CN204142811U - A kind of all-fiber current transformator sensing head based on the protection of sensor fibre poling - Google Patents
A kind of all-fiber current transformator sensing head based on the protection of sensor fibre poling Download PDFInfo
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- CN204142811U CN204142811U CN201420624705.6U CN201420624705U CN204142811U CN 204142811 U CN204142811 U CN 204142811U CN 201420624705 U CN201420624705 U CN 201420624705U CN 204142811 U CN204142811 U CN 204142811U
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- sensor fibre
- sensing head
- protection
- current transformator
- fiber current
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Abstract
The utility model relates to a kind of all-fiber current transformator sensing head based on the protection of sensor fibre poling; comprise sensing head upper cover, sensing head lower cover and sensor fibre; glass capillary is installed with outside described sensor fibre; space oiling between sensor fibre and glass capillary is filled, and is provided with the groove for fixing glass kapillary in sensing head lower cover.The utility model is by adopting high performance circular birefringent fiber, glass capillary is utilized to protect sensor fibre, and the multiturn that the technology mode coiling fixing glass kapillary realizes sensor fibre is wound around sensing, avoid the extraneous stress that the direct spiral winding sensor fibre of tradition is introduced, also enhance the anti-seismic performance of sensing head; And sensor fibre to adopt after poling reliability after oiling process strong, the measurement result within the scope of-40 ~ 70 DEG C of full temperature has good stability.
Description
Technical field
The utility model relates to a kind of all-fiber current transformator sensing head, is specifically related to a kind of all-fiber current transformator sensing head based on the protection of sensor fibre poling.
Background technology
Along with voltage class of electric power system improves constantly, optical fiber current mutual inductor replaces traditional electromagnetic current transducer with its significant superiority becomes inexorable trend.But optical fiber current mutual inductor system exists more problem at present, and its precision does not also reach the requirement of actual linked network, especially the precision of sensing head becomes the key factor that govern all-fiber current transformator through engineering approaches and popularize.
To the linearly polarized light of different incident ray plane of polarization, the phasic difference that in sensing head, the linear birefrigence of sensor fibre is introduced is different, thus makes system sensitivity become with the polarization angle of incident ray polarized light, reduces system reliability.In addition, the size of linear birefrigence is very responsive to the factor such as temperature, pressure, causes mutual inductor sensitivity to be subject to the impact of the factors vary such as environment temperature, pressure, vibration, reduces the stability of optical fiber current mutual inductor.Because the manufacturing technology level of sensor fibre is limited, preparation process can cause inherent linear birefrigence.Meanwhile, the external factor such as transverse pressure of bending, the micro-curved and extra asymmetric of optical fiber also can cause birefringence.Therefore, the method for suppression linear birefrigence is the gordian technique of optical fiber current mutual inductor always.
The method of existing suppression linear birefrigence, except optimizing the performance of sensor fibre own, is mainly passed through to introduce a large amount of circular birefringence to offset linear birefringence.Wherein, main scheme is the optical fiber made along optical fiber axial torsion, is such as reversed or spiral winding optical fiber on quartzy skeleton along fiber axis by single-mode fiber.But be there is along the method that fiber axis reverses the problem that circular birefringence degenerates in time in single-mode fiber, and because the circular birefringence size of introduced stress is very easily by the impact of temperature, cause the performance of this kind of Fibre Optical Sensor to change with variation of ambient temperature, thus in long-term experiment process unstable properties; And on quartzy skeleton the method for spiral winding optical fiber, be add circular birefringence by changing shape, but due to the limitation of winding process, sensor fibre is not fixed, easily vary with temperature or passage of time and changing, test repeatability is bad, and anti-seismic performance is poor.
Summary of the invention
For solving the problem, the all-fiber current transformator sensing head based on the protection of sensor fibre poling that the utility model provides a kind of good stability, anti-seismic performance strong.
For the problems referred to above, the technical scheme that the utility model is taked is: a kind of all-fiber current transformator sensing head based on the protection of sensor fibre poling, comprise sensing head upper cover, sensing head lower cover and sensor fibre, be installed with glass capillary outside described sensor fibre, the space oiling between sensor fibre and glass capillary is filled; The groove for fixing glass kapillary is provided with in sensing head lower cover.
