CN113588330B - Oil extraction method for operating transformer - Google Patents
Oil extraction method for operating transformer Download PDFInfo
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- CN113588330B CN113588330B CN202110729037.8A CN202110729037A CN113588330B CN 113588330 B CN113588330 B CN 113588330B CN 202110729037 A CN202110729037 A CN 202110729037A CN 113588330 B CN113588330 B CN 113588330B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G06T5/90—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N2001/1031—Sampling from special places
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
Abstract
The invention relates to an oil extraction method for operating a transformer, which comprises the following steps: an oil taking step, namely connecting an oil taking device with an oil taking valve device arranged on the transformer, wherein the oil taking device comprises an oil taking mechanism, and oil in the transformer flows into the oil taking mechanism; the detection step, the oil extraction mechanism comprises a camera and an oil storage bottle, the camera is positioned at the bottom end of the oil storage bottle, the camera can rotate relative to the oil storage bottle, the camera is used for collecting gray image data of oil in the oil storage bottle and oil in the oil storage bottle, the oil extraction step is continued under the condition that the gray image data meets a preset threshold, the oil extraction is completed under the condition that the gray image data does not meet the preset threshold, and the oil extraction device is separated from the oil extraction valve device; by the arrangement, full automation of oil extraction is realized, and meanwhile, the safety of oil extraction is improved.
Description
Technical Field
The invention relates to the technical field of transformer detection, in particular to an oil extraction method for operating a transformer.
Background
Currently, transformers are substation infrastructure, and large transformers operating in the power grid are typically oil-immersed power transformers. Insulating oil in the transformer is used as a medium for insulating the inside of the transformer on one hand; on the other hand, the heat-dissipating device is used as a heat-dissipating medium to transfer the heat emitted by the iron core, the winding and the like of the transformer to the cooling device. Therefore, the insulating oil plays a vital role in ensuring the normal and safe operation of the transformer.
In the long-time operation of the transformer, under the comprehensive influence of physical and chemical factors such as illumination, temperature, oxygen, humidity, electric field intensity and the like in the natural world, the insulating oil mainly comprising hydrocarbon chains can be decomposed to generate mixed gas of hydrogen and low-molecular hydrocarbon (methane, ethylene, acetylene and ethane), and carbon monoxide and carbon dioxide can be decomposed from fiber insulating solid materials such as paper and the like in the transformer. When the mixed gas meets open fire or the temperature rises instantaneously to reach the minimum ignition point of the mixed gas, combustion and explosion can occur. In engineering practice, besides taking protective measures on the operating transformer oil to prevent the operating transformer oil from being aged prematurely, oil samples are periodically sampled for oiling tests to know the quality and performance of the operating insulating oil.
When the transformer is sampled, operation and maintenance personnel can perform uninterrupted operation, namely electrified oil extraction, so as not to influence the normal operation of the system. Although the design of the transformer considers the use of charged oil extraction and is provided with a safe oil extraction valve, as the capacity of the transformer is greatly improved compared with the past, the transformer can quickly burn gas when light gas acts, so that oil extraction personnel are dangerous, but oil extraction test is one of the important bases for accurately evaluating the internal faults of the transformer at present.
However, when oil is taken and sampled from the operation transformer by manpower, the transformer gas combustion possibly occurs, the damage to workers is caused, and the safety is low.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the oil extraction method for operating the transformer, which has the advantages of improving the safety of oil extraction and sampling and avoiding the damage to staff.
The above object of the present invention is achieved by the following technical solutions: an oil extraction method for operating a transformer, comprising the steps of:
the oil extraction step is that an oil extraction device is connected with an oil extraction valve device arranged on a transformer, the oil extraction device comprises an oil extraction mechanism, and oil in the transformer flows into the oil extraction mechanism;
the detection step, the oil extraction mechanism further comprises a camera and an oil storage bottle, the camera is positioned at the bottom end of the oil storage bottle, the camera can rotate relative to the oil storage bottle, the camera is used for collecting gray image data of oil in the oil storage bottle and the oil in the oil storage bottle, the oil extraction step is continued under the condition that the gray image data meets a preset threshold, the oil extraction is completed under the condition that the gray image data does not meet the preset threshold, and the oil extraction device is separated from the oil extraction valve device.
