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首页> 外文会议>2016 IEEE International Conference on Power System Technology >Condition assessment of power transformer bushing using SFRA and DGA as auxiliary tools
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Condition assessment of power transformer bushing using SFRA and DGA as auxiliary tools

机译：使用SFRA和DGA作为辅助工具的电力变压器套管状态评估

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摘要

Dielectric insulation of a transformer bushing deteriorates as a function of temperature, oxidation, and moisture. This causes accelerated aging of oil and cellulosic solid insulation, generating fault gases within bushing oil and eventual permanent failure. To prevent such failures, effective analyses and diagnoses need to be investigated. Dissolved Gas Analysis (DGA) can give the indication of internal abnormalities inside the transformer bushing. In addition, Frequency response analysis (FRA) is a widely accepted tool for mechanical deformation diagnosis within power transformers. Although a large number of studies have been conducted on the detection of transformer winding deformation by FRA technique, the impact of bushing faults on the transformer FRA signature has not been sufficiently investigated. It is the goal of this paper to propose precise simulation as well as practical analyses demonstrating the impact of bushing faults on the FRA signature. A real transformer bushing geometry is modelled through 3D finite element analysis (FEM) on which different bushing faults are emulated. To verify the derived simulation results, DGA of transformer oil as well as FRA are performed on a three-phase, 132 kV, 315 MVA power transformer. It can be observed clearly from the results, that bushing faults have an impact on the FRA signature and DGA of the power transformer.
机译：变压器套管的介电绝缘性能会随温度，氧化和湿度而变差。这会导致油和纤维素固体绝缘的加速老化，在套管油内产生故障气体，并最终导致永久性故障。为防止此类故障，需要对有效的分析和诊断进行调查。溶解气体分析（DGA）可以指示变压器套管内部的内部异常。此外，频率响应分析（FRA）是电力变压器内部机械变形诊断的一种广泛接受的工具。尽管已经对通过FRA技术检测变压器绕组变形进行了大量研究，但是套管故障对变压器FRA信号的影响尚未得到充分研究。本文的目的是提出精确的仿真和实际分析，以证明套管故障对FRA信号的影响。通过3D有限元分析（FEM）对真实的变压器套管几何图形进行建模，并在此3D有限元分析中模拟不同的套管故障。为了验证得出的仿真结果，对三相132 kV，315 MVA电力变压器执行了变压器油的DGA以及FRA。从结果可以清楚地看到，套管故障对电力变压器的FRA信号和DGA产生影响。

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