阅读说明：本技术 一种特高压瓷质绝缘子串铁帽温度曲线拼接方法及系统 (Method and system for splicing temperature curves of string iron caps of ultra-high voltage porcelain insulators ) 是由 周学明 胡丹晖 卢萍 尹骏刚 马建国 姚建刚 周玎 雷成华 冯志强 毛晓坡 付剑 于 2020-12-04 设计创作，主要内容包括：本发明提供了一种特高压瓷质绝缘子串铁帽温度曲线拼接方法及系统。所述方法包括以下步骤：获取包含瓷质绝缘子串导线端与接地端特征的分段红外图像；分别提取每段红外图像中每片瓷质绝缘子的铁帽温度,并绘制出每段红外图像中的分段温度曲线；找出每条瓷质绝缘子分段温度曲线在瓷质绝缘子串中对应的绝缘子片；将不同段瓷质绝缘子分段温度曲线中对应的相同瓷质绝缘子片的温度曲线进行融合,生成融合温度曲线；将不同段瓷质绝缘子分段温度曲线中对应的不相同瓷质绝缘子的温度曲线进行拼接；将融合温度曲线和拼接温度曲线融合成完整的瓷质绝缘子串温度曲线。本发明解决了特高压大吨位瓷绝缘子串身过长导致单张红外热像图谱无法包含整串特征的问题。(The invention provides a method and a system for splicing temperature curves of an ultra-high voltage porcelain insulator chain iron cap. The method comprises the following steps: acquiring a segmented infrared image containing the characteristics of the lead end and the grounding end of the porcelain insulator string; respectively extracting the temperature of the iron cap of each porcelain insulator in each infrared image, and drawing a segmented temperature curve in each infrared image; finding out corresponding insulator sheets of each porcelain insulator subsection temperature curve in the porcelain insulator string; fusing corresponding temperature curves of the same porcelain insulator piece in the subsection temperature curves of different sections of porcelain insulators to generate a fused temperature curve; splicing corresponding temperature curves of different porcelain insulators in the segmented temperature curves of different sections of porcelain insulators; and fusing the fusion temperature curve and the splicing temperature curve into a complete temperature curve of the porcelain insulator string. The method solves the problem that a single infrared thermal image spectrum cannot contain the characteristics of a whole string due to the fact that the body of the extra-high voltage large-tonnage porcelain insulator is too long.)

1. The method for splicing the temperature curves of the string iron caps of the ultra-high voltage porcelain insulators is characterized by comprising the following steps of:

the method comprises the following steps: acquiring segmented infrared images of the same porcelain insulator string;

step two: respectively extracting the temperature of the iron cap of each porcelain insulator in each infrared image, and drawing a porcelain insulator segmented temperature curve in each infrared image;

step three: finding out corresponding insulator sheets of each porcelain insulator subsection temperature curve in the porcelain insulator string;

step four: fusing corresponding temperature curves of the overlapped parts of the same porcelain insulator pieces in the subsection temperature curves of different sections of porcelain insulators to generate a fused temperature curve;

step five: splicing corresponding non-overlapping part temperature curves of different porcelain insulators in the subsection temperature curves of different sections of porcelain insulators;

step six: and fusing the fused temperature curve and the spliced temperature curve into a complete temperature curve of the porcelain insulator string.

2. The method for splicing the temperature curves of the sub-string and iron cap of the ultra-high voltage porcelain insulator according to claim 1, wherein the method comprises the following steps: the method comprises the following steps that the first step of obtaining the subsection infrared images of the same porcelain insulator string comprises two parts, one part comprises the conductor end characteristic of the porcelain insulator string, the other part comprises the ground end characteristic of the porcelain insulator string in series connection, and the porcelain insulator pieces contained in the subsection infrared images of the two porcelain insulator strings are partially overlapped.

3. The method for splicing the temperature curves of the sub-string and the iron cap of the ultra-high voltage porcelain insulator according to claim 1 or 2, wherein the method comprises the following steps: and in the second step, the temperature of the iron cap of the porcelain insulator in each section of infrared image is extracted by using a machine vision technology or a manual detection method, and a sectional temperature curve of the porcelain insulator in each section of infrared image is drawn.

4. The method for splicing the temperature curves of the sub-string and iron cap of the ultra-high voltage porcelain insulator according to claim 2, wherein the method comprises the following steps: porcelain insulator segmented temperature curve T of segmented infrared images of two same porcelain insulator strings₁And T₂The method comprises the following specific steps of fusing temperature curves corresponding to the overlapped parts of the same porcelain insulator sheet:

(1) calculating the sectional temperature curve T of the porcelain insulator according to a formula₁And T₂N corresponding to the same insulator piece_pThe calculation formula is as follows:

n_p＝n₁+n₂-n①

in the formula, n₁、n₂Are respectively bagsThe number of insulator pieces in two infrared images containing the conductor end characteristics of the porcelain insulator string and the ground end characteristics of the porcelain insulator string in series connection is n, and n is the total number of insulator pieces of the porcelain insulator string;

(2) calculating the sectional temperature curve T of the porcelain insulator according to the formulas 2 and III₁And T₂Corresponding n_pFusion temperature T of each insulator in same insulator_ciAnd draw n_pFusion temperature curve T of sheet-like insulator_c：

In the formula, T_1,iIs n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₁A temperature value of (1);

T_2,iis n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₂A temperature value of (1);

η_iis a weighting coefficient, and η is an edge attenuation factor;

n_pfor porcelain insulator subsection temperature curve T₁And T₂The number of corresponding identical insulator pieces in (a);

i is n of overlap_pThe sequence of the porcelain insulator pieces to be calculated in the same insulator is determined.

