CN113092373A - Device and method for monitoring dissolved acetylene in oil of oil-filled equipment by using infrared optics - Google Patents
Device and method for monitoring dissolved acetylene in oil of oil-filled equipment by using infrared optics Download PDFInfo
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- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 title claims abstract description 74
- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000031700 light absorption Effects 0.000 claims abstract description 74
- 238000004458 analytical method Methods 0.000 claims abstract description 35
- 230000002238 attenuated effect Effects 0.000 claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims description 82
- 239000013307 optical fiber Substances 0.000 claims description 64
- 230000000670 limiting effect Effects 0.000 claims description 45
- 230000003287 optical effect Effects 0.000 claims description 31
- 238000001514 detection method Methods 0.000 claims description 26
- 238000002835 absorbance Methods 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 16
- 238000009413 insulation Methods 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 7
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- 230000000694 effects Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 125000003003 spiro group Chemical group 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
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- 238000001834 photoacoustic spectrum Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
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- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
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- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
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Abstract
The invention relates to the technical field of on-line monitoring of power equipment, in particular to a device and a method for monitoring dissolved acetylene in oil filled equipment oil by using infrared optics, wherein the device comprises a light source emitting unit, a light source receiving unit, a light source processing unit and a control unit, wherein the light source emitting unit generates a plurality of mid-infrared laser signals with different wavelengths; the sensing unit comprises a plurality of light absorption vessel sensors, the light absorption vessel sensors acquire mid-infrared laser signals and perform multiple total reflection, and a plurality of paths of mid-infrared laser signals attenuated and absorbed by sample insulating oil in the light absorption vessel sensors are output; the acquisition and analysis unit detects the mid-infrared laser signals output by each light absorption vessel sensor and the light source emission unit so as to monitor the acetylene gas. The light absorption vessel sensor is arranged at the hole of the oil filling equipment, the sensing of the fault gas acetylene is realized through light demodulation, the anti-interference capability is strong, the normal work in a complex electromagnetic environment can be realized, meanwhile, the light absorption vessel sensor is small in size, the light absorption vessel sensor can be directly contacted with the insulating oil of a test sample for testing, and the test arrangement is very concise and convenient.
Description
Technical Field
The invention relates to the technical field of on-line monitoring of power equipment, in particular to a device and a method for monitoring dissolved acetylene in oil of oil-filled equipment by using infrared optics.
Background
The oil-filled equipment is a type of electric equipment widely applied to an electric power system and comprises a mutual inductor for realizing an electric measurement function, a transformer for realizing a voltage conversion function, a current-limiting reactor for realizing a current-limiting function and the like; the electric insulating oil in the oil-filled equipment can generate a large amount of combustible gas after being heated and decomposed, and once the equipment fails, fire, explosion and environmental pollution are caused; the analysis of the dissolved gas in the oil is one of the most effective methods for diagnosing and early warning the abnormal state of the oil-filled equipment, and the analysis technology judges which kind of fault exists in the oil-filled equipment based on the mapping relation between the content of the dissolved gas component in the oil and the type of the abnormal state and periodically tracks the development process of the abnormal state. The existing oil-filled equipment dissolved gas on-line monitoring means comprises a composite optical detection method.
The composite optical method is an important method for detecting gas components, and the theoretical basis of the method is the gas molecular infrared spectrum theory and the Lambert-Beer law (Lambert Beer law). The method uses the composite optical detector to directly measure the optical signal, and compared with a thermal conductivity detector, a flame ion detector and a photoacoustic spectrum detector which use electric signals, the method has no photoelectric conversion link, so that the method is not influenced by the complex electromagnetic environment of a transformer substation and the strong mechanical vibration of electrical equipment, and has few measuring influence factors and strong anti-interference capability. The existing composite optical detection method is mostly realized through light conduction absorption, and the problems that the volume of a light absorption chamber is not less than 100mL, a light transmission path is not less than 1000mm and distributed configuration is not facilitated exist in a light conduction absorption mode.
Disclosure of Invention
The invention provides a device and a method for monitoring dissolved acetylene in oil of oil-filled equipment by using infrared optics, which overcome the defects of the prior art and can effectively solve the problems that the volume of a light absorption chamber is large and distributed arrangement is not facilitated in the device for monitoring the dissolved acetylene gas in the oil-filled equipment in the light conduction absorption mode.
One of the technical schemes of the invention is realized by the following measures: a monitoring device for acetylene dissolved in oil of oil-filled equipment using infrared optics comprises a light source emission unit, a sensing unit and a collection and analysis unit;
the light source emission unit generates a plurality of mid-infrared laser signals with different wavelengths, performs multiplexing control on the mid-infrared laser signals, and sequentially outputs the mid-infrared laser signals to the sensing unit and the acquisition and analysis unit; wherein the wavelength interval of the intermediate infrared laser signal is 1450nm to 1650 nm;
the sensing unit comprises a plurality of light absorption vessel sensors, each light absorption vessel sensor is correspondingly arranged at a hole of the oil filling equipment respectively, so that the insulation oil of the sample enters the light absorption vessel sensor, the light absorption vessel sensors acquire mid-infrared laser signals and carry out multiple total reflection in the light absorption vessel sensors, the mid-infrared laser signals in the light absorption vessel sensors, which are consistent with the absorption frequency of acetylene gas dissolved in the insulation oil of the sample, are absorbed by the insulation oil of the sample, and a plurality of paths of mid-infrared laser signals attenuated and absorbed by the insulation oil of the sample in the light absorption vessel sensors are output; wherein the hole comprises a sampling port of the oil filling equipment and a blind hole of the non-electric quantity protection device;
and the acquisition and analysis unit is used for detecting the mid-infrared laser signals output by each light absorption vessel sensor and the light source emission unit and monitoring the acetylene gas dissolved in the oil filling equipment according to the detection result.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the light absorption vessel sensor can comprise a cylindrical fixed base, a screwing hoop and a laser absorption vessel, wherein an oil outlet hole and an oil inlet hole which are vertically communicated and the bottoms of which are communicated with the opening of the laser absorption vessel are arranged at the inner side of the cylindrical fixed base at intervals, the cylindrical fixed base and the laser absorption vessel are fixed together through the screwing hoop to form a sealed oil chamber, sensor fixing external threads are arranged on the outer side of the upper part of the cylindrical fixed base, an annular groove matched with the inner diameter of a hole is arranged on the upper part of the cylindrical fixed base, a first annular sealing ring is arranged in the annular groove, an upper annular sealing groove is arranged at the bottom of the cylindrical fixed base, a lower annular sealing groove corresponding to the upper annular sealing groove is arranged at the top of the laser absorption vessel, second annular sealing rings are arranged in the upper annular sealing groove and the lower annular sealing groove, tail fiber interfaces which are internally and, the outer side of the optical fiber fixing column is wound with a coated total reflection optical fiber, the tail optical fiber comprises an incident optical fiber and a reflection optical fiber, the incident optical fiber and the reflection optical fiber are sealed and fixed in tail optical fiber interfaces at corresponding positions, two ends of the coated total reflection optical fiber are respectively connected with the incident optical fiber and the reflection optical fiber, the coated total reflection optical fiber obtains a mid-infrared laser signal through the incident optical fiber, the mid-infrared laser signal is totally reflected for multiple times through the coated total reflection optical fiber in a laser absorption vessel, and the reflection optical fiber outputs the totally reflected mid-infrared laser signal.
