CN119511007A - A partial discharge fault detection method and device based on optical microdisk - Google Patents
A partial discharge fault detection method and device based on optical microdisk Download PDFInfo
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- CN119511007A CN119511007A CN202411871525.2A CN202411871525A CN119511007A CN 119511007 A CN119511007 A CN 119511007A CN 202411871525 A CN202411871525 A CN 202411871525A CN 119511007 A CN119511007 A CN 119511007A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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Abstract
本发明涉及一种基于光学微盘的局部放电故障检测方法及装置，属于故障检测技术领域。包括：发射激光信号；调节激光信号强度，获得适配激光信号；对适配激光信号中特定波长的光信号进行耦合，形成稳定存在的驻波，并获得第一光信号；将第一光信号转换为电信号，并对电信号进行相敏解调，得到声信号的位置信息；根据位置信息，识别和定位局部放电信号。本发明实现了实时在线检测，显著提升了检测效率，同时具备电磁干扰抗性，减少了对大量信息处理的依赖，并缩短了数据处理时间。
The present invention relates to a local discharge fault detection method and device based on an optical microdisk, and belongs to the field of fault detection technology. It includes: emitting a laser signal; adjusting the intensity of the laser signal to obtain an adapted laser signal; coupling an optical signal of a specific wavelength in the adapted laser signal to form a stable standing wave and obtain a first optical signal; converting the first optical signal into an electrical signal, and performing phase-sensitive demodulation on the electrical signal to obtain the position information of the acoustic signal; and identifying and locating the local discharge signal according to the position information. The present invention realizes real-time online detection, significantly improves the detection efficiency, and at the same time has electromagnetic interference resistance, reduces the dependence on large amounts of information processing, and shortens the data processing time.
Description
Technical Field
The invention relates to the technical field of fault detection, in particular to a partial discharge fault detection method and device based on an optical micro-disc.
Background
Distribution transformers are key devices in power distribution systems, and their stable operation is critical to ensuring the reliability of power supply and the safety of the grid. Once the transformer fails, the safety of the power grid is threatened, and huge economic loss can be caused. Currently, many transformers have approached or reached their expected useful life, but due to the lack of effective monitoring means, the potential drawbacks of these aged transformers are often not found in time, increasing the risk of accidents.
In order to prevent such accidents, it is particularly necessary to monitor the operation condition of the transformer in real time and to maintain predictability. Existing transformer detection techniques include pulse current methods and ultra-high frequency detection methods. Although the principle is simple, the pulse current method is an off-line detection mode, is not suitable for real-time monitoring and is easily influenced by electromagnetic interference. The ultrahigh frequency detection rule can realize high-sensitivity online monitoring and defect positioning, but has the problems of overlarge information quantity, long data processing time and low detection efficiency in practical application. In view of this, the existing methods have certain limitations in practical application, and cannot fully meet the requirements of comprehensive and efficient monitoring of the transformer.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that the real-time online detection cannot be realized, the electromagnetic interference is easy to occur, the information quantity is too large, the data processing time is long and the detection efficiency is low in the prior art.
In order to solve the above technical problems, the present invention provides a partial discharge fault detection method based on an optical micro disk, including:
Emitting a laser signal;
adjusting the laser signal intensity to obtain an adaptive laser signal;
Coupling the optical signals with specific wavelengths in the adaptive laser signals to form standing waves which exist stably, and obtaining first optical signals;
Converting the first optical signal into an electric signal, performing phase-sensitive demodulation on the electric signal to obtain the position information of the acoustic signal, and identifying and positioning the partial discharge signal according to the position information.
In one embodiment of the present invention, the method for coupling the optical signal with a specific wavelength in the adaptive laser signal is whispering gallery mode, and the whispering gallery mode includes coupling by using a transmission matrix, and the expression of the transmission matrix is:
Where b 0、b1 and b 2 are output port light energies of different modes of light, a 0、a1 and a 2 are input port light energies of different modes of light, t 0、t1 and t 2 are transmission coefficients between different modes, and j, k 1、k2 and k c are coupling coefficients between different modes.
In one embodiment of the present invention, there is a phase shift between the coupling of the straight waveguide and the loop waveguide during the coupling of the optical signal with a specific wavelength in the adaptive laser signal, and different values of the phase shift range may change the resonance amplitude.
