CN105136678A - Sensing device for hydrogen dissolved in anti-seismic type transformer oil - Google Patents
Sensing device for hydrogen dissolved in anti-seismic type transformer oil Download PDFInfo
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- CN105136678A CN105136678A CN201510696037.7A CN201510696037A CN105136678A CN 105136678 A CN105136678 A CN 105136678A CN 201510696037 A CN201510696037 A CN 201510696037A CN 105136678 A CN105136678 A CN 105136678A
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Abstract
The invention provides a sensing device for hydrogen dissolved in anti-seismic type transformer oil. The sensing device comprises a hydrogen sensitive film-hydrogen sensor, wherein the hydrogen sensitive film is bonded to a cylindrical optical fiber Bragg grating substrate through a transition layer. The sensing device is characterized in that a transverse gap is formed in the gate region of the optical fiber Bragg grating substrate, so that the cross section of the position, at the gap, of the optical fiber Bragg grating substrate is shaped like an English letter D, and the hydrogen sensitive film is bonded to the plane, parallel to the substrate, of the gap. By means of the sensing device, the special requirement for detecting the hydrogen dissolved in the transformer oil can be well met, influences, caused by vibration of a transformer and circulating flow of the oil, on the sensor are greatly reduced, and meanwhile detection of the hydrogen dissolved in the oil is guaranteed.
Description
Technical field
The present invention relates in a kind of Anti-seismic transformer oil and dissolve hydrogen sensing device.
Background technology
Power transformer is the key equipment in operation of power networks, and safe and reliable power transformer is that the normal operation of electrical network provides safeguard.Transformer oil, under heat and electric effect, can decompose and produces multiple gases and be dissolved in transformer oil, the composition of the type of power transformer interior fault and the order of severity and these gas molecules and gas production rate close relation.Therefore, Gases Dissolved in Transformer Oil analysis is the effective ways of diagnosis oil-immersed power transformer Hidden fault.When low-yield fault appears in transformer, the c h bond fracture that in oil, chemical bond energy is the most weak, most of hydrogen ion will regroup as hydrogen.Therefore, when there is early stage low energy fault, hydrogen is principal character gas, and the hydrogen of generation is mainly present in transformer oil with suspended state or dissolved state.General transformer initial failure is all first occur faint shelf depreciation or low temperature hot spot phenomenon, and hydrogen is initial failure gas, therefore can carry out anti-initial failure situation by hydrogen situation in monitoring transformer oil.
Detect hydrogen and can adopt Fiber Bragg Grating FBG hydrogen gas sensor, it has, and ageing and antijamming capability is strong, volume is little, directly can be placed in transformer oil and not need gas-oil separation, Real-Time Monitoring and have the advantages such as high monitoring degree of accuracy.
Existing fiber grating encapsulation technology is divided into protectiveness encapsulation, sensitization encapsulation and compensatory encapsulation, and protectiveness encapsulation technology has surface-mount type encapsulation, tube-packaged, and sensitization encapsulates to be divided into enhanced sensitivity to encapsulate and to subtract sensitivity and encapsulates.Wherein, FBG sensor entirety is all pasted onto on substrate by existing surface-mount type encapsulation, sensitization encapsulation and compensatory encapsulation.And FGB sensor needs directly to contact with transformer oil, hydrogen sensitive film is absorbed in oil and dissolves hydrogen thus on grid region, produce the stress corresponding to and dissolve density of hydrogen in oil, thus realize the detection of dissolving hydrogen in oil.Above-mentioned encapsulation adopts FBG sensor entirety to be pasted onto on substrate, reduces the contact area of hydrogen sensitive film and sensor, and is pasted onto strain substrate reducing to a certain extent and produces after hydrogen sensitive film inhales hydrogen-expansion because FBG sensor is overall.Therefore, surface-mount type encapsulation, sensitization encapsulation and compensatory encapsulation are not all suitable in oil dissolves hydrogen FBG sensor.