Preferably, the oil extraction method for operating the transformer provided by the invention further comprises the following steps before the oil extraction step: and acquiring image data by using the camera, and determining the position of the oil outlet pipe on the oil extraction valve device by the camera through identifying the image data.
Preferably, the oil extraction method for operating a transformer provided by the invention specifically includes the following steps: the oil extraction mechanism further comprises a laser, the laser is located on one side of the oil storage bottle, a light beam extending along the radial direction of the oil storage bottle is obtained by the aid of the laser, RGB three-channel image data of the light beam are collected by the camera, and gray image data of the light beam are obtained through calculation according to a weighted average method.
Preferably, the oil extraction method for the running transformer provided by the invention comprises the following steps of:
gray＝0.299×R+0.587×G+0.114×B
where gray is the gray pixel value for the desired location and R, G, B is the component pixel values for the three channels for the desired location.
Preferably, the preset threshold value comprises a preset gray value and a preset gray pixel duty ratio.
Preferably, in the oil extraction method for operating a transformer according to the present invention, when the predetermined gray value is smaller than 121 and the predetermined gray pixel ratio is greater than 60%, the oil extraction device continues to extract oil.
Preferably, the oil extraction method for operating the transformer provided by the invention specifically comprises the following steps: the oil extraction mechanism further comprises a joint and a connecting pipe, wherein one end of the connecting pipe is sleeved with the joint, and the other end of the connecting pipe is communicated with the oil storage bottle; the connector is connected with the oil taking valve device, the connecting pipe is communicated with the oil outlet pipe, and oil in the transformer flows into the oil storage bottle through the connecting pipe.
Preferably, the oil extraction method for operating a transformer provided by the present invention further includes, after the detecting step: and measuring the oil product of the oil liquid accommodated in the oil storage bottle by using the laser.
Preferably, the method for extracting oil from an operating transformer provided by the invention, wherein the method for measuring the oil product of the oil liquid contained in the oil storage bottle by using the laser specifically comprises the following steps: and acquiring the gray value of the light beam emitted by the laser by using the camera, and identifying the oil product in the oil liquid in the oil storage bottle through the gray value.
Preferably, in the oil extraction method for operating the transformer provided by the invention, the oil extraction mechanism further comprises a drain valve, wherein the drain valve is arranged on the outer side wall of the joint and is used for preventing oil in the transformer from leaking under the condition that the joint is damaged.
In summary, the beneficial technical effects of the invention are as follows: the oil extraction method for the operation transformer comprises the following steps: an oil taking step, namely connecting an oil taking device with an oil taking valve device arranged on the transformer, wherein the oil taking device comprises an oil taking mechanism, and oil in the transformer flows into the oil taking mechanism; the detection step, the oil extraction mechanism comprises a camera and an oil storage bottle, the camera is positioned at the bottom end of the oil storage bottle, the camera can rotate relative to the oil storage bottle, the camera is used for collecting gray image data of oil in the oil storage bottle and oil in the oil storage bottle, the oil extraction step is continued under the condition that the gray image data meet a preset threshold, and the oil extraction device is separated from the oil extraction valve device under the condition that the gray image data do not meet the preset threshold; by the arrangement, full automation of oil extraction is realized, and meanwhile, the safety of oil extraction is improved.
Drawings
Fig. 1 is a schematic flow chart of an oil extraction method for operating a transformer according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an overall structure of an oil extraction device for operating a transformer according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an oil extraction mechanism in an oil extraction device for operating a transformer and an oil extraction valve device in the transformer according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a second structure of an oil extraction mechanism in an oil extraction device for operating a transformer and an oil extraction valve device in the transformer according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a connection structure between an oil extraction mechanism in an oil extraction device for operating a transformer and an oil extraction valve device in the transformer according to an embodiment of the present invention.
Fig. 6 is a schematic diagram II of a connection between an oil extraction mechanism in an oil extraction device for operating a transformer and an oil extraction valve device in the transformer according to an embodiment of the present invention.
Fig. 7 is a schematic diagram III of a connection structure between an oil extraction mechanism in an oil extraction device for operating a transformer and an oil extraction valve device in the transformer according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of an oil extraction mechanism in an oil extraction device for operating a transformer and an oil extraction valve device in the transformer (oil stored in an oil storage bottle) according to an embodiment of the present invention.
