CN112362945A - Optical current measuring device - Google Patents
Optical current measuring device Download PDFInfo
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- CN112362945A CN112362945A CN202011353249.2A CN202011353249A CN112362945A CN 112362945 A CN112362945 A CN 112362945A CN 202011353249 A CN202011353249 A CN 202011353249A CN 112362945 A CN112362945 A CN 112362945A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 60
- 239000013307 optical fiber Substances 0.000 claims abstract description 37
- 239000013078 crystal Substances 0.000 claims abstract description 33
- 238000012937 correction Methods 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 7
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 7
- 230000007774 longterm Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The application discloses an optical current measuring device, which comprises a photoelectric demodulation system, a sensing head system, an optical fiber splitter, a dynamic correction system and a magnetic shielding system; the photoelectric demodulation system comprises a photoelectric demodulation unit and a light source, the photoelectric demodulation unit is connected with the uplink interface of the optical fiber splitter through an optical cable, and the light source is connected with the crystal light valve sensor and the dynamic correction system through the optical fiber splitter; the sensing head system comprises one or more crystal light valve sensors and a conductive rod, the crystal light valve sensors are fixed around the conductive rod, and two ends of the crystal light valve sensors are connected with the downlink optical interface of the optical fiber branching device through optical fibers; the dynamic correction system is connected with the downlink interface of the optical fiber splitter through an optical fiber; the magnetic shielding system comprises a shielding magnetic ring which is fixed on the crystal light valve sensor. The application provides an optical current measuring device can effectively avoid electromagnetic interference, and can keep permanent performance stability and temperature stability.
Description
Technical Field
The present application relates to the field of electrical equipment technology, and more particularly, to an optical current measuring device.
Background
At present, in high-voltage high-power direct current or alternating current power transmission, the optical method for measuring the current on a high-voltage transmission line is widely concerned, and the research and development and application of various photoelectric current transformers based on the optical fiber technology are widely regarded internationally. In high-voltage high-power direct current or alternating current power transmission, the current on a high-voltage transmission line is measured mainly by utilizing magneto-optical effects such as Faraday effect and the like.
In the prior art, a method for measuring current on a high-voltage transmission line by utilizing magneto-optical effects such as a Faraday effect and the like mainly uses a local magnetic field to measure and calculate the current. However, when the current on the high-voltage transmission line is measured by adopting the method, the measurement of the magnetic field is interfered by external uncertain factors, so that the relation between the magnetic field and the current is deviated, and the measured current error is larger. Common interference sources include the wiring mode of high-voltage transmission lines, external current and the like.
The optical current transformer manufactured by using the crystal magnetic light valve has wide application prospect, has the advantages of simple and reliable insulation, strong anti-electromagnetic interference capability, small size, high-precision measurement, convenient installation and transportation and the like, has considerable cost performance, and has the problems of performance stability, temperature stability and the like in long-term operation.
Therefore, it is a problem to be solved by those skilled in the art to design an optical current measuring device that can effectively avoid electromagnetic interference and maintain long-term performance stability and temperature stability.
Disclosure of Invention
In order to solve the technical problem, the application provides an optical current measuring device, which can effectively avoid electromagnetic interference and can keep long-term performance stability and temperature stability.
The technical scheme provided by the application is as follows:
an optical current measuring device comprises a photoelectric demodulation system, a sensing head system, an optical fiber splitter, a dynamic correction system and a magnetic shielding system;
the photoelectric demodulation system comprises a photoelectric demodulation unit and a light source, the photoelectric demodulation unit is connected with the uplink interface of the optical fiber splitter through an optical cable, and the light source is connected with the crystal light valve sensor and the dynamic correction system through the optical fiber splitter;
the sensing head system comprises one or more crystal light valve sensors and a conductive rod, the crystal light valve sensors are fixed around the conductive rod, and two ends of the crystal light valve sensors are connected with the downlink optical interfaces of the optical fiber branching devices through optical fibers;
the dynamic correction system is connected with a downlink interface of the optical fiber branching device through an optical fiber;
the magnetic shielding system comprises a shielding magnetic ring which is fixed on the crystal light valve sensor.
