Low-voltage current transformer short time thermocurrent automation test apparatus and method

Abstract

The invention provides a low-voltage current transformer short time thermocurrent automation test apparatus and method. The apparatus comprises a control and data processing module, a mechanical electric voltage regulating module, a heavy current generation module and a sample explosion-proof module. The control and data processing module regulates input voltage of the heavy current generation module by controlling the mechanical electric voltage regulating module, and generates time-controllable heavy current at the primary side of a current transformer of the sample explosion-proof module by controlling switching on and off of a power supply input switch of the heavy current generation module. The test apparatus can automatically and precisely complete recording of short-time thermocurrent impact processes and data of the sample current transformer, so that the efficiency, the accuracy and the reliability of testing are greatly improved. Compared with a mode of adopting five-second equivalent testing, the invention is more similar to the real condition, and enables the test process to be more persuasive.

Description

technical field [0001] The invention relates to a detection device, in particular to a low-voltage current transformer short-term thermal current test device and a test method thereof. Background technique [0002] Low-voltage current transformers for metering are the main measuring instruments for power marketing, and their performance indicators are directly related to the accuracy of charging. The short-term thermal current impact test is an important test item for evaluating the performance of complex low-voltage current transformers. It is used to check whether the current transformer will fail when the complex low-voltage current transformer is subjected to a short-term impact current of 150 times. The ability of complex low-voltage current transformers to deal with short-circuit faults in power systems. [0003] Because the short-time thermal current test is characterized by short test time, large current and large capacity required by the equipment, it is difficult ...

AI Technical Summary

Problems solved by technology

However, this test method cannot accurately control the current and time, and the test process is not close to the actual working conditions

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