CN114088922A - Detection system for transformer insulation aging - Google Patents
Detection system for transformer insulation aging Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 46
- 230000032683 aging Effects 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 238000012545 processing Methods 0.000 claims abstract description 30
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 238000012806 monitoring device Methods 0.000 claims description 27
- 230000005540 biological transmission Effects 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 abstract description 38
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011897 real-time detection Methods 0.000 abstract description 2
- 238000004148 unit process Methods 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 64
- 238000004140 cleaning Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 229920002678 cellulose Polymers 0.000 description 5
- 239000001913 cellulose Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000011111 cardboard Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000010913 used oil Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 239000012774 insulation material Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention provides a detection system for transformer insulation aging, which constructs a set of simple and effective real-time detection system, and achieves the effect of real-time early warning by carrying out online analysis on the insulation aging degree of a transformer through effective data of oil temperature and micro water in oil. The transformer insulating oil micro-water sensor can detect the micro-water content in the transformer insulating oil in real time, the oil temperature sensor detects the temperature of the transformer insulating oil in real time, the processing unit processes and analyzes the collected micro-water content and oil temperature data, the polymerization degree value of the transformer insulating paper is deduced according to a preset algorithm, and the insulation aging degree of the transformer is judged according to the polymerization degree value.
Description
Technical Field
The invention relates to the field of transformers, in particular to a detection system for insulation aging of a transformer.
Background
At present, in a power grid system in China, a plurality of power transformers with the running life close to or exceeding the period exist, and due to the consideration of factors such as cost, the power transformers are still in working operation at present, so that one problem is that the electrical performance and the mechanical performance of an insulating material are gradually reduced along with the aggravation of the insulation aging degree of the transformer, the insulation performance and the short-circuit resistance of the transformer are greatly reduced, and the safety and the reliability of the operation of the transformer are influenced. And the insulation aging gradually reduces the original mechanical strength and insulation performance of the insulation material of the transformer. Therefore, the electromagnetic vibration and electrodynamic force generated in the operation of the transformer can easily cause the mechanical damage of the insulating material of the transformer; and the reduction of the insulation strength is easy to generate partial discharge, and the breakdown field intensity of power frequency resistance and lightning impulse resistance is reduced, so that the insulation damage of the transformer is finally caused. According to analysis and statistical research of various transformer insulation faults by a power grid company, more than 90% of failure faults affecting the running state and the service life of a transformer belong to the insulation aging problem.
Aging of liquid-immersed transformers is mainly caused by aging of insulating oil and insulating paper in the transformer. After the insulating oil is aged, the insulating oil can be treated by degassing, filtering, changing oil, or the like. However, once the insulation paper is aged, it is very difficult to replace it, so generally the degree of aging of the insulation paper determines the theoretical service life of the liquid-immersed transformer. The main component of the widely used insulating paper in the liquid-immersed transformer is cellulose, and the aging state of the insulating paper is judged by taking the average polymerization degree value of the cellulose as the basis. But the criterion for the service life termination is not unified at home and abroad, and the simulation test and the actual measurement result show that when the polymerization degree of the insulating paper is reduced to 250-300, the tensile strength of the solid insulation is reduced to about 30 percent, and the mechanical strength of the solid insulation is basically lost. It is considered that, when the polymerization degree of a new paper having a polymerization degree of about 1000 is lowered to 500 by aging, the insulation life is in the middle and late stages.
Therefore, scientific operation monitoring can improve the safe operation level of the transformer, detect defects in advance, and is very interesting for prolonging the whole life cycle of the transformer and improving economic operation benefits; therefore, a detection system for insulation aging of a transformer is provided to solve the above problems.
