CN103792238B - A kind of porcelain suspended insulator defect diagnostic method - Google Patents
A kind of porcelain suspended insulator defect diagnostic method Download PDFInfo
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- 239000012212 insulator Substances 0.000 title claims abstract description 125
- 230000007547 defect Effects 0.000 title claims abstract description 30
- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 14
- 238000002405 diagnostic procedure Methods 0.000 title claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000001757 thermogravimetry curve Methods 0.000 claims abstract description 17
- 230000005856 abnormality Effects 0.000 claims abstract description 7
- 239000000725 suspension Substances 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000003745 diagnosis Methods 0.000 abstract description 11
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
A kind of porcelain suspended insulator defect diagnostic method, the method realizes the diagnosis of Faulty insulator by the temperature profile information analyzing porcelain suspension insulator string.Application the method needs when implementing diagnosis first at the infrared thermogram of collection in worksite some to be detected Non Apparent Abnormality insulator chains of the same type, forms the reference temperature characteristic information of this Test Field the type insulator chain.Then extract and treat that the temperature profile information in diagnosing insulation substring infrared thermogram compares with reference temperature characteristic information, have during notable difference and can be judged as disordered insulator.The present invention can get rid of environmental interference factor to be affected the temperature profile of insulator chain, effectively improves the accuracy of infrared thermal imagery method defects of insulator diagnosis.Contemplated by the invention the otherness of diverse location insulator temperature profile, propose to compare the temperature profile of same category of device same position under equivalent environment and realize diagnosis, be applicable to the defects of insulator diagnosis of various complex condition.The present invention can facilitate application at the scene.
Description
Technical field
The present invention relates to a kind of defects of insulator diagnostic method, belong to high-tension power transmission and transformation equipment operation maintenance service technique field.
Background technology
Porcelain suspended insulator (calling insulator in the following text) is the primary insulation parts in electrical network, plays the effect of mechanical support simultaneously.In the complex environment that operating insulator long-term work coexists in highfield, mechanical stress, filth and weather extremes etc.Along with the increase of working time, by electromechanical combination effect, the insulating property of insulator and mechanical property can slowly decline, thus produce low resistance insulator (insulator resistance is between 10 megaohms and 500 megaohms) or zero resistance insulator (insulator resistance is less than 10 megaohms).Null value or low resistance insulator are referred to as disordered insulator.If defectiveness insulator occurs in an insulator string, then represent that SI semi-insulation is shorted, and correspondingly increases probability of flashover.If the insulator chain generation power frequency flashover of defectiveness insulator or be struck by lightning, have very big current and flow through disordered insulator inside, the thermal effect that powerful electric current produces often causes suspension insulator steel cap burst or throw off, thus occurs the major accidents such as insulator chain falls string, wire lands.
Find that the performance degradation of insulator is the important leverage of power transmission and transforming equipment safe and stable operation as early as possible in power transmission and transforming equipment operation maintenance service technique field, and be directly connected to the safety and stability of electrical network and the reliability to customer power supply.
At present, disordered insulator detects based on voltage's distribiuting method, and infrared imaging method is auxiliary.But voltage's distribiuting method workload is huge, and poor stability, efficiency are low, therefore during practical application, loss is high.Infrared thermal imagery method has the advantage that noncontact, security and testing efficiency are high, and because insulator imaging effect is not good and criterion imperfection causes Detection results bad, therefore range of application is very limited, only carries out as a kind of supplementary means.The standard of infrared thermal imagery method isolator detecting foundation is DL/T664-2008 " charging equipment infrared diagnosis technology application directive/guide ".This standard proposes, and operating low value insulation is higher than the sub-temperature of normal insulation, and the normal insulator of zero resistance insulator temperature correction is low, and criterion is temperature difference 1K.Actual conditions are, by the impact of the factor such as environmental factor, surface filth, the temperature difference of low, zero resistance insulator and normal insulation is less than 1K often, therefore cannot realize differentiating.
Summary of the invention
The object of the invention is, introduce numerical analysis method, form a kind of defects of insulator diagnostic method based on infrared thermal imagery principle newly, improve the accuracy rate of diagnosis of infrared thermal imagery method isolator detecting.
The invention discloses a kind of defects of insulator diagnostic method based on Infrared Thermography Technology.
Technical scheme of the present invention is, by analyzing the temperature profile information of porcelain suspension insulator string, introducing numerical value analysis theories and diagnosing the defects of insulator based on infrared thermogram.First at the infrared thermogram of collection in worksite some to be detected Non Apparent Abnormality insulator chains of the same type, the reference temperature characteristic information forming this Test Field the type insulator chain is analyzed.Then extract and treat that the temperature profile information in diagnosing insulation substring infrared thermogram compares with reference temperature characteristic information, diagnose according to the theoretical defects of insulator carried out based on infrared thermogram of numerical analysis, have during notable difference and can be judged as disordered insulator.