5. The method for splicing the temperature curves of the iron caps of the ultra-high voltage ceramic insulator strings according to claim 2 or 4, wherein the method is characterized in that the porcelain insulator segmented temperature curves T of two segments of segmented infrared images of the same ceramic insulator string₁And T₂The non-overlapping temperature curves of the corresponding different porcelain insulator sheets are spliced, and the splicing process is as follows:

(1) respectively calculating the sectional temperature curve T of the porcelain insulator according to a formula IV and a formula V₁And T₂By a deviation factor d₁And d₂The calculation formula is as follows:

in the formula, T_c1Taking a value for the 1 st porcelain insulator in the fusion temperature curve; n is₁The number of the porcelain insulators contained in the porcelain insulator segmented temperature curve S1 is counted;for porcelain insulator subsection temperature curve T₁The value of the first porcelain insulator positioned in the overlapping area is taken;the value of the last porcelain insulator in the fusion temperature curve is taken,for porcelain insulator subsection temperature curve T₂The value of the last porcelain insulator positioned in the overlapping area is taken; n is_pFor porcelain insulator subsection temperature curve T₁And T₂N corresponding to the same insulator piece_p；

(2) Calculating the sectional temperature curve T of the porcelain insulator by the following offset formulas (sixth) and (seventh)₁And T₂Temperature value T of non-overlapping portions of corresponding different insulator sheets_1’And T_2’Correcting to obtain a porcelain insulator segmented temperature curve T₁And T₂Temperature offset value T of non-overlapping portion_d1And T_d2And drawing a porcelain insulator segmented temperature curve T₁And T₂A curve of temperature offset values for non-overlapping portions;

T_d1＝T_1'+d₁ ⑥

T_d2＝T_2'+d₂ ⑦

in the formula: d₁And d₂Respectively is a porcelain insulator subsection temperature curve T₁And T₂The offset coefficient of (a);

T_1’and T_2’Respectively two segmented temperature curves T₁And T₂The temperature values of the corresponding different insulator pieces;

(3) according to the fusion temperature curve T_cSectional temperature curve T of porcelain insulator₁Offset curve T of_d1Segmental temperature curve T of porcelain insulator₂Offset curve T of_d2The numerical values in the three groups of data are spliced through a formula to obtain complete temperature curve data T of the porcelain insulator string:

T＝[T_d1,T_c,T_d2] ⑧

T_cporcelain insulator subsection temperature curve T₁And T₂The fusion curve of (1);

T_d1porcelain insulator subsection temperature curve T₁The offset curve of (a);

T_d2porcelain insulator subsection temperature curve T₂The offset curve of (2).

6. The method for splicing the temperature curves of the sub-string and iron cap of the ultra-high voltage porcelain insulator according to claim 3, wherein the method comprises the following steps: the machine vision techniques include image recognition algorithms or feature extraction algorithm methods.

7. The utility model provides an extra-high voltage porcelain insulator chain iron cap temperature curve splicing system which characterized in that, splicing system includes:

the segmented infrared image acquisition module is used for acquiring segmented infrared images of the same ceramic insulator string;

the temperature extraction and curve drawing module is used for preprocessing each section of collected infrared image, extracting the temperature of each section of infrared image cap and drawing a porcelain insulator segmented temperature curve in each section of infrared image;

the insulator piece searching module is used for searching out the insulator piece corresponding to each porcelain insulator subsection temperature curve in the porcelain insulator string;

the curve fusion module is used for fusing corresponding temperature curves of the overlapped parts of the same porcelain insulator pieces in the subsection temperature curves of different sections of porcelain insulators to generate a fusion temperature curve;

the curve splicing module is used for splicing corresponding non-overlapping part temperature curves of different porcelain insulators in the subsection temperature curves of different sections of porcelain insulators;

and the integration module is used for fusing the fused temperature curve and the spliced temperature curve into a complete ceramic insulator string temperature curve.

8. The system of claim 7, wherein the system comprises: the segmented infrared image acquisition module is used for acquiring two segmented infrared images of the same porcelain insulator string, wherein one segmented infrared image comprises the wire end characteristics of the porcelain insulator string, and the other segmented infrared image comprises the ground end characteristics of the porcelain insulator string connected in series.

