CN114088922B - Detection system for transformer insulation aging - Google Patents
Detection system for transformer insulation aging Download PDFInfo
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- CN114088922B CN114088922B CN202111314022.1A CN202111314022A CN114088922B CN 114088922 B CN114088922 B CN 114088922B CN 202111314022 A CN202111314022 A CN 202111314022A CN 114088922 B CN114088922 B CN 114088922B
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- 238000009413 insulation Methods 0.000 title claims abstract description 38
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 230000032683 aging Effects 0.000 title abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 75
- 238000012545 processing Methods 0.000 claims abstract description 28
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 238000012806 monitoring device Methods 0.000 claims description 27
- 238000004140 cleaning Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 14
- 230000015556 catabolic process Effects 0.000 claims description 9
- 238000006731 degradation reaction Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 abstract description 38
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011897 real-time detection Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 5
- 239000001913 cellulose Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010913 used oil Substances 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/14—Wipes; Absorbent members, e.g. swabs or sponges
- B08B1/143—Wipes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
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- Biochemistry (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention provides a detection system for transformer insulation aging, which constructs a set of simple and effective real-time detection system, carries out on-line analysis on the transformer insulation aging degree through effective data of oil temperature and micro water in oil, and achieves the effect of real-time early warning. The micro water sensor of the transformer insulating oil 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 collected micro water content and oil temperature data are processed and analyzed through the processing unit, 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 the power grid system of China, a plurality of power transformers with the running years being close to or exceeding the running time 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 as the insulation aging degree of the transformers is increased, the electrical performance and the mechanical performance of insulation materials are gradually reduced, the insulation performance and the short circuit resistance of the transformers are greatly reduced, and the running safety and the running reliability of the transformers are affected. The insulation aging causes the insulation material of the transformer to gradually reduce the original mechanical strength and insulation performance. Electromagnetic vibration and electrodynamic force generated in the operation of the transformer can easily cause mechanical damage of insulating materials of the transformer; and the breakdown field intensity of partial discharge, power frequency resistance and lightning impulse resistance is reduced when the insulation strength is reduced, and finally the insulation damage of the transformer is caused. According to analysis and statistical study of the insulation faults of various transformers by a power grid company, more than 90% of failure faults affecting the running state and service life of the transformers are insulation ageing problems.
Aging of the liquid immersion type transformer 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 means of degassing, oil filtering, oil changing and the like. However, once the insulating paper is aged, it is very difficult to replace it, so that the degree of aging of the insulating paper generally determines the theoretical service life of the liquid-immersed transformer. The main component of the insulating paper widely used in the liquid immersion type 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. However, the criteria for the service life termination are 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%, and the mechanical strength of the solid insulation is basically lost. It is considered that, in the case of a new paper having a polymerization degree of about 1000, the insulation life is at the middle and late stages when aging lowers the polymerization degree to 500.
Therefore, the scientific operation monitoring can improve the safe operation level of the transformer, defects are found in advance, and the method is very intentional in prolonging the whole life cycle of the transformer and improving the economic operation benefit; therefore, a detection system for transformer insulation degradation is proposed in view of the above-mentioned problems.
Disclosure of Invention
In order to make up the defects of the prior art and solve the problem that whether the insulating paper is difficult to detect aging or not, the invention provides a detection system for transformer insulation aging.
The technical scheme adopted for solving the technical problems is as follows: the invention relates to a detection system for transformer insulation aging, which comprises a processing unit, an early warning device, a data monitoring device and a small oil box; wherein;
and a processing unit: the oil temperature data transmitted by the 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:
data monitoring device: the data obtained by the processing unit are transmitted into the data monitoring device, and the data monitoring device monitors and analyzes whether the obtained data exceeds the standard:
early warning device: if the analysis result shows that the analysis result reaches the early warning value, the data monitoring device triggers the early warning device, and the early warning device gives an alarm.
