CN104237601A - Optical current transformer - Google Patents
Optical current transformer Download PDFInfo
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- CN104237601A CN104237601A CN201310252860.XA CN201310252860A CN104237601A CN 104237601 A CN104237601 A CN 104237601A CN 201310252860 A CN201310252860 A CN 201310252860A CN 104237601 A CN104237601 A CN 104237601A
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- optical fiber
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Abstract
The invention discloses an optical current transformer. The optical current transformer comprises a collecting unit, a transmission optical cable and a primary sensor, wherein the primary sensor comprises a sensing optical cable. The sensing optical cable comprises a sensing optical fiber, a flexible material layer, an optical cable outer sheath and an optical fiber fixing piece, wherein the optical fiber fixing piece is fixed to the tail end of the sensing optical fiber, the optical fiber fixing piece and the optical cable outer sheath are tightly sealed in a thermal shrinkage and sleeved mode, and the sealed optical cable outer sheath is filled with flexible materials for forming the flexible material layer. According to the optical current transformer of the structure, the flexible and bendable optical cable is used for measuring current signals, the primary sensor can be installed at any position of a primary conductor, currents in conductors in any shape can be measured through the transformer, and power does not need to be cut off during installation and maintenance.
Description
Technical field
The present invention relates to the application process of a kind of flexible optical cable in optical current mutual inductor, adopt the detection that the flexible optical current transformer of the method is applicable to primary current signal in digital transformer substation or power plant, industrial and mining enterprises.
Background technology
Current transformer be monitoring operation states of electric power system visual plant, in transformer station measure, monitoring and protecting control rely on it obtain measurements, metering, protect needed for current information.Traditional current transformer is electromagnetic transformer, and electromagnetic transformer is due to the needs of volume heaviness, complicated, the easy magnetic saturation of insulation system, easily ferroresonance, reason more and more can not the meet development such as Automation of Electric Systems, digitizing net such as range of dynamic measurement is little, response band is narrow.Optical current mutual inductor has that insulation system is simple, volume is little, lightweight, the linearity good, there is not the advantage such as magnetic saturation and ferroresonance problem, and replacing traditional electromagnetic transformer has become inevitable.
In optical current mutual inductor, most important parts are sensor fibres, after sensor fibre is rotated several weeks around Primary Conductor, and can current signal in direct proportion ground sensing tested Primary Conductor.The optical current mutual inductor of current application sensor fibre is coiled in the sensing ring fixing support frame being made fixed sturcture, optical fiber tail-end sticks with glue knot fixed position on skeleton, such Problems existing is: sensor fibre and support frame close contact, the expanding with heat and contract with cold of support frame, vibration etc. have a great impact its sensing characteristics, and mutual inductor precision can have a greater change; Optical fiber tail-end is bonded in support frame gluing characteristic can slowly change, after causing long-time running, optical fiber tail-end slow releasing stress, affects mutual inductor precision; Sensor fibre lacks protection, optical fiber frangibility; Optical fiber contacts with air for a long time, and fibre core is subject to aqueous vapor corrosion impact sensing accuracy, and the easy aging generation extra-stress of fibre cladding affects mutual inductor precision.Simultaneously the contour structures of the structures shape optical current mutual inductor of support frame is fixing, the conventional conventional application scenario such as GIS transformer station, AIS transformer station can only be applicable to, for some specific application scenario or demand, as substation section transformation, to add measurement point, installing space narrow and small etc. temporarily, cannot satisfy the demands well.
Based on above analysis, the present inventor is devoted to study a kind of optical current sensor structure that can overcome existing structure shortcoming, and this case produces thus.
Summary of the invention
Object of the present invention, be to provide a kind of optical current mutual inductor, it adopts the optical cable measurements current signal of flexible, and primary transducer can be arranged on the optional position of tested Primary Conductor, mutual inductor can measure the electric current in arbitrary shape conductor, without the need to having a power failure during installation and maintenance.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of optical current mutual inductor, comprise collecting unit, transmission cable and primary transducer, wherein, primary transducer comprises sensing optic cable, described sensing optic cable comprises sensor fibre, flexible material layer, cable outer sheath and optical fiber fixture, and wherein, optical fiber fixture is fixed on the tail end of sensor fibre, and and described optical fiber fixture and cable outer sheath are undertaken being locked and sealing by pyrocondensation mode, inject in cable outer sheath after sealing flexible material formed flexible material layer.
