CN110749399A - Conservator capsule leakage detection device and transformer oil storage system - Google Patents
Conservator capsule leakage detection device and transformer oil storage system Download PDFInfo
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- CN110749399A CN110749399A CN201911050095.7A CN201911050095A CN110749399A CN 110749399 A CN110749399 A CN 110749399A CN 201911050095 A CN201911050095 A CN 201911050095A CN 110749399 A CN110749399 A CN 110749399A
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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
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- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N2021/1748—Comparative step being essential in the method
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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- Housings And Mounting Of Transformers (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The application discloses conservator capsule leak testing device and transformer oil storage system, wherein, an conservator capsule leak testing device includes: a fiber optic sensor for placement in the conservator capsule; the optical fiber sensor comprises a housing extending lengthwise, a reflecting part and an optical fiber end; the reflecting part is provided with a reflecting surface used for reflecting the light rays output by the optical fiber end to the optical fiber end; the housing is provided with a metering chamber; the shell is provided with a communication hole which communicates the metering chamber with the outside of the shell; a control unit connected with the optical fiber end through a connecting optical fiber; the control unit can send a laser sending signal to the connecting optical fiber and receive a laser return signal of the connecting optical fiber; and the control unit judges whether the conservator capsule leaks or not according to the laser sending signal and the laser returning signal. The conservator capsule leakage detection device and the transformer oil storage system can find out the conservator capsule leakage problem in time.
Description
Technical Field
The application relates to the field of transformer detection, in particular to an oil conservator capsule leakage detection device and a transformer oil storage system.
Background
With the continuous increase of power grids and transmission capacities, high-capacity transformers are more and more widely used. The oil-immersed transformer has the characteristics of good capacity adaptability, low installation requirement and strong overload capacity, and is widely applied to a power system. Because the transformer oil shoulder plays the role of insulation and cooling, the requirement on quality is high, and the transformer oil shoulder is not allowed to be in direct contact with air in operation. When the oil immersed transformer operates, because load and ambient temperature's change, there is the phenomenon of inflation and shrinkage in the transformer oil, in order to guarantee to avoid transformer oil and atmosphere direct contact at its normal inflation and shrinkage in-process, install the conservator capsule additional usually in the conservator, and normal inflation of transformer, shrinkage (breathing) have both been guaranteed to this mode, have also avoided oil and atmosphere direct contact.
The conservator is the supporting key subassembly of oil-immersed power transformer, also is the essential protective device of power transformer, and the type of present transformer conservator mainly has: the oil conservator comprises an open type oil conservator, a diaphragm type oil conservator, a capsule type oil conservator, a bellows type oil conservator and the like, wherein the capsule type oil conservator is widely used by users at present.
At present, the method for judging the leakage of the conservator capsule mostly depends on a manual method to regularly detect the state of the conservator capsule when the transformer is periodically powered off and overhauled. Because the mode of regular maintenance is adopted, the problem of conservator capsule leakage cannot be found in the first time, and potential safety hazards of the transformer can be caused if the problem of conservator capsule leakage is not found in time.
Disclosure of Invention
In order to solve the above problems, an object of the present application is to provide a conservator capsule leakage detection device and a transformer oil storage system, so as to be able to find out the conservator capsule leakage problem in time.
In order to achieve the purpose, the technical scheme is as follows:
an conservator capsule leak detection device, comprising:
a fiber optic sensor for placement in the conservator capsule; the optical fiber sensor comprises a housing extending lengthwise, a reflecting part arranged at one end of the housing, and an optical fiber end arranged at the other end of the housing; the optical fiber end is used for inputting and outputting light; the reflecting part is provided with a reflecting surface used for reflecting the light rays output by the optical fiber end to the optical fiber end; the housing is provided with a metering chamber between the optical fiber end and the reflection part; the shell is provided with a communication hole which communicates the metering chamber with the outside of the shell;
a control unit connected with the optical fiber end through a connecting optical fiber; the control unit can send a laser sending signal to the connecting optical fiber and receive a laser return signal of the connecting optical fiber; and the control unit judges whether the conservator capsule leaks or not according to the laser sending signal and the laser returning signal.
