CN105717129A - Basin-type insulator crack detector based on fiber gratings - Google Patents
Basin-type insulator crack detector based on fiber gratings Download PDFInfo
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- CN105717129A CN105717129A CN201610224991.0A CN201610224991A CN105717129A CN 105717129 A CN105717129 A CN 105717129A CN 201610224991 A CN201610224991 A CN 201610224991A CN 105717129 A CN105717129 A CN 105717129A
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- fiber
- fiber grating
- crackle
- disc insulator
- gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
Abstract
The invention discloses a basin-type insulator crack detector based on fiber gratings. The basin-type insulator crack detector is characterized by comprising a broadband laser, six fiber gratings connected in series to one optical fiber, a fiber grating demodulation module and an A/D (analog to digital) sampling and processor module, wherein the six fiber gratings connected in series to one optical fiber are circularly bonded to the periphery of a basin-type insulator, one end of the optical fiber is accessed to the broadband laser, the other end of the optical fiber is connected with the fiber grating demodulation module, an output signal of the fiber grating demodulation module is accessed to the A/D sampling and processor module, and the A/D sampling and processor module acquires sampled data by an A/D sampler and uses a processor to perform signal judgment on the sampled data; the cracks are detected by changing the central wavelengths of the six fiber gratings.
Description
Technical field
The present invention relates to disc insulator crack detection technical field, more specifically a kind of disc insulator crackle on-line measuring device.
Background technology
For the crack detection of disc insulator, the detection especially for crackle is extremely difficult, currently mainly has ultrasonic and ultra-high-frequency detection method.
Ultrasound detection be by ultrasound echo signal detect crackle whether exist, this detection method has certain limitation, and the diameter of disc insulator is relatively larger, ultrasonic interior insulator decay quickly, the ultrasonic whole insulator of very difficult transmission, therefore detect not comprehensive.
Hyperfrequency is the crackle by the detection of shelf depreciation comes indirect detection disc insulator, in time there is crackle in disc insulator, high-tension electricity can produce electric spark at crack position, namely partial discharge phenomenon is produced, shelf depreciation can produce high-frequency signal, namely can detect that the crackle of disc insulator by catching this high-frequency signal.The method there is also certain limitation, under actual motion environment, along with insulation degradation, has the simultaneous situation of multiple discharge type, it is necessary to explores how to separate the unlike signal tested.Outer sensor is placed on on-the-spot disc insulator device external when testing, and without good shield effectiveness, the signal received can be subject to the impact of outside electromagnetic interference, and not easily carries out long-term stationary monitoring.Many electric discharges within disc insulator are not long-time existence, can cause the electric discharge over the ground of chopper while there is electric discharge, and the seizure of local discharge signal is extremely difficult.Conventional substantial amounts of research shows, current detection still cannot determine the Apparent discharge magnitude of device interior fault, but for the shelf depreciation detecting equipment, the size of Apparent discharge magnitude is almost indispensable standard, also determines that the standard of the apparatus insulated situation order of severity.
Summary of the invention
The present invention is for avoiding the weak point existing for above-mentioned prior art, it is provided that a kind of can the disc insulator crackle detecting instrument based on fiber grating of fine crack of on-line checking disc insulator.
The present invention solves that technical problem adopts the following technical scheme that
The present invention based on fiber grating disc insulator crackle detecting instrument be structurally characterized in that six fiber gratings, fiber grating demodulation module, A/D sampling and the processor module that described detector includes wideband laser, is connected on an optical fiber；Described six fiber gratings being connected on an optical fiber paste a circle along the periphery of disc insulator, described optical fiber one end access band laser instrument, the other end connects fiber grating demodulation module, the output signal of described fiber grating demodulation module accesses A/D sampling and processor module, described A/D sampling and processor module utilize A/D sampler to obtain the sampled data through data conversion, and utilize processor that described sampled data is carried out signal judgement；
When due to reasons such as technique, pressure, shelf depreciations, disc insulator causes that it cracks, the stress wave propagation that cracking moment produces is to the external diameter surface of disc insulator, and affect refractive index and the cycle of fiber grating, thus change the centre wavelength of fiber grating；The detection to crackle is realized by the change of six fiber bragg grating center wavelengths being carried out detection.
