CN113947040A - Volume distribution coefficient-based method for analyzing uneven dirt accumulation on upper and lower surfaces of insulator - Google Patents

Volume distribution coefficient-based method for analyzing uneven dirt accumulation on upper and lower surfaces of insulator Download PDF

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CN113947040A
CN113947040A CN202111195114.2A CN202111195114A CN113947040A CN 113947040 A CN113947040 A CN 113947040A CN 202111195114 A CN202111195114 A CN 202111195114A CN 113947040 A CN113947040 A CN 113947040A
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insulator
pollution
distribution
dirt
volume fraction
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CN113947040B (en
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张志劲
王继来
蒋兴良
王强
乔新涵
李景坤
胡建林
林志海
胡琴
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Chongqing University
China Railway First Survey and Design Institute Group Ltd
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China Railway First Survey and Design Institute Group Ltd
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Abstract

The invention provides a volume distribution coefficient-based method for analyzing uneven dirt accumulation on the upper and lower surfaces of an insulator, which comprises the following steps: s1, collecting pollution accumulation parameters of an insulator of a target power transmission line and preprocessing the pollution accumulation parameters; s2, inputting the pretreated pollution accumulation parameters into hydrodynamics calculation software to determine the volume fraction v of the distribution of the upper surface pollution particles of the insulator of the target power transmission lineusAnd the volume fraction v of the distribution of the lower surface dirt particlesls(ii) a S3, distributing volume fraction v according to dirt particles on the upper surface of the insulatorusAnd the volume fraction v of the distribution of the lower surface dirt particleslsDetermining the unevenness k of the upper surface and the lower surface of the target insulator at the ith momenti(ii) a S4, according to the unevenness k of the ith momentiDetermining that the target insulator is in the setAnd determining the dirt unevenness k in the dirt accumulation period, and accurately determining the dirt unevenness state on the surface of the insulator.

