CN104819880B - A kind of transformer oil air separation based on Hollow-Core Photonic Crystal Fibers - Google Patents
A kind of transformer oil air separation based on Hollow-Core Photonic Crystal Fibers Download PDFInfo
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Abstract
The invention discloses belong to a kind of transformer oil air separation based on Hollow-Core Photonic Crystal Fibers of mixed gas separation and detection technique scope in Gases Dissolved in Transformer Oil oil.The device is connected to the both ends of Hollow-Core Photonic Crystal Fibers by the solid plain optical fiber of either close single mode identical with Hollow-Core Photonic Crystal Fibers diameter or multimode, forms low damage ground constraint optic path path；A round is bored vertically in the surface of Hollow-Core Photonic Crystal Fibers, and the air chamber of failure gas is made up of single hollow photonic crystal fiber, significantly reduce chamber volume, interplantation is enabled the sensor in transformer, is attached in one connection end of Hollow-Core Photonic Crystal Fibers and solid core fibres using directly fused；Another connection end carries out mechanical registeration using inorganic ceramic pipe sleeve outside solid plain optical fiber and Hollow-Core Photonic Crystal Fibers junction；The present invention realizes hollow photon crystal surface drilling technology and junction inorganic thin film permeability and separation technology, improves the efficiency of Oil-gas Separation.
Description
Technical field
The invention belongs to mixed gas separation and detection technique scope, more particularly to one in Gases Dissolved in Transformer Oil oil
Transformer oil air separation of the kind based on Hollow-Core Photonic Crystal Fibers.
Background technology
Detection and analysis to Gas in Oil of Transformer are the important monitoring means judged running state of transformer, are become
Caused internal fault, such as hot-spot, electric discharge, insulating paper aging can all cause absolutely depressor for various reasons in operation
Edge deteriorates and produces a certain amount of gas and is dissolved in oil, and different failures causes gas component caused by oil decomposition also not to the utmost
It is identical, so as to judge the internal fault of transformer or latency event by analyzing the species and content of oil dissolved gas component
Barrier.On-line monitoring method is used to Gases Dissolved in Transformer Oil, the major conditions of transformer can be reflected exactly, make custodian
Member can grasp the running status that each station owner becomes at any time, to make decisions in time, the generation prevented accident.Dissolved in transformer oil
The key technology of gas on-line monitoring includes Oil-gas Separation technology, mixed gas detection technique.
At present, both at home and abroad all without the technology for directly detecting Dissolved Gas Content in Transformer Oil, either it is offline still
On-line checking, it is necessary to will deviate from as caused by failure from transformer oil gas, then measure, event is deviate from from transformer oil
Barrier characteristic gas is quick detection, the key and prerequisite accurately measured.
The degassing method of offline inspection mainly uses dissolution equilibrium method (mechanical oscillation method) and vacuum method (reducing piston pump
De- method entirely).There is the problems such as complicated, operating performance is various, the holding of dynamic air-tightness is poor in both approaches, it is difficult to realize and exist
Line.The method of online Oil-gas Separation mainly has film/capillary air permeability method, vacuum outgas method, Dynamic headspace degassing method at present
And the methods of haemodialysis equipment.
1. film/capillary air permeability method, some polymer thin films, which have, only allows gas permeation without the property that allows liquid to pass through,
It is suitable for that in the case of continuous monitoring, dissolved gas is deviate from from transformer insulation oil.In the entrance of air chamber, height is mounted with
Molecular film, the side of film is transformer oil, and opposite side is air chamber.The gas permeable film dissolved in oil automatically penetrates into another
In the air chamber of side.Meanwhile past free gas is permeated and can be also redissolved in through film in oil.In certain temperature
Under, (it is generally necessary to by tens hours) can reach dynamic equilibrium after certain time.When reaching balance, given in air chamber
The content of certain gas keeps constant and this gas to being dissolved in oil content directly proportional.It can be drawn by calculating molten
Certain gas content of solution in oil.The shortcomings that this method is that degassing rate is slow, is not suitable for using in a portable device
Carry out quick in-site measurement.In addition, the impurity and dirt that contain in oil inevitably make film gradually block, thus need
Often to change film.Generally breathed freely both at home and abroad from poly tetrafluoroethylene as what oil dissolved gas was monitored on-line at present
Film, conventional poly tetrafluoroethylene permeate 6 kinds of gas (H2、CO、CH4、C2H2、C2H4、C2H6) need 100h.Hitachi, Ltd uses PFA
Film, also known as tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, PFA films are preferable to 6 kinds of gas permeabilities, permeate 6 kinds of gases
It is 80h the time required to component.Shanghai Communications University uses the poly tetrafluoroethylene with micropore, optimal thickness 0.18mm, optimum aperture
For 8~10 μm, permeability is better than PFA films, is 24h the time required to permeating 6 kinds of gas components.Canadian Morgan
Schaffer companies are restrained using polytetrafluoroethylene (PTFE) nylon, are 4h the time required to permeating 6 kinds of gas components.Hydren companies use
Polytetrafluoroethylene (PTFE) and fluorinated ethylene-propylene are dilute.