Detection method of the present invention comprises the following steps:
(1) at the infrared thermogram of collection in worksite n string Non Apparent Abnormality insulator chain to be detected, suppose that scene to be detected has m and goes here and there porcelain suspension insulator string of the same type, then advise that n meets the following conditions: 0.1*m<n<0.5*m, and n>2.The alternative condition of described n is not fixing, and suitably can adjust according to field condition, in certain scope, n is larger, and accuracy rate of diagnosis is higher.
The judgment principle of described Non Apparent Abnormality is that Temperature Distribution trend is identical with the Temperature Distribution trend of most of insulator chain of this collection in worksite.The collecting work of the infrared thermogram of described n string Non Apparent Abnormality insulator chain should complete within the as far as possible short time, is basically identical to ensure that the infrared thermogram of every insulator string gathers environmental baseline.Described porcelain suspension insulator string of the same type refers to that string appearance is same, and insulator type is identical.
(2) extract every sheet insulator steel cap place temperature in (1) described insulator chain infrared thermogram, preserve by insulator position.Described insulator steel cap place temperature can be medial temperature or the maximum temperature at steel cap place, also can be to use image processing techniques to implement noise reduction, go medial temperature or the maximum temperature at steel cap place after interfere information.Described insulator position refers to the position that every sheet insulator is residing in insulator chain, and after assigned direction, the Position Number of every sheet insulator is unique.Described direction refers to that numbering initial is side of wire or framework side.As certain insulator string totally 14 insulators, direction is side of wire open numbering, then the Position Number near the first insulator of side of wire is 1, and last a slice Position Number is 14.
(3) obtain reference temperature after the temperature of described to (2) n insulator string same position insulator steel cap being asked arithmetic mean, be referred to as the reference temperature characteristic information of this Test Field the type insulator chain.Described reference temperature characteristic information is a proper vector comprising insulator positional information, and the dimension of vector is identical with insulator quantity.
(4) gather the infrared thermogram treating diagnosing insulation substring, then obtain by (2) described method the temperature treating diagnosing insulation substring, be and treat diagnosing insulation substring characteristics information.Describedly treat that diagnosing insulation substring temperature profile information is one and comprises positional information proper vector, the dimension of vector is identical with insulator quantity.
(5) the temperature profile information of described to (4) insulator chain to be detected is subtracted (3) described reference temperature characteristic information, obtain the defect diagonsis information of insulator to be detected.Described defect diagonsis information is averaged after removing maximal value and minimum value and is taken advantage of 1.2 to obtain upper threshold value.Described defect diagonsis information is averaged after removing maximal value and minimum value and is taken advantage of 0.8 to obtain lower threshold value.
(6) the defect diagonsis information of described to (5) insulator to be detected is compared size with upper and lower threshold values.The insulator that defect diagonsis information is greater than position corresponding to threshold values information can be judged as low resistance insulator, and the insulator being less than position corresponding to lower threshold values information can be judged as zero resistance insulator.
Advantage of the present invention is, the present invention can get rid of environmental interference factor to be affected the temperature profile of insulator chain, effectively improves the accuracy of infrared thermal imagery method defects of insulator diagnosis.Contemplated by the invention the otherness of diverse location insulator temperature profile, propose to compare the temperature profile of same category of device same position under equivalent environment and realize diagnosis, be applicable to the defects of insulator diagnosis of various complex condition.The present invention is workable, and rig-site utilization is convenient.
Accompanying drawing explanation
Fig. 1 is on-the-spot insulator schematic diagram; In figure: 1 is framework, 2 is wire, and 3 is insulator chain.
Embodiment
Content of the present invention is further illustrated below in conjunction with drawings and Examples.
Embodiment:
The infrared thermal imagery method that certain 220kV transformer station carries out 220kV insulator chain in station detects, and in this Substation Station, the type of 220kV insulator chain as shown in Figure 1, and every insulator string is containing 14 same model insulators.From wire direction open numbering, the insulator namely near wire is numbering 1, all the other insulators numbering from 2 up by that analogy.