Fig. 9 is a schematic diagram II (oil stored in an oil storage bottle) of an oil extraction mechanism in an oil extraction device for operating a transformer and an oil extraction valve device in the transformer according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of the relative positions of a laser and a camera in the oil extraction device for operating a transformer according to an embodiment of the present invention.
In the figure, 1, an oil taking device; 10. a moving trolley; 20. a connecting arm; 30. an oil taking mechanism; 301. a joint; 3011. a groove; 302. a connecting pipe; 303. an oil storage bottle; 304. a laser; 3041. a light pillar; 305. a camera; 2. an oil extraction valve device; 21. an oil outlet pipe; 22. a control assembly; 221. a housing; 2211. a mounting hole; 2212. round table holes; 2213. an operating flange; 222. installing a pipe; 2221. a control hole; 2222. a connecting flange; 2223. a stop flange; 223. an operating member; 224. a sphere; 23. a first elastic member; 24. a second elastic member; 25. a thread nipple; 26. and a seal.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the oil extraction method for operating a transformer disclosed by the invention comprises the following steps: the oil extraction step is that an oil extraction device 1 is connected with an oil extraction valve device 2 arranged on a transformer, the oil extraction device 1 comprises an oil extraction mechanism 30, and oil in the transformer flows into the oil extraction mechanism 30; oil in the transformer is deoiled and sampled through the oil extraction device 1, so that full-automatic oil extraction is realized, and the oil extraction safety is improved.
With continued reference to fig. 2, in this embodiment, in order to implement full automation, the oil extraction device 1 further includes a mobile cart 10 and a connecting arm 20, the connecting arm 20 is disposed at the top end of the mobile cart 10, one end of the connecting arm 20 is connected with the mobile cart 10, and the other end of the connecting arm 20 is connected with the oil extraction mechanism 30; on the one hand, the oil extraction mechanism 30 is driven to move to a designated position by the movement of the mobile trolley 10; on the other hand, the oil extraction mechanism 30 is driven to move to a designated height by the rotation of the connecting arm 20.
With continued reference to fig. 3 and 4, in the present embodiment, the oil extraction mechanism 30 includes a connector 301, a connecting pipe 302, and an oil storage bottle 303, one end of the connecting pipe 302 is sleeved with the connector 301, the other end of the connecting pipe 302 is communicated with the oil storage bottle 303, and the connector 301 is used for being connected with the oil extraction valve device 2.
In order to automatically determine the position of the oil 21 of the oil extraction device 1, the oil extraction mechanism 30 further includes a camera 305, the camera 305 is located at the bottom end of the oil storage bottle 303, the camera 305 can rotate relative to the oil storage bottle 303, during use, the camera 305 rotates to point to the direction along the central axis of the joint 301 and faces one side of the transformer, and when approaching the transformer, the camera 305 determines the position of the oil outlet pipe 21 on the oil extraction valve device 2 by identifying image data; by arranging the camera 305, the position of the oil outlet pipe 21 is fully automatically determined, and the convenience of the oil extraction device 1 is improved.
The outer peripheral wall of the joint 301 is provided with a groove 3011 matched with the oil extraction valve device 2, and a preset angle is clamped between the inner side wall of the groove 3011 and the horizontal plane, that is to say, the inner wall of the groove 3011 is an inclined surface.
The oil taking valve device 2 is arranged on the transformer, and the oil taking valve device 2 is used for controlling outflow of oil in the transformer. The oil extraction valve device 2 comprises an oil outlet pipe 21, a control assembly 22, a first elastic piece 23, a second elastic piece 24, a threaded nipple 25 and a sealing piece 26, wherein the control assembly 22 encloses into a containing channel, the oil outlet pipe 21 is inserted into the containing channel, the oil outlet pipe 21 can slide along the extending direction of the containing channel, one end of the first elastic piece 23 is abutted with the first end of the oil outlet pipe 21, and when the connector 301 is connected with the oil outlet pipe 21, the first elastic piece 23 is in a compressed state, and at the moment, the first elastic piece 23 provides restoring force for the oil outlet pipe 21. In order to avoid leakage of oil in the transformer through the oil outlet pipe 21, a first end of the oil outlet pipe 21 is in a closed package, an oil outlet hole is formed in an outer peripheral wall close to a second end of the oil outlet pipe 21, when the connector 301 is connected with the oil outlet pipe 21, the connecting pipe 302 is communicated with the oil outlet pipe 21, at the moment, the oil outlet hole is positioned in the threaded nipple 25, the first elastic piece 23 is in a compressed state, oil in the transformer flows into the oil outlet pipe 21 through the oil outlet hole, flows into the connecting pipe 302 through the oil outlet pipe 21, and flows into the oil storage bottle 303 through the connecting pipe 302; when the joint 301 is separated from the oil outlet pipe 21, the first elastic member 23 provides a restoring force for the oil outlet pipe 21, and at this time, the oil outlet is located outside the threaded nipple 25, thereby avoiding leakage of oil in the transformer.