As a preferred embodiment, the control unit can calculate the coupling efficiency of the laser sending signal and the laser returning signal and determine that the conservator capsule leaks when the coupling efficiency is greater than a predetermined value; the controller calculates the coupling efficiency according to the following formula:
wherein μ is the coupling efficiency; r0Is the reflectivity of the fiber optic sensor;
the phase difference of the two beams of light reflected by the reflecting part and the optical fiber end in the metering cavity is shown; n is0Is the refractive index of the medium in the metering chamber, L is the length of the metering chamber, and λ is the wavelength of the laser.
As a preferred embodiment, the connection optical fiber comprises an inner optical fiber positioned inside the conservator capsule, and an armored optical cable positioned outside the conservator capsule; the armored optical cable is internally provided with a transmission optical fiber connected with the internal optical fiber.
As a preferred embodiment, the housing is provided with a plurality of communication holes; at least two communication holes are oppositely arranged to form a pair of flow holes.
In a preferred embodiment, the angle between the light output from the optical fiber end and the reflecting surface is more than 80 degrees.
A transformer oil storage system comprising:
a conservator housing;
the conservator capsule is positioned inside the conservator shell; an oil storage space is formed inside the conservator shell outside the conservator capsule;
set up in conservator capsule leakage detection device on the conservator casing includes:
a fiber optic sensor disposed in the conservator capsule; the optical fiber sensor comprises a housing extending lengthwise, a reflecting part arranged at one end of the housing, and an optical fiber end arranged at the other end of the housing; the optical fiber end is used for inputting and outputting light; the reflecting part is provided with a reflecting surface used for reflecting the light rays output by the optical fiber end to the optical fiber end; the housing is provided with a metering chamber between the optical fiber end and the reflection part; the shell is provided with a communication hole which communicates the metering chamber with the outside of the shell;
an external control unit located in the conservator housing; the control unit is connected with the optical fiber end through a connecting optical fiber; the control unit can send a laser sending signal to the connecting optical fiber and receive a laser return signal of the connecting optical fiber; and the control unit judges whether the conservator capsule leaks or not according to the laser sending signal and the laser returning signal.
As a preferred embodiment, the connection optical fiber comprises an inner optical fiber positioned inside the conservator capsule, and an armored optical cable positioned outside the conservator capsule; the armored optical cable is internally provided with a transmission optical fiber connected with the internal optical fiber.
As a preferred embodiment, a flange connecting port is arranged on the oil conservator shell, and a flange cover plate is fixedly connected to the flange connecting port; the conservator capsule leakage detection device also comprises an external connector and an internal connector which are fixed on the flange cover plate; the armored optical cable is connected with the external connector and the control unit; the internal optical fiber connects the interconnection joint and the optical fiber sensor.
As a preferred embodiment, the control unit can calculate the coupling efficiency of the laser sending signal and the laser returning signal and determine that the conservator capsule leaks when the coupling efficiency is greater than a predetermined value; the controller calculates the coupling efficiency according to the following formula:
wherein μ is the coupling efficiency; r0Is the reflectivity of the fiber optic sensor;
the phase difference of the two beams of light reflected by the reflecting part and the optical fiber end in the metering cavity is shown; n is0Is the refractive index of the medium in the metering chamber, L is the length of the metering chamber, and λ is the wavelength of the laser.
As a preferred embodiment, the housing is provided with a plurality of communication holes; at least two communication holes are oppositely arranged to form a pair of flow holes.
