CN116678811B - Method for evaluating thermal aging resistance of dry-type insulating material based on activation energy - Google Patents
Method for evaluating thermal aging resistance of dry-type insulating material based on activation energy Download PDFInfo
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- 239000011810 insulating material Substances 0.000 title claims abstract description 18
- 230000004913 activation Effects 0.000 title claims abstract description 17
- 238000003878 thermal aging Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 17
- 230000032683 aging Effects 0.000 claims abstract description 73
- 238000011156 evaluation Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 41
- 230000008569 process Effects 0.000 claims description 8
- 102000016550 Complement Factor H Human genes 0.000 claims description 3
- 108010053085 Complement Factor H Proteins 0.000 claims description 3
- 238000013501 data transformation Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 239000000306 component Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract
The invention discloses an evaluation method of thermal ageing resistance of a dry-type insulating material based on activation energy. The invention can effectively judge the thermal aging resistance of the insulating material for the dry-type transformer by using the evaluation method, provides a reference basis for the selection and evaluation of the insulating material for the dry-type transformer, and improves the safety and economy of the dry-type transformer.
Description
Technical Field
The invention belongs to the field of electric insulation on-line monitoring and fault diagnosis, and particularly relates to an evaluation method of thermal aging resistance of a dry-type insulation material based on activation energy.
Technical Field
The transformer is a core component device of the power system, and has important roles for power generation, transmission and distribution. Dry-type transformers have taken a significant role in practical use due to their own advantages, and have a large market share. Therefore, the reliable and stable operation of the dry-type transformer is ensured, and the method has very important significance for the normal operation of a power grid and the satisfaction of the power consumption requirement of a user. However, with the continuous improvement of the electric power level in China and the continuous complicacy and severity of the operation condition of the dry-type transformer, higher requirements are also put forward for the dry-type transformer. Particularly in some damp and stuffy areas, the heat dissipation of the dry-type transformer is difficult in the environment, and the insulation material is easy to thermally age to cause the damage of an insulation structure, even the insulation breakdown of the dry-type transformer is caused, and the stable operation of a power grid is damaged, so that the thermal aging resistance of the insulation material of the dry-type transformer needs to be evaluated. Therefore, there is an urgent need for a method for evaluating the thermal aging resistance of an insulating material for a dry type transformer. The activation energy represents the energy resistance which needs to be overcome when the material reacts, and directly and accurately reflects the aging degree of the insulating material. Therefore, the evaluation method based on the activation energy has important reference value for judging the state of the insulating material, and also provides guidance for the selection and application of the insulating material of the dry-type transformer.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide an evaluation method for the thermal ageing resistance of a dry-type transformer insulating material based on activation energy, which can well evaluate the thermal ageing resistance of the insulating material for a dry-type transformer and select a proper insulating material.
The technical scheme for realizing the invention is as follows:
the first step: preparation of test Material samples heat aged
Acquiring the average temperature of an insulating material per se in the operation process of the dry-type transformer according to the operation record of the dry-type transformer, wherein the average temperature is marked as T and the unit is K; preparing a plurality of test material samples with the same specification and size, dividing the test material samples into seven groups, respectively placing each group of three test samples into an aging box, setting the aging temperature to be T+20K, wherein the seven groups of samples correspond to seven aging times, the aging times are respectively 0h (non-aging), 48h,96h,240h,312h,360h and 408h, taking out after aging, and carrying out the next operation after the test material samples are completely cooled;
and a second step of: obtaining heat aging quality loss factor of material
The test specimens which were completely cooled after aging were weighed, and the weight of each specimen was recorded as M n,m The unit is g, wherein n=1, 2,3 (7) the number of the components, representing the age group to which the sample belongs; m=1, 2,3, representing the number of samples belonging to each aging group; obtaining a heat aging quality loss factor R of the sample by the formula (1) z ；
And a third step of: acquisition of Heat aging activation energy loss factor of Material
Dielectric response tests are respectively carried out on the samples which are completely cooled after aging, and in order to ensure the accuracy of the tests, the tests are carried out in a temperature control box, and the temperature control error of the temperature control box is allowed to be within a range of 1K; placing a sample to be tested, controlling the temperature in a box to be 300K, and obtaining the dielectric loss tangent tan delta of the sample within the frequency range of 0.0001-1000 Hz to obtain a curve of the frequency and the dielectric loss tangent at the moment; then, the control frequency is kept unchanged at 50Hz, the temperature in the box is changed, and dielectric loss tangent values at 300K,310K,320K,330K and 340K are recorded; according to the obtained dielectric loss tangent values at five different temperatures, corresponding to the previous frequency-dielectric loss tangent value curve, obtaining corresponding frequencies, and obtaining five groups of frequency temperature data; five groups of temperature reciprocal and corresponding frequency logarithmic data can be obtained by utilizing data transformation, coordinate dotting is carried out by utilizing the five groups of data, the temperature reciprocal is an abscissa, and the frequency logarithmic is an ordinate; simultaneously, carrying out linear fitting by a least square method, recording the slope of a fitting straight line and the intercept with a longitudinal axis, wherein the two values are dimensionless, repeating the operation of each test sample to obtain the slope of the straight line, namely K n,m Intercept of J n,m Wherein n=1, 2,3 (7) the number of the components, representing the age group to which the sample belongs; m=1, 2,3, representing that the sample belongs to each aging groupSamples of which number; obtaining the heat aging activation energy loss factor H of the sample by the formula (2) z ；
Wherein k is Boltzmann constant, and e is an electronic standard charge quantity;
fourth step: determining an evaluation coefficient of thermal ageing resistance of a material
Determining the thermal ageing resistance evaluation coefficient P of the material by the formula (3) z ；
Fifth step: evaluation of Heat aging resistance of materials
Evaluating the heat aging resistance of the material, if P is more than or equal to 0 z The heat aging resistance of the material is good if the heat aging resistance is less than or equal to 1; if 1 is less than P z And less than or equal to 5, the heat aging resistance of the material is general; if 5 is less than P z It is indicated that the material has poor thermal aging resistance.
