CN204087848U - There is the large generator stator bar solid strand of temp sensing function - Google Patents
There is the large generator stator bar solid strand of temp sensing function Download PDFInfo
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- CN204087848U CN204087848U CN201420635702.2U CN201420635702U CN204087848U CN 204087848 U CN204087848 U CN 204087848U CN 201420635702 U CN201420635702 U CN 201420635702U CN 204087848 U CN204087848 U CN 204087848U
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Abstract
Have the large generator stator bar solid strand of temp sensing function, the utility model relates to a kind of large generator stator bar solid strand with temp sensing function.The purpose of this utility model is to solve the not accurate enough problem of temperature value that existing temperature sensor records; And the problem of the embedding very difficult realization of existing temperature sensor.A kind of large generator stator bar solid strand with temp sensing function, described solid strand comprises copper strand wire main body (1), it is characterized in that, described solid strand also comprises optical fiber (2), (1) through hole (1-1) is provided with along its length, optical fiber (2) is implanted in described through hole (1-1), described optical fiber (2) is serially connected with multiple fiber-optical grating temperature sensor FBG1, FBG2, FBGn, be coated with polyimide coating, the all not identical and dynamic range non-overlapping copies of wavelength change of centre wavelength, between distance be 25 ~ 30cm.The utility model is used for the thermometric of large generator stator bar solid strand.
Description
Technical field
The utility model relates to a kind of large generator stator bar solid strand with temp sensing function.
Background technology
The working temperature of high-rating generator (abbreviation heavy motor) stator bar is the key index in relation heavy motor security of operation and life-span.High-rating generator refers to that power is greater than the generator of 100MW, if directly can record the Temperature Distribution of line rod conductor when heavy motor runs, to the safe operation of monitoring heavy motor, and regulation and control optimum Working, and it is all very helpful to extract State Maintenance information.
Due to the high temperature of heavy motor inside, high pressure and strong electromagnetic environment, and the special structure of stator bar itself and manufacturing process, the temperature value causing traditional temperature sensor to record is not accurate enough; The embedding of temperature sensor is difficult to realize.
Utility model content
The object of the invention is to solve the not accurate enough problem of temperature value that existing temperature sensor records; And the problem of the embedding very difficult realization of existing temperature sensor, and propose the large generator stator bar solid strand with temp sensing function.
A kind of large generator stator bar solid strand with temp sensing function, described solid strand comprises copper strand wire main body, it is characterized in that, described solid strand also comprises optical fiber, copper strand wire main body is provided with through hole along its length, the cross-section center of described through hole overlaps with the cross-section center of copper strand wire main body, in through hole described in embedded fibers, described optical fiber is serially connected with multiple fiber-optical grating temperature sensor FBG1, FBG2, FBGn, the grid region of each fiber-optical grating temperature sensor is coated with polyimide coating, the all not identical and dynamic range non-overlapping copies of wavelength change of the centre wavelength of each fiber-optical grating temperature sensor, distance often between adjacent two fiber-optical grating temperature sensors is 25 ~ 30cm
The temperature of the utility model to existing measurement large generator stator bar solid strand is developed, and improves the method for the temperature measuring large generator stator bar solid strand in the past.Adopt the large generator stator bar solid strand with temp sensing function of the utility model design, optical fiber is serially connected with multiple fiber-optical grating temperature sensor FBG1, FBG2, FBGn, the grid region of each fiber-optical grating temperature sensor is coated with polyimide coating, make the easily embedding of temperature sensor, the all not identical and dynamic range non-overlapping copies of wavelength change of the centre wavelength of each fiber-optical grating temperature sensor, just can measure the temperature of diverse location, accurately can record temperature value, higher by 6% than existing method of measurement precision, reliably reflect the actual operating state of stator bar.
