CN110806531A - Method for evaluating aging state of transformer insulator - Google Patents
Method for evaluating aging state of transformer insulator Download PDFInfo
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- CN110806531A CN110806531A CN201910979989.8A CN201910979989A CN110806531A CN 110806531 A CN110806531 A CN 110806531A CN 201910979989 A CN201910979989 A CN 201910979989A CN 110806531 A CN110806531 A CN 110806531A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/20—Preparation of articles or specimens to facilitate testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a 500kV single-phase transformer insulating part aging state evaluation method based on determination of polymerization degree of insulating paper, which can effectively evaluate the aging state of a 500kV single-phase transformer insulating part. The method provided by the invention comprises four steps: firstly, selecting insulation paper to be subjected to a polymerization degree test in a transformer body, wherein the test insulation paper can effectively represent the aging state of a transformer insulation part; sampling and classifying the insulating paper test samples; thirdly, a test process; and fourthly, evaluating and analyzing the test data. The invention provides a set of effective and generalizable process and method for testing the polymerization degree of the insulating paper and judging the aging state of the insulating paper in the industry.
Description
Technical Field
The invention relates to the technical field of electrical equipment detection, in particular to a transformer insulator aging state evaluation method.
Background
The transformer is one of important equipment of a power system, and plays an important role in connecting different voltage grades and controlling system voltage. The transformer comprises a transformer body, an inner coil, a transformer core, a. At present, various methods are developed in the industry for testing the polymerization degree of the insulating paper and judging the aging state of the insulating paper, but no fixed method and a set of effective and generalizable processes and methods are available.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the method for evaluating the aging state of the transformer insulator, which has the advantages of effectively measuring the aging state of the insulator and being convenient to popularize.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for evaluating the aging state of a transformer insulator, which comprises the following steps:
s1, when the insulation paper to be subjected to the polymerization degree test in the transformer is selected, counting temperature rise hot spots of all parts of the transformer under rated current, and selecting the insulation paper with the highest temperature rise of all windings and leads, wherein the insulation paper comprises the highest temperature rise point of a low-voltage winding and a lead, the highest temperature rise point of a medium-voltage winding and a lead, the highest temperature rise point of a high-voltage winding and a lead, and the highest temperature rise point of a voltage regulating winding and a lead;
s2, preprocessing the transformer, peeling off the insulating paper and the auxiliary insulating paper on the surface of a winding or a lead of the transformer for sampling, and equally dividing each insulating paper sample and each auxiliary insulating paper sample into a plurality of parts;
s3, classifying and marking the collected insulating paper samples and the auxiliary insulating paper samples, and sealing and storing the samples;
s4, carrying out a polymerization degree test on the insulating paper sample and the auxiliary insulating paper sample;
s5, processing the data obtained by the polymerization degree test and evaluating and calculating the processed data;
and S6, comparing the processed data with the insulation life loss fitting graph, and evaluating the aging degree of the insulation.
By adopting the technical scheme, the temperature rise hot spots of all parts of the transformer are counted under the rated current, the highest point of the temperature rise of all parts of the transformer is further determined, the higher the temperature is, the lower the polymerization degree of the insulating part is, namely, the aging degree of the insulating part is more serious, the highest point of all parts of the transformer is obtained through the temperature rise of all parts of the transformer, the position of the transformer for pretreatment is determined, and the workload of pretreatment is reduced. The insulation paper and the auxiliary insulation paper on the surface of the transformer winding or the lead are stripped for sampling and are uniformly divided, so that a plurality of test samples of all parts of the transformer are obtained, the need of re-sampling caused by test failure is reduced, and the test can be performed more smoothly; meanwhile, the influence of human factors, environmental factors and the like on the data in the test process can be reduced by averaging the data, the failure data is eliminated through comparison between the test data, the reliability of the data is tested, the final data of the polymerization degree test is more accurate, and the error of the test data is reduced. The collected insulating paper sample and the auxiliary insulating paper sample are classified to be marked and stored in a sealed mode, the possibility that the insulating sample is affected with damp is reduced, the influence of the external environment on the sample is less, and the accuracy of measuring data by the polymerization degree test of the sample is improved. The aging degree of the insulating part is evaluated by comparing the processed polymerization degree test data with the insulating part life loss fitting graph without using too many external measuring devices and without carrying out operations such as tensile strength test, breakdown strength test, moisture content test and the like on the insulating part, and the evaluation method has the advantages of low cost and simple and convenient operation; meanwhile, when the evaluation method is under a certain condition, the flow and the evaluation method are relatively standardized and are suitable for various conditions, so that the evaluation method can be widely popularized and used.
