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In order to explore the influence of high voltage cable oil filled terminal grounding system defects such as lack of copper net and lead seal defects of on the voltage and current of oil filled terminal, we built an RLC equivalent model of oil filled terminal. On the basis of capacitance parameters and test parameters computed by COMSOL, the change of terminal voltage and current characteristic under the defects was analyzed, and then it was verified by actual fault cases. The results show that the loss of copper net leads to the grounding failure of the outer semi-conductive layer, and the voltage of the outer semi-conductive layer increases significantly, results in the discharge. The lead seal fracture leads to the unreliability of the connection between the aluminum sheath and the tail pipe, results in the voltage suspension of terminal aluminum sheath, and causes the discharge between the aluminum sheath and the buffer layer under long-term operation. Defects between the lead seals reduce the contact area between the aluminum sheath and the lead seal, the minimum allowable contact area at the lead seal is about 10%.
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为探究高压电缆充油终端铜网缺失和铅封缺陷等接地系统缺陷对终端电压和电流的影响,利用集中参数电路,建立电缆充油终端电阻电感电容(RLC)等效模型,基于COMSOL计算终端电容参数以及实验测试电阻参数,分析缺陷下终端电压和电流的变化特征,并通过实际故障案例加以验证。结果表明:铜网缺失导致终端外半导电层接地失效,外半导电层电压显著增大,进而引起放电;铅封断裂导致铝护套与尾管连接不可靠,造成终端铝护套电压悬浮,长期运行会造成铝护套与缓冲层间放电;铅封层间缺陷导致铝护套与铅封接触面积减小,铅封处允许的最小接触面积约为10%。
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方春华(1980-),男(汉族),湖北天门人,副教授,主要从事高电压绝缘与在线检测技术方面的研究。
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1Hubei Provincial Engineering Technology Research Center for Power Transmission Line, Yichang 443002, China
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1湖北省输电线路工程技术研究中心,湖北 宜昌 443002
2三峡大学 电气与新能源学院, 湖北 宜昌 443002, bio={"content":"
方春华(1980-),男(汉族),湖北天门人,副教授,主要从事高电压绝缘与在线检测技术方面的研究。
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方春华(1980-),男(汉族),湖北天门人,副教授,主要从事高电压绝缘与在线检测技术方面的研究。
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3Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210008, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1210905924210922136, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, authorId=1210905924026372749, language=CN, stringName=陈杰, firstName=杰, middleName=null, lastName=陈, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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3国家电网江苏电力有限公司电力科学研究院,江苏 南京 210008, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1210905922768081472, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, xref=3, ext=[AuthorCompanyExt(id=1210905922776470081, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, companyId=1210905922768081472, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210008, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1210905924563243694, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, authorId=1210905924311585439, language=CN, stringName=曹京荥, firstName=京荥, middleName=null, lastName=曹, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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3国家电网江苏电力有限公司电力科学研究院,江苏 南京 210008, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1210905922768081472, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, xref=3, ext=[AuthorCompanyExt(id=1210905922776470081, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, companyId=1210905922768081472, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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充油终端等效电路模型, figureFileSmall=nImX3vosluTZ+s4fvkqr5A==, figureFileBig=zQ6AR7YY7WkwQRPL5teWAQ==, tableContent=null), ArticleFig(id=1210905926022861582, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.3, caption=
