CN210894465U - All-fiber current transformer structure - Google Patents
All-fiber current transformer structure Download PDFInfo
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- CN210894465U CN210894465U CN201921851814.0U CN201921851814U CN210894465U CN 210894465 U CN210894465 U CN 210894465U CN 201921851814 U CN201921851814 U CN 201921851814U CN 210894465 U CN210894465 U CN 210894465U
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Abstract
The utility model relates to an all-fiber current transformer structure belongs to the mutual-inductor field. The SLD light source and the signal processing module are respectively connected with a coupler through optical fibers, the coupler is connected with a polarizer through the optical fibers, the polarizer is connected with a phase modulator through the optical fibers, the phase modulator is respectively connected with a quarter-wave plate and a temperature sensor through the optical fibers, and the quarter-wave plate and the reflector are respectively connected with a sensing ring through the optical fibers; and the signal processing module is connected with the phase modulator through an optical fiber and a temperature sensor. Has the advantages that: novel conception, simple structure and convenient use. High sensitivity, high anti-electromagnetic interference, high corrosion resistance and no source. Negative feedback is introduced through the temperature sensor, and the influence of temperature change on measurement precision is overcome.
Description
Technical Field
The utility model relates to a mutual-inductor field, in particular to all-fiber current transformer structure.
Background
With the development of material technology, microelectronic technology and communication technology, the application of the mutual inductor is more and more extensive. At present, the demand of the mutual inductor in China is increased at a speed of 12% per year. Particularly, in a smart grid, with the development of grid technology, an electric power system is moving to digitization and intellectualization, and a grid is developing into the smart grid. The current is one of the basic parameters measured by the power system, the current directly reflects the operation state of the power system, and provides necessary information for metering and relay protection of the power system, so the accuracy of the current measurement result directly influences the metering precision. The current and other key parameters are digitized, the accuracy and precision of the parameters are improved, and the real-time control of a power grid system and the reliability of a relay protection device are greatly improved. The electronic transformer is one of the most important devices of the intelligent substation, but the traditional transformer has the problems of insulation, magnetic saturation, resonance, explosion, harmonic wave and the like, and needs to be improved.
Disclosure of Invention
An object of the utility model is to provide an all-fiber current transformer structure has solved the above-mentioned problem that prior art exists. The utility model discloses a negative feedback is introduced to temperature sensor, overcomes the influence that temperature variation brought measurement accuracy.
The above object of the utility model is realized through following technical scheme:
in the all-fiber current transformer structure, an SLD light source 1 and a signal processing module 5 are respectively connected with a coupler 2 through optical fibers, the coupler 2 is connected with a polarizer 3 through the optical fibers, the polarizer 3 is connected with a phase modulator 4 through the optical fibers, the phase modulator 4 is respectively connected with a quarter-wave plate 7 and a temperature sensor 6 through the optical fibers, and the quarter-wave plate 7 and a reflector 9 are respectively connected with a sensing ring 8 through the optical fibers; the signal processing module 5 is connected with the phase modulator 4 through an optical fiber and a temperature sensor 6, negative feedback is introduced through the temperature sensor 6, and the influence of temperature change on measurement precision is overcome.
The sensing ring 8 is composed of a polarization maintaining optical fiber and a circular ring, and the polarization maintaining optical fiber is spirally wound on the circular ring to form a closed loop and effectively inhibit linear birefringence.
The quarter wave plate 7 is a section of 30-40cm incremental spun optical fiber.
The sensing ring 8 is a Hi-Bi round optical fiber or is composed of a polarization maintaining optical fiber and a ring, and the polarization maintaining optical fiber is spirally wound on the ring.
The temperature sensor 6 is an optical fiber temperature sensor.
The beneficial effects of the utility model reside in that: novel conception, simple structure and convenient use. High sensitivity, high anti-electromagnetic interference, high corrosion resistance and no source. Negative feedback is introduced through the temperature sensor, and the influence of temperature change on measurement precision is overcome. The practicability is strong.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate example embodiments of the invention and together with the description serve to explain the invention without limitation.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. an SLD light source; 2. a coupler; 3. a polarizer; 4. a phase modulator; 5. a signal processing module; 6. a temperature sensor; 7. a quarter wave plate; 8. a sensing ring; 9. a mirror.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1, the utility model discloses an all-fiber current transformer structure, including SLD light source 1, coupler 2, polarizer 3, phase modulator 4, signal processing module 5, temperature sensor 6, quarter-wave plate 7, sensing ring 8, speculum 9, SLD light source 1, signal processing module 5 are connected with coupler 2 through optic fibre respectively, coupler 2 is connected with polarizer 3 through optic fibre, polarizer 3 is connected with phase modulator 4 through optic fibre, phase modulator 4 is connected with quarter-wave plate 7, temperature sensor 6 respectively through optic fibre, quarter-wave plate 7, speculum 9 are connected with sensing ring 8 through optic fibre respectively; the signal processing module 5 is connected with the phase modulator 4 through an optical fiber and a temperature sensor 6, negative feedback is introduced through the temperature sensor 6, and the influence of temperature change on measurement precision is overcome.