9. The system of claim 8, wherein the system comprises: the curve fusion module is used for carrying out segmentation on the porcelain insulator segmented temperature curve T of the segmented infrared images of two same porcelain insulator strings₁And T₂The method comprises the following specific steps of fusing temperature curves corresponding to the overlapped parts of the same porcelain insulator sheet:

(1) calculating the sectional temperature curve T of the porcelain insulator according to a formula₁And T₂N corresponding to the same insulator piece_pThe calculation formula is as follows:

n_p＝n₁+n₂-n①

in the formula, n₁、n₂The number of insulator pieces in two infrared images respectively including the wire end characteristic of the porcelain insulator string and the ground end characteristic of the porcelain insulator string in series connectionN is the total number of insulators of the porcelain insulator string;

(2) calculating the sectional temperature curve T of the porcelain insulator according to the formulas 2 and III₁And T₂Corresponding n_pFusion temperature T of each insulator in same insulator_ciAnd draw n_pFusion temperature curve T of sheet-like insulator_c：

In the formula, T_1,iIs n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₁A temperature value of (1);

T_2,iis n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₂A temperature value of (1);

η_iis a weighting coefficient, and η is an edge attenuation factor;

n_pfor porcelain insulator subsection temperature curve T₁And T₂The number of corresponding identical insulator pieces in (a);

i is n of overlap_pThe sequence of the porcelain insulator pieces to be calculated in the same insulator is determined.

10. The system according to claim 8 or 9, wherein the curve splicing module is used for splicing the ceramic insulator subsection temperature curve T of the subsection infrared images of two sections of the same ceramic insulator string₁And T₂The non-overlapping temperature curves of the corresponding different porcelain insulator sheets are spliced, and the splicing process is as follows:

(1) respectively calculating the porcelain insulators according to a formula IV and a formula VSegmented temperature curve T₁And T₂By a deviation factor d₁And d₂The calculation formula is as follows:

in the formula, T_c1Taking a value for the 1 st porcelain insulator in the fusion temperature curve; n is₁The number of the porcelain insulators contained in the porcelain insulator segmented temperature curve S1 is counted;for porcelain insulator subsection temperature curve T₁The value of the first porcelain insulator positioned in the overlapping area is taken;the value of the last porcelain insulator in the fusion temperature curve is taken,for porcelain insulator subsection temperature curve T₂The value of the last porcelain insulator positioned in the overlapping area is taken; n is_pFor porcelain insulator subsection temperature curve T₁And T₂N corresponding to the same insulator piece_p；

(2) Calculating the sectional temperature curve T of the porcelain insulator by the following offset formulas (sixth) and (seventh)₁And T₂Temperature value T of non-overlapping portions of corresponding different insulator sheets_1’And T_2’Correcting to obtain a porcelain insulator segmented temperature curve T₁And T₂Temperature offset value T of non-overlapping portion_d1And T_d2And drawing a porcelain insulator segmented temperature curve T₁And T₂A curve of temperature offset values for non-overlapping portions;

T_d1＝T_1'+d₁ ⑥

T_d2＝T_2'+d₂ ⑦

in the formula: d₁And d₂Respectively is a porcelain insulator subsection temperature curve T₁And T₂The offset coefficient of (a);

T_1’and T_2’Respectively two segmented temperature curves T₁And T₂The temperature values of the corresponding different insulator pieces;

(3) according to the fusion temperature curve T_cSectional temperature curve T of porcelain insulator₁Offset curve T of_d1Segmental temperature curve T of porcelain insulator₂Offset curve T of_d2The numerical values in the three groups of data are spliced through a formula to obtain complete temperature curve data T of the porcelain insulator string:

T＝[T_d1,T_c,T_d2] ⑧

T_cporcelain insulator subsection temperature curve T₁And T₂The fusion curve of (1);

T_d1porcelain insulator subsection temperature curve T₁The offset curve of (a);

T_d2porcelain insulator subsection temperature curve T₂The offset curve of (2).

Technical Field

The invention relates to the technical field of ultra-high voltage large-tonnage porcelain insulator detection, in particular to an iron cap temperature curve splicing method and system for ultra-high voltage large-tonnage long-string porcelain insulator infrared characteristic analysis.

Background

The porcelain insulator is a common electrical insulation device and is widely applied to transmission lines and transformer substations of various voltage grades. In the long-term operation process, the insulator string is influenced by various complex factors such as strong electromechanical load, acid rain, strong wind, ice coating, ultraviolet rays, dirt, temperature and humidity drastic changes and the like, the insulating property and the mechanization property of the insulator can be gradually reduced, and therefore the degradation fault of a zero value or low value insulator is generated. The existence of the low-zero-value insulator can possibly cause phenomena of partial discharge, flashover, even burst, string drop and the like, and great threat is formed to the safe and stable operation of the power grid.

With the continuous development of the ultrahigh voltage power transmission and transformation technology in China, the application of the ultrahigh voltage large-tonnage porcelain insulator in a power system is more and more common. Compared with a conventional high-voltage insulator, the ultrahigh-voltage large-tonnage insulator string is longer, the installation height is larger, the insulation margin is smaller, and the electric field distribution is more complex. Therefore, more and more attention is paid to the deterioration detection of the extra-high voltage large-tonnage porcelain insulator.

