CN103792238A - Porcelain suspension type insulator fault diagnosis method - Google Patents
Porcelain suspension type insulator fault diagnosis method Download PDFInfo
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- CN103792238A CN103792238A CN201410045043.1A CN201410045043A CN103792238A CN 103792238 A CN103792238 A CN 103792238A CN 201410045043 A CN201410045043 A CN 201410045043A CN 103792238 A CN103792238 A CN 103792238A
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- 239000012212 insulator Substances 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 17
- 239000000725 suspension Substances 0.000 title claims abstract description 12
- 238000003745 diagnosis Methods 0.000 title abstract description 17
- 230000005856 abnormality Effects 0.000 claims abstract description 7
- 230000007547 defect Effects 0.000 claims description 26
- 238000009413 insulation Methods 0.000 claims description 17
- 238000001757 thermogravimetry curve Methods 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000002405 diagnostic procedure Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000001931 thermography Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 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
- 230000004069 differentiation Effects 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
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Abstract
The invention relates to a porcelain suspension type insulator fault diagnosis method. The method can realize the diagnosis of a faulty insulator by analyzing the temperature feature information of a porcelain suspension type insulator string. When the method is used for implementing diagnosis, the infrared thermal image spectrum of a certain number of the same types of insulator strings having no obvious abnormality can be collected on a to-be-detected site, so as to form the reference temperature feature information of the type insulator string of the detection site. Then the temperature feature information in the infrared thermal imaging spectrum of the to-be-diagnosed insulator string is extracted to compare with the reference temperature feature information, and the faulty insulator can be judged when no obvious difference exists. According to the porcelain suspension type insulator fault diagnosis method, the influence of the environment interference factor on the temperature feature of the insulator string can be eliminated, and the insulator fault diagnosis accuracy of the infrared thermal imaging method can be effectively improved. The porcelain suspension type insulator fault diagnosis method considers the difference of temperature feature difference of insulators at different positions, can realize diagnosis by comparing the temperature features of the same position of the similar equipment in the identical environment, and is applicable to the insulator fault diagnosis under various complicated conditions. The porcelain suspension type insulator fault diagnosis method can be conveniently applied on site.
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 main insulating element 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, be subject to electromechanical combination effect, the insulating property of insulator and mechanical property can slowly decline, thereby 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, represent that SI semi-insulation, by short circuit, has correspondingly increased probability of flashover.If the insulator chain generation power frequency flashover of defectiveness insulator or be struck by lightning, have very large electric current and flow through disordered insulator inside, the thermal effect that powerful electric current produces tends to cause suspension insulator steel cap burst or throw off, thereby occurs the major accidents such as insulator chain falls to go here and there, wire lands.
Find in power transmission and transforming equipment operation maintenance service technique field that as early as possible the performance degradation of insulator is the important leverage of power transmission and transforming equipment safe and stable operation, and be directly connected to the safety and stability of electrical network and the reliability to customer power supply.
At present, disordered insulator detects take voltage distribution as main, and infrared imaging method is auxiliary.But voltage distribution workload is huge, and poor stability, efficiency are low, therefore loss is high when practical application.Infrared thermal imagery method has the advantage that noncontact, security and testing efficiency are high, and due to the not good and criterion imperfection of insulator imaging effect, to cause detecting effect bad, therefore range of application is very limited, only carries out as a kind of supplementary means.The standard that infrared thermal imagery method insulator detects foundation is DL/T664-2008 " charging equipment infrared diagnosis technology application guide rule ".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, are subject to the impact of the factor such as environmental factor, surface filth, and the temperature difference of low, zero resistance insulator and normal insulation is less than 1K often, therefore cannot realize differentiation.
summary of the invention
The object of the invention is, introduce numerical analysis method, form a kind of new defects of insulator diagnostic method based on infrared thermal imagery principle, improve the accuracy rate of diagnosis that infrared thermal imagery method insulator detects.
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, to introduce numerical value analysis theories the defects of insulator based on infrared thermogram is diagnosed.First at the infrared thermogram of collection in worksite some to be detected Non Apparent Abnormality insulator chains of the same type, analyze the reference temperature characteristic information that forms this Test Field the type insulator chain.Then extract temperature profile information and the comparison of reference temperature characteristic information treated in diagnosing insulation substring infrared thermogram, carry out the defects of insulator diagnosis based on infrared thermogram according to numerical analysis theory, while having notable difference, 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 to be detected string Non Apparent Abnormality insulator chain, suppose that the total m in scene to be detected goes here and there porcelain suspension insulator string of the same type, 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, can suitably adjust according to field condition, and 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 in the short time trying one's best, and is basically identical to guarantee 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 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, can be also medial temperature or the maximum temperature of using image processing techniques to implement noise reduction, go to steel cap place after interfere information.Described insulator position refers to every insulator residing position in insulator chain, and after assigned direction, the Position Number of every insulator is unique.Described direction refers to that numbering initial is side of wire was or framework side.As certain insulator string totally 14 insulators, direction is side of wire was open numbering, and the Position Number of the first insulator of close side of wire was 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 is asked to 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 that comprises insulator positional information, and the dimension of vector is identical with insulator quantity.
