CN110596556A - Self-healing discharge test system and method for metallized film capacitor based on sound pressure intensity - Google Patents
Self-healing discharge test system and method for metallized film capacitor based on sound pressure intensity Download PDFInfo
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- CN110596556A CN110596556A CN201910984909.8A CN201910984909A CN110596556A CN 110596556 A CN110596556 A CN 110596556A CN 201910984909 A CN201910984909 A CN 201910984909A CN 110596556 A CN110596556 A CN 110596556A
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- sound pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2601—Apparatus or methods therefor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a self-healing discharge test system and method of a metallized film capacitor based on sound pressure intensity, comprising a sound insulation box, a sound pressure microphone sensor, an insulation table, a signal transfer box, a data acquisition card and a PC; the utility model discloses a sound insulation box, including sound insulation box, data acquisition card, insulating table sets up in the bottom of sound insulation box, and the condenser that awaits measuring is placed at the insulating table, and the electrode bar is all installed to the top and the below of sound insulation box, the electrode bar is connected with DC power supply, and the condenser passes through the wire and is connected with the electrode bar, the interior wall mounting of box of sound insulation box sound pressure microphone sensor, sound pressure microphone sensor with signal switching box connects, signal switching box. The test circuit is simple and convenient, is easy to build, and can monitor the sound pressure waveform in real time, capture and store the self-healing pulse signal, play back the waveform, perform filtering analysis and count the self-healing times.
Description
Technical Field
The invention relates to the field of capacitor self-healing detection, in particular to a metalized film capacitor self-healing discharge testing system and method based on sound pressure.
Background
The metallized film capacitor adopts a polypropylene film as a medium, and a layer of thin metal is evaporated on the surface of the polypropylene film to be used as a conductive electrode. When an over-high voltage is applied, the electric weak point of the polypropylene film is broken down, the resistance of a breakdown point is obviously reduced, the density of the flowing current is rapidly increased, so that the metalized plating layer generates high heat, the metal conductor around the breakdown point is rapidly evaporated and dissipated to form a blank area of the metalized plating layer, and the breakdown point automatically recovers insulation, which is called as self-healing of the capacitor. The method for detecting the self-healing is to listen to the self-healing sound manually, but the test result is very inaccurate due to the interference of external noise and the limitation of artificial hearing.
Disclosure of Invention
The invention aims to provide a metallized film capacitor self-healing discharge testing system and method based on sound pressure, which can accurately record the self-healing time of a metallized film capacitor and count the times.
The technical scheme adopted by the invention for solving the technical problems is as follows: the self-healing discharge testing system of the metallized film capacitor based on the sound pressure intensity is constructed, and comprises a sound insulation box, a sound pressure microphone sensor, an insulation table, a signal transfer box, a data acquisition card and a PC (personal computer);
the utility model discloses a sound insulation box, including sound insulation box, data acquisition card, insulating table sets up in the bottom of sound insulation box, and the condenser that awaits measuring is placed at the insulating table, and the electrode bar is all installed to the top and the below of sound insulation box, the electrode bar is connected with DC power supply, and the condenser passes through the wire and is connected with the electrode bar, the interior wall mounting of box of sound insulation box sound pressure microphone sensor, sound pressure microphone sensor with signal switching box connects, signal switching box.
In the scheme, soundproof cotton is paved on the inner wall of the soundproof box.
In the above scheme, eight sound pressure microphone sensors are arranged, and two sound pressure microphone sensors are respectively embedded on the front, back, left and right surfaces of the inner wall of the sound insulation box.
In the above scheme, the horizontal plane of the sound pressure microphone sensor is located at one half of the height of the capacitor.
In the above scheme, the sound pressure microphone sensor lead is led out from the hole on the inner wall of the right side of the sound insulation box.
The invention also provides a testing method of the self-healing discharge testing system of the metallized film capacitor based on the sound pressure, which comprises the following steps: an external direct current power supply supplies power to the capacitor according to a set required value and power-on time, and after power-on is finished, waveform data of the sound pressure microphone sensor are monitored through the PC to capture self-healing pulses in the waveform data; the data of each sound pressure microphone sensor corresponds to a channel, each pulse gives out a channel sequence according to the peak value of each channel, and the direction of the microphone sound pressure microphone sensor with the largest pulse is selected as the azimuth angle of the pulse; through the analysis of pulse waveforms, waveform frequency bands are set, filtering processing is carried out, then pulse width and corresponding threshold values are set, and the times of self-healing pulses are counted.
