CN112364520A - Method for predicting accumulated dirt amount of insulator - Google Patents

Method for predicting accumulated dirt amount of insulator Download PDF

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CN112364520A
CN112364520A CN202011307108.7A CN202011307108A CN112364520A CN 112364520 A CN112364520 A CN 112364520A CN 202011307108 A CN202011307108 A CN 202011307108A CN 112364520 A CN112364520 A CN 112364520A
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insulator
test
dirt
tested
pollution
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CN112364520B (en
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王远东
张志劲
史文江
蒋兴良
张海龙
卢炳宏
张振勇
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Maintenance Branch Of East Inner Mongolia Electric Power Co ltd
Chongqing University
State Grid Corp of China SGCC
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Maintenance Branch Of East Inner Mongolia Electric Power Co ltd
Chongqing University
State Grid Corp of China SGCC
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Abstract

The invention provides a method for predicting the accumulated dirt amount of an insulator, which comprises the following steps: arranging a test insulator in a natural environment where the insulator to be tested is located, and acquiring the pollution accumulation amount of the test insulator and parameters of the test insulator in the pollution accumulation process; the method comprises the steps of obtaining shape parameters of a test insulator and an insulator to be tested, and determining the umbrella skirt area of the insulator according to the shape parameters of the insulator; constructing a pollution accumulation prediction model of the insulator to be detected; the method has the advantages that the dirt accumulation coefficient of the insulator to be detected is determined according to the parameters of the test insulator in the dirt accumulation process, the dirt accumulation amount of the insulator to be detected is obtained by substituting the determined dirt accumulation amount and the test insulator into the dirt accumulation amount prediction model, and by the method, the dirt accumulation amount of the insulator to be detected can be accurately evaluated according to the actual environment where the insulator to be detected is located, so that accurate data support is provided for the dirt accumulation treatment of the insulator, accurate formulation of treatment measures is facilitated, and stable operation of a power system is ensured.