Preferably, the shielding magnetic ring is sleeve-shaped and is provided with a through hole for a measured conductor to pass through.
Preferably, the shielding magnetic ring is wound with a coil, and the coil is continuously wound on the inner surface and the outer surface of the shielding magnetic ring around the longitudinal section of the shielding magnetic ring.
Preferably, the shielding magnetic ring is made of a silicon steel sheet or an amorphous alloy material through compression joint.
Preferably, the dynamic correction system includes an optical scale, and the optical scale is connected with the optical fiber splitter downlink interface.
Preferably, the light source is a laser emitter.
The optical current measuring device provided by the invention sends out a first constant optical signal, a second constant optical signal and a third constant optical signal through the light source, and the first constant optical signal, the second constant optical signal and the third constant optical signal are respectively transmitted to the crystal light valve sensor and the dynamic correction system through the optical fiber splitter, a magnetic field signal of a measured current sensed by the crystal light valve sensor is transmitted back to the photoelectric demodulation unit through the optical fiber splitter, and the photoelectric demodulation unit converts the fed back optical signal into an electric signal and demodulates the electric signal to calculate the measured current. The dynamic correction system is used for converting the optical signal into current, a reference magnetic field is formed outside the crystal light valve sensor, and the crystal light valve sensor detects the reference magnetic field and a detected magnetic field generated by the uniform magnetic system at the same time. Because the shielding magnetic ring is arranged, the magnetic field is not influenced by the magnetic field generated by the interference source outside the shielding magnetic ring. Therefore, the electromagnetic interference can be effectively avoided, and the long-term performance stability and temperature stability can be kept.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical current measuring device according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
Embodiments of the present invention are written in a progressive manner.
The embodiment discloses an optical current measuring device, as shown in fig. 1, including a photoelectric demodulation system, a sensing head system, an optical fiber splitter 3, a dynamic correction system 4 and a magnetic shielding system;
the photoelectric demodulation system comprises a photoelectric demodulation unit 1 and a light source 2, wherein the photoelectric demodulation unit 1 is connected with an uplink interface of the optical fiber splitter 3 through an optical cable, and the light source 2 is connected with the crystal light valve sensor 5 and the dynamic correction system 4 through the optical fiber splitter 3;
the sensing head system comprises one or more crystal light valve sensors 5 and a conductive rod 6, the crystal light valve sensors 5 are fixed around the conductive rod 6, and two ends of the crystal light valve sensors 5 are connected with the downlink optical interface of the optical fiber branching device 3 through optical fibers;
the dynamic correction system 4 is connected with the downlink interface of the optical fiber branching device 3 through an optical fiber;
the magnetic shielding system comprises a shielding magnetic ring 7, and the shielding magnetic ring 7 is fixed on the crystal light valve sensor 5.
In actual use, the light source 2 emits a first optical signal, a second optical signal and a third optical signal which are constant, the first optical signal and the second optical signal are transmitted to the crystal light valve sensor 5 through the optical fiber splitter 3, the third optical signal is transmitted to the dynamic correction system 4 through the optical fiber splitter 3, a magnetic field signal of a measured current sensed by the crystal light valve sensor 5 is transmitted back to the photoelectric demodulation unit 1 through the optical fiber splitter 3, and the photoelectric demodulation unit 1 converts the fed back optical signal into an electrical signal and demodulates the electrical signal to calculate the measured current.
The dynamic correction system 4 is used for converting the optical signal into current, so as to form a reference magnetic field outside the crystal light valve sensor 5, and the crystal light valve sensor 5 detects the reference magnetic field and the detected magnetic field generated by the uniform magnetic system at the same time. Due to the arrangement of the shielding magnetic ring 7, the magnetic field is not influenced by the magnetic field generated by the interference source outside the shielding magnetic ring 7.