Disclosure of Invention
In order to make up for the defects of the prior art and solve the problem that the insulation paper is difficult to detect whether the insulation paper is aged, the invention provides a detection system for insulation aging of a transformer.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a detection system for insulation aging of a transformer, which comprises a processing unit, an early warning device, a data monitoring device and a small oil box, wherein the processing unit is used for processing the insulation aging of the transformer; wherein;
a processing unit: the oil temperature data transmitted by an oil temperature sensor in the small oil box and the water content in the oil measured by the micro-water sensor are obtained through a data transmission line, and the obtained data are processed:
the data monitoring device comprises: the data obtained by the processing unit can be transmitted to the data monitoring device, and the data monitoring device can monitor and analyze whether the obtained data exceeds the standard or not:
the early warning device: if the analysis result shows that the early warning value is reached, the data monitoring device triggers the early warning device, and the early warning device gives an alarm.
Preferably, a union is fixedly mounted on one side of the small oil box, a valve is arranged on the surface of the union, a pipe joint is fixedly mounted at one end of the union, which is far away from the small oil box, a fuel tank is fixedly mounted at one end of the pipe joint, insulating oil is arranged inside the fuel tank, an iron core and a winding are mounted in the fuel tank, one end of the small oil box, which is far away from the union, is electrically connected with a data transmission line, and one end of the data transmission line is electrically connected with a processing unit, an early warning device and a data monitoring device; during operation, through opening the valve, put into the oil tank with the insulating paper in the transformer this moment, iron core and winding in the oil tank begin to heat, and pass through the coupling union coupling with the insulating oil after the heating and carry in the tiny-oil box, thereby let little water sensor and oil temperature sensor in the tiny-oil box monitor insulating oil, the data that will monitor pass back processing unit through data play transmission line, processing unit sends data transfer to data monitoring device again, if exceed standard, data monitoring device resends early warning device, report to the police.
Preferably, two convex arms are fixedly mounted on one side of the small oil box, a fixed plate is fixedly mounted at one end of each of the two convex arms close to each other, a sliding plate is slidably connected to one side of the fixed plate, a sliding block is slidably connected to one side of the sliding plate, two fixed frames are fixedly sleeved on the surface of the sliding block, and a cleaning sponge block is arranged inside each fixed frame; during operation, through the sliding plate in the sliding fixed plate, make the sliding plate take slider and fixed frame to slide to the top of little oil box, the slider slides again, two fixed frames of slider area remove to little oil box, make two fixed frame areas clean sponge piece alignment trace water sensor and oil temperature sensor, the slider slides again, two fixed frames of slider area move to trace water sensor and oil temperature sensor, make the clean sponge piece in the fixed frame clean trace water sensor and oil temperature sensor, and then wipe the trace water sensor and the oil temperature sensor who uses up cleanly, avoid having insulating oil on trace water sensor and the oil temperature sensor, make things convenient for trace water sensor and oil temperature sensor's next use.
Preferably, the inner wall of the fixing frame is fixedly provided with a magic tape surface, and the side wall of the cleaning sponge block is fixedly provided with a magic tape female surface; the during operation is through putting clean sponge piece in fixed frame for the female face of magic subsides on the clean sponge piece lateral wall aims at the magic of fixed frame and pastes the son face, and then fixes clean sponge piece, realizes dismantling clean sponge piece fast, and the convenient clean sponge piece after will having dirty is changed.
Preferably, one end of the sliding block is fixedly provided with a pulling plate, one end of the pulling plate is fixedly provided with a spring, and one end of the spring, which is far away from the pulling plate, is fixedly connected with a sliding shaft of the sliding block; when the automatic reset device works, the pulling plate extrudes the spring and the sliding block by pressing the pulling plate, and when the sliding block is not used, the sliding block and the fixed frame are driven to reset by the spring, so that the automatic reset of the sliding block is realized.
Preferably, a baffle is fixedly mounted at one end of the sliding plate, and a buffer sheet is fixedly mounted at one end of the baffle close to the sliding plate; during operation, when the slider moves, the baffle can prevent that the slider from sliding, avoids the slider landing from the fixed plate, and the buffer plate on the baffle plays the effect of buffering, anticollision, avoids the direct striking fixed plate of baffle, leads to the baffle to damage.
