Transformer copper-clad aluminum winding detector and detection method

Abstract

The invention provides a transformer copper-clad aluminum winding detector and a detection method. The detector comprises a low-frequency signal generator, which is connected with a transformer winding and generates a sine wave signal for the transformer winding. The low-frequency signal generator and the lead end of the transformer winding are connected with a signal processing unit through one same frequency sampling unit; the lead end of the transformer winding is also connected with a voltage and current sampling unit capable of collecting voltage and current of a sampled signal; the signal processing unit carries out signal integration and calculation, and then, outputs AC resistance slope under each frequency to an image display unit connected therewith; and meanwhile, the signal processing unit calculates AC resistance slope of fine copper under each frequency according to the collected frequency and outputs the AC resistance slope to the image display unit connected therewith. The detection method is realized based on the alternating current skin effect principle, that is, the higher the alternating current frequency is, the larger the measured AC resistance is, so that whether a wire is a copper-clad aluminum coil can be effectively detected.

Description

technical field [0001] The invention relates to a transformer copper-clad aluminum winding detector and a detection method, belonging to the technical field of transformer electrical testing. Background technique [0002] Existing technologies generally use destructive methods to detect transformer windings, mainly including: 1) "section polishing measurement method", the specific steps are: cut a wire sample of appropriate length from one end of the sample, grind and polish the cross section of the conductor If there is some whitish (aluminum color) on the section, it can be identified as copper-clad aluminum; 2) "Outer diameter quality method", the specific steps are: by measuring the quality and outer diameter data of a certain length of wire, the quality and outer diameter Substituting the data into the calculation formula, the quality of the wire can be obtained through simple calculation, and it can be identified whether it is copper-clad aluminum by comparing with the...

AI Technical Summary

Problems solved by technology

The first two methods need to be truncated, which is not suitable for the overall assembled transformer; the third method is greatly affected by the environment, and the winding wire diameter is small and the use of multi-strand windings will have a great impact on the imaging results.

[0003] Due to the particularity of the transformer structure, destructive testing methods such as intercepting samples cannot be used. At the same time, there is no effective nondestructive testing method in China.

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