When above-mentioned optical fiber fixture and sensor fibre are fixed, be carry out metal coating to the tail end of sensor fibre to form metal-plated rete, then the optical fiber fixture of this metal-plated rete and metal material is carried out electric welding.
Above-mentioned flexible material layer adopts gel to make.
After adopting such scheme, flexible optical cable is applied in optical current mutual inductor by the present invention, sensing optic cable can be arranged on the optional position of tested Primary Conductor, sensing optic cable can bend arbitrarily, mutual inductor is applicable to measuring the electric current in arbitrary shape conductor, the problem that traditional optical current transformer precision is subject to temperature, vibration and stress influence can be overcome, installation and maintenance are easy, applied range, accuracy of measurement are high, dynamic range is large, transient characterisitics are good, can coordinate with the Primary Conductor of arbitrary shape, without the need to having a power failure during installation and maintenance; Secondly, sensing optic cable volume is little, lightweight, installation and maintenance are easy, for transforming in transformer station, newly-increased measurement point, the application such as installing space is narrow and small, the duration is short, the construction time can not have a power failure and Primary Conductor is oversize, all can provide good solution, good economic benefits and social benefit can be obtained.The present invention also can substitute GIS or AIS optical transformer etc., applies in the digital transformer substation of all kinds of conventional requirement.
Accompanying drawing explanation
Fig. 1 is integrated stand composition of the present invention;
Fig. 2 is the structural representation of sensing optic cable in the present invention;
Fig. 3 is the application schematic diagram of sensing optic cable in the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
The invention provides a kind of optical current mutual inductor, optical fiber is adopted to be Faraday material, sensor fibre is enclosed within the outer magnetic field produced by farady magneto-optic effect induction primary current of Primary Conductor, adopts the measurement of reflection type optical fiber Sagnac interference technique realization to light signal.
As shown in Figure 1, a kind of optical current mutual inductor of the present invention, comprise the collecting unit, transmission cable 10 and the sensing optic cable 8 that connect successively, wherein, collecting unit provides light signal for system and calculates primary current, comprise light source, coupling mechanism, phase-modulator, photo-detector and modulation /demodulation electronic circuit, light source is for generation of satisfactory light signal, the optical signal transmission that said light source produces by coupling mechanism to phase-modulator, and will pass in photo-detector via the light signal that transmission cable 10 returns from sensing optic cable 8; Described phase-modulator is modulated the light signal in system, makes system works at responsive section and avoids low frequency noises; Described photo-detector receives coupling mechanism and passes the light signal of coming, and is converted to electric signal feeding modulation /demodulation electronic circuit and carries out computing; Modulation /demodulation electronic circuit applies modulation signal to phase-modulator and carries out demodulation computing, calculates primary current value; Transmission cable 10 for connecting collecting unit and sensing optic cable 8, and keeps the constant of light signal polarization state; Sensing optic cable 8 comprises the parts such as wave plate 11, catoptron 5 and sensor fibre 3, for realizing the induction to primary current signal, the linearly polarized light signal transmitted from transmission cable 10 is converted into circularly polarized light by wave plate 11, in sensor fibre 8, produce phase offset by primary current effect, and be reflected back in collecting unit by catoptron 5.
As shown in Figure 2, it is the structural representation of sensing optic cable 8, described sensing optic cable comprises sensor fibre 3, flexible material layer, cable outer sheath 7 and optical fiber fixture 1, wherein, optical fiber fixture 1 is fixed on the tail end of sensor fibre 3, for being fixed sensor fibre 3, prevent the catoptron 5 of sensor fibre tail end from rotating or displacement, specifically can carry out metal coating at the tail end of sensor fibre 3, form metal-plated rete 4, again this metal-plated rete 4 is placed in optical fiber welding groove 2, metal-plated rete 4 and optical fiber fixture 1 are carried out electric welding; And described optical fiber fixture 1 is undertaken being locked and sealing by pyrocondensation mode with cable outer sheath 7, injecting flexible material 6 in cable outer sheath 7 after sealing forms flexible material layer, thus obtains complete sensing optic cable 8.
