NEWS

A Check whether there are obvious abnormalities by observing the appearance of the transformer. For example, whether the coil lead wire is broken and desoldered, whether the insulating material has scorching marks, whether the iron core fastening screw is loose, whether the silicon steel sheet is rusted, and whether the winding coil is exposed.
B Insulation test. Use multimeter R × The 10k gear is used to measure the resistance between iron core and primary, primary and secondary, iron core and secondary, electrostatic shielding layer and secondary, and secondary windings. The pointer of the multimeter should be at infinity. Otherwise, the insulation performance of the transformer is poor.
C. Detection of coil on/off. Set the multimeter to R × First gear, in the test, if the resistance value of a winding is infinite, it indicates that the winding has an open circuit fault.
D. Identify the primary and secondary coils. The primary pin and secondary pin of the power transformer are generally led out from both sides, and the primary winding is usually marked with 220V, while the secondary winding is marked with rated voltage, such as 15V, 24V, 35V, etc. Then identify according to these marks.

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