Preferably, a connecting pipe is fixedly arranged on one side of the small oil box, a valve is arranged on the surface of the connecting pipe, a pipe joint is fixedly arranged at one end of the connecting pipe, which is far away from the small oil box, an oil tank is fixedly arranged at one end of the pipe joint, insulating oil is arranged in the oil tank, an iron core and a winding are arranged in the oil tank, a data transmission line is electrically connected at one end of the small oil box, which is far away from the connecting pipe, and a processing unit, an early warning device and a data monitoring device are electrically connected at one end of the data transmission line; during operation, through opening the valve, put into the oil tank with the insulating paper in the transformer this moment, the iron core and the winding in the oil tank begin to heat to in carrying little oily box through the coupling pipe with the insulating oil after the heating, thereby let little water sensor and the oil temperature sensor in the little oily box monitor insulating oil, pass back processing unit with the data of monitoring through the data transmission line, processing unit transmits data to data monitoring devices again, if exceeds standard, data monitoring devices transmits early warning device again, report to the police.
Preferably, two convex arms are fixedly arranged on one side of the small oil box, a fixed plate is fixedly arranged at one end, close to each other, of each convex arm, a sliding plate is connected to one side of each fixed plate in a sliding manner, a sliding block is connected to one side of each sliding plate in a sliding manner, two fixed frames are fixedly sleeved on the surface of each sliding block, and cleaning sponge blocks are arranged inside the fixed frames; during operation, through the sliding plate in the slip fixed plate for the sliding plate is worn the top of slider and fixed frame slip to little oil box, and the slider slides again, and the slider is worn two fixed frames to remove in the little oil box, makes two fixed frames take clean sponge piece to aim at little water sensor and oil temperature sensor, and the slider slides again, and the slider is worn two fixed frames to little water sensor and oil temperature sensor removal, makes the clean sponge piece in the fixed frame clean little water sensor and oil temperature sensor, and then will use up little water sensor and oil temperature sensor clean, avoids having insulating oil on little water sensor and the oil temperature sensor, makes things convenient for little water sensor and oil temperature sensor's the 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 mother surface; during operation is through putting clean sponge piece in fixed frame for the magic is pasted female face on clean sponge piece lateral wall and is aimed at the magic facial sub-face in the fixed frame, and then is fixed with clean sponge piece, realizes dismantling clean sponge piece fast, conveniently changes clean sponge piece after the dirty.
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 is pressed to extrude the spring and the sliding block, and when the sliding block is not used, the spring is used for carrying the sliding block and the fixed frame to reset, so that the automatic reset of the sliding block is realized.
Preferably, a baffle is fixedly arranged at one end of the sliding plate, and a buffer sheet is fixedly arranged at one end of the baffle, which is close to the sliding plate; during operation, when the slider removes, the baffle can prevent that the slider from sliding, avoids the slider to follow the fixed plate and goes up the landing, and the buffer piece on the baffle plays buffering, anticollision, avoids the baffle direct impact fixed plate, leads to the baffle to damage.
Preferably, a rectangular plate is fixedly arranged on one side of the fixed plate, two limit 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 arranged at one end of the sliding rod, and two through grooves are formed in the surface of the sliding block; when the sliding block is not used in operation, the sliding block slides towards the direction of the fixed plate, so that the sliding block slides towards the direction of the rectangular plate, two through grooves on the sliding block and the limiting block are on the same straight line, the sliding rod slides, the sliding rod passes through the through grooves of the sliding block with the limiting block to enter the limiting grooves of the rectangular plate to be clamped tightly, and then the sliding block and the fixed frame are fixed when the sliding block is not used.
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, insulating paper in the transformer is placed in the oil tank at the moment, 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, the 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 exceeds the standard, the data monitoring device transmits the data to the early warning device for warning.