The method has the beneficial effects that the heat aging resistance performance evaluation method based on the activation energy can accurately judge the heat aging resistance performance of the material by preparing the heat aging treated test material sample based on the intrinsic property activation energy of the material and considering the mass loss, so that the basis is provided for evaluating and selecting the insulating material of the dry-type transformer, and the operation safety, economy and reliability of the dry-type transformer are improved.
Drawings
FIG. 1 shows a flow chart of an evaluation method of thermal aging resistance of a dry-change insulating material based on activation energy.
Detailed Description
The invention will be further described with reference to the drawings and detailed description. It should be emphasized that the specific embodiments described herein are merely illustrative of the present invention and are not limiting on the scope of the inventive concept and the claims.
The first step: preparation of test Material samples heat aged
Acquiring the average temperature of the insulating material per se in the operation process of the dry-type transformer according to the operation record of the dry-type transformer, and recording the average temperature as T with the value of 400K; preparing a plurality of test material samples with the same specification and size, dividing the test material samples into seven groups, respectively placing each group of three test samples into an aging box, setting the aging temperature to be 420K, wherein the seven groups of samples correspond to seven aging times, the aging times are respectively 0h (non-aging), 48h,96h,240h,312h,360h and 408h, taking out after aging, and carrying out the next operation after the test material samples are completely cooled;
and a second step of: obtaining heat aging quality loss factor of material
The test specimens which were completely cooled after aging were weighed, and the weight of each specimen was recorded as M n,m The unit is g, wherein n=1, 2,3 (7) the number of the components, representing the age group to which the sample belongs; m=1, 2,3, representing the number of samples belonging to each aging group; here, each aging group is exemplified by taking one sample, and the weights are respectively: 9.2g,9.1913g,9.1902g,9.1898g,9.1889g,9.1878g,9.1865g, the heat aging mass loss factor R of the sample was obtained by the formula (1) z ；
And a third step of: acquisition of Heat aging activation energy loss factor of Material
Dielectric response tests are respectively carried out on the samples which are completely cooled after aging, and in order to ensure the accuracy of the tests, the tests are carried out in a temperature control box, and the temperature control error of the temperature control box is allowed to be within a range of 1K; placing a sample to be tested, controlling the temperature in a box to be 300K, and obtaining the dielectric loss tangent tan delta of the sample within the frequency range of 0.0001-1000 Hz to obtain a curve of the frequency and the dielectric loss tangent at the moment; then the control frequency is kept unchanged at 50Hz, the temperature in the box is changed, and the dielectric loss angles at 300K,310K,320K,330K and 340K are recordedCutting value; according to the obtained dielectric loss tangent values at five different temperatures, corresponding to the previous frequency-dielectric loss tangent value curve, obtaining corresponding frequencies, and obtaining five groups of frequency temperature data; five groups of temperature reciprocal and corresponding frequency logarithmic data can be obtained by utilizing data transformation, coordinate dotting is carried out by utilizing the five groups of data, the temperature reciprocal is an abscissa, and the frequency logarithmic is an ordinate; simultaneously, carrying out linear fitting by a least square method, recording the slope of a fitting straight line and the intercept with a longitudinal axis, wherein the two values are dimensionless, repeating the operation of each test sample to obtain the slope of the straight line, namely K n,m Intercept of J n,m Wherein n=1, 2,3 (7) the number of the components, representing the age group to which the sample belongs; m=1, 2,3, representing the number of samples belonging to each aging group; taking the unaged group as an example here, the calculation results are: slope 5390.597 and intercept-17.039; obtaining the heat aging activation energy loss factor H of the sample by the formula (2) z ；
Wherein k is Boltzmann constant, and e is an electronic standard charge quantity;
fourth step: determining an evaluation coefficient of thermal ageing resistance of a material
Determining the thermal ageing resistance evaluation coefficient P of the material by the formula (3) z ；
Fifth step: evaluation of Heat aging resistance of materials
The thermal ageing resistance evaluation coefficient of the material is calculated to be 0.549, and the thermal ageing resistance of the material is good.