In one embodiment of the present invention, when the range of values of the phase shift is (2 m-0.5) pi < θ < (2m+0.5) pi, the mathematical expression of the resonance amplitude is:
Wherein θ is the phase shift, m is a positive integer, pi is a circumferential rate, j and k c are coupling coefficients between different modes, t 1 and t 2 are transmission coefficients between different modes, b 1 and b 2 are output port light energy of different modes light, alpha 1 and alpha 2 are losses of the micro-disk resonator, AndPhase shift for different whispering gallery modes.
In one embodiment of the present invention, when the range of values of the phase shift is (2m+0.5) pi < θ < (2m+1) pi, the mathematical expression of the resonance amplitude is:
Wherein θ is the phase shift, m is a positive integer, pi is a circumferential rate, j and k c are coupling coefficients between different modes, t 1 and t 2 are transmission coefficients between different modes, b 1 and b 2 are output port light energy of different modes light, alpha 1 and alpha 2 are losses of the micro-disk resonator, AndPhase shift for different whispering gallery modes.
In one embodiment of the present invention, the calculation formula of the phase shift of the different whispering gallery modes is:
Wherein, For the phase shift of the ith whispering gallery mode, i is a positive integer greater than zero, pi is the circumferential rate, R is the radius of the microdisk resonator, n eff_i is the effective refractive index corresponding to the ith whispering gallery mode, and λ is the wavelength in vacuum.
In one embodiment of the invention, the laser signal is a narrow linewidth laser signal.
In a second aspect, to solve the above technical problem, the present invention provides a partial discharge fault detection device based on an optical micro disk, including:
a tunable laser for emitting a laser signal;
The attenuator is connected with the tunable laser by utilizing a multimode optical fiber and is used for adjusting the laser signal intensity to obtain an adaptive laser signal;
The at least one micro-disk resonator is connected with the attenuator by utilizing an optical fiber and is used for coupling optical signals with specific wavelengths in the adaptive laser signals to form standing waves which exist stably and obtain first optical signals;
The photoelectric detector is connected with the at least one micro-disc resonator by utilizing a single-mode fiber and is used for converting the first optical signal into an electric signal;
And the signal acquisition module is directly connected with the photoelectric detector and is used for carrying out phase-sensitive demodulation on the electric signals to obtain the position information of the acoustic signals.
In one embodiment of the invention, each of the microdisk resonators includes a straight waveguide and a polymer cladding.
In one embodiment of the invention, a plurality of the micro-disk resonators are distributed at equal intervals on the front surface and the side surface of the transformer to form a micro-disk resonator array.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) The method and the device for detecting the partial discharge fault based on the optical microdisk realize real-time online monitoring of the partial discharge signal by utilizing the instant response characteristic of the laser signal so as to quickly identify and prevent potential equipment faults. In particular, the present invention is excellent in an environment sensitive to electromagnetic interference, and exhibits excellent environmental suitability. By precisely coupling optical signals of specific wavelengths to form a stable standing wave, the present method ensures the stability and reliability of signal processing. In addition, the invention can rapidly complete the detection task, greatly reduce the waiting time, avoid the requirement of processing a large amount of information and effectively improve the working efficiency. Further, by converting the laser signal into the electric signal and performing demodulation operation, the invention can accurately position the acoustic signal, thereby realizing accurate identification and positioning of the partial discharge signal.
(2) The micro-disk resonator provided by the invention adopts the polymer material as the substrate to replace the original silicon substrate so as to form the all-polymer waveguide micro-disk resonator, thereby eliminating the problem of resonance wavelength drift. Compared with the traditional piezoelectric ceramic hydrophone, the device has the advantages of good electromagnetic compatibility, good insulation level, high acoustic sensitivity, wide frequency response and high durability.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which
FIG. 1 is a flow chart of a partial discharge fault detection method based on an optical micro-disc in a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a microdisk resonator according to a preferred embodiment of the invention;
FIG. 3 is a block diagram of a partial discharge fault detection device based on an optical microdisk in a preferred embodiment of the invention;
FIG. 4 is a graph showing transmission curves of a microdisk resonator in accordance with a preferred embodiment of the invention;
Fig. 5 is a cross-sectional view of a microdisk resonator in accordance with a preferred embodiment of the invention.