Description

Method for predicting accumulated dirt amount of insulator
Technical Field
The invention relates to a prediction method, in particular to a prediction method of insulator dirt accumulation.
Background
Since the operation of a power system, a pollution flashover accident threatens the safety and stability of a power grid. The insulator is applied to supporting insulation of overhead lines and electrical equipment, and guarantees stable operation of a power system. The insulator is exposed to outdoor environment for a long time, and a large amount of dirty particles are deposited on the surface of the insulator. In rainy or humid weather, the electrical performance of the insulator with a large amount of dirt on the surface can be greatly reduced, so that a flashover accident occurs to the power transmission line, large-area power failure is caused, and the production and life of residents are influenced.
In order to prevent the occurrence of pollution flashover accidents, in the actual line operation, the pollution accumulation state of the line insulator needs to be cleared, and the work of measuring the pollution accumulation state of the insulator is carried out. However, due to the influence of line operation and the limitation of power failure detection, the method is inconvenient for directly measuring the accumulated dirt of the operating insulator, and the existing insulator accumulated dirt amount prediction means is difficult to ensure the accuracy of the prediction of the accumulated dirt amount of the insulator to be measured, so that the method is not favorable for the stable operation of a power system.
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 method for predicting an insulator contamination accumulation amount, which can accurately evaluate the contamination accumulation amount of an insulator to be detected according to an actual environment in which the insulator to be detected is located, so as to provide accurate data support for insulator contamination accumulation treatment, facilitate accurate formulation of treatment measures, and ensure stable operation of a power system.
The invention provides a method for predicting the accumulated dirt amount of an insulator, which comprises the following steps:
s1, arranging a test insulator in a natural environment where the insulator to be tested is located, and acquiring the pollution accumulation amount of the test insulator and parameters of the test insulator in a pollution accumulation process;
s2, obtaining shape parameters of a test insulator and an insulator to be tested;
s3, constructing a prediction model of the pollution accumulation amount of the insulator to be tested:
NSDDb＝α·NSDDXP
wherein, NSDDbNSDD for the amount of accumulated dirt of the insulator to be measuredXPAlpha is the pollution accumulation coefficient of the insulator to be tested;
s4, determining a dirt accumulation coefficient alpha of the insulator to be tested according to parameters of the test insulator in the dirt accumulation process, and substituting the determined alpha and the dirt accumulation of the test insulator into a dirt accumulation prediction model to obtain the dirt accumulation of the insulator to be tested.
Further, parameters of the test insulator in the pollutant accumulation process comprise wind speed, particle size of pollutant particles and types of the pollutant particles.
Further, the fouling coefficient alpha of the insulator to be tested is determined by the following method:
Figure BDA0002788598930000021
wherein, betabIs the volume fraction of contamination, S, of the insulator to be testedbIs the surface area, beta, of the shed of the insulator to be testedXPIs the volume fraction of the contamination of the tested insulator; sXPTo test the shed surface area of the insulator.
Further, the method for determining the pollution volume fraction beta of the insulator to be tested is as followsb：
Figure BDA0002788598930000022
Wherein k isvPredicting the probability, k, of the wind speed v in the time period for the accumulated dirt amount of the insulator to be measureddPredicting the probability that the particle size of the dirt in the time period is d for the accumulated dirt amount of the insulator to be measured, wherein v represents the wind speed, d represents the particle size of the dirt, and betav,dAnd predicting the pollution volume fraction corresponding to the wind speed v and the pollution particle size d in the time period for the pollution amount of the insulator to be measured.
Further, the contaminated volume fraction β of the test insulator was determined by the following methodXP：
Figure BDA0002788598930000031
Wherein k isvFor testing the probability, k, of a wind speed v in an insulator test perioddThe probability that the particle size of the dirt in the test time period of the insulator is d is tested, v represents the wind speed, d represents the particle size of the dirt, and betav,dThe method is a pollution volume fraction corresponding to the wind speed v and the pollution particle size d in the test time period of the insulator.
The invention has the beneficial effects that: according to the invention, the pollution accumulation amount of the insulator to be detected can be accurately evaluated according to the actual environment of the insulator to be detected, so that accurate data support is provided for insulator pollution accumulation treatment, accurate formulation of treatment measures is facilitated, and stable operation of a power system is ensured.
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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.
Detailed Description
The invention is described in further detail below with reference to the drawings of the specification:
the invention provides a method for predicting the accumulated dirt amount of an insulator, which comprises the following steps:
s1, arranging a test insulator in a natural environment where the insulator to be tested is located, and acquiring the pollution accumulation amount of the test insulator and parameters of the test insulator in a pollution accumulation process; wherein the parameters in the pollutant accumulation process comprise wind speed, particle size of pollutant particles and types of the pollutant particles;
s2, acquiring shape parameters of a test insulator and an insulator to be tested, and determining the umbrella skirt area of the insulator according to the shape parameters of the insulator;
s3, constructing a prediction model of the pollution accumulation amount of the insulator to be tested:
NSDDb＝α·NSDDXP
wherein, NSDDbNSDD for the amount of accumulated dirt of the insulator to be measuredXPAlpha is the pollution accumulation coefficient of the insulator to be tested;
s4, determining a pollution accumulation coefficient alpha of the insulator to be detected according to parameters of the test insulator in a pollution accumulation process, substituting the determined alpha and the pollution accumulation of the test insulator into a pollution accumulation prediction model to obtain the pollution accumulation of the insulator to be detected, and by the method, accurately evaluating the pollution accumulation of the insulator to be detected according to the actual environment where the insulator to be detected is located, so that accurate data support is provided for the pollution accumulation treatment of the insulator, accurate formulation of treatment measures is facilitated, and stable operation of a power system is ensured.
In this embodiment, the contamination deposition coefficient α of the insulator to be measured is determined by the following method:
Figure BDA0002788598930000041
wherein, betabIs the volume fraction of contamination, S, of the insulator to be testedbIs the surface area, beta, of the shed of the insulator to be testedXPIs the volume fraction of the contamination of the tested insulator; sXPTo test the shed surface area of the insulator.
Determining the pollution volume fraction beta of the insulator to be tested by the following methodb：
Figure BDA0002788598930000042
Wherein k isvTo be testedProbability, k, of wind speed v in the period of predicting the accumulated dirt amount of the insulatordPredicting the probability that the particle size of the dirt in the time period is d for the accumulated dirt amount of the insulator to be measured, wherein v represents the wind speed, d represents the particle size of the dirt, and betav,dAnd predicting the pollution volume fraction corresponding to the wind speed v and the pollution particle size d in the time period for the pollution amount of the insulator to be measured.
The fouling volume fraction β of the test insulator was determined by the following methodXP：
Figure BDA0002788598930000051
Wherein k isvFor testing the probability, k, of a wind speed v in an insulator test perioddThe probability that the particle size of the dirt in the test time period of the insulator is d is tested, v represents the wind speed, d represents the particle size of the dirt, and betav,dIn the test time period of the insulator test, the wind speed is v, the dirt volume fraction corresponding to the dirt particle diameter d is v, wherein the wind speed is v, and the dirt volume fraction beta corresponding to the dirt particle diameter d is betav,dThe calculation is carried out through a gas-solid two-phase flow model, which is the prior art and is not described herein again: by the method, the pollution accumulation amount of the insulator to be tested can be accurately predicted.
The following is illustrated by a specific example:
in the specific example, XP-160 is adopted as the test insulator, and LXY-160 and XWP are adopted as the test insulators2-160 insulators and composite large-small umbrella insulators are used as insulators to be tested, manual pollution tests are carried out through a test wind tunnel,
selecting industrial SiO with the diameter of 800 meshes2(Quartz powder) is used as the wind tunnel pollution particles of the insulator. Measuring the concentration of the particles in the wind tunnel by using an air particle collector, and controlling the concentration of the particles at 15mg/m3. According to the measuring method of the standard GB/T4585-2004, the contaminated insulator is manually scrubbed, the contaminated liquid is filled into a corresponding container, the degree of contamination on the surface of the insulator is measured and calculated, and the quality of the contaminated material is finally obtained. And in the dirt accumulation process, the concentration of the particulate matters is measured every 0.5h, and the concentration of the particulate matters is kept unchanged. After eight hours of dirt accumulation, divide intoIs respectively paired with XP-160 insulator, LXY-160 insulator and XWP2-160 insulators, and composite mao-mao insulator contamination quality were measured with the following ash density results:
Figure BDA0002788598930000052
according to the test environment parameters and through the numerical model calculation of insulator pollution volume fraction, the LXY-160 insulator, XWP is obtained2-160 insulators, and the theoretical and actual test ash density values and their errors for composite large-small umbrella insulators:
Figure BDA0002788598930000061
as can be seen from the above tests, the error between the result of the prediction method and the actual test result is within the set error range by comparing the result with the actual test result, and the prediction method can be applied to the actual working conditions.
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 (5)

