CN214585939U - Device for monitoring scale factor of optical fiber current transformer - Google Patents
Device for monitoring scale factor of optical fiber current transformer Download PDFInfo
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- CN214585939U CN214585939U CN202022748744.5U CN202022748744U CN214585939U CN 214585939 U CN214585939 U CN 214585939U CN 202022748744 U CN202022748744 U CN 202022748744U CN 214585939 U CN214585939 U CN 214585939U
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Abstract
The utility model discloses a device for monitoring optic fibre current transformer scale factor belongs to optic fibre current transformer technical field. The utility model discloses the device, include: the device comprises a broadband light source, a coupler, a polarizer, a phase modulator, a delay ring, a wave plate, an optical fiber sensing ring, a wavelength division multiplexer, a state detector, a main detector and a signal processing module. The utility model discloses an optical fiber current transformer light source center wavelength and output optical power's on-line monitoring function to eliminated the light source luminous power decay and influenced the optical fiber current transformer measuring instability, improved mutual-inductor long-term operation reliability.
Description
Technical Field
The utility model relates to an optical fiber current transformer technical field to more specifically relates to a device for monitoring optical fiber current transformer scale factor.
Background
The fundamental principle of an Optical Fiber Current Transformer (FOCT) is based on the Faraday magneto-Optical effect, belongs to an electronic Current Transformer, and the output result of the FOCT is used as an important data source for monitoring and judging the operating state of a power system. According to the national standard of the electronic current transformer, a ratio error (ratio difference) and a phase error (phase difference) are two important indexes for evaluating the accuracy of FOCT measurement. The scaling factor is the ratio of FOCT output to input, and the stability of the FOCT is the most important index for representing the measurement accuracy of the transformer.
During long-term operation of an FOCT, the optical power of the light source is continuously attenuated due to the inherent properties of the semiconductor light source, and the attenuation is accompanied by a shift in the center wavelength, which is a main cause of the change of the FOCT scale factor during long-term operation.
The main object of state monitoring in the existing FOCT is optical power of an optical path, a path of photoelectric detector can be added at the monitoring end of a coupler at the rear stage of a light source, or the judgment can be carried out by directly returning the optical power of a main detector of a system in the FOCT optical path, but no existing scheme exists for monitoring the central wavelength of the light source in the FOCT.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a device for monitoring optic fibre current transformer scale factor, the device includes:
the broadband light source generates and emits optical signals;
the coupler divides an optical signal emitted by the broadband light source into two paths of optical signals to be output;
the polarizer receives a path of optical signal generated linear polarized light emitted by the coupler;
a phase modulator that receives and modulates the line polarization light;
the delay ring transmits the modulated linearly polarized light in a delayed manner and outputs two beams of linearly polarized light which are perpendicular to each other;
the wave plate receives two beams of linearly polarized light which are perpendicular to each other, one beam of the two beams of linearly polarized light which are perpendicular to each other is converted into left-handed polarized light, and the other beam of the two beams of linearly polarized light is converted into right-handed polarized light;
the optical fiber sensing ring and the optical fiber sensor receive left-handed polarized light and right-handed polarized light, and interference light signals in opposite directions generated by the left-handed polarized light and the right-handed polarized light under the action of current are returned to the main detector;
the wavelength division multiplexer receives one path of optical signal output by the coupler, splits the optical signal and transmits the optical signal to the state detector;
the state detector receives the optical signal split by the wavelength division multiplexer, converts the optical signal into an electric signal and collects the electric signal by the signal processing module;
the main detector receives an interference light signal of the optical fiber sensing ring, converts the interference light signal into a voltage signal, and determines the optical power according to the voltage signal;
and the signal processing module is used for acquiring the output voltage signal of the state detector, performing data fitting according to the distribution rule of the acquired voltage signal, calculating the light source central wavelength and the optical power of the optical fiber current transformer, and determining the scale factor of the current transformer according to the light source central wavelength and the optical power.
Optionally, the apparatus further comprises a power module, wherein the power module provides power for the system.
Optionally, the apparatus further comprises: and the upper computer module receives the light source central wavelength and the optical power determined by the signal processing module and carries out online monitoring on the light source central wavelength and the optical power.
Optionally, the apparatus further comprises: and the driving module is used for driving the device to operate.
Optionally, the number of the state detectors is equal to the number of the optical signals split by the wavelength division multiplexer.