Taking the orientation shown in fig. 3 as an example, the first end of the oil outlet pipe 21 is the right end, and the second end of the oil outlet pipe 21 is the left end.
Specifically, the control assembly 22 includes a housing 221, a mounting tube 222, an operating member 223, and at least one ball 224, where the housing 221 encloses a rotation channel, the housing 221 is sleeved on an outer peripheral wall of the mounting tube 222, and the housing 221 can slide along a central axis direction of the mounting tube 222. Taking the orientation shown in fig. 3 as an example, a mounting hole 2211 extending along the central axis direction of the housing 221 is formed at the right end of the housing 221, the mounting hole 2211 is communicated with the rotating channel, the central axis of the mounting hole 2211 is arranged in a line with the central axis of the rotating channel, and the diameter of the mounting hole 2211 is larger than that of the rotating channel.
The left end of casing 221 has seted up with joint 301 complex round platform hole 2212, and round platform hole 2212 extends along the axis direction of rotatory passageway, and round platform hole 2212 communicates with rotatory passageway, and the diameter of the major diameter end of round platform hole 2212 is greater than the diameter of rotatory passageway with rotatory passageway's the end that deviates from mounting hole 2211 is connected.
To facilitate sliding of the push housing 221 along the mounting tube 222, the left end of the housing 221 is provided with an operation flange 2213 extending radially outwardly of the rotation passage, an operation piece 223 is located on the left side of the operation flange 2213, and the operation piece 223 is used to drive the housing 221 to slide along the mounting tube 222.
Wherein, offer along the radial control hole 2221 that extends of installation pipe 222 on the periphery wall of installation pipe 222, control hole 2221 link up the periphery wall of installation pipe 222, and spheroid 224 is inserted and is established in control hole 2221, and spheroid 224 can slide along the axis direction of control hole 2221, and under initial condition, the outer wall of spheroid 224 supports on the inner wall of rotatory passageway.
Specifically, a connecting flange 2222 extending inwards along the radial direction of the installation pipe 222 is arranged inside the installation pipe 222, an internal thread matched with the thread nipple is arranged inside one end of the installation pipe 222 facing the transformer, one end of the thread nipple 25 is in threaded connection with the installation pipe 222, and the other end of the thread nipple 25 is communicated with an oil tank in the transformer. A seal 26 is provided between the side of the connection flange 2222 facing the transformer and the threaded nipple 25, and by providing the seal 26, the outflow of oil in the tank of the transformer through the threaded nipple 25 is avoided.
Wherein, offered the slide hole that extends along the axis direction of rotatory passageway in the screw nipple 25, the slide hole runs through screw nipple 25, and screw nipple 25 is provided with along the radial inward flange of slide hole towards the one end of transformer, and first elastic component 23 inserts and establishes in the slide hole, and the one end and the flange butt of first elastic component 23, the other end and the first end butt of play oil pipe 21 of first elastic component 23.