Its primary structure of tube-packaged is the spacing becket in stainless-steel tube, adhesive, fiber grating and two ends.The becket at stainless-steel tube two ends is to having encapsulated position-limiting action.Adhesive then for fixed fiber grating in stainless-steel tube center, and effectively transmit strain and temperature variation on fiber grating, therefore have very strict requirement to adhesive.Encapsulation process also has requirement to adhesive, must have good mobility, and its setting rate also must be very fast, therefore often select epoxy resin.
First must smear alcohol washes to inside and outside stainless-steel tube before tube-packaged, while decontamination, ensure the cementability of itself and epoxy resin.Be the combination of stainless-steel tube and fiber grating afterwards, fiber grating must slowly penetrate in steel pipe by this process extremely carefully.In order to keep the stable of steel pipe, employ accurate fiber adjusting mount.Finally also need with epoxy resin, fiber grating to be fixed in stainless-steel tube.
Tube-packaged can be good at protection fiber grating not by external world, but directly sticks on capillary tubing inwall by epoxy resin due to grating, and adhesive layer in the middle of existing between the two, tackifier is easily aging, is not suitable for transformer oil.And this packing forms have employed steel pipe, bring hidden danger to the safe operation of transformer, be not also suitable in transformer oil the detection of dissolving hydrogen.
Summary of the invention
Technical matters to be solved by this invention, propose exactly to dissolve hydrogen sensing device in a kind of Anti-seismic transformer oil, it can meet in transformer oil the particular/special requirement of dissolving hydrogen and detecting well, reduction transformer itself vibrates and oil circulate the impact on sensor greatly, ensure the detection of dissolving hydrogen in oil simultaneously.
Solve the problems of the technologies described above, the technical solution used in the present invention is:
Hydrogen sensing device is dissolved in a kind of Anti-seismic transformer oil, comprise and be bonded in the suprabasil hydrogen sensitive film of cylindric Fiber Bragg Grating FBG by transition bed, it is characterized in that: on position, described cylindric Fiber Bragg Grating FBG substrate grid region, have the breach of a transverse direction, make the Fiber Bragg Grating FBG substrate cross section of indentation, there be English alphabet D shape; Described hydrogen sensitive film is bonded in the plane of described breach parallel substrate; Encapsulation is provided with outside the described Fiber Bragg Grating FBG substrate being bonded with hydrogen sensitive film, described encapsulating structure is: one end of cylindric Fiber Bragg Grating FBG substrate, encapsulation header is adopted to be fixed on one end of a polypropylene pipe sheath, the sensing position, grid region of Fiber Bragg Grating FBG substrate is single-ended to be encapsulated in polypropylene pipe sheath vacantly, and pipe jacket wall has some apertures.
On above-mentioned basic type, the present invention also has following various modifieds:
Described breach is, by rubbing down technique, the covering at the position, grid region of FBG is carried out rubbing down gained, and the plane of described breach parallel substrate is concave and convex plane, and described adhesion layer and hydrogen sensitive film are prepared on concave and convex plane by magnetron sputtering.
Described pipe sheath is nested multiple.
Install according to the direction of transformer oil flowing when described pipe sheath is installed, make free end as transformer oil outflow end.
Described encapsulation header material is epoxy resin.
Described transition bed is Kapton or titanium film.
The fibre-optical splice that described optical fiber is connected with light source or the demodulated methed equipment of outside is provided with optical fiber jacket to encapsulation header place.
Beneficial effect: advantage of the present invention is as follows:
1) stable chemical nature: resistance to chemical attack ability, can be placed in transformer oil for a long time, does not react with transformer oil, not easily aging.
2) temperature resistant capability is strong: higher temperature conditions when encapsulation sheath can tolerate the normal actual motion temperature of transformer and break down, indeformable under high temperature fault, and thermal ageing resistant performance is good.
3) insulating capacity is strong: encapsulation sheath has high rupturing capacity, directly can be placed in transformer, not affect the normal operation of transformer, can not bring potential safety hazard to transformer.
4) this encapsulation sheath effectively can weaken transformer vibration and transformer oil circulates impact on sensor, improves the physical strength of sensor.Thus improve reliability and the detection accuracy of sensor.
