Optimization of FRA by an Improved Numerical Winding Model: Disk Space Variation
Optimization of FRA by an Improved Numerical Winding Model: Disk Space Variation
复制标题
通过改进的数值缠绕模型优化 FRA：磁盘空间变化
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Dr. Satoru Miyazaki
中科院分区：
文献类型：
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作者：
M. Sc.;M. Tahir;S. Tenbohlen;Dr. Satoru Miyazaki
频率响应分析（FRA）是一种用于Transformer绕组状态评估的成熟方法，并已证明其检测各种机械和电气故障的灵敏度。虽然FRA测试程序已经标准化，但FRA结果的解释仍然是一个挑战，因为它仅限于该领域专家的分析。主要是，在文献中提出的电路模型，以支持解释的Transformer的频率响应。然而，这些集中参数模型仅限于一定的频率范围内，由于在计算参数，建立和解决一个转弯到转弯模型的困难。此外，在这些模型中，参数采用恒定值，而这些参数是频率相关的。与此相反，本文提出了一种改进的数值方法来获得基于匝数的Transformer绕组高频模型。该模型考虑了参数的频率相关影响。在该模型中，FRA迹线直接来自高频有限元模型（FEM），而不采用复杂的电路模型。为此，使用3D FEM模拟单相Transformer，其模拟Transformer和FRA测量操作。首先，该模型与绕组的健康状态的测量进行了验证。然后，实现不同级别的磁盘空间变化（DSV）故障。这种方法将有助于精确的故障模拟和FRA的客观解释。
Frequency response analysis (FRA) is a well-established method used for condition assessment of transformer windings and has proven its sensitivity for detecting various mechanical and electrical faults. Although the FRA test procedures have been standardised, the interpretation of FRA results is still a challenge as it is limited to analysis of the experts in the field. Mainly, circuit models are proposed in the literature for supporting the interpretation of the transformer frequency response. However, these concentrated parameters models are limited to a certain frequency range, due to the difficulties in calculating parameters to build and solve a turn-to-turn model. Moreover, constant values for the parameters are employed in these models, while these parameters are frequency dependent. In contrast, this paper presents an improved numerical method to obtain a turn-based high frequency model of transformer windings. This model considers the frequency dependent effects of parameters. In the proposed model, FRA traces are directly derived from a high frequency finite element model (FEM) without employing the complex circuit model. For this purpose, a single-phase transformer is simulated using 3D FEM, which emulate the transformer and FRA measurement operations. First, the model is validated with measurements for healthy state of the windings. Afterwards, various levels of disk space variation (DSV) fault are implemented. This approach will facilitate the precise fault simulation and ease the objective interpretation of FRA.