In the initial state, taking the orientation shown in fig. 3 as an example, the first end of the oil outlet pipe 21 is inserted into the threaded nipple 25, the second end of the oil outlet pipe 21 is positioned on the left side of the sealing element 26, at this time, the oil outlet hole is positioned on the left side of the sealing element 26, and the oil outlet pipe 21 can slide along the sliding hole; the oil outlet is arranged on the left side of the sealing piece 26, so that oil in the threaded nipple 25 is prevented from flowing into the oil outlet through the oil outlet, and leakage occurs. In the use process, the connector 301 is connected with the oil outlet pipe 21, and drives the oil outlet pipe 21 to slide along the sliding hole, the connecting pipe 302 is communicated with the oil outlet pipe 21, at this time, the oil outlet hole is communicated with the sliding hole, that is, the oil outlet hole is positioned on the right side of the sealing member 26, the first elastic member 23 is in a compressed state, and the oil in the sliding hole flows into the oil outlet pipe 21 through the oil outlet hole and then flows into the oil storage bottle 303 through the connecting pipe 302; when the joint 301 is separated from the oil outlet pipe 21, the first elastic member 23 provides a restoring force to the oil outlet pipe 21, the oil outlet pipe 21 slides along the slide hole, and the oil outlet hole is located on the left side of the seal member 26, that is, the oil outlet hole is located outside the slide hole.
Wherein, the second elastic member 24 is sleeved on the outer peripheral wall of the threaded nipple 25, one end of the second elastic member 24 abuts against one end of the mounting hole 2211 facing the rotating channel, and the other end of the second elastic member 24 abuts against a stop portion arranged on the threaded nipple 25.
Taking the orientation shown in fig. 3 as an example, in order to prevent the housing 221 from sliding off the mounting tube 222, the left end of the mounting tube 222 is provided with a stop flange 2223 extending radially outwardly of the mounting tube 222, and in the initial state, the operating flange 2213 abuts against the stop flange 2223.
With continued reference to fig. 3-6, the process of connecting the oil extraction mechanism 30 with the oil extraction valve assembly 2 includes the steps of:
s101, one end of the operating member 223 abuts against the operating flange 2213, the operating member 223 pushes the housing 221 to slide along the extending direction of the mounting tube 222 until the large diameter end of the circular truncated cone bore 2212 corresponds to the control bore 2221, and the housing 221 stops sliding.
Specifically, taking the orientation shown in fig. 3 as an example, the housing 221 compresses the second elastic member 24 as it slides rightward along the mounting tube 222.
S102, the oil extraction mechanism 30 moves along the central axis direction of the rotating channel, the connector 301 is inserted into the mounting pipe 222, the connector 301 pushes the ball 224 to slide outwards along the central axis direction of the control hole 2221 until the groove 3011 on the connector 301 corresponds to the control hole 2221, the connector 301 is connected with the oil outlet pipe 21, the connecting pipe 302 is communicated with the oil outlet pipe 21, and the oil outlet hole is communicated with the sliding hole.
Wherein, joint 301 promotes oil outlet pipe 21 to slide along the axis direction of slide opening, and at this moment, oil outlet and slide opening communicate, and first elastic component 23 is in compression.
S103, the operation member 223 moves along the central axis direction of the mounting tube 222, the operation member 223 is separated from the operation flange 2213, the second elastic member 24 provides a restoring force for the housing 221, the housing 221 slides along the mounting tube 222 under the action of the second elastic member 24, the housing 221 pushes the ball 224 to slide inwards along the central axis direction of the control hole 2221 until the ball 224 is partially accommodated in the groove 3011, the housing 221 slides to an initial position, and the joint 301 is locked with the oil extraction valve device 2.
Specifically, the circular truncated cone hole 2212 is provided with an inclined portion, the inclined portion is disposed between the large diameter end and the small diameter end, and the ball 224 is slowly pushed into the groove 3011 under the action of the inclined portion, so that the joint 301 and the oil extraction valve device 2 are locked.
With continued reference to fig. 6, after the connector 301 is locked to the oil extraction valve device 2, the oil in the transformer flows into the oil outlet pipe 21 through the nipple 25, and then flows into the oil storage bottle 303 through the connecting pipe 302.
A detection step of acquiring gray image data of the oil in the oil storage bottle 303 and the oil in the oil storage bottle 303 by using the camera 305, continuing the oil taking step when the gray image data meets a preset threshold value, and completing the oil taking when the gray image data does not meet the preset threshold value, wherein the oil taking device 1 is separated from the oil taking valve device 2; by arranging the camera 305, the automatic detection of the oil extraction device 1 is realized, and the manual participation is avoided, so that the safety and the automation of oil extraction are improved.