Accompanying drawing explanation
Fig. 1 is sensing device of the present invention composition structure cross-sectional schematic;
Fig. 2 is the close-up schematic view of Fig. 1;
Fig. 3 is the schematic perspective view of Fiber Bragg Grating FBG substrate;
Fig. 4 is the dosing technology process flow diagram of fixing encapsulation header.
Reference numeral in figure: 1-hydrogen gas sensor, 2-pipe, 3-aperture, 4-encapsulation header, 5-optical fiber jacket, 6-breach, the substrate of 7-Fiber Bragg Grating FBG, 8-hydrogen sensitive film.
Embodiment
See Fig. 1, Fig. 2 and Fig. 3, hydrogen sensing device embodiment is dissolved in Anti-seismic transformer oil of the present invention, comprise the hydrogen sensitive film 8-hydrogen gas sensor 1 be bonded in by transition bed in cylindric Fiber Bragg Grating FBG substrate 7, on position, Fiber Bragg Grating FBG substrate 7 grid region, have the breach 6 of a transverse direction, make the Fiber Bragg Grating FBG substrate cross section of indentation, there be English alphabet D shape, hydrogen sensitive film 8 is bonded on the concave and convex plane of breach parallel substrate.
Hydrogen gas sensor 1 is provided with encapsulation, its structure is: one end of cylindric Fiber Bragg Grating FBG substrate 7, epoxy encapsulation 4 is adopted to be fixed on one end of a pipe 2, the sensing position, grid region of Fiber Bragg Grating FBG substrate 7 is single-ended to be encapsulated in polypropylene pipe 2 sheath vacantly, pipe wall has some apertures 3; The fibre-optical splice that optical fiber is connected with light source or the demodulated methed equipment of outside is provided with optical fiber jacket 5 to encapsulation header place.
Fiber Bragg Grating FBG substrate grid region horizontal cut carries out rubbing down gained by the covering at the position, grid region of rubbing down technique FBG, and adhesion layer and hydrogen sensitive film are that to be prepared in projective table type by magnetron sputtering suprabasil, and transition bed is Kapton or titanium film.
Pipe also can be nested multiple, and device is installed according to the direction of transformer oil flowing when mounted, makes free end as oily outflow end.
Principle of work: hydrogen sensitive film volumetric expansion by decomposition absorption hydrogen molecule, thus stress is produced on hydrogen sensitive film, this stress coupling, on Fiber Bragg Grating FBG, utilizes the characteristic of Fiber Bragg Grating FBG counter stress sensitivity by this stress intensity by center wavelength variation quantitative response out.Thus achieve hydrogen concentration and be converted to differential expansion stress and then be converted to wavelength variable quantity, can judge to dissolve density of hydrogen in oil by the size of wavelength variable quantity.
Wherein, substrate adopts side-polished fiber Bragg grating, the covering at the position, grid region of FBG is carried out rubbing down by Side polishing fiber technology by side-polished fiber Bragg grating, and the FBG xsect after rubbing down is alphabetical D shape, so Side polishing fiber FBG is also called D shape FBG.
By only sputter on rubbing down face hydrogen sensitive film by thus hydrogen sensitive film is inhaled Bending Deformation that the transformation for stress after hydrogen is position, grid region, Side polishing fiber FBG is more responsive to Bending Deformation, adopts Side polishing fiber FBG effectively can improve the sensitivity of hydrogen gas sensor as substrate.But hydrogen sensitive film is inhaled hydrogen-expansion and is produced in grid region that Bending Deformation easily causes the breaking of hydrogen sensitive film, the situation such as come off simultaneously, although the sensitivity enhancement of sensor, the long-term reliability of this sensor declines.
In order to solve this problem, the present invention proposes boss shape side-polished fiber Bragg grating, its structure as shown in Figure 1, hydrogen sensitive film is bonded on the concave and convex plane of breach parallel substrate, owing to have employed not concordant projective table type structure, the out-of-flatness of substrate is more conducive to hydrogen sensitive film in suprabasil growth, adds the adhesion of hydrogen sensitive film and substrate, can effectively prevent coming off of hydrogen sensitive film.Meanwhile, this construction reduces the mutual extruding that on same plane, hydrogen sensitive film causes owing to inhaling hydrogen-expansion, thus reduce the cracked of hydrogen sensitive film, improve the long-term reliability of sensor.