At present, the detection method of the low zero value of the porcelain insulator is mainly divided into two types. One is an electric quantity detection method: mainly including a spark gap method, an insulation resistance method, a voltage distribution method, a leakage current method, and the like. When the methods are used for detection, the manual operation difficulty is high, the risk is high, the efficiency is low, and false detection and missing detection are easily caused. The other is a non-electric quantity detection method: mainly comprises an infrared thermal imaging method, an ultraviolet imaging method, an ultrasonic method and the like. Among them, the infrared thermography is the most commonly used non-contact charged detection method. The principle is that the deteriorated insulator iron cap is judged according to the characteristic that the deteriorated insulator iron cap presents different temperature rises compared with the adjacent normal insulator iron cap (also called an iron cap temperature difference threshold method). In the process of on-site operation and maintenance, the positive and negative 1K temperature difference at the iron cap specified in the electric power industry standard DL/T664-2016 electrified equipment infrared diagnosis application specification is commonly used as the judgment basis for low and zero value insulator infrared detection.

When an infrared thermal imager provided with a standard lens is used for shooting an extra-high voltage long string of insulators, the whole string of insulators are difficult to completely and clearly shoot in one infrared image due to a long distance, and the problem that a single infrared image cannot contain the characteristics of the whole string exists; if a long-focus lens is adopted, even if the whole string of insulators can be shot in the same image, the sufficient image resolution cannot be guaranteed, so that the infrared feature extraction difficulty is extremely high, and the insulator degradation diagnosis analysis is not facilitated.

Disclosure of Invention

The invention aims to provide a method and a system for splicing the temperature curves of iron caps of ultra-high voltage porcelain insulator strings for ultra-high voltage large-tonnage long-string porcelain insulators.

In order to achieve the technical purpose, the technical scheme provided by the invention is a method for splicing the temperature curves of the iron caps of the ultra-high voltage porcelain insulator strings, which is characterized by comprising the following specific steps of:

the method comprises the following steps: acquiring segmented infrared images of the same porcelain insulator string;

step two: respectively extracting the temperature of the iron cap of each porcelain insulator in each infrared image, and drawing a porcelain insulator segmented temperature curve in each infrared image;

step three: finding out corresponding insulator sheets of each porcelain insulator subsection temperature curve in the porcelain insulator string;

step four: fusing corresponding temperature curves of the overlapped parts of the same porcelain insulator pieces in the subsection temperature curves of different sections of porcelain insulators to generate a fused temperature curve;

step five: splicing corresponding non-overlapping part temperature curves of different porcelain insulators in the subsection temperature curves of different sections of porcelain insulators;

step six: and fusing the fused temperature curve and the spliced temperature curve into a complete temperature curve of the porcelain insulator string.

The further technical scheme of the invention is as follows: : the method comprises the following steps that the first step of obtaining the subsection infrared images of the same porcelain insulator string comprises two parts, one part comprises the conductor end characteristic of the porcelain insulator string, the other part comprises the ground end characteristic of the porcelain insulator string in series connection, and the porcelain insulator pieces contained in the subsection infrared images of the two porcelain insulator strings are partially overlapped. .

The invention has the following excellent technical scheme: : and in the second step, the temperature of the iron cap of the porcelain insulator in each section of infrared image is extracted by using a machine vision technology or a manual detection method, and a sectional temperature curve of the porcelain insulator in each section of infrared image is drawn.

The further technical scheme of the invention is as follows: porcelain insulator segmented temperature curve T of segmented infrared images of two same porcelain insulator strings₁And T₂The method comprises the following specific steps of fusing temperature curves corresponding to the overlapped parts of the same porcelain insulator sheet:

(1) calculating the sectional temperature curve T of the porcelain insulator according to a formula₁And T₂N corresponding to the same insulator piece_pThe calculation formula is as follows:

n_p＝n₁+n₂-n①

in the formula, n₁、n₂The number of insulator pieces in two infrared images respectively including the wire end characteristic of the porcelain insulator string and the ground end characteristic of the porcelain insulator string in series connection, and n is the total number of insulator pieces of the porcelain insulator string;

(2) calculating the sectional temperature curve T of the porcelain insulator according to the formulas 2 and III₁And T₂Corresponding n_pFusion temperature T of each insulator in same insulator_ciAnd draw n_pFusion temperature curve T of sheet-like insulator_c：

In the formula, T_1,iIs n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₁A temperature value of (1);

T_2,iis n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₂A temperature value of (1);

η_iis a weighting coefficient, and η is an edge attenuation factor;

n_pfor porcelain insulator subsection temperature curve T₁And T₂The number of corresponding identical insulator pieces in (a);

i is n of overlap_pThe sequence of the porcelain insulator pieces to be calculated in the same insulator is determined.

