The article describes the non-contact and contact analysis of 1-MVA dry power transformers with epoxy-resin insulation using an acoustic camera and frequency analyzer with automatic sweeping for low-middle frequency areas. Power transformers are most commonly used for construction component (core, windings, taps) analysis. The electrical, non-rotating machine generates electromagnetic and acoustic emissions that can be used to analyze dry transformers during their operation. Non-contact online diagnostic methods have many advantages over offline methods because it is not necessary to shut down the transformer, and also, the condition and behaviour of the machine are analyzed during its normal operation. The article presents the analysis and comparison of structural parts of the distribution dry transformers of the same type and power. The problem of insufficient or incorrect clamp-screw connection was identified using the SFRA (Sweep Frequency Response Analysis) method.

中文翻译：

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非接触式和接触式测量方法相结合分析干式变压器的结构状况

本文介绍了使用声学摄像机和频率分析仪（自动扫描中低频区域）对环氧树脂绝缘的 1-MVA 干式电力变压器进行非接触和接触分析。电力变压器最常用于结构组件（铁芯、绕组、抽头）分析。非旋转电机会产生电磁和声发射，可用于分析干式变压器在运行过程中的情况。非接触式在线诊断方法比离线方法具有许多优点，因为无需关闭变压器，并且可以在机器正常运行期间分析机器的状况和行为。本文对同类型、同功率的配电干式变压器的结构件进行了分析比较。