CN110174223B - System and method for detecting oil leakage area of transformer body - Google Patents
System and method for detecting oil leakage area of transformer body Download PDFInfo
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- CN110174223B CN110174223B CN201910594386.6A CN201910594386A CN110174223B CN 110174223 B CN110174223 B CN 110174223B CN 201910594386 A CN201910594386 A CN 201910594386A CN 110174223 B CN110174223 B CN 110174223B
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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
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
- G01B11/285—Measuring arrangements characterised by the use of optical techniques for measuring areas using photoelectric detection means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
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- General Physics & Mathematics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The application discloses transformer body oil leakage detection system and method, its characterized in that includes: a monitored transformer; a transformer oil leakage area detector; a display screen; a power outlet; a communication and USB port; operating a key; an operation interface; an oil-leaking region; a single-point fluorescence excitation source; an annular fluorescence excitation source; rotating the sleeve; a fluorescence detector; a high precision motion controller; a main control board; a stepper motor. The invention realizes the quick judgment of whether the transformer body leaks oil and the calculation of the oil leakage area. The invention adopts the principle that the ultraviolet light beam excites the oil surface fluorescence imaging after irradiating the oil leakage area of the transformer body, and quickly, accurately and real-timely detects the oil leakage insulation problem of the equipment.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a system and a method for detecting the oil leakage area of a transformer body.
Background
The transformer is an important device for energy distribution in a power grid, and directly influences the stable operation and the power utilization reliability of the power grid. Oil leakage of the transformer not only causes damage to an internal insulation system and reduces the insulation strength of the transformer, but also may cause power failure of the transformer. The leakage of the transformer oil is timely found by applying an efficient and safe means, the high quality of the operation and maintenance of equipment is ensured, and the method is a hot proposition concerned in the electrical field.
However, under the requirements of complex electromagnetic environments in transformer substations, heavy pollution and other extreme environments, no relevant report is found in the specialized portable fluorescence imaging equipment for detecting the leaked oil, which realizes the intelligent leaked oil identification.
Disclosure of Invention
The invention aims to provide a system and a method for detecting the oil leakage area of a transformer body, which can realize the quick judgment of whether the transformer body leaks oil and the calculation of the oil leakage area. The invention adopts the principle that the ultraviolet light beam excites the oil surface fluorescence imaging after irradiating the oil leakage area of the transformer body, thereby rapidly, accurately and real-timely detecting the oil leakage insulation problem of the equipment;
the application provides a system for detecting the oil leakage area of a transformer body, which comprises a detected transformer and a transformer oil leakage area detector; an oil leakage area is arranged on one side of the detected transformer; the transformer oil leakage area detector is provided with a display screen, an operation key, an operation interface and a high-precision movement controller; wherein the content of the first and second substances,
the high-precision movement controller is arranged on the surface of the transformer oil leakage area detector; one side surface of the high-precision mobile controller is sleeved and connected with a single-point fluorescence excitation source, an annular fluorescence excitation source and a rotating sleeve; the rotating sleeve is nested outside the annular fluorescence excitation source, and the annular fluorescence excitation source is nested outside the single-point fluorescence excitation source; a fluorescence detector is arranged between the annular fluorescence excitation source and the single-point fluorescence excitation source; the single-point fluorescence excitation source and the annular fluorescence excitation source are in rotary connection; a main control board and a stepping motor are arranged in the transformer oil leakage area detector; the stepping motor is electrically connected with the high-precision movement controller; the direction of the single-point fluorescence excitation source points to the oil leakage area;
the display screen, the operation keys, the operation interface, the high-precision mobile controller, the single-point fluorescence excitation source, the annular fluorescence excitation source and the fluorescence detector are electrically connected to the main control board.
Optionally, the transformer oil leakage area detector is further provided with a power socket, a communication port and a USB port.
Optionally, the main control board is integrated with an arithmetic circuit, an auxiliary power circuit, a driving circuit and a protection circuit;
the operation circuit is used for executing a calculation process related to oil leakage detection to obtain a calculation result;
the auxiliary power circuit is used for supplying power to the transformer oil leakage area detector;
the driving circuit is used for driving the stepping motor;
the protection circuit is used for cutting off the circuit when an abnormal condition occurs.