1. A method for predicting the amount of accumulated dirt on an insulator is characterized in that: the method comprises the following steps:
s1, arranging a test insulator in a natural environment where the insulator to be tested is located, and acquiring the pollution accumulation amount of the test insulator and parameters of the test insulator in a pollution accumulation process;
s2, obtaining shape parameters of a test insulator and an insulator to be tested;
s3, constructing a prediction model of the pollution accumulation amount of the insulator to be tested:
NSDDb＝α·NSDDXP
wherein, NSDDbNSDD for the amount of accumulated dirt of the insulator to be measuredXPAlpha is the pollution accumulation coefficient of the insulator to be tested;
s4, determining a dirt accumulation coefficient alpha of the insulator to be tested according to parameters of the test insulator in the dirt accumulation process, and substituting the determined alpha and the dirt accumulation of the test insulator into a dirt accumulation prediction model to obtain the dirt accumulation of the insulator to be tested.
2. The method for predicting the amount of accumulated insulator contamination according to claim 1, wherein: parameters of the test insulator in the pollutant accumulation process comprise wind speed, particle size of pollutant particles and types of the pollutant particles.
3. The method for predicting the amount of accumulated insulator contamination according to claim 1, wherein: determining the fouling coefficient alpha of the insulator to be tested by the following method:
Figure FDA0002788598920000011
wherein, betabIs the volume fraction of contamination, S, of the insulator to be testedbIs the surface area, beta, of the shed of the insulator to be testedXPIs the volume fraction of the contamination of the tested insulator; sXPTo test the shed surface area of the insulator.
4. The method for predicting the amount of accumulated insulator contamination according to claim 3, wherein: determining the pollution volume fraction beta of the insulator to be tested by the following methodb：
Figure FDA0002788598920000021
Wherein k isvPredicting the probability, k, of the wind speed v in the time period for the accumulated dirt amount of the insulator to be measureddPredicting the probability that the particle size of dirt in the time period is d for the accumulated dirt amount of the insulator to be measured, wherein v represents the wind speed, and d represents the dirtParticle size, betav,dAnd predicting the pollution volume fraction corresponding to the wind speed v and the pollution particle size d in the time period for the pollution amount of the insulator to be measured.
5. The method for predicting the amount of accumulated insulator contamination according to claim 3, wherein: the fouling volume fraction β of the test insulator was determined by the following methodXP：
Figure FDA0002788598920000022
Wherein k isvFor testing the probability, k, of a wind speed v in an insulator test perioddThe probability that the particle size of the dirt in the test time period of the insulator is d is tested, v represents the wind speed, d represents the particle size of the dirt, and betav,dThe method is a pollution volume fraction corresponding to the wind speed v and the pollution particle size d in the test time period of the insulator.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113567816A (en) * 2021-07-29 2021-10-29 国家电网有限公司 Insulator contamination measurement method
CN113947040A (en) * 2021-10-12 2022-01-18 中铁第一勘察设计院集团有限公司 Volume distribution coefficient-based method for analyzing uneven dirt accumulation on upper and lower surfaces of insulator

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CN109597961A (en) * 2018-10-19 2019-04-09 国网浙江省电力有限公司电力科学研究院 Differentiate that the different umbellate form insulator contaminations of accuracy compare optimization algorithm based on dirty area
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113567816A (en) * 2021-07-29 2021-10-29 国家电网有限公司 Insulator contamination measurement method
CN113947040A (en) * 2021-10-12 2022-01-18 中铁第一勘察设计院集团有限公司 Volume distribution coefficient-based method for analyzing uneven dirt accumulation on upper and lower surfaces of insulator

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