Distribution transformer winding material testing system and method

Abstract

The invention provides a distribution transformer winding material testing system and method, and the system comprises a temperature regulation and control device, a DC resistance test device, a temperature collection device, a to-be-tested transformer and a test transformer. The method comprises the steps of raising the temperature rapidly through an output current of the test transformer; realizing the temperature balance of the to-be-tested transformer via the temperature regulation and control device, adjusting the balance temperature continuously, obtaining the resistance values of a high-voltage winding and a low-voltage winding through a direct-current resistance testing device, and calculating to obtain the corresponding actual resistance ratio change relation along with the temperature under different balance temperatures and reference temperatures; and comparing with the resistance ratio change relation along with the temperature corresponding to a standard material to detect the winding material. According to the invention, the winding material of the transformer is discriminated by utilizing the characteristic that the resistance ratios of copper and aluminum at different temperatures are different along with the temperature change trend, the accuracy of a non-destructive testing method is improved, and meanwhile, the transformer can quickly reach the equilibrium temperature through heating at different stages, so that the testing efficiency is improved.

Description

technical field [0001] The invention relates to the field of detection of distribution transformer winding materials, in particular to a distribution transformer winding material testing system and method. Background technique [0002] At present, in the production of distribution transformers, some enterprises use relatively economical aluminum wires instead of copper wires as conductor materials in order to reduce costs. First of all, the two are used as conductive materials. In principle, the difference mainly lies in the difference in conductivity. Copper wire has higher conductivity than aluminum wire, and the power loss of copper wire is lower, which will eventually lead to poor quality of electricity for users. difference. Secondly, considering the cost, the price of the same unit of copper wire is about twice that of aluminum wire. In addition, copper wire conducts heat better than aluminum wire. For long-term use, copper wires have advantages over aluminum wires ...

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Problems solved by technology

[0004] 1. Judging the transformer winding material by comparing the volume and density of the body. For oil-immersed transformers, it can also be identified by using the volume of the oil tank and the quality of the oil. This identification method uses the data of a single sample as the basis for judgment, lacking more Strict theoretical derivation, poor reliability of identification results, and has certain limitations

[0005] 2. Use X-rays to identify the material of transformer windings; this identification method is more complicated to operate, and the final actual measurement results are poor due to the influence of scattered rays

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