CN100483144C - Corona detecting method and system for insulator remote surface on optical amplifier - Google Patents
Corona detecting method and system for insulator remote surface on optical amplifier Download PDFInfo
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- CN100483144C CN100483144C CNB2006100609867A CN200610060986A CN100483144C CN 100483144 C CN100483144 C CN 100483144C CN B2006100609867 A CNB2006100609867 A CN B2006100609867A CN 200610060986 A CN200610060986 A CN 200610060986A CN 100483144 C CN100483144 C CN 100483144C
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Abstract
This invention relates to a method for testing insulator remote surface corona based on an optical amplifier including: a, aligning an optical location system to a discharge position of a being tested compound insulator to get an ultraviolet signal generated by weak discharging along the surface of the insulator to be amplified by the optical amplifier and converted to an electric signal to be collected, stored and analyzed by a computer with a data collection method to decide the corona position and acute state of its discharge.
Description
Technical field
The invention belongs to electrical equipment malfunction diagnostic techniques field, particularly a kind of based on image intensifer insulator remote surface corona detection method and realize the composite insulator remote surface corona detection system of this method.
Background technology
Insulator is one of maximum and of paramount importance element of quantity in the electric system external insulation, is the important component part of overhead transmission line, in electric system power transmission and transformation external insulation crucial status is arranged.Series of advantages such as composite insulator is in light weight with it, intensity is high, be difficult for broken, pollution flashover voltage is high, need not zero value detection, be easy to make, transportation, installation and maintenance have been broken the dominant position of pottery, glass insulator, be widely used in decades recently, according to statistics, composite insulator is tried out number above 6,000,000 in nationwide integrated power grid.But the ageing-resistant performance of composite insulator is not ideal enough, comparatively serious catabiosis can take place in full skirt and sheath under the combined action of surface-discharge, corona discharge, ultraviolet ray, acid rain etc., even the further destruction that causes insulator, cause serious power system accident.Corona discharge is the one of the main reasons that causes galvanic corrosion aging; Simultaneously, fault location on the insulator umbrella sheath generally can be accompanied by a certain amount of corona discharge, if can accurately detect the corona discharge on the insulator, so just can judge the quality of The Ageing of Insulators performance, thereby determine the state of the insulator of on-line operation, discovery as early as possible and deal with problems trouble-saving generation.
At present, the main method of on-line monitoring composite insulator generally is divided into contact detection and non-contact detection two classes both at home and abroad.The common issue with that traditional contact detection method exists has: interference problem is serious, operation inconvenience, and the human factor influence is bigger, and a lot of methods only are fit to porcelain insulator or glass insulator; But not contact method is in the trial stage at present, mainly contains by infrared observation insulator heating and utilizes ultraviolet imagery technology observation UV corona.Wherein, ultrared monitoring can only be confined to insulator and move late period, and general only responsive to insulator destruction, also is subjected to the influence of variation of ambient temperature easily.And ultraviolet imagery technology just grew up in recent years, was a kind ofly intuitively to demonstrate discharge scenario with the video image form, can effectively observe the imaging technique of corona discharge, but this commercial measurement accuracy was subject to the interference of environment.At present, for the quality testing of composite insulator, still lack the effective ways easy to implement of generally acknowledging.
Summary of the invention
In view of existing insulator Performance Detection technology above shortcomings, the invention provides a kind of insulator remote surface corona detection method and system based on image intensifer, it utilizes image intensifer to receive the ultraviolet radiation that corona produces, and be converted to electric signal, carry out analyzing and processing by computing machine again, quantitatively determine the discharge severe degree, provide the corona discharge indicator-specific statistics of quantification.
The present invention is based on the insulator remote surface corona detection method of image intensifer, comprise the steps:
A, make optics receive positioning system to aim at tested composite insulator one discharge position, obtain the ultraviolet signal of insulator, by image intensifer the ultraviolet signal that optics receives positioning system output is amplified, and be converted to electric signal along the faint discharge generation of face;
B, the electric signal that image intensifer is exported amplify, Filtering Processing is suitable electric signal, computing machine 5 adopt data acquisition modes to this electric signal gather, storage and analyzing and processing, quantitatively determine corona position and corona discharge severe degree, provide the corona discharge indicator-specific statistics of quantification.