The self-healing discharge test system and method of the metallized film capacitor based on the sound pressure intensity have the following beneficial effects:
the test circuit is simple and convenient, is easy to build, and can monitor the sound pressure waveform in real time, capture and store the self-healing pulse signal, play back the waveform, perform filtering analysis and count the self-healing times.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a self-healing discharge testing system for a metallized film capacitor based on acoustic pressure intensity according to the present invention;
FIG. 2 is a system monitoring waveform tile;
fig. 3a to 3c are pulse signal amplification analysis diagrams.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a metalized film capacitor 3 self-healing discharge test system based on sound pressure intensity, which comprises a sound insulation box 1, a sound pressure microphone sensor 5, a capacitor 3, an insulation platform 2, a signal transfer box 7, a data acquisition card 8 and a PC 9.
As shown in fig. 1, the size of the sound insulation box 1 is 1 mx 1M, sound insulation cotton is laid on the inner wall, an insulation table 2 is placed at the center of the bottom of the sound insulation box 1, and the capacitor 3 element to be measured is vertically placed on the insulation table 2.
As shown in fig. 1, an electrode rod 4, which is a positive electrode and a negative electrode, is respectively installed right above the top and below the left side of the sound-proof box 1 and is used for being externally connected with a direct current power supply, and the inside of the electrode rod 4 is connected with a capacitor 3.
As shown in fig. 1, eight sound pressure microphone sensors 5 are uniformly embedded on the inner walls of four sound-proof boxes 1, front, back, left and right, the plane is perpendicular to the half of the height of the capacitor 3, and the lead wires of the sound pressure microphone sensors 5 are led out from the right side opening holes on the inner walls of the sound-proof boxes 1.
The lead of the sound pressure microphone sensor 5 is connected with a signal adapter box 7 through an opening 6 on the right side of the box wall, the output end of the signal adapter box 7 is connected with a data acquisition card 8, and the data acquisition card 8 is installed on a clamping groove of a PC9 case.
After the arrangement and wiring of the device are completed, an external direct current power supply is switched on, the PC9 is started, and the software is started.
The invention also provides a testing method of the self-healing discharge testing system of the metallized film capacitor 3 based on the sound pressure intensity, which comprises the following steps:
an external direct current power supply supplies power to the capacitor 3 according to a set required value and power-on time, and after power-on is finished, waveform data of the sound pressure microphone sensor 5 are monitored through the PC9 to capture self-healing pulses in the waveform data; the data of each sound pressure microphone sensor 5 corresponds to a channel, each pulse gives a channel sequence according to the peak value of each channel, and the direction of the microphone sound pressure microphone sensor 5 with the largest pulse is selected as the azimuth angle of the pulse; through the analysis of pulse waveforms, waveform frequency bands are set, filtering processing is carried out, then pulse width and corresponding threshold values are set, and the times of self-healing pulses are counted.
Fig. 2 is a system monitoring waveform tile chart, namely, the sound pressure signals acquired by all channels are tiled and displayed on an interface.
And an external direct-current power supply supplies power to the capacitor 3 according to the set required value and the power-on time, after the power-on is finished, a 'stop' button above the software is clicked, the waveform monitoring is finished, and the waveform data record is automatically stored.
As shown in fig. 2, the lower left data list is the saved waveform recording directory, and the waveform recording can be viewed by clicking the left "graphic playback".
As shown in fig. 3 a-3 c, which are pulse signal amplification analysis diagrams, a captured self-healing pulse is shown in a red circle.
As shown in fig. 3 a-3 c, the self-healing pulses collected by different channels at the same time have different peak values, each pulse gives a channel ordering according to the peak value of each channel, and the direction of the microphone with the largest peak value is selected as the azimuth angle of the pulse.
Through the analysis of the pulse waveform, the waveform frequency band is set, filtering processing is carried out, and then the pulse width and the corresponding threshold value are set, so that the times of self-healing pulses can be counted smoothly.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A self-healing discharge test system of a metallized film capacitor based on sound pressure intensity is characterized by comprising a sound insulation box, a sound pressure microphone sensor, an insulation table, a signal transfer box, a data acquisition card and a PC;
the utility model discloses a sound insulation box, including sound insulation box, data acquisition card, insulating table sets up in the bottom of sound insulation box, and the condenser that awaits measuring is placed at the insulating table, and the electrode bar is all installed to the top and the below of sound insulation box, the electrode bar is connected with DC power supply, and the condenser passes through the wire and is connected with the electrode bar, the interior wall mounting of box of sound insulation box sound pressure microphone sensor, sound pressure microphone sensor with signal switching box connects, signal switching box.