Has the advantages that:
the utility model provides a conservator capsule leak testing device is equipped with the optical fiber sensor who puts into the conservator capsule, utilizes this optical fiber sensor's measurement cavity to introduce the medium in the capsule, and the laser that utilizes optical fiber sensor's optic fibre end to send out the medium that the signal passed the measurement cavity and is received by the optic fibre end after the reflection surface reflection of reflection part and form laser return signal, and later laser return signal sends into the control unit through connecting optic fibre in, the control unit basis the laser send out the signal with laser return signal judges whether the conservator capsule leaks to can carry out real-time detection to transformer conservator capsule, judge whether it leaks, make things convenient for the maintainer in time to maintain it, avoid transformer operation hidden danger.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a transformer oil storage system according to an embodiment of the present application;
FIG. 2 is a schematic view of the conservator capsule leak detection apparatus of FIG. 1;
fig. 3 is a schematic view of the structure of the optical fiber sensor of fig. 2.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Please refer to fig. 1 to 3. One embodiment of the present application provides a conservator capsule leak detection device, including: a fiber optic sensor 2 for placement in the conservator capsule 200; a control unit 1 connected to the fiber end 21 by a connecting fiber 3.
The optical fiber sensor 2 includes a housing 20 extending lengthwise, a reflection portion 22 disposed at one end of the housing 20, and an optical fiber end 21 disposed at the other end of the housing 20. The reflecting portion 22 and the optical fiber end 21 are located at both ends of the housing 20, respectively. The fiber end 21 is used for inputting and outputting light. The reflection portion 22 has a reflection surface 23 for reflecting the light output from the optical fiber end 21 to the optical fiber end 21. The housing 20 is provided with a metering chamber 24 between the fibre end 21 and the reflector 22. The housing 20 is provided with a communication hole 25 for communicating the metering chamber 24 with the outside of the housing 20.
The control unit 1 is capable of transmitting a laser transmission signal to the connection optical fiber 3 and receiving a laser return signal of the connection optical fiber 3; the control unit 1 determines whether the conservator capsule 200 leaks or not according to the laser sending signal and the laser returning signal.
The conservator capsule leakage detection device provided by the embodiment is provided with the optical fiber sensor 2 placed in the conservator capsule 200, a measured medium 26 in the capsule is introduced by using a metering cavity 24 of the optical fiber sensor 2, a laser sending signal sent by an optical fiber end 21 of the optical fiber sensor 2 penetrates through the medium 26 of the metering cavity 24 and is reflected by a reflecting surface 23 of a reflecting part 22 to be received by the optical fiber end 21 to form a laser return signal, then the laser return signal is sent into the control unit 1 through the connecting optical fiber 3, and the control unit 1 judges whether the conservator capsule 200 leaks according to the laser sending signal and the laser return signal, so that the transformer conservator capsule 200 can be detected in real time, whether the transformer conservator capsule leaks or not is judged, convenience is brought to maintenance of the transformer capsule in time, and potential operation hazards of the transformer are avoided.
When in use, the control unit 1 sends a laser sending signal to the connecting optical fiber 3, and the laser sending signal reaches the optical fiber end 21 of the optical fiber sensor 2 through the connecting optical fiber 3 and is transmitted out to the metering chamber 24 through the optical fiber end 21. The metering chamber 24 opens into the interior of the conservator capsule 200 and introduces the medium under test 26 into the interior of the conservator capsule 200.
Before the conservator capsule 200 leaks, air is introduced into the metering chamber 24, after the conservator capsule 200 leaks, oil enters the conservator capsule 200 and then enters the metering chamber 24, and therefore before and after the conservator capsule 200 leaks, media 26 which are contacted with optical signals sent by the optical fiber end 21 are air and transformer oil respectively. When the media 26 are different, the reflectivity and the refractive index of the optical signal optical path are also different, and after the actual test, the coupling efficiency and the light transmittance of the optical path are also changed after the media 26 are changed, and the control unit 1 of this embodiment determines whether the conservator capsule 200 leaks or not by measuring the change value of the optical signal. The control unit 1 of the present embodiment compares the coupling efficiency of the output power and the return power with a predetermined value, so as to eliminate the influence of the interference signal and other media 26, and improve the accuracy of detecting the leakage.