2. vacuum outgas method, vacuum outgas method includes ripple tube method and vavuum pump degassing method.
Ripple tube method is to drive bellows Repeated Compression using motor, repeatedly vacuumizes, oil dissolved gas is extracted out.
Mitsubishi Co., Ltd. is exactly to develop a kind of Gases Dissolved in Transformer Oil on-Line Monitor Device using ripple tube method.
Vavuum pump degassing method is de-gassed using the vacuum outgas principle applied in conventional chromatography evaluation.Divide instrument in Henan
The chromatogram monitoring instrument that device is released deviates from gas by the way of purge ＆ trap, and degassing rate is more than 97%.
3. Dynamic headspace degassing method, during degassing, the stirrer in sampling bottle ceaselessly rotates this method, agitation
Oil sample deaerates；The gas of precipitation is returned after detection means in the oil sample of sampling bottle.In this process, interval measurement gas sample
Concentration, when the value of fore-and-aft survey is consistent, it is believed that degassing finish.This method degassing efficiency is between film breathable and vacuum outgas
Between, repeatability preferably, there is at a relatively high measurement uniformity.Therefore, gradually recognized and widely used.
4. the shortcomings that prior art, the oil and gas separation method currently mainly used is mainly that polymer matrix, vacuum take off
Gas and three kinds of methods of head space degassing, the shortcomings that this several method has oneself, are in particular in：
1. for existing polymer matrix, the either on-line monitoring of monitoring single-component gas or full constituent gas
System is required for separating failure gas in oil using pellicle, and at least needs the time of 1-2 days just to make to bring about the desired sensation
Indoor gas reaches balance with oil dissolved gas, and the time is very long, still can not realize the on-line monitoring in complete meaning.
2. vacuum outgas method and head space degassing method are required to carry out mechanical treatment to oil sample, it is necessary to by oil sample using mechanical pump
It is drawn out to outside transformer cavity, although Oil-gas Separation can be realized quickly, complicated in mechanical structure is, it is necessary to extra oil gas
Lock out operation, long-term reliability is not high, is unfavorable for the on-line monitoring of transformer.
The content of the invention
The purpose of the present invention is to propose to gas and oil separating plant in a kind of transformer oil based on Hollow-Core Photonic Crystal Fibers, its
It is characterised by, the device, as air chamber, is significantly reduced chamber volume, enable the sensor to interplantation using Hollow-Core Photonic Crystal Fibers
In transformer；Wherein, a round is bored on the surface of Hollow-Core Photonic Crystal Fibers vertically；And by single hollow photonic crystal light
Fibre forms the air chamber of failure gas, as the place for completing gaseous spectrum absorption process；By with Hollow-Core Photonic Crystal Fibers diameter
Identical either close single mode or the solid plain optical fiber of multimode are connected to the both ends of Hollow-Core Photonic Crystal Fibers, form low damage
Ground constraint optic path path；Connected in a connection end of Hollow-Core Photonic Crystal Fibers and solid core fibres using directly fused
Connect；Another connection end is carried out using inorganic ceramic pipe sleeve outside solid plain optical fiber and Hollow-Core Photonic Crystal Fibers junction
Mechanical registeration；Hollow photon crystal surface drilling technology and junction inorganic thin film permeability and separation technology are realized, improves oil gas
The efficiency of separation, reduce the time needed for Oil-gas Separation.
It is described it is directly fused be that single-mode fiber and Hollow-Core Photonic Crystal Fibers are subjected to welding, splice loss, splice attenuation using heat sealing machine
Not higher than 3dB.
The mechanical registeration is that solid plain optical fiber and Hollow-Core Photonic Crystal Fibers junction are entered using inorganic ceramic pipe
Row alignment, ensure that transmission loss is not higher than 5dB.