The further technical scheme of the invention is as follows: porcelain insulator segmented temperature curve T of segmented infrared images of two same porcelain insulator strings₁And T₂The non-overlapping temperature curves of the corresponding different porcelain insulator sheets are spliced, and the splicing process is as follows:

(1) respectively calculating the sectional temperature curve T of the porcelain insulator according to a formula IV and a formula V₁And T₂By a deviation factor d₁And d₂The calculation formula is as follows:

in the formula, T_c1Taking a value for the 1 st porcelain insulator in the fusion temperature curve; n is₁The number of the porcelain insulators contained in the porcelain insulator segmented temperature curve S1 is counted;for porcelain insulator subsection temperature curve T₁The value of the first porcelain insulator positioned in the overlapping area is taken;the value of the last porcelain insulator in the fusion temperature curve is taken,for porcelain insulator subsection temperature curve T₂The value of the last porcelain insulator positioned in the overlapping area is taken; n is_pFor porcelain insulator subsection temperature curve T₁And T₂N corresponding to the same insulator piece_p；

(2) Calculating the sectional temperature curve T of the porcelain insulator by the following offset formulas (sixth) and (seventh)₁And T₂Temperature value T of non-overlapping portions of corresponding different insulator sheets_1’And T_2’Correcting to obtain a porcelain insulator segmented temperature curve T₁And T₂Temperature offset value T of non-overlapping portion_d1And T_d2And drawing out the porcelain insulator

Segmented temperature curve T of rim₁And T₂A curve of temperature offset values for non-overlapping portions;

T_d1＝T_1'+d₁ ⑥

T_d2＝T_2'+d₂ ⑦

in the formula: d₁And d₂Respectively is a porcelain insulator subsection temperature curve T₁And T₂The offset coefficient of (a);

T_1’and T_2’Respectively two segmented temperature curves T₁And T₂The temperature values of the corresponding different insulator pieces;

(3) according to the fusion temperature curve T_cSectional temperature curve T of porcelain insulator₁Offset curve T of_d1Segmental temperature curve T of porcelain insulator₂Offset curve T of_d2The numerical values in the three groups of data are spliced through a formula to obtain complete temperature curve data T of the porcelain insulator string:

T＝[T_d1,T_c,T_d2] ⑧

T_cporcelain insulator subsection temperature curve T₁And T₂The fusion curve of (1);

T_d1porcelain insulator subsection temperature curve T₁The offset curve of (a);

T_d2porcelain insulator subsection temperature curve T₂The offset curve of (2).

The invention has the following excellent technical scheme: the machine vision techniques include image recognition algorithms or feature extraction algorithm methods.

In order to achieve the technical purpose, the invention also provides a system for splicing the temperature curves of the string iron caps of the ultra-high voltage porcelain insulator, which is characterized by comprising the following components:

the segmented infrared image acquisition module is used for acquiring segmented infrared images of the same ceramic insulator string;

the temperature extraction and curve drawing module is used for preprocessing each section of collected infrared image, extracting the temperature of each section of infrared image cap and drawing a porcelain insulator segmented temperature curve in each section of infrared image;

the insulator piece searching module is used for searching out the insulator piece corresponding to each porcelain insulator subsection temperature curve in the porcelain insulator string;

the curve fusion module is used for fusing corresponding temperature curves of the overlapped parts of the same porcelain insulator pieces in the subsection temperature curves of different sections of porcelain insulators to generate a fusion temperature curve;

the curve splicing module is used for splicing corresponding non-overlapping part temperature curves of different porcelain insulators in the subsection temperature curves of different sections of porcelain insulators;

and the integration module is used for fusing the fused temperature curve and the spliced temperature curve into a complete ceramic insulator string temperature curve.

The further technical scheme of the invention is as follows: the segmented infrared image acquisition module is used for acquiring two segmented infrared images of the same porcelain insulator string, wherein one segmented infrared image comprises the wire end characteristics of the porcelain insulator string, and the other segmented infrared image comprises the ground end characteristics of the porcelain insulator string connected in series.

The further technical scheme of the invention is as follows: the curve fusion module is used for carrying out segmentation on the porcelain insulator segmented temperature curve T of the segmented infrared images of two same porcelain insulator strings₁And T₂The method comprises the following specific steps of fusing temperature curves corresponding to the overlapped parts of the same porcelain insulator sheet:

(1) calculating the sectional temperature curve T of the porcelain insulator according to a formula₁And T₂N corresponding to the same insulator piece_pThe calculation formula is as follows:

n_p＝n₁+n₂-n①

in the formula, n₁、n₂The number of insulator pieces in two infrared images respectively including the wire end characteristic of the porcelain insulator string and the ground end characteristic of the porcelain insulator string in series connection, and n is the total number of insulator pieces of the porcelain insulator string;

(2) calculating the sectional temperature curve T of the porcelain insulator according to the formulas 2 and III₁And T₂Corresponding n_pFusion temperature T of each insulator in same insulator_ciAnd draw n_pFusion temperature curve T of sheet-like insulator_c：

In the formula, T_1,iIs n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₁A temperature value of (1);

T_2,iis n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₂A temperature value of (1);

η_iis a weighting coefficient, and η is an edge attenuation factor;

n_pfor porcelain insulator subsection temperature curve T₁And T₂The number of corresponding identical insulator pieces in (a);

i is n of overlap_pThe sequence of the porcelain insulator pieces to be calculated in the same insulator is determined.

