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Automatic clustering separation method for multi-source partial discharge signals

A discharge signal and separation method technology, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve problems such as inability to perform correct diagnosis and disappearance of statistical features, so as to facilitate identification and diagnosis, improve effectiveness, Applicable to a wide range of effects

Inactive Publication Date: 2018-10-16
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when there are multiple discharge defects inside the electrical equipment, or there is discharge interference at the end of the bushing of the high-voltage outlet of the equipment or in the adjacent area, the multi-source superposition signal detected by the sensor will make its statistical characteristics disappear, resulting in the inability to perform correct diagnosis

Method used

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  • Automatic clustering separation method for multi-source partial discharge signals
  • Automatic clustering separation method for multi-source partial discharge signals
  • Automatic clustering separation method for multi-source partial discharge signals

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Embodiment 1

[0034] In this embodiment, two sensors are installed, such as figure 1 Shown is the flow diagram of the present invention to realize the method for automatic clustering and separation of multi-source partial discharge signals, and its specific steps are as follows:

[0035] Step 1: Synchronously detect the partial discharge signal through the first sensor 1 and the second sensor 2 installed in different positions, and obtain its amplitude Vi and phase

[0036] Step 2: Judgment of the synchronous pulse of the partial discharge signal detected by the first sensor 1 and the second sensor 2, the judgment method is when the phase difference of the detected partial discharge signal pulse , it is considered as a synchronous signal;

[0037] Step 3: If it is a synchronous pulse, extract the synchronous signal pulse data from all partial discharge signals detected in step 1;

[0038] Step 4: Calculate the amplitude ratio Ri of all synchronous signal pulses on the time domain wavef...

Embodiment 2

[0050] This embodiment simulates the spike discharge in the air and the interference of fluorescent lamps. After the test power supply passes through the isolation transformer T 0 After voltage regulation output, connect to 110kV test transformer, transformer T 0 It is used to realize the electrical isolation of the high-voltage test circuit and the low-voltage power supply circuit, and prevent the introduction of interference from the low-voltage power supply side. After the outgoing line of the test transformer 11 passes through the protective resistor, the end is connected to a smooth metal guide rod 15 for placing discharge models, including a suspension discharge model 12 and a spike discharge model 13 . The sharpened copper wire is fixed on the metal guide rod to form a spike discharge, and the fluorescent lamp discharge simulates the interference discharge source, such as Figure 5 As shown, the distance between the third sensor 9 and the fourth sensor 10 is 5 meters. ...

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Abstract

The invention relates to the technical field of partial discharge anti-interference in electrical equipment, and discloses an automatic clustering separation method for multi-source partial dischargesignals, comprising: a plurality of modules acquiring partial discharge signals, acquiring amplitude Vi and phase (shown in the description) of the signals to judge whether acquired partial dischargesignal pulses are synchronous; if the pulses are synchronous, extracting synchronous signal pulse data of different acquisition modules from all the partial discharge signals, calculateing a ratio Riof amplitudes of all synchronous signal pulses received by the different acquisition modules, clustering and analyzing the amplitude ratio Ri to separate pulses of different discharge modes; accordingto phase amplitude (shown in the description) information, mapping a statistical spectrum of each type of discharge pulse. The automatic clustering separation method is used in the situation that a plurality of discharge sources and adjacent interference signals exist in the environment space of the equipment under test, so as to realize the separation of the plurality of discharge sources and the interference signals through automatic clustering separation, and to improve the effectiveness of partial discharge detection and the accuracy of subsequent fault diagnosis.

Description

technical field [0001] The invention relates to the technical field of partial discharge anti-interference in electrical equipment, in particular to an automatic clustering and separation method for multi-source partial discharge signals, which is used in the occasion where there are multiple discharge sources and adjacent interference signals in the environmental space where the tested equipment is located , through automatic clustering and separation technology, the partial discharge signals generated by multiple discharge sources are separated. Background technique [0002] A large number of electrical equipment are used in the power system. The insulating materials of commonly used electrical equipment are mostly organic materials, such as transformer oil, insulating paper, epoxy and other insulating materials. Electrical equipment will have some defects due to some reasons such as unstrict process and improper transportation. During normal operation, the electric field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1227
Inventor 吴德贯黄和燕李红元潘凯龙方宇夏辉许毅邵成林杨栋金辉王鑫罗朋振肖黄能
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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