CN111159868B - Oil immersed transformer vibration analysis method considering insulating oil vibration inhibition effect - Google Patents
Oil immersed transformer vibration analysis method considering insulating oil vibration inhibition effect Download PDFInfo
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- CN111159868B CN111159868B CN201911323664.0A CN201911323664A CN111159868B CN 111159868 B CN111159868 B CN 111159868B CN 201911323664 A CN201911323664 A CN 201911323664A CN 111159868 B CN111159868 B CN 111159868B
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- 238000004458 analytical method Methods 0.000 title claims abstract description 19
- 230000005764 inhibitory process Effects 0.000 title claims description 6
- 230000000694 effects Effects 0.000 title description 5
- 230000001629 suppression Effects 0.000 claims abstract description 26
- 238000009413 insulation Methods 0.000 claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims description 14
- 239000002689 soil Substances 0.000 claims description 8
- 230000005494 condensation Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention relates to an oil immersed transformer vibration analysis method considering insulation oil vibration suppression effect, insulation oil fluid vibration is obtained by coupling a fluid field of insulation oil vibration and a structural field of transformer body vibration, a propagation equation is established, a time and displacement relation diagram is obtained through testing under the condition that insulation oil vibration suppression is not considered and insulation oil vibration suppression is considered, so that correction ratio coefficients are introduced, and a numerical diagram of the correction ratio coefficients under different temperatures is established for rapid modification of vibration analysis. The vibration analysis after the influence of the insulating oil is considered is more practical than the original vacuum model used for calculating the vibration of the oil immersed transformer, and meanwhile, the quick correction of the influence factors of the insulating oil is realized.
Description
Technical Field
The invention relates to a detection technology, in particular to a vibration analysis method of an oil immersed transformer considering the vibration suppression effect of insulating oil.
Background
At present, an oil-immersed transformer plays an increasingly important role in transmission and distribution networks in China, but the transformer inevitably vibrates in operation, faults or metal fatigue occur in the transformer due to long-time vibration, the service life and the internal operation condition of the transformer can be effectively evaluated by accurately analyzing and calculating vibration of the oil-immersed transformer, and therefore accurate calculation is very important.
Disclosure of Invention
Aiming at the problem that the vibration calculation of the conventional oil immersed transformer is inaccurate due to the fact that the existence of insulating oil is ignored, the invention provides the transformer vibration analysis method considering the vibration suppression effect of the insulating oil, and compared with the original calculation, the transformer vibration analysis method is more accurate and more practical.
The technical scheme of the invention is as follows: the vibration analysis method of the oil immersed transformer considers the vibration inhibition effect of insulating oil, wherein the vibration of the oil immersed transformer comprises the vibration inhibition of transformer working vibration plus insulating oil fluid vibration to the transformer; the specific steps of analysis are as follows:
1) The vibration suppression of the insulating oil fluid vibration to the transformer is obtained by coupling a fluid field of the insulating oil vibration and a structural field of the transformer body vibration, and the propagation equation is as follows:
wherein: p is the fluctuating pressure; c 0 The propagation speed of vibration waves in the insulating oil is m/s; t is a time variable;is a laplace operator;
2) Introducing a correction ratio coefficient beta taking into account insulation oil inhibition to modify vibration analysis:
S soil ＝(1-β)S
s represents a vibration displacement calculation value without considering insulation oil vibration suppression; s is S soil Representing a vibration displacement calculation value considering insulation oil vibration suppression;
setting a test temperature, establishing a transformer working vibration displacement curve graph under the conditions of time establishment and no consideration of insulation oil vibration suppression and insulation oil vibration suppression at the temperature, and obtaining a correction ratio coefficient beta under the test temperature by the two curve graphs;
3) Directly influencing the fluctuation pressure p in the fluid according to the dynamic viscosity and density of the insulating oil at different temperatures, and obtaining a correction ratio coefficient beta at different temperatures according to the formula of the step 2);
wherein v is the dynamic viscosity of the insulating oil,s l is the condensation coefficient of insulating oil; ρ is the insulating oil density;
4) And establishing a numerical graph corresponding to the correction ratio coefficient beta and the temperature, and rapidly correcting the vibration of the oil-immersed transformer at different temperatures.