Optionally, the coupler is a 2 × 2 coupler.
The utility model discloses an optical fiber current transformer light source center wavelength and output optical power's on-line monitoring function to eliminated the light source luminous power decay and influenced the optical fiber current transformer measuring instability, improved mutual-inductor long-term operation reliability.
Drawings
FIG. 1 is a block diagram of a system for monitoring the scale factor of a fiber optic current transformer of the present invention;
fig. 2 is a graph of the center wavelength and optical power contrast curve of a system for monitoring the scale factor of a fiber optic current transformer.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, which, however, may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of thoroughly and completely disclosing the present invention and fully conveying the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments presented in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The utility model provides a device for monitoring optic fibre current transformer scale factor, as shown in figure 1, include:
the broadband light source generates and emits optical signals;
the coupler divides an optical signal emitted by the broadband light source into two paths of optical signals to be output;
the polarizer receives a path of optical signal generated linear polarized light emitted by the coupler;
a phase modulator that receives and modulates the line polarization light;
the delay ring transmits the modulated linearly polarized light in a delayed manner and outputs two beams of linearly polarized light which are perpendicular to each other;
the wave plate receives two beams of linearly polarized light which are perpendicular to each other, one beam of the two beams of linearly polarized light which are perpendicular to each other is converted into left-handed polarized light, and the other beam of the two beams of linearly polarized light is converted into right-handed polarized light;
the optical fiber sensing ring and the optical fiber sensor receive left-handed polarized light and right-handed polarized light, and interference light signals in opposite directions generated by the left-handed polarized light and the right-handed polarized light under the action of current are returned to the main detector;
the wavelength division multiplexer receives one path of optical signal output by the coupler, splits the optical signal and transmits the optical signal to the state detector;
the state detector receives the optical signal split by the wavelength division multiplexer, converts the optical signal into an electric signal and collects the electric signal by the signal processing module;
the main detector receives an interference light signal of the optical fiber sensing ring, converts the interference light signal into a voltage signal, and determines the optical power according to the voltage signal;
and the signal processing module is used for acquiring the output voltage signal of the state detector, performing data fitting according to the distribution rule of the acquired voltage signal, calculating the light source central wavelength and the optical power of the optical fiber current transformer, and determining the scale factor of the current transformer according to the light source central wavelength and the optical power.
Optionally, the apparatus further comprises a power module, wherein the power module provides power for the system.
Optionally, the apparatus further comprises: and the upper computer module receives the light source central wavelength and the optical power determined by the signal processing module and carries out online monitoring on the light source central wavelength and the optical power.
And the driving module is used for driving the device to operate.
The number of the state detectors is consistent with the number of the light signals split by the wavelength division multiplexer.
The coupler is a 2 x 2 coupler.
The utility model discloses an optical fiber current transformer light source center wavelength and output optical power's on-line monitoring function to eliminated the light source luminous power decay and influenced the optical fiber current transformer measuring instability, improved mutual-inductor long-term operation reliability.
As shown in fig. 1, in the optical path module, light emitted by the broadband light source is divided into two paths after passing through a 2 × 2 coupler;
1/2 light beam output from one port of the coupler is processed by a polarizer to form linear polarized light, the linear polarized light is orthogonally decomposed into two beams of mutually perpendicular linear polarized light by 45-degree welding, the two beams of mutually perpendicular linear polarized light are respectively injected into a fast axis and a slow axis of the polarization-maintaining optical fiber for transmission, and the two beams of mutually perpendicular linear polarized light are transmitted through the modulation effect of the phase modulator and the transmission of the delay optical fiber, two beams of mutually vertical linearly polarized light enter 1/4 wave plates to form a left polarized light and a right polarized light which enter a sensing optical fiber ring, two beams of circularly polarized light generate phase shifts in opposite directions under the action of current and return to a main detector, interference optical signals caused by the current in an optical path are converted into analog electric signals, the analog electric signal is filtered by a signal processing system module II and is subjected to A/D conversion after passing through a preamplifier to realize the demodulation of a digital signal, so that the detection and the output of a current signal are realized, and the current signal is output to an upper computer for displaying through a corresponding communication protocol;
1/2 light beams output by the second coupler port enter the state detector 1, the state detector 2, … … and the state detector k through the light beams obtained after the light beams are split by the wavelength division multiplexer, because a light source device of the optical fiber current transformer usually adopts a wide-spectrum light source, the wavelength division multiplexer divides the light power of the monitoring end of the coupler into k beams, and the k beams of light signals can be regarded as the frequency spectrum division of the wide-spectrum light signals, the sum of the power of the 1-k beams of light signals reflects the light power of the monitoring end of the coupler, and the power distribution of the 1-k beams of light signals can reflect the central wavelength of the light signals output by the coupler end.
