CN102735582A - Method for measuring contamination degree of surface of electric power insulator - Google Patents

Abstract

The invention discloses a method for measuring the pollution degree of the surface of an electric insulator, which uses a clean sampling cloth to wipe the dirt on the surface of the insulator, weighs the mass difference m1 of the clean sampling cloth before sampling and after sampling, and dips the dirty sampling cloth after sampling to remove Dissolve soluble contamination in deionized water, measure the conductivity of the deionized aqueous solution containing contamination, convert the mass of soluble contamination into m2 and convert it into salt density, and the mass of insoluble contamination is m1-m2, and convert it into gray density to obtain the surface contamination of power insulators Spend. Compared with the prior art, the present invention breaks the measurement sequence of the traditional measurement method, uses drying and weighing instead of filtering and drying in the traditional method, effectively reduces the sampling measurement error, shortens the sampling measurement cycle, and is easier to master and popularize.

Description

A method for measuring the surface pollution degree of power insulators

technical field

The invention relates to a technology for measuring the degree of pollution of external electric power insulation, in particular to a method for measuring the degree of pollution on the surface of a power insulator.

Background technique

Insulators are the most commonly used insulating fixtures on power overhead transmission lines. They are susceptible to industrial pollution or natural salinity, dust and other pollution when exposed to the air for a long time. When the pollution on the surface of the insulator reaches a certain level, under humid conditions, the pollution on the surface of the insulator will be dissolved by moisture, forming a conductive channel that shorts the insulator, resulting in a pollution flashover accident. In recent years, with the deteriorating atmospheric environment and increasing pollution, pollution flashover accidents in power systems have occurred frequently. According to statistics, pollution flashover accidents have taken the second place in the total number of accidents in the power grid, second only to lightning accidents, but their losses are 10 times that of lightning accidents. Therefore, preventing pollution flashover accidents has become one of the main tasks to ensure the safe operation of power systems.

At present, the implementation plan or implementation period of common pollution flashover prevention measures needs to be determined according to the pollution degree of the insulator surface. Therefore, accurate and rapid measurement of the pollution degree of the insulator surface has become one of the primary tasks to ensure the safe operation of the power system. The traditional sampling measurement method is to clean the dirt on the surface of the insulator with deionized water, measure the conductivity of the dirty solution to calculate the salt density; then use filter paper to filter the dirty solution, and weigh the difference between the quality of the filter paper before and after filtration to calculate the gray density. However, in the test operation, using deionized water to clean the dirty surface of the insulator will easily cause the dirty solution to splash and cause measurement errors; to use filter paper to filter the dirty solution, it is inconvenient to filter the dirty solution in multiple times, and the filtration cycle is long, which is easy to settle due to air pollution cause error.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a method for measuring the surface pollution of electric insulators, which can effectively reduce the sampling measurement error and shorten the sampling measurement period.

The present invention is realized through the following technical solutions: a method for measuring the degree of contamination on the surface of an electric insulator, which is characterized in that a clean sampling cloth is used to wipe the contamination on the surface of the insulator, and the mass difference m1 between before and after sampling of the clean sampling cloth is weighed, and the sample is taken Finally, soak the contaminated sampling cloth in deionized water to dissolve the soluble contamination, measure the conductivity of the deionized aqueous solution containing the contamination, convert the mass of soluble contamination into m2 and convert it into salt density, and the mass of insoluble contamination is m1-m2, and convert it into Gray density, to obtain the degree of pollution on the surface of the power insulator.

The specific steps of the above method for sampling and measuring the surface pollution of power insulators are as follows:

(1) Put the clean sampling cloth into the corresponding paper cup, and then put the paper cup into a 60°C constant temperature drying box to dry for 2 hours; after drying, use an electronic balance to weigh the mass m1 of the paper cup and clean sampling cloth and record it;

(2) Spray 1ml-2ml deionized water on the surface of the insulator to be sampled to ensure that no droplets will fall on the surface of the insulator;

(3) Use a clean sampling cloth to clean and sample the above-mentioned insulators sprayed with deionized water to obtain a dirty sampling cloth;

(4) Put the above-mentioned contaminated sampling cloth into the corresponding paper cup, and then put the paper cup into a 60°C constant temperature drying box to dry for 4 hours; after drying, use an electronic balance (measurement accuracy 0.0001g) to weigh the paper cup and The mass m2 of the sampling cloth containing contamination shall be recorded;

(5) Calculate the mass m3 of soluble pollution and insoluble pollution degree, m3=m2-m1;

(6) Dip the contaminated sampling cloth into deionized water and stir it fully with a glass rod to fully dissolve the soluble contamination on the sampling cloth in deionized water; measure the conductivity of the deionized aqueous solution containing contamination and replace it with the mass of soluble contamination m4 , and divide the mass by the surface area of the insulator to convert the salt density; (7) Calculate the mass m5 of the insoluble pollution degree, m5=m3-m4, and divide the mass by the surface area of the insulator to convert the ash density.