2. According to the invention, the sliding plate in the fixed plate is slid to the upper part of the small oil box by sliding the sliding plate with the sliding block and the fixed frames, then the sliding block is slid to the inside of the small oil box by sliding the sliding block with the two fixed frames, so that the two fixed frames are aligned with the micro water sensor and the oil temperature sensor by the cleaning sponge blocks, then the sliding block is slid to the micro water sensor and the oil temperature sensor by the sliding block with the two fixed frames, so that the micro water sensor and the oil temperature sensor are wiped clean by the cleaning sponge blocks in the fixed frames, and then the used micro water sensor and oil temperature sensor are wiped clean, thereby avoiding insulating oil on the micro water sensor and the oil temperature sensor, and facilitating the next use of the micro water sensor and the oil temperature sensor.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a system block diagram in a first embodiment;
FIG. 2 is a schematic diagram of a transformer insulation degradation detection system according to a first embodiment;
FIG. 3 is a schematic view of a cam in an embodiment;
FIG. 4 is a schematic diagram of the structure at B in FIG. 3 according to the first embodiment;
FIG. 5 is a schematic diagram of the structure A in FIG. 3 according to the first embodiment;
FIG. 6 is a schematic structural diagram of a fixing frame in the first embodiment;
FIG. 7 is a graph showing the relationship among the aging degree of the insulating paper, the water content in the paper and the water content in the oil in the first embodiment;
FIG. 8 is a graph showing the relationship between the micro water content variation of the insulating oil and the polymerization degree of the insulating paper in the first embodiment;
FIG. 9 is a schematic diagram of a theoretical life evaluation curve of a transformer in the first embodiment;
FIG. 10 is a graph showing the relationship between the variation of transformer oil temperature and the micro-water content of insulating oil when the degree of polymerization of the insulating paper of the transformer in the first embodiment is 1000;
FIG. 11 is a graph showing the relationship between the variation of transformer oil temperature and the micro-water content of insulating oil when the degree of polymerization of the insulating paper of the transformer in the first embodiment is 700;
FIG. 12 is a graph showing the relationship between the variation of transformer oil temperature and the micro-water content of insulating oil when the degree of polymerization of the insulating paper of the transformer in the first embodiment is 500;
FIG. 13 is a graph showing the relationship between the micro water content change rate of the insulating oil and the polymerization degree of the insulating paper in the second embodiment.
In the figure: 1. an oil tank; 2. a 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 protruding arm; 16. a fixing plate; 17. a sliding plate; 18. a slide block; 19. a fixed frame; 20. cleaning the sponge block; 21. a magic tape surface; 22. a magic tape mother surface; 23. pulling a plate; 24. a spring; 25. a baffle; 26. a buffer sheet; 27. a rectangular plate; 28. a limit groove; 29. a slide bar; 30. and a limiting block.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
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 data of the oil temperature 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:
data monitoring device 13: the data obtained by the processing unit 11 are transmitted to the 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 pre-warning value is reached, the data monitoring device 13 triggers the pre-warning device 12, and the pre-warning device 12 gives an alarm.
A connecting pipe 7 is fixedly arranged 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 arranged at one end of the connecting pipe 7 far away from the small oil box 10, an oil tank 1 is fixedly arranged at one end of the pipe joint 5, insulating oil 4 is arranged in the oil tank 1, an iron core 2 and a winding 3 are arranged in the oil tank 1, a data transmission line 14 is electrically connected at one end of the small oil box 10 far away from the connecting pipe 7, and a processing unit 11, an early warning device 12 and a data monitoring device 13 are electrically connected at one end of the data transmission line 14; during operation, the valve 6 is opened, insulating paper in the transformer is placed in the oil tank 1 at the moment, 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 joint 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, monitored data are transmitted back to the processing unit 11 through the data output transmission line, the processing unit 11 transmits the data to the data monitoring device 13, and if the data exceeds the standard, the data monitoring device 13 transmits the data to the early warning device 12 for warning.
Two convex arms 15 are fixedly arranged on one side of the small oil box 10, a fixed plate 16 is fixedly arranged at one end, close to each other, of each convex arm 15, a sliding plate 17 is connected to one side of the fixed plate 16 in a sliding manner, a sliding block 18 is connected to one side of the sliding plate 17 in a sliding manner, two fixed frames 19 are fixedly sleeved on the surface of the sliding block 18, and a cleaning sponge block 20 is arranged in each fixed frame 19; during operation, through the sliding plate 17 in the sliding fixed plate 16, the sliding plate 17 slides to the top of the small oil box 10 with the sliding block 18 and the fixed frame 19, then the sliding block 18 slides, the sliding block 18 moves to the inside of the small oil box 10 with the two fixed frames 19, so that the two fixed frames 19 align the micro water sensor 8 and the oil temperature sensor 9 with the cleaning sponge block 20, then the sliding block 18 slides, the sliding block 18 moves to the micro water sensor 8 and the oil temperature sensor 9 with the two fixed frames 19, the cleaning sponge block 20 in the fixed frame 19 wipes the micro water sensor 8 and the oil temperature sensor 9 clean, and then the used micro water sensor 8 and the used oil temperature sensor 9 are wiped clean, insulating oil 4 on the micro water sensor 8 and the oil temperature sensor 9 is avoided, and the next use of the micro water sensor 8 and the oil temperature sensor 9 is facilitated.
