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Power transformers are a key element of power networks and therefore their periodic condition assessment becomes essential.
One of the most important aspects of the transformer assessment is the detection of mechanical deformations of transformer windings which can result in many cases, from short circuits in the network as well as reduced clamping pressure due to insulation aging.
Several methods exist for detection of displacement or deformation of transformer windings. Among all the most popular are three phase and single phase leakage inductance or impedance measurements. However, because these measurements utilise fixed frequency of 50 Hz or 60 Hz, the detection sensitivity is much lower in comparison with the SFRA method, where the measurements are typically performed at frequencies from few Hz up to 2MHz.
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