AC/DC voltage-withstanding partial discharge test system based on rectangular time-frequency filter

Abstract

The invention relates to an AC / DC voltage-withstanding partial discharge test system based on a rectangular time-frequency filter, and the system comprises a partial discharge ultra-wideband detection system, an AC voltage-withstanding test module, a DC voltage-withstanding test module, a two-dimensional time-frequency window dynamic display module, a rectangular time-frequency filter algorithm module, and a voltage-withstanding partial discharge data dynamic display and storage module. The partial discharge ultra-wideband detection system is connected with the AC withstand voltage test module, the DC withstand voltage test module and the two-dimensional time-frequency window dynamic display module, and the two-dimensional time-frequency window dynamic display module is connected with the rectangular time-frequency filter algorithm module and the withstand voltage partial discharge data dynamic display and storage module. And the rectangular time-frequency filter algorithm module is connected with the voltage-withstanding partial discharge data dynamic display and storage module. Compared with the prior art, the system has the advantages of better anti-interference effect and the like.

Description

technical field [0001] The invention relates to an AC and DC withstand voltage partial discharge test system, in particular to an AC and DC withstand voltage partial discharge test system based on a rectangular time-frequency filter. Background technique [0002] After years of practice, many scientific researchers and engineering technicians have proposed anti-interference measures as shown in Table 1 (mainly see the standard DL / T 417-2006 "Guidelines for Field Measurement of Partial Discharge of Power Equipment"). In general, the AC and DC withstand voltage PD tests of power equipment use the conventional pulse current PD detection method (broadband or narrowband method, the detection frequency band is in the 1MHz) and the anti-drying measures shown in Table 1 can be carried out smoothly in the factory test, that is, under laboratory conditions. Taking the AC and DC withstand voltage PD test of the converter transformer as an example, the test circuit is as follows: fi...

AI Technical Summary

Problems solved by technology

[0006] However, for on-site handover and fault diagnosis tests, there are still working conditions where it is difficult to eliminate interfering pulse signals under complex electromagnetic backgrounds

The anti-interference technology recommended by the standard is difficult to implement, and the existing PD detection system often cannot distinguish whether the pulse signal comes from the interference source or the pressurized PD source

This makes AC and DC withstand voltage PD tests often require the experience of testers to make judgments, seriously affecting the test process, and there is also the possibility of misjudgment

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