CN105044568B - The fiber ultrasonic detecting system and detection method of self-adaptation type partial discharge of transformer - Google Patents
The fiber ultrasonic detecting system and detection method of self-adaptation type partial discharge of transformer Download PDFInfo
- Publication number
- CN105044568B CN105044568B CN201510373717.5A CN201510373717A CN105044568B CN 105044568 B CN105044568 B CN 105044568B CN 201510373717 A CN201510373717 A CN 201510373717A CN 105044568 B CN105044568 B CN 105044568B
- Authority
- CN
- China
- Prior art keywords
- acoustic emission
- optical fibre
- circuit
- emission sensor
- switching circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses the fiber ultrasonic detecting system and detection method of self-adaptation type partial discharge of transformer, system includes：The light that C-band tunable laser sources are sent enters Optical Fibre Acoustic Emission Sensor, light is divided into two, respectively enter first, second photoelectric switching circuit, each self-corresponding analog voltage signal is obtained after processing, analog to digital conversion circuit obtains digital voltage signal after being respectively processed to analog voltage signal, it is poor that single-chip microcomputer is made to digital voltage letter, by difference compared with setting voltage range, ensures the difference of digital voltage letter in setting voltage range；Signal after processing is transferred to differential amplifier circuit, signal is given to active filter circuit output after differential amplifier circuit processing.According to the different splitting ratio of different sensors and different optical path losses, the centre wavelength of adjust automatically LASER Light Source, make whole measuring system that there is optimal response and dynamic range, and demodulator circuit is consistent multiplication factor and beneficial to follow-up demarcation and quantifies work.
Description
Technical field
The present invention relates to a kind of online sound emission of optical fiber (20kHz-200kHz) detecting system, more particularly to one kind are adaptive
The fiber ultrasonic detecting system and detection method of type partial discharge of transformer.
Background technology
In the later stage of the service life of power transformer, by realizing lossless audio coding and failure to its state of insulation etc.
Early warning is significant.Partial discharge of transformer is the important means of state-detection, and partial discharge of transformer ultrasound is believed
Number frequency spectrum is wider, and energy mostly concentrates on 20kHz~250kHz frequency ranges.Traditional piezoelectric ceramics class sonac, measurement
Effect, than more serious, and due to needing preamplifier, installation and measurement inconvenience, is realized by electromagnetic interference under strong electric field environment
Long-term on-line measurement has larger difficulty.Comparatively speaking the ultrasonic detecting technology based on optical fiber is advantageously.
The acoustic emission sensor based on optical fiber fused tapering technology reported has that cost is low, simple in construction, not by temperature
The characteristics of spending drift effect.But the coupling period of such a sensor is very long, the static splitting ratio of sensor is caused to be easy to deviate
Preset value, that is, splitting ratio is not 50 when shutting down:50, and splitting ratio differs larger, different sensing between different sensors
Added losses are also inconsistent between device, and the optical path loss in practical application between difference Measurement channel can not be accomplished unanimously in addition,
It is larger so to result in the luminous power difference of sensor two-arm in real work, so each more emat sensor will be adjusted again
Whole quiescent point, have a strong impact on adaptability, sensitivity and the dynamic range of system.
That has reported can realize that automatic gain adjusts by the way of digital regulation resistance, but two during due to practical application
The multiplication factor of individual passage is inconsistent, causes whole measuring system not demarcate.
A kind of voice sending sensor systems based on single-mode optical-fibre coupler of published patent CN201310386525.9 " ",
It can realize that fiber ultrasonic measures by the way of ASE wideband light sources, but due to such light source light spectrum wider range (40nm), survey
It is sensor result average in whole spectral region to measure result, will certainly be reduced compared to sensitivity for narrow-band light source, and
Its sensitivity in a certain certain wave strong point can not be quantified, thus the intersexuality to the measurement of system, demarcation and different sensors
The comparison of energy brings larger difficulty.
If the narrow-band light source of specific wavelength is selected to reach preferably measurement effect according to the transmission characteristic of sensor
Fruit, and can demarcate and contrast, but due between sensor transmission characteristic it is inconsistent, therefore needed once more emat sensor
Light source is changed, this point is also inadvisable.
The content of the invention
The purpose of the present invention is exactly to solve the above problems, there is provided a kind of optical fiber of self-adaptation type partial discharge of transformer
Ultrasonic testing system and detection method, it provide it is a kind of using narrow-band light source and can realize length scanning and lock optical fiber
Sound emission on-line checking scheme.