In the present embodiment, the conservator capsule 200 is located in the conservator housing 100. The interior of the conservator housing 100 is evacuated and then transformer oil is injected. The conservator capsule 200 is connected to the outside of the conservator housing 100 through a breather, and the inside of the conservator capsule 200 is filled with a certain amount of air, and the inside of the conservator capsule 200 has a certain positive pressure. The optical fiber sensor 2 is located in the conservator capsule 200, the inner optical fiber 32 may have a certain length, and the optical fiber sensor 2 may be placed at a desired position in the conservator capsule 200, for example, the optical fiber sensor 2 may be placed at a position of the conservator capsule 200 where oil is prone to leak.
The laser output signal passes through the medium 26 to be measured in the measurement chamber 24, is reflected by the reflection surface 23 of the reflection portion 22, returns, and is received again by the optical fiber end 21. When leakage occurs, transformer oil enters the housing 20 and the power of the laser signal passing through the transformer oil is attenuated compared to air. The control unit 1 can demodulate the power of the laser signal and accurately judge whether the conservator capsule 200 leaks.
The conservator capsule leakage detection apparatus of the present embodiment determines whether the conservator capsule 200 is leaking or not by the change of the optical path coupling efficiency. Specifically, the control unit 1 can calculate the coupling efficiency of the laser sending signal and the laser returning signal and determine that the conservator capsule 200 leaks when the coupling efficiency is greater than a predetermined value. Specifically, the controller calculates the coupling efficiency according to the following formula:
wherein μ is the coupling efficiency; r0Is the reflectivity of the fiber optic sensor;
the phase difference of the two beams of light reflected by the reflecting part and the optical fiber end in the metering cavity is shown; n is0Is the refractive index of the medium in the metering chamber, L is the length of the metering chamber, and λ is the wavelength of the laser.
The units of the parameters may be unified, and in this embodiment, the units of the parameters may be unified into international units. L and λ are in meters. Reflectivity R of optical fiber sensor0Is the sum of the reflectivity of the reflecting portion and the reflectivity of the fiber end.
Specifically, in the present embodiment, I0Is the incident light intensity; i isRFor reflected light intensity (i.e. output light intensity), the corresponding relationship between reflected light intensity and incident light intensity is:
R0in order to be the reflectivity of the optical fiber sensor,
for both reflection by the reflecting part and by the surface of the optical fiber end in the metering chamberThe phase difference of the light beams is small,
the calculation formula of (a) is as follows:
wherein n is0Is the refractive index of the medium within the cavity; l is the length of the metering chamber, m; λ is the wavelength of the laser, m.
The calculation formula of the optical power P is as follows:
P＝IA
wherein I is the light intensity and A is the cross-sectional area of the light, so that the input power is P0＝I0A, output power is PR＝IRA, the coupling efficiency is calculated as follows:
the conservator capsule leakage detection device provided by the embodiment can realize the transmission of laser sending-out signals and laser return signals by utilizing the same connecting optical fiber 3 through the optical fiber end 21 and the reflection part 22 which are positioned at two sides of the metering cavity 24, avoids additionally arranging a receiver and a return optical fiber, and particularly has the advantages that compared with the penetrating requirement of a plurality of optical fibers, the installation requirement can be greatly reduced by one single optical fiber, and the manufacturing and cost reduction are facilitated.
In the present embodiment, the media 26 of the optical fiber sensor 2 contacting before and after the conservator capsule 200 leaks are air and transformer oil, respectively. When the media 26 are different, the reflectivity and refractive index of the fiber optic path are also different. Actual tests show that: after the measured medium 26 changes, the coupling efficiency and the light transmittance of the optical path also change, and whether the conservator capsule 200 leaks can be determined by measuring the change value.
Specifically, the housing 20 is cylindrical. The reflection portion 22 closes one end of the housing 20, an inner wall surface of the reflection portion 22 is a reflection surface 23, and the reflection surface 23 is a mirror reflection structure, and reflects the light output from the optical fiber end 21. The fiber end 21 is located at the other end of the housing 20. The fiber end 21 is preferably located at the center of the other end of the housing 20. The inner wall surface of the reflection portion 22 may be the reflection surface 23 entirely, or a region partially facing the optical fiber end 21 may be the reflection surface 23, and the present application is not limited to this. The light output by the optical fiber end 21 is substantially perpendicular to the reflection surface 23, and preferably, an included angle between the light output by the optical fiber end 21 and the reflection surface 23 is more than 80 degrees, so that the returned optical signal can be ensured to have better signal intensity and can be identified.