Fig. 7 gives the wavelength temperature curve of 3 the FBG temperature sensors implanted in stator bar, and the initial wavelength of 3 FBG is respectively 1527.934nm, 1532.164nm, 1539.918nm, is numbered FBG-A respectively, FBG-B, FBG-C.The wavelength temperature linearity of 3 FBG is all better as can be seen from Figure 7, and the linearly dependent coefficient of corresponding wavelength temperature fitting a straight line is respectively 0.99912,0.99955,0.99966.
Accompanying drawing explanation
Fig. 1 is stator bar sectional view;
Fig. 2 is the system construction drawing that FBG implants the end of copper strand wire main body 1, and FBG is fiber-optical grating temperature sensor;
Fig. 3 is the system construction drawing that FBG implants the center circular groove of copper strand wire main body 1;
Fig. 4 is the system construction drawing of the specific embodiment of the invention four;
Fig. 5 is the thermometric copper strand wire figure of the specific embodiment of the invention one;
Fig. 6 is thermometric copper strand wire position selection figure;
Fig. 7 is the wavelength temperature curve chart implanting stator bar fiber-optical grating temperature sensor.
Embodiment
Embodiment one: composition graphs 5 illustrates present embodiment, a kind of large generator stator bar solid strand with temp sensing function, described solid strand comprises copper strand wire main body 1, it is characterized in that, described solid strand also comprises optical fiber 2, copper strand wire main body 1 is provided with through hole 1-1 along its length, the cross-section center of described through hole 1-1 overlaps with the cross-section center of copper strand wire main body 1, optical fiber 2 is implanted in described through hole 1-1, described optical fiber 2 is serially connected with multiple fiber-optical grating temperature sensor FBG1, FBG2, FBGn, the grid region of each fiber-optical grating temperature sensor is coated with polyimide coating, the all not identical and dynamic range non-overlapping copies of wavelength change of the centre wavelength of each fiber-optical grating temperature sensor, distance often between adjacent two fiber-optical grating temperature sensors is 25 ~ 30cm.
Embodiment two: present embodiment and embodiment one unlike: it is characterized in that, the centre wavelength of each fiber-optical grating temperature sensor described is 1520nm ~ 1560nm.
Other parameter is identical with embodiment one.
Embodiment three: present embodiment and embodiment one or two unlike: it is characterized in that: the diameter of described through hole 1-1 is 0.5mm.
Other parameter is identical with embodiment one.
Embodiment four: composition graphs 4 illustrates present embodiment, present embodiment and embodiment one, two or three unlike: it is characterized in that: described copper strand wire main body 1 cross section is round rectangle, round rectangle radius is 0.65mm, and long is 14mm, and wide is 2.12mm.
Other parameter is identical with embodiment one.
Embodiment five: present embodiment and embodiment one, two, three or four unlike: it is characterized in that: described distance often between adjacent two fiber-optical grating temperature sensors is 27cm.
Other parameter is identical with embodiment one.
Embodiment six: present embodiment and embodiment one, two, three, four or five unlike: it is characterized in that: the centre wavelength of each fiber-optical grating temperature sensor described is 1540nm.
Other parameter is identical with embodiment one.
Embodiment seven: composition graphs 2 illustrates present embodiment, a kind of another program with the large generator stator bar solid strand of temp sensing function be FBG through external diameter 2.0mm, the thin copper pipe encapsulation of internal diameter 0.5mm is placed on each solid strand 3 end.
The loss of this execution mode copper cross section is maximum; The thin copper pipe of FBG temperature sensor need be encapsulated (selecting the reason of copper pipe to be loss in order to reduce copper cross section), otherwise be easy to fracture in the online excellent course of processing;
Embodiment eight: composition graphs 3 illustrates present embodiment, a kind of another program with the large generator stator bar solid strand of temp sensing function is that a solid strand 3 is opened at center the circular groove that a diameter is 1.5mm, FBG is through external diameter 1.5mm, the thin copper pipe encapsulation of internal diameter 0.5mm is placed on solid strand 3 center, and diameter is in the circular groove of 1.5mm.