Realize the composite insulator remote surface corona detection system of the inventive method, comprising:
Optics receives positioning system, makes it aim at tested composite insulator discharge position, receives corona discharge ultraviolet light and daylight;
Image intensifer, its input end connects the ultraviolet light output terminal that optics receives positioning system, is used for optics is received the ultraviolet signal amplification of positioning system output, and is converted to electric signal;
Amplify and collecting part, the electric signal that it exports image intensifer amplifies, Filtering Processing, and converts digital signal to; And,
Computing machine, it pass through interpretation software to from amplifying and processing such as counting and storage are gathered, analyzed to the signal of collecting part, quantitatively determine the corona position and the severe degree of discharging.
The present invention utilizes image intensifer to receive the ultraviolet radiation that tested composite insulator corona produces, and is converted to electric signal, carries out post analysis by computing machine again and finishes dealing with to the detection of corona, can quantitatively determine the discharge severe degree.
Actual test shows: total system is easy to carry, and is easy to operate; Testing process weak point consuming time; The result is accurate, and can the composition data storehouse.
Description of drawings
Fig. 1 is the structural representation of composite insulator remote surface corona detection system of the present invention;
Fig. 2 is the exemplary embodiments theory diagram of Fig. 1 corona detection system;
Fig. 3 receives the theory diagram of positioning system part for its optics;
Fig. 4 receives the index path that light path is separated in the positioning system part for Fig. 3 optics;
Fig. 5 is the analyzing software system main flow chart;
Fig. 6 is the data acquisition module process flow diagram;
Fig. 7 is the statistical computation process flow diagram of discharge pulse amplitude in the data analysis processing module and discharge time.
Embodiment
Below in conjunction with drawings and Examples principle of work of the present invention is described further.
Each several part among Fig. 1,2,3 is: the tested insulator of 1-, 2-optics receives localization part, 2.1-light-receiving head, 2.2-light path tripping device, 2.3-imaging location screening plant, 2.4-visualization device, the 3-image intensifer, 4-amplifies and collecting part, 4.1-prime amplifier, 4.2-the filtering part, 4.3-part of data acquisition, the Treatment Analysis of 5-terminal data and display part.
When the high-tension apparatus ionic discharge, according to the difference of electric field intensity (or High Pressure Difference), electric field intensity is above to a certain degree producing corona and then causing flashover or electric arc.In the ionization process, airborne electronics constantly obtains and releases energy.When electronics releases energy (i.e. discharge), can give off light wave and sound wave, also have the nitric acid of ozone, ultraviolet ray, trace etc.When corona took place, it was mainly ultraviolet light, and wavelength concentrates on 240～400nm, and light radiation intensity and corona intensity have close contact.The present invention adopts the image intensifer system that the ultraviolet light of this wave band is carried out long-range non-contact detection, to reach the purpose that detects corona.
Be that corona free produces when insulator is in normal condition, also promptly do not have the UV corona optical signal radiation.Along with the insulator dielectric performance descends, its surperficial faint discharge will occur and further develop, and ultraviolet signal is also by weak grow gradually.When the ultraviolet light that faint discharge is sent with image intensifer is surveyed, pulse waveform can appear when observing with oscillograph, and the amplitude of pulse and ultraviolet light intensity are directly proportional.The mode of pulse waveform and UV-light luminous (continuous light or pulsed light) is relevant.The electric impulse signal of ultraviolet light pulse signal and corona discharge also has direct corresponding relation, be that light pulse amplitude, number and electric pulse amplitude, number have direct linear relationship, therefore distribution of the umber of pulse of light pulse and pulse amplitude distribute and can reflect the development trend of discharge, can be used as the index of detection.By processing and analysis, just can detect the harm of the strong and weak and judgement of faint corona discharge to insulation to these indexs.
