CN203164257U - Flexible optical current transformer - Google Patents
Flexible optical current transformer Download PDFInfo
- Publication number
- CN203164257U CN203164257U CN 201320149523 CN201320149523U CN203164257U CN 203164257 U CN203164257 U CN 203164257U CN 201320149523 CN201320149523 CN 201320149523 CN 201320149523 U CN201320149523 U CN 201320149523U CN 203164257 U CN203164257 U CN 203164257U
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- fiber
- current transformer
- flexible optical
- phase
- modulator
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Abstract
The utility model relates to a flexible optical current transformer, which comprises a fiber current sensing ring, a transmission fiber and an acquisition unit. The fiber current sensing ring is wound on the periphery of a detected one-time conductor. One end of the transmission fiber is connected with the fiber current sensing ring while the other end is connected with the acquisition unit. Compared with the prior art, the flexible optical current transformer has the advantages of flexible installation means, strong anti-interference capabilities, no insulation requirements and high stability. The intelligentized transformer station construction demands are further better satisfied.
Description
Technical field
The utility model relates to a kind of mutual inductor, especially relates to a kind of flexible optical current transformer.
Background technology
Flexible mounting means is the exclusive a kind of mounting means of optics mutual inductor, the sensor fibre softness characteristics of bending have flexibly been taken full advantage of, have flexible for installation, easy maintenance, adaptability strong, need not to consider advantage such as insulation, the sensor fibre ring be convenient to be installed in any conductor around, the convenient measurement point that in system, temporarily or forever increases, can when substation operation, install at any time simultaneously, need not test line and have a power failure, be particularly useful for engineerings such as transformer station's transformation.
But according to investigation, have only Canadian Nxtphase company to develop Related product at present in the world and in engineering with being used, domestic similar products are not developed as yet, do not see the report that engineering is used yet.For adapting to the needs of power system development, break the technical monopoly of external product, guarantee the safe and stable operation of China's network system, it is significant to research and develop domestic flexible optical current transformer.
To be environmental factors such as temperature variation, vibration, stress can produce considerable influence to the sensing accuracy of sensor fibre and stability to the greatest factor that all the time limits the optical current mutual inductance, this mainly be because:
1, the linear birefrigence meeting that exists in the sensor fibre ring produces system's probe current information and disturbs;
2, the variation of the phase delay of λ/4 wave plates can cause the variation of the scale factor of mutual inductor, and influences precision and the stability of mutual inductor;
3, the skeleton that twines of optical fiber can exert an influence to fiber optic loop, and the vibration of skeleton simultaneously and effect such as expand with heat and contract with cold also can influence mutual inductor and measure.
The utility model content
The purpose of this utility model be exactly provide in order to overcome the defective that above-mentioned prior art exists that a kind of mounting means is flexible, antijamming capability strong, need not to insulate, stability is high, satisfied the flexible optical current transformer of the demand of intelligent transformer substation construction preferably.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of flexible optical current transformer, it is characterized in that, comprise fiber-optic current sensor ring, Transmission Fibers and collecting unit, described fiber-optic current sensor ring is wrapped in tested Primary Conductor periphery, described Transmission Fibers one end connects the fiber-optic current sensor ring, and the other end connects collecting unit.
Described collecting unit comprises light source, coupling mechanism, the polarizer, polarization splitting prism, phase-modulator, photo-detector and demodulator circuit, described light source, coupling mechanism, the polarizer, polarization splitting prism, phase-modulator, demodulator circuit, photo-detector connect successively, described photo-detector is connected with coupling mechanism, and described phase-modulator is connected with Transmission Fibers.
Described Transmission Fibers is the armouring optical cable.
Described fiber-optic current sensor ring output port is provided with wave plate and catoptron.
Described wave plate is
Wave plate.
The magnetic field that described fiber-optic current sensor ring utilizes the Faraday magneto-optic effect induction primary current of polarized light in optical fiber to produce, the output light signal is connected to collecting unit by Transmission Fibers.
Described collecting unit carries out computing to the light signal that receives and obtains primary current.
Described fiber-optic current sensor ring twines with the optical cable form, filling oily substance in the optical cable, and sensor fibre is immersed in the oil,
Described sensor fibre adopts low birefringent fiber.
Compared with prior art, the utlity model has following advantage:
1, the utility model adopts the flexible optical current transformer of reflective Sagnac interferometer structure, realize reciprocal structure by a catoptron, return through original route after can making two bundle crossed polarized light reflections, it is the complete symmetry light path, can reduce temperature, vibration, stress etc. to the influence of light path, make stability of layout improve, be subjected to the influence of environmental change littler, guaranteed that optical current mutual inductor has good stable and temperature characterisitic.