The present invention lies also in based on the construction features of the disc insulator crackle detecting instrument of fiber grating: arranging described six fiber grating offices on the position that described disc insulator periphery is different, the time detected according to each fiber grating and signal intensity judge position and the intensity of crackle.
The present invention lies also in based on the construction features of the disc insulator crackle detecting instrument of fiber grating: arranges described six fiber gratings and mutually has different centre wavelength, six fiber gratings are equidistantly distributed in the periphery of disc insulator, adopt wavelength-division multiplex principle to the signal demodulation respectively of each fiber grating, determine crackle region according to the wavelength shift of different fiber gratings.
The present invention lies also in based on the construction features of the disc insulator crackle detecting instrument of fiber grating: utilize processor that described sampled data is carried out signal judgement, calculate the side-play amount of the centre wavelength obtaining fiber grating, and the shift time of centre wavelength, the cracking degree producing position, time and crackle of crackle is determined according to side-play amount and shift time.
Compared with the prior art, the present invention has the beneficial effect that:
When due to reasons such as adaptability to changes, temperature, pressure, shelf depreciations, disc insulator causes that it cracks, the stress wave that cracking moment produces can propagate the external diameter surface of disc insulator, thus have impact on the refractive index of fiber grating and cycle, and then change the centre wavelength of fiber grating, the present invention detection by six fiber bragg grating center wavelengths are changed, detect the generation of crackle, and position and the intensity of crackle can be judged according to the time and intensity detected of different fiber gratings.Can be used for the fine crack of on-line checking disc insulator, its simple in construction, detection method are simple and reliable
Accompanying drawing explanation
Fig. 1 is the system block diagram of the present invention；
Fig. 2 is the stress wave schematic diagram during generation of disc insulator crackle；
Fig. 3 is A/D sampling and processor module theory diagram in the present invention；
Fig. 4 is the crack detection algorithm flow chart applied in the present invention；
Detailed description of the invention
Referring to Fig. 1 and Fig. 2, six fiber gratings, fiber grating demodulation module, A/D sampling and the processor module that in the present embodiment, the disc insulator crackle detecting instrument based on fiber grating includes wideband laser, is connected on an optical fiber；It is connected on six fiber gratings on an optical fiber and pastes a circle along the periphery of disc insulator, optical fiber one end access band laser instrument, the other end connects fiber grating demodulation module, the output signal of fiber grating demodulation module accesses A/D sampling and processor module, A/D sampling and processor module utilize A/D sampler to obtain the sampled data through data conversion, and utilize processor that sampled data is carried out signal judgement；
When due to reasons such as technique, pressure, shelf depreciations, disc insulator causes that it cracks, the stress wave propagation that cracking moment produces is to the external diameter surface of disc insulator, and affect refractive index and the cycle of fiber grating, thus change the centre wavelength of fiber grating；The detection to crackle is realized by the change of six fiber bragg grating center wavelengths being carried out detection.
In being embodied as, arranging six fiber grating offices on the position that disc insulator periphery is different, the time detected according to each fiber grating and signal intensity judge position and the intensity of crackle.Six fiber gratings are set there is different centre wavelength mutually, six fiber gratings are equidistantly distributed in the periphery of disc insulator, adopt wavelength-division multiplex principle to the signal demodulation respectively of each fiber grating, determine crackle region according to the wavelength shift of different fiber gratings.
Utilize processor that sampled data carries out signal judgement, calculate the side-play amount of the centre wavelength obtaining fiber grating and the shift time of centre wavelength, determine the cracking degree producing position, time and crackle of crackle according to side-play amount and shift time.
