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Direct current partial discharge signal classification and identification method based on frequency spectrum energy distribution probability

A technology for distributing probability and discharge signals, applied in spectrum analysis, measuring electricity, measuring electrical variables, etc., can solve problems such as partial discharge and insulation performance degradation of electrical equipment

Pending Publication Date: 2021-12-28
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under the action of long-term high voltage, electrical equipment will inevitably have problems such as insulation performance degradation and partial discharge.

Method used

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  • Direct current partial discharge signal classification and identification method based on frequency spectrum energy distribution probability
  • Direct current partial discharge signal classification and identification method based on frequency spectrum energy distribution probability
  • Direct current partial discharge signal classification and identification method based on frequency spectrum energy distribution probability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Example 1 Partial discharge initiation of needle-plate electrode with different needle tip diameters.

[0085] In the experiment, the above-mentioned step-up method was used to determine the PD inception voltage of the needle-plate electrode structure when the diameter of the needle electrode was different, and the maximum field strength inside the model was calculated by using Ansoft simulation software. The experimental results are shown in the following table and Figure 9 shown.

[0086]

[0087] It can be seen from the experimental results that with the increase of the diameter of the needle electrode, the partial discharge inception voltage increases, and the reason is that the electric field in the gap becomes more and more uniform. But on the other hand, as the diameter of the electrode increases, the maximum field strength in the gap under the PD inception voltage decreases. It is believed that this phenomenon is due to the increase in the diameter of the ...

Embodiment 2

[0090] Example 2 PD pulse spectrum and energy distribution probability map of needle-plate electrodes under different needle tip diameters.

[0091] 11a1 to 11d2 in Fig. 11 are the average waveforms of PD pulses and the corresponding amplitude-spectrograms of needle plate electrodes with different diameters measured in experiments, respectively. In fact, when calculating the probability of discharge energy distribution in each frequency band and drawing the energy probability distribution diagram, all PD pulse waveforms under the initial voltage of PD are processed. The final processing results are as follows: Figure 12 shown.

[0092] Depend on Figure 12 It can be seen that with the increase of the diameter of the needle electrode, the energy in the mid-frequency range of the PD pulse increases and the energy in the low-frequency range decreases, but the discharge energy distribution is concentrated in the range of (≥50%, ≤50%, ≤10%).

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Abstract

The invention discloses a direct current partial discharge signal classification and identification method based on a frequency spectrum energy distribution probability. The method sequentially comprises a model building step, a data acquisition step, a smooth noise reduction processing step, a frequency spectrum division step and a distribution probability solving step. The method has the beneficial effects that the partial discharge under needle plate models with different diameters can be identified by drawing the ternary energy probability distribution diagram. The research is intended to lay a foundation for identifying the discharge type of the power equipment under the direct-current voltage and evaluating discharge hazards.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission, in particular to a method for classifying and identifying direct current partial discharge signals based on frequency spectrum energy distribution probability. Background technique [0002] High-voltage direct current transmission has the characteristics of large transmission capacity, long transmission distance, rapid control and adjustment of the magnitude and direction of transmission power, and low impact on the environment. It is especially suitable for alleviating the extremely unbalanced distribution of power load and power generation energy in my country. At present, the highest voltage level of HVDC transmission in my country is ±800kV, and the recently started construction of the Jinbei-Jiangsu ±800kV UHVDC transmission project will make my country's UHVDC transmission project more developed and stronger. [0003] Under the action of long-term high voltage, electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R23/167
CPCG01R31/1263G01R31/1272G01R23/167
Inventor 李原周凯袁豪杨森鸿龚薇朱光亚
Owner SICHUAN UNIV