With reference to Fig. 1,2, composite insulator remote surface corona detection system of the present invention can comprise that optics receives positioning system 2, image intensifer 3, amplification and collecting part 4 and terminal 5.Optics receives positioning system 2, makes it aim at tested composite insulator 1 discharge position, receives corona discharge ultraviolet light and daylight; The input end of image intensifer 3 connects the ultraviolet light output terminal that optics receives positioning system 2, is used for optics is received the ultraviolet signal amplification of positioning system output, and is converted to electric signal; Amplification and collecting part 4 are used for electric signal amplification, the Filtering Processing with image intensifer output, and convert digital signal to; Terminal 5 to gather, analyze processing such as counting and storage from the signal of amplification and collecting part, is quantitatively determined corona position and discharge severe degree by interpretation software.
With reference to Fig. 3, optics accept positioning system 2 comprise receive 2.1, light path tripping device 2.2, imaging location screening plant 2.3 and visualization device 2.4.Wherein, light-receiving head 2.1 receives corona discharge ultraviolet light and daylight, and output is connected to light path tripping device 2.2; The optical imaging system that light path tripping device 2.2 passes through wherein is divided into two-way with the light that receives, and one tunnel output is connected to the input end of picture location screening plant 2.3, and another road output is connected to visualization device 2.4.Imaging location screening plant 2.3 positions according to image space, and its output terminal is connected to the input end of image intensifer 3; Visualization device is finished the imaging of measuring background.
The principle of light path separating part is with reference to Fig. 4, the UV corona light that insulator gives off has entered optics receiving positioner 2.2 with sunshine by receiving 2.1, wherein a part of light directly enters visual passage by illustrated flat mirror reflects, and visual passage is connected to visualization device 2.4 can direct visual imaging; Ultraviolet light and sunshine are also by imaging after the reflection of illustrated concave mirror and convex mirror in addition, in imaging place an imaging location screening plant 2.3 is arranged, it only can allow needs the ultraviolet light of measure portion to pass through, thereby can the particular location of required measurement insulator be positioned.
The signal that image intensifer 3 is obtained passes through to amplify and processing such as collecting part 4 amplifications, filtering and mould/transformation of variables, and input Computer Storage and analyzing and processing are quantitatively determined the severe degree of discharging.
Amplification and collecting part 4 comprise prime amplifier 4.1, filtering part 4.2 and data collecting card 4.3.Wherein, the input end of image intensifer 3 connects the output terminal (being the output terminal of imaging location screening plant 2.3) that optics receives positioning system 2, the input end of prime amplifier 4.1 connects the output terminal of image intensifer, the output terminal of prime amplifier 4.1 connects the input end of filtering part 4.2, the output terminal of filtering part connects data collecting card 4.2, and data collecting card 4.2 outputs connect the computing machine input port.
The terminal that output connects of image intensifer detection system can have dual mode, in the laboratory, need the workplaces such as scene of accumulation experimental data, adopt data collecting card to gather output signal, the input computing machine is carried out signal extraction, analyzes processing such as counting and data storage it by the software systems of moving on the computing machine.In work on the spot occasions such as transformer station, transmission lines of electricity, output can be connected to (as high performance digital oscilloscope) on the portable surveillance equipment, and data are shown to the tour personnel intuitively.
The analyzing software system that runs on the computing machine is formed data acquisition module, data analysis processing module and database module by three big modules.This analyzing software system can be accomplished:
1) provides the interface that capture card working method and state are set;
2) provide acquisition function to image intensifer pick-up unit output signal;
3) provide preservation and read functions to original experimental data;
4) provide preservation and read functions to the amplitude information that extracts;
5) provide original waveform and the Presentation Function of analyzing afterpulse counting, amplitude and amplitude distribution;
6) provide database management function to mass data.
With reference to Fig. 5, analysis software can have two kinds of running statuses, off-line data analysis and on-line monitoring.When off-line data is analyzed, after historical data called in, carry out data analysis and result's graphical demonstration automatically; During on-line monitoring, operations such as the initialization of advanced line correlation and hardware testing, real-time then image data is carried out the analysis and the graphical demonstration of data simultaneously.