Specifically, the camera 305 rotates, when the camera 305 is opposite to the oil storage bottle 303, the camera 305 shoots the oil in the oil storage bottle 303 and the oil in the oil storage bottle 303, and the grayscale image data collected by the camera 305 is compared with a predetermined threshold value to determine whether to continue to take oil.
Wherein the predetermined threshold comprises a predetermined gray value and a predetermined gray pixel duty cycle.
Specifically, when the predetermined gray value is smaller than 121 and the predetermined gray pixel ratio is larger than 60%, the oil extraction device 1 continues to extract oil. When the predetermined gradation value is 121 or more and the predetermined gradation pixel ratio is 60% or less, the oil extraction is ended, and the oil extraction device 1 is separated from the oil extraction valve device 2.
With continued reference to fig. 7-9, the process of disconnecting the oil extraction mechanism 30 from the oil extraction valve assembly 2 includes the steps of:
s201, one end of the operating member 223 abuts against the operating flange 2213, the operating member 223 pushes the housing 221 to slide along the extending direction of the mounting tube 222 until the large diameter end of the circular truncated cone bore 2212 corresponds to the control bore 2221, the housing 221 stops sliding, and the second elastic member 24 is compressed.
And S202, the oil extraction mechanism 30 moves along the central axis direction of the rotating channel in a direction away from the oil outlet pipe 21, the joint 301 pushes the ball 224 to slide outwards along the central axis direction of the control hole 2221, and the joint 301 is separated from the oil extraction valve device 2.
Specifically, taking the orientation shown in fig. 7 as an example, the joint 301 pushes the ball 224 to slide outwards along the central axis direction of the control hole 2221, part of the ball 224 is accommodated in the circular table hole 2212, the first elastic element 23 provides a restoring force for the oil outlet pipe 21, and under the action of the first elastic element 23, the oil outlet pipe 21 slides leftwards along the central axis direction of the sliding hole until the oil outlet hole is located outside the sliding hole.
S203, the operation member 223 moves along the central axis direction of the mounting tube 222, the operation member 223 is separated from the operation flange 2213, the second elastic member 24 provides a restoring force for the housing 221, the housing 221 slides along the mounting tube 222 under the action of the second elastic member 24, the housing 221 pushes the ball 224 to slide inwards along the central axis direction of the control hole 2221, and the housing 221 slides to the initial position.
With continued reference to fig. 2 to 10, in this embodiment, the detecting step specifically includes: the oil extraction mechanism 30 further comprises a laser 304, the laser 304 is located at one side of the oil storage bottle 303, the laser 304 is utilized to emit a light beam 3041 extending along the radial direction of the oil storage bottle 303, the camera 305 collects RGB three-channel image data of the light beam 3041, and gray image data of the light beam 3041 is obtained through calculation according to a weighted average method.
For example, the camera 305 may employ a CCD camera, although other types of cameras 305 may also be employed. In an implementation where the camera 305 employs a CCD camera, RGB three-channel image data of the light beam 3041 is collected, and gray-scale image data of the light beam 3041 is calculated according to a weighted average method.
The calculation formula of the weighted average method is as follows: gray=0.299×r+0.587×g+0.114×b
Where gray is the gray pixel value for the desired location and R, G, B is the component pixel values for the three channels for the desired location.
Further, in this embodiment, before the oil extraction step, the method further includes: with the camera 305 acquiring image data, the camera 305 determines the position of the flowline 21 on the oil pick-up valve device 2 by recognizing the image data.
For example, the camera 305 may employ a 3D camera, and of course, the camera 305 may also employ a CCD camera. In an implementation where the camera 305 employs a 3D camera, the 3D camera is configured to capture a color image, and the 3D camera recognizes the oil outlet pipe 21 on the oil extraction valve device 2 according to shape matching after the grayscale processing of the color image, and at the same time, the 3D camera recognizes the operation member 223 according to shape matching after the grayscale processing of the color image.
The 3D camera recognizes the pixel position of the oil outlet pipe 21 in the color image, the color image of the oil extraction valve device 2 is mapped into the whole image of the transformer, the position of the oil extraction valve device 2 in the 3D camera coordinate system is calculated, and the coordinates of the oil extraction valve device 2 are converted into the coordinate system of the oil extraction device 1 through the spatial coordinate system to finish the positioning of the oil outlet pipe 21.