2, the utility model selects low birefringent fiber as sensor fibre, and the high conformity of low birefringent fiber own, linear birefrigence are little, and temperature influence is less.
3, the sensor fibre ring twines with the optical cable form in the utility model, filling oily substance in the optical cable, sensor fibre is immersed in the oil, the influence such as expand with heat and contract with cold of stress, vibration, the oil that can evenly disperse optical cable to be subjected to, also can effectively stop in other mounting means to improve mutual inductor stability because twining influences such as stress that skeleton causes, vibration.
Description of drawings
Fig. 1 is structured flowchart of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
As shown in Figure 1, a kind of flexible optical current transformer, comprise fiber-optic current sensor ring 1, Transmission Fibers 4 and collecting unit 5, described fiber-optic current sensor ring 1 is wrapped in tested Primary Conductor 6 peripheries, described Transmission Fibers 4 one ends connect fiber-optic current sensor ring 1, and the other end connects collecting unit 5.
Described collecting unit 5 comprises light source 51, coupling mechanism 52, the polarizer 53, polarization splitting prism 54, phase-modulator 55, photo-detector 57 and demodulator circuit 56, described light source 51, coupling mechanism 52, the polarizer 53, polarization splitting prism 54, phase-modulator 55, demodulator circuit 56, photo-detector 57 connect successively, described photo-detector 57 is connected with coupling mechanism 52, and described phase-modulator 55 is connected with Transmission Fibers 4.
Described Transmission Fibers 4 is the armouring optical cable.Described fiber-optic current sensor ring 1 output port is provided with wave plate 3 and catoptron 2.Described wave plate 3 is
Wave plate.
Principle of work is the magnetic field that the fiber-optic current sensor ring utilizes the Faraday magneto-optic effect induction primary current of polarized light in optical fiber to produce; Output signal is connected to collecting unit by Transmission Fibers, and the light signal that Transmission Fibers is sent collecting unit is transported to fiber-optic current sensor ring end, and the signal that the current sense ring is returned is delivered to collecting unit and handled simultaneously; Collecting unit is sent to sensor side with the light signal that light source produces; the light signal that carries primary current information that the while receiving sensor returns; and the light signal that returns handled; calculate the primary current value; and this primary current is sent to carries out each synchronised in the merge cells; export devices such as protection, measurement, metering afterwards to, also can be directly and computerized measurement and protective device interface.
Collecting unit adopts the realization of reflection type optical fiber Sagnac interference technique to the measurement of light signal, and reflection type optical fiber Sagnac interference technique has reduced the influence that sensor is disturbed by factors such as environment temperature, vibration, has improved sensor accuracy.
The light that comes out from phase-modulator enters the polarization maintaining optical fibre lag line.Two main shafts of polarization maintaining optical fibre lag line and the main shaft of phase-modulator are consistent, it has two effects: 1, passing to sensor fibre with sensor fibre every the light that gets far light source, phase-modulator output, sensor fibre and light source, detector and signal processing electronic circuit are separated.2, the high birefringence optical fiber of sufficient length provides enough time delays, light in polarization maintaining optical fibre lag line and sensor fibre round trip during this period of time in, the modulation waveform that is added to phase-modulator just changes half period.
The polarization maintaining optical fibre lag line come out two the bundle polarized lights respectively along its two spindle vibration, this two-beam through 45 ° of pads after, enter
Wave plate,
The main shaft of wave plate and polarization maintaining optical fibre lag line is at 45, enters sensor fibre then.
The effect of wave plate is that the two bundle cross line polarisations that polarization maintaining optical fibre lag line two main shafts come out are converted to rotatory polarization.
Wave plate is the long polarization maintaining optical fibre of one little section long bat, and its length is the long odd-multiple of 1/4 bat.
From
What wave plate came out is the opposite rotatory polarizations of two rotation directions.Direction of vibration is along the light quilt of polarization maintaining optical fibre lag line X-axis
Wave plate converts the dextrorotation rotatory polarization to, and direction of vibration is along the light quilt of polarization maintaining optical fibre lag line Y-axis
Wave plate converts left-handed rotatory polarization to.Owing to there is electromagnetic field around the sensor fibre, this two bundles rotatory polarization transmits in sensor fibre with friction speed, and the phase differential of accumulation is directly proportional with the magnetic field that is applied to sensor fibre.The end of sensor fibre is connected with a catoptron.Total reflection takes place in the two bundle rotatory polarizations that transmit in the low-birefringence sensor fibre after running into catoptron, the two rotation direction changes.Return after reflection in the way, dextrorotation rotatory polarization originally becomes left-handed rotatory polarization, and left-handed rotatory polarization originally becomes the dextrorotation rotatory polarization.Because rotation direction and the transmission direction of two rotatory polarizations all change when returning, the accumulation relative phase shift of the two doubles.Like this, total phase shift Δ φ=4VNI, wherein V is the Verdet constant of sensor fibre, and N is the number of turns that is wrapped in current lead sensor fibre on every side, and I is the size of current in the lead.