The measured medium 26 (e.g., air or transformer oil) in the conservator capsule 200 enters the metering chamber 24 through the communication hole 25. In order to facilitate rapid detection of a leak from the conservator capsule 200, the housing 20 is provided with a plurality of communication holes 25; at least two communication holes 25 are oppositely arranged to form a pair of flow holes. As shown in fig. 3, three communication holes 25 are respectively provided at both sides of the housing 20, and the opposite two convection holes form a convection hole. Two convection holes can be respectively input into the metering chamber 24 from two sides, and when the transformer oil enters into the metering chamber 24 from the communication hole 25 on one side, air in the metering chamber 24 can escape outwards from the other side, so that the occurrence of leakage can be quickly detected.
The conservator capsule leakage detection device provided by the embodiment can be widely applied to capsule type conservators and has universality. The conservator capsule leakage detection device provided by the embodiment adopts an integrated method of the conservator capsule 200 and the metering chamber 24, the metering chamber 24 is placed inside the conservator capsule 200, the measured medium 26 can be collected by the optical fiber sensor 2 through the convection hole of the measured medium 26, and finally the measured medium is transmitted to the control unit 1 through the connecting optical fiber 3 for demodulation.
Please continue to refer to fig. 1 to fig. 3. Based on the same concept, the invention also provides a transformer oil storage system, as described in the following embodiments. Because the principle of solving the problems of the transformer oil storage system and the technical effect which can be obtained are similar to those of the conservator capsule leakage detection device, the implementation of the transformer oil storage system can refer to the implementation of the conservator capsule leakage detection device, and repeated parts are not repeated.
Another embodiment of the present application further provides a transformer oil storage system, including: a conservator housing 100; an conservator capsule 200 located inside the conservator housing 100; and the conservator capsule leakage detection device is arranged on the conservator shell 100. The interior of the conservator housing 100 forms an oil storage space 101 outside the conservator capsule 200. The conservator housing 103 is provided with a liquid level gauge 103. The inside of the conservator housing 103 is provided with a liquid level ball 102, the liquid level ball 102 floats on the transformer oil and is connected with a liquid level meter 103, and the liquid level meter 103 displays the liquid level height in the conservator housing 103 through the position of the liquid level ball 102.
The conservator capsule leakage detection device comprises: a fiber optic sensor 2 placed in the conservator capsule 200; a control unit 1 located outside the conservator housing 100.
The optical fiber sensor 2 includes a housing 20 extending lengthwise, a reflection portion 22 disposed at one end of the housing 20, and an optical fiber end 21 disposed at the other end of the housing 20; the optical fiber end 21 is used for inputting and outputting light; the reflection part 22 has a reflection surface 23 for reflecting the light output from the optical fiber end 21 to the optical fiber end 21; the housing 20 is provided with a metering chamber 24 between the fiber end 21 and the reflector 22; the housing 20 is provided with a communication hole 25 for communicating the metering chamber 24 with the outside of the housing 20.
The control unit 1 is connected with the optical fiber end 21 through a connecting optical fiber 3. The control unit 1 is capable of transmitting a laser transmission signal to the connection optical fiber 3 and receiving a laser return signal of the connection optical fiber 3; the control unit 1 determines whether the conservator capsule 200 leaks or not according to the laser sending signal and the laser returning signal.
Specifically, the connection optical fiber 3 includes an inner optical fiber 32 located inside the conservator capsule 200, and an armored optical cable 31 located outside the conservator capsule 200. The armored optical cable 31 has a transmission optical fiber connected to the inner optical fiber 32 inside.
