Intelligent tester for secondary polarities of four-star voltage transformers

Abstract

The invention provides an intelligent tester for secondary polarities of four-star voltage transformers. The intelligent tester comprises a primary-side device, a secondary-side device and a power module. The primary-side device comprises a voltage generating circuit, a controller, a signal conditioning circuit and a first wireless communication module; the voltage generating circuit, the first wireless communication module and the signal conditioning circuit are electrically connected with the controller by signals; the secondary-side device comprises a voltage acquisition and conversion circuit, an information processor, a liquid crystal display, a second wireless communication module and a keyboard; the voltage acquisition and conversion circuit, the liquid crystal display, the second wireless communication module and the keyboard are electrically connected with the information processor by signals; the first wireless communication module and the second wireless communication module are in wireless communication connection with each other. The intelligent tester has the advantages that whether secondary-side wiring of the four-star voltage transformers is correct or not and error types of secondary-side wiring of the four-star voltage transformers can be automatically judged by the aid of the intelligent tester and can be tested quickly and accurately, accordingly, the intelligent tester is convenient to operate, visual display effects can be realized, the work efficiency can be greatly improved, and potential safety hazards can be reduced.

Description

technical field [0001] The invention relates to a detection device for a voltage transformer in a power supply system, in particular to an intelligent tester for testing whether the polarity of a secondary circuit of a four-star voltage transformer is correct or not. Background technique [0002] In the 10kV system of the power supply grid, in order to eliminate the adverse effect of ferromagnetic resonance on the voltage transformer, the three-phase four-star voltage transformer (referred to as three-phase four PT) has been widely used. The wiring method in the application is as follows: Figure 4 shown. Before the voltage transformer is put into operation, the correctness of the secondary polarity of the voltage transformer must be tested to ensure that its secondary wiring is correct, otherwise it will cause problems such as malfunction of the protection device and directly affect the safe and stable operation of the power system . For the test of the polarity correctnes...

AI Technical Summary

Problems solved by technology

The disadvantages of using the traditional testing method are: firstly, the requirement for the quality of the on-site testing personnel is relatively high, and the testing personnel are required to have corresponding professional knowledge on the four-star voltage transformer; The secondary circuits of transformers are often far apart. During the test, the personnel stationed on the primary side to exert pressure must coordinate with the secondary circuit testers to complete the entire test process. The work efficiency is low and there are certain safety hazards

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