CN116718131B - Digital abnormality alarm system of current transformer for transformer substation - Google Patents
Digital abnormality alarm system of current transformer for transformer substation Download PDFInfo
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- CN116718131B CN116718131B CN202310573660.8A CN202310573660A CN116718131B CN 116718131 B CN116718131 B CN 116718131B CN 202310573660 A CN202310573660 A CN 202310573660A CN 116718131 B CN116718131 B CN 116718131B
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- 230000005856 abnormality Effects 0.000 title claims abstract description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000007747 plating Methods 0.000 claims description 14
- 238000012549 training Methods 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000003062 neural network model Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
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- 239000007789 gas Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
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- 229910052709 silver Inorganic materials 0.000 description 2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
The invention discloses a digital abnormality alarm system of a current transformer for a transformer substation, which belongs to the technical field of fault detection of transformer substation equipment, and comprises a light source arranged on the inner top wall of an upper cover and at the central position, wherein the light source emits light rays perpendicular to the upper cover; around the light source, a plurality of brightness sensor matrixes are arranged in a surrounding mode; a reflecting device which is horizontally arranged is arranged right below the light source; the reflecting device comprises a balancing weight right below the light source, the balancing weight is connected with the edge of the upper cover through a spring, a circular reflecting mirror is arranged at the center of the balancing weight, circular shading films with different shading rates are sequentially attached to the center of the reflecting mirror outwards, and the shading rate of the shading films is increased along with the increase of the outer diameter; the processor is connected with the brightness sensor matrix and used for confirming the inclination angle of the upper cover; to alert the current transformer to internal pressure changes.
Description
Technical Field
The invention belongs to the technical field of fault detection of substation equipment, and particularly relates to a digital abnormality alarm system of a current transformer for a substation.
Background
The current transformer is an electric power device for measuring current and voltage in a high-voltage transformer substation; the device consists of an iron core, a winding, a cover plate, a bolt, an oil tank, an oil level indicator, a pressure release valve, an overheat protection device, a hydrogen detection alarm device and the like; the main working principle of the oil immersed transformer is to convert high-voltage current or voltage into smaller current or voltage for measurement or protection. Specifically, a current is passed through the windings, creating a magnetic flux that is drawn by the core, and inducing an electrical potential in the other winding. Oil-immersed transformers typically measure current and voltage using a secondary winding, with a linear transformation ratio between the secondary and primary windings to determine an actual measurement.
With the development of modern power system technology, current transformers are used more frequently; after the current transformer is used for a long time, the internal insulating oil can be decomposed to generate gas, so that the internal pressure of the current transformer is increased, and the upper cover of the expander of the current transformer is jacked up, so that an alarm device is needed to remind the internal pressure of the current transformer of change.
Disclosure of Invention
In view of the above, the present invention provides a digital abnormality alarm system for a current transformer for a transformer substation, so as to solve the above-mentioned problems.
The invention is realized in the following way:
the invention provides a digital abnormality alarm system of a current transformer for a transformer substation, which comprises a light source arranged on the inner top wall of an upper cover of an expander and in the center, wherein the light source emits light rays perpendicular to the upper cover; around the light source, a plurality of brightness sensor matrixes are arranged in a surrounding mode;
a reflecting device which is horizontally arranged is arranged right below the light source;
the reflecting device comprises a balancing weight which is positioned under the light source and connected with the edge of the upper cover through a spring, a circular reflecting mirror is arranged at the center of the balancing weight, circular shading films with different shading rates are sequentially attached to the center of the reflecting mirror outwards, and the shading rate of the shading films is increased along with the increase of the outer diameter;
and the processor is connected with the brightness sensor matrix and is used for directly outputting an alarm after the reflected light of the circular shading film at any position is injected into the brightness sensor matrix in the inclined state of the upper cover, or carrying out an alarm after the inclination angle of the upper cover is confirmed by comparing the reflected light with a threshold value after the brightness detected by the brightness sensor matrix.
Preferably, the materials with different shading rates of the circular ring are reflection films of metal plating layers; the difference between the shading rates of adjacent shading films is more than 5%;
the detection range of the brightness sensor matrix comprises a plurality of brightness data, and the brightness data ranges are in one-to-one correspondence with the plurality of annular shading films and the inclination angles of the upper cover.