The invention is further configured to: in S5, the data obtained by the polymerization degree test is processed, specifically:
51. a polymerization degree test for rejection failure;
52. eliminating the minimum value of abnormal data in the polymerization degree test data;
53. and respectively taking out an average value of the polymerization degree test data of each part of the rest transformers.
By adopting the technical scheme, the failed polymerization degree test is eliminated, and the minimum value of abnormal data in the polymerization degree test data is eliminated, so that the error of the polymerization degree test is reduced, the finally obtained average value is more reliable, the data of the polymerization degree test is more accurate, and the data can accurately reflect the aging degree of the insulating part of each part of the transformer; meanwhile, the accuracy of the insulation member aging state evaluation method is improved.
The invention is further configured to: in the step S2, each of the insulating paper and the sub-insulating paper is divided into 5 parts.
By adopting the technical scheme, each part of the insulating paper and the auxiliary insulating paper are respectively divided into 5 parts, so that the insulating parts of all parts of the transformer can be divided into 5 parts for polymerization degree test, 5 times of polymerization degree test can be carried out on all parts of the transformer, the need of re-sampling caused by test failure is reduced, and the test can be carried out more smoothly; meanwhile, the influence of human factors, environmental factors and the like on the data in the test process can be reduced by averaging the data, the failure data is eliminated through comparison between the test data, the reliability of the data is tested, the final data of the polymerization degree test is more accurate, and the error of the test data is reduced.
The invention is further configured to: the mass of each sample of the insulating paper and each sample of the auxiliary insulating paper is more than 40 g.
By adopting the technical scheme, the mass of each insulating paper sample and each auxiliary insulating paper sample is greater than 40g, too few samples are not beneficial to further sampling a small sample in a laboratory to carry out a test and are easily influenced by the environment, the influence of the environment on polymerization degree test data is reduced, and the error of the test data is reduced.
The invention is further configured to: the insulating paper comprises cable paper and 57B crepe paper, and the auxiliary insulating paper comprises 1mm paperboard.
By adopting the technical scheme, the cable paper and the 57B crepe paper are selected from the insulating paper, the 1mm paper board is selected from the auxiliary insulating paper, then the insulating parts of all parts of the transformer are measured, the aging condition of all parts of the transformer is judged through the polymerization degree of the insulating parts of all parts of the transformer, and the aging condition of the insulating parts at the specific selected positions is judged, so that the aging state of the transformer is reflected.
In conclusion, the invention has the following beneficial effects:
1. the temperature rise hot spots of all parts of the transformer are counted under the rated current, so that the highest point of the temperature rise of all parts of the transformer is determined, the position of the transformer for pretreatment is determined by the highest point of the temperature rise of all parts of the transformer, and the workload of pretreatment is reduced; the insulating paper and the auxiliary insulating paper on the surface of the winding or the lead of the transformer are stripped for sampling and are uniformly divided, so that a plurality of test samples of all parts of the transformer are obtained, the need of re-sampling caused by test failure is reduced, and the test can be performed more smoothly; meanwhile, the data averaging can reduce the influence of human factors, environmental factors and the like on the data in the test process, the failure data is eliminated through comparison among test data, the reliability of the data is tested, the final data of the polymerization degree test is more accurate, and the error of the test data is further reduced;
2. the collected insulating paper sample and the auxiliary insulating paper sample are classified to be marked and stored in a sealed mode, so that the possibility that the insulating sample is affected with damp is reduced, the influence of the external environment on the sample is reduced, and the accuracy of data measured by the polymerization degree test of the sample is improved; comparing the processed polymerization degree test data with the insulation part life loss fitting graph, and evaluating the aging degree of the insulation part, wherein excessive external measuring equipment is not needed in the process, and operations such as tensile strength test, breakdown strength test, moisture content test and the like are not needed to be performed on the insulation part, so that the evaluation method is low in cost and simple and convenient to operate; meanwhile, the flow and the evaluation method are relatively standardized, so that the evaluation method can be widely popularized and used.