Avoiding the extraneous stress of traditional direct spiral winding sensor fibre introducing by sensor fibre being penetrated glass capillary, also enhancing the anti-seismic performance of sensing head.Need to accomplish not Torsion sensing optical fiber in the process of poling, avoid the birefringence that introducing stress causes.Oiling process is carried out to glass capillary, make between sensor fibre and glass capillary, to be full of oily medium, utilize outer tube and silica gel that the oil that glass capillary and sensor fibre space are noted is carried out encapsulation process, avoid sensor fibre unstable in glass capillary, ensure that long-term reliability, the measurement result within the scope of-40 ~ 70 DEG C of full temperature has good stability.In order to promote the through engineering approaches Practical Performance of existing all-fiber current transformator, then inside being coiled in the groove of sensing head lower cover with the glass capillary of sensor fibre, while coiling, carrying out the fixing process of a glue according to assigned address.
Sensor fibre one end is connected with optical fiber end face reflector, and other end welding is in quarter wave plate one end, and the quarter wave plate other end is connected to protects polarisation cable.Optical fiber end face reflector, make light reflect Hou Yuan road and return, quarter wave plate makes linearly polarized light be converted into circularly polarized light, and the other end of quarter wave plate is connected to protects polarisation cable, keeps polarisation of light.
Sensor fibre and optical fiber end face reflector, sensor fibre and quarter wave plate, quarter wave plate are all completed by welding mode with guarantor's polarisation cable and are connected.
Sensing head is covered with a fairlead, protects polarisation cable and draw from fairlead.Fixing in sensor fibre importing glass capillary at the distal point glue of glass capillary, end mirror is stayed the outer end of glass capillary.Sensing head upper cover is processed with the lead riser that includes fairlead, protects polarisation cable as the exit of all-fiber current transformator sensing head, is connected and draws from fairlead with sensor fibre.
Described sensor fibre adopts circular birefringent fiber.Adopt circular birefringent fiber can suppress sensor fibre linear birefrigence, improve sensor fibre measuring accuracy.
Sensing head upper cover adopts metal material to make, and sensing head lower cover adopts nonmetallic materials to make.Why sensing head upper cover adopts metal material, for the ease of being installed on transformer by metallic support rod, the potential difference (PD) of sensing head and transformer is made to be zero, thus not affecting the normal operation of power transformer, sensing head lower cover adopts nonmetallic materials can avoid the eddy effect that cap surface is formed under sensing head upper cover and sensing head.
Together with sensing head upper cover and sensing head lower cover are screwed in by screw thread.After sensing fiber section is fixed on sensing head lower cover, sensing head upper cover and sensing head lower cover are sealed.
The utility model is by adopting high performance circular birefringent fiber, glass capillary is utilized to protect sensor fibre, and the multiturn that the technology mode coiling fixing glass kapillary realizes sensor fibre is wound around sensing, avoid the extraneous stress that the direct spiral winding sensor fibre of tradition is introduced, also enhance the anti-seismic performance of sensing head; And sensor fibre to adopt after poling reliability after oiling process strong, the measurement result within the scope of-40 ~ 70 DEG C of full temperature has good stability.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical fiber current mutual inductor;
Fig. 2 is sensing head superstructure schematic diagram;
Fig. 3 is sensing head lower cover structure schematic diagram;
Fig. 4 is the utility model Making programme figure;
Wherein, 1, sensing head upper cover, 2, sensing head lower cover, 3, sensor fibre, 4, glass capillary, 5, groove, 6, end mirror, 7, quarter wave plate, 8, protect inclined cable, 9, fairlead.
Embodiment
As shown in Figure 1, Figure 2, Figure 3 shows; based on an all-fiber current transformator sensing head for sensor fibre poling protection, comprise sensing head upper cover 1, sensing head lower cover 2 and sensor fibre 3, wherein; sensing head upper cover 1 adopts metal material to make, and sensing head lower cover 2 adopts nonmetallic materials to make.Together with sensing head upper cover 1 and sensing head lower cover 2 are screwed in by internal and external threads.Be installed with glass capillary 4 outside described sensor fibre 3, the space oiling between sensor fibre 3 and glass capillary 4 is filled; The groove 5 for fixing glass kapillary 4 is provided with in sensing head lower cover 2.Sensor fibre 3 one end welding has optical fiber end face reflector 6, and the other end is as quarter wave plate 7 one end, and the welding of quarter wave plate 7 other end has protects inclined cable 8, protects inclined cable 8 and draws from the fairlead 9 of sensing head upper cover 1.