The application also provides a method for detecting the oil leakage area of the transformer body, which comprises the following steps:
ultraviolet rays emitted by the annular fluorescence excitation source irradiate the transformer body;
the method comprises the steps that a fluorescence detector obtains a fluorescence signal of a transformer body and judges whether the transformer body has an oil leakage area or not;
after an oil leakage area is detected, switching to a single-point fluorescence excitation source to emit ultraviolet rays to irradiate the transformer body;
the main control board accurately identifies the outline of the oil leakage area according to the change of the fluorescence signal in the scanning period before and after the acquisition of the fluorescence detector;
correspondingly converting the edge fluorescent points of the oil leakage area detected by the single-point fluorescent detector into coordinates by the main control board to generate an oil leakage image;
calculating the distance between the transformer oil leakage area detector and the oil leakage area according to the emission time of the single-point fluorescence excitation source, the receiving time of the fluorescence detector and the amplitude angle delta of the high-precision mobile controller;
the area (length and width) of the oil leakage image is set as a reference area, and the area of the oil leakage image is calculated by setting the lower left point in the reference area as a reference point.
Optionally, the transformer body is irradiated by ultraviolet rays emitted by the single-point fluorescence excitation source in a manner of reciprocating up and down and scanning an oil leakage area from left to right.
Optionally, the fluorescence detector moves synchronously with the single-point fluorescence excitation source.
Optionally, after the oil leakage image is generated, the method further includes:
comparing and correcting the oil leakage area and the oil leakage image, and filtering invalid characteristic points;
re-extracting the feature points of the invalid region to generate a fitting graph;
and comparing the oil leakage image again until the fitted graph and the oil leakage image are basically consistent.
The invention combines optical detection and graph calculation, realizes the nondestructive diagnosis of the oil leakage state of the transformer body, reflects the oil leakage insulation problem of equipment in real time, and realizes the early warning of the transformer fault; the oil leakage insulation problem is monitored rapidly, accurately and in real time, and the operation and maintenance level of equipment is improved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a system for detecting an oil leakage area of a transformer body according to the present application;
FIG. 2 is a partial schematic view of a transformer leakage oil area detector in the transformer body leakage oil area detection system according to the present application;
FIG. 3 is a flowchart illustrating a method for detecting an oil leakage area of a transformer body according to the present application;
FIG. 4 is a schematic view of a corner of a high-precision motion controller;
wherein, 1, a detected transformer; 2. a transformer oil leakage area detector; 3. a display screen; 4. a power outlet; 5. a communication and USB port; 6. operating a key; 7. an operation interface; 8. an oil-leaking region; 9. a single-point fluorescence excitation source; 10. an annular fluorescence excitation source; 11. rotating the sleeve; 12. a fluorescence detector; 13. a high precision motion controller; 14. a main control board; 15. a stepper motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.
Referring to fig. 1, a schematic structural diagram of a system for detecting an oil leakage area of a transformer body according to the present application is shown;
as can be seen from fig. 1, the embodiment of the present application provides a system for detecting an oil leakage area of a transformer body, which includes a detected transformer 1 and a transformer oil leakage area detector 2; an oil leakage area 8 is arranged on one side of the detected transformer 1; the transformer oil leakage area detector 2 is provided with a display screen 3, an operation key 6, an operation interface 7 and a high-precision movement controller 13;
in this embodiment, the transformer leakage oil area detector 2 is used to perform operation processes such as detection and calculation of the leakage oil area on the detected transformer 1, and specifically, the display screen 3 is used to display the detection result; the operation key 6 is matched with the operation interface 7 for use and is used for inputting various instructions by an operator; and the high-precision movement controller 13 adjusts the directions of various devices for emitting fluorescence and receiving fluorescence signals, the adjustable devices including a fluorescence excitation source, a fluorescence detector, and the like.