The inner side of the middle part of the oil outlet hole and the inner side of the middle part of the oil inlet hole can be respectively provided with a propeller limiting cross beam, the propeller limiting cross beam is of a square plate-shaped structure, the edge of the propeller limiting cross beam is fixed with the inner walls of the oil outlet hole and the oil inlet hole, the bottom of the propeller limiting cross beam is provided with a propeller limiting hole with a downward opening, a driving motor is arranged in the laser absorption vessel corresponding to the position below the opening bottom of the laser absorption vessel, the upper end of the driving motor is fixedly provided with a driving motor output shaft, the upper end of the driving motor output shaft extends to the inner side of the opening bottom of the laser absorption vessel, and the outer side of the driving;
a first propeller transmission gear meshed with the outer side of the motor driving gear is arranged in an opening of the laser absorption vessel corresponding to the position below the oil inlet hole, a first propeller driving shaft is fixed in the first propeller transmission gear, a first limiting hole which is provided with an upward opening and is matched with the first propeller driving shaft is arranged on the laser absorption vessel corresponding to the position of the bottom end of the first propeller driving shaft, the bottom end of the first propeller driving shaft is sleeved on the inner side of the first limiting hole, the upper end of the first propeller driving shaft extends into the propeller limiting hole on the inner side of the oil inlet hole, and a clockwise propeller is fixed on the outer side of the first propeller driving shaft corresponding to the position below the propeller limiting hole;
a second propeller transmission gear meshed with the outer side of the motor driving gear is arranged in an opening of the laser absorption vessel corresponding to the position below the oil outlet, a second propeller driving shaft is fixed in the second propeller transmission gear, a second limiting hole which is provided with an opening upwards and is matched with the second propeller driving shaft is arranged on the laser absorption vessel corresponding to the position of the bottom end of the second propeller driving shaft, the bottom end of the second propeller driving shaft is sleeved on the inner side of the second limiting hole, the upper end of the second propeller driving shaft extends into the screw limiting hole on the inner side of the oil outlet, and an anticlockwise propeller is fixed on the outer side of the second propeller driving shaft corresponding to the position below the screw limiting hole.
The hoop of screwing can be annular, the cylindricality fixed baseplate lower part outside is equipped with staple bolt fixed thread, the staple bolt upper portion inboard of screwing is equipped with the fixed internal thread corresponding with staple bolt fixed thread, the staple bolt of screwing passes through staple bolt fixed thread and fixed internal thread spiro union with cylindricality fixed baseplate together, the staple bolt lower part inboard of screwing is equipped with the inner ring groove, the upper portion outside of laser absorption ware is equipped with the outer boss corresponding with the inner ring groove, outer boss is located the inner ring inslot side.
The light source emitting unit may include a light source, a light source controller, and a light switching element; the light source is connected with the light switching element, the light source controller is respectively connected with the light source and the light switching element, and the light source controller controls the light source to emit laser signals with different wavelengths, controls the light switching element to multiplex the laser signals and outputs a plurality of paths of laser signals.
The collecting and analyzing unit can comprise an optical detection module and a data collecting and analyzing module, wherein the optical detection module detects mid-infrared laser signals, and the data collecting and analyzing module monitors acetylene gas dissolved in the oil-filled equipment according to detection results; the intermediate infrared laser signals detected by the optical detection module comprise intermediate infrared laser signals attenuated and absorbed by sample insulating oil in the optical absorption vessel sensor and intermediate infrared laser signals emitted by the light source emission unit.
The optical detection module can comprise a first spectrometer and a second spectrometer, the first spectrometer is respectively connected with the data acquisition and analysis module and the optical switching element, and the second spectrometer is respectively connected with the data acquisition and analysis module and each optical absorption vessel sensor.
The second technical scheme of the invention is realized by the following measures: a method for monitoring dissolved acetylene in oil filled equipment oil by using infrared optics comprises the following steps:
the light source emission unit generates mid-infrared laser signals with different wavelengths, performs multiplexing control on the mid-infrared laser signals, and sequentially outputs the mid-infrared laser signals to the sensing unit and the acquisition and analysis unit, wherein the wavelength interval of the mid-infrared laser signals is 1450nm to 1650 nm;
each light absorption vessel sensor attenuates and absorbs the received mid-infrared laser signal, and returns and outputs a plurality of paths of mid-infrared laser signals attenuated and absorbed by the insulating oil of the sample in the light absorption vessel sensor, wherein the mid-infrared laser signals attenuated and absorbed by the light absorption vessel sensor are mid-infrared laser signals with the absorption frequency consistent with that of acetylene gas dissolved in the insulating oil of the sample;
the acquisition and analysis unit detects mid-infrared laser signals output by the light source emission unit and each light absorption vessel sensor, and monitors acetylene gas dissolved in the oil filling equipment according to detection results.