The invention has the beneficial effects that: according to the oil-immersed transformer vibration analysis method considering the vibration suppression effect of the insulating oil, vibration analysis after the influence of the insulating oil is considered is more practical than the original vacuum model used for calculating the vibration of the oil-immersed transformer, and meanwhile, the influence factors of the insulating oil are quickly corrected.
Drawings
FIG. 1 is a schematic diagram of the insulating oil influencing factors of the present invention;
FIG. 2 is a graph showing the comparison of the vibration suppression effect of insulating oil at the same temperature according to the present invention;
fig. 3 is a graph of the temperature function of the correction factor β according to the present invention.
Detailed Description
The vibration of the oil immersed transformer causes the insulating oil on the contact surface to deform, the surface force acting to generate energy is shown in the form of pressure resultant force, and the insulating oil is transmitted to the oil tank wall from near to far in the form of pressure wave, as shown in fig. 1. The insulating oil externally shows fluid vibration, the surface force generated at the position, namely the pressure, is the key of coupling the fluid field of the insulating oil vibration and the structural field of the transformer body vibration, and the propagation equation is as follows:
wherein: p is the fluctuating pressure; c 0 The propagation speed of vibration waves in the insulating oil is m/s; t is a time variable;is a laplace operator.
The insulating oil will have a suppressing effect on the vibration of the transformer due to the pressure wave generated by the vibration of the insulating oil, which becomes such that the amplitude of the vibration of the transformer is reduced to some extent. The fluid field calculation is introduced on the basis of the conventional vibration calculation, and a comparison diagram of the suppression of the insulating oil to the vibration of the transformer at the same temperature is shown in fig. 2.
The correction calculation of the vibration influence by the damping effect of the insulating oil is realized by introducing a vibration suppression percentage coefficient beta.
S soil ＝(1-β)S (2)
Wherein: s represents a conventional vibration displacement calculation value (known) irrespective of the vibration suppression of the insulating oil, m; s is S soil A vibration displacement calculation value (obtainable by the formula (1) suppressing action) in consideration of the suppression of the vibration of the insulating oil, m; beta (%) represents a correction ratio coefficient considering insulation oil suppression. The percentage coefficient of vibration suppression β for one temperature can be obtained by fig. 2.
It is noted from the formula (3) that the wave pressure P in the fluid is closely related to the physical parameters such as the dynamic viscosity and density of the insulating oil. The temperature has remarkable influence on physical parameters such as dynamic viscosity and density of the insulating oil, so the correction coefficient beta is a function of the temperature, the beta change is remarkable at different temperatures, a temperature function model of insulating vibration is established, and the correction coefficient beta at different temperatures is calculated, as shown in fig. 3.
Wherein: v is the dynamic viscosity of the insulating oil,s l is the condensation coefficient of insulating oil; ρ is the insulating oil density.
The force considering the influence of the insulating oil can be obtained by the following formula:
F soil ＝F ori -P·S T
F soil denoted as force taking into account the influence of insulating oil, F ori Denoted as applied force irrespective of influence of insulating oil, S T Expressed as transformer area. From both forces can be calculatedThe displacement in both cases is shown, as well as the two curves shown in figure 2.
And (3) obtaining fluctuation pressures at different temperatures according to a formula (3), obtaining correction ratio coefficients beta under different temperatures, wherein the correction ratio coefficients beta are considered for inhibiting the insulating oil, and establishing a numerical diagram corresponding to the temperature and shown in the figure 3, so that the quick correction of the vibration of the oil immersed transformer at different temperatures is realized.
The invention relates to a transformer vibration analysis method considering the vibration suppression effect of insulating oil. On the basis of conventional vibration calculation, a fluid field is introduced to introduce the influence factor of insulating oil into the vibration analysis of the transformer, so that a calculation model is more practical, and the vibration analysis of the transformer can be corrected. Meanwhile, a correction coefficient beta based on a temperature function is introduced, so that the vibration of insulating oil with different temperatures can be quickly corrected.