Making programme is as shown in Figure 4:
1) silver-plated process is carried out in one end of sensor fibre, form catoptron;
2) sensor fibre is penetrated in glass capillary, end mirror is stayed one end of glass capillary, need to accomplish not Torsion sensing optical fiber in the process of poling, avoid the birefringence that introducing stress causes;
3) oiling process is carried out to glass capillary, make between sensor fibre and glass capillary, to be full of oily medium, avoid sensor fibre unstable in glass capillary, ensure that long-term reliability;
4) do quarter wave plate at the other end of sensor fibre, the other end of wave plate carries out welding with guarantor's polarisation cable and is connected;
5) sensing head light path carry out after building installation fix, first end mirror is fixed process, again inside is coiled in the groove of sensing head lower cover with the glass capillary of sensor fibre, the fixing process of a glue is carried out according to assigned address while coiling, after the distal point glue of glass capillary fixedly completes, continue, along around quarter wave plate and guarantor's polarisation cable, to make to be protect polarisation cable in the exit of sensing head, then carry out welding with one end of light path system;
6), after the upper cover of sensing head and sensing head lower cover being carried out cooperation installation, encapsulation process is carried out;
7) incoming fiber optic current transformer systems.
Above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although be described in detail the utility model with reference to above-described embodiment, those of ordinary skill in the field are to be understood that and still can modify to embodiment of the present utility model or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present utility model.
Claims (7)
1. the all-fiber current transformator sensing head based on the protection of sensor fibre poling; comprise sensing head upper cover (1), sensing head lower cover (2) and sensor fibre (3); it is characterized in that: outside described sensor fibre (3), be installed with glass capillary (4); space oiling between sensor fibre (3) and glass capillary (4) is filled, and is provided with the groove (5) for fixing glass kapillary (4) in sensing head lower cover (2).
2. the all-fiber current transformator sensing head based on the protection of sensor fibre poling according to claim 1; it is characterized in that: sensor fibre (3) one end is connected with optical fiber end face reflector (6); other end welding is in quarter wave plate (7) one end, and quarter wave plate (7) other end is connected to protects polarisation cable (8).
3. the all-fiber current transformator sensing head protected based on sensor fibre poling according to claim 2, is characterized in that: sensor fibre (3) and optical fiber end face reflector (6), sensor fibre (3) are all completed by welding mode with quarter wave plate (7), quarter wave plate (7) and guarantor's polarisation cable (8) and be connected.
4. the all-fiber current transformator sensing head based on the protection of sensor fibre poling according to Claims 2 or 3, is characterized in that: sensing head upper cover (1) has fairlead (9), protects inclined cable (8) and draw from fairlead (9).
5. the all-fiber current transformator sensing head based on the protection of sensor fibre poling according to claim 1, is characterized in that: described sensor fibre (3) adopts circular birefringent fiber.
6. the all-fiber current transformator sensing head based on the protection of sensor fibre poling according to claim 1, is characterized in that: sensing head upper cover (1) adopts metal material to make, and sensing head lower cover (2) adopts nonmetallic materials to make.
7. the all-fiber current transformator sensing head based on the protection of sensor fibre poling according to claim 1, is characterized in that: sensing head upper cover (1) and sensing head lower cover (2) are screwed in together by screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420624705.6U CN204142811U (en) | 2014-10-27 | 2014-10-27 | A kind of all-fiber current transformator sensing head based on the protection of sensor fibre poling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420624705.6U CN204142811U (en) | 2014-10-27 | 2014-10-27 | A kind of all-fiber current transformator sensing head based on the protection of sensor fibre poling |
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| CN204142811U true CN204142811U (en) | 2015-02-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280589A (en) * | 2014-10-27 | 2015-01-14 | 山东电力设备有限公司 | All-optical-fiber current transformer sensing head based on sensing optical fiber tube penetrating protection |
-
2014
- 2014-10-27 CN CN201420624705.6U patent/CN204142811U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280589A (en) * | 2014-10-27 | 2015-01-14 | 山东电力设备有限公司 | All-optical-fiber current transformer sensing head based on sensing optical fiber tube penetrating protection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20181027 |
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| CF01 | Termination of patent right due to non-payment of annual fee |