To achieve these goals, the present invention adopts the following technical scheme that：
The fiber ultrasonic detecting system of self-adaptation type partial discharge of transformer, including：
C-band tunable laser sources, the light that the C-band tunable laser sources are sent enter Optical Fibre Acoustic Emission Sensor,
Light is divided into two by Optical Fibre Acoustic Emission Sensor, respectively enters the first photoelectric switching circuit and the second photoelectric switching circuit,
First photoelectric switching circuit and the second photoelectric switching circuit obtain each after opto-electronic conversion processing is carried out to light
Corresponding analog voltage signal, analog voltage signal are converted to digital voltage signal V1 and V2 by analog to digital conversion circuit, numeral
Voltage signal V1 and V2 are sent into single-chip microcomputer, and it is poor that single-chip microcomputer is made to digital voltage signal V1 and V2, by difference and setting voltage range
It is compared：
If beyond setting voltage range, single-chip microcomputer sends order, C ripples by serial ports to C-band tunable laser sources
Section tunable laser sources adjust the centre wavelength of transmitting light according to order, re-emit optical signal, after repeating the above steps, monolithic
Machine is sampled and compared to the voltage after opto-electronic conversion again by analog to digital conversion circuit, and circulation always is gone down, until numeral
Voltage signal V1 and V2 difference are in setting voltage range；
If difference, in setting voltage range, the first photoelectric switching circuit and the second photoelectric switching circuit are carried out to light
After opto-electronic conversion processing, the signal after processing is all transferred to differential amplifier circuit, sent signal after differential amplifier circuit processing
To active filter circuit, last active filter circuit is by signal output.
The opto-electronic conversion of the C-band tunable laser sources, Optical Fibre Acoustic Emission Sensor, the first photoelectric switching circuit/second
Circuit, analog to digital conversion circuit and single-chip microcomputer constitute closed-loop control, can be according to the different of different Optical Fibre Acoustic Emission Sensors
The centre wavelength of splitting ratio adjust automatically C-band tunable laser sources so that after different Optical Fibre Acoustic Emission Sensor accesses
The quiescent point that can be consistent so that optimal response can be kept after different Optical Fibre Acoustic Emission Sensor accesses and is moved
State scope.
The C-band tunable laser sources (tunalbe laser, UC companies of the U.S.), model GM81022C, wavelength regulation
Scope 1525-1565nm.
The Optical Fibre Acoustic Emission Sensor is the Optical Fibre Acoustic Emission Sensor made using optical fiber fused tapering coupling technique.
The Optical Fibre Acoustic Emission Sensor draws cone mechanism to make with optical fiber, is first fixed for the first time with quartzy V-shaped groove after completing,
Then enclose again in aluminum shell.
The Optical Fibre Acoustic Emission Sensor coupling period is 90, and static splitting ratio is 30:70, added losses 0.5dB.
The fiber ultrasonic detecting system of the self-adaptation type partial discharge of transformer is applied to Partial Discharge in Power Transformer
Caused 20-200khz ultrasonic on-line checking.
A kind of fiber ultrasonic detection method of self-adaptation type partial discharge of transformer, comprises the following steps：
Step (1)：The light for the most long wave strong point that C-band tunable laser sources are sent enters Optical Fibre Acoustic Emission Sensor, light
Light is divided into two by fine acoustic emission sensor, respectively enters the first photoelectric switching circuit and the second photoelectric switching circuit；
Step (2)：First photoelectric switching circuit and the second photoelectric switching circuit obtain after carrying out opto-electronic conversion processing to light
Each self-corresponding analog voltage signal, analog voltage signal are converted to digital voltage signal V1 and V2 by analog to digital conversion circuit,
Digital voltage signal V1 and V2 are sent into single-chip microcomputer, and it is poor that single-chip microcomputer is made to digital voltage signal V1 and V2, by difference and setting voltage
Scope is compared；
Step (3)：According to the comparative result of step (2), if digital voltage signal V1 and V2 difference are in setting voltage
In the range of；After first photoelectric switching circuit and the second photoelectric switching circuit carry out opto-electronic conversion processing to light, all by after processing
Signal is transferred to differential amplifier circuit, and signal is given to active filter circuit, last active power filtering after differential amplifier circuit processing
Circuit is by signal output.