Further, after the detecting step, further comprising: the laser 304 is used to measure the oil content of the oil contained in the oil storage bottle 303.
In order to ensure the quality of the oil in the oil storage bottle 303, the oil in the oil storage bottle 303 needs to be measured.
The measuring of the oil product of the oil liquid contained in the oil storage bottle 303 by using the laser 304 specifically includes: the camera 305 is used for collecting the image of the light beam 3041 emitted by the laser 304, and the oil in the oil liquid in the oil storage bottle 303 is judged through the preset gray threshold after the image is subjected to gray processing.
Specifically, after the oil in the transformer flows into the oil storage bottle 303, a large amount of bubbles and part of impurities in the connecting pipe 302 are stored in the oil storage bottle 303, a light beam 3041 extending along the radial direction of the oil storage bottle 303 is emitted by the laser 304, an image of the light beam 3041 is collected by the camera 305, and the states of the bubbles and the impurities in the oil storage bottle 303 are judged through a preset gray threshold after the image is subjected to gray processing.
The original light beam 3041 collected by the camera 305 is an RGB three-channel image, and the RGB three-channel image data needs to be converted into a single channel form.
The way to obtain the single channel form is: and according to different sensitivity degrees of red, green and blue, calculating by adopting a weighted average method to obtain a gray image. Graying treatment: gray=0.299×r+0.587× g+0.114×b, where gray is a gray pixel value at the position of interest, and variable R, G, B is a component pixel value of three channels at the position of interest.
In this embodiment, when bubbles and impurities in the oil storage bottle 303 are more, the light beam 3041 will have obvious speckle refraction, and the gray value of the number of pixels corresponding to the image background of the light beam 3041 is obviously high. When the gray value of the number of pixels corresponding to the image background of the light beam 3041 is reduced to a predetermined threshold value, the oil in the oil reservoir 303 reaches a predetermined value.
In order to avoid the reflection bright spot on the outer wall of the oil storage bottle 303, the image shot by the camera 305 is taken from the light beam 3041 area for screenshot analysis, but the pixels of the scattered light beam 3041 emitted by the laser 304 are obviously concentrated and the bright spot is reduced along with the reduction of impurities because the screenshot sizes are slightly different, so that the pixels are represented by the predetermined gray pixel ratio. When the gray value of the partial bright point is smaller than 121 and the gray pixel ratio in the screenshot is larger than 60% of the whole image of the transformer, the oil initial measurement of the oil in the oil storage bottle 303 meets the sampling requirement, so that the accuracy of on-line oil monitoring is improved.
The method of capturing the gray level image of the light beam 3041 emitted by the laser 304 by using the camera 305 may also be used for calibrating the oil volume of the oil in the oil storage bottle 303 before the chromatographic detection.
In another embodiment, the oil extraction mechanism 30 further comprises a drain valve disposed on the outer sidewall of the joint 301, the drain valve being configured to prevent leakage of oil in the transformer in the event of damage to the joint 301; by arranging the drain valve, the safety of oil extraction is further improved.
The oil extraction method for operating the transformer provided by the embodiment comprises the following steps: the oil extraction step is that an oil extraction device 1 is connected with an oil extraction valve device 2 arranged on a transformer, the oil extraction device 1 comprises an oil extraction mechanism 30, and oil in the transformer flows into the oil extraction mechanism 30; the detecting step, the oil extracting mechanism 30 comprises a camera 305 and an oil storage bottle 303, the camera 305 is positioned at the bottom end of the oil storage bottle 303, the camera 305 can rotate relative to the oil storage bottle 303, the camera 305 is used for collecting gray image data of the oil in the oil storage bottle 303 and the oil in the oil storage bottle 303, the oil extracting step is continued under the condition that the gray image data meets a preset threshold, and the oil extracting device 1 is separated from the oil extracting valve device 2 under the condition that the gray image data does not meet the preset threshold; by the arrangement, full automation of oil extraction is realized, and meanwhile, the safety of oil extraction is improved.