Described flexible material can adopt gel or other low bullet state material, has following advantage:
(1) sensor fibre 3 is immersed in flexible material 6, and flexible material 6 can carry out good protection to sensor fibre 3, impaired when preventing sensor fibre 3 pressurized or bending;
(2) flexible material 6 completely cuts off air, makes sensor fibre 3 can not produce aging by influence of moisture;
(3) flexible material 6 has low bullet step response, and sensor fibre 3 can be subject to larger resistance wherein, can reduce the vibration effect that sensor fibre 3 is subject to, and the homogeneity that sensor fibre 3 rotates and stability also can improve;
(4) expanding with heat and contract with cold of flexible material 6 produces each to the consistent homogeneous state of stress to sensor fibre 3, and optic fibre characteristic Yin Wendu therefore can not be made to change.
In addition, sensor fibre 3 needs to keep certain rotation to increase circular birefringence in the process turning to fiber optic loop, to reduce the birefringent impact of optical fiber neutral line, and the rotation slow releasing introduced in During Process of Long-term Operation will be avoided to fall; Fiber spinning is released can cause circular birefringence minimizing, the stability of light CT changes.The tail end of sensor fibre 3 can be fixed in the light CT of other type and be wound around to keep the rotation of optical fiber on skeleton, and in flexible light CT, sensor fibre 3 is immersed in the flexible material 6 in sensing optic cable 8, sensor fibre tail end meeting autorotation is by stress relief.The measure that mutual inductor of the present invention is taked is: sensor fibre tail end is plated layer of metal film plating layer 4, this metal-plated rete 4 is welded with the optical fiber fixture 1 of metal material, metal solder can ensure the fixing of sensor fibre 3 and optical fiber fixture 1 relative position, maintain the long-time stability of sensor fibre 3 rotation status, can not along with time slow releasing stress.
The present invention is when applying, coordinate shown in Fig. 3, the periphery that only sensing optic cable 8 need be wrapped in Primary Conductor 9 can be measured current signal, and canoe is flexible, can select according to the flexible shapes of Primary Conductor 9, and the physical dimension of Primary Conductor 9 is had no requirement.The space that described sensing optic cable 8 takies is very little, and construction is simple, meanwhile, when sensing optic cable 8 is wound around and installs, allows in Primary Conductor 9 charged, significantly can reduce the construction period, avoids transformer station to have a power failure the economic loss caused.Sensing optic cable 8 is connected by pyrocondensation mode with transmission cable 10.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (3)
1. an optical current mutual inductor, comprises collecting unit, transmission cable and primary transducer, and wherein, primary transducer comprises sensing optic cable; It is characterized in that: described sensing optic cable comprises sensor fibre, flexible material layer, cable outer sheath and optical fiber fixture, wherein, optical fiber fixture is fixed on the tail end of sensor fibre, and and described optical fiber fixture and cable outer sheath are undertaken being locked and sealing by pyrocondensation mode, inject in cable outer sheath after sealing flexible material formed flexible material layer.
2. a kind of optical current mutual inductor as claimed in claim 1, it is characterized in that: when described optical fiber fixture and sensor fibre are fixed, be carry out metal coating to the tail end of sensor fibre to form metal-plated rete, then the optical fiber fixture of this metal-plated rete and metal material is carried out electric welding.
3. a kind of optical current mutual inductor as claimed in claim 1, is characterized in that: described flexible material layer adopts gel to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310252860.XA CN104237601A (en) | 2013-06-24 | 2013-06-24 | Optical current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310252860.XA CN104237601A (en) | 2013-06-24 | 2013-06-24 | Optical current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN104237601A true CN104237601A (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310252860.XA Pending CN104237601A (en) | 2013-06-24 | 2013-06-24 | Optical current transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581024A (en) * | 2017-09-29 | 2019-04-05 | 南京南瑞继保电气有限公司 | A kind of optical fiber current mutual inductor |
| CN113466528A (en) * | 2021-06-10 | 2021-10-01 | 北京自动化控制设备研究所 | High-reliability optical fiber current transformer acquisition unit and manufacturing method thereof |
-
2013
- 2013-06-24 CN CN201310252860.XA patent/CN104237601A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581024A (en) * | 2017-09-29 | 2019-04-05 | 南京南瑞继保电气有限公司 | A kind of optical fiber current mutual inductor |
| CN113466528A (en) * | 2021-06-10 | 2021-10-01 | 北京自动化控制设备研究所 | High-reliability optical fiber current transformer acquisition unit and manufacturing method thereof |
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Application publication date: 20141224 |