The surface of the Hollow-Core Photonic Crystal Fibers, which carries out drilling, to be entered using femto-second laser or excimer laser
Capable.
It is along same on Hollow-Core Photonic Crystal Fibers that a round is bored on the surface of the Hollow-Core Photonic Crystal Fibers vertically
The direction of bar straight line is drilled, and the hole of same root Hollow-Core Photonic Crystal Fibers is equidistantly arranged in Hollow-Core Photonic Crystal Fibers table
Face, the pitch-row between two neighboring hole are not less than 0.5cm, and the diameter in each hole is not higher than 200nm；Wherein, the depth in hole need to reach
To being 63 ± 1 μm without coat thickness, coherent inlet channel should be formed, Hollow-Core Photonic Crystal Fibers can not be punched again,
The transmission of the toughness and light path entered without influenceing optical fiber.
Light intensity is not less than 90% in the central hollow region of the Hollow-Core Photonic Crystal Fibers.
Described inorganic ceramic junction with optical fiber encapsulate without gel using glass solder：Earthenware connection used
0.1~1MPa of pressure-bearing and gas leakage oil leak can not occur for end.
Beneficial aspects of the present invention are to propose gas and oil separating plant in a kind of transformer oil based on Hollow-Core Photonic Crystal Fibers,
Overcome long equilibration time present in existing Oil-gas Separation means, isolating construction complexity, be not easy to the defects of built-in, meet electricity
The particular/special requirement of power inside transformer oil dissolved gas on-line real time monitoring.Specifically, in the present invention, hollow photon crystal
Optical fiber is used as air chamber in itself, can significantly reduce chamber volume, makes sensor abundant with transformer oil with interplantation in transformer
Contact, Oil-gas Separation process are simplified, and can reduce the gas response time, light path is longer, can effectively improve the precision of measurement.
In addition, inorganic ceramic pipe used is used for the mechanical support of light path, ceramic membrane is also beneficial to realize online real-time monitoring；Film
It is ventilative, it is ensured that the transmitting of light path, detection and to promote gas balance, osmotic effect.Compared to organic high molecular layer, inoranic membrane
Have the advantages that good high temperature resistant, resistance to microorganism, chemical stability, high mechanical strength, easy cleaning regeneration and pore-size distribution are concentrated；By
Monitored in using optical gas, can continuous several times gas is measured, it is not necessary to carrier gas and gas, do not consume molten in oil
Solve gas；Therefore the present invention has the advantages that real-time is good, reliability is high, non-calibrating, to exempt from carrier gas, measurement accuracy high.
Brief description of the drawings
Fig. 1 is gas and oil separating plant structural representation in the transformer oil based on Hollow-Core Photonic Crystal Fibers.
Fig. 2 is Hollow-Core Photonic Crystal Fibers drilling arrangement schematic diagram.
Fig. 3 is inorganic ceramic pipe connecting structure schematic diagram.
Fig. 4 is junction enlarged diagram.
Embodiment
The present invention proposes gas and oil separating plant in the transformer oil based on Hollow-Core Photonic Crystal Fibers：The device is using hollow
Photonic crystal fiber significantly reduces chamber volume, enables the sensor to interplantation in transformer as air chamber；
The global design from device and key link are described in detail below：
(1) design of gas and oil separating plant
Oil gas device in transformer oil based on Hollow-Core Photonic Crystal Fibers and inorganic ceramic material proposed by the invention,
Overall structure diagram is as shown in figure 1, by either close single mode identical with Hollow-Core Photonic Crystal Fibers diameter or multimode
Solid plain optical fiber SMF is connected to Hollow-Core Photonic Crystal Fibers HC-PCF both ends, forms low damage ground constraint optic path path；
Micro Process is carried out to Hollow-Core Photonic Crystal Fibers using femto-second laser in Hollow-Core Photonic Crystal Fibers and solid core fibres junction
Mode carries out directly fused connection；And using inorganic ceramic pipe sleeve in solid plain optical fiber and Hollow-Core Photonic Crystal Fibers junction
Outside carries out mechanical registeration (as shown in Figure 3)；Ensure that transmission loss is not higher than 5dB；Realize hollow photon crystal surface drilling
Technology and junction inorganic thin film permeability and separation technology, the efficiency of Oil-gas Separation is improved, reduce the time needed for Oil-gas Separation.