This execution mode copper section ratio embodiment seven is lost little, but loses greatly than embodiment one; All need the thin copper pipe of FBG temperature sensor to encapsulate (selecting the reason of copper pipe to be loss in order to reduce copper cross section), otherwise be easy to fracture in the online excellent course of processing;
The method of this patent embodiment one encapsulates without the need to copper tubule.Embodiment one, embodiment seven and embodiment eight mounting means all need customization or make special thermometric copper strand wire, can customize special strand with strand provider, can't the effect string rod course of processing to motor manufacturing enterprise.Through the implantation that more specific execution mode one is the application of easier through engineering approaches.
Manufacturing process and the operation principle with the large generator stator bar solid strand of temp sensing function are:
1. composition graphs 1 is for the stator bar of 300MW turbo generator, comprising: hollow-section strand 1, main insulation 2, solid strand 3, strand insulation 4, equipotential layer 5, bar insulation 6, transposition insulation 7; Its cross section as shown in Figure 1.The wide 14mm of solid strand, thick 2.12mm, amount to 32 strands, adopts viscosity double glass fiber band enamel-cover.Hollow-section strand is bare copper wire, totally 2 strands.32 solid strands are a row with 16, are arranged in two layers, and be lined with many glue expoxy glass micarex insulating trip between two row's strands, thickness is 0.5mm.Two hollow-section strands are positioned at both sides, are the passage of coolant.Main insulation adopts 5438-IT epoxy mica tape (0.14mm × 25mm) over the ground, and partly change bag 28 layers, monolateral thickness 6mm.Line stick end shape is involute shape, and becomes as a whole through curing mold pressing technique.
Heavy motor stator bar conductor forms primarily of solid strand, and its temperature is the maximum temperature point of heavy motor stator bar when normally running, be also heavy motor when running user wish the temperature of monitoring most.Therefore temperature sensor is implanted the operating temperature of the heavy motor stator bar conductor can directly surveyed in solid strand.
2. the painting method of fiber-optical grating temperature sensor FBG
The operating temperature range of ordinary optic fibre (as healthy and free from worry SMF-28) is-60 ~+85 DEG C.Optical fiber Long-term service temperature through ultra-violet curing acrylate coatings is-65 ~+150 DEG C, and short-term can work at 200 DEG C.For the high-rating generator of the highest class of insulation, then need to adopt special high-temperature resistant optical fiber and grating.Its Transmission Fibers part adopts polyimide coating, and coating is not with in grid region.Long-term service temperature scope is-65 ~+300 DEG C, and short-term can work at 350 DEG C, can long-term work under the highest class of insulation limiting temperature.
Limiting by FBG manufacturing process, first need divest the coat of ultraviolet radiation zone optical fiber when making grating.For the high-temperature resistant optical fiber of polyimide coating, the grid region after grid is become to be similarly naked grid.Polyimide coating technique is comparatively complicated, and applies uneven meeting and cause grating spectrum degradation, and even can not use, therefore, the grid region of the high temperature resistant grating that market is sold is all uncoated.Naked FBG so is in use easy to fracture, and high temperature resistant FBG is expensive, can cause larger loss.FBG is fiber-optical grating temperature sensor.
The material polyimides identical with optical fiber coating is adopted to apply grid region.Polyimides has a series of extraordinary performance, under-200 ~ 260 DEG C of high/low temperature, particularly has outstanding mechanical property, electrical insulation capability, anti-wear performance and difficult volatile performance under a high vacuum, also have good chemical stability and adhesive property etc.Its maximum advantage has higher thermal stability than general polymer.Therefore, polyimides is a kind of proper encapsulating material.
1) experiment material preparation
Polypyromelliticimide is that pyromellitic acid anhydride or its carboxylate derivatives and various diamines obtain through polycondensation reaction, and its method for making has melt polycondensation and two-step synthesis method.Have employed two step synthesis, pyromellitic acid anhydride and aromatic diamine are made soluble polyamide acid in suitable organic solvent, then form polyimide film or paint film with heating imidization.Raw materials comprises: 4,4 '-diaminodiphenyl ether, DMA, pyromellitic acid anhydride etc.