The following is further optimization or/and improvement of the second technical scheme of the invention:
above-mentioned collection analysis unit surveys the mid-infrared laser signal of light source emission unit and every light absorption ware sensor output, monitors the acetylene gas of dissolving in the oil charge equipment according to the probing result, includes:
the first spectrometer receives a mid-infrared laser signal sent by the light source, and the second spectrometer receives a mid-infrared laser signal output by each light absorption vessel sensor after total reflection;
the data acquisition and analysis module calculates the ratio of the intensity of the mid-infrared laser signal emitted by the light source to the intensity of the mid-infrared laser signal output by the reflection optical fiber after total reflection to obtain absorbance, draws a wavelength-absorbance curve graph of the absorbance under different wavelength conditions, calculates the peak area of the wavelength-absorbance curve, and calculates the concentration value of acetylene gas in the sample insulating oil according to the functional relationship between the peak area and the concentration of the acetylene gas;
and according to the concentration value difference of the fault gas acetylene, evaluating, positioning, analyzing and predicting the abnormal state of the sample insulating oil in the oil filling equipment.
The optical absorption vessel sensor is arranged at the position of a sampling port of oil-filled equipment or a hole directly contacted with sample insulating oil such as a blind hole of a non-electric quantity protection device, and the optical absorption vessel sensor is small in size; in addition, the embodiment of the invention realizes the sensing of the fault gas acetylene through the demodulation of light, has strong anti-interference capability and can normally work in a complex electromagnetic environment.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
FIG. 2 is a schematic cross-sectional front view of a second light absorption cell sensor according to an embodiment of the present invention.
FIG. 3 is a side cross-sectional structural view of a second light absorption cell sensor according to an embodiment of the present invention.
Fig. 4 is a schematic front sectional view of a three-column fixing base according to an embodiment of the present invention.
Fig. 5 is a schematic sectional view of a four-fastening hoop according to an embodiment of the present invention.
FIG. 6 is a schematic cross-sectional front view of a laser absorption vessel according to an embodiment of the present invention.
Fig. 7 is a flow chart of a method according to a seventh embodiment of the invention.
FIG. 8 is a flowchart of a method for collecting an analysis unit according to an embodiment of the present invention.
FIG. 9 is a graph showing a wavelength-absorbance curve according to example two of the present invention.
The codes in the figures are respectively: the optical fiber laser device comprises a cylindrical fixed base 1, a screwing hoop 2, a laser absorption vessel 3, a first annular sealing ring 4, a second annular sealing ring 5, a tail fiber connector 6, a hoop fixing thread 7, a fixing internal thread 8, an internal annular groove 9, an external boss 10, an oil outlet hole 11, an oil inlet hole 12, a propeller limiting cross beam 13, a propeller limiting hole 14, a driving motor 15, a driving motor output shaft 16, a motor driving gear 17, a first propeller driving gear 18, a first propeller driving shaft 19, a clockwise propeller 20, a second propeller driving gear 21, a second propeller driving shaft 22, an anticlockwise propeller 23, a sealing oil chamber 24, an optical fiber fixing column 25 and a coated total reflection optical fiber 26.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 2 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 2 of the specification.
The invention is further described with reference to the following examples and figures:
the first embodiment is as follows: as shown in the attached figure 1, the embodiment discloses a device for monitoring acetylene dissolved in oil of oil-filled equipment by using infrared optics, which comprises a light source emitting unit, a sensing unit and a collecting and analyzing unit;
the light source emission unit generates a plurality of mid-infrared laser signals with different wavelengths, performs multiplexing control on the mid-infrared laser signals, and sequentially outputs the mid-infrared laser signals to the sensing unit and the acquisition and analysis unit; wherein the wavelength interval of the intermediate infrared laser signal is 1450nm to 1650 nm;
the sensing unit comprises a plurality of light absorption vessel sensors, each light absorption vessel sensor is correspondingly arranged at a hole of the oil filling equipment respectively, so that the insulation oil of the sample enters the light absorption vessel sensor, the light absorption vessel sensors acquire mid-infrared laser signals and carry out multiple total reflection in the light absorption vessel sensors, the mid-infrared laser signals in the light absorption vessel sensors, which are consistent with the absorption frequency of acetylene gas dissolved in the insulation oil of the sample, are absorbed by the insulation oil of the sample, and a plurality of paths of mid-infrared laser signals attenuated and absorbed by the insulation oil of the sample in the light absorption vessel sensors are output; wherein the hole comprises a sampling port of the oil filling equipment and a blind hole of the non-electric quantity protection device;
and the acquisition and analysis unit is used for detecting the mid-infrared laser signals output by each light absorption vessel sensor and the light source emission unit and monitoring the acetylene gas dissolved in the oil filling equipment according to the detection result.
Among the above-mentioned technical scheme, the sensing unit includes a plurality of light absorption ware sensors, light absorption ware sensor and the hole one-to-one of oil charge equipment, light absorption ware sensor sets up in the hole department that corresponds with it, and light absorption ware sensor and hole spiro union are in the same place, contact with the insulating oil phase of the sample among the oil charge equipment, make the insulating oil of sample among the oil charge equipment enter into the light absorption ware sensor, well infrared laser signal can carry out the total reflection many times in the light absorption ware sensor, the acetylene gas that dissolves in the well infrared laser signal with the acetylene gas absorption frequency unanimity in the light absorption ware sensor by the insulating oil of sample absorbs, output multichannel is by the middle infrared laser signal of the insulating oil attenuation absorption of sample among the oil charge equipment.