The inner wall of the fixed frame 19 is fixedly provided with a magic tape surface 21, and the side wall of the cleaning sponge block 20 is fixedly provided with a magic tape mother surface 22; during operation, through putting clean sponge piece 20 in fixed frame 19 for the magic is pasted female face 22 on clean sponge piece 20 lateral wall and is aimed at the magic and paste sub-face 21 in the fixed frame 19, and then fixes clean sponge piece 20, realizes dismantling clean sponge piece 20 fast, conveniently changes clean sponge piece 20 after having dirty.
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 of the spring 24 far away from the pulling plate 23 is fixedly connected with a sliding shaft of the sliding block 18; when the automatic reset device works, the pulling plate 23 is pressed to enable the pulling plate 23 to press the spring 24 and the sliding block 18, and when the sliding block 18 is not used, the spring 24 is used for carrying the sliding block 18 and the fixed frame 19 to reset, so that automatic reset of the sliding block 18 is achieved.
A baffle plate 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 plate 25 close to the sliding plate 17; when the sliding block 18 moves, the baffle 25 can prevent the sliding block 18 from sliding, the sliding block 18 is prevented from sliding off the fixed plate 16, the buffer sheet 26 on the baffle 25 plays roles in buffering and anti-collision, and the baffle 25 is prevented from directly impacting the fixed plate 16, so that the baffle 25 is prevented from being damaged.
A rectangular plate 27 is fixedly arranged on one side of the fixed plate 16, two limit grooves 28 are formed in one side of the rectangular plate 27, a sliding rod 29 is connected to one side of the fixed plate 16, close to the rectangular plate 27, a limit block 30 is fixedly arranged 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 in operation, 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, two through grooves on the sliding block 18 and the limiting block 30 are on the same straight line, the sliding rod 29 is slid, the sliding rod 29 passes through the through grooves of the sliding block 18 with the limiting block 30 to enter the limiting groove 28 of the rectangular plate 27 for clamping, and the sliding block 18 and the fixed frame 19 are fixed when the sliding block is not used.
The limiting block 30 is U-shaped, and a gasket is fixedly connected to the inner wall of the limiting block 30; in operation, the spacer acts to increase friction and better secure the slider 18 and stop 30.
Fig. 7 is a graph showing the relationship between the micro water content in the insulating oil and the water content of the insulating paper under the condition of a certain 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 at a certain value, 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 is generated between the insulating oil and the insulating paper, and a new equilibrium state is finally achieved. Therefore, with the variation of the load of the transformer and the variation of the day-night temperature difference, the oil temperature in the transformer will vary, so that the micro-water content of the insulating oil in the transformer will also increase or decrease. When the oil temperature rises, a part of the micro water in the insulating paper will be transferred into the insulating oil, whereas when the oil temperature falls, a part of the micro water in the insulating oil will be transferred into the insulating paper.
The graph shows the relationship between the water content in the paper and the water content in the oil at 60℃for insulating papers having a polymerization degree of 1000 (new paper), 700, 500. After the insulating paper starts to age, the cellulose molecular bond constituting the insulating paper gradually starts to break. And the higher the degree of aging of the insulating paper, the lower the tensile strength thereof. And as shown in fig. 7, the equilibrium relationship between the water content in the insulating paper and the insulating oil varies 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 easily 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 molecular bond of the insulating paper breaks and the moisture retention ability decreases. Also, in the case of the same water content in the paper, the higher the degree of aging of the insulating paper, the greater the water content in the insulating oil.
The effective data of the micro water in oil and the oil temperature of the transformer are serial data that the oil temperature of the transformer changes according to the load change, and the changed oil temperature causes the micro water content in the oil to change. In general, the load rate of the transformer is high in daytime and the ambient temperature is high, and the load rate is low in evening 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 micro water content in the insulating oil in one day of the insulating papers with three different polymerization degrees.
TABLE 1 micro-water change in insulating oil
As illustrated in fig. 7, 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 have a correlation.
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. An effective data ring of insulating paper with polymerization degree of 1000, 700, 500 is measured and recorded, and then the processing unit 11 calculates the average variation of micro water content in the oil within a certain variation range of the insulating oil temperature.