Generally, the wavelength of the first optical signal is 1500nm, and the power is 400 μ W; the wavelength of the second optical signal is 1450nm, and the power of the second optical signal is 400 mu W; the third optical signal has a wavelength of 950nm and a power of 120 μ W. More preferably, the first optical signal and the second optical signal constitute a differential dual optical path. The influence of factors such as temperature, magnetic field and the like is eliminated, and the external magnetic field interference is eliminated through differential double-optical-path detection, so that the measurement precision of the optical current transformer is greatly improved.
The optical current measuring device provided by the invention has the advantages that a plurality of constant optical signals are sent by the light source 2 and are respectively transmitted to the crystal light valve sensor 5 and the dynamic correction system 4 through the optical fiber branching device 3, the magnetic field signal of the measured current sensed by the crystal light valve sensor 5 is transmitted back to the photoelectric demodulation unit 1 through the optical fiber branching device 3, and the photoelectric demodulation unit 1 converts the fed back optical signals into electric signals and demodulates the electric signals to calculate the measured current. The dynamic correction system 4 is used for converting the optical signal into current, a reference magnetic field is formed outside the crystal light valve sensor 5, and the crystal light valve sensor 5 detects the reference magnetic field and the measured magnetic field generated by the uniform magnetic system at the same time. Due to the arrangement of the shielding magnetic ring 7, the magnetic field is not influenced by the magnetic field generated by the interference source outside the shielding magnetic ring 7. Therefore, the electromagnetic interference can be effectively avoided, and the long-term performance stability and temperature stability can be kept.
Preferably, the shielding magnetic ring 7 is sleeve-shaped and is provided with a through hole for the tested conductor to pass through.
The shielding magnetic ring 7 is in a sleeve shape, and when the shielding magnetic ring is used for measurement, the circle center of the shielding magnetic ring 7 and the axis of a measured conductor can be preferably arranged in a superposition mode.
Preferably, the shielding magnetic ring 7 is wound with a coil, and the coil is continuously wound on the inner surface and the outer surface of the shielding magnetic ring 7 around the longitudinal section of the shielding magnetic ring 7.
The arrangement of the coil can ensure that the shielding magnetic ring 7 can not be magnetically saturated in the whole current measurement range. When the current in the measured conductor is alternating current, the generated alternating magnetic field generates induced current in the coil. The inner and outer dimensions of the shielding magnet ring 7 and the number of coils are set according to the measurement target values of the current measuring device, which are determined by the specific measurement environment.
Preferably, the shielding magnetic ring 7 is made of a silicon steel sheet or an amorphous alloy material through compression joint.
The shielding magnetic ring 7 is a ring-shaped magnetic conductor containing high magnetic permeability: the magnetic conductor can be made by silicon steel sheet or amorphous alloy material ring winding, and can also be made by pressing other materials with low magnetic loss and high magnetic conductivity.
Preferably, the dynamic correction system 4 comprises an optical scale, which is interfaced downstream from the fiber splitter 3.
In practice, besides the optical scale, other devices or components capable of realizing dynamic correction can be adopted, and the specific type will not be described again.
Preferably, the light source 2 is a laser emitter.
In practice, besides the laser emitter, other devices or components for emitting light may be used, and the specific type will not be described again.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of a plurality of or a plurality of is two or more unless specifically limited otherwise.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An optical current measuring device is characterized by comprising a photoelectric demodulation system, a sensing head system, an optical fiber splitter, a dynamic correction system and a magnetic shielding system;
the photoelectric demodulation system comprises a photoelectric demodulation unit and a light source, the photoelectric demodulation unit is connected with the uplink interface of the optical fiber splitter through an optical cable, and the light source is connected with the crystal light valve sensor and the dynamic correction system through the optical fiber splitter;
the sensing head system comprises one or more crystal light valve sensors and a conductive rod, the crystal light valve sensors are fixed around the conductive rod, and two ends of the crystal light valve sensors are connected with the downlink optical interfaces of the optical fiber branching devices through optical fibers;
the dynamic correction system is connected with a downlink interface of the optical fiber branching device through an optical fiber;
the magnetic shielding system comprises a shielding magnetic ring which is fixed on the crystal light valve sensor.