Preferably, a rectangular plate is fixedly mounted on one side of the fixed plate, two limiting grooves are formed in one side of the rectangular plate, a sliding rod is connected to one side, close to the rectangular plate, of the fixed plate in a sliding mode, a limiting block is fixedly mounted at one end of the sliding rod, and two through grooves are formed in the surface of the sliding block; during operation, when not using the slider, slide the slider to the fixed plate direction for the slider slides to the rectangular plate direction, thereby lets two logical grooves and stopper on the slider on same straight line, slides the slide bar, and the slide bar area stopper passes logical groove entering rectangular plate's that the slider passes limiting groove chucking, and then the slider when will not using is fixed with fixed frame.
Preferably, the limiting block is U-shaped, and a gasket is fixedly connected to the inner wall of the limiting block; during operation, the gasket plays the increase friction, better fixes slider and stopper.
The invention has the advantages that:
1. according to the invention, the valve is opened, the insulating paper in the transformer is placed into the oil tank, the iron core and the winding in the oil tank start to be heated, and the heated insulating oil is conveyed into the small oil box through the pipe joint connecting pipe, so that the micro-water sensor and the oil temperature sensor in the small oil box monitor the insulating oil, monitored data are transmitted back to the processing unit through the data output transmission line, the processing unit transmits the data to the data monitoring device, and if the data exceed the standard, the data monitoring device transmits the data to the early warning device to give an alarm.
2. According to the invention, the sliding plate in the fixed plate is slid to slide the sliding plate with the sliding block and the fixed frame to the upper part of the small oil box, then the sliding block is slid, the sliding block drives the two fixed frames to move towards the small oil box, so that the two fixed frames drive the cleaning sponge block to be aligned with the micro water sensor and the oil temperature sensor, then the sliding block is slid, the sliding block drives the two fixed frames to move towards the micro water sensor and the oil temperature sensor, the cleaning sponge block in the fixed frame cleans the micro water sensor and the oil temperature sensor, and the used micro water sensor and the used oil temperature sensor are cleaned, so that insulating oil is prevented from being arranged on the micro water sensor and the oil temperature sensor, and the micro water sensor and the oil temperature sensor can be conveniently used next time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a block diagram of a system according to a first embodiment;
FIG. 2 is a schematic diagram of a system for detecting insulation degradation of a transformer according to an embodiment;
FIG. 3 is a schematic structural diagram of a protruding arm according to an embodiment;
FIG. 4 is a schematic diagram of a structure at B in FIG. 3 according to a first embodiment;
FIG. 5 is a schematic diagram of a structure shown in FIG. 3 according to an embodiment;
FIG. 6 is a schematic structural diagram of a center fixing frame according to an embodiment;
FIG. 7 is a graph showing the relationship between the degree of aging of the insulating paper, the water content in the paper, and the water content in the oil according to the first embodiment;
FIG. 8 is a graph showing a correlation between the variation of the moisture content of the insulating oil and the degree of polymerization of the insulating paper in the first embodiment;
FIG. 9 is a schematic diagram illustrating a theoretical life evaluation curve of a transformer according to an embodiment;
FIG. 10 is a schematic diagram illustrating a relationship between a transformer oil temperature variation and a slight moisture content of insulating oil when a degree of polymerization of insulating paper of the transformer is 1000 according to the first embodiment;
FIG. 11 is a schematic diagram illustrating a relationship between a transformer oil temperature variation and a slight moisture content of insulating oil when a polymerization degree of insulating paper of the transformer is 700 according to the first embodiment;
FIG. 12 is a schematic diagram illustrating a relationship between a transformer oil temperature variation and a slight moisture content of insulating oil when a polymerization degree of insulating paper of the transformer is 500 in the first embodiment;
FIG. 13 is a graph showing the correlation between the change rate of the moisture content of the insulating oil and the degree of polymerization of the insulating paper in example two.