The reference numerals of the specification show that 1, a tunable laser, 2, an attenuator, 3, a micro-disk resonator, 4, a photoelectric detector, 5, a signal acquisition module, 6, a straight waveguide and 7, a polymer cladding.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a partial discharge fault detection method based on an optical micro disk, including:
Emitting a laser signal;
Adjusting the intensity of the laser signal to obtain an adaptive laser signal;
Coupling an optical signal with a specific wavelength in the adaptive laser signal to form a standing wave which exists stably, and obtaining a first optical signal;
Converting the first optical signal into an electric signal, and performing phase-sensitive demodulation on the electric signal to obtain the position information of the acoustic signal;
based on the position information, partial discharge signals are identified and located.
The embodiment of the invention provides a partial discharge fault detection method based on an optical micro-disc, which utilizes the quick response capability of a laser signal to realize real-time on-line monitoring of a partial discharge signal, effectively prevents and quickly identifies potential equipment faults and has electromagnetic interference resistance. By coupling optical signals of specific wavelengths to form stable standing waves, high stability and reliability of signal processing are ensured. The embodiment of the invention can rapidly execute the detection task, obviously shortens the waiting time, avoids the requirement of processing a large amount of information, and effectively improves the working efficiency. In addition, by converting the laser signal into an electric signal and carrying out demodulation operation, the method can accurately capture the position information of the acoustic signal, realize the accurate identification and positioning of the partial discharge signal, and comprehensively and efficiently meet the requirement of transformer monitoring.
Specifically, a method of coupling an optical signal of a specific wavelength in an adapted laser signal is a whispering gallery mode. Whispering gallery modes refer to multiple reflections of light waves at the inner surface of an optical microresonator (e.g., microsphere or microdisk) to form a particular resonant mode. From the perspective of the microdisk resonator, the modes can be divided into two types, an outer whispering gallery mode outside the disk (mode 1) and an inner whispering gallery mode inside the disk (mode 2). In this embodiment, the two modes work together to form a 3 x 3 coupler. As shown in fig. 2, the whispering gallery modes coupling process involves the use of a transmission matrix to achieve efficient coupling of light waves. The expression of the transmission matrix is as follows:
Where b 0、b1 and b 2 are output port light energies of different modes of light, a 0、a1 and a 2 are input port light energies of different modes of light, t 0、t1 and t 2 are transmission coefficients between different modes, and j, k 1、k2 and k c are coupling coefficients between different modes.
Further, there is a phase shift θ between the coupling of the straight waveguide and the loop waveguide during the coupling of the optical signal with a specific wavelength in the adapted laser signal, the calculation formula is
θ=2π2Rneff/λ; (2)
Where pi is the circumference ratio, R is the radius of the microdisk resonator, n eff is the effective refractive index corresponding to whispering gallery modes, and λ is the wavelength in vacuum.
Further, since the resonance amplitude of the micro-disc resonator is affected by different phase shift values, this means that the variation range of the phase shift directly changes the resonance response of the resonator. In this embodiment, when the range of the value of the phase shift θ is (2 m-0.5) pi < θ < (2m+0.5) pi, the mathematical expression of the resonance amplitude is:
when the range of the phase shift is (2m+0.5) pi < theta < (2m+1) pi, the mathematical expression of the resonance amplitude is:
Wherein θ is the phase shift, m is a positive integer, j and k c are coupling coefficients between different modes, t 1 and t 2 are transmission coefficients between different modes, b 1 and b 2 are output port optical energy of different modes of light, a 1 and a 2 are losses of the microdisk resonator, AndPhase shift for different whispering gallery modes.
Further, for the phase shift of different whispering gallery modes, the calculation formula is:
Wherein, For the phase shift of the i-th whispering gallery mode, i is a positive integer greater than zero, in this example the value of i is 1 or 2;n eff_i is the effective refractive index corresponding to the i-th whispering gallery mode, and λ is the wavelength in vacuum.
In practical application, the high-Q micro-disk resonator has transmission characteristics and phase shift near the resonance pointVery sensitive, which is closely related to the refractive index n eff_i of the medium. The weak change caused by the deformation of the waveguide is greatly amplified in the high-Q micro-disk resonator, so that the sensitivity to sound pressure is greatly improved. This means that even small environmental changes, such as pressure changes caused by sound waves, can be effectively detected by the microdisk resonator.