Preferably, the determining the inclination angle of the upper cover includes determining the brightness data detected by the brightness sensor matrix, and determining the inclination angle of the upper cover according to the one-to-one correspondence.
Preferably, the balancing weight is plate-mounted, and is fixedly connected with the edge of the upper cover through two ends of the spring and is parallel to the upper cover.
Preferably, the light source is a laser emitter.
Preferably, the processor stores a program of instructions, the program of instructions being operative to perform the steps of:
collecting brightness data measured by the brightness sensor matrix; the confirming the inclination angle of the upper cover includes:
and calculating the brightness data and the inclination angle comparison model input to the trained upper cover, and outputting the inclination angle of the upper cover.
Preferably, the construction steps of the trained inclination angle comparison model of the upper cover are as follows:
the angle of the upper cover is manually inclined by a user, and the brightness data of the brightness sensor matrix and the inclination angle of the upper cover are measured and collected by adopting an angle ruler to serve as a training data set;
and establishing a neural network model, taking the brightness data of the brightness sensor matrix as input data and the inclination angle of the upper cover as output data, and inputting a training data set into the neural network model for training to obtain a trained inclination angle comparison model of the upper cover.
Preferably, the device further comprises an alarm for giving an alarm when the processor detects that the inclination angle of the upper cover exceeds a threshold value.
Preferably, the threshold value of the inclination angle of the upper cover is 30 degrees.
Compared with the prior art, the digital abnormality alarm system for the current transformer for the transformer substation has the beneficial effects that: by arranging the reflecting device, light rays emitted by the light source can be reflected, and the brightness of the reflected light rays can be changed by arranging the annular shading films with different shading rates, so that different brightness changes can be detected by the brightness sensor matrix, and the inclination angle of the upper cover of the current expander is calculated; through setting up the alarm, can in time send out the alarm when detecting the inclination of upper cover too big, prevent to take place the incident.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a current transformer expander anomaly alarm system for a substation;
FIG. 2 is a schematic diagram of a structure of a luminance sensor matrix;
FIG. 3 is a schematic diagram of a reflective device;
FIG. 4 is a schematic view of a path of light projected by a light source in an initial state of the upper cover;
FIG. 5 is a schematic view of a path of light projected by a light source in a state where the upper cover is tilted;
in the drawings, the list of components represented by the various numbers is as follows:
10. a current transformer; 11. an upper cover; 12. a light source; 13. a luminance sensor matrix; 14. a reflecting device; 15. balancing weight; 16. a reflecting mirror.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
As shown in fig. 1 and 2, the embodiment of the digital abnormality alarm system of the current transformer expander for a transformer substation provided by the invention includes a light source 12 fixedly connected to the inner top wall of an upper cover 11 in the center position, wherein the light source 12 uses a laser emitter and projects light in a circular shape, the diameter of the light is 2-6 mm, and the light source 12 emits light perpendicular to the upper cover; around the light source 12, a plurality of luminance sensor matrices 13 are arranged in a surrounding manner; the brightness sensor matrix 13 is arranged in a fan shape and surrounds the periphery of the light source 12 through an annular array, receives light rays projected by the light source 12 and emitted by the reflecting device 14, detects brightness data of the reflected light rays, and transmits the brightness data of the reflected light rays to the processor.
It should be noted that the luminance sensor matrix is a photosensor arranged in an array, and can be used to measure the luminance of light. Compared with a traditional single brightness sensor, the brightness sensor matrix can simultaneously provide brightness data of a plurality of measurement points, so that the measurement time is effectively shortened, and the measurement accuracy is improved.
Directly below the light source 12, there is a horizontally placed reflecting device 14; the light projected by the light source 12 is located at the center of the reflecting device 14 when it is in a horizontal state.
The reflecting device 14 comprises a balancing weight 15 positioned right below the light source 12, the balancing weight 15 is connected with the edge of the upper cover 11 through a spring, a circular reflecting mirror 16 is arranged at the center of the balancing weight 15, circular shading films with different shading rates are sequentially attached to the center of the reflecting mirror 16 outwards, and the shading rate of the shading films is increased along with the increase of the outer diameter;
and the processor is connected with the brightness sensor matrix 13 and is used for directly outputting an alarm signal or confirming the inclination angle of the upper cover 11 according to the comparison of the inclination angle and a threshold value after the reflected light of the annular shading film at any position is injected into the brightness sensor matrix 13, and outputting a corresponding alarm according to the brightness detected by the brightness sensor matrix 13.