In Fig. 1, a round is bored on the surface of Hollow-Core Photonic Crystal Fibers vertically；And by single hollow photonic crystal fiber
The air chamber of failure gas is formed, as the place for completing gaseous spectrum absorption process；Mainly it is made up of three units：1. hollow light
Photonic crystal fiber (Hollow Core Photonic Crystal Fibers, HC-PCF), by the lossless hollow light of single entirety
Photonic crystal fiber is formed, and as the air chamber of failure gas, completes the place that gaseous spectrum absorbs；2. solid plain optical fiber, connection
In the both ends of Hollow-Core Photonic Crystal Fibers, by the single mode (Single identical or close with Hollow-Core Photonic Crystal Fibers diameter
Mode Fiber, SMF) or multimode (Multiple Mode Fiber, MMF) optical fiber composition, low damage ground constraint optic path road
Footpath；Wherein, inorganic ceramic pipe mechanical support mode and solid plain optical fiber are used in the 1# connection ends of Hollow-Core Photonic Crystal Fibers
Connection；Directly single-mode fiber and Hollow-Core Photonic Crystal Fibers are entered using heat sealing machine in the 2# connection ends of Hollow-Core Photonic Crystal Fibers
Row welding, splice loss, splice attenuation must not be higher than 3dB.
Fig. 2 is Hollow-Core Photonic Crystal Fibers drilling arrangement schematic diagram.In view of Oil-gas Separation and the needs of air inlet, set
Meter：In the surface drilling of Hollow-Core Photonic Crystal Fibers, the separation of oil gas is realized, selects suitable aperture, to prevent transformer oil
In the macromolecular such as alkane, cycloalkane and fragrant unsaturated hydrocarbons enter inside of optical fibre；Hollow photon crystal is arranged in three-dimensional
On workbench, the relative position of Hollow-Core Photonic Crystal Fibers is fixed, Hollow-Core Photonic Crystal Fibers are entered using femto-second laser
Row micro-processing method drills to the direction along same straight line on Hollow-Core Photonic Crystal Fibers, between two neighboring hole
Pitch-row is not less than 0.5cm, and the diameter in each hole is not higher than 200nm.Equidistantly arrange in the hole of same root Hollow-Core Photonic Crystal Fibers.
In boring procedure, the focal area and laser energy value of drilling need to be regulated, the depth in each hole need to reach 63 ± 1 μm
(being free of coat thickness), should form coherent inlet channel, can not punch Hollow-Core Photonic Crystal Fibers again and then influence light
The transmission of fine toughness and light path.Femtosecond laser has " cold " processing, energy expenditure is low, damage is small, the degree of accuracy is high, three dimensions
The advantages of upper strict positioning, the micro-machined particular/special requirement of optical fiber is met to greatest extent；To existing hollow photon crystal light
After fibre carries out micro Process and transformation, still need to ensure the hollow core area that most Light Energy concentrates on optical fiber, light wave is still limited
Make and propagated in the fiber cores area of low-refraction.After surface drilling, the light intensity not less than 90% is in Hollow-Core Photonic Crystal Fibers
Between propagated in hollow area rather than in covering, after gaseous sample is filled with hollow core area, gas fully can connect with light field
Touch, so as to produce stronger absorption to light field；Gas sample chambers of the HC-PCF as high-efficiency compact in gas sensing system,
The gaseous sample can of minimum volume is only needed to realize that trace gas senses.
Fig. 4 show inorganic ceramic pipe connecting structure schematic diagram.Mechanical connection machine is installed additional in the 1# connection ends shown in Fig. 1
Structure, and be aided with inorganic ceramic film and improve the speed that gas infiltrates through Hollow-Core Photonic Crystal Fibers, ensure air inlet effect.Fig. 3 is
Realize that solid single-mode fiber is connected with Hollow-Core Photonic Crystal Fibers light path and aids in the structure of Oil-gas Separation using inorganic ceramic pipe
Schematic diagram.Earthenware is processed using integration, alphabetical A places expression optical fiber cutting ferrule coupling part, respectively with divesting the list of coat
Mode fiber and Hollow-Core Photonic Crystal Fibers mechanically connect, and are carried out using glass solder without gel relieved package, avoid gas leakage or
Side air inlet etc..On the basis of connection end mechanical performance is ensured, represent to be relatively thin ceramic membrane at letter b, in ceramics
Film both sides, the gas dissolved in transformer oil can be penetrated into inside connection end by ceramic membrane, and then is diffused to hollow
The central hollow region of photonic crystal fiber.Earthenware connection end used can 0.1~1MPa of pressure-bearing and do not occur gas leakage leakage
Oil, the fibre core offset of solid single-mode fiber and Hollow-Core Photonic Crystal Fibers are no more than 0.1 μm (as shown in Figure 4), two kinds of optical fiber
Between spacing be not more than 5mm, the thickness of ceramic membrane is not higher than 50 μm, and the molecule maximum gauge of infiltration is not higher than 100nm.