Drawings
FIG. 1 is a flow chart of the present embodiment;
FIG. 2 is a view showing the state of the polymerization degree test sampling in this example;
FIG. 3 is a graph showing data collected in the polymerization degree test of this example;
FIG. 4 is a life loss fit plot for the insulation of this embodiment;
FIG. 5 is a graph of the operating conditions of a comparative insulation life loss fit of the present example.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 2, the present invention is a method for evaluating an aging state of an insulator of a transformer, the method of the present invention comprises the following steps:
s1, when insulation paper to be subjected to a polymerization degree test in the transformer is selected, in order to enable the selected insulation paper to effectively represent the aging state of a transformer insulation part, temperature rise hot spots of all parts of the transformer under rated current are counted, and the insulation paper with the highest temperature rise of all windings and leads is selected, wherein the insulation paper comprises a low-voltage winding and lead temperature rise highest point, a medium-voltage winding and lead temperature rise highest point, a high-voltage winding and lead temperature rise highest point, and a voltage regulating winding and lead temperature rise highest point;
s2, deoiling the transformer body, stripping the insulating paper and the auxiliary insulating paper on the surface of a winding or a lead of the transformer, and sampling, wherein the sampling positions of the insulating paper are a lead on the upper part of a low-voltage coil A, a lead on the upper neutral point of a medium-voltage coil C and a lead of the medium-voltage coil C, more than 200g of cable paper is respectively taken from the lead on the upper part of the low-voltage coil A and the upper neutral point of the medium-voltage coil C, more than 200g of 57B crepe paper is taken from the lead of the medium-voltage coil C, more than 200g of 1mm paper board is taken from the auxiliary insulating paper, the insulating paper and the auxiliary insulating paper at each part of the collected transformer are equally divided into 5 parts, and the mass of each part is more;
s3, classifying and marking the collected insulating paper, placing the insulating paper into a self-sealing bag, and placing the insulating paper into a new self-sealing bag for vacuumizing storage after the self-sealing bag is brought into a laboratory;
s4, carrying out a polymerization degree test on the insulating paper sample according to the GB/T29305-2012 standard;
s5, eliminating the failed polymerization degree test, eliminating the minimum value of abnormal data in the polymerization degree test data, and respectively taking out the average value of the polymerization degree test data of each part of the rest transformer; referring to fig. 3, 2, the specific data is that the minimum value of the polymerization degree test of the upper lead of the low-voltage a coil is 818, and the average value of the polymerization degree test is 905; the minimum value of the polymerization degree of the neutral point lead at the upper part of the medium-voltage C coil is 803, and the average value of the polymerization degree test is 829; the minimum value of the polymerization degree of the lead of the medium-voltage coil C is 833, and the average value of the polymerization degree test is 915; the minimum polymerization degree of the secondary insulating paper was 1053, and the average polymerization degree test was 1069.4.
S6, as shown in fig. 4 to 5, comparing the processed data with the fitting graph of the life loss of the insulating member, where an abscissa and an ordinate of the fitting graph of the life loss of the insulating member are time and polymerization degree, respectively, the fitting graph of the life loss of the insulating member is provided with a black line and a red line, respectively, where the black line represents an initial condition of the insulation polymerization degree 1200 when the transformer leaves the factory, and the red line represents an initial condition of the insulation polymerization degree 1000 when the transformer leaves the factory. The black line is used for evaluation of the sub-insulating paper, and the red line is used for evaluation of the insulating paper. And respectively substituting the average value of the polymerization degrees of the insulating paper into the ordinate of the red line, simultaneously substituting the average value of the polymerization degree test of the auxiliary insulating paper into the ordinate of the black line, and evaluating the life loss conditions of the insulating paper and the auxiliary insulating paper through an insulating part life loss fitting graph so as to determine the aging degree of the insulating part.
Therefore, the invention utilizes the fact that the higher the temperature, the lower the polymerization degree of the insulating part is, the more serious the aging degree of the insulating part is represented, and further, the temperature rise hot spots of all parts of the transformer are measured, so that the insulating part which effectively represents the aging state of the insulating part of the transformer is quickly and effectively selected for sampling, the efficiency of measuring the aging state of the insulating part is improved, and the method is more efficient and quicker; meanwhile, the evaluation method reduces the need of re-sampling caused by test failure, so that the test can be performed more smoothly; meanwhile, the influence of human factors, environmental factors and the like on the data in the test process can be reduced by averaging the data, the failure data is eliminated through comparison between the test data, the reliability of the data is tested, the final data of the polymerization degree test is more accurate, and the error of the test data is reduced.
