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WebA SFRA open circuit test will show the response of core and windings, while a SFRA short circuit test only shows the response of windings. Each frequency range corresponds to dfferent components in the transformer. Some general frequency ranges are shown below. 20 Hz – 2 kHz: Main core deformation, open circuits, shorted turns, residual magnetism Webthat, the SFRA ratio test ofers a more visi-ble indication of the defective winding. With a simple calculation of the deviation between traces, SFRA Ratio identifies the winding … truck joy
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