Equivalent circuit for circulating sheath induced current, figureFileSmall=YlX6CTbII7vLcRkRiMn+Ig==, figureFileBig=uLvuziKqPE1OBv+Cfe37Tw==, tableContent=null), ArticleFig(id=1210905926127719191, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图3, caption=
护层感应电流计算等效电路, figureFileSmall=YlX6CTbII7vLcRkRiMn+Ig==, figureFileBig=uLvuziKqPE1OBv+Cfe37Tw==, tableContent=null), ArticleFig(id=1210905926194828063, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.4, caption=
Capacitance current diagram, figureFileSmall=2KrCcOgdx7YaUq2Y5SOxIg==, figureFileBig=gTAyGhtE+X0EomVQm0Wf/g==, tableContent=null), ArticleFig(id=1210905926287102757, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图4, caption=
电容电流示意图, figureFileSmall=2KrCcOgdx7YaUq2Y5SOxIg==, figureFileBig=gTAyGhtE+X0EomVQm0Wf/g==, tableContent=null), ArticleFig(id=1210905926370988843, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.5, caption=
The parameter calculation model of the oil filled terminal, figureFileSmall=xk8be5YtMB4uV/0q2YcAgg==, figureFileBig=S1T0cucU0mjA9Wh9uB8I4A==, tableContent=null), ArticleFig(id=1210905926446486321, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图5, caption=
充油终端参数计算模型, figureFileSmall=xk8be5YtMB4uV/0q2YcAgg==, figureFileBig=S1T0cucU0mjA9Wh9uB8I4A==, tableContent=null), ArticleFig(id=1210905926534566710, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.6, caption=
Voltage waveform of semi-conducting layer outside terminal, figureFileSmall=dTw+d1vX9GGydvZK9YUsaw==, figureFileBig=hAtzNDk54E2AXG4oygLLAQ==, tableContent=null), ArticleFig(id=1210905926698144576, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图6, caption=
终端外半导电层电压波形图, figureFileSmall=dTw+d1vX9GGydvZK9YUsaw==, figureFileBig=hAtzNDk54E2AXG4oygLLAQ==, tableContent=null), ArticleFig(id=1210905926815585098, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.7, caption=
Terminal voltage and current waveforms, figureFileSmall=PBvwzNATWlnflcWogX5eKQ==, figureFileBig=RpWUnU+rDQKYXXlB4aFHwg==, tableContent=null), ArticleFig(id=1210905926912054095, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图7, caption=
终端电压和电流波形图, figureFileSmall=PBvwzNATWlnflcWogX5eKQ==, figureFileBig=RpWUnU+rDQKYXXlB4aFHwg==, tableContent=null), ArticleFig(id=1210905927016911704, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.8, caption=
Variation of terminal voltage and current, figureFileSmall=L4dvKD8t+C/icTfx4fh4oA==, figureFileBig=HEAs5ZL4CZniQP1JyXYm0g==, tableContent=null), ArticleFig(id=1210905927125963613, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图8, caption=
终端电压和电流变化规律, figureFileSmall=L4dvKD8t+C/icTfx4fh4oA==, figureFileBig=HEAs5ZL4CZniQP1JyXYm0g==, tableContent=null), ArticleFig(id=1210905927205655395, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.9, caption=
Diagram of the relationship between the minimum contact area proportion and sheath current, figureFileSmall=tmUCLOwrxyFYbyd39Zf2VQ==, figureFileBig=xAJc91SZqRel9FYExrT3oQ==, tableContent=null), ArticleFig(id=1210905927356650347, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图9, caption=