Claims (1)
1. The method for evaluating the thermal ageing resistance of the dry-type insulating material based on the activation energy is characterized by comprising the following steps of:
the first step: preparing a test material sample subjected to heat aging treatment;
and a second step of: acquiring a heat aging quality loss factor of the material;
and a third step of: acquiring a heat aging activation energy loss factor of the material;
fourth step: determining an evaluation coefficient of thermal ageing resistance of the material;
fifth step: evaluating the thermal ageing resistance of the material;
the specific process of the first step is as follows:
acquiring the average temperature of an insulating material per se in the operation process of the dry-type transformer according to the operation record of the dry-type transformer, wherein the average temperature is marked as T and the unit is K; preparing a plurality of test material samples with the same specification and size, dividing the test material samples into seven groups, respectively placing each group of three test samples into an aging box, setting the aging temperature to be T+20K, wherein the seven groups of samples correspond to seven aging times, the aging times are respectively 0h (non-aging), 48h,96h,240h,312h,360h and 408h, taking out after aging, and carrying out the next operation after the test material samples are completely cooled;
the specific process of the second step is as follows:
the test specimens which were completely cooled after aging were weighed, and the weight of each specimen was recorded as M n,m In g, where n=1, 2,3 … 7, represents the aging time group to which the sample belongs; m=1, 2,3, representing the number of samples belonging to each aging group; obtaining a heat aging quality loss factor R of the sample by the formula (1) z ；
The specific process of the third step is as follows:
dielectric response tests are respectively carried out on the samples which are completely cooled after aging, and in order to ensure the accuracy of the tests, the tests are carried out in a temperature control box, and the temperature control error of the temperature control box is allowed to be within a range of 1K; placing a sample to be tested, controlling the temperature in the box to be 300K, and obtaining the sample with the frequency of 0.0001-1000HA dielectric loss tangent tan delta in the z range, and obtaining a curve of the frequency and the dielectric loss tangent at the moment; then, the control frequency is kept unchanged at 50Hz, the temperature in the box is changed, and dielectric loss tangent values at 300K,310K,320K,330K and 340K are recorded; according to the obtained dielectric loss tangent values at five different temperatures, corresponding to the previous frequency-dielectric loss tangent value curve, obtaining corresponding frequencies, and obtaining five groups of frequency temperature data; five groups of temperature reciprocal and corresponding frequency logarithmic data can be obtained by utilizing data transformation, coordinate dotting is carried out by utilizing the five groups of data, the temperature reciprocal is an abscissa, and the frequency logarithmic is an ordinate; simultaneously, carrying out linear fitting by a least square method, recording the slope of a fitting straight line and the intercept with a longitudinal axis, wherein the two values are dimensionless, repeating the operation of each test sample to obtain the slope of the straight line, namely K n,m Intercept of J n,m Where n=1, 2,3 … 7, represents the aging time group to which the sample belongs; m=1, 2,3, representing the number of samples belonging to each aging group; obtaining the heat aging activation energy loss factor H of the sample by the formula (2) z ；
Wherein k is Boltzmann constant, and e is an electronic standard charge quantity;
the specific process of the fourth step is as follows:
determining the thermal ageing resistance evaluation coefficient P of the material by the formula (3) z ；
The specific process of the fifth step is as follows:
evaluating the heat aging resistance of the material, if P is more than or equal to 0 z The heat aging resistance of the material is good if the heat aging resistance is less than or equal to 1; if 1 is less than P z And less than or equal to 5, the heat aging resistance of the material is general; if 5 < ">P z It is indicated that the material has poor thermal aging resistance.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110879290A (en) * | 2019-12-09 | 2020-03-13 | 国网天津市电力公司 | Method for acquiring activation energy of dry-type insulation equipment based on static method |
| CN111999610A (en) * | 2020-08-11 | 2020-11-27 | 国网天津市电力公司电力科学研究院 | Dry-type insulation equipment aging evaluation and service life prediction method based on activation energy |
| CN114167221A (en) * | 2021-12-13 | 2022-03-11 | 华北电力大学（保定） | Epoxy resin insulation aging discrimination and inspection method under different voltage frequencies |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110879290A (en) * | 2019-12-09 | 2020-03-13 | 国网天津市电力公司 | Method for acquiring activation energy of dry-type insulation equipment based on static method |
| CN111999610A (en) * | 2020-08-11 | 2020-11-27 | 国网天津市电力公司电力科学研究院 | Dry-type insulation equipment aging evaluation and service life prediction method based on activation energy |
| CN114167221A (en) * | 2021-12-13 | 2022-03-11 | 华北电力大学（保定） | Epoxy resin insulation aging discrimination and inspection method under different voltage frequencies |
Non-Patent Citations (1)
| Title |
|---|
| 环氧树脂类干式变压器绝缘老化状态评估方法研究;任万利;中国优秀硕士学位论文全文数据库;第1-59页 * |
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