Next, the processing unit 11 estimates the polymerization degree of the transformer insulation paper from the amount of change in micro water in the oil. The amount of change in micro water in the insulating oil is correlated with the degree of polymerization of the insulating paper, and fig. 8 shows a correlation curve of the amount of change in micro water in the oil with the degree of polymerization of the insulating paper. For example, as shown in FIG. 8, the change amount of micro water in the oil and the polymerization degree of the insulating paper can be fitted by adopting the mathematical relation shown in the figure, and the polymerization degree of the insulating paper can be accurately reversely pushed according to the fitting formula
Example two
Referring to fig. 8, in a first comparative example, as another embodiment of the present invention, the processing unit 11 obtains the oil temperature data transmitted by the oil temperature sensor 9 and the moisture content of the oil measured by the micro water sensor 8, and processes the data to form data. The processing unit 11 then calculates the micro water change amount in the oil under the oil temperature change amount according to each effective data ring, and calculates the average value of the slope curve according to the change amounts of the two, for example, the micro water change amounts with the slopes of 1.5, 2.6 and 3.3 are respectively corresponding to one effective data ring in fig. 9, 10 and 11.
Next, the processing unit 11 estimates the degree of polymerization of the transformer insulation paper from the slope change amount. The rate of change of micro water in the insulating oil is correlated with the degree of polymerization of the insulating paper, and fig. 12 shows a correlation curve of the rate of change of micro water in the oil with the degree of polymerization of the insulating paper. For example, as shown in fig. 13, the change rate of micro water in oil and the polymerization degree of the insulating paper can be fitted by adopting a mathematical relation shown in the figure, and the polymerization degree of the insulating paper can be accurately reversely pushed according to the fitting formula.
The fitting formula is: degree of polymerization dp= -277.77 x slope +1416.66 of insulating paper.
And the early warning device 12 evaluates the aging degree of the transformer insulation paper in stages. For example, the calculated polymerization degree value is based on the criterion in the "DL/T984-2005 oil immersed transformer insulation aging judgment guide", and the polymerization degree of the new transformer paper insulation is mostly about 1000. Tests show that the tensile strength and the like of the paper gradually decrease along with the decrease of the polymerization degree, and when the polymerization degree is reduced to 250, the tensile strength is suddenly reduced, which indicates the deep aging of the paper; the insulation paper completely loses mechanical strength at a degree of polymerization of about 150, and it is recommended that attention be paid to the aging of the paper insulation of the transformer when the degree of polymerization of the paper or board sample collected in the transformer is reduced to 250; when the degree of polymerization of the paper or board 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 polymerization of paper insulation of transformers
Fig. 13 is a theoretical life evaluation graph of a transformer, from which the theoretical remaining life of the transformer can be estimated based on the calculated degree of polymerization of the insulating paper of the transformer. For example, the warning device 12 calculates the theoretical remaining time for the polymerization degree to reach 500 and the theoretical remaining time for the polymerization degree to reach 250 according to the mathematical algorithm (y= (1-r) x, y: the polymerization degree of the insulating paper, x: the year, r: any number of 0-1) shown in fig. 8. Based on which the remaining useful life of the transformer can be briefly estimated.
As described above, the invention provides a detection system for transformer insulation aging, which constructs a set of simple and effective real-time detection system, and performs online analysis on the transformer insulation aging degree through effective data of oil temperature and micro water in the oil so as to achieve the effect of real-time early warning.