In the above technical solution, the materials with different shading rates of the ring are reflective films of metal plating, and the reflective films play a role in shading, and can be also called shading films; the difference value of the shading rates of the adjacent shading films is more than 5%, so that the larger brightness deviation can be correspondingly detected by the brightness sensor matrix;
as a first example of the metal plating layer, an aluminum plating layer was used, the light shielding rate of the aluminum plating film of 50 μm thickness was 95%, and the light shielding rate of the aluminum plating film was reduced by 5% every half of the thickness of the aluminum plating film.
As a second example of the metal plating layer, a silver plating layer was used, the light shielding rate of which was 97% at a thickness of 50 nm, and the light shielding rate was reduced by 2% every half of the thickness of the silver plating layer.
It should be noted that, other metal plating layers can adjust the thickness of the plating layer according to their own material properties to meet the requirement of the difference between the shading rates of adjacent shading films, and the principle is that the change of the shading rate is realized by changing the ratio between the reflectivity of light and the transmissivity of light by changing the thickness of the metal plating layer.
It should be noted that, when the air pressure inside the current transformer 10 increases, the upper cover 11 is tilted after being jacked up, the reflecting device 14 is displaced relative to the center of the upper cover 11 under the action of gravity, the light of the light source 12 cannot be vertically projected onto the reflecting mirror 16, the light of the light source 12 is deflected, the light is projected onto a certain annular shading film on the reflecting mirror 16, the light is transmitted onto the brightness sensor matrix 13 after being changed in brightness by the shading film, each circle of shading film corresponds to one piece of reflected brightness data, the brightness data is transmitted to the processor, the processor inputs the brightness data into a trained comparison model of the inclination angle of the upper cover 11, the comparison model can adopt a common training model, the brightness data and the angle data are measured through the inclination of the upper cover at any position of the circumference, the training model is carried until the brightness data are given, and the corresponding inclination angle can be obtained, so that the inclination angle of the upper cover 11 is obtained.
For example: in the model training process, an angle gauge may be used, and the inclination angle of the upper cover 11 is measured after the upper cover 11 is inclined, and the numerical value of the current brightness sensor matrix 13 is recorded. As the training basis for the above model.
The detection range of the luminance sensor matrix 13 includes a plurality of luminance data, a data range to which the plurality of luminance data are fitted, a position of the light shielding film where the laser light is incident on any one of the circular rings, and a range section of each parameter of the correspondence relationship with the inclination angle of the upper cover 11 can be established in advance.
Further, in the above-described aspect, confirming the tilt angle of the upper cover 11 includes confirming the brightness data detected by the brightness sensor matrix 13, and confirming the tilt angle of the upper cover according to the range of the one-to-one correspondence relationship. The confirmation process avoids the operation time, and can directly obtain the current inclination state so as to determine whether the accident state exists.
As shown in fig. 3, in the above technical solution, the balancing weight 15 includes two symmetrical metal half rings, and is connected by screws, the balancing weight 15 is placed at the center of the corresponding upper cover 11, two sides are hooked by springs, the springs are fixed at the inner side of the upper cover 11 and fastened, so that the balancing weight 15 and the springs are approximately at the same level, and two ends of the springs are respectively fixed at the edges of the upper cover 11.
When the air pressure in the current transformer 10 increases, the upper cover 11 of the expander is lifted up and then tilted, the center of gravity of the arrangement block 15 is shifted, the light projected from the light source 12 falls on the annular light shielding film at a certain position around the center on the reflecting mirror 16, and the light is reflected to the luminance sensor matrix 12 through a certain annular light shielding film.
