Purpose

This study presents a new method for the detection of faults in large transformer cores. It is based on the analysis of leakage flux components in the vicinity of the sheet stack. The purpose of this study is to provide a nondestructive analysis tool for transformer cores during the assembly process to detect accidental defects such as inter-laminar short circuits.

Design/methodology/approach

The different components of the leakage flux allow localization of the fault in the stack and also permit to assess its severity. Out of the many kinds of defects which may appear in a transformer core, this method only detects those which actually cause an increase in the transformer’s global iron losses, which are thus the most detrimental.

Findings

The proposed method allows a more efficient control of the quality of the cores during their manufacturing process. Until now, it was only possible to know the quality of the core when the transformer was fully assembled.

Research limitations/implications

The accuracy of the method depends on the size of the defect and may request many measurements to give usable information.

Practical implications

Controlling iron losses in a core during its construction avoids heavy dismantling operations, both financially and temporally.

Originality/value

This method can help transformer manufacturers optimize their building process. In addition, the method remains effective regardless of the size of the core considered.

中文翻译：

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变压器铁心附近漏磁通的测量：在故障检测和定位中的应用

目的

本研究提出了一种检测大型变压器铁心故障的新方法。它基于对片叠附近漏磁通分量的分析。本研究的目的是为变压器铁芯在装配过程中提供一种无损分析工具，以检测层间短路等意外缺陷。

设计/方法/方法

漏磁通的不同分量允许在堆栈中定位故障并允许评估其严重性。在变压器铁心可能出现的多种缺陷中，这种方法只检测那些实际上导致变压器整体铁损增加的缺陷，因此是最有害的。

发现

所提出的方法允许在其制造过程中更有效地控制芯的质量。到目前为止，只有在变压器完全组装好后才能知道磁芯的质量。

研究限制/影响

该方法的准确性取决于缺陷的大小，并且可能需要多次测量才能提供可用信息。

实际影响

在建造过程中控制铁芯中的铁损可以避免大量的拆除操作，无论是经济上还是时间上。

原创性/价值

这种方法可以帮助变压器制造商优化他们的构建过程。此外，无论考虑的核心尺寸如何，该方法仍然有效。