Two bundle rotatory polarizations transmit one back and forth and warp in sensor fibre
Behind the wave plate, originally the line polarisation along HiBi fibre delay line X axis vibration becomes when returning along the line polarisation of HiBi fibre delay line Y axis vibration, originally the line polarisation along HiBi fibre delay line Y axis vibration becomes when returning along the line polarisation of HiBi fibre delay line X axis vibration, this two bunch polarisation passes through phase-modulator again, behind 45 ° of pads, interfere at polarizer place.Light after the interference is coupled device and tells part arrival PD detector.
In light path, two-beam has experienced identical polarization variations in reverse order.Sensor fibre is positioned at the centre of two-beam light path, and unique phase differential of two-beam is to be caused by the magnetic field that sensing unit exists.
The PD detector detects is light intensity after two-beam is interfered, wherein includes the phasic difference information of the two, also just includes the information of magnetic field and electric current.
In above-mentioned optical device the Fibre Optical Sensor ring and
Wave plate is the major part of fibre optic current sensor, and Transmission Fibers is passed from insulator, and other optical device then concentrates in the collecting unit substantially.
Claims (5)
1. flexible optical current transformer, it is characterized in that, comprise fiber-optic current sensor ring, Transmission Fibers and collecting unit, described fiber-optic current sensor ring is wrapped in tested Primary Conductor periphery, described Transmission Fibers one end connects the fiber-optic current sensor ring, and the other end connects collecting unit.
2. a kind of flexible optical current transformer according to claim 1, it is characterized in that, described collecting unit comprises light source, coupling mechanism, the polarizer, polarization splitting prism, phase-modulator, photo-detector and demodulator circuit, described light source, coupling mechanism, the polarizer, polarization splitting prism, phase-modulator, demodulator circuit, photo-detector connect successively, described photo-detector is connected with coupling mechanism, and described phase-modulator is connected with Transmission Fibers.
3. a kind of flexible optical current transformer according to claim 1 is characterized in that, described Transmission Fibers is the armouring optical cable.
4. a kind of flexible optical current transformer according to claim 1 is characterized in that, described fiber-optic current sensor ring output port is provided with wave plate and catoptron.
5. a kind of flexible optical current transformer according to claim 4 is characterized in that described wave plate is
Wave plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320149523 CN203164257U (en) | 2013-03-28 | 2013-03-28 | Flexible optical current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320149523 CN203164257U (en) | 2013-03-28 | 2013-03-28 | Flexible optical current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203164257U true CN203164257U (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320149523 Expired - Lifetime CN203164257U (en) | 2013-03-28 | 2013-03-28 | Flexible optical current transformer |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235167A (en) * | 2013-03-28 | 2013-08-07 | 国家电网公司 | Flexible optical current transformer |
| CN104655900A (en) * | 2013-11-18 | 2015-05-27 | 南京南瑞继保电气有限公司 | All-fiber current transformer and method of measuring zero-sequence current at power generator end |
| CN107884611A (en) * | 2016-09-30 | 2018-04-06 | 南京南瑞继保电气有限公司 | A kind of polycyclic all-fiber current transformator |
| CN110687337A (en) * | 2019-09-17 | 2020-01-14 | 中国计量科学研究院 | Self-compensating device and method for inhibiting nonlinearity of optical fiber current sensor |
-
2013
- 2013-03-28 CN CN 201320149523 patent/CN203164257U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235167A (en) * | 2013-03-28 | 2013-08-07 | 国家电网公司 | Flexible optical current transformer |
| CN104655900A (en) * | 2013-11-18 | 2015-05-27 | 南京南瑞继保电气有限公司 | All-fiber current transformer and method of measuring zero-sequence current at power generator end |
| CN104655900B (en) * | 2013-11-18 | 2017-10-13 | 南京南瑞继保电气有限公司 | A kind of all-fiber current transformator and the method for measuring generator generator terminal zero-sequence current |
| CN107884611A (en) * | 2016-09-30 | 2018-04-06 | 南京南瑞继保电气有限公司 | A kind of polycyclic all-fiber current transformator |
| CN110687337A (en) * | 2019-09-17 | 2020-01-14 | 中国计量科学研究院 | Self-compensating device and method for inhibiting nonlinearity of optical fiber current sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
|
| CX01 | Expiry of patent term |