Claims (1)
1. The oil immersed transformer vibration analysis method considering the insulation oil vibration suppression effect is characterized in that the oil immersed transformer vibration comprises the vibration suppression of transformer working vibration plus insulation oil fluid vibration to the transformer; the specific steps of analysis are as follows:
1) The vibration suppression of the insulating oil fluid vibration to the transformer is obtained by coupling a fluid field of the insulating oil vibration and a structural field of the transformer body vibration, and the propagation equation is as follows:
wherein: p is the fluctuating pressure; c 0 The propagation speed of vibration waves in the insulating oil is m/s; t is a time variable;is a laplace operator;
2) Introducing a correction ratio coefficient beta taking into account insulation oil inhibition to modify vibration analysis:
S soil ＝(1-β)S
s represents a vibration displacement calculation value without considering insulation oil vibration suppression; s is S soil Representing a vibration displacement calculation value considering insulation oil vibration suppression;
setting a test temperature, establishing a transformer working vibration displacement curve graph under the conditions of time establishment and no consideration of insulation oil vibration suppression and insulation oil vibration suppression at the temperature, and obtaining a correction ratio coefficient beta under the test temperature by the two curve graphs;
3) Directly influencing the fluctuation pressure p in the fluid according to the dynamic viscosity and density of the insulating oil at different temperatures, and obtaining a correction ratio coefficient beta at different temperatures according to the formula of the step 2);
wherein v is the dynamic viscosity of the insulating oil,s l is the condensation coefficient of insulating oil; ρ is the insulating oil density;
4) And establishing a numerical graph corresponding to the correction ratio coefficient beta and the temperature, and rapidly correcting the vibration of the oil-immersed transformer at different temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911323664.0A CN111159868B (en) | 2019-12-20 | 2019-12-20 | Oil immersed transformer vibration analysis method considering insulating oil vibration inhibition effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911323664.0A CN111159868B (en) | 2019-12-20 | 2019-12-20 | Oil immersed transformer vibration analysis method considering insulating oil vibration inhibition effect |
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| Publication Number | Publication Date |
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| CN111159868A CN111159868A (en) | 2020-05-15 |
| CN111159868B true CN111159868B (en) | 2024-03-29 |
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| CN201911323664.0A Active CN111159868B (en) | 2019-12-20 | 2019-12-20 | Oil immersed transformer vibration analysis method considering insulating oil vibration inhibition effect |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140136586A (en) * | 2013-05-20 | 2014-12-01 | 한국 전기안전공사 | Diagnosis method and apparatus of transformer oil |
| CN107330286A (en) * | 2017-07-10 | 2017-11-07 | 华南理工大学 | A kind of large oil immersed power transformer reliability assessment dynamic correcting method |
| CN107563042A (en) * | 2017-08-29 | 2018-01-09 | 华北电力大学（保定） | A kind of converter power transformer compound field computational methods for considering thermograde |
| JP2018148052A (en) * | 2017-03-06 | 2018-09-20 | 東北電力株式会社 | Remaining life assessment method of oil-filled transformer and diagnostic system |
-
2019
- 2019-12-20 CN CN201911323664.0A patent/CN111159868B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140136586A (en) * | 2013-05-20 | 2014-12-01 | 한국 전기안전공사 | Diagnosis method and apparatus of transformer oil |
| JP2018148052A (en) * | 2017-03-06 | 2018-09-20 | 東北電力株式会社 | Remaining life assessment method of oil-filled transformer and diagnostic system |
| CN107330286A (en) * | 2017-07-10 | 2017-11-07 | 华南理工大学 | A kind of large oil immersed power transformer reliability assessment dynamic correcting method |
| CN107563042A (en) * | 2017-08-29 | 2018-01-09 | 华北电力大学（保定） | A kind of converter power transformer compound field computational methods for considering thermograde |
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| CN111159868A (en) | 2020-05-15 |
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