According to the working principle, through opening the valve 6, insulating paper in the transformer is placed in the oil tank 1 at the moment, the iron core 2 and the winding 3 in the oil tank 1 start to heat, and the heated insulating oil 4 is conveyed into the small oil box 10 through the pipe joint 5 and the pipe joint 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, monitored data are transmitted back to the processing unit 11 through the data transmission line, the processing unit 11 transmits the data to the data monitoring device 13, if the data exceeds the standard, the data monitoring device 13 transmits the data to the early warning device 12 again to give an alarm, when the sliding block 18 moves, the sliding block 18 is prevented from sliding through the sliding plate 17 in the sliding fixed plate 16, the buffer piece 26 on the baffle 25 plays a role in buffering, the sliding plate 17 slides to the upper side of the small oil box 10 with the sliding block 18 and the fixed frame 19, placing the cleaning sponge block 20 in the fixed frame 19, enabling the magic tape mother surface 22 on the side wall of the cleaning sponge block 20 to be aligned with the magic tape son surface 21 in the fixed frame 19, fixing the cleaning sponge block 20, pressing the pulling plate 23 to enable the pulling plate 23 to press the spring 24 and the sliding block 18, enabling the sliding block 18 to move towards the small oil box 10 with the two fixed frames 19, enabling the two fixed frames 19 to move towards the micro water sensor 8 and the oil temperature sensor 9 with the cleaning sponge block 20, sliding the sliding block 18, enabling the cleaning sponge block 20 in the fixed frame 19 to wipe the micro water sensor 8 and the oil temperature sensor 9 clean, further wiping the used micro water sensor 8 and the used oil temperature sensor 9 clean, avoiding insulating oil 4 on the micro water sensor 8 and the used oil temperature sensor 9, the convenient micro water sensor 8 and oil temperature sensor 9's use next time, when not using slider 18, bring slider 18 and fixed frame 19 through spring 24 to reset, and then realize the automatic re-setting of slider 18, when not using slider 18, slide slider 18 to fixed plate 16 direction for slider 18 slides to rectangular plate 27 direction, thereby let two logical grooves on the slider 18 and stopper 30 on same straight line, slide bar 29, slide bar 29 carries stopper 30 to pass the logical groove of slider 18 and gets into the clamping in the spacing groove 28 of rectangular plate 27, and then will not be used slider 18 and fixed frame 19 are fixed, the gasket plays the increase friction, better is fixed slider 18 and stopper 30.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 has shown and described the basic principles, principal 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, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (6)
1. A detection system for insulation degradation of a transformer, characterized by: comprises a processing unit (11), an early warning device (12), a data monitoring device (13) and a small oil box (10); wherein;
a processing unit (11): oil temperature data transmitted by an oil temperature sensor (9) in a small oil box (10) and water content in 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) are transmitted into the 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 analysis result reaches the early warning value, the data monitoring device (13) triggers the early warning device (12), and the early warning device (12) gives an alarm;
one side of the small oil box (10) is fixedly provided with a connecting pipe (7), the surface of the connecting pipe (7) is provided with a valve (6), one end of the connecting pipe (7) away from the small oil box (10) is fixedly provided with a pipe joint (5), one end of the pipe joint (5) is fixedly provided with an oil tank (1), the inside of the oil tank (1) is provided with insulating oil (4), an iron core (2) and a winding (3) are arranged in the oil tank (1), one end of the small oil box (10) away from the connecting pipe (7) 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);
two protruding arms (15) are fixedly installed on one side of the small oil box (10), two fixed plates (16) are fixedly installed at one ends, close to each other, of the protruding arms (15), a sliding plate (17) is connected to one side of the fixed plates (16) in a sliding mode, a sliding block (18) is connected to one side of the sliding plate (17) in a sliding mode, two fixing frames (19) are sleeved on the surface of the sliding block (18) in a fixed mode, and cleaning sponge blocks (20) are arranged inside the fixing frames (19).
2. A detection system for insulation degradation of a transformer according to claim 1, wherein: the inner wall of the fixed frame (19) is fixedly provided with a magic tape surface (21), and the side wall of the cleaning sponge block (20) is fixedly provided with a magic tape female surface (22).
3. A detection system for insulation degradation of a transformer according to claim 2, 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 of the spring (24) away from the pulling plate (23) is fixedly connected with a sliding shaft of the sliding block (18).
4. A detection system for insulation degradation of a transformer according to claim 3, 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).
5. A detection system for insulation degradation of a transformer according to claim 3, wherein: one side fixed mounting of fixed plate (16) has rectangular board (27), two spacing grooves (28) have been seted up to one side of rectangular board (27), one side sliding connection that fixed plate (16) are close to rectangular board (27) has slide bar (29), one end fixed mounting of slide bar (29) has stopper (30), two logical grooves have been seted up on the surface of slider (18).
6. A detection system for transformer insulation degradation 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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| CN116773987B (en) * | 2023-08-24 | 2023-10-31 | 北京中联太信科技有限公司 | Insulation level monitoring's on-line control system |
| CN117250456B (en) * | 2023-11-20 | 2024-01-30 | 山东海鲲数控设备有限公司 | Transformer insulation state monitoring system |
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