By 4,4 '-diaminodiphenyl ether is dissolved in a certain amount of DMA, stirs after making it dissolve completely, pyromellitic acid anhydride is added in a small amount of repeatedly mode in this solution, along with reaction is carried out, solution viscosity is increasing, when the pyromellitic acid anhydride mole and 4 added, when 4 '-diaminodiphenyl ether is suitable, the viscosity of solution can increase to and occur pole-climbing phenomenon, illustrates that the molecular weight of polyamic acid has reached desirable requirement of experiment, now stops adding pyromellitic acid anhydride; Pole-climbing adds the levelling agent of mass fraction 1% after 1 hour, continue to stir certain hour, makes it fully react, to obtain the polyamic acid solution of HMW; React after about 16 hours, filter glue, bubble of bleeding, prepares coating.
2) painting method:
(1) first before baking oven is preheated to 80 DEG C, object be can fast to be moistened with polyamic acid solution FBG heating, prevent the polyamic acid solution being attached to FBG surface from all trickling before curing;
(2) FBG is brushed certain thickness polyamic acid solution;
(3) FBG brushing polyamic acid solution is hung in baking oven and heat 4 ~ 5 minutes; Afterwards oven temperature is elevated to and heats 4 ~ 5 minutes again to when 100 DEG C; Then be warming up to 140 DEG C, heat 8 ~ 9 minutes.Polyimide film bubbling after the employing stage, intensification can prevent the too fast evaporation of the solvent in polyamic acid solution from making imidization;
(4) be warming up to 180 DEG C, heat 30 minutes, polyimides is fully solidified;
(5) allow baking oven fully cool, take out the coated FBG after imidization.After arriving heating time, the FBG that at once will solidify takes out, because quenching can cause the fiber grating after applying to produce larger bending.
3. the making of copper strand wire main body 1
Owing to adopting wavelength-division multiplex technique, fiber grating can realize the monitoring of stator bar Temperature Distribution.An optical fiber can carve multiple FBG.The centre wavelength of the FBG that simple optical fiber is connected is all not identical, and dynamic range non-overlapping copies.By the grid region of each FBG method described in 2, coating one deck polyimides, had both added mechanical strength and the temperature control of FBG array of temperature sensor, had turn improved resistance to elevated temperatures.
The above-mentioned high-temperature resistant optical fiber grating temperature sensor array made is penetrated in the special copper strand wire of customization described in 1, then use one end of epoxy resin shutoff copper strand wire, behind 5 ~ 10 minutes location, room temperature places 24 hours, epoxy resin is fully solidified, reaches the highest solidification intensity.The shutoff strand other end again.Object fixing when two ends are different avoids two ends epoxy resin cure contraction stretching optical fiber, thus make grating make the raw drift of primary wave long hair under the pressure of effect of stress.Make during encapsulation optical fiber leave in strand certain more than long, the benefit done like this is FBG temperature influence in strand, can not Yin Wendu when raising strand stretch to FBG stress application.
The copper strand wire main body 1 of FBG sensor array is contained as shown in Figure 5 in the inside made.
4. the making of thermometric line rod
The manufacturing process flow of stator bar is: strand blanking braiding (Roebel transposition) → conductor lines rod shaping (straight line and end are distinguished shaping) → main insulation wrapping (comprising corona-prevention belt wrapping) → main insulation mould pressing process.First step, namely during strand braiding, the thermometric copper strand wire made in 3 is woven together with other solid strands, and experience follow-up procedure of processing, just made a thermometric line rod containing FBG temperature transducer array.
Single line rod, containing many solid strands, can select line rod diverse location to put into thermometric copper strand wire.As shown in Figure 6.