The method does not need to use excessive external measuring equipment, and does not need to carry out operations such as tensile strength test, breakdown strength test, moisture content test and the like on the insulating piece, and the evaluation method has lower cost and is simpler and more convenient to operate; meanwhile, when the evaluation method is under a certain condition, the flow and the evaluation method are relatively standardized and are suitable for various conditions, so that the evaluation method can be widely popularized and used.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (5)
1. The invention provides a method for evaluating the aging state of a transformer insulator, which is characterized by comprising the following steps of:
s1, when the insulation paper to be subjected to the polymerization degree test in the transformer is selected, counting temperature rise hot spots of all parts of the transformer under rated current, and selecting the insulation paper with the highest temperature rise of all windings and leads, wherein the insulation paper comprises the highest temperature rise point of a low-voltage winding and a lead, the highest temperature rise point of a medium-voltage winding and a lead, the highest temperature rise point of a high-voltage winding and a lead, and the highest temperature rise point of a voltage regulating winding and a lead;
s2, preprocessing the transformer, peeling off the insulating paper and the auxiliary insulating paper on the surface of a winding or a lead of the transformer for sampling, and equally dividing each insulating paper sample and each auxiliary insulating paper sample into a plurality of parts;
s3, classifying and marking the collected insulating paper samples and the auxiliary insulating paper samples, and sealing and storing the samples;
s4, carrying out a polymerization degree test on the insulating paper sample and the auxiliary insulating paper sample;
s5, processing the data obtained by the polymerization degree test and evaluating and calculating the processed data;
and S6, comparing the processed data with the insulation life loss fitting graph, and evaluating the aging degree of the insulation.
2. The method for evaluating the aging state of the transformer insulator according to claim 1, wherein in S5, data obtained by the polymerization degree test are processed, specifically:
51. a polymerization degree test for rejection failure;
52. eliminating the minimum value of abnormal data in the polymerization degree test data;
53. and respectively taking out an average value of the polymerization degree test data of each part of the rest transformers.
3. The method according to claim 1, wherein in S2, the insulation paper and the sub-insulation paper are divided into 5 parts.
4. The method of evaluating an aging state of an insulator of a transformer according to claim 3, wherein each of the samples of the insulating paper and each of the samples of the sub-insulating paper has a mass of more than 40 g.
5. The method of claim 1, wherein the insulation paper comprises cable paper and 57B crepe paper, and the secondary insulation paper comprises 1mm cardboard.
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Cited By (5)
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| CN111474448A (en) * | 2020-02-24 | 2020-07-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for determining withstand voltage value of factory test after maintenance of converter transformer |
| JP7157268B1 (en) | 2022-03-23 | 2022-10-19 | 一般財団法人電力中央研究所 | Life evaluation method for pole-mounted transformers |
| CN116430182A (en) * | 2023-04-20 | 2023-07-14 | 广东电网有限责任公司佛山供电局 | Evaluation method for insulation ageing resistance of dry-type distribution transformer winding |
| CN117554762A (en) * | 2023-11-17 | 2024-02-13 | 国网宁夏电力有限公司电力科学研究院 | Transformer insulation part aging model building method, medium and system |
| CN117761442A (en) * | 2024-02-19 | 2024-03-26 | 深圳市鼎泰佳创科技有限公司 | Electronic load aging a degree test method System and method for controlling a system test equipment |
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| JP7157268B1 (en) | 2022-03-23 | 2022-10-19 | 一般財団法人電力中央研究所 | Life evaluation method for pole-mounted transformers |
| JP2023140455A (en) * | 2022-03-23 | 2023-10-05 | 一般財団法人電力中央研究所 | Life evaluation method of pole transformer |
| CN116430182A (en) * | 2023-04-20 | 2023-07-14 | 广东电网有限责任公司佛山供电局 | Evaluation method for insulation ageing resistance of dry-type distribution transformer winding |
| CN116430182B (en) * | 2023-04-20 | 2023-12-05 | 广东电网有限责任公司佛山供电局 | Evaluation method for insulation ageing resistance of dry-type distribution transformer winding |
| CN117554762A (en) * | 2023-11-17 | 2024-02-13 | 国网宁夏电力有限公司电力科学研究院 | Transformer insulation part aging model building method, medium and system |
| CN117554762B (en) * | 2023-11-17 | 2024-04-26 | 国网宁夏电力有限公司电力科学研究院 | Transformer insulation part aging model building method, medium and system |
| CN117761442A (en) * | 2024-02-19 | 2024-03-26 | 深圳市鼎泰佳创科技有限公司 | Electronic load aging a degree test method System and method for controlling a system test equipment |
| CN117761442B (en) * | 2024-02-19 | 2024-05-03 | 深圳市鼎泰佳创科技有限公司 | Electronic load aging degree testing method, system and testing equipment |
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