The Main Function of transition bed connects the more weak hydrogen sensitive film of adhesion and substrate, stress is better coupled in substrate and also effectively prevents coming off of hydrogen sensitive film.The Main Function of hydrogen sensitive film is for absorbing hydrogen, and after inhaling hydrogen, hydrogen sensitive film will expand, thus the density of hydrogen dissolved in oil is converted into stress.
Because the material of optical fiber own is silicon dioxide, frangible and more very thin, to install at the scene and frangible easily broken in actual moving process, for install and actual motion brings inconvenience.And because strain and temperature all can make the parameter of wavelength change: stressed stretching can make mechanical periodicity, the waveguiding effect caused due to optical fiber elasto-optical effect and inside of optical fibre can make grating refractive index change simultaneously; Temperature variation can make the inner expanded by heating of grating and change screen periods, also can change the refractive index of temperature influence simultaneously.Can find out that the sensitivities to be measured such as fiber grating pair temperature, stress and strain, when the physical quantitys such as the temperature around grating, strain change, change causing the centre wavelength of fiber grating.And transformer exists vibration to a certain degree in actual motion, and transformer oil self is also circulating, and sensor is placed in inside transformer and will be vibrated and the change of stress that oil flow causes, thus detects hydrogen and cause interference.
Vibrating and the impact of oil circulation on sensor in transformer to weaken transformer in actual moving process, improving the physical strength of sensor, ensureing that sensor runs, for a long time accurately and reliably so be sensor design encapsulation.
Adopt the pipe of small volume, utilize encapsulation header that the sensing position, grid region of sensor is encapsulated in pipe inside.And carry out holing to ensure that sensor contacts with the direct of transformer oil on pipe surface.Be enclosed in by sensor in less volume, outside encapsulation sleeve pipe can effectively cushion because transformer vibration or transformer oil circulate the impulsive force caused, and sensor cannot significantly be bent.Thus effectively weaken vibration and transformer oil circulate to hydrogen detect interference, improve accuracy of detection.What encapsulate sheath adds the physical strength that improve sensor, improves the reliability of sensor.The structural drawing of hydrogen sensing device is dissolved as shown in Figure 2 in this Anti-seismic transformer oil.
The material selection polypropylene of this encapsulation header.The specific inductive capacity of transformer oil is about 2.25, and polyacrylic specific inductive capacity is in 2.2 ~ 2.6 scopes, and both specific inductive capacity are close, prevents from adding due to encapsulation header the harm of internal field's distortion to transformer caused.Polypropylene material absorbs water hardly, therefore insulating property are not by the impact of humidity, the dielectric coefficient that it is higher, be usually used in making electric insulation goods, voltage breakdown is also very high, is suitable for and makes electrical accessorie etc., reactance voltage, arc resistance are good, meet the insulation conditions of inside transformer.Polyacrylic chemical stability is fine, outside decapacitation is corroded by the concentrated sulphuric acid, red fuming nitric acid (RFNA), all more stable to other various chemical reagent, at room temperature almost do not make the solvent that it dissolves, only have aromatic hydrocarbons, the hydrocarbon of chlorination, it can be made softening swelling.Polypropylene absorbs water hardly, does not also react with transformer oil, is dipped in for a long time in transformer oil and can not accelerates its aging (transformer main body of oil is naphthenic hydrocarbon, aromatic hydrocarbon and alkane).Polypropylene has good thermotolerance, and goods temperature to carry out disinfection sterilizing more than 100 DEG C, and the upper strata oil temperature of oil-filled transformer is no more than 95 DEG C, and polypropylene can meet the temperature conditions in transformer.