Wherein, data acquisition module is with reference to Fig. 6, and program receives the relevant variable of gathering of beginning initialization after the acquisition, and the time period, cache size, threshold threshold value of sampling rate, the collection of capture card etc. are set.After end was set, program detected the internal trigger signal of capture card, gathered formally to begin.Program needs also to check whether the data of collection have reached the upper limit of buffer memory, and at any time the data in the buffer memory is sent, and the data after the collection are sent into database and preserved after threshold filtering and peak value maintenance.Said process circulates always and carries out finishing up to whole collection.
In the data analysis processing module, computing machine comes corona intensity is carried out quantification treatment according to the statistic of classification and the real time inspection discharge waveform of the big small magnitude of the detected ultraviolet light pulse of image intensifer, wherein, classified statistic method comprises: the 1) maximum amplitude of discharge in the statistics fixed time section; 2) add up the discharge time that surpasses certain threshold value in this time period; 3) calculate and show the corresponding relation between discharge amplitude and discharge time in this time period.
The statistical computation of discharge pulse amplitude and discharge time is with reference to Fig. 7 in the data analysis processing module, and this module is mainly finished following function: the 1) maximum amplitude of the statistics interior discharge of section sometime; 2) add up the interior discharge time that surpasses certain threshold value of section sometime; 3) calculate and show the corresponding relation between discharge amplitude and discharge time in the section sometime; 4) show the waveform of certain discharge.Wherein, discharge pulse amplitude and discharge time statistics use the software peak value to keep being realized, this process is according to the time period of the needs analysis of user's appointment and the sampled data of this time period, utilize the counting of counter and comparing back and forth successively of peak value, calculate at last and provide discharge amplitude and discharge time in this time period.Software systems can satisfy the requirement of different tests for the authority that the user provides the modification time section.
Database module, consider that raw data will constantly accumulate in actual applications, the structure of database module has adopted comparatively open way to manage, adopts the structure of " a shaft tower number insulator number-data ", forms a perfect fingerprint base and administers and maintains system.In actual applications, add, improved the expandability of system so greatly when the user can carry out data to corresponding rank when different ranks obtains new valuable data.Administering and maintaining of fingerprint base mainly is divided into foundation/deletion fingerprint base, checks, adds, deletes the discharge sample.
Simultaneously, above-mentioned software systems have very strong portability, and we can also select different computer systems for use according to the difference of test environment easily.Such as in laboratory study, can use high performance desktop computer instead, handle storage capacity with the data analysis of further raising system.These software systems also have extremely strong extensibility, therefore can finish function expansion in the very short time, apply to other association areas.
Test case: the corona micro discharge of a string 110kV composite insulator detects
When optics receives a certain discharge position of localization part 2 aligning composite insulators 1, if there is faint corona discharge this position, then highly sensitive image intensifer 3 just can capture the ultraviolet signal of discharge generation, after amplifying by 4.1 pairs of photocurrents of prime amplifier, can obtain bigger electric signal, pass through the processing of filtering part 4.2 again, so just can make signal be amplified to a suitable level, through part of data acquisition 4.3, be transferred to computing machine 5 again.Run on the analyzing software system on the computing machine, just can directly preserve and read, extract effective discharge information, the reduction original waveform original experimental data, show step-by-step counting, pulse extreme value and The extreme value distribution, and mass data is carried out the management of database.
The signal of 4.2 outputs of filtering part equally, can also be directly connected on the oscillograph.On oscillographic screen, if observe discharge waveform, then can reflect the strong and weak degree and the development trend of composite insulator micro discharge intuitively, realize detection to the little corona discharge of insulator.
The research of the technology of the present invention and use compound inslation sub-surface corona discharge under the corona discharge situation under the working voltage, working voltage is laid a good foundation to research topics such as the influence of insulation ag(e)ing and the defect analysiss of insulator interior microscopic.