Be below diagnostic procedure:
(1) reference temperature characteristic information vector is obtained.This transformer station's the type insulator chain is totally 40 strings, therefore first acquires the infrared thermogram of 4 string Non Apparent Abnormality insulator chains, obtains steel cap place's maximum temperature and opsition dependent obtains reference temperature characteristic information vector (unit for degree Celsius) after asking arithmetic evaluation:
a=[9.34,8.74,8.26,7.78,7.54,7.42,7.42,7.42,7.66,7.78,8.02,8.14,8.26,7.06]
(2) the temperature profile information vector treating diagnosing insulation substring is gathered.Gather after the infrared thermogram of diagnosing insulation, obtain the maximum temperature at every sheet insulator steel cap place, obtain treating diagnosing insulation substring temperature profile information vector:
b=[9.4,10.1,9.8,9.4,9.3,9.1,9.0,9.5,9.3,9.4,9.5,9.6,9.8,8.7]
(3) defect diagonsis information vector is generated.The temperature profile information vector b of insulator chain to be detected is subtracted reference temperature characteristic information vector a, is defect diagonsis information vector:
c=[c1,c2…,c14]
=[0.06,1.36,1.54,1.62,1.76,1.68,1.58,2.08,1.64,1.62,1.48,1.46,1.54,1.64]
Therefore upper threshold value:
H=[sum(c1,c2…,c14)-max(c1,c2…,c14)-min(c1,c2…,c14)]/12*1.2=1.89
Lower threshold value:
L=[sum(c1,c2…,c14)-max(c1,c2…,c14)-min(c1,c2…,c14)]/12*0.8=1.26
(4) defect diagonsis:
C1=0.06<L, judges that close side of wire the 1st insulator is zero resistance insulator;
C8=2.08>H, judges that close side of wire the 8th insulator is low resistance insulator.
Claims (4)
1. a porcelain suspended insulator defect diagnostic method, is characterized in that, described method, by analyzing the temperature profile information of porcelain suspension insulator string, is introduced numerical value analysis theories and diagnosed the defects of insulator based on infrared thermogram; The step of described method is:
(1) go here and there the infrared thermogram of Non Apparent Abnormality insulator chain at collection in worksite n to be detected, if scene to be detected has m go here and there porcelain suspension insulator string of the same type, then n meets the following conditions:
0.1 × m<n<0.5 × m, and n>2;
(2) every sheet insulator steel cap place temperature in the described insulator chain infrared thermogram of extraction step (1), preserves by insulator position;
(3) obtaining reference temperature after the temperature of step (2) described n insulator string same position insulator steel cap being asked arithmetic mean, is the reference temperature characteristic information of this Test Field the type insulator chain;
(4) gathering the infrared thermogram treating diagnosing insulation substring, then obtaining the temperature treating diagnosing insulation substring, for treating diagnosing insulation substring characteristics information by the described method of step (2);
(5) the temperature profile information of described for step (4) insulator chain to be detected is subtracted the described reference temperature characteristic information of step (3), obtain the defect diagonsis information of insulator to be detected; Described defect diagonsis information is averaged after removing maximal value and minimum value and is taken advantage of 1.2 to obtain upper threshold value; Described defect diagonsis information is averaged after removing maximal value and minimum value and is taken advantage of 0.8 to obtain lower threshold value;
(6) the defect diagonsis information of described for step (5) insulator to be detected is compared size with upper and lower threshold values; The insulator that defect diagonsis information is greater than position corresponding to threshold values information can be judged as low resistance insulator; The insulator being less than position corresponding to lower threshold values information can be judged as zero resistance insulator.
2. porcelain suspended insulator defect diagnostic method according to claim 1, it is characterized in that, the temperature profile information of described insulator chain refers to the temperature information at insulator steel cap place; The temperature at described insulator steel cap place is medial temperature or the maximum temperature at steel cap place, or uses image processing techniques to implement noise reduction, goes medial temperature or the maximum temperature at steel cap place after interfere information.
3. porcelain suspended insulator defect diagnostic method according to claim 1, it is characterized in that, described step (2) insulator position refers to the position that every sheet insulator is residing in insulator chain, and after assigned direction, the Position Number of every sheet insulator is unique; Described direction refers to that numbering initial is side of wire or framework side.
4. porcelain suspended insulator defect diagnostic method according to claim 1, it is characterized in that, the insulation resistance of described low resistance insulator is between 10 megaohms and 500 megaohms; The insulation resistance of described zero resistance insulator is less than 10 megaohms.
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Effective date of registration: 20161010 Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. Patentee after: State Grid Corporation of China Patentee after: State's net Jiangxi Province Electric power Science Academe Patentee after: Kecheng High-New Technology Development Co., Jiangxi Address before: 100761 West Chang'an Avenue, Beijing, No. 86, No. Patentee before: State Grid Corporation of China Patentee before: State's net Jiangxi Province Electric power Science Academe |