Test device and method for detecting winding deformation of power transformer

Abstract

The invention relates to a test apparatus and a test method used for testing the distortion of a coil of a power transformer. The apparatus comprises an upper computer, a test unit, a DDS sweeping signal generator unit, a wide-frequency power amplifier unit and a power supply system. The test unit comprises a CPU, a data collecting unit, a logic control module and a communication unit; the CPU communicates with the upper computer through the communication unit and sends work instructions to the logic control module according to the instructions of the upper computer and simultaneously sends an instruction to the DDS sweeping signal generator unit to lead the unit to generate a corresponding sweeping signal; the sweeping signal generated by the DDS sweeping signal generator unit is transmitted to a coil on one side of the tested power transformer; the data collecting unit is respectively connected with two ends of the coil of the power transformer to collect data for regulation and convert the data into digital signals which are transmitted to the CPU for computation and then the computation result is transmitted to the upper computer through the communication unit; the logic control module is simultaneously connected with the CPU and the data collecting unit to control the data collection and transmission.

Description

technical field [0001] The invention relates to a test device and a test method of a power system, in particular to a test device and a test method for detecting deformation of a power transformer winding. Background technique [0002] During the operation and transportation of power transformers, the windings may be subjected to mechanical force or electric force, resulting in local distortion, swelling or displacement of the windings, which will directly cause sudden accidents in severe cases. After the local deformation of the winding, even if it is not damaged immediately, it may leave a serious potential failure. Therefore, it has become an important transformer state diagnosis item to carry out deformation test on transformer winding and judge the state of winding. [0003] At present, the following two methods are used to diagnose winding deformation: one is the frequency response analysis method (referred to as the frequency response method); the other is the reacta...

AI Technical Summary

Problems solved by technology

In order to detect the deformation of the power transformer winding, it is generally necessary to conduct two tests of the reactance method and the frequency response method. However, due to the different test equipment and wiring methods used in the two test methods, it is necessary to re-wire when using different test methods, which is extremely consuming. Time-consuming and labor-intensive, which brings great inconvenience to the on-site testing work

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