2. Optical current measuring device according to claim 1, characterized in that the shielding magnetic ring is sleeve-shaped and provided with a through hole for the conductor under test to pass through.
3. The optical current measuring device as claimed in claim 2, wherein said shielding magnetic ring is wound with a coil, said coil being continuously wound on an inner surface and an outer surface of said shielding magnetic ring around a longitudinal section of said shielding magnetic ring.
4. The optical current measuring device as claimed in claim 1, wherein the shielding magnetic ring is made of silicon steel sheet or amorphous alloy material by compression joint.
5. The optical current measurement device of claim 1, wherein the dynamic correction system comprises an optical scale interfaced with a fiber splitter downstream interface.
6. The optical current measuring device of claim 1, wherein the light source is a laser emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011353249.2A CN112362945A (en) | 2020-11-26 | 2020-11-26 | Optical current measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011353249.2A CN112362945A (en) | 2020-11-26 | 2020-11-26 | Optical current measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN112362945A true CN112362945A (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011353249.2A Pending CN112362945A (en) | 2020-11-26 | 2020-11-26 | Optical current measuring device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830265A (en) * | 2012-09-04 | 2012-12-19 | 上海舜宇海逸光电技术有限公司 | Current measurement device |
| CN204314361U (en) * | 2014-11-14 | 2015-05-06 | 国电南京自动化股份有限公司 | A kind of passive electrical type current transformer for integrated-type intelligent isolation circuit breakers |
| CN105548664A (en) * | 2016-02-25 | 2016-05-04 | 江苏思源赫兹互感器有限公司 | Optical current-measurement device |
| CN107765060A (en) * | 2017-09-30 | 2018-03-06 | 广州申畅沃光电科技有限公司 | A kind of crystal magneto-optic valve system for D.C. high-current monitoring |
| CN107765061A (en) * | 2017-09-30 | 2018-03-06 | 广州申畅沃光电科技有限公司 | A kind of optical current measurement apparatus manufactured using crystal light valve sensor |
| CN108802470A (en) * | 2018-06-23 | 2018-11-13 | 南通涵宇新能源电力工程有限公司 | A kind of optical current measuring device |
| CN109490798A (en) * | 2018-09-26 | 2019-03-19 | 上海交通大学 | High temperature superconductor coil Measurement Method for Magnetic Field based on fibre optic magnetic field sensing technology |
-
2020
- 2020-11-26 CN CN202011353249.2A patent/CN112362945A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830265A (en) * | 2012-09-04 | 2012-12-19 | 上海舜宇海逸光电技术有限公司 | Current measurement device |
| CN204314361U (en) * | 2014-11-14 | 2015-05-06 | 国电南京自动化股份有限公司 | A kind of passive electrical type current transformer for integrated-type intelligent isolation circuit breakers |
| CN105548664A (en) * | 2016-02-25 | 2016-05-04 | 江苏思源赫兹互感器有限公司 | Optical current-measurement device |
| CN107765060A (en) * | 2017-09-30 | 2018-03-06 | 广州申畅沃光电科技有限公司 | A kind of crystal magneto-optic valve system for D.C. high-current monitoring |
| CN107765061A (en) * | 2017-09-30 | 2018-03-06 | 广州申畅沃光电科技有限公司 | A kind of optical current measurement apparatus manufactured using crystal light valve sensor |
| CN108802470A (en) * | 2018-06-23 | 2018-11-13 | 南通涵宇新能源电力工程有限公司 | A kind of optical current measuring device |
| CN109490798A (en) * | 2018-09-26 | 2019-03-19 | 上海交通大学 | High temperature superconductor coil Measurement Method for Magnetic Field based on fibre optic magnetic field sensing technology |
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Application publication date: 20210212 |