Further, when the straight waveguide is coupled to the micro-disk resonator disk guide, equations (3) and (4) can be simplified as:
Where S t is a transfer function, a 0 and b 0 are optical energy of the input and output port modes of the straight waveguide, and t 0 is a transfer coefficient, specifically representing transmission loss from the straight waveguide to the microdisk.
In the embodiment, the whispering gallery mode is used for coupling the optical signals with the specific wavelengths in the adaptive laser signals, so that the optical signals with the specific wavelengths can be effectively limited in the micro-disk resonator, and efficient energy storage and resonance enhancement of light waves are realized. The coupling mode not only improves the quality and strength of the signal, but also greatly enhances the sensitivity to the optical signal due to the high Q factor of the whispering gallery mode.
Specifically, the phase-sensitive demodulation is performed on the electric signal, and the phase-sensitive demodulation step comprises rectification detection, phase-sensitive detection and matched filtering, and the filtered signal can reflect acoustic signal information. In this embodiment, the phase-sensitive demodulation method is not limited, and may be selected according to practical application requirements.
Example two
Based on the same inventive concept, the present embodiment provides a partial discharge fault detection device based on an optical micro disk, and the principle of solving the problem is similar to that of the partial discharge fault detection method based on the optical micro disk provided in the first embodiment, and the repetition is not repeated.
Referring to fig. 3, the present embodiment provides a partial discharge fault detection device based on an optical micro disk, including:
a tunable laser 1 for emitting a laser signal;
the attenuator 2 is connected with the tunable laser 1 by utilizing a multimode optical fiber and is used for adjusting the intensity of a laser signal to obtain an adaptive laser signal;
At least one micro-disk resonator 3 connected with the attenuator 2 by an optical fiber for coupling an optical signal of a specific wavelength in the adaptive laser signal to form a standing wave which exists stably and obtain a first optical signal;
A photodetector 4 connected to the at least one micro-disc resonator 3 by a single-mode optical fiber for converting the first optical signal into an electrical signal;
and the signal acquisition module 5 is directly connected with the photoelectric detector 4 and is used for carrying out phase-sensitive demodulation on the electric signals to obtain the position information of the acoustic signals.
The embodiment realizes the real-time on-line detection of the partial discharge signals of the device through the tunable laser 1, the attenuator 2, the micro-disc resonator 3, the photoelectric detector 4 and the signal acquisition module 5. Wherein the connection of the tunable laser 1 and the attenuator 2 allows to precisely control the intensity and wavelength of the emitted laser signal to adapt to different detection requirements. The signal acquisition module 5 is directly connected with the photoelectric detector 4, so that delay in the signal transmission process is reduced, and the data processing speed is increased. In addition, the connection of the optical fibers reduces electromagnetic interference and improves the stability and reliability of signal transmission.
In particular, the present embodiment employs narrow linewidth laser signals, which play a critical role in a plurality of critical fields such as optical interference, optical communication, precision measurement, quantum technology, etc., due to their excellent coherence, high spectral purity, system stability, and long coherence length. In addition, the narrow linewidth laser signals have strong electromagnetic interference resistance and support remote control functions, which enable them to maintain high performance and accurate operation even in complex and diverse environments. Thus, in the present embodiment, the tunable laser 1 is configured to emit a narrow linewidth laser signal whose wavelength scanning range is set between 1.5 micrometers and 1.6 micrometers to optimize the coupling efficiency with the micro-disk resonator 3. The transmission characteristics of the microdisk resonator 3 are shown in fig. 4.
Specifically, the attenuator 2 adjusts the intensity of the laser signal by means of a multimode optical fiber connected to the tunable laser 1, thereby obtaining an adapted laser signal. This process involves a precise programmed adjustment, and the attenuator 2 can vary the loss of the optical signal in the transmission path to achieve flexible control of the optical intensity. Multimode optical fibers are particularly suitable for the transmission of high-power optical signals because of their ability to transmit optical signals in multiple modes. In this way, the attenuator 2 is able to adapt to specific demands of different application scenarios for laser signal strength, ensuring that the optical signal achieves optimal performance in subsequent optical sensing and signal processing applications. In the present embodiment, the intensity of the laser signal transmitted by the attenuator 2 is adapted to the micro disk resonator 3.