In the step (2), by difference compared with setting voltage range, if beyond setting voltage range, it is single
Piece machine sends order by serial ports to C-band tunable laser sources, and C-band tunable laser sources adjust transmitting light according to order
Centre wavelength；Circulation is gone down always, until digital voltage signal V1 and V2 difference are in setting voltage range.
Beneficial effects of the present invention：
1 has automatic length scanning and lock function due to the demodulation method so that tunable light source is for each biography
Sensor can be locked in sensor on C-band at most sensitive wavelength, so as to ensure to measure by the method for length scanning
System has optimal sensitivity.And rear class demodulator circuit gain is consistent, therefore sensor can be accurately obtained at this wavelength
Sensitivity, and maximum dynamic range can be kept, eliminate that sensor self character is inconsistent and different light paths loss is to surveying
The influence of amount system.
2 this demodulation method can obtain each sensor in tunable optical source scanning optical spectrum by the method for length scanning
Response in scope, you can obtain the optical response of Optical Fibre Acoustic Emission Sensor in the method by electronic surveying, this sound
Should be consistent with measuring the response of Optical Fibre Acoustic Emission Sensor by wideband light source.Every sensor so be can be obtained by c ripples
The response curve of section, foundation is provided for selection sensor.
3 this detecting system realize fiber ultrasonic sensing, and system is also protected after changing the sensor of different static splitting ratios
Optimal sensitivity and dynamic range are held, such a fiber ultrasonic sensor-based system is not charged, essential safety, not by electromagnetic interference, nothing
Preamplifier is needed, is easy to extend, suitable for the long-term on-line checking of shelf depreciation ultrasound of power transformer.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the output spectrum curve of Optical Fibre Acoustic Emission Sensor；Wherein, transverse axis represents wavelength, unit nm, and the longitudinal axis represents
Light intensity, unit dbm；
Fig. 3 is reflectance spectrum when Optical Fibre Acoustic Emission Sensor adds differently strained；Wherein, transverse axis represents wavelength, unit nm, indulges
Axle represents reflectivity, unit dB；
Fig. 4 is response of the optical fiber voice sending sensor system to 100kHz；Wherein, transverse axis represents time, unit S, longitudinal axis generation
Table detecting system exports, unit v.
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
According to the characteristics of tunable laser source, always adjustable laser light is first controlled from big past small adjustment when wavelength adjusts
The light that source is sent is most long wave strong point, and light enters Optical Fibre Acoustic Emission Sensor, and the light after sound wave is modulated is divided into two, respectively
Into two road photoelectric switching circuit processing.The electric signal that single-chip microcomputer converts to two ways of optical signals gathers and according to default respectively
Rule of judgment judged, then no longer adjust if appropriate, if improper adjust tunable laser by serial port command
Wavelength reduces a step-length, then is acquired and judges, so scanning is gone down, untill finding suitable centre wavelength.By
Fig. 2 is visible, and in the range of 1525-1565nm, sensors with auxiliary electrode at least has the consistent wavelength intersection point of 3 amplitudes, i.e. this 3 ripples
It is long to determine one of them.Signal processing circuit carries out differential amplification to two-way light intensity, is then exported through active filter circuit
Final signal.
As shown in figure 1, light is divided into two after the light that it sends enters Optical Fibre Acoustic Emission Sensor, after sound wave is modulated
Optical signal enter the first photoelectric switching circuit and the second photoelectric switching circuit, photoelectric switching circuit is converted to the light received
Voltage V1 and V2, V1 and V2 are converted to data signal by analog-digital converter respectively, then send single-chip microcomputer, single-chip microcomputer is to this direct current
Voltage is compared with default voltage range, if this value is less than normal and two-way value difference is larger, then it is assumed that and this wavelength is improper,
Then single-chip microcomputer sends order by serial ports to tunable laser sources, samples and compares again after increasing a step-length, and always
Circulation is gone down until V1 and V2 enters default scope, and two-way difference is also in default scope.Demodulator circuit can so be ensured
There is a good response, signal is sent into differential amplifier circuit and carries out computing after opto-electronic conversion, is then obtained through active filter circuit
Final signal.
When Optical Fibre Acoustic Emission Sensor is acted on by external sound wave, coupled zone will produce strain, and optical fiber sound emission passes
The transmitted spectrum of sensor two-arm also changes, and understands that the change of luminous power contains the amplitude of acoustic signals according to correlation theory
With the information of frequency.
