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This paper introduces the analysis process of a 500 kV substation DC system inter-pole short circuit fault. In order to deeply explore this special kind of DC insulation fault, based on the balance bridge principle of the DC insulation monitor, a circuit model of the DC inter-pole short circuit is established, and the process of obtaining the short circuit resistance of mutual short circuit is given. By calculating and analyzing the relationship between the control bus voltage and the short circuit resistance during DC inter-pole short circuit, the characteristics of DC inter-pole short circuit are summarized to provide reference for handling similar DC system faults.
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本文介绍了一起500 kV变电站直流系统异极窜电故障的分析过程。为了深入探讨这类特殊直流绝缘故障,根据直流绝缘监测仪的平衡桥原理,建立直流异极窜电电路模型,给出互窜短接电阻的求取过程。通过计算并分析直流异极窜电时控制母线电压与短接电阻的关系,归纳直流异极窜电的特征,以期为处理类似直流系统故障提供参考。
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祝石厚(1982—),男,硕士,高级工程师,主要从事500 kV继电保护与综合自动化检修技术管理工作。
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祝石厚(1982—),男,硕士,高级工程师,主要从事500 kV继电保护与综合自动化检修技术管理工作。
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祝石厚(1982—),男,硕士,高级工程师,主要从事500 kV继电保护与综合自动化检修技术管理工作。
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25(8): 81-84., articleTitle=某500 kV变电站直流接地叠加多点窜电故障分析, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1190372722627674251, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, xref=null, ext=[AuthorCompanyExt(id=1190372722636062860, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, companyId=1190372722627674251, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=State Grid Zhejiang Electric Power Co., Ltd Shaoxing Power Supply Company, Shaoxing, Zhejiang 312000), AuthorCompanyExt(id=1190372722648645773, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, companyId=1190372722627674251, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=国网浙江省电力有限公司绍兴供电公司,浙江 绍兴 312000)])], figs=[ArticleFig(id=1190372723844022432, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=EN, label=null, caption=null, figureFileSmall=elGW3nHnwQs7RjoDsT3Ejg==, figureFileBig=SDj0Zt/RezodS78sSmXiGw==, tableContent=null), ArticleFig(id=1190372723911131297, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=CN, label=图1, caption=
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直流异极窜电等效电路模型, figureFileSmall=9Qy7ceBP2YEtvSM7ynye8Q==, figureFileBig=ThAMbmq5wWpGMWa964c/Wg==, tableContent=null), ArticleFig(id=1190372724733214890, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=EN, label=null, caption=null, figureFileSmall=yxOsb4J3w5sbYC1T8K6zPA==, figureFileBig=5NHOBhG0rYNcvpJfvMKDbw==, tableContent=null), ArticleFig(id=1190372724817100971, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=CN, label=图6, caption=
化简后的等效电路模型, figureFileSmall=yxOsb4J3w5sbYC1T8K6zPA==, figureFileBig=5NHOBhG0rYNcvpJfvMKDbw==, tableContent=null), ArticleFig(id=1190372724926152876, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=EN, label=null, caption=null, figureFileSmall=AcpH0n8VwxFKaqAndTh9kQ==, figureFileBig=1Oeg6HVqYyGeRMJvqZN/uw==, tableContent=null), ArticleFig(id=1190372725060370605, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=CN, label=图7, caption=
断开绝缘巡检仪1平衡电阻的等效电路, figureFileSmall=AcpH0n8VwxFKaqAndTh9kQ==, figureFileBig=1Oeg6HVqYyGeRMJvqZN/uw==, tableContent=null), ArticleFig(id=1190372725131673774, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=EN, label=null, caption=null, figureFileSmall=Kq0wZ7y+pCJTjTcIwpk98g==, figureFileBig=BXTU98uNPCwYff+MsW/hXQ==, tableContent=null), ArticleFig(id=1190372725295251631, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=CN, label=图8, caption=
SF6表计B11触点短接示意图, figureFileSmall=Kq0wZ7y+pCJTjTcIwpk98g==, figureFileBig=BXTU98uNPCwYff+MsW/hXQ==, tableContent=null), ArticleFig(id=1190372725374943408, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 母线 | 极性 | 母线 电压/V | 对地绝缘 电阻/kΩ | 电压偏移 系数 |
| Ⅰ段 | 正极 | 107.1 | 999.9 | 1.84 |
| 负极 | -8.8 | 4.3 | 0.15 |
| Ⅱ段 | 正极 | 5.9 | 3.0 | 0.10 |
| 负极 | -109.5 | 999.9 | 1.88 |
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直流绝缘监测仪告警信息
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| 母线 | 极性 | 母线 电压/V | 对地绝缘 电阻/kΩ | 电压偏移 系数 |
| Ⅰ段 | 正极 | 107.1 | 999.9 | 1.84 |
| 负极 | -8.8 | 4.3 | 0.15 |
| Ⅱ段 | 正极 | 5.9 | 3.0 | 0.10 |
| 负极 | -109.5 | 999.9 | 1.88 |
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| 母线 | 极性 | 监测值/V | 实测值/V | 计算值/V |
| Ⅰ段 | 正极 | 107.1 | 108.2 | 112.1 |
| 负极 | -8.8 | -7.8 | -3.8 |
| Ⅱ段 | 正极 | 5.9 | 5.9 | 3.6 |
| 负极 | -109.5 | -109.5 | -111.9 |
), ArticleFig(id=1190372725681127603, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=CN, label=表2, caption=
母线电压监测值、实测值与计算值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 母线 | 极性 | 监测值/V | 实测值/V | 计算值/V |
| Ⅰ段 | 正极 | 107.1 | 108.2 | 112.1 |
| 负极 | -8.8 | -7.8 | -3.8 |
| Ⅱ段 | 正极 | 5.9 | 5.9 | 3.6 |
| 负极 | -109.5 | -109.5 | -111.9 |
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| 短接电阻/kΩ | Ⅰ段正极 电压/V | Ⅰ段负极 电压/V | Ⅱ段正极 电压/V | Ⅱ段负极 电压/V |
| 0 | 110.0 | 0 | 0 | -110.0 |
| 6.8(0.1RS) | 105.0 | -5.0 | 5.0 | -105.0 |
| 13.6(0.2RS) | 100.8 | -9.2 | 9.2 | -100.8 |
| 34.0(0.5RS) | 91.6 | -18.4 | 18.4 | -91.6 |
| 68.0(RS) | 82.5 | -27.5 | 27.5 | -82.5 |
| 680.0(10RS) | 59.8 | -50.2 | 50.2 | -59.8 |
| ∞ | 55.0 | -55.0 | 55.0 | -55.0 |
), ArticleFig(id=1190372725861482677, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1190338918781386983, language=CN, label=表3, caption=
控制母线电压与短接电阻关系
, figureFileSmall=null, figureFileBig=null, tableContent=
| 短接电阻/kΩ | Ⅰ段正极 电压/V | Ⅰ段负极 电压/V | Ⅱ段正极 电压/V | Ⅱ段负极 电压/V |
| 0 | 110.0 | 0 | 0 | -110.0 |
| 6.8(0.1RS) | 105.0 | -5.0 | 5.0 | -105.0 |
| 13.6(0.2RS) | 100.8 | -9.2 | 9.2 | -100.8 |
| 34.0(0.5RS) | 91.6 | -18.4 | 18.4 | -91.6 |
| 68.0(RS) | 82.5 | -27.5 | 27.5 | -82.5 |
| 680.0(10RS) | 59.8 | -50.2 | 50.2 | -59.8 |
| ∞ | 55.0 | -55.0 | 55.0 | -55.0 |
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