In the figure: 1. an oil tank; 2. an iron core; 3. a winding; 4. insulating oil; 5. a pipe joint; 6. a valve; 7. connecting pipes; 8. a micro-water sensor; 9. an oil temperature sensor; 10. a small oil box; 11. a processing unit; 12. an early warning device; 13. a data monitoring device; 14. a data transmission line; 15. a convex arm; 16. a fixing plate; 17. a sliding plate; 18. a slider; 19. a fixing frame; 20. cleaning the sponge block; 21. a magic tape surface; 22. magic tape mother surface; 23. pulling a plate; 24. a spring; 25. a baffle plate; 26. a buffer sheet; 27. a rectangular plate; 28. a limiting groove; 29. a slide bar; 30. and a limiting block.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1-12, a detection system for insulation aging of a transformer includes a processing unit 11, an early warning device 12, a data monitoring device 13, and a small oil box 10; wherein;
the processing unit 11: the oil temperature data transmitted by the oil temperature sensor 9 in the small oil box 10 and the water content in the oil measured by the micro-water sensor 8 are obtained through the data transmission line 14, and the obtained data are processed:
the data monitoring device 13: the data obtained by the processing unit 11 is transmitted to the data monitoring device 13, and the data monitoring device 13 monitors and analyzes whether the obtained data exceeds a standard:
the early warning device 12: if the analysis result shows that the early warning value is reached, the data monitoring device 13 will trigger the early warning device 12, and the early warning device 12 gives an alarm.
A connecting pipe 7 is fixedly installed on one side of the small oil box 10, a valve 6 is arranged on the surface of the connecting pipe 7, a pipe joint 5 is fixedly installed at one end, far away from the small oil box 10, of the connecting pipe 7, an oil tank 1 is fixedly installed at one end of the pipe joint 5, insulating oil 4 is arranged inside the oil tank 1, an iron core 2 and a winding 3 are installed inside the oil tank 1, one end, far away from the connecting pipe 7, of the small oil box 10 is electrically connected with a data transmission line 14, and one end of the data transmission line 14 is electrically connected with a processing unit 11, an early warning device 12 and a data monitoring device 13; during operation, through opening valve 6, put into oil tank 1 with the insulating paper in the transformer this moment, iron core 2 and winding 3 in the oil tank 1 begin to heat, and carry little oil box 10 through 5 antithetical couplets of pipe joints 7 with insulating oil 4 after the heating, thereby let little water sensor 8 and oil temperature sensor 9 in the little oil box 10 monitor insulating oil 4, the data that will monitor pass back processing unit 11 through data play transmission line, processing unit 11 is data transfer to data monitoring device 13 again, if exceed standard, data monitoring device 13 retransmits for early warning device 12, report to the police.
Two convex arms 15 are fixedly installed on one side of the small oil box 10, a fixed plate 16 is fixedly installed at one end, close to each other, of each convex arm 15, a sliding plate 17 is connected to one side of each fixed plate 16 in a sliding mode, a sliding block 18 is connected to one side of each sliding plate 17 in a sliding mode, two fixed frames 19 are fixedly sleeved on the surfaces of the sliding blocks 18, and a cleaning sponge block 20 is arranged inside each fixed frame 19; when the oil temperature sensor is in work, the sliding plate 17 in the fixed plate 16 slides to the upper side of the small oil box 10 with the sliding block 18 and the fixed frame 19, the sliding block 18 slides again, the sliding block 18 moves towards the small oil box 10 with the two fixed frames 19, the two fixed frames 19 are aligned to the micro water sensor 8 and the oil temperature sensor 9 with the cleaning sponge block 20, the sliding block 18 slides again, the sliding block 18 moves towards the micro water sensor 8 and the oil temperature sensor 9 with the two fixed frames 19, the micro water sensor 8 and the oil temperature sensor 9 are cleaned by the cleaning sponge block 20 in the fixed frame 19, the micro water sensor 8 and the oil temperature sensor 9 which are used up are further cleaned, insulating oil 4 is prevented from being arranged on the micro water sensor 8 and the oil temperature sensor 9, and the micro water sensor 8 and the oil temperature sensor 9 can be conveniently used next time.