Description

Volume distribution coefficient-based method for analyzing uneven dirt accumulation on upper and lower surfaces of insulator
Technical Field
The invention relates to an analysis method for power equipment, in particular to an analysis method for uneven dirt accumulation on the upper surface and the lower surface of an insulator based on a volume distribution coefficient.
Background
With the rapid growth of urban and rural economy, the atmospheric environmental pollution in China is becoming more and more serious. The heavy pollution plants are moved to suburbs from urban centers and a great number of rural enterprises which use coal as main energy sources appear, and the smoke tubes of the plants are increased, so that the industrial pollution spread area is rapidly enlarged; the rapid development of highway construction, the great increase of traffic flow and the density of road networks all lead to the aggravation of the exhaust emission pollution of motor vehicles.
The insulator is one of the most important devices in the power network, the dirt accumulation on the surface of the insulator is increasingly serious due to the reasons, the insulator frequently generates flashover accidents due to the dirt accumulation, the flashover accidents related to the dirt are related to the dirt degree and the uneven dirt accumulation of the insulator, but the difficulty in on-site measurement of the uneven accumulated dirt on the upper surface and the lower surface of the insulator is high, and a large amount of manpower and material resources are consumed.
Therefore, in order to solve the above technical problems, it is necessary to provide a new technical means.
Disclosure of Invention
In view of the above, the present invention provides a volume distribution coefficient-based method for analyzing uneven contamination on the upper and lower surfaces of an insulator, which fully considers the contamination environment parameters of the region where the target power transmission line is located, and can accurately determine the contamination unevenness state on the surface of the insulator, thereby facilitating accurate evaluation of the contamination state of the insulator and accurately making corresponding processing measures.
The invention provides a volume distribution coefficient-based method for analyzing uneven dirt accumulation on the upper and lower surfaces of an insulator, which comprises the following steps:
s1, collecting pollution accumulation parameters of an insulator of a target power transmission line and preprocessing the pollution accumulation parameters, wherein the pollution accumulation parameters comprise pollution particle concentration, particle size and wind speed;
s2, inputting the pretreated pollution accumulation parameters into hydrodynamics calculation software to determine the volume fraction v of the distribution of the upper surface pollution particles of the insulator of the target power transmission lineusAnd the volume fraction v of the distribution of the lower surface dirt particlesls；
S3, distributing volume fraction v according to dirt particles on the upper surface of the insulatorusAnd the volume fraction v of the distribution of the lower surface dirt particleslsDetermining the unevenness k of the upper surface and the lower surface of the target insulator at the ith momenti；
S4, according to the unevenness k of the ith momentiAnd determining the dirt unevenness k of the target insulator in a set dirt accumulation period.
Further, in step S3, the unevenness k at the ith time is determined according to the following methodi：
Figure BDA0003300050060000021
Wherein v isusiThe volume fraction of the distribution of the dirt particles on the upper surface of the insulator at the ith moment; v. oflsiThe volume fraction of the distribution of the dirt particles on the lower surface of the insulator at the ith moment.
Further, in step S4, the contamination unevenness k of the target insulator in the set contamination period is determined by the following method:
Figure BDA0003300050060000022
wherein s is1Is the target insulator upper surface area, s2Is the lower surface of the target insulatorAnd n is n times of the set fouling period division.
Further, in step S1, the fouling parameter is preprocessed by the following method:
finding out the maximum value and the minimum value of the pollution accumulation parameters of the same category, and solving the range difference of the pollution accumulation parameters of the category;
inputting the range difference into a ROUNDUP function of Excel to obtain the grouping condition of the fouling parameters of the same category;
and calculating probability distribution values of different grouped data by adopting a maximum likelihood estimation algorithm, and obtaining a 50% probability distribution value of the pollution accumulation parameter in the category in unit time.
The invention has the beneficial effects that: according to the method and the device, the pollution environment parameters of the area where the target power transmission line is located are fully considered, and the pollution unevenness state on the surface of the insulator can be accurately determined, so that the pollution state of the insulator can be accurately evaluated, and corresponding treatment measures can be accurately taken.
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The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic diagram of a volume fraction simulation result of the upper and lower surfaces of the insulator.
Detailed Description
The invention is described in further detail below with reference to the drawings of the specification:
the invention provides a volume distribution coefficient-based method for analyzing uneven dirt accumulation on the upper and lower surfaces of an insulator, which comprises the following steps:
s1, collecting pollution accumulation parameters of an insulator of a target power transmission line and preprocessing the pollution accumulation parameters, wherein the pollution accumulation parameters comprise pollution particle concentration, particle size and wind speed;
s2, inputting the pretreated pollution accumulation parameters into hydrodynamics calculation software to determine the volume fraction v of the distribution of the upper surface pollution particles of the insulator of the target power transmission lineusAnd the volume fraction v of the distribution of the lower surface dirt particlesls(ii) a Wherein, the fluid mechanics calculation software adopts fluent softwareBefore calculation, geometric models of a target insulator and a reference standard insulator are imported into the software, and the volume fraction v of the distribution of the dirt particles on the upper surface of the insulator at the ith moment is calculated by the softwareusiAnd the distribution volume fraction v of the filthy particles on the lower surface of the insulator at the ith momentlsi；
S3, distributing volume fraction v according to dirt particles on the upper surface of the insulatorusAnd the volume fraction v of the distribution of the lower surface dirt particleslsDetermining the unevenness k of the upper surface and the lower surface of the target insulator at the ith momenti；
S4, according to the unevenness k of the ith momentiAnd determining the contamination nonuniformity k of the target insulator in a set contamination period, and by the method, fully considering the contamination environment parameters of the region where the target power transmission line is located, and accurately determining the contamination nonuniformity state on the surface of the insulator, thereby being beneficial to accurately evaluating the contamination nonuniformity state of the insulator and accurately making corresponding treatment measures.
Specifically, the method comprises the following steps: in step S3, the unevenness k at the ith time is determined in accordance with the following methodi：
Figure BDA0003300050060000041
Wherein v isusiThe volume fraction of the distribution of the dirt particles on the upper surface of the insulator at the ith moment; v. oflsiThe volume fraction of the distribution of the dirt particles on the lower surface of the insulator at the ith moment.
In step S4, determining the contamination unevenness k of the target insulator in the set contamination period by the following method:
Figure BDA0003300050060000042
wherein s is1Is the target insulator upper surface area, s2The method is used for accurately obtaining the dirt deposition unevenness of the target insulator, wherein the lower surface area of the target insulator is n, and n is n moments for setting the dirt deposition period division.
In this embodiment, in step S1, the contamination deposition parameter is preprocessed by the following method:
finding out the maximum value and the minimum value of the pollution accumulation parameters of the same category, and solving the range difference of the pollution accumulation parameters of the category;
inputting the range difference into a ROUNDUP function of Excel to obtain the grouping condition of the fouling parameters of the same category;
and calculating probability distribution values of different grouped data by adopting a maximum likelihood estimation algorithm, and obtaining a 50% probability distribution value of the pollution accumulation parameter of the category in unit time.
The calculation error re of the method is shown as follows by taking the atmospheric environment pollution monitoring data in a certain area and the actually measured uneven pollution accumulation data on site as an example.
Figure BDA0003300050060000051
In the embodiment, the relative error of the calculated ash density value of the method for analyzing the uneven dirt deposition on the upper surface and the lower surface of the insulator based on the volume distribution coefficient is between 5.2% and 17.3%. By comparing the volume distribution coefficient-based uneven pollution accumulation analysis method test and the actual measurement result, the relative error between the upper surface and the lower surface of the insulator can be found to be in a reasonable range.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (4)