In the above technical solution, the luminance sensor matrix 12 is connected to a processor, and an instruction program is stored in the processor, and the instruction program is executed to perform the following steps:
collecting brightness data measured by the brightness sensor matrix 13; in a normal state, the balancing weight 15 is parallel to the upper cover 11, light reflected by the laser is received by the brightness sensor matrix 15 around the light source 12, and is reflected to the center of the shading film, and almost no attenuation is generated to reflect all the light, so that the loss is small. The difference between the measured luminance data and the luminance data of the emitted laser light is small as a loss. It is considered that no inclination occurs.
The processor continuously and periodically detects brightness data;
the detected brightness data is calculated by comparing with the inclination angle comparison model input to the trained upper cover 11, and the inclination angle of the upper cover 11 is output.
Until the expander has developed a sudden pressure change, the upper cover 11 is lifted, producing an angular tilt.
The processor can output an alarm according to the detected inclination angle; or judging that the inclination angle is within a certain angle range, and outputting corresponding mild (within 10 degrees), moderate (10-30 degrees) and severe (30-60 degrees) alarms.
Further, in the above technical solution, the construction steps of the trained inclination angle comparison model of the upper cover 11 are as follows:
the relation between the brightness data of the brightness sensor matrix 13 and the inclination angle of the upper cover 11 is measured through manual collection by a user and is used as a training data set;
and establishing a neural network model, taking the brightness data of the brightness sensor matrix 13 as input data and the inclination angle of the upper cover 11 as output data, and inputting a training data set into the neural network model for training to obtain a trained inclination angle comparison model of the upper cover 11.
In the above technical solution, the device further comprises an alarm, and the alarm is used for sending out an alarm when detecting that the inclination angle of the upper cover 11 exceeds a threshold value. The alarm can be connected with the processor, and the alarm adopts an audible and visual alarm or is arranged in a room with a person on duty such as a monitoring room for a long time to discover the faults of the current transformer 10 in time.
Further, in the above-described embodiment, the threshold value of the inclination angle of the upper cover 11 may be fixed at 30 degrees. The processor judges that the inclined angle is larger than the threshold value by 30 degrees, namely, the alarm is given.
Preferably, in one embodiment, the processor may also use the first installation, the undetected signal as a normal state, for example, when the upper cover 11 of the current transformer 10 is slightly tilted in use, an annular blank area needs to be left between the brightness sensor matrix 13 and the light source 12, and when the tilt angle of the upper cover 11 is greater than 10 degrees, the light reflected by the light source 12 through the reflecting mirror 16 can be detected by the brightness sensor matrix 13.
In this case, the detection flow of the present invention is:
as shown in fig. 4, the arrow direction in the figure is the path of light projected by the light source 12;
in the initial state, the upper cover 11 is in a horizontal state, the balancing weights 15 are positioned under the light source 12 under the fixing action of the metal semi-rings, the balancing weights 15 are parallel to each other, the light projected by the light source 12 is vertically downward, the reflecting mirror 16 on the balancing weights 15 is positioned at the center, the light is vertically reflected, the light cannot be reflected to the brightness sensor matrix 13, at the moment, the brightness sensor matrix 13 does not detect the brightness of the light, and the brightness data is zero.