A magic tape surface 21 is fixedly arranged on the inner wall of the fixing frame 19, and a magic tape female surface 22 is fixedly arranged on the side wall of the cleaning sponge block 20; the during operation is through putting clean sponge piece 20 in fixed frame 19 for the female face 22 of magic subsides on the clean sponge piece 20 lateral wall aligns the magic tape face 21 in the fixed frame 19, and then will clean sponge piece 20 fixed, realizes dismantling clean sponge piece 20 fast, and convenient clean sponge piece 20 after will having dirty is changed.
A pulling plate 23 is fixedly installed at one end of the sliding block 18, a spring 24 is fixedly installed at one end of the pulling plate 23, and one end, far away from the pulling plate 23, of the spring 24 is fixedly connected with a sliding shaft of the sliding block 18; when the automatic resetting device works, the pulling plate 23 is pressed to enable the pulling plate 23 to extrude the spring 24 and the sliding block 18, and when the sliding block 18 is not used, the sliding block 18 and the fixed frame 19 are driven to reset through the spring 24, so that the sliding block 18 is automatically reset.
A baffle 25 is fixedly arranged at one end of the sliding plate 17, and a buffer sheet 26 is fixedly arranged at one end of the baffle 25 close to the sliding plate 17; during operation, when the slider 18 moves, the baffle 25 can prevent the slider 18 from sliding, and prevent the slider 18 from sliding off the fixed plate 16, and the buffer sheet 26 on the baffle 25 plays the role of buffering and anti-collision, and prevents the baffle 25 from directly impacting the fixed plate 16, so that the baffle 25 is damaged.
A rectangular plate 27 is fixedly installed on one side of the fixed plate 16, two limiting grooves 28 are formed in one side of the rectangular plate 27, a sliding rod 29 is connected to one side, close to the rectangular plate 27, of the fixed plate 16 in a sliding mode, a limiting block 30 is fixedly installed at one end of the sliding rod 29, and two through grooves are formed in the surface of the sliding block 18; when the sliding block 18 is not used, the sliding block 18 slides towards the direction of the fixed plate 16, so that the sliding block 18 slides towards the direction of the rectangular plate 27, the two through grooves in the sliding block 18 and the limiting block 30 are in the same straight line, the sliding rod 29 slides, the sliding rod 29 drives the limiting block 30 to penetrate through the through grooves in the sliding block 18 to enter the limiting groove 28 in the rectangular plate 27 for clamping, and the sliding block 18 and the fixed frame 19 are fixed when not used.
The limiting block 30 is U-shaped, and a gasket is fixedly connected to the inner wall of the limiting block 30; during operation, the gasket increases friction and better fixes the sliding block 18 and the limiting block 30.
Fig. 7 is a graph showing the correlation between the moisture content of the insulating paper and the micro-moisture content of the insulating oil under a constant oil temperature. The micro water in the transformer is mainly dissolved in the insulating oil and the cellulose insulating paper in the transformer, and when the temperature of the insulating oil is kept for a certain time, the micro water content between the insulating oil and the cellulose insulating paper reaches an equilibrium state. When the temperature of the insulating oil changes, micro-water transfer occurs between the insulating oil and the insulating paper and a new equilibrium state is finally reached. Therefore, as the load of the transformer changes and the temperature difference between day and night changes, the temperature of the oil in the transformer changes, and the micro water content of the insulating oil in the transformer also changes. When the oil temperature rises, a part of the micro water in the insulating paper will be transferred to the insulating oil, and conversely, when the oil temperature falls, a part of the micro water in the insulating oil will be transferred to the insulating paper.