The sensing ring 8 is composed of a polarization maintaining optical fiber and a circular ring, and the polarization maintaining optical fiber is spirally wound on the circular ring to form a closed loop and effectively inhibit linear birefringence.
The quarter wave plate 7 is a section of 30-40cm incremental spun optical fiber.
The sensing ring 8 is a Hi-Bi round optical fiber or is composed of a polarization maintaining optical fiber and a ring, and the polarization maintaining optical fiber is spirally wound on the ring.
The temperature sensor 6 is an optical fiber temperature sensor.
The utility model discloses a length of winding polarization maintaining optical fiber on the sensing ring is decided according to the ring of sensing ring. The utility model discloses an all-fiber current transformer required precision 0.2% -1.0%.
Referring to fig. 1, the working process and principle of the present invention are as follows:
light emitted from the SLD light source 1 passes through the coupler 2 and is polarized by the polarizer 3 to form linearly polarized light. Linearly polarized light is injected into the x-axis and the y-axis of the polarization maintaining fiber at an average angle of 45 degrees for transmission. The linearly polarized light is transmitted to the phase modulator 4 through the polarization maintaining fiber for initial phase modulation, and then transmitted to the quarter wave plate 7. After the two orthogonal linearly polarized light beams pass through the quarter-wave plate 7, the linearly polarized light beams in the x axis and the y axis are respectively converted into left-handed circularly polarized light and right-handed circularly polarized light, and then enter the sensing ring 8. Due to the faraday effect of the magnetic field generated by the transmission current, the two circularly polarized light beams are transmitted at different speeds, and a phase difference is generated. After the two circularly polarized lights are reflected by the mirror 9, their polarization modes are exchanged (i.e. left-handed light becomes right-handed light, and right-handed light becomes left-handed light) and pass through the sensing ring 8 for the second time, and simultaneously interact with the magnetic field generated by the current again, so that the generated phase difference is doubled. Then, the quarter-wave plate 7 converts the two circularly polarized light beams with the faraday effect back into orthogonal linearly polarized light with the exchanged modes (the original x-axis linearly polarized light is converted into the y-axis, and the y-axis linearly polarized light is converted into the x-axis) to perform secondary phase modulation by the phase modulator 4, and then transmits the two orthogonal linearly polarized light beams to the polarizer 3 to make the two orthogonal linearly polarized light beams interfere with each other. And finally, the interference light is transmitted to a photoelectric converter for signal acquisition, and is converted into an electric signal for processing.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made to the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides an all-fiber current transformer structure which characterized in that: the SLD light source (1) and the signal processing module (5) are respectively connected with the coupler (2) through optical fibers, the coupler (2) is connected with the polarizer (3) through the optical fibers, the polarizer (3) is connected with the phase modulator (4) through the optical fibers, the phase modulator (4) is respectively connected with the quarter-wave plate (7) and the temperature sensor (6) through the optical fibers, and the quarter-wave plate (7) and the reflector (9) are respectively connected with the sensing ring (8) through the optical fibers; the signal processing module (5) is connected with the phase modulator (4) through an optical fiber and a temperature sensor (6).
2. The all-fiber current transformer structure of claim 1, wherein: the sensing ring (8) is composed of a polarization maintaining optical fiber and a circular ring, and the polarization maintaining optical fiber is spirally wound on the circular ring to form a closed ring and effectively inhibit linear birefringence.
3. The all-fiber current transformer structure of claim 1, wherein: the quarter-wave plate (7) is a section of 30-40cm incremental spun optical fiber.
4. The all-fiber current transformer structure of claim 1, wherein: the sensing ring (8) is a Hi-Bi round optical fiber or consists of a polarization-maintaining optical fiber and a ring, and the polarization-maintaining optical fiber is spirally wound on the ring.
5. The all-fiber current transformer structure of claim 1, wherein: the temperature sensor (6) is an optical fiber temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921851814.0U CN210894465U (en) | 2019-10-31 | 2019-10-31 | All-fiber current transformer structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921851814.0U CN210894465U (en) | 2019-10-31 | 2019-10-31 | All-fiber current transformer structure |
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| CN210894465U true CN210894465U (en) | 2020-06-30 |
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| CN201921851814.0U Active CN210894465U (en) | 2019-10-31 | 2019-10-31 | All-fiber current transformer structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986650A (en) * | 2021-01-20 | 2021-06-18 | 河南平高电气股份有限公司 | All-fiber current transformer and temperature compensation method thereof |
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2019
- 2019-10-31 CN CN201921851814.0U patent/CN210894465U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986650A (en) * | 2021-01-20 | 2021-06-18 | 河南平高电气股份有限公司 | All-fiber current transformer and temperature compensation method thereof |
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