(4) gather the infrared thermogram for the treatment of diagnosing insulation substring, then obtain by (2) described method the temperature for the treatment of diagnosing insulation substring, be and treat diagnosing insulation substring characteristic 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 (4) described insulator chain to be detected is subtracted to (3) described reference temperature characteristic information, obtain the defect diagonsis information of insulator to be detected.After described defect diagonsis information removal maximal value and minimum value, average and take advantage of 1.2 to obtain upper threshold value.After described defect diagonsis information removal maximal value and minimum value, average and take advantage of 0.8 to obtain lower threshold value.
(6) the defect diagonsis information of (5) described insulator to be detected is big or small with upper and lower threshold values.The insulator that defect diagonsis information is greater than threshold values information institute correspondence position can be judged as low resistance insulator, and the insulator that is less than lower threshold values information institute correspondence position can be judged as zero resistance insulator.
Advantage of the present invention is that the present invention can get rid of the temperature profile impact of environmental interference factor on insulator chain, effectively improves the accuracy of infrared thermal imagery method defects of insulator diagnosis.The present invention has considered the otherness of diverse location insulator temperature profile, and proposition is compared the temperature profile of same category of device same position under equivalent environment and realized diagnosis, is applicable to the defects of insulator diagnosis of various complex conditions.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
Further illustrate content of the present invention 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, as shown in Figure 1, every insulator string is containing 14 same model insulators for the type of 220kV insulator chain.From wire direction open numbering, be numbering 1 near the insulator of wire, all the other insulators are numbered since 2 up by that analogy.
Be below diagnostic procedure:
(1) obtain reference temperature characteristic information vector.This transformer station's the type insulator chain is totally 40 strings, therefore first gathered the infrared thermogram of 4 string Non Apparent Abnormality insulator chains, obtains steel cap place's maximum temperature opsition dependent and asks and obtained reference temperature characteristic information vector (unit for degree Celsius) after 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) gather the temperature profile information vector for the treatment of diagnosing insulation substring.Collection, after the infrared thermogram of diagnosing insulation, is obtained the maximum temperature at every insulator steel cap place, obtains 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) generate defect diagonsis information vector.The temperature profile information vector b of insulator chain to be detected is subtracted to 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 near the 1st insulator of side of wire was be zero resistance insulator;
C8=2.08>H, judges that near the 8th insulator of side of wire was be 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 the defects of insulator based on infrared thermogram is diagnosed; The step of described method is:
(1), at the infrared thermogram of collection in worksite n to be detected string Non Apparent Abnormality insulator chain, if the total m in scene to be detected goes here and there porcelain suspension insulator string of the same type, n meets the following conditions:
0.1 × m<n<0.5 × m, and n>2;
(2) every 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 the described n insulator string of step (2) same position insulator steel cap is asked to arithmetic mean, is the reference temperature characteristic information of this Test Field the type insulator chain;
(4) gather the infrared thermogram for the treatment of diagnosing insulation substring, then obtain by the described method of step (2) temperature for the treatment of diagnosing insulation substring, for treating diagnosing insulation substring characteristic information;
(5) the temperature profile information of the described insulator chain to be detected of step (4) is subtracted to the described reference temperature characteristic information of step (3), obtain the defect diagonsis information of insulator to be detected; After described defect diagonsis information removal maximal value and minimum value, average and take advantage of 1.2 to obtain upper threshold value; After described defect diagonsis information removal maximal value and minimum value, average and take advantage of 0.8 to obtain lower threshold value;
(6) the defect diagonsis information of the described insulator to be detected of step (5) is big or small with upper and lower threshold values; The insulator that defect diagonsis information is greater than threshold values information institute correspondence position can be judged as low resistance insulator; The insulator that is less than lower threshold values information institute correspondence position can be judged as zero resistance insulator.
2. porcelain suspended insulator defect diagnostic method according to claim 1, 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 can be medial temperature or the maximum temperature at steel cap place, can be also medial temperature or the maximum temperature of using image processing techniques to implement noise reduction, go to 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 every insulator residing position in insulator chain, and after assigned direction, the Position Number of every insulator is unique; Described direction refers to that numbering initial is side of wire was or framework side.
4. porcelain suspended insulator defect diagnostic method according to claim 1, 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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| CN104267063A (en) * | 2014-10-10 | 2015-01-07 | 国家电网公司 | Low-value insulator detection method based on infrared thermography |
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| CN110703055A (en) * | 2019-10-31 | 2020-01-17 | 三峡大学 | Infrared detection method for zero-value insulator |
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| CN112444522A (en) * | 2020-11-16 | 2021-03-05 | 中国科学院沈阳自动化研究所 | Method for detecting defects of insulator string of power system |
| CN113884500A (en) * | 2021-10-12 | 2022-01-04 | 国家电网有限公司 | Porcelain insulator defect detection method based on ultraviolet imaging |
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| CN115825667A (en) * | 2022-12-06 | 2023-03-21 | 广州科易光电技术有限公司 | Insulator string detection method, electronic device, and storage medium |
| CN115825667B (en) * | 2022-12-06 | 2023-10-13 | 广州科易光电技术有限公司 | Insulator string detection method, electronic equipment and storage medium |
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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 |