The graph shows the relationship between the water content in paper and the water content in oil for insulating paper with polymerization degree of 1000 (new paper), 700, 500 at oil temperature of 60 ℃. After the insulation paper starts to age, the cellulose molecular bonding bonds constituting the insulation paper gradually start to break. And the higher the aging degree of the insulating paper, the lower the tensile strength thereof. And as shown in fig. 7, the equilibrium relationship between the moisture content in the insulating paper and the moisture content in the insulating oil differs depending on the degree of aging of the insulating paper. As shown in fig. 7, the higher the degree of aging of the insulating paper, the more likely the moisture in the insulating paper migrates into the insulating oil. This is because the higher the degree of aging of the insulating paper, the lower the moisture retention ability due to the breakdown of the molecular bond of the insulating paper. Also, the higher the degree of aging of the insulating paper, the greater the water content in the insulating oil, for the same water content in the paper.
The data measurement of the transformer insulation aging detection system is further described herein, and the effective data of the micro water in oil and the oil temperature refers to series of data that the transformer changes the oil temperature of the transformer according to the load change, and the changed oil temperature causes the micro water content in the oil to change. In general, the transformer load factor is high in daytime and the ambient temperature is high, and the transformer load factor is low at night and the ambient temperature is low, so that real-time data of one day can be used as an effective data ring. Table 1 shows the variation of the amount of water in the insulating oil in one day for three insulating papers with different degrees of polymerization.
TABLE 1 micro water variation in insulating oil
As illustrated in fig. 7, there is a correlation between the oil temperature, the degree of aging (degree of polymerization) of the insulating paper, the moisture content of the insulating paper, and the micro-moisture content in the oil.
The processing unit 11 obtains the oil temperature data transmitted by the oil temperature sensor 9 and the water content in the oil measured by the micro-water sensor 8, and processes the data to form data. An effective data ring of the insulating paper with the polymerization degree of 1000, 700 and 500 is measured and recorded, and then the processing unit 11 calculates the average variation of the micro-water content in the insulating oil within a certain variation range of the temperature of the insulating oil.
Next, the processing unit 11 estimates the degree of polymerization of the transformer insulating paper from the amount of change in the minute water in the oil. The variation of the micro water in the insulating oil is related to the degree of polymerization of the insulating paper, and fig. 8 shows a correlation curve of the variation of the micro water in the oil and the degree of polymerization of the insulating paper. For example, as shown in fig. 8, the amount of change of the micro water in the oil and the degree of polymerization of the insulating paper can be fitted by using the mathematical relational expression shown in the figure, and the degree of polymerization of the insulating paper can be accurately and reversely deduced according to the fitted formula
Example two
Referring to fig. 8, in a first comparative example, as another implementation manner of the present invention, the processing unit 11 obtains the oil temperature data transmitted by the oil temperature sensor 9 and the moisture content in the oil measured by the micro-water sensor 8, and processes the data to form data. Then, the processing unit 11 calculates the variation of the micro water in the oil under the variation of the oil temperature according to each effective data ring, and calculates the average value of the slope curve according to the variation of the two effective data rings, for example, in fig. 9, 10, and 11, one effective data ring corresponds to the variation of the micro water with the slope of 1.5, 2.6, and 3.3, respectively.
Next, the processing unit 11 estimates the degree of polymerization of the transformer insulating paper from the slope change amount. The variation rate of the micro-water in the insulating oil is related to the degree of polymerization of the insulating paper, and fig. 12 shows a correlation curve of the variation rate of the micro-water in the oil and the degree of polymerization of the insulating paper. For example, as shown in fig. 13, the mathematical relation shown in the figure can be used for fitting between the change rate of the micro water in the oil and the polymerization degree of the insulating paper, and the polymerization degree of the insulating paper can be accurately and reversely deduced according to the fitting formula.
The fitting formula is: the degree of polymerization DP of the insulating paper was-277.77 × slope + 1416.66.