This mode of setting up has cancelled traditional gas absorption room, can make the sample insulating oil in the oil charge equipment enter into the light absorption ware sensor again, has reduced gaseous response time to the hole of oil charge equipment shell has a plurality ofly, including gas relay's observation window, makes can realize monitoring the acetylene gas of dissolving in the sample insulating oil in the oil charge equipment through the distribution of light absorption ware sensor.
According to the technical scheme, the collecting and analyzing unit obtains the mid-infrared laser signal output by the light absorption vessel sensor after total reflection, meanwhile, the collecting and analyzing unit obtains the mid-infrared laser signal sent by the light source emitting unit, then the ratio of the intensity of the mid-infrared laser signal sent by the light source emitting unit to the intensity of the mid-infrared laser signal output by the light absorption vessel sensor after total reflection is calculated to obtain the absorbance, the absorbance under different wavelength conditions is made into a curve, namely a wavelength-absorbance curve graph is drawn, the concentration value of acetylene gas dissolved in the sample insulating oil in the oil-filled equipment is obtained by calculating the peak area of the wavelength-absorbance curve graph, and therefore monitoring of the acetylene gas dissolved in the sample insulating oil in the oil-filled equipment is completed.
To sum up, the embodiment of the invention discloses a device for monitoring acetylene dissolved in oil of oil-filled equipment by using infrared optics, wherein a light absorption vessel sensor is arranged at a hole which is directly contacted with insulating oil of a test sample, such as a sampling port of the oil-filled equipment or a blind hole of a non-electric quantity protection device, and the light absorption vessel sensor has small volume; in addition, the embodiment of the invention realizes the sensing of the fault gas acetylene through the demodulation of light, has strong anti-interference capability and can normally work in a complex electromagnetic environment.
Example two: as shown in the attached figures 2 and 3, the embodiment discloses a device for monitoring acetylene dissolved in oil of oil-filled equipment using infrared optics, wherein a light absorption vessel sensor further comprises a cylindrical fixed base 1, a screwing hoop 2 and a laser absorption vessel 3, an oil outlet 11 and an oil inlet 12 which are communicated up and down and the bottom of which is communicated with the opening of the laser absorption vessel 3 are arranged at the inner side of the cylindrical fixed base 1 at intervals, the cylindrical fixed base 1 and the laser absorption vessel 3 are fixed together through the screwing hoop 2 to form a sealed oil chamber 24, the outer side of the upper part of the cylindrical fixed base 1 is provided with a sensor fixing external thread, the upper part of the cylindrical fixed base 1 is provided with a ring groove matched with the inner diameter of a hole, a first annular sealing ring 4 is arranged in the ring groove, the bottom of the cylindrical fixed base 1 is provided with an upper annular sealing groove, the top of the laser, second annular seal rings 5 are arranged in the upper annular seal groove and the lower annular seal groove, tail fiber interfaces 6 which are communicated with each other inside and outside are symmetrically arranged on the outer sides of the laser absorption vessels 3 along a central axis, optical fiber fixing columns 25 are arranged in the laser absorption vessels 3 corresponding to the positions of the tail fiber interfaces 6, coated total reflection optical fibers 26 are wound on the outer sides of the optical fiber fixing columns 25 and comprise incident optical fibers and reflection optical fibers, the incident optical fibers and the reflection optical fibers are hermetically fixed in the tail fiber interfaces 6 corresponding to the positions, two ends of each coated total reflection optical fiber 26 are respectively connected with the incident optical fibers and the reflection optical fibers, the coated total reflection optical fibers 26 acquire mid-infrared laser signals through the incident optical fibers, the mid-infrared laser signals are totally reflected for multiple times through the coated total reflection optical fibers 26 in the laser absorption vessels.
In the above technical solution, the incident optical fiber and the reflective optical fiber can be respectively connected with two ends of the coated total reflection optical fiber 26 in a fusion mode; the two ends of the optical fiber fixing column 25 can be sleeved in the tail fiber interface 6 on the inner side of the laser absorption vessel 3, and can also be bonded at the tail fiber interface 6 through the existing known bonding mode.
Among the above-mentioned technical scheme, cylindricality fixed baseplate 1 can be made by organic insulating material processing such as polytetrafluoroethylene, is equipped with the internal thread that fixes the external screw thread assorted with the sensor in the hole, and cylindricality fixed baseplate 1 and oil-filled equipment pass through the fixed external screw thread of sensor and internal thread spiro union together, realizes that the purpose at oil-filled equipment hole position is fixed to the light absorption ware sensor.
In the technical scheme, the screwing hoop 2 plays a role of a known Glan head in the prior art, can be made of organic insulating materials such as polytetrafluoroethylene and the like, the cylindrical fixing base 1 and the laser absorption vessel 3 are sealed and fixed together by screwing the hoop 2, and the sealing oil chamber 24 is formed in the cylindrical fixing base 1 and the laser absorption vessel 3.
Among the above-mentioned technical scheme, laser absorption ware 3 can be made by organic insulating material processing such as polytetrafluoroethylene for hold the sample insulating oil that enters into laser absorption ware 3 in the oil charge equipment, realize the sealed household utensils of infrared laser signal in the sample insulating oil absorption.
In the technical scheme, when the oil filling device is used, the first annular sealing ring 4 can seal the contact surface between the cylindrical fixing base 1 and the oil filling equipment, so that the leakage of the insulating oil of a test sample from the contact surface between the cylindrical fixing base 1 and the oil filling equipment is avoided; the contact surface between the top of the laser absorption vessel 3 and the bottom of the cylindrical fixed base 1 is sealed by the second annular sealing ring 5, and the leakage of the insulating oil of the test sample from the contact surface between the laser absorption vessel 3 and the cylindrical fixed base 1 is avoided.