Drawn from line stick end by temperature-measuring optical fiber, the optical information through dut temperature signal madulation reaches central control room's demodulation can obtain the quasi-distributed temperature field information of stator bar multiple spot.
Embodiment one:
Composition graphs 7 one kinds has the large generator stator bar solid strand of temp sensing function, described solid strand comprises copper strand wire main body 1, it is characterized in that, described solid strand also comprises optical fiber 2, copper strand wire main body 1, long 5.4m, be provided with through hole 1-1 along its length, the diameter of through hole 1-1 is 0.5mm, the cross-section center of described through hole 1-1 overlaps with the cross-section center of copper strand wire main body 1, copper strand wire main body 1 cross section is round rectangle, round rectangle radius is 0.65mm, long is 14mm, wide is 2.12mm, optical fiber 2 is implanted in described through hole 1-1, described optical fiber 2 is serially connected with 20 fiber-optical grating temperature sensor FBG1, FBG2, FBG20, the initial wavelength of 20 FBG is respectively 1521.112nm, 1523.203nm, 1525, 476nm, 1527.934nm, 1530.040nm, 1532.164nm, 1534.170nm, 1536.172nm, 1538.005nm, 1539.918nm, 1541.937nm, 1544.001nm, 1546.124nm, 1548.228nm, 1550.191nm, 1552.203nm, 1554.188nm, 1556.099nm, 1558.330nm, 1560.006nm, distance often between adjacent two fiber-optical grating temperature sensors is 27cm.As can be seen from Figure 7 wherein 3 FBG (FBG4, FBG6, FBG10, rename as FBG-A, FBG-B, FBG-C) the wavelength temperature linearity is all better, the linearly dependent coefficient of corresponding wavelength temperature fitting a straight line is respectively 0.99912,0.99955,0.99966.
Claims (6)
1. one kind has the large generator stator bar solid strand of temp sensing function, described solid strand comprises copper strand wire main body (1), it is characterized in that, described solid strand also comprises optical fiber (2), copper strand wire main body (1) is provided with through hole (1-1) along its length, the cross-section center of described through hole (1-1) overlaps with the cross-section center of copper strand wire main body (1), optical fiber (2) is implanted in described through hole (1-1), described optical fiber (2) is serially connected with multiple fiber-optical grating temperature sensor FBG1, FBG2, FBGn, the grid region of each fiber-optical grating temperature sensor is coated with polyimide coating, the all not identical and dynamic range non-overlapping copies of wavelength change of the centre wavelength of each fiber-optical grating temperature sensor, distance often between adjacent two fiber-optical grating temperature sensors is 25 ~ 30cm.
2. a kind of large generator stator bar solid strand with temp sensing function according to claim 1, is characterized in that, the centre wavelength scope of each fiber-optical grating temperature sensor is 1520nm ~ 1560nm.
3. a kind of large generator stator bar solid strand with temp sensing function according to claim 2, is characterized in that, the diameter of described through hole (1-1) is 0.5mm.
4. a kind of large generator stator bar solid strand with temp sensing function according to claim 3, it is characterized in that, described copper strand wire main body (1) cross section is round rectangle, and round rectangle radius is 0.65mm, long is 14mm, and wide is 2.12mm.
5. a kind of large generator stator bar solid strand with temp sensing function according to claim 4, is characterized in that, described distance often between adjacent two fiber-optical grating temperature sensors is 27cm.
6. a kind of large generator stator bar solid strand with temp sensing function according to claim 5, is characterized in that, the centre wavelength of each fiber-optical grating temperature sensor described is 1540nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420635702.2U CN204087848U (en) | 2014-10-29 | 2014-10-29 | There is the large generator stator bar solid strand of temp sensing function |
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| CN201420635702.2U CN204087848U (en) | 2014-10-29 | 2014-10-29 | There is the large generator stator bar solid strand of temp sensing function |
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Granted publication date: 20150107 Termination date: 20171029 |
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| CF01 | Termination of patent right due to non-payment of annual fee |