As shown in FIG. 2, assuming that the sequence of optical powers detected by the state detector is P [ k ], then Σ P [ k ] can be used to characterize the change in output optical power of the light source, and the sequence of ratios of the powers in P [ k ] compared to some initial value can be used to estimate the center wavelength. The long-term on-line monitoring of the light power and the central wavelength of the light source can be realized by monitoring the light power of all the state detectors, and the self-diagnosis analysis is further carried out by utilizing the monitoring result.
The state detectors 1-k obtain the light power attenuation amplitude of the SLD light source through the signal processing and collecting unit, obtain the scale factor change amplitude caused by light power change according to the pre-fitting function, apply the change coefficient to the signal processing unit of the main detector, correct the scale factor of the optical fiber current transformer, and take the corrected result as the final output of the transformer, thereby realizing the online monitoring and correction of the scale factor in the long-term operation process.
The utility model discloses an optical fiber current transformer light source center wavelength and output optical power's on-line monitoring and self-diagnosis to according to self-diagnosis test result, realize the on-line monitoring of scale factor and correct with oneself, eliminate light source light power decay and to optical fiber current transformer measuring instability influence, improve the mutual-inductor long-term operation reliability.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (6)
1. An apparatus for monitoring a fiber optic current transformer scale factor, the apparatus comprising:
the broadband light source generates and emits optical signals;
the coupler divides an optical signal emitted by the broadband light source into two paths of optical signals to be output;
the polarizer is used for receiving one path of optical signal generated linear polarized light emitted by the coupler;
a phase modulator that receives and modulates the line polarization light;
the delay ring transmits the modulated linearly polarized light in a delayed manner and outputs two beams of linearly polarized light which are perpendicular to each other;
the wave plate is used for receiving two beams of linearly polarized light which are perpendicular to each other, converting one beam of the two beams of linearly polarized light which are perpendicular to each other into levorotatory polarized light, and converting the other beam of the two beams of linearly polarized light into dextrorotatory polarized light;
the optical fiber sensing ring is used for receiving left-handed polarized light and right-handed polarized light and returning interference light signals in opposite directions generated by the left-handed polarized light and the right-handed polarized light under the action of current to the main detector;
the wavelength division multiplexer receives one path of optical signal output by the coupler, splits the optical signal and transmits the optical signal to the state detector;
the state detector receives the optical signal split by the wavelength division multiplexer, converts the optical signal into an electric signal and collects the electric signal by the signal processing module;
the main detector receives an interference light signal of the optical fiber sensing ring, converts the interference light signal into a voltage signal, and determines the optical power according to the voltage signal;
and the signal processing module is used for acquiring the output voltage signal of the state detector, performing data fitting according to the distribution rule of the acquired voltage signal, calculating the light source central wavelength and the optical power of the optical fiber current transformer, and determining the scale factor of the current transformer according to the light source central wavelength and the optical power.
2. The apparatus of claim 1, further comprising a power module that provides power to the apparatus.
3. The apparatus of claim 1, the apparatus further comprising: and the upper computer module receives the light source central wavelength and the optical power determined by the signal processing module and carries out online monitoring on the light source central wavelength and the optical power.
4. The apparatus of claim 1, the apparatus further comprising: and the driving module is used for driving the device to operate.
5. The apparatus of claim 1, the status detector comprising a plurality of status detectors, the number of status detectors corresponding to the number of optical signal splits split by the wavelength division multiplexer.
6. The apparatus of claim 1, the coupler being a 2 x 2 coupler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022748744.5U CN214585939U (en) | 2020-11-24 | 2020-11-24 | Device for monitoring scale factor of optical fiber current transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022748744.5U CN214585939U (en) | 2020-11-24 | 2020-11-24 | Device for monitoring scale factor of optical fiber current transformer |
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| CN214585939U true CN214585939U (en) | 2021-11-02 |
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| CN202022748744.5U Active CN214585939U (en) | 2020-11-24 | 2020-11-24 | Device for monitoring scale factor of optical fiber current transformer |
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