The further technical scheme of the invention is as follows: the curve splicing module is used for carrying out sectional temperature curve T on the porcelain insulators of the sectional infrared images of the two sections of the same porcelain insulator string₁And T₂The non-overlapping temperature curves of the corresponding different porcelain insulator sheets are spliced and the splicing is carried outThe process of (2) is as follows:

(1) respectively calculating the sectional temperature curve T of the porcelain insulator according to a formula IV and a formula V₁And T₂By a deviation factor d₁And d₂The calculation formula is as follows:

in the formula, T_c1Taking a value for the 1 st porcelain insulator in the fusion temperature curve; n is₁The number of the porcelain insulators contained in the porcelain insulator segmented temperature curve S1 is counted;for porcelain insulator subsection temperature curve T₁The value of the first porcelain insulator positioned in the overlapping area is taken;the value of the last porcelain insulator in the fusion temperature curve is taken,for porcelain insulator subsection temperature curve T₂The value of the last porcelain insulator positioned in the overlapping area is taken; n is_pFor porcelain insulator subsection temperature curve T₁And T₂N corresponding to the same insulator piece_p；

(2) Calculating the sectional temperature curve T of the porcelain insulator by the following offset formulas (sixth) and (seventh)₁And T₂Temperature value T of non-overlapping portions of corresponding different insulator sheets_1’And T_2’Correcting to obtain a porcelain insulator segmented temperature curve T₁And T₂Temperature offset value T of non-overlapping portion_d1And T_d2And drawing a porcelain insulator segmented temperature curve T₁And T₂A curve of temperature offset values for non-overlapping portions;

T_d1＝T_1'+d₁ ⑥

T_d2＝T_2'+d₂ ⑦

in the formula: d₁And d₂Respectively is a porcelain insulator subsection temperature curve T₁And T₂The offset coefficient of (a);

T_1’and T_2’Respectively two segmented temperature curves T₁And T₂The temperature values of the corresponding different insulator pieces;

(3) according to the fusion temperature curve T_cSectional temperature curve T of porcelain insulator₁Offset curve T of_d1Segmental temperature curve T of porcelain insulator₂Offset curve T of_d2The numerical values in the three groups of data are spliced through a formula to obtain complete temperature curve data T of the porcelain insulator string:

T＝[T_d1,T_c,T_d2] ⑧

T_cporcelain insulator subsection temperature curve T₁And T₂The fusion curve of (1);

T_d1porcelain insulator subsection temperature curve T₁The offset curve of (a);

T_d2porcelain insulator subsection temperature curve T₂The offset curve of (2).

Compared with the existing insulator infrared detection technology with the voltage class of 220kV or below, the invention creatively provides algorithms of multi-graph splicing, data fusion and the like, can effectively solve the problem that a single infrared thermal image graph cannot contain the whole string of characteristics due to the overlong body of the extra-high voltage large-tonnage ceramic insulator string, and has higher technical advancement and wide applicability.

Drawings

FIG. 1 is a flow chart of a method of the present invention;

FIG. 2 is a system block diagram of the present invention;

FIGS. 3 and 4 are the splicing process of two temperature profiles in the example;

FIG. 5 is a sectional temperature curve T of the porcelain insulator in two infrared images in the embodiment₁And T₂；

Fig. 6 is a temperature curve of the completed porcelain insulator string in the example.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the method for splicing the temperature curves of the string iron caps of the ultra-high voltage ceramic insulator provided by the invention specifically comprises the following steps:

the method comprises the following steps: acquiring a segmented infrared image containing the characteristics of the wire end of a porcelain insulator string and the ground end of a porcelain insulator string connected in series;

step two: respectively extracting the temperature of the iron cap of each porcelain insulator in each infrared image, and drawing a porcelain insulator segmented temperature curve in each infrared image;

step three: finding out corresponding insulator sheets of each porcelain insulator subsection temperature curve in the porcelain insulator string;

step four: fusing corresponding temperature curves of the overlapped parts of the same porcelain insulator pieces in the subsection temperature curves of different sections of porcelain insulators to generate a fused temperature curve;

step four: splicing corresponding non-overlapping part temperature curves of different porcelain insulators in the subsection temperature curves of different sections of porcelain insulators;

step five: and fusing the fused temperature curve and the spliced temperature curve into a complete temperature curve of the porcelain insulator string.

The method for splicing the temperature curves of the iron caps of the ultra-high voltage ceramic insulator strings in the embodiment specifically comprises the step of splicing the temperature curves of the iron caps of the ultra-high voltage ceramic insulator strings by using segmented infrared images of two same ceramic insulator strings, wherein one of the segmented infrared images contains the wire end characteristics of the ceramic insulator strings, the other segmented infrared image contains the ground end characteristics of the ceramic insulator strings, and the two ceramic insulator stringsThe number of ceramic insulator pieces contained in the segmented infrared images of the substrings is partially overlapped, and the segmented infrared images of the two ceramic insulator strings contain all the ceramic insulator pieces; extracting the temperature of the iron cap of each porcelain insulator in the two infrared images by using a machine vision technology, and drawing a porcelain insulator segmented temperature curve T in the two infrared images₁And T₂(ii) a The machine vision technology for extracting the insulator temperature characteristic curve in the infrared image comprises an image recognition algorithm, a characteristic extraction algorithm or a manual detection method. The specific process of fusing and splicing the two sections of segmented temperature curves of the porcelain insulator is as follows:

(1) calculating the sectional temperature curve T of the porcelain insulator according to a formula₁And T₂N corresponding to the same insulator piece_pThe calculation formula is as follows:

n_p＝n₁+n₂-n①

in the formula, n₁、n₂The number of insulator pieces in two infrared images respectively including the wire end characteristic of the porcelain insulator string and the ground end characteristic of the porcelain insulator string in series connection, and n is the total number of insulator pieces of the porcelain insulator string;

(2) calculating the sectional temperature curve T of the porcelain insulator according to the formulas 2 and III₁And T₂Corresponding n_pFusion temperature T of each insulator in same insulator_ciAnd draw n_pFusion temperature curve T of sheet-like insulator_c：

In the formula, T_1,iIs n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₁A temperature value of (1);

T_2,iis n of overlap_pSegmented temperature curve T of ith insulator in same insulator in porcelain insulator₂A temperature value of (1);

η_iis a weighting coefficient, and η is an edge attenuation factor;

n_pfor porcelain insulator subsection temperature curve T₁And T₂The number of corresponding identical insulator pieces in (a);

i is n of overlap_pThe sequence of the porcelain insulator pieces to be calculated in the same insulator is determined.

(3) Respectively calculating the sectional temperature curve T of the porcelain insulator according to a formula IV and a formula V₁And T₂By a deviation factor d₁And d₂The calculation formula is as follows:

in the formula, T_c1Taking a value for the 1 st porcelain insulator in the fusion temperature curve; n is₁The number of the porcelain insulators contained in the porcelain insulator segmented temperature curve S1 is counted;for porcelain insulator subsection temperature curve T₁The value of the first porcelain insulator positioned in the overlapping area is taken;the value of the last porcelain insulator in the fusion temperature curve is taken,for porcelain insulator subsection temperature curve T₂The value of the last porcelain insulator positioned in the overlapping area is taken; n is_pFor porcelain insulator subsection temperature curve T₁And T₂N corresponding to the same insulator piece_p；

(4) Calculating the sectional temperature curve T of the porcelain insulator by the following offset formulas (sixth) and (seventh)₁And T₂Temperature value T of non-overlapping portions of corresponding different insulator sheets_1’And T_2’Correcting to obtain a porcelain insulator segmented temperature curve T₁And T₂Temperature offset value T of non-overlapping portion_d1And T_d2And drawing a porcelain insulator segmented temperature curve T₁And T₂A curve of temperature offset values for non-overlapping portions;

T_d1＝T_1'+d₁ ⑥

T_d2＝T_2'+d₂ ⑦

in the formula: d₁And d₂Respectively is a porcelain insulator subsection temperature curve T₁And T₂The offset coefficient of (a);

T_1’and T_2’Respectively two segmented temperature curves T₁And T₂The temperature values of the corresponding different insulator pieces;

(5) according to the fusion temperature curve T_cSectional temperature curve T of porcelain insulator₁Offset curve T of_d1Segmental temperature curve T of porcelain insulator₂Offset curve T of_d2The numerical values in the three groups of data are spliced through a formula to obtain complete temperature curve data T of the porcelain insulator string:

T＝[T_d1,T_c,T_d2] ⑧

T_cporcelain insulator subsection temperature curve T₁And T₂The fusion curve of (1);

T_d1porcelain insulator subsection temperature curve T₁The offset curve of (a);

T_d2porcelain insulator subsection temperature curve T₂The offset curve of (2).

As shown in fig. 2, the system for splicing the temperature curves of the string iron caps of the ultra-high voltage ceramic insulator provided by the invention is characterized by comprising:

the segmented infrared image acquisition module is used for acquiring a segmented infrared image containing the characteristics of the wire end of the porcelain insulator string and the ground end of the porcelain insulator string connected in series;

the temperature extraction and curve drawing module is used for preprocessing each section of collected infrared image, extracting the temperature of each section of infrared image cap and drawing a porcelain insulator segmented temperature curve in each section of infrared image;

the insulator piece searching module is used for searching out the insulator piece corresponding to each porcelain insulator subsection temperature curve in the porcelain insulator string;

the curve fusion module is used for fusing corresponding temperature curves of the overlapped parts of the same porcelain insulator pieces in the subsection temperature curves of different sections of porcelain insulators to generate a fusion temperature curve;

the curve splicing module is used for splicing corresponding non-overlapping part temperature curves of different porcelain insulators in the subsection temperature curves of different sections of porcelain insulators;

and the integration module is used for fusing the fused temperature curve and the spliced temperature curve into a complete ceramic insulator string temperature curve.