Claims (8)
1, based on the insulator remote surface corona detection method of image intensifer, it is characterized in that comprising the steps:
A, make optics receive positioning system to aim at tested composite insulator one discharge position, obtain the ultraviolet signal of insulator, by image intensifer described ultraviolet signal is amplified, and be converted to electric signal along the faint discharge generation of face;
B, the electric signal that image intensifer is exported amplify, Filtering Processing is suitable electric signal, computing machine this electric signal is gathered, is stored and with umber of pulse, pulse maximum amplitude and amplitude distribution in the fixed time section be index to this electric signal analyzing and processing, quantitatively determine corona position and corona discharge severe degree.
2, detection method according to claim 1 is characterized in that described optics receives positioning system and comprises:
The light-receiving head is used to receive insulator corona discharge ultraviolet light and daylight;
Light path tripping device, its input connect the output of described light-receiving head, and the light that the optical imaging system by wherein will receive is divided into two-way output;
Imaging location screening plant, its input end are connected to one tunnel output of described light path tripping device, and output is connected to the input end of image intensifer, position according to image space, and filter out wherein ultraviolet light; And,
Visualization device, its input end are connected to another road output of described light path tripping device, are used to finish the imaging of measuring background.
3, detection method according to claim 1, it is characterized in that: computing machine comes corona intensity is carried out quantification treatment according to the statistic of classification and the real time inspection discharge waveform of the big small magnitude of the detected ultraviolet light pulse of image intensifer, wherein, classified statistic method comprises: the 1) maximum amplitude of discharge in the statistics fixed time section; 2) add up the discharge time that surpasses certain threshold value in this time period; 3) calculate and show the corresponding relation between discharge pulse amplitude and discharge time in this time period.
4, detection method according to claim 3, it is characterized in that: described discharge pulse amplitude and discharge time statistics are used software peak value maintenance method, this method is according to the time period of the needs analysis of user's appointment and the sampled data of this time period, utilize the counting of counter and comparing back and forth successively of peak value, calculate at last and provide discharge amplitude and discharge time in this time period.
5, realize the composite insulator remote surface corona detection system of each described detection method among the claim 1-4, it is characterized in that comprising:
Optics receives positioning system, makes it aim at tested composite insulator discharge position, receives corona discharge ultraviolet light and daylight;
Image intensifer, its input end connects the ultraviolet light output terminal that optics receives positioning system, is used for optics is received the ultraviolet light amplification of positioning system output, and is converted to electric signal;
Amplify and collecting part, the electric signal that it exports image intensifer amplifies, Filtering Processing, and converts digital signal to; And,
Computing machine, it to gather, analyze processing such as counting and storage from the signal of amplification and collecting part, is that index quantification determine corona position and discharge severe degree with umber of pulse, pulse maximum amplitude and amplitude distribution in the fixed time section by interpretation software.
6,, it is characterized in that described optics receives positioning system and comprises according to the composite insulator remote surface corona detection system of claim 5:
The light-receiving head is used to receive corona discharge ultraviolet light and daylight;
Light path tripping device, its input connect the output of described light-receiving head, and the light that the optical imaging system by wherein will receive is divided into two-way output;
Imaging location screening plant, its input end are connected to one tunnel output of described light path tripping device, and output is connected to the input end of image intensifer, position according to image space, and filter out wherein ultraviolet light; And,
Visualization device, its input end are connected to another road output of described light path tripping device, are used to finish the imaging of measuring background.
7, according to the composite insulator remote surface corona detection system of claim 5, it is characterized in that: described amplification and collecting part comprise prime amplifier, filtering part and data collecting card, the input end of prime amplifier connects the output terminal of image intensifer, the output terminal of prime amplifier connects the input end of filtering part, the output terminal of filtering part connects data collecting card, and data collecting card output connects the computing machine input port.
8, according to the composite insulator remote surface corona detection system of claim 5, it is characterized in that: described computing machine is the PC that has data collecting card.
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Cited By (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101852825A (en) * | 2010-05-21 | 2010-10-06 | 南方电网技术研究中心 | Wideband online measuring system for corona current of high-voltage transmission line |
| CN101852825B (en) * | 2010-05-21 | 2012-02-22 | 南方电网科学研究院有限责任公司 | Wideband online measuring system for corona current of high-voltage transmission line |
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