Referring to fig. 2, a partial schematic view of a detector for detecting an oil leakage area of a transformer in the system for detecting an oil leakage area of a transformer body according to the present application is shown;
as can be seen from fig. 2, the high-precision motion controller 13 is disposed on the surface of the transformer oil leakage area detector 2; a single-point fluorescence excitation source 9, an annular fluorescence excitation source 10 and a rotating sleeve 11 are sleeved and connected on one side surface of the high-precision mobile controller 13, and the three parts are concentrically nested; the rotating sleeve 11 is nested outside the annular fluorescence excitation source 10, and the annular fluorescence excitation source 10 is nested outside the single-point fluorescence excitation source 9; the rotating sleeve 11 is used for protecting a fluorescence excitation source and a fluorescence detector; when the initial position of the fluorescence excitation source is adjusted, the effect of manual rapid adjustment can be achieved; a fluorescence detector 12 is arranged between the annular fluorescence excitation source 10 and the single-point fluorescence excitation source 9; the single-point fluorescence excitation source 9 is rotationally connected with the annular fluorescence excitation source 10; a main control board 14 and a stepping motor 15 are arranged inside the transformer oil leakage area detector 2; the stepping motor 15 is electrically connected with the high-precision motion controller 13; the direction of the single-point fluorescence excitation source 9 points to the oil leakage area 8;
the display screen 3, the operation keys 6, the operation interface 7, the high-precision mobile controller 13, the single-point fluorescence excitation source 9, the annular fluorescence excitation source 10 and the fluorescence detector 12 are all electrically connected to the main control board 14; in this embodiment, the main control board 14 is used to complete the control of each component and the processes of data acquisition, calculation, judgment, and the like, and is substantially formed by integrating hardware of each functional circuit, specifically, in a feasible embodiment, the main control board 14 is integrated with an arithmetic circuit, an auxiliary power circuit, a driving circuit, and a protection circuit;
the operation circuit is used for executing a calculation process related to oil leakage detection to obtain a calculation result; the calculation process may include a digital calculation process and a logic calculation process, and may be specifically implemented by corresponding software, which is not limited herein.
The auxiliary power circuit is used for supplying power to the transformer oil leakage area detector 2;
the driving circuit is used for driving the stepping motor 15;
the protection circuit is used for cutting off the circuit when an abnormal condition occurs; the abnormal conditions comprise the conditions of overvoltage, undervoltage, electric leakage and the like;
optionally, as shown in fig. 1, in another possible embodiment, the transformer leakage oil area detector 2 is further provided with a power socket 4 and a communication and USB port 5; the power socket 4 can be powered by an external power supply, so that the continuous use time of the equipment is prolonged, and the communication and USB port 5 can lead out data stored in the equipment for comprehensive research, record or other purposes.
The use of the system provided by the present application can be illustrated by fig. 3;
referring to fig. 3, it is a flowchart of a method for detecting an oil leakage area of a transformer body according to the present application;
as can be seen from fig. 3, the present application further provides a method for detecting an oil leakage area of a transformer body based on the system, where the method includes:
s1: ultraviolet rays emitted by the annular fluorescence excitation source irradiate the transformer body;
s2: the method comprises the steps that a fluorescence detector obtains a fluorescence signal of a transformer body and judges whether the transformer body has an oil leakage area or not;
in step S2, if the fluorescence detector does not acquire a fluorescence signal from the measured transformer body, it is determined that the transformer body does not have an oil leakage phenomenon; if the fluorescence signal is obtained, judging that an oil leakage area exists, and continuing the following steps;
s3: after an oil leakage area is detected, switching to a single-point fluorescence excitation source to emit ultraviolet rays to irradiate the transformer body;
s4: the main control board accurately identifies the outline of the oil leakage area according to the change of the fluorescence signal in the scanning period before and after the acquisition of the fluorescence detector; in this step, according to the need of detection, the operation is performed through the operation keys and the operation interface, the scanning step length and period of the fluorescence excitation source are set, then the area (length × width) of the object (oil leakage area) is scanned, and at the same time, the high-precision mobile controller is adjusted, so that the ultraviolet light emitted by the annular fluorescence excitation source irradiates the leftmost lower corner of the tested transformer body, and the point is used as the leftmost lower point of the area of the scanned object (oil leakage area), that is, the base standard point of the coordinates is set.