Currently employed relatively broad polymeric membrane includes perfluoroethylene-propylene film (FEP), polytetrafluoroethylene capillary film
(GP100), hollow fiber composite membrane and the poly tetrafluoroethylene with micropore etc., then such polymeric membrane generally existing some
Shortcoming, such as gas permeability be not high, monitoring response time length, and the gas and oil equilibration time is often even several up to more than ten hour
Ten hours, the Practical Project requirement of on-line monitoring can not be met.Compared with organic high molecular layer, inoranic membrane have high temperature resistant,
The advantages that resistance to microorganism, chemical stability are good, high mechanical strength, easy cleaning regenerate and pore-size distribution is concentrated, and in food, medicine
The liquid separation field such as thing is promoted the use of, wherein comparing typically ceramic membrane.Unlike conventional organic thin film, this
Kind microporous membrane utilizes " fluid separation " process of cross-flow filtration form.When transformer oil flow at high speed in membrane tube, film
Outer pipe is the small-sized air chamber isolated, and what ceramic membrane section was presented is the densely covered micropore of multichannel tubulose structural tube wall.
Claims (4)
1. gas and oil separating plant in a kind of transformer oil based on Hollow-Core Photonic Crystal Fibers, it is characterised in that the device uses
Hollow-Core Photonic Crystal Fibers significantly reduce chamber volume, enable the sensor to interplantation in transformer as air chamber；Wherein, it is empty
A round is bored vertically in the surface of heart photonic crystal fiber；And the gas of failure gas is made up of single hollow photonic crystal fiber
Room, as the place for completing gaseous spectrum absorption process；By the single mode identical or close with Hollow-Core Photonic Crystal Fibers diameter
Or the solid plain optical fiber of multimode is connected to the both ends of Hollow-Core Photonic Crystal Fibers, low damage ground constraint optic path road is formed
Footpath；It is attached in a connection end of Hollow-Core Photonic Crystal Fibers and solid core fibres using directly fused, splice loss, splice attenuation is not high
In 3dB；Another connection end is using inorganic ceramic pipe sleeve outside solid plain optical fiber and Hollow-Core Photonic Crystal Fibers junction
Carry out mechanical registeration；Hollow photon crystal surface drilling technology and junction inorganic thin film permeability and separation technology are realized, is improved
The efficiency of Oil-gas Separation, reduce the time needed for Oil-gas Separation；A row is bored vertically in the surface of the Hollow-Core Photonic Crystal Fibers
Hole is drilled along the direction of same straight line on Hollow-Core Photonic Crystal Fibers, the hole of same root Hollow-Core Photonic Crystal Fibers
Equidistantly it is arranged in Hollow-Core Photonic Crystal Fibers surface, the pitch-row between two neighboring hole is not less than 0.5cm, the diameter in each hole
Not higher than 200nm；Wherein, it is 63 ± 1 μm that the depth in hole, which need to reach without coat thickness, should form coherent air inlet and lead to
Road, Hollow-Core Photonic Crystal Fibers can not be punched again, the transmission of the toughness and light path entered without influenceing optical fiber.
2. gas and oil separating plant in the transformer oil based on Hollow-Core Photonic Crystal Fibers, its feature exist according to claim 1
It is solid plain optical fiber and Hollow-Core Photonic Crystal Fibers junction to be carried out using inorganic ceramic pipe pair in, the mechanical registeration
Standard, ensure that transmission loss is not higher than 5dB.
3. gas and oil separating plant in the transformer oil based on Hollow-Core Photonic Crystal Fibers, its feature exist according to claim 1
In light intensity is not less than 90% in the central hollow region of the Hollow-Core Photonic Crystal Fibers.
4. gas and oil separating plant in the transformer oil based on Hollow-Core Photonic Crystal Fibers, its feature exist according to claim 1
In inorganic ceramic junction with optical fiber encapsulate without gel using glass solder：Earthenware connection end used being capable of pressure-bearing
0.1~1MPa and gas leakage oil leak does not occur.
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