Sensor is fixed in sheath by integrated encapsulation technology, and concrete technique is:
Dissolve the manufacture craft of hydrogen sensing device in above-mentioned Anti-seismic transformer oil, comprise sensing position, encapsulation header fixed fiber Bragg grating substrate grid region and be encapsulated in step in pipe sheath, its integrated encapsulation technology, it comprises following concrete steps:
One end of this encapsulation connecting fiber extension line is downward, adopt support to fix, and adopt in bottom the plug of customization to be blocked bottom, prevent liquid in potting process from flowing out;
Get a certain amount of A, B two component, by the certain density liquid of mixed preparing of weighing;
The embedding liquid of mixed preparing is slowly injected by the aperture closest to bottom, until epoxy resin injects about 5 ~ 10mm;
The sensor be placed on support is placed in vacuum tank, opens the vacuum environment in vacuum pump maintenance vacuum tank, to remove the bubble in embedding liquid, avoid because the bubble in embedding brings hidden danger to the long-term reliability of this encapsulation and the safe operation of transformer;
Its entirety is placed in vacuum temperature control box and carries out vacuum high-temperature solidification, arranging vacuum tank temperature is 80 DEG C, accelerates curing proceeding.Temperature-fall period after temperature ramp de and solidification complete all controls slowly to carry out by temperature, avoids the destruction of the encapsulating structure caused due to temperature Rapid Variable Design.
The dosing technology flow process of fixed seal head as shown in Figure 4.
Claims (7)
1. dissolve hydrogen sensing device in an Anti-seismic transformer oil, comprise and be bonded in the suprabasil hydrogen sensitive film of cylindric Fiber Bragg Grating FBG by transition bed, it is characterized in that: on position, described cylindric Fiber Bragg Grating FBG substrate grid region, have the breach of a transverse direction, make the Fiber Bragg Grating FBG substrate cross section of indentation, there be English alphabet D shape; Described hydrogen sensitive film is bonded in the plane of described breach parallel substrate; Encapsulation is provided with outside the described Fiber Bragg Grating FBG substrate being bonded with hydrogen sensitive film, described encapsulating structure is: one end of cylindric Fiber Bragg Grating FBG substrate, encapsulation header is adopted to be fixed on one end of a polypropylene pipe sheath, the sensing position, grid region of Fiber Bragg Grating FBG substrate is single-ended to be encapsulated in polypropylene pipe sheath vacantly, and pipe jacket wall has some apertures.
2. dissolve hydrogen sensing device in Anti-seismic transformer oil according to claim 1, it is characterized in that: described breach is, by rubbing down technique, the covering at the position, grid region of FBG is carried out rubbing down gained, the plane of described breach parallel substrate is concave and convex plane, and described adhesion layer and hydrogen sensitive film are prepared on concave and convex plane by magnetron sputtering.
3. dissolve hydrogen sensing device in Anti-seismic transformer oil according to claim 2, it is characterized in that: described pipe sheath is nested multiple.
4. dissolve hydrogen sensing device in Anti-seismic transformer oil according to claim 3, it is characterized in that: install according to the direction of transformer oil flowing when described pipe sheath is installed, make free end as transformer oil outflow end.
5. dissolve hydrogen sensing device in Anti-seismic transformer oil according to claim 4, it is characterized in that: described encapsulation header material is epoxy resin.
6. dissolve hydrogen sensing device in Anti-seismic transformer oil according to claim 5, it is characterized in that: described transition bed is Kapton or titanium film.
7. dissolve hydrogen sensing device in Anti-seismic transformer oil according to claim 6, it is characterized in that: the fibre-optical splice that described optical fiber is connected with light source or the demodulated methed equipment of outside is provided with optical fiber jacket to encapsulation header place.
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| CN201510696037.7A CN105136678A (en) | 2015-10-21 | 2015-10-21 | Sensing device for hydrogen dissolved in anti-seismic type transformer oil |
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| CN201510696037.7A CN105136678A (en) | 2015-10-21 | 2015-10-21 | Sensing device for hydrogen dissolved in anti-seismic type transformer oil |
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| CN113406016A (en) * | 2021-06-15 | 2021-09-17 | 江西师范大学 | FBG-based monitoring device and monitoring method for gas quality of pressure steam sterilizer |
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