During operation of the distribution transformer, the acoustic signal generated by the partial discharge has specific spectral characteristics, the frequency of which is mainly concentrated between 20kHz and 400 kHz. In transformer oil, the corresponding wavelengths of these acoustic signals are between about 7.5 cm and 3.75 mm. There is a linear relationship between the sound pressure level of the partial discharge and the amount of discharge, a characteristic that is critical for monitoring and diagnosing the health of the transformer. In order to accurately capture these acoustic signals, the micro-disk resonator 3 needs to have high sensitivity, a wide dynamic range, and an excellent signal-to-noise ratio. These performance parameters ensure that the microdisk resonator 3 is able to effectively detect weak acoustic waves generated by partial discharge and convert them into an analyzable electrical signal. In transformer oil, the principle of operation of the micro-disc resonator 3 is based mainly on physical effects caused by sound pressure. When acoustic waves propagate through transformer oil, they cause a slight deformation of the micro-disc resonator 3, a phenomenon called acoustic pressure induced deformation. At the same time, the acoustic wave also causes photoelastic changes, i.e. photoelastic effects, of the material. Among polystyrene, the photoelastic effect is particularly pronounced, which enables the microdisk resonator 3 to reflect the presence and intensity of sound waves through changes in the optical signal.
Specifically, when the micro-disc resonator 3 is placed inside the distribution transformer in the actual operation environment (large temperature difference operation) of the distribution transformer, the micro-disc resonator 3 is susceptible to resonance wavelength drift due to the influence of the operation temperature, and the micro-disc resonator 3 adopts a polymer material as a substrate to replace the original silicon substrate so as to form the all-polymer waveguide micro-disc resonator 3, thereby eliminating the resonance wavelength drift problem. Referring to fig. 5, the micro disk resonator 3 includes a straight waveguide 6 and a polymer cladding 7, and the polymer cladding 7 is used to isolate the sensor from transformer oil, so as to avoid the influence of the transformer oil on the sensor structure and improve the signal-to-noise ratio of the system. The device in this embodiment uses electron beam etching and nanoimprint technology, and the nanoimprint technology can reduce the manufacturing cost of the micro-disc resonator 3.
Further, for the material of the micro disk resonator 3, polystyrene, a silica insulating layer, and a polymer clad layer 7 may be included. Compared with the traditional piezoelectric ceramic hydrophone, the piezoelectric ceramic hydrophone has the advantages of good electromagnetic compatibility, good insulation level, high acoustic sensitivity, wide frequency response, high durability and the like. The micro-disk resonator 3 has practical significance for use in a large temperature change scenario. The invention can be widely applied to the identification and positioning of partial discharge phenomena of transformers of various types, can be used for preventing turn-to-turn short circuit and inter-strand short circuit accidents caused by insulation degradation in advance in actual production, and can avoid transformer explosion accidents caused by insulation defects.
Specifically, the micro-disc resonator 3 has flexible installation options, and can be either built inside the transformer or externally arranged outside the transformer. These microdisk resonators 3 form an array (which may be referred to as an array of microdisk resonators) that are placed on an insulating material to ensure a safe distance from the windings of the transformer and the tank wall from electromagnetic interference. The array of microdisk resonators are arranged in equidistant fashion on the front and sides of the transformer, forming an effective acoustic wave receiving network. In this embodiment, 3-6 micro disk resonators 3 are arranged equidistantly on the front side and 3-6 micro disk resonators 3 are arranged equidistantly on the side for maximally capturing the direct stress wave signal generated by the partial discharge event inside the transformer. Through the array designed in the way, the sensitivity and coverage range of signal receiving can be obviously improved, so that the real-time monitoring and accurate diagnosis of the state of the transformer are realized. The innovative arrangement mode not only enhances the reliability of the detection device, but also provides powerful support for the maintenance and fault prevention of the transformer.
Further, when the packaged micron-sized micro-disc resonator 3 is fixed in the transformer oil tank, when partial discharge occurs in the distribution transformer, a high-frequency sound signal of 20kHz to 400kHz is generated, and stress waves generated by receiving the sound signal act on the array time interval of the distributed micro-disc resonator and the position information of the micro-disc, so that the position information of partial discharge can be positioned without artifacts.
In the device provided in this embodiment, the signal acquisition module 5 further includes an upper computer. When the electric signal processed by the photoelectric detector 4 is directly transmitted to the signal acquisition module 5, the electric signal is acquired and processed by the upper computer. The design ensures the accuracy and the real-time performance of data, and improves the efficiency and the reliability of signal acquisition.