Compared with the prior art, the present invention breaks the measurement sequence of the traditional measurement method, uses drying and weighing instead of filtering and drying in the traditional method, effectively reduces the sampling measurement error, shortens the sampling measurement cycle, and is easier to master and popularize.

Detailed ways

The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto, and the process parameters not specifically indicated can be carried out with reference to conventional techniques.

Example

The method for measuring the surface pollution degree of electric insulators of the present invention uses a clean sampling cloth to clean and wipe the dirt on the surface of the insulator, weighs the quality difference m1 of the clean sampling cloth before sampling and after sampling, and immerses the dirty sampling cloth in deionized water after sampling to make the soluble Dissolution of pollution, measure the conductivity of the deionized aqueous solution containing pollution, convert the mass of soluble pollution in m2 and convert it into salt density, and the mass of insoluble pollution is m1-m2, and convert it into gray density to obtain the surface pollution degree of power insulators.

The above method of sampling and measuring the surface pollution degree of power insulators can be realized through the following steps:

(1) Put the clean sampling cloth into the corresponding paper cup, and then put the paper cup into a 60°C constant temperature drying box to dry for 2 hours; after drying, use an electronic balance to weigh the mass m1 of the paper cup and clean sampling cloth and record it;

(2) Spray 1ml-2ml deionized water on the surface of the insulator to be sampled to ensure that no droplets will fall on the surface of the insulator;

(3) Use a clean sampling cloth to clean and sample the above-mentioned insulators sprayed with deionized water to obtain a dirty sampling cloth;

(4) Put the above-mentioned contaminated sampling cloth into the corresponding paper cup, and then put the paper cup into a 60°C constant temperature drying box to dry for 4 hours; after drying, use an electronic balance (measurement accuracy 0.0001g) to weigh the paper cup and The mass m2 of the sampling cloth containing contamination shall be recorded;

(5) Calculate the mass m3 of soluble pollution and insoluble pollution degree, m3=m2-m1;

(6) Dip the contaminated sampling cloth into deionized water and stir it fully with a glass rod to fully dissolve the soluble contamination on the sampling cloth in deionized water; measure the conductivity of the deionized aqueous solution containing contamination and replace it with the mass of soluble contamination m4 , and divide the mass by the surface area of the insulator to convert the salt density;

Table 1: Insulator surface area and deionized water consumption table

(7) Calculate the mass m5 of the insoluble pollution degree, m5=m3-m4, and divide the mass by the surface area of the insulator to convert the gray density.

Claims (2)

1. electric insulator surface filth degree measuring method; It is characterized in that using clear wiping of cleaning sampling cloth to get the insulator surface filth; Weighing is cleaned before the sampling of sampling cloth and the m1 of poor quality after taking a sample; With making the filthy dissolving of solubility in the sampling cloth immersion deionized water that contains dirt after the sampling, it is close to measure the deionized water solution conductivity conversion solubility filth quality m2 that contains filth and the salify that converts, and the filthy quality of insolubility is m1-m2; And be converted into the ash close, obtain electric insulator surface filth degree.

2. electric insulator surface filth degree sampling and measuring method according to claim 1 is characterized in that measuring process is following:

(1) will clean sampling cloth and put into corresponding dixie cup, again dixie cup put into 60 ℃ of constant temperature drying case oven dry 2 hours; After the oven dry, use the quality m1 and the record of electronic balance weighing dixie cup and cleaning sampling cloth;

(2) at the surface sprinkling 1ml-2ml deionized water of insulator of waiting to take a sample, it is low to guarantee that insulator surface does not have drop;

(3) use cleaning sampling cloth that the above-mentioned insulator that sprayed deionized water is wiped sampling clearly, obtain containing filthy sampling cloth;

(4) the above-mentioned sampling cloth that contains filth is put into corresponding dixie cup, again dixie cup is put into 60 ℃ of constant temperature drying casees oven dry 4 hours; After the oven dry, use electronic balance (measuring accuracy 0.0001g) weighing dixie cup and contain filthy sampling cloth quality m2 and record;

(5) the quality m3 of filth of calculating solubility and insolubility filth degree, m3=m2-m1;

(6) will contain filthy sampling cloth and immerse in the deionized water, fully stir, make that the solubility filth fully is dissolved in the deionized water on the sampling cloth with glass bar; Measurement contains filthy deionized water solution conductivity and changes the filthy quality m4 of solubility into, and close divided by the long-pending conversion salt of insulator surface with this quality;

(7) the quality m5 of calculating insolubility filth degree, m5=m3-m4, and close with this quality divided by the long-pending ash that converts of insulator surface.