During the continuous detection of the processor, the upper cover 11 of the expander is inclined by the abrupt internal pressure change. At this time, as shown in fig. 5, the path of the light projected by the light source 12 is changed in the direction of the arrow;
when the inside of the current transformer 10 is decomposed to generate gas due to insulating oil, the air pressure in the current transformer 10 is increased, the upper cover 11 is jacked up, the upper cover 11 is inclined, the balancing weight 15 is deviated from the relative position of the light source 12 under the action of gravity, the light of the light source 12 cannot vertically downwards project to the center position of the reflecting mirror 16 of the balancing weight 15, the light is projected on one of a plurality of annular shading films, the light forms a certain included angle with the reflecting mirror 16 and can be projected on a certain point of the annular shading film around the reflecting mirror 16, light loss can occur after the light passes through the annular shading film, and the brightness of the light reflected by the reflecting mirror 16 can be reduced; if the tilt angle of the upper cover 11 is larger, the position of the light beam of the light source 12 projected onto the annular light shielding film of the reflecting mirror 16 is farther from the center of the reflecting mirror 16, the light shielding rate of the annular light shielding film is larger, the light loss is larger, the brightness of the light beam reflected by the reflecting mirror 16 is lower, and the brightness data detected by the brightness sensor matrix 13 is smaller. The brightness sensor matrix 13 transmits the detected brightness data to the processor, the processor inputs the brightness data into the inclination angle comparison model of the upper cover 11, or matches according to the one-to-one correspondence relationship in the above embodiment, outputs the inclination angle of the upper cover 11 corresponding to the brightness data, compares the inclination angle with a threshold value, and prompts a worker to overhaul the current transformer 10 according to the comparison result or directly starts an alarm, and if the inclination angle threshold value is not exceeded, the current transformer is in a normal running state.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (8)
1. The digital abnormality alarm system of the current transformer for the transformer substation is characterized by comprising a light source arranged on the inner top wall of an upper cover of an expander and in the center, wherein the light source emits light rays perpendicular to the upper cover; around the light source, a plurality of brightness sensor matrixes are arranged in a surrounding mode;
a reflecting device which is horizontally arranged is arranged right below the light source;
the reflecting device comprises a balancing weight which is positioned under the light source and connected with the edge of the upper cover through a spring, a circular reflecting mirror is arranged at the center of the balancing weight, circular shading films with different shading rates are sequentially attached to the center of the reflecting mirror outwards, and the shading rate of the shading films is increased along with the increase of the outer diameter;
the processor is connected with the brightness sensor matrix and is used for directly outputting an alarm after the reflected light of the circular shading film at any position is injected into the brightness sensor matrix in the inclined state of the upper cover, or carrying out an alarm after the inclination angle of the upper cover is confirmed by the brightness detected by the brightness sensor matrix, wherein the materials with different shading rates of the circular ring are the reflecting films of the metal plating layers; the difference between the shading rates of adjacent shading films is more than 5%;
the detection range of the brightness sensor matrix comprises a plurality of brightness data, and the brightness data ranges are in one-to-one correspondence with the plurality of annular shading films and the inclination angles of the upper cover.
2. The digital abnormality warning system for a current transformer for a transformer substation according to claim 1, wherein said confirming the inclination angle of the upper cover includes confirming the brightness data detected by the brightness sensor matrix, and confirming the inclination angle of the upper cover according to the one-to-one correspondence.
3. The digital abnormality alarm system for a current transformer for a transformer substation according to claim 1, wherein the balancing weight is mounted on a board, and is fixedly connected with the edge of the upper cover through two ends of the spring, and is parallel to the upper cover.
4. The digital abnormality alarm system for a current transformer for a transformer substation according to claim 1, wherein the light source is a laser emitter.
5. The digital abnormality warning system of a current transformer for a transformer substation according to claim 1, wherein said processor has stored therein a program of instructions operative to perform the steps of:
collecting brightness data measured by the brightness sensor matrix; the confirming the inclination angle of the upper cover includes:
and calculating the brightness data and the inclination angle comparison model input to the trained upper cover, and outputting the inclination angle of the upper cover.
6. The digital abnormality alarm system for a current transformer for a transformer substation according to claim 5, wherein the construction steps of the trained inclination angle comparison model of the upper cover are as follows:
the angle of the upper cover is manually inclined by a user, and the brightness data of the brightness sensor matrix and the inclination angle of the upper cover are measured and collected by adopting an angle ruler to serve as a training data set;
and establishing a neural network model, taking the brightness data of the brightness sensor matrix as input data and the inclination angle of the upper cover as output data, and inputting a training data set into the neural network model for training to obtain a trained inclination angle comparison model of the upper cover.
7. The digital anomaly alarm system for a current transformer for a transformer substation according to claim 6, further comprising an alarm for issuing an alarm when the processor detects that the inclination angle of the upper cover exceeds a threshold value.
8. The digital abnormality warning system for a current transformer for a transformer substation according to claim 7, wherein the threshold value of the inclination angle of the upper cover is 30 degrees.
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| CN202310573660.8A CN116718131B (en) | 2023-05-19 | 2023-05-19 | Digital abnormality alarm system of current transformer for transformer substation |
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| CN202310573660.8A CN116718131B (en) | 2023-05-19 | 2023-05-19 | Digital abnormality alarm system of current transformer for transformer substation |
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| CN116718131B true CN116718131B (en) | 2024-03-19 |
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