2. A sound pressure based metallized film capacitor self-healing discharge testing system according to claim 1, wherein soundproof cotton is laid on the inner wall of the soundproof box.
3. A sound pressure based metallized film capacitor self-healing discharge testing system according to claim 1, wherein eight sound pressure microphone sensors are provided, and two sound pressure microphone sensors are respectively embedded on the front, back, left and right surfaces of the inner wall of the soundproof box.
4. A sound pressure based metallized film capacitor self-healing discharge testing system according to claim 1, wherein the sound pressure microphone sensor is located at a level that is one-half of the height of the capacitor.
5. A sound pressure based metallized film capacitor self-healing discharge testing system according to claim 1, wherein the sound pressure microphone sensor lead is routed from a hole in the right side inner wall of the sound isolation box.
6. A testing method of the self-healing discharge testing system for the metallized film capacitor based on the sound pressure according to claim 1, comprising: an external direct current power supply supplies power to the capacitor according to a set required value and power-on time, and after power-on is finished, waveform data of the sound pressure microphone sensor are monitored through the PC to capture self-healing pulses in the waveform data; the data of each sound pressure microphone sensor corresponds to a channel, each pulse gives out a channel sequence according to the peak value of each channel, and the direction of the microphone sound pressure microphone sensor with the largest pulse is selected as the azimuth angle of the pulse; through the analysis of pulse waveforms, waveform frequency bands are set, filtering processing is carried out, then pulse width and corresponding threshold values are set, and the times of self-healing pulses are counted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910984909.8A CN110596556A (en) | 2019-10-21 | 2019-10-21 | Self-healing discharge test system and method for metallized film capacitor based on sound pressure intensity |
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| CN201910984909.8A CN110596556A (en) | 2019-10-21 | 2019-10-21 | Self-healing discharge test system and method for metallized film capacitor based on sound pressure intensity |
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| CN110596556A true CN110596556A (en) | 2019-12-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567770A (en) * | 2020-04-29 | 2021-10-29 | 优普电子（苏州）有限公司 | Self-healing discharge test system and method for metalized film capacitor |
Citations (4)
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| CN102654554A (en) * | 2012-02-14 | 2012-09-05 | 工业和信息化部电子第五研究所 | Detection method of self-healing breakdown of capacitor |
| CN102959656A (en) * | 2010-06-29 | 2013-03-06 | 东丽株式会社 | Biaxially oriented polypropylene film, metalized film, and film capacitor |
| CN109031079A (en) * | 2018-06-28 | 2018-12-18 | 安徽开博电容科技有限公司 | A kind of high-voltage metallized membrane capacitance simulation self-healing test method |
| CN208271747U (en) * | 2018-05-19 | 2018-12-21 | 南安欣久商贸有限公司 | A kind of oil-free self-healing high voltage shunt capacitor with alarm function |
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2019
- 2019-10-21 CN CN201910984909.8A patent/CN110596556A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102959656A (en) * | 2010-06-29 | 2013-03-06 | 东丽株式会社 | Biaxially oriented polypropylene film, metalized film, and film capacitor |
| CN102654554A (en) * | 2012-02-14 | 2012-09-05 | 工业和信息化部电子第五研究所 | Detection method of self-healing breakdown of capacitor |
| CN208271747U (en) * | 2018-05-19 | 2018-12-21 | 南安欣久商贸有限公司 | A kind of oil-free self-healing high voltage shunt capacitor with alarm function |
| CN109031079A (en) * | 2018-06-28 | 2018-12-18 | 安徽开博电容科技有限公司 | A kind of high-voltage metallized membrane capacitance simulation self-healing test method |
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| 国家质量技术监督局: "《GB/T 17702.2-1999》", 23 March 1999 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113567770A (en) * | 2020-04-29 | 2021-10-29 | 优普电子（苏州）有限公司 | Self-healing discharge test system and method for metalized film capacitor |
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Effective date of registration: 20201113 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Applicant after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Applicant after: NARI Group Corp. Applicant after: STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Applicant before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |
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Application publication date: 20191220 |