In step S4, the fluorescent images at different positions can also be obtained by manually rotating the rotating sleeve carrying the single-point fluorescence excitation source and the annular fluorescence excitation source to adjust the orientation of the fluorescence excitation source.
Further, in step S4, the transformer body is irradiated by the ultraviolet light emitted by the single-point fluorescence excitation source in a manner of scanning the oil leakage region from left to right back and forth from top to bottom, so as to ensure that the scanning process is not omitted and the obtained image is more accurate;
in the embodiment, the fluorescence detector moves synchronously along with the single-point fluorescence excitation source, so that the emitted ultraviolet rays can be rapidly acquired by the fluorescence detector while generating fluorescence, and the instantaneity of image generation is ensured.
S5: correspondingly converting the edge fluorescent points of the oil leakage area detected by the single-point fluorescent detector into coordinates by the main control board to generate an oil leakage image;
further, after step S5, the method further includes: comparing and correcting the oil leakage area and the oil leakage image, and filtering invalid characteristic points; re-extracting the feature points of the invalid region to generate a fitting graph; comparing the oil leakage image again until the fitting graph and the oil leakage image are basically consistent; thus, the finally obtained oil leakage image is more accurate.
The selection mode of the oil leakage edge contour related characteristic points is as follows: the single beam of ultraviolet light is scanned back and forth in a mode of repeated up and down and from left to right, and the fluorescence detector simultaneously induces fluorescence signals. If the fluorescence signal appears or disappears in the front and back scanning periods of the fluorescence detector, the scanning point is a special point of the oil leakage outline, namely the fluorescence detector detects no fluorescence signal (with fluorescence signal) in the previous scanning period and has a fluorescence signal (without fluorescence signal) in the next scanning period, and the scanning point is a characteristic point related to the oil leakage edge outline.
S6: calculating the distance between the transformer oil leakage area detector and the oil leakage area according to the emission time of the single-point fluorescence excitation source, the receiving time of the fluorescence detector and the amplitude angle delta of the high-precision mobile controller;
specifically, the calculation formula is as follows:
the time for the single-point fluorescence excitation source to emit ultraviolet light is t1, the time for the fluorescence detector to receive fluorescence is t2, the known propagation speed of light in air is v, and the distance d between the detector for the oil leakage area of the transformer body and the oil leakage area is cos delta (t2-t1) v/2.
Wherein the swath angle δ may be determined as shown in FIG. 4;
FIG. 4 is a schematic diagram of the corner of the high-precision mobile controller;
as can be seen from fig. 4, the argument δ is the angle between the pointing direction of the fluorescence excitation source and the horizontal direction, and the angle can be adjusted by the high-precision motion controller to obtain a specific value, i.e. can be used to calculate the above-mentioned distance value.
S7: the area (length and width) of the oil leakage image is set as a reference area, and the area of the oil leakage image is calculated by setting the lower left point in the reference area as a reference point.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. The system for detecting the oil leakage area of the transformer body is characterized by comprising a detected transformer (1) and a transformer oil leakage area detector (2); an oil leakage area (8) is arranged on one side of the detected transformer (1); the transformer oil leakage area detector (2) is provided with a display screen (3), an operation key (6), an operation interface (7) and a high-precision mobile controller (13); wherein the content of the first and second substances,
the high-precision movement controller (13) is arranged on the surface of the transformer oil leakage area detector (2); one side surface of the high-precision mobile controller (13) is sleeved and connected with a single-point fluorescence excitation source (9), an annular fluorescence excitation source (10) and a rotating sleeve (11); the rotating sleeve (11) is nested outside the annular fluorescence excitation source (10), and the annular fluorescence excitation source (10) is nested outside the single-point fluorescence excitation source (9); a fluorescence detector (12) is arranged between the annular fluorescence excitation source (10) and the single-point fluorescence excitation source (9); the single-point fluorescence excitation source (9) is rotationally connected with the annular fluorescence excitation source (10); a main control board (14) and a stepping motor (15) are arranged in the transformer oil leakage area detector (2); the stepping motor (15) is electrically connected with the high-precision motion controller (13); the direction of the single-point fluorescence excitation source (9) points to the oil leakage area (8);
the display screen (3), the operation keys (6), the operation interface (7), the high-precision mobile controller (13), the single-point fluorescence excitation source (9), the annular fluorescence excitation source (10) and the fluorescence detector (12) are electrically connected to the main control board (14).