Meanwhile, the early warning device 12 evaluates the aging degree of the transformer insulation paper in stages. For example, the calculated polymerization degree value is determined according to the criterion in the insulation aging judgment guide rule of DL/T984-2005 oil-immersed transformer, and the polymerization degree of the paper insulation of the new transformer is mostly about 1000. Tests show that the tensile strength and the like of the paper are gradually reduced along with the reduction of the polymerization degree, when the polymerization degree is reduced to 250, the tensile strength is suddenly reduced, and the deep aging of the paper is indicated; at a degree of polymerization of about 150, the insulating paper loses mechanical strength completely, suggesting that when the degree of polymerization of the paper or cardboard sample collected in the transformer is reduced to 250, attention should be paid to the aging of the paper insulation of the transformer; when the degree of polymerization of the paper or cardboard sample is reduced to approximately 150, the transformer should be considered out of service. The specific criteria are shown in Table 2 below
TABLE 2 criterion for degree of insulation polymerization of transformer paper
FIG. 13 is a graph of theoretical life evaluation of a transformer, which can be used to calculate the theoretical remaining useful life of the transformer according to the calculated degree of polymerization of the insulation paper of the transformer. For example, the warning device 12 calculates the theoretical remaining time until the degree of polymerization reaches 500 and the theoretical remaining time until the degree of polymerization reaches 250 according to a mathematical algorithm (y is (1-r) x, y is the degree of polymerization of the insulating paper, x is year, r is any number of 0-1) as shown in fig. 8. On the basis of which the remaining useful life of the transformer can be briefly estimated.
As mentioned above, the invention provides a detection system for transformer insulation aging, a set of simple, convenient and effective real-time detection system is constructed, and the transformer insulation aging degree is analyzed on line through effective data of oil temperature and micro water in oil, so that the real-time early warning effect is achieved.
The working principle is that by opening the valve 6, at this time, the insulating paper in the transformer is put into the oil tank 1, the iron core 2 and the winding 3 in the oil tank 1 start to be heated, and the heated insulating oil 4 is conveyed into the small oil box 10 through the pipe joint 5 and the pipe 7, so that the micro water sensor 8 and the oil temperature sensor 9 in the small oil box 10 monitor the insulating oil 4, the monitored data is transmitted back to the processing unit 11 through the data output transmission line, the processing unit 11 then transmits the data to the data monitoring device 13, if the data exceeds the standard, the data monitoring device 13 then transmits the data to the early warning device 12 to give an alarm, through the sliding plate 17 in the sliding fixing plate 16, when the sliding block 18 moves, the baffle plate 25 can prevent the sliding block 18 from sliding over, and prevent the sliding block 18 from sliding off the fixing plate 16, and the buffer sheet 26 on the baffle plate 25 plays the roles of buffering and anti-collision, so that the sliding plate 17 with the sliding block 18 and the fixing frame 19 slide to the upper part of the small oil box 10, the cleaning sponge block 20 is placed in the fixing frame 19, the hook and loop fastener surface 22 on the side wall of the cleaning sponge block 20 is aligned to the hook and loop fastener surface 21 in the fixing frame 19, the cleaning sponge block 20 is further fixed, the pulling plate 23 is pressed to extrude the spring 24 and the sliding block 18, the sliding block 18 drives the two fixing frames 19 to move in the small oil box 10, the two fixing frames 19 drive the cleaning sponge block 20 to be aligned to the micro water sensor 8 and the oil temperature sensor 9, the sliding block 18 is slid again, the sliding block 18 drives the two fixing frames 19 to move towards the micro water sensor 8 and the oil temperature sensor 9, the cleaning sponge block 20 in the fixing frame 19 wipes the micro water sensor 8 and the oil temperature sensor 9 cleanly, the used micro water sensor 8 and the used oil temperature sensor 9 are wiped cleanly, the insulating oil 4 is prevented from being arranged on the micro water sensor 8 and the oil temperature sensor 9, and the micro water sensor 8 and the oil temperature sensor 9 can be conveniently used next time, when the sliding block 18 is not used, the sliding block 18 and the fixed frame 19 are driven to reset through the spring 