It should be noted that in this document relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (7)
1. An oil extraction method for operating a transformer is characterized by comprising the following steps: the method comprises the following steps:
the oil extraction step is that an oil extraction device is connected with an oil extraction valve device arranged on a transformer, the oil extraction device comprises an oil extraction mechanism, and oil in the transformer flows into the oil extraction mechanism;
the detection step, the oil extraction mechanism comprises a camera and an oil storage bottle, the camera is positioned at the bottom end of the oil storage bottle, the camera can rotate relative to the oil storage bottle, the camera is used for collecting gray image data of the oil in the oil storage bottle and the oil in the oil storage bottle, the oil extraction step is continued under the condition that the gray image data meets a preset threshold, the oil extraction is completed under the condition that the gray image data does not meet the preset threshold, and the oil extraction device is separated from the oil extraction valve device;
before the oil extraction step, the method further comprises the following steps:
acquiring image data by using the camera, wherein the camera determines the position of an oil outlet pipe on the oil extraction valve device by identifying the image data;
the detection step specifically comprises the following steps:
the oil extraction mechanism further comprises a laser, the laser is positioned at one side of the oil storage bottle, a light beam extending along the radial direction of the oil storage bottle is sent out by the laser, RGB three-channel image data of the light beam are collected by the camera, and gray image data of the light beam are obtained through calculation according to a weighted average method;
the weighted average method has the following calculation formula:
gray＝0.299×R+0.587×G+0.114×B
wherein gray is the gray pixel value of the required position, R, G, B is the component pixel values of three channels of the required position;
the oil extraction mechanism comprises a joint and a connecting pipe, one end of the connecting pipe is sleeved with the joint, the other end of the connecting pipe is communicated with the oil storage bottle, and the joint is used for being connected with the oil extraction valve device;
the process of connecting the oil extraction mechanism with the oil extraction valve device comprises the following steps:
s101, one end of an operating piece is abutted against an operating flange, the operating piece pushes the shell to slide along the extending direction of the mounting tube until the large-diameter end of the round table hole corresponds to the control hole, and the shell stops sliding;
s102, the oil extraction mechanism moves along the central axis direction of the rotary channel, the connector is inserted into the mounting pipe, the connector pushes the ball body to slide outwards along the central axis direction of the control hole until the groove on the connector corresponds to the control hole, the connector is connected with the oil outlet pipe, the connecting pipe is communicated with the oil outlet pipe, and the oil outlet hole is communicated with the sliding hole;
s103, the operating piece moves along the central axis direction of the mounting tube, the operating piece is separated from the operating flange, the second elastic piece provides restoring force for the shell, the shell slides along the mounting tube under the action of the second elastic piece, the shell pushes the ball to slide inwards along the central axis direction of the control hole until the ball is partially accommodated in the groove, the shell slides to the initial position, and the joint is locked with the oil extraction valve device.
2. The method of oil extraction for operating a transformer of claim 1, wherein: the predetermined threshold includes a predetermined gray value and a predetermined gray pixel duty cycle.
3. The method of oil extraction for operating a transformer of claim 2, wherein: and when the preset gray value is smaller than 121 and the preset gray pixel ratio is larger than 60%, the oil extracting device continues to extract oil.
4. The method of oil extraction for operating a transformer of claim 1, wherein: the oil extraction step specifically comprises the following steps:
the oil extraction mechanism further comprises a joint and a connecting pipe, wherein one end of the connecting pipe is sleeved with the joint, and the other end of the connecting pipe is communicated with the oil storage bottle;
the connector is connected with the oil taking valve device, the connecting pipe is communicated with the oil outlet pipe, and oil in the transformer flows into the oil storage bottle through the connecting pipe.
5. The method of oil extraction for operating a transformer of claim 1, wherein: after the detecting step, further comprising:
and measuring the oil product of the oil liquid accommodated in the oil storage bottle by using the laser.
6. The method of oil extraction for operating a transformer of claim 5, wherein: the oil product of the oil liquid accommodated in the oil storage bottle is measured by the laser, and the method specifically comprises the following steps:
and acquiring the gray value of the light beam emitted by the laser by using the camera, and identifying the oil product in the oil liquid in the oil storage bottle through the gray value.
7. A method of extracting oil from an operating transformer as claimed in claim 3, wherein: the oil extraction mechanism further comprises a drain valve, wherein the drain valve is arranged on the outer side wall of the connector and is used for preventing oil in the transformer from leaking under the condition that the connector is damaged.
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