In the technical scheme, the mid-infrared laser signal is injected into the laser absorption vessel 3 through the incident optical fiber, is refracted by the test sample insulating oil in the laser absorption vessel 3, and the mid-infrared laser signal with the same acetylene gas absorption frequency is absorbed by acetylene gas molecules dissolved in the test sample insulating oil in the laser absorption vessel 3, so that the output spectral information of the mid-infrared laser signal contains the acetylene gas content information of the test sample insulating oil, and the mid-infrared laser signal containing the acetylene gas content information is output through the reflecting optical fiber.
In the technical scheme, the total optical path of the coated total reflection optical fiber 26 is related to the sensitivity of the light absorption vessel sensor, the larger the total optical path is, the higher the sensitivity of the light absorption vessel sensor is, so that the minimum detection limit value of acetylene gas approaches to or reaches below 2.0 muL/L, and the acetylene gas absorbed by the sample insulating oil in the oil filling equipment is conveniently monitored; if the total optical path is 628cm, the diameter of the coated total reflection optical fiber 26 is 20 μm, the length of the optical fiber fixing column 25 is 2.5cm, and the diameter of the optical fiber fixing column 25 is 0.2cm, at this time, the coated total reflection optical fiber 26 is wound on the optical fiber fixing column 25 in a form of 1000 turns, so as to form a total optical path of 628 cm.
In the above technical scheme, the coated total reflection optical fiber 26 receives the mid-infrared laser signal through the incident optical fiber, so that the mid-infrared laser signal is totally reflected for multiple times through the coated total reflection optical fiber 26, the mid-infrared laser signal with the absorption frequency consistent with the absorption frequency of acetylene gas in the insulation oil of the tested object is absorbed by the insulation oil of the tested object in the laser absorption vessel, and the acquisition and analysis unit receives the mid-infrared laser signal after the total reflection output by the reflection optical fiber. The acquisition and analysis unit calculates the ratio of the intensity of the mid-infrared laser signal emitted by the light source emission unit to the intensity of the mid-infrared laser signal output by the reflection optical fiber to obtain absorbance, and the absorbance under different wavelength conditions is made into a curve, as shown in figure 9; calculating the peak area of the wavelength-absorbance curve (note that the wavelength interval selected during calculation needs to be the wavelength interval corresponding to the peak area of the curve, for example, in fig. 9, the wavelength interval of the mid-infrared laser signal generated by the light source emission unit is 1450nm to 1650nm, and the wavelength interval corresponding to the peak area of the curve is 1500nm to 1570nm, then the wavelength interval is selected to calculate the peak area of the curve), selecting the area of the absorbance curve above the baseline position according to the integration principle during calculation of the peak area of the wavelength-absorbance curve, and the peak area Ps and the concentration of acetylene gas satisfy the functional relationship:
Ps＝1.6014*10-2*C+0.216*10-4
wherein C is the concentration of acetylene gas.
Example three: as shown in fig. 2, 3, 4 and 6, this example discloses a device for monitoring dissolved acetylene in oil of oil-filled equipment using infrared optics, wherein the inner side of the middle part of the oil outlet hole 11 and the inner side of the middle part of the oil inlet hole 12 are both provided with a propeller limiting beam 13, the propeller limiting beam 13 is in a square plate structure, the edge of the propeller limiting beam 13 is fixed with the inner walls of the oil outlet hole 11 and the oil inlet hole 12, the bottom of the propeller limiting beam 13 is provided with a propeller limiting hole 14 with a downward opening, a driving motor 15 is arranged in the laser absorption vessel 3 corresponding to the position below the bottom of the opening of the laser absorption vessel 3, a driving motor output shaft 16 is fixed at the upper end of the driving motor 15, the upper end of the driving motor output shaft 16 extends to the inner side of the bottom of the opening of the laser absorption vessel 3, a motor driving gear 17 is fixed on the outer side of the output shaft 16 of the driving motor corresponding to the inner side position of the opening of the laser absorption vessel 3;
a first propeller transmission gear 18 meshed with the outer side of a motor driving gear 17 is arranged in an opening of the laser absorption vessel 3 corresponding to the position below the oil inlet hole 12, a first propeller driving shaft 19 is fixed in the first propeller transmission gear 18, a first limiting hole which is upward in opening and matched with the first propeller driving shaft 19 is arranged on the laser absorption vessel 3 corresponding to the position of the bottom end of the first propeller driving shaft 19, the bottom end of the first propeller driving shaft 19 is sleeved on the inner side of the first limiting hole, the upper end of the first propeller driving shaft 19 extends into a propeller limiting hole 14 on the inner side of the oil inlet hole 12, and a clockwise propeller 20 is fixed on the outer side of the first propeller driving shaft 19 corresponding to the position below the propeller limiting hole 14;
a second propeller transmission gear 21 meshed with the outer side of the motor driving gear 17 is arranged in an opening of the laser absorption vessel 3 corresponding to the lower position of the oil outlet 11, a second propeller driving shaft 22 is fixed in the second propeller transmission gear 21, a second limiting hole which is provided with an upward opening and is matched with the second propeller driving shaft 22 is arranged on the laser absorption vessel 3 corresponding to the bottom end position of the second propeller driving shaft 22, the bottom end of the second propeller driving shaft 22 is sleeved on the inner side of the second limiting hole, the upper end of the second propeller driving shaft 22 extends into the propeller limiting hole 14 on the inner side of the oil outlet 11, and a counterclockwise propeller 23 is fixed on the outer side of the second propeller driving shaft 22 corresponding to the lower position of the propeller limiting hole 14.