As shown in figure 3, three curves represent the two-arm of optical fibre ultrasonic sensor in no extraneous strain respectively, 110 it is micro- should
Become, 220 microstrain when light intensity change, it can be seen that 1540nm at, 110 and 220 microstrains bring respectively about 0.8dB with
1.3dB change, acoustic signals can be detected using this change, demodulator circuit is by the change transitions of this transmitted spectrum
For electric signal output.As shown in figure 4, response of the optical fiber voice sending sensor system to 100kHz sine-wave excitations.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (1)
1. the fiber ultrasonic detection method of self-adaptation type partial discharge of transformer, it is characterized in that, comprise the following steps：
Step (1)：The light for the most long wave strong point that C-band tunable laser sources are sent enters Optical Fibre Acoustic Emission Sensor, optical fiber sound
Light is divided into two by emission sensor, respectively enters the first photoelectric switching circuit and the second photoelectric switching circuit；
Step (2)：First photoelectric switching circuit and the second photoelectric switching circuit obtain each after opto-electronic conversion processing is carried out to light
Corresponding analog voltage signal, analog voltage signal are converted to digital voltage signal V1 and V2 by analog to digital conversion circuit, numeral
Voltage signal V1 and V2 are sent into single-chip microcomputer, and it is poor that single-chip microcomputer is made to digital voltage signal V1 and V2, by difference and setting voltage range
It is compared；
Step (3)：According to the comparative result of step (2), if digital voltage signal V1 and V2 difference are in setting voltage range
It is interior；After first photoelectric switching circuit and the second photoelectric switching circuit carry out opto-electronic conversion processing to light, all by the signal after processing
Differential amplifier circuit is transferred to, signal is given to active filter circuit, last active filter circuit after differential amplifier circuit processing
By signal output；
In the step (2), by difference compared with setting voltage range, if beyond setting voltage range, single-chip microcomputer
Order is sent to C-band tunable laser sources by serial ports, C-band tunable laser sources adjust the center of transmitting light according to order
Wavelength；Circulation is gone down always, until digital voltage signal V1 and V2 difference are in setting voltage range；
The C-band tunable laser sources, Optical Fibre Acoustic Emission Sensor, the first photoelectric switching circuit, analog to digital conversion circuit and list
Piece machine constitutes closed-loop control, the C-band tunable laser sources, Optical Fibre Acoustic Emission Sensor, the second photoelectric switching circuit, mould
Number change-over circuit and single-chip microcomputer also constitute closed-loop control, can be according to the different splitting ratios of different Optical Fibre Acoustic Emission Sensors
The centre wavelength of adjust automatically C-band tunable laser sources so that can be kept after different Optical Fibre Acoustic Emission Sensor accesses
Optimal response and dynamic range；
The C-band tunable laser sources, are GM81022C light sources, wavelength regulation scope 1525-1565nm；
The Optical Fibre Acoustic Emission Sensor is the Optical Fibre Acoustic Emission Sensor made using optical fiber fused tapering coupling technique；
The Optical Fibre Acoustic Emission Sensor draws cone mechanism to make with optical fiber, is first fixed for the first time with quartzy V-shaped groove after completing, then
Enclose again in aluminum shell；
The Optical Fibre Acoustic Emission Sensor coupling period is 90, and static splitting ratio is 30:70, added losses 0.5dB；
The fiber ultrasonic detection method of the self-adaptation type partial discharge of transformer causes suitable for Partial Discharge in Power Transformer
20-200khz ultrasonic on-line checking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510373717.5A CN105044568B (en) | 2015-06-30 | 2015-06-30 | The fiber ultrasonic detecting system and detection method of self-adaptation type partial discharge of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510373717.5A CN105044568B (en) | 2015-06-30 | 2015-06-30 | The fiber ultrasonic detecting system and detection method of self-adaptation type partial discharge of transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105044568A CN105044568A (en) | 2015-11-11 |
| CN105044568B true CN105044568B (en) | 2018-04-06 |
Family