允许的最小接触面积占比与护层电流关系图, figureFileSmall=tmUCLOwrxyFYbyd39Zf2VQ==, figureFileBig=xAJc91SZqRel9FYExrT3oQ==, tableContent=null), ArticleFig(id=1210905927440536434, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.10, caption=
The design of actual cable line, figureFileSmall=MbU4bF/NpqEDR2lUN4NNAg==, figureFileBig=eU7+fI/EB1zePAbOMa2CPw==, tableContent=null), ArticleFig(id=1210905927557976951, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图10, caption=
实际线路设计, figureFileSmall=MbU4bF/NpqEDR2lUN4NNAg==, figureFileBig=eU7+fI/EB1zePAbOMa2CPw==, tableContent=null), ArticleFig(id=1210905927658640256, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Fig.11, caption=
B - phase fault breakdown point, figureFileSmall=7xZEbl3udmhEUqCKR6SAaQ==, figureFileBig=Do4+wAlvtnAe4OoAY4A2uQ==, tableContent=null), ArticleFig(id=1210905927755109254, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=图11, caption=
B相故障击穿点, figureFileSmall=7xZEbl3udmhEUqCKR6SAaQ==, figureFileBig=Do4+wAlvtnAe4OoAY4A2uQ==, tableContent=null), ArticleFig(id=1210905927855772556, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Tab.1, caption=
Defect type of oil filled terminal, figureFileSmall=null, figureFileBig=null, tableContent=
| 序号 | 缺陷类型 | 具体缺陷名称 |
|---|
| 1 | 铜网缺失 | I段铜网缺失 |
| 2 | II段铜网缺失 |
| 3 | 铅封缺陷 | 铝护套-尾管连接处断裂缺陷 |
| 4 | 铅封-铝护套界面层间缺陷 |
), ArticleFig(id=1210905927931270037, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=表1, caption=
充油终端缺陷类型
, figureFileSmall=null, figureFileBig=null, tableContent=
| 序号 | 缺陷类型 | 具体缺陷名称 |
|---|
| 1 | 铜网缺失 | I段铜网缺失 |
| 2 | II段铜网缺失 |
| 3 | 铅封缺陷 | 铝护套-尾管连接处断裂缺陷 |
| 4 | 铅封-铝护套界面层间缺陷 |
), ArticleFig(id=1210905928010961816, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Tab.2, caption=
110 kV single core cable parameters, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
|---|
| 导体横截面积/mm2 | 1 000 |
| 导体半径/mm | 20.20 |
| 绝缘层厚度/mm | 16 |
| 几何半径/mm | 50.65 |
| 铝护套厚度/mm | 1.80 |
| 外护套厚度/mm | 3 |
), ArticleFig(id=1210905928094847901, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=表2, caption=
110 kV单芯电缆参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
|---|
| 导体横截面积/mm2 | 1 000 |
| 导体半径/mm | 20.20 |
| 绝缘层厚度/mm | 16 |
| 几何半径/mm | 50.65 |
| 铝护套厚度/mm | 1.80 |
| 外护套厚度/mm | 3 |
), ArticleFig(id=1210905928182928290, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Tab.3, caption=
Basic parameters of terminal structure, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 介电常数 | 外半径/mm | 内半径/mm | 电阻率/(Ω·m) |
|---|
| 内半导电层 | 100 | 23.10 | 21.30 | 0.5 |
| 绝缘层 | 2.25 | 47.10 | 23.10 | 1×1015 |
| 外半导电层 | 3 | 48.10 | 47.10 | 1×1015 |
| 绝缘油 | 2.63 | 97.73 | 48.10 | 1×1012 |
| 空气 | 1 | 52.93 | 48.10 | 1×1014 |
), ArticleFig(id=1210905928237454246, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=表3, caption=
终端各结构的基本参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 介电常数 | 外半径/mm | 内半径/mm | 电阻率/(Ω·m) |
|---|
| 内半导电层 | 100 | 23.10 | 21.30 | 0.5 |
| 绝缘层 | 2.25 | 47.10 | 23.10 | 1×1015 |
| 外半导电层 | 3 | 48.10 | 47.10 | 1×1015 |
| 绝缘油 | 2.63 | 97.73 | 48.10 | 1×1012 |
| 空气 | 1 | 52.93 | 48.10 | 1×1014 |
), ArticleFig(id=1210905928329728939, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Tab.4, caption=
Simulation results, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 电容值/pF |
|---|
| C1 | 32.36 |
| C2 | 81.63 |
| C外护套 | 212.13 |