In the technical scheme, the propeller limiting cross beam 13 is transversely arranged in the centers of the oil inlet hole 12 and the oil outlet hole 11, a gap which is convenient for sample insulating oil to flow is formed between the edge of the propeller limiting cross beam 13 and the corresponding oil inlet hole 12 and oil outlet hole 13, the bottom end of the first propeller driving shaft 19 is sleeved in the first limiting hole, and the upper end of the first propeller driving shaft is sleeved in the propeller limiting hole 14 in the corresponding position, so that the position of the first propeller driving shaft 19 is limited, the clockwise propeller 20 is suspended, and the clockwise propeller 20 is prevented from touching the inner wall of the oil inlet hole 12; the bottom suit of second propeller drive shaft 22 is downthehole at the spacing hole of second, and the upper end suit is in the spacing hole of propeller 14 that corresponds the position, carries on spacingly with second propeller drive shaft 22's position from this, realizes the unsettling of anticlockwise propeller 23, avoids anticlockwise propeller 23 to touch the inner wall of oil outlet 11, and the sample insulating oil that is convenient for in the pump oil filling equipment from the inlet port 12 inflow from this flows out from oil outlet 11 behind laser absorption ware 3.
Among the above-mentioned technical scheme, driving motor 15 works under the alternating voltage, the moment of torsion of production transmits to motor drive gear 17 through driving motor output shaft 16, further mesh first propeller drive gear 18 and second propeller drive gear 21 through motor drive gear 17, drive first propeller drive shaft 19 clockwise, drive second propeller drive shaft 22 anticlockwise simultaneously, thereby make clockwise propeller 20 and anticlockwise propeller 23 reverse rotation, wherein clockwise propeller 20 plays the oil pumping effect, anticlockwise propeller 23 plays the oil extraction effect, make the sample insulating oil in the laser absorption dish 3 circulate, improve the response speed of light absorption dish sensor from this.
Example four: as shown in the accompanying drawings 2, 3, 4, 5 and 6, the embodiment discloses a device for monitoring acetylene dissolved in oil of oil-filled equipment using infrared optics, wherein a screwed hoop 2 is annular, the outer side of the lower part of a cylindrical fixing base 1 is provided with a hoop fixing thread 7, the inner side of the upper part of the screwed hoop 2 is provided with a fixing internal thread 8 corresponding to the hoop fixing thread 7, the screwed hoop 2 and the cylindrical fixing base 1 are connected together through the hoop fixing thread 7 and the fixing internal thread 8 in a screwed manner, the inner side of the lower part of the screwed hoop 2 is provided with an inner annular groove 9, the outer side of the upper part of a laser absorption vessel 3 is provided with an outer boss 10 corresponding to the inner annular groove 9, and the outer boss 10 is positioned inside the inner annular groove 9.
Among the above-mentioned technical scheme, the fixed internal thread 8 that the staple bolt 2 upper portion inboard set up of screwing plays the effect of connecting cylindricality fixed baseplate 1, and interior annular groove 9 cooperatees with outer boss 10, plays the effect of providing pressure to laser absorption ware 3, is convenient for laser absorption ware 3 and cylindricality fixed baseplate 1's fixed.
Example five: as shown in fig. 1, the present embodiment discloses a device for monitoring acetylene dissolved in oil of oil-filled equipment using infrared optics, wherein the light source emitting unit further comprises a light source, a light source controller and a light switching element; the light source is connected with the light switching element, the light source controller is respectively connected with the light source and the light switching element, and the light source controller controls the light source to emit mid-infrared laser signals with different wavelengths, controls the light switching element to multiplex the mid-infrared laser signals and outputs multi-path mid-infrared laser signals.
In the technical scheme, the light source can be a high-power continuous spectrum broadband light source, the spectral output waveband of the light source is not less than 4-20000 nm, the total output power is not less than 200mW, the average power density is not less than 100 muW, and mid-infrared laser signals with different wavelengths can be sequentially emitted; the light source controller may be a laser controller for controlling the light source and the light switching element.
Example six: as shown in fig. 1, this embodiment discloses a device for monitoring acetylene dissolved in oil of oil-filled equipment using infrared optics, wherein the acquisition and analysis unit further includes an optical detection module and a data acquisition and analysis module, the optical detection module detects mid-infrared laser signals, and the data acquisition and analysis module monitors acetylene gas dissolved in the oil-filled equipment according to the detection result; the intermediate infrared laser signals detected by the optical detection module comprise intermediate infrared laser signals attenuated and absorbed by sample insulating oil in the optical absorption vessel sensor and intermediate infrared laser signals emitted by the light source emission unit.
In the above technical solution, the optical detection module includes a first spectrometer and a second spectrometer. The first spectrometer acquires a middle infrared laser signal emitted by a light source emission unit; the second spectrometer acquires a mid-infrared laser signal after the total reflection of the light absorption vessel sensor; the data acquisition and analysis module is the prior known technology, monitors acetylene gas dissolved in sample insulating oil in oil-filled equipment, and the monitoring process comprises the following steps: 1. the data acquisition and analysis module calculates the ratio of the intensity of the intermediate infrared laser signal emitted by the light source emission unit to the intensity of the intermediate infrared laser signal output by the reflection optical fiber to obtain absorbance, makes the absorbance under different wavelength conditions into a curve, namely draws a wavelength-absorbance curve graph, and calculates the concentration value of the fault gas acetylene according to the curve graph; 2. on the basis, the abnormal state of the sample insulating oil in the oil-filled equipment is evaluated, positioned, analyzed and predicted.
Example seven: as shown in fig. 7, this embodiment discloses a method for monitoring dissolved acetylene in oil-filled equipment using infrared optics, which includes:
step S101, a light source emission unit generates mid-infrared laser signals with different wavelengths, multiplexing control is carried out on the mid-infrared laser signals, and the mid-infrared laser signals are sequentially output to a sensing unit and a collecting and analyzing unit, wherein the wavelength range of the mid-infrared laser signals is 1450nm to 1650 nm;
step S102, each light absorption vessel sensor attenuates and absorbs the received mid-infrared laser signal, and returns to output a plurality of paths of mid-infrared laser signals attenuated and absorbed by the insulating oil of the sample in the light absorption vessel sensor, wherein the mid-infrared laser signals attenuated and absorbed by the light absorption vessel sensor are mid-infrared laser signals with the absorption frequency consistent with that of acetylene gas dissolved in the insulating oil of the sample;
and S103, detecting the mid-infrared laser signals output by the light source emitting unit and each light absorption vessel sensor by the acquisition and analysis unit, and monitoring the acetylene gas dissolved in the oil filling equipment according to the detection result.