24, so that automatic resetting of the sliding block 18 is realized, when the sliding block 18 is not used, the sliding block 18 slides towards the direction of the fixed plate 16, the sliding block 18 slides towards the direction of the rectangular plate 27, so that the two through grooves in the sliding block 18 and the limiting block 30 are on the same straight line, the sliding slide rod 29 slides, the sliding rod 29 drives the limiting block 30 to penetrate through the through groove in the sliding block 18 to enter the limiting groove 28 in the rectangular plate 27 to be clamped tightly, the sliding block 18 and the fixed frame 19 are further fixed when the sliding block is not used, the gasket increases friction, and the sliding block 18 and the limiting block 30 are better fixed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (8)
1. A detection system for transformer insulation aging, characterized in that: comprises a processing unit (11), an early warning device (12), a data monitoring device (13) and a small oil box (10); wherein;
processing unit (11): the oil temperature data transmitted by an oil temperature sensor (9) in the small oil box (10) and the water content in the oil measured by a micro water sensor (8) are obtained through a data transmission line (14), and the obtained data are processed:
data monitoring device (13): the data obtained by the processing unit (11) is transmitted to a data monitoring device (13), and the data monitoring device (13) monitors and analyzes whether the obtained data exceeds the standard:
early warning device (12): if the analysis result shows that the early warning value is reached, the data monitoring device (13) triggers the early warning device (12), and the early warning device (12) gives an alarm.
2. The system for detecting insulation aging of a transformer according to claim 1, wherein: one side fixed mounting of little oil box (10) has antithetical couplet pipe (7), the surface of antithetical couplet pipe (7) is equipped with valve (6), the one end fixed mounting that little oil box (10) were kept away from in antithetical couplet pipe (7) has coupling (5), the one end fixed mounting of coupling (5) has oil tank (1), the inside of oil tank (1) is equipped with insulating oil (4), install iron core (2) and winding (3) in oil tank (1), the one end electric connection that antithetical couplet pipe (7) was kept away from in little oil box (10) has data transmission line (14), the one end electric connection of data transmission line (14) has processing unit (11), early warning device (12) and data monitoring device (13).
3. The system for detecting insulation aging of a transformer according to claim 2, wherein: one side fixed mounting of little oil box (10) has two convex arms (15), two one end fixed mounting that convex arm (15) are close to each other has fixed plate (16), one side sliding connection of fixed plate (16) has sliding plate (17), one side sliding connection of sliding plate (17) has slider (18), the fixed surface cover of slider (18) has two fixed frames (19), the inside of fixed frame (19) is equipped with clean sponge piece (20).
4. A detection system for transformer insulation aging according to claim 3, characterized in that: the inner wall fixed mounting magic of fixed frame (19) pastes sub-face (21), the lateral wall fixed mounting of clean sponge piece (20) pastes female face (22) with the magic.
5. The system for detecting insulation aging of a transformer according to claim 4, wherein: one end of the sliding block (18) is fixedly provided with a pulling plate (23), one end of the pulling plate (23) is fixedly provided with a spring (24), and one end, far away from the pulling plate (23), of the spring (24) is fixedly connected with a sliding shaft of the sliding block (18).
6. The system for detecting insulation aging of a transformer according to claim 5, wherein: one end of the sliding plate (17) is fixedly provided with a baffle plate (25), and one end of the baffle plate (25) close to the sliding plate (17) is fixedly provided with a buffer sheet (26).
7. The system for detecting insulation aging of a transformer according to claim 5, wherein: one side fixed mounting of fixed plate (16) has rectangular plate (27), two spacing grooves (28) have been seted up to one side of rectangular plate (27), one side sliding connection that fixed plate (16) is close to rectangular plate (27) has slide bar (29), the one end fixed mounting of slide bar (29) has stopper (30), two logical grooves have been seted up on the surface of slider (18).
8. The system for detecting insulation aging of a transformer according to claim 5, wherein: the limiting block (30) is U-shaped, and a gasket is fixedly connected to the inner wall of the limiting block (30).
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