Abstract
To detect the material defect of dry transformer winding, a series of study were carried out concerning about the law of absorption ray intensity of matter, detection methods and procedures and Photographic density variation rule of copper and aluminium. The field detection was also conducted in residential area without preliminary treatment.
Highlights
The transformer can be divided into copper winding transformer and aluminium winding transformer according to different winding materials
1) The material detection method of dry transformer winding based on X-ray absorption principle and related theoretical basis are introduced in detail
This method can be used to detect the material of dry transformer winding in actual field test, and realize accurate judgment of copper and aluminium
Summary
The transformer can be divided into copper winding transformer and aluminium winding transformer according to different winding materials. Due to the high copper prices at home and abroad, the number of aluminium winding transformers experienced a significant growth[1-5]. Most of the aluminium winding transformers in the market are in the awkward situation that manufacturers swap the windings from copper wires to aluminium wires for economic benefits without the knowledge of power users[6-7]. This "aluminium-filled copper" transformer enters the power grid and brings huge security hidden trouble to the operation of the power system. The aluminium winding transformer is sold as copper winding transformer, which causes loss to the economic of power users. The principle of the correlation detection, influence factors and detection technology were discussed
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