Example eight: as shown in fig. 8, this embodiment discloses a method for monitoring acetylene dissolved in oil-filled equipment using infrared optics, wherein the collecting and analyzing unit detects mid-infrared laser signals output by the light source emitting unit and each light absorption vessel sensor, and monitors acetylene gas dissolved in the oil-filled equipment according to the detection result, further comprising:
step S201, a first spectrometer receives a mid-infrared laser signal emitted by a light source, and a second spectrometer receives a mid-infrared laser signal output by each light absorption vessel sensor after total reflection;
step S202, a data acquisition and analysis module calculates the ratio of the intensity of the mid-infrared laser signal emitted by the light source to the intensity of the mid-infrared laser signal output by the reflection optical fiber after total reflection to obtain absorbance, draws a wavelength-absorbance curve chart of the absorbance under different wavelength conditions, calculates the peak area of the wavelength-absorbance curve, and calculates the concentration value of acetylene gas in the sample insulating oil according to the functional relationship between the peak area and the concentration of the acetylene gas;
and S203, evaluating, positioning, analyzing and predicting the abnormal state of the sample insulating oil in the oil-filled equipment according to the concentration value difference of the fault gas acetylene.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (10)
1. A monitoring device for acetylene dissolved in oil of oil-filled equipment using infrared optics is characterized by comprising a light source emitting unit, a sensing unit and a collecting and analyzing unit;
the light source emission unit generates a plurality of mid-infrared laser signals with different wavelengths, performs multiplexing control on the mid-infrared laser signals, and sequentially outputs the mid-infrared laser signals to the sensing unit and the acquisition and analysis unit; wherein the wavelength interval of the intermediate infrared laser signal is 1450nm to 1650 nm;
the sensing unit comprises a plurality of light absorption vessel sensors, each light absorption vessel sensor is correspondingly arranged at a hole of the oil filling equipment respectively, so that the insulation oil of the sample enters the light absorption vessel sensor, the light absorption vessel sensors acquire mid-infrared laser signals and carry out multiple total reflection in the light absorption vessel sensors, the mid-infrared laser signals in the light absorption vessel sensors, which are consistent with the absorption frequency of acetylene gas dissolved in the insulation oil of the sample, are absorbed by the insulation oil of the sample, and a plurality of paths of mid-infrared laser signals attenuated and absorbed by the insulation oil of the sample in the light absorption vessel sensors are output; wherein the hole comprises a sampling port of the oil filling equipment and a blind hole of the non-electric quantity protection device;
and the acquisition and analysis unit is used for detecting the mid-infrared laser signals output by each light absorption vessel sensor and the light source emission unit and monitoring the acetylene gas dissolved in the oil filling equipment according to the detection result.
2. The device for monitoring the acetylene dissolved in the oil of an oil-filled apparatus using infrared optics according to claim 1, wherein the light absorption vessel sensor comprises a cylindrical fixed base, a screwing hoop and a laser absorption vessel, wherein an oil outlet and an oil inlet which are vertically communicated and the bottom of which is communicated with the opening of the laser absorption vessel are arranged at intervals inside the cylindrical fixed base, the cylindrical fixed base and the laser absorption vessel are fixed together by the screwing hoop to form a sealed oil chamber, a sensor fixing external thread is arranged outside the upper part of the cylindrical fixed base, an annular groove matched with the inner diameter of the hole is arranged on the upper part of the cylindrical fixed base, a first annular seal ring is arranged in the annular groove, an upper annular seal groove is arranged on the bottom of the cylindrical fixed base, a lower annular seal groove corresponding to the upper annular seal groove is arranged on the top of the laser absorption vessel, and a second annular seal, the outer side of the laser absorption vessel is symmetrically provided with tail fiber interfaces which are communicated internally and externally along the central axis, an optical fiber fixing column is arranged in the laser absorption vessel corresponding to the position of the tail fiber interface, the outer side of the optical fiber fixing column is wound with a coated total reflection optical fiber, the tail fiber comprises an incident optical fiber and a reflection optical fiber, the incident optical fiber and the reflection optical fiber are both fixed in the tail fiber interfaces corresponding to the positions in a sealing mode, two ends of the coated total reflection optical fiber are respectively connected with the incident optical fiber and the reflection optical fiber, the coated total reflection optical fiber obtains a mid-infrared laser signal through the incident optical fiber, the mid-infrared laser signal is subjected to multiple total reflection through the coated total reflection optical.
3. The device for monitoring the acetylene dissolved in the oil of the oil-filled equipment using infrared optics according to claim 2, wherein the inner side of the middle part of the oil outlet hole and the inner side of the middle part of the oil inlet hole are both provided with a propeller limiting cross beam, the propeller limiting cross beam is of a square plate-shaped structure, the edges and corners of the propeller limiting cross beam are fixed with the inner walls of the oil outlet hole and the oil inlet hole, the bottom of the propeller limiting cross beam is provided with a propeller limiting hole with a downward opening, a driving motor is arranged in the laser absorption vessel corresponding to the position below the bottom of the opening of the laser absorption vessel, the upper end of the driving motor is fixed with a driving motor output shaft, the upper end of the driving motor output shaft extends to the inner side of the bottom of the opening of the laser absorption vessel, and;
a first propeller transmission gear meshed with the outer side of the motor driving gear is arranged in an opening of the laser absorption vessel corresponding to the position below the oil inlet hole, a first propeller driving shaft is fixed in the first propeller transmission gear, a first limiting hole which is provided with an upward opening and is matched with the first propeller driving shaft is arranged on the laser absorption vessel corresponding to the position of the bottom end of the first propeller driving shaft, the bottom end of the first propeller driving shaft is sleeved on the inner side of the first limiting hole, the upper end of the first propeller driving shaft extends into the propeller limiting hole on the inner side of the oil inlet hole, and a clockwise propeller is fixed on the outer side of the first propeller driving shaft corresponding to the position below the propeller limiting hole;
a second propeller transmission gear meshed with the outer side of the motor driving gear is arranged in an opening of the laser absorption vessel corresponding to the position below the oil outlet, a second propeller driving shaft is fixed in the second propeller transmission gear, a second limiting hole which is provided with an opening upwards and is matched with the second propeller driving shaft is arranged on the laser absorption vessel corresponding to the position of the bottom end of the second propeller driving shaft, the bottom end of the second propeller driving shaft is sleeved on the inner side of the second limiting hole, the upper end of the second propeller driving shaft extends into the screw limiting hole on the inner side of the oil outlet, and an anticlockwise propeller is fixed on the outer side of the second propeller driving shaft corresponding to the position below the screw limiting hole.
