Article(id=1202649045840916634, tenantId=1146029695717560320, journalId=1190235702286704641, issueId=1202649045064970391, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1733241600000, receivedDateStr=2024-12-04, revisedDate=1734364800000, revisedDateStr=2024-12-17, acceptedDate=null, acceptedDateStr=null, onlineDate=1764663476667, onlineDateStr=2025-12-02, pubDate=1744646400000, pubDateStr=2025-04-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1764663476667, onlineIssueDateStr=2025-12-02, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1764663476667, creator=13701087609, updateTime=1764663476667, updator=13701087609, issue=Issue{id=1202649045064970391, tenantId=1146029695717560320, journalId=1190235702286704641, year='2025', volume='26', issue='4', pageStart='1', pageEnd='84', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1764663476482, creator=13701087609, updateTime=1768394410677, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1218297717336490184, tenantId=1146029695717560320, journalId=1190235702286704641, issueId=1202649045064970391, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1218297717336490185, tenantId=1146029695717560320, journalId=1190235702286704641, issueId=1202649045064970391, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=65, endPage=72, ext={EN=ArticleExt(id=1202649046059020445, articleId=1202649045840916634, tenantId=1146029695717560320, journalId=1190235702286704641, language=EN, title=The diagnosis method for abnormal current in converter transformer core and clamps based on neural networks and control chart method, columnId=1190338916357083282, journalTitle=Electrical Engineering, columnName=Technology & Application, runingTitle=null, highlight=null, articleAbstract=
The online monitoring system for converter transformers is a system that evaluates the transformer condition based on characteristic parameters. This system records various parameters during the operation of the converter transformer, including gas composition in the oil, SF6 gas pressure in the bushings, and leakage current in the core clamps. Among these, the core clamp current is a crucial indicator for determining the grounding condition and insulation strength of the transformer core. However, the internal electromagnetic environment of a converter transformer is quite complex during operation, and due to the limitations of sensor precision and operational conditions, the traditional threshold-based abnormal diagnosis methods for core clamp current have a high false alarm rate, posing challenges for refined operation and maintenance. This paper establishes a neural network-based core clamp current prediction model and uses the error between the predicted values and the online values as the observation metric. An abnormal diagnosis method for core clamp current based on the control chart method is proposed. The feasibility of this method is validated using core clamp current data from a ±800kV converter station. The experimental results show that the proposed method can avoid false alarms and accurately diagnose true alarms.
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换流变压器在线监测系统是根据特征参数评估变压器状态的系统,记录换流变压器的油中气体组分、套管SF6气体压力、铁心夹件泄漏电流等重要参数。其中,铁心夹件电流是判定换流变压器铁心接地状态及绝缘强度的重要依据。然而,换流变压器运行时的内部电磁环境较为复杂,并且受传感器精度和工况限制,定阈值的铁心夹件电流异常诊断方法的误报警率较高,给精益化运维工作带来了挑战。本文建立基于神经网络的铁心夹件电流预测模型,并将预测值与在线值的误差作为观测值,提出基于控制图法的铁心夹件电流异常诊断方法。利用某±800kV换流站内的换流变铁心夹件电流数据验证方法的可行性,实验结果表明,所提方法可以避免误告警,并准确判断出真告警。
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於 杨(1993—),男,本科,工程师,主要研究方向为特高压直流输电技术和电工电力新技术。
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於 杨(1993—),男,本科,工程师,主要研究方向为特高压直流输电技术和电工电力新技术。
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换流变 编号 | 误告警时间 | 真告警时间 |
| 1 | 2024-02-12 19:00(铁心) 2024-02-21 11:00(铁心) | |
| 2 | 2024-01-31 15:00(夹件) 2024-03-07 23:00(铁心) | |
| 3 | 2024-01-04 09:00(夹件) | 2024-02-19 11:00 (铁心) |
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换流变 编号 | 误告警时间 | 真告警时间 |
| 1 | 2024-02-12 19:00(铁心) 2024-02-21 11:00(铁心) | |
| 2 | 2024-01-31 15:00(夹件) 2024-03-07 23:00(铁心) | |
| 3 | 2024-01-04 09:00(夹件) | 2024-02-19 11:00 (铁心) |
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换流变 编号 | 告警时间 | 在线值/mA | 实测值/mA | 是否被 标记为 真告警 |
| 1 | 2024-02-12 | 252.01 | 92.54 | 否 |
| 2024-02-21 | 206.12 | 76.36 | 否 |
| 2 | 2024-01-31 | 241.33 | 69.02 | 否 |
| 2024-03-07 | 202.97 | 66.41 | 否 |
| 3 | 2024-01-04 | 204.59 | 75.41 | 否 |
| 2024-02-19 | 283.38 | 237.00 | 是 |
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换流变 编号 | 告警时间 | 在线值/mA | 实测值/mA | 是否被 标记为 真告警 |
| 1 | 2024-02-12 | 252.01 | 92.54 | 否 |
| 2024-02-21 | 206.12 | 76.36 | 否 |
| 2 | 2024-01-31 | 241.33 | 69.02 | 否 |
| 2024-03-07 | 202.97 | 66.41 | 否 |
| 3 | 2024-01-04 | 204.59 | 75.41 | 否 |
| 2024-02-19 | 283.38 | 237.00 | 是 |
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| 诊断结果 | 真实结果 |
| 真告警 | 假告警 |
| 真告警 | 2 | 1 |
| 假告警 | 0 | 41 |
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| 假告警 | 0 | 41 |
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