In order to solve the influence of the internal pressure of the capsule on the connection mode, the connection of the internal optical fiber and the external optical fiber of the conservator capsule 200 is ensured. The oil conservator shell 100 is provided with a flange connector, and a flange cover plate 4 is fixedly connected to the flange connector. The conservator capsule leakage detection device further comprises an external connector 41 and an internal connector 42 which are fixed on the flange cover plate 4. The connection optical fiber 3 includes an armored optical cable 31 connecting the external connector 41 and the control unit 1, and an internal optical fiber 32 connecting the internal connector 42 and the optical fiber sensor 2. The flange cover plate 4 plays a role of connecting the internal optical fiber 32 and the armored optical cable 31, and avoids the influence of the internal pressure of the conservator capsule 200 needing sealing.
Any numerical value recited herein includes all values from the lower value to the upper value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 41, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.
Claims (10)
1. A conservator capsule leak testing device, comprising:
a fiber optic sensor for placement in the conservator capsule; the optical fiber sensor comprises a housing extending lengthwise, a reflecting part arranged at one end of the housing, and an optical fiber end arranged at the other end of the housing; the optical fiber end is used for inputting and outputting light; the reflecting part is provided with a reflecting surface used for reflecting the light rays output by the optical fiber end to the optical fiber end; the housing is provided with a metering chamber between the optical fiber end and the reflection part; the shell is provided with a communication hole which communicates the metering chamber with the outside of the shell;
a control unit connected with the optical fiber end through a connecting optical fiber; the control unit can send a laser sending signal to the connecting optical fiber and receive a laser return signal of the connecting optical fiber; and the control unit judges whether the conservator capsule leaks or not according to the laser sending signal and the laser returning signal.
2. The conservator capsule leak detection apparatus of claim 1, wherein the control unit is capable of calculating a coupling efficiency of the laser send signal and the laser return signal and determining the conservator capsule leak when the coupling efficiency is greater than a predetermined value; the controller calculates the coupling efficiency according to the following formula:
wherein μ is the coupling efficiency; r0Is the reflectivity of the fiber optic sensor;
the phase difference of the two beams of light reflected by the reflecting part and the optical fiber end in the metering cavity is shown; n is0Is the refractive index of the medium in the metering chamber, L is the length of the metering chamber, and λ is the wavelength of the laser.
3. The conservator capsule leak detection apparatus of claim 1 or 2, wherein the connecting optical fiber comprises an internal optical fiber inside the conservator capsule, and an armored optical cable outside the conservator capsule; the armored optical cable is internally provided with a transmission optical fiber connected with the internal optical fiber.
4. The conservator capsule leak detection apparatus as claimed in claim 1, wherein the housing is provided with a plurality of communication holes; at least two communication holes are oppositely arranged to form a pair of flow holes.
5. The conservator capsule leak detection device of claim 1, wherein the angle between the light output by the fiber end and the reflective surface is above 80 degrees.
6. A transformer oil storage system, comprising:
a conservator housing;
the conservator capsule is positioned inside the conservator shell; an oil storage space is formed inside the conservator shell outside the conservator capsule;
set up in conservator capsule leakage detection device on the conservator casing includes:
a fiber optic sensor disposed in the conservator capsule; the optical fiber sensor comprises a housing extending lengthwise, a reflecting part arranged at one end of the housing, and an optical fiber end arranged at the other end of the housing; the optical fiber end is used for inputting and outputting light; the reflecting part is provided with a reflecting surface used for reflecting the light rays output by the optical fiber end to the optical fiber end; the housing is provided with a metering chamber between the optical fiber end and the reflection part; the shell is provided with a communication hole which communicates the metering chamber with the outside of the shell;
an external control unit located in the conservator housing; the control unit is connected with the optical fiber end through a connecting optical fiber; the control unit can send a laser sending signal to the connecting optical fiber and receive a laser return signal of the connecting optical fiber; and the control unit judges whether the conservator capsule leaks or not according to the laser sending signal and the laser returning signal.