4. The device for monitoring the acetylene dissolved in the oil of the oil-filled equipment using the infrared optics according to claim 2 or 3, wherein the tightening hoop is annular, the hoop fixing thread is arranged on the outer side of the lower part of the cylindrical fixing base, the fixing internal thread corresponding to the hoop fixing thread is arranged on the inner side of the upper part of the tightening hoop, the tightening hoop and the cylindrical fixing base are screwed together through the hoop fixing thread and the fixing internal thread, the inner side of the lower part of the tightening hoop is provided with an inner annular groove, the outer side of the upper part of the laser absorption vessel is provided with an outer boss corresponding to the inner annular groove, and the outer boss is positioned on the inner side of the inner annular groove.
5. The apparatus for monitoring dissolved acetylene in oil-filled equipment oil using infrared optics according to claim 1, 2 or 3, wherein the light source emitting unit comprises a light source, a light source controller and a light switching element; the light source is connected with the light switching element, the light source controller is respectively connected with the light source and the light switching element, and the light source controller controls the light source to emit laser signals with different wavelengths, controls the light switching element to multiplex the laser signals and outputs a plurality of paths of laser signals.
6. The apparatus for monitoring dissolved acetylene in oil-filled equipment oil using infrared optics according to claim 4, wherein the light source emitting unit comprises a light source, a light source controller and a light switching element; the light source is connected with the light switching element, the light source controller is respectively connected with the light source and the light switching element, and the light source controller controls the light source to emit mid-infrared laser signals with different wavelengths, controls the light switching element to multiplex the mid-infrared laser signals and outputs multi-path mid-infrared laser signals.
7. The device for monitoring the acetylene dissolved in the oil of the oil-filled equipment by using the infrared optics as claimed in any one of claims 1 to 6, wherein the acquisition and analysis unit comprises an optical detection module and a data acquisition and analysis module, the optical detection module detects the mid-infrared laser signal, and the data acquisition and analysis module monitors the acetylene gas dissolved in the oil-filled equipment according to the detection result; the intermediate infrared laser signals detected by the optical detection module comprise intermediate infrared laser signals attenuated and absorbed by sample insulating oil in the optical absorption vessel sensor and intermediate infrared laser signals emitted by the light source emission unit.
8. The device for monitoring the acetylene dissolved in the oil of the oil-filled equipment using the infrared optics as claimed in claim 7, wherein the optical detection module comprises a first spectrometer and a second spectrometer, the first spectrometer is respectively connected with the data acquisition and analysis module and the optical switching element, and the second spectrometer is respectively connected with the data acquisition and analysis module and each optical absorption vessel sensor.
9. A method for monitoring dissolved acetylene in oil of oil-filled equipment by using infrared optics is characterized by comprising the following steps:
the light source emission unit generates mid-infrared laser signals with different wavelengths, performs multiplexing control on the mid-infrared laser signals, and sequentially outputs the mid-infrared laser signals to the sensing unit and the acquisition and analysis unit, wherein the wavelength interval of the mid-infrared laser signals is 1450nm to 1650 nm;
each light absorption vessel sensor attenuates and absorbs the received mid-infrared laser signal, and returns and outputs a plurality of paths of mid-infrared laser signals attenuated and absorbed by the insulating oil of the sample in the light absorption vessel sensor, wherein the mid-infrared laser signals attenuated and absorbed by the light absorption vessel sensor are mid-infrared laser signals with the absorption frequency consistent with that of acetylene gas dissolved in the insulating oil of the sample;
the acquisition and analysis unit detects mid-infrared laser signals output by the light source emission unit and each light absorption vessel sensor, and monitors acetylene gas dissolved in the oil filling equipment according to detection results.
10. The method for monitoring the acetylene dissolved in the oil of the oil-filled equipment using the infrared optics according to claim 9, wherein the collection and analysis unit detects the mid-infrared laser signals output by the light source emitting unit and each light absorption vessel sensor, and monitors the acetylene gas dissolved in the oil-filled equipment according to the detection result, comprising:
the first spectrometer receives a mid-infrared laser signal sent by the light source, and the second spectrometer receives a mid-infrared laser signal output by each light absorption vessel sensor after total reflection;
the data acquisition and analysis module calculates the ratio of the intensity of the mid-infrared laser signal emitted by the light source to the intensity of the mid-infrared laser signal output by the reflection optical fiber after total reflection to obtain absorbance, draws a wavelength-absorbance curve graph of the absorbance under different wavelength conditions, calculates the peak area of the wavelength-absorbance curve, and calculates the concentration value of acetylene gas in the sample insulating oil according to the functional relationship between the peak area and the concentration of the acetylene gas;
and according to the concentration value difference of the fault gas acetylene, evaluating, positioning, analyzing and predicting the abnormal state of the sample insulating oil in the oil filling equipment.
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