ID=54451253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510373717.5A Expired - Fee Related CN105044568B (en) | 2015-06-30 | 2015-06-30 | The fiber ultrasonic detecting system and detection method of self-adaptation type partial discharge of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105044568B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907866B (en) * | 2019-12-13 | 2022-03-22 | 中国人民解放军国防科技大学 | Working point real-time optimization system of giant magneto-impedance sensor and giant magneto-impedance sensor |
| CN113341280A (en) * | 2021-04-29 | 2021-09-03 | 西安交通大学 | Online positioning and monitoring system and method for partial discharge in transformer oil |
| CN114235018B (en) * | 2021-12-09 | 2023-08-08 | 山东微感光电子有限公司 | Temperature-adaptive FBG demodulation method and system |
| CN116754910B (en) * | 2023-08-14 | 2024-01-09 | 广东电网有限责任公司珠海供电局 | Cable partial discharge monitoring method, system and equipment based on multipath optical fiber difference |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201589842U (en) * | 2010-02-03 | 2010-09-22 | 山东电力研究院 | Local discharging optical fiber detection device of transformer |
| CN202372611U (en) * | 2011-12-13 | 2012-08-08 | 山东省科学院激光研究所 | Optical fiber acoustic emission sensor and transformer partial discharge and location online monitoring system |
| CN202420549U (en) * | 2011-12-13 | 2012-09-05 | 山东省科学院激光研究所 | Transformer multi-parameter fiber on-line monitoring system |
| CN103472136A (en) * | 2013-08-30 | 2013-12-25 | 南京航空航天大学 | Acoustic emission sensing system based on single mode fiber coupler |
-
2015
- 2015-06-30 CN CN201510373717.5A patent/CN105044568B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105044568A (en) | 2015-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105044568B (en) | The fiber ultrasonic detecting system and detection method of self-adaptation type partial discharge of transformer | |
| SE9700533L (en) | Variable amplifier optical amplifier | |
| WO2002025232A3 (en) | Wavelength detector and method of detecting wavelength of an optical signal | |
| CN102393987B (en) | Adaptive continuous-wave wide-dynamic-range signal processing method for wide-field full-optical fiber sensing system | |
| CA2062216C (en) | Optical-to-electric transducer with extended dynamic range | |
| US20050200421A1 (en) | Transimpedance amplifier with differential peak detector | |
| WO2022042759A1 (en) | Distributed pulsed optical amplifier based on fiber-optical parametric amplification and amplification and performance characterization methods | |
| CN108362388A (en) | A kind of measurement method of double passage differential laser phase noise | |
| US7742706B2 (en) | Dispersion compensation type optical signal receiving apparatus, receiving circuit, receiving method, and receiving program | |
| CN106160868B (en) | A kind of Raman Fiber Amplifier and its control method for realizing gain dynamic locking | |
| CN105812066A (en) | Method and device for controlling optical receiver, and optical receiver | |
| CN103929139A (en) | Transimpedance pre-amplifier of photo-receiver with high-precision automatic gain control | |
| KR20220013059A (en) | Laser detector based reflector and method for reducing disturbance light noise thereof | |
| CN202750095U (en) | Optical receiver | |
| CN101692123B (en) | Micro-electromechanical microwave loss compensating microwave power detector | |
| CN113295275A (en) | Special shape-adjustable on-chip photoelectric detector | |
| CN108344515A (en) | A kind of measuring device of twin channel laser phase noise | |
| CN114826394B (en) | High-precision large-dynamic-range optical channel attenuation detection system and method | |
| CN113686433B (en) | Photoelectric detector and erbium-doped optical fiber amplifier based on dark current compensation | |
| CN216490515U (en) | Power regulating assembly structure for receiving light | |
| CN203135890U (en) | Light receiver | |
| CN106100754B (en) | A method of it improving DP-QPSK and integrates coherent receiver signal detection isolation | |
| CN101960941A (en) | Laser control land leveling receiver circuit | |
| CN105588587B (en) | Spontaneous brillouin scattering signal extracting device and method based on auto level control | |
| CN102455246B (en) | Low-noise and anti-interference optical-time-domain reflectometer with secondary shielding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160708 Address after: 250101 room 1118, Qilu Software building, Ji'nan hi tech Zone, Shandong Applicant after: Shandong Micro-sensor Photonics Limited Applicant after: China Electric Power Research Institute Applicant after: STATE GRID JIANGSU ELECTRIC POWER COMPANY Address before: 250101 room 1118, Qilu Software building, Ji'nan hi tech Zone, Shandong Applicant before: Shandong Micro-sensor Photonics Limited Applicant before: China Electric Power Research Institute |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180406 Termination date: 20190630 |