1. A volume distribution coefficient-based method for analyzing uneven dirt accumulation on the upper and lower surfaces of an insulator is characterized by comprising the following steps: the method comprises the following steps:
s1, collecting pollution accumulation parameters of an insulator of a target power transmission line and preprocessing the pollution accumulation parameters, wherein the pollution accumulation parameters comprise pollution particle concentration, particle size and wind speed;
s2, inputting the pretreated pollution accumulation parameters into hydrodynamics calculation software to determine the volume fraction v of the distribution of the upper surface pollution particles of the insulator of the target power transmission lineusAnd the volume fraction v of the distribution of the lower surface dirt particlesls；
S3, distributing volume fraction v according to dirt particles on the upper surface of the insulatorusAnd the volume fraction v of the distribution of the lower surface dirt particleslsDetermining the unevenness k of the upper surface and the lower surface of the target insulator at the ith momenti；
S4, according to the unevenness k of the ith momentiAnd determining the dirt unevenness k of the target insulator in a set dirt accumulation period.
2. The method for analyzing uneven contamination on the upper and lower surfaces of the insulator based on the volume distribution coefficient as claimed in claim 1, wherein: in step S3, the unevenness k at the ith time is determined in accordance with the following methodi：
Figure FDA0003300050050000011
Wherein v isusiThe volume fraction of the distribution of the dirt particles on the upper surface of the insulator at the ith moment; v. oflsiThe volume fraction of the distribution of the dirt particles on the lower surface of the insulator at the ith moment.
3. The method for analyzing uneven contamination on the upper and lower surfaces of the insulator based on the volume distribution coefficient as claimed in claim 2, wherein: in step S4, determining the contamination unevenness k of the target insulator in the set contamination period by the following method:
Figure FDA0003300050050000021
wherein s is1Is the target insulator upper surface area, s2And n is n moments for dividing the set fouling period.
4. The method for analyzing uneven contamination on the upper and lower surfaces of the insulator based on the volume distribution coefficient as claimed in claim 1, wherein: in step S1, the fouling parameter is preprocessed by the following method:
finding out the maximum value and the minimum value of the pollution accumulation parameters of the same category, and solving the range difference of the pollution accumulation parameters of the category;
inputting the range difference into a ROUNDUP function of Excel to obtain the grouping condition of the fouling parameters of the same category;
and calculating probability distribution values of different grouped data by adopting a maximum likelihood estimation algorithm, and obtaining a 50% probability distribution value of the pollution accumulation parameter in the category in unit time.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02226057A (en) * 1989-02-27 1990-09-07 Ngk Insulators Ltd Measurement of amount of dirt in insulator
CN108022011A (en) * 2017-11-30 2018-05-11 国家电网公司 Insulator contamination dynamic prediction method in natural environment
CN109583066A (en) * 2018-11-22 2019-04-05 南京工程学院 A kind of direct current overhead transmission line insulator surface filth deposition analogy method
CN110489867A (en) * 2019-08-20 2019-11-22 国网天津市电力公司电力科学研究院 A kind of contamination accumulation characteristics analysis method of anti-snow slush composite insulator
CN112364520A (en) * 2020-11-19 2021-02-12 国家电网有限公司 Method for predicting accumulated dirt amount of insulator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02226057A (en) * 1989-02-27 1990-09-07 Ngk Insulators Ltd Measurement of amount of dirt in insulator
CN108022011A (en) * 2017-11-30 2018-05-11 国家电网公司 Insulator contamination dynamic prediction method in natural environment
CN109583066A (en) * 2018-11-22 2019-04-05 南京工程学院 A kind of direct current overhead transmission line insulator surface filth deposition analogy method
CN110489867A (en) * 2019-08-20 2019-11-22 国网天津市电力公司电力科学研究院 A kind of contamination accumulation characteristics analysis method of anti-snow slush composite insulator
CN112364520A (en) * 2020-11-19 2021-02-12 国家电网有限公司 Method for predicting accumulated dirt amount of insulator

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