The temperature curve splicing method in the invention is further explained by combining a specific embodiment, wherein the porcelain insulator string in the embodiment is a certain 1000kV power transmission line insulator string, the insulator string comprises 54 porcelain insulators with the same type, all the characteristics of the porcelain insulators cannot be contained in the same infrared image because the insulator string is an extra-high voltage large-tonnage long string porcelain insulator, in order to obtain a complete porcelain insulator string temperature curve through two different infrared images, the splicing method is adopted for splicing, the specific splicing process is as shown in fig. 3 and fig. 4, and the specific steps are as follows:

(1) acquiring two infrared thermal image spectrums which respectively comprise the head characteristics and the tail characteristics of the porcelain insulator string and have the number of pieces exceeding the total number of pieces of the insulator string by 4 through the same porcelain insulator string;

(2) extracting the temperature of the iron cap of each porcelain insulator in the two infrared images respectively by using a machine vision technology, and drawing a porcelain insulator iron cap temperature distribution curve T in the two infrared images of the same insulator string₁And T₂Two-section porcelain insulator subsection temperatureCurve T₁And T₂As shown in particular in fig. 5; the machine vision technology for extracting the insulator temperature characteristic curve in the infrared image comprises an image recognition algorithm, a characteristic extraction algorithm or a manual detection method;

(3) corresponding insulator pieces of each porcelain insulator segmented temperature curve in the porcelain insulator string in the figure 5, and then finding out the corresponding overlapping part temperature values of the same porcelain insulator pieces in the two segmented temperature curves, wherein the segmented temperature curve T₁The data in the overlap region are:

27.198

27.248

27.274

27.242

27.33

27.348

27.348

27.442

segmented temperature curve T₂The data in the overlap region are:

26.782

26.624

26.648

26.548

26.606

26.538

26.608

26.396

(4) calculating the sectional temperature curve T of the porcelain insulator according to the formulas 2 and III₁And T₂Corresponding n_pFusion temperature T of each insulator in same insulator_ci：

Taking two groups of data in the step (3), and carrying out operation by formula II and formula III to obtain T_ciThe values are as follows:

26.99

26.936

26.961

26.895

26.968

26.943

26.978

26.919

in the above calculation, the attenuation factor is set to 1, and each η_iThe values are all equal to 1; and drawing a fusion temperature curve T according to the calculated numerical value_c；

(5) Substituting the calculated values into a formula (IV) and a formula (V) to respectively calculate the sectional temperature curve T of the porcelain insulator₁And T₂By a deviation factor d₁And d₂The calculation formula is as follows:

calculated d thereof₁＝0.208；d₂＝0.523；

Porcelain insulator subsection temperature curve T₁The curve data in the non-overlapping region are as follows:

27.7

27.534

27.36

27.202

27.158

27.25

27.21

27.152

27.15

27.168

27.114

27.02

27.152

27.134

27.044

26.988

27.038

27.056

27.17

27.274

27.212

porcelain insulationSub-segment temperature curve T₂The curve data in the non-overlapping region are as follows:

26.274

26.292

26.224

26.286

26.25

26.164

26.114

26.076

26.076

26.198

26.174

26.198

26.25

26.34

26.43

26.504

26.434

26.632

26.608

26.66

26.736

26.658

26.728

26.816

26.65

adding the data to corresponding offset values respectively to obtain an offset curve:

(6) calculating the sectional temperature curve T of the porcelain insulator by the following offset formulas (sixth) and (seventh)₁And T₂Temperature value T of non-overlapping portions of corresponding different insulator sheets_1’And T_2’Correcting to obtain a porcelain insulator segmented temperature curve T₁And T₂Temperature offset value T of non-overlapping portion_d1And T_d2，

T_d1＝T_1'+d₁ ⑥

T_d2＝T_2'+d₂ ⑦

Porcelain insulator subsection temperature curve T₁Offset curve values in non-overlapping regions:

T_d1：

27.492

27.326

27.152

26.994

26.95

27.042

27.002

26.944

26.942

26.96

26.906

26.812

26.944

26.926

26.836

26.78

26.83

26.848

26.962

27.066

27.004

porcelain insulator subsection temperature curve T₁Offset curve values in non-overlapping regions:

T_d2：

26.797

26.815

26.747

26.809

26.773

26.687

26.637

26.599

26.599

26.721

26.697

26.721

26.773

26.863

26.953

27.027

26.957

27.155

27.131

27.183

27.259

27.181

27.251

27.339

27.173

(7) according to the fusion temperature curve T in the step (4)_cAnd the value T in step (6)_d1，T_d2Three groups of data are expressed by the formula T ═ T_d1,T_c,T_d2]And splicing to form a complete ceramic insulator string full string iron cap temperature distribution curve, as shown in fig. 6.

The edge attenuation factor is formed by the fact that the reliability of the value of the edge attenuation factor is reduced because the feature is close to the edge of the image. In the two infrared thermal image spectrums, the characteristics of the insulator string are continued to the edge of the image. The reasonable setting of the edge attenuation factor can give consideration to the characteristic information of the overlapping area of the two infrared images, so that the temperature curve after fusion splicing can be stably and excessively overlapped without losing the characteristics.

According to the invention, the whole string of temperature characteristics of the insulator string are obtained through two local infrared characteristic images of the same string of porcelain insulators, and the problem that a single infrared image cannot contain the whole string of characteristics is solved.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.