2. The system for detecting the oil leakage area of the transformer body according to claim 1, wherein the detector (2) further comprises a power socket (4) and a communication and USB port (5).
3. The system for detecting the oil leakage area of the transformer body according to claim 1, wherein the main control board (14) is integrated with an arithmetic circuit, an auxiliary power circuit, a driving circuit and a protection circuit;
the operation circuit is used for executing a calculation process related to oil leakage detection to obtain a calculation result;
the auxiliary power circuit is used for supplying power to the transformer oil leakage area detector (2);
the drive circuit is used for driving the stepping motor (15);
the protection circuit is used for cutting off the circuit when an abnormal condition occurs.
4. The method for detecting the oil leakage area of the transformer body according to any one of claims 1 to 3, wherein the method comprises the following steps:
ultraviolet rays emitted by the annular fluorescence excitation source irradiate the transformer body;
the method comprises the steps that a fluorescence detector obtains a fluorescence signal of a transformer body and judges whether the transformer body has an oil leakage area or not;
after an oil leakage area is detected, switching to a single-point fluorescence excitation source to emit ultraviolet rays to irradiate the transformer body;
the main control board accurately identifies the outline of the oil leakage area according to the change of the fluorescence signal in the scanning period before and after the acquisition of the fluorescence detector;
the main control board correspondingly converts the edge fluorescent points of the oil leakage area detected by the fluorescent detector into coordinates to generate an oil leakage image;
calculating the distance between the transformer oil leakage area detector and the oil leakage area according to the emission time of the single-point fluorescence excitation source, the receiving time of the fluorescence detector and the amplitude angle delta of the high-precision mobile controller;
the area of the oil leakage image is calculated by setting the area of the scanning object as a reference area and setting the lower left point in the reference area as a reference point.
5. The method according to claim 4, wherein the step of irradiating the transformer body with the ultraviolet light emitted from the single-point fluorescence excitation source is performed by scanning an oil leakage region from left to right while reciprocating up and down.
6. The detection method according to claim 4, wherein the fluorescence detector moves synchronously with the single-point fluorescence excitation source.
7. The detection method according to claim 4, wherein after the oil leakage image is generated, the method further comprises:
comparing and correcting the oil leakage area and the oil leakage image, and filtering invalid characteristic points;
re-extracting the feature points of the invalid region to generate a fitting graph;
and comparing the oil leakage image again until the fitted graph and the oil leakage image are basically consistent.
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| CN201910594386.6A CN110174223B (en) | 2019-07-03 | 2019-07-03 | System and method for detecting oil leakage area of transformer body |
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| CN111126196A (en) * | 2019-12-10 | 2020-05-08 | 安徽银河物联通信技术有限公司 | Equipment oil leakage detection method |
| CN113670407B (en) * | 2021-08-12 | 2023-05-26 | 陕西飞机工业有限责任公司 | Fuel oil level measuring method |
| CN115046697A (en) * | 2022-06-17 | 2022-09-13 | 西南交通大学 | Method for detecting seal front edge of hydraulic conduit joint |
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| JPS636432A (en) * | 1986-06-26 | 1988-01-12 | Toshiba Corp | Method and device for leak detection |
| JPH09304281A (en) * | 1996-05-09 | 1997-11-28 | Tokyo Electric Power Co Inc:The | Oil detector |
| JP2017207342A (en) * | 2016-05-17 | 2017-11-24 | シャープ株式会社 | Fluorescence detector |
| CN107588901A (en) * | 2017-07-31 | 2018-01-16 | 宁夏共享机床辅机有限公司 | The fluid tight detection means and system of a kind of seepage defect |
| CN108844689A (en) * | 2018-06-13 | 2018-11-20 | 张彦 | A kind of transformer oil leakage detection method |
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