| C杂 | 31.83 |
), ArticleFig(id=1210905928405226419, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=表4, caption=
仿真计算结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 电容值/pF |
|---|
| C1 | 32.36 |
| C2 | 81.63 |
| C外护套 | 212.13 |
| C杂 | 31.83 |
), ArticleFig(id=1210905928476529591, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Tab.5, caption=
The test result, figureFileSmall=null, figureFileBig=null, tableContent=
| 试验样品 | 长度/m | 电阻/kΩ | 每米平均电阻/kΩ |
|---|
| 样品1 | 0.45 | 2.09 | 4.6 |
| 样品2 | 0.50 | 1.58 | 3.2 |
| 样品3 | 0.60 | 1.67 | 2.8 |
| 样品4 | 0.40 | 2.65 | 6.6 |
), ArticleFig(id=1210905928572998589, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=表5, caption=
测试结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试验样品 | 长度/m | 电阻/kΩ | 每米平均电阻/kΩ |
|---|
| 样品1 | 0.45 | 2.09 | 4.6 |
| 样品2 | 0.50 | 1.58 | 3.2 |
| 样品3 | 0.60 | 1.67 | 2.8 |
| 样品4 | 0.40 | 2.65 | 6.6 |
), ArticleFig(id=1210905928673661892, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Tab.6, caption=
Basic parameters of cable seal, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
|---|
| 铝护套外半径/m | 0.041 2 |
| 铅封沿轴向的长度/m | 0.14 |
| 铅封材料的散热系数/(W/(m2·K)) | 46.07 |
| 铅封材料的电阻率/(Ω·m) | 17.29 |
| 铅封处允许温升/℃ | 40 |
), ArticleFig(id=1210905928757547981, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=表6, caption=
电缆铅封的基本参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
|---|
| 铝护套外半径/m | 0.041 2 |
| 铅封沿轴向的长度/m | 0.14 |
| 铅封材料的散热系数/(W/(m2·K)) | 46.07 |
| 铅封材料的电阻率/(Ω·m) | 17.29 |
| 铅封处允许温升/℃ | 40 |
), ArticleFig(id=1210905928837239759, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Tab.7, caption=
Voltage and current characteristics under fault, figureFileSmall=null, figureFileBig=null, tableContent=
| 故障类型 | 电压和电流特征 |
|---|
| 铜网缺失 | ①无铜网缺失时,终端外半导电层电压均为0 V; ②I、II段铜网缺失分别导致终端外半导电层电压达到1.06 kV、2.31 kV; ③两处铜网缺失均会引起放电。 |
| 铅封断裂缺陷 | ①严重铅封断裂缺陷导致终端铝护套电压悬浮,高达5.12 kV; ②随缺陷严重程度增加,铝护套电压增大,法兰接地电流减小。 |
| 铅封层间缺陷 | ①随护层电流增大,铅封层间缺陷允许的最小接触面积增大; ②正常工况下,铅封处允许的最小接触面积为10%。 |
), ArticleFig(id=1210905928950485974, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=表7, caption=
故障下的电压和电流特征
, figureFileSmall=null, figureFileBig=null, tableContent=
| 故障类型 | 电压和电流特征 |
|---|
| 铜网缺失 | ①无铜网缺失时,终端外半导电层电压均为0 V; ②I、II段铜网缺失分别导致终端外半导电层电压达到1.06 kV、2.31 kV; ③两处铜网缺失均会引起放电。 |
| 铅封断裂缺陷 | ①严重铅封断裂缺陷导致终端铝护套电压悬浮,高达5.12 kV; ②随缺陷严重程度增加,铝护套电压增大,法兰接地电流减小。 |
| 铅封层间缺陷 | ①随护层电流增大,铅封层间缺陷允许的最小接触面积增大; ②正常工况下,铅封处允许的最小接触面积为10%。 |
), ArticleFig(id=1210905929042760664, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=EN, label=Tab.8, caption=
Physical and chemical test results, figureFileSmall=null, figureFileBig=null, tableContent=
| 检测项目 | GB/T 11017.1—2014要求 | 检测结果 | 检测结论 |
|---|
| 绝缘最小厚度/mm | ≥14.85 | 16.65 | 合格 |
| 绝缘偏心度/% | ≤12 | 2 | 合格 |
| 绝缘抗张强度/MPa | ≥12.5 | 23.75 | 合格 |
| 绝缘断裂伸长率/% | ≥200 | 557.46 | 合格 |
| 绝缘热延伸 | 负荷下最大伸长率/% | ≤175 | 75 | 合格 |
| 冷却后最大永久伸长率/% | ≤15 | 1.8 | 合格 |
), ArticleFig(id=1210905929147618271, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1209857946238972064, language=CN, label=表8, caption=
理化检测结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 检测项目 | GB/T 11017.1—2014要求 | 检测结果 | 检测结论 |
|---|
| 绝缘最小厚度/mm | ≥14.85 | 16.65 | 合格 |
| 绝缘偏心度/% | ≤12 | 2 | 合格 |
| 绝缘抗张强度/MPa | ≥12.5 | 23.75 | 合格 |
| 绝缘断裂伸长率/% | ≥200 | 557.46 | 合格 |
| 绝缘热延伸 | 负荷下最大伸长率/% | ≤175 | 75 | 合格 |
| 冷却后最大永久伸长率/% | ≤15 | 1.8 | 合格 |
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