContent=null), ArticleFig(id=1211296918395818932, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图16, caption=
等效电路图, figureFileSmall=NyRLyi2nWJUPMi3B/0ezEw==, figureFileBig=CtLrOL4cla+ix/auFAtJ+g==, tableContent=null), ArticleFig(id=1211296918479705016, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.17, caption=
Capacitance current waveform (voltage signal) before repair, figureFileSmall=oug6O1HkCgK+ivGM5H65Nw==, figureFileBig=i7v29T0qbmDeGzvd0DQHhg==, tableContent=null), ArticleFig(id=1211296918563591098, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图17, caption=
修复前电容电流波形(电压信号), figureFileSmall=oug6O1HkCgK+ivGM5H65Nw==, figureFileBig=i7v29T0qbmDeGzvd0DQHhg==, tableContent=null), ArticleFig(id=1211296918634894268, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Fig.18, caption=
Capacitance current waveform (voltage signal) after repair, figureFileSmall=hqxQRlY+cR2Hp+GLjn3tcg==, figureFileBig=3xz/0q/6q9uv6ikmtq5S7w==, tableContent=null), ArticleFig(id=1211296918722974656, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=图18, caption=
修复后电容电流波形(电压信号), figureFileSmall=hqxQRlY+cR2Hp+GLjn3tcg==, figureFileBig=3xz/0q/6q9uv6ikmtq5S7w==, tableContent=null), ArticleFig(id=1211296918790083524, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Tab.1, caption=
Characteristic parameters of XLPE cable material, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构 | 电阻率/(Ω·cm) | 相对介电常数 |
|---|
| 铜导体 | 1.67×10-6 | 10 000 |
| 导体屏蔽层 | 100 | 500 |
| XLPE | 1×1017 | 2.3 |
| 绝缘屏蔽层 | 100 | 500 |
| 阻水带 | — | 200 |
| 空气 | 1×1016 | 1 |
| 铝护套 | 2.82×10-6 | 5 000 |
), ArticleFig(id=1211296918873969607, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=表1, caption=
220 kV XLPE电缆材料特征参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构 | 电阻率/(Ω·cm) | 相对介电常数 |
|---|
| 铜导体 | 1.67×10-6 | 10 000 |
| 导体屏蔽层 | 100 | 500 |
| XLPE | 1×1017 | 2.3 |
| 绝缘屏蔽层 | 100 | 500 |
| 阻水带 | — | 200 |
| 空气 | 1×1016 | 1 |
| 铝护套 | 2.82×10-6 | 5 000 |
), ArticleFig(id=1211296918970438603, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=EN, label=Tab.2, caption=
Measurement results of contact resistance of cable buffer layer before and after repair kΩ, figureFileSmall=null, figureFileBig=null, tableContent=
| 状态 | 有标签一侧 | 无标签一侧 |
|---|
| 缓冲层修复前 | 0.95 | 1.25 |
| 缓冲层修复后 | 0.36 | 0.70 |
), ArticleFig(id=1211296919058518993, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199642606868201597, language=CN, label=表2, caption=
修复前后电缆缓冲层接触电阻测量结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 状态 | 有标签一侧 | 无标签一侧 |
|---|
| 缓冲层修复前 | 0.95 | 1.25 |
| 缓冲层修复后 | 0.36 | 0.70 |
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