7. The transformer oil storage system of claim 6, wherein the connecting optical fiber comprises an inner optical fiber located inside the conservator capsule, and an armored optical cable located outside the conservator capsule; the armored optical cable is internally provided with a transmission optical fiber connected with the internal optical fiber.
8. The transformer oil storage system according to claim 7, wherein a flange connector is arranged on the conservator shell, and a flange cover plate is fixedly connected to the flange connector; the conservator capsule leakage detection device also comprises an external connector and an internal connector which are fixed on the flange cover plate; the armored optical cable is connected with the external connector and the control unit; the internal optical fiber connects the interconnection joint and the optical fiber sensor.
9. The transformer oil storage system of claim 6, wherein the control unit is capable of calculating a coupling efficiency of the laser send signal and the laser return signal and determining the conservator capsule leakage when the coupling efficiency is greater than a predetermined value; the controller calculates the coupling efficiency according to the following formula:
wherein μ is the coupling efficiency; r0Is the reflectivity of the fiber optic sensor;the phase difference of the two beams of light reflected by the reflecting part and the optical fiber end in the metering cavity is shown; n is0Is the refractive index of the medium in the metering chamber, L is the length of the metering chamber, and λ is the wavelength of the laser.
10. The transformer oil storage system according to claim 6, wherein the case is provided with a plurality of communication holes; at least two communication holes are oppositely arranged to form a pair of flow holes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112461451A (en) * | 2020-09-18 | 2021-03-09 | 沈阳众诚自动化设备有限公司 | Novel leakage detector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182437A (en) * | 2015-09-29 | 2015-12-23 | 国家电网公司 | Online monitoring device and online monitoring method for converter transformer conservator capsule breaking |
| CN105466638A (en) * | 2015-12-14 | 2016-04-06 | 重庆航伟光电科技有限公司 | System for leakage monitoring and protection of energy transmission fiber |
| CN105910764A (en) * | 2016-02-29 | 2016-08-31 | 国家电网公司 | Transformer oil conservator capsule rupture detection apparatus and method |
| CN108398211A (en) * | 2018-01-15 | 2018-08-14 | 中北大学 | Distribution type fiber-optic leakage sensor and leakage detection method based on external source positioning |
| CN108548547A (en) * | 2018-03-29 | 2018-09-18 | 中国科学院合肥物质科学研究院 | A kind of fiber optic oxygen sensor for petroleum storage tank leakage monitoring |
| CN108871697A (en) * | 2018-05-07 | 2018-11-23 | 长沙理工大学 | A kind of gas leakage detection device of all optical fibre structure |
-
2019
- 2019-10-31 CN CN201911050095.7A patent/CN110749399B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182437A (en) * | 2015-09-29 | 2015-12-23 | 国家电网公司 | Online monitoring device and online monitoring method for converter transformer conservator capsule breaking |
| CN105466638A (en) * | 2015-12-14 | 2016-04-06 | 重庆航伟光电科技有限公司 | System for leakage monitoring and protection of energy transmission fiber |
| CN105910764A (en) * | 2016-02-29 | 2016-08-31 | 国家电网公司 | Transformer oil conservator capsule rupture detection apparatus and method |
| CN108398211A (en) * | 2018-01-15 | 2018-08-14 | 中北大学 | Distribution type fiber-optic leakage sensor and leakage detection method based on external source positioning |
| CN108548547A (en) * | 2018-03-29 | 2018-09-18 | 中国科学院合肥物质科学研究院 | A kind of fiber optic oxygen sensor for petroleum storage tank leakage monitoring |
| CN108871697A (en) * | 2018-05-07 | 2018-11-23 | 长沙理工大学 | A kind of gas leakage detection device of all optical fibre structure |
Non-Patent Citations (2)
| Title |
|---|
| 张樱子: ""基于塑料光纤侧面耦合效应的液漏传感关键技术研究"", 《中国博士学位论文全文数据库 工程科技II辑》 * |
| 潘小青: "《物理实验教程》", 30 December 2016 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112461451A (en) * | 2020-09-18 | 2021-03-09 | 沈阳众诚自动化设备有限公司 | Novel leakage detector |
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