| 引用本文: | 赵云峰,张永强,聂德鑫,等.基于模糊和证据理论的变压器本体绝缘状态评估方法[J].电力系统保护与控制,2014,42(23):57-62. |
| ZHAO Yun-feng,ZHANG Yong-qiang,NIE De-xin,et al.Application of fuzzy and evidence theory in power transformers condition assessment[J].Power System Protection and Control,2014,42(23):57-62 |
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| 摘要: |
| 对电力设备运行状态进行准确可靠的评估是实施电力系统状态检修的前提和基础。以500 kV油浸式变压器为研究对象，构建了基于模糊和证据理论的变压器本体状态评估模型。选取预防性试验中具有代表性的参数为状态评估的指标，参考评价指标的出厂值和越限值进行指标归一化，利用模糊评判方法确定各个指标相对于不同状态评估等级的隶属度。将这些指标分为油中溶解气体、油化试验和电气试验三个子证据体，利用证据理论对三个子证据体进行信息合成，进而对变压器本体的运行状态进行评估。通过对某台500 kV变压器数据的实例分析验证了该评估模型应用于变压器本体状态评估中的有效性。该评估模型思路清晰，不需要大量的历史数据，为变压器状态评估提供了一种新方法。 |
| 关键词: 电力变压器 模糊评判 证据理论 状态评估 |
| DOI：10.7667/j.issn.1674-3415.2014.23.009 |
| 分类号: |
| 基金项目:山西省电力公司科技项目(KJ[2011]333)；国家重点基础研究发展计划(973)项目(2009CB724507) |
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| Application of fuzzy and evidence theory in power transformers condition assessment |
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ZHAO Yun-feng1, ZHANG Yong-qiang1, NIE De-xin2, SONG You2, CAI Wei2
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1.State Grid Shanxi Electric Power Company, Taiyuan 030001, China;2.State Grid Electric Power Research Institute,
Wuhan 430074, China
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| Abstract: |
| Power equipment condition assessment is the premise and foundation of power system condition-based maintenance. A power transformer condition assessment method based on fuzzy and evidence theory for 500 kV oil-immersed power transformers is proposed. Some representative parameters in preventive test are chosen as the condition assessment indexes, and all of these indexes are normalized according to ex-factory value and off-limit value. The membership to different condition assessment level of the assessment indexes is determined by fuzzy evaluating method. All the assessment indexes are divided into three sub-evidences, which are DGA, oil test and electrical test. Set information composition of these sub-evidences based on evidence theory, and then the power transformers condition assessment are determined by the information composition results. The effectiveness of the transformer condition assessment model is verified by example analysis of 500 kV power transformer parameters. The assessment model is clear and does’t need a lot of historical data, which offers a new way for power transformer condition assessment. |
| Key words: power transformer fuzzy evaluating evidence theory condition assessment |