It will be appreciated by those skilled in the art that 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 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The partial discharge fault detection method based on the optical micro disk is characterized by comprising the following steps of:
Emitting a laser signal;
adjusting the laser signal intensity to obtain an adaptive laser signal;
Coupling the optical signals with specific wavelengths in the adaptive laser signals to form standing waves which exist stably, and obtaining first optical signals;
Converting the first optical signal into an electric signal, performing phase-sensitive demodulation on the electric signal to obtain the position information of the acoustic signal, and identifying and positioning the partial discharge signal according to the position information.
2. The method for detecting partial discharge faults based on optical microdisks according to claim 1, wherein the method for coupling optical signals of specific wavelengths in the adaptive laser signals is a whispering gallery mode, the whispering gallery mode includes coupling by using a transmission matrix, and the expression of the transmission matrix is:
Where b 0、b1 and b 2 are output port light energies of different modes of light, a 0、a1 and a 2 are input port light energies of different modes of light, t 0、t1 and t 2 are transmission coefficients between different modes, and j, k 1、k2 and k c are coupling coefficients between different modes.
3. The method for detecting partial discharge faults based on optical microdisks according to claim 1 or 2, wherein in the process of coupling optical signals with specific wavelengths in the adaptive laser signals, there is a phase shift coupled between a straight waveguide and a loop waveguide, and the resonance amplitude is changed by different value ranges of the phase shift.
4. The method for detecting partial discharge faults based on optical microdisks according to claim 3, wherein when the value range of the phase shift is (2 m-0.5) pi < theta < (2m+0.5) pi, the mathematical expression of the resonance amplitude is:
Wherein θ is the phase shift, m is a positive integer, pi is a circumferential rate, j and k c are coupling coefficients between different modes, t 1 and t 2 are transmission coefficients between different modes, b 1 and b 2 are output port light energy of different modes light, alpha 1 and alpha 2 are losses of the micro-disk resonator, AndPhase shift for different whispering gallery modes.
5. The method for detecting partial discharge faults based on optical microdisks according to claim 3, wherein when the value range of the phase shift is (2m+0.5) pi < θ < (2m+1) pi, the mathematical expression of the resonance amplitude is:
Wherein θ is the phase shift, m is a positive integer, pi is a circumferential rate, j and k c are coupling coefficients between different modes, t 1 and t 2 are transmission coefficients between different modes, b 1 and b 2 are output port light energy of different modes light, alpha 1 and alpha 2 are losses of the micro-disk resonator, AndPhase shift for different whispering gallery modes.
6. The method for detecting partial discharge failure based on optical microdisk according to claim 4 or 5, wherein the calculation formula of the phase shift of different whispering gallery modes is:
Wherein, For the phase shift of the ith whispering gallery mode, i is a positive integer greater than zero, pi is the circumferential rate, R is the radius of the microdisk resonator, n eff_i is the effective refractive index corresponding to the ith whispering gallery mode, and λ is the wavelength in vacuum.
7. The method for detecting partial discharge failure based on an optical micro-disc according to claim 1, wherein the laser signal is a narrow linewidth laser signal.
8. An optical microdisk-based partial discharge failure detection device, comprising:
a tunable laser for emitting a laser signal;
The attenuator is connected with the tunable laser by utilizing a multimode optical fiber and is used for adjusting the laser signal intensity to obtain an adaptive laser signal;
The at least one micro-disk resonator is connected with the attenuator by utilizing an optical fiber and is used for coupling optical signals with specific wavelengths in the adaptive laser signals to form standing waves which exist stably and obtain first optical signals;
The photoelectric detector is connected with the at least one micro-disc resonator by utilizing a single-mode fiber and is used for converting the first optical signal into an electric signal;
And the signal acquisition module is directly connected with the photoelectric detector and is used for carrying out phase-sensitive demodulation on the electric signals to obtain the position information of the acoustic signals.
9. The optical microdisk-based partial discharge failure detection apparatus of claim 8, wherein each of said microdisk resonators includes a straight waveguide and a polymer cladding.
10. The optical microdisk-based partial discharge failure detection apparatus according to claim 8, wherein a plurality of the microdisk resonators are equally spaced on the front and side of the transformer to form an array of microdisk resonators.
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