Shown in Cleaning Principle: Fig. 1 and Fig. 2 six fiber grating is the first fiber grating the 1, second fiber grating the 2, the 3rd fiber grating the 3, the 4th fiber grating the 4, the 5th fiber grating 5 and six fibers grating 6 successively；Six fibers grating each has different centre wavelength, the light that wideband laser sends optical signal of six centre wavelengths through fiber grating time is launched, and can obtain six centre wavelength numerical value through fiber grating demodulation module, A/D sampling with signal processor module.When disc insulator 7 has crackle to produce time, crackle sends stress wave can be transferred to fiber grating, as in figure 2 it is shown, be stressed wave action, fiber bragg grating center wavelength can produce to change, and can substantially determine Crack Strength and crack position according to this change.Crack Strength is more big, and centre wavelength changes more big；From the fiber grating that crackle is nearest, fiber bragg grating center wavelength changes maximum, can substantially infer crack position accordingly.
Referring to Fig. 3, A/D sampling is utilize the analogue signal that fiber grating demodulation module is exported by charge amplifier to be amplified with signal processor module, by the first wave filter filtering noise signal, recycling programmable amplifier is amplified, the amplification of programmable amplifier can carry out exterior arrangement by button, amplitude according to analogue signal sets amplification, makes A/D sampler can carry out full scale sampling；Amplifying signal and obtain filtering acquisition A/D sampled signal again in the second wave filter, single-chip microcomputer STM32, as signal processor, utilizes signal processor that the data gathered are calculated and are processed, and result displays in a lcd display.
Referring to Fig. 4, the flow process of crack detection algorithm is as follows: first carry out A/D sampling, sampled data compares with the threshold value preset, if sampled data is less than default threshold value, it is judged as that sampled data is external disturbance signal, it it is not disc insulator Signal of Cracks, if sampled data is more than default threshold value, then experimental empirical value judges Crack Strength, the relatively size of the deviant of the centre wavelength of six fiber gratings, the maximum grating of deviant is nearest from crackle, the minimum fiber grating of deviant is farthest from crackle, draw the approximate location of disc insulator crackle in LCD screen according to result of calculation, and determine whether alarm according to Crack Strength.
Claims (4)
1., based on a disc insulator crackle detecting instrument for fiber grating, it is characterized in that six fiber gratings, fiber grating demodulation module, A/D sampling and processor module that described detector includes wideband laser, is connected on an optical fiber；Described six fiber gratings being connected on an optical fiber paste a circle along the periphery of disc insulator, described optical fiber one end access band laser instrument, the other end connects fiber grating demodulation module, the output signal of described fiber grating demodulation module accesses A/D sampling and processor module, described A/D sampling and processor module utilize A/D sampler to obtain sampled data, and utilize processor that described sampled data is carried out signal judgement；
When due to reasons such as technique, pressure, shelf depreciations, disc insulator causes that it cracks, the stress wave propagation that cracking moment produces is to the external diameter surface of disc insulator, and affect refractive index and the cycle of fiber grating, thus change the centre wavelength of fiber grating；The detection to crackle is realized by the change of six fiber bragg grating center wavelengths being carried out detection.
2. the disc insulator crackle detecting instrument based on fiber grating according to claim 1, it is characterized in that: arranging described six fiber grating offices on the position that described disc insulator periphery is different, the time detected according to each fiber grating and signal intensity judge position and the intensity of crackle.
3. the disc insulator crackle detecting instrument based on fiber grating according to claim 2, it is characterized in that: described six fiber gratings are set there is different centre wavelength mutually, six fiber gratings are equidistantly distributed in the periphery of disc insulator, adopt wavelength-division multiplex principle to the signal demodulation respectively of each fiber grating, determine crackle region according to the wavelength shift of different fiber gratings.
4. the disc insulator crackle detecting instrument based on fiber grating according to claim 3, it is characterized in that: utilize processor that described sampled data is carried out signal judgement, calculate the side-play amount of the centre wavelength obtaining fiber grating, and the shift time of centre wavelength, the cracking degree producing position, time and crackle of crackle is determined according to side-play amount and shift time.
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| CN201610224991.0A CN105717129A (en) | 2016-04-12 | 2016-04-12 | Basin-type insulator crack detector based on fiber gratings |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060546A (en) * | 2018-08-29 | 2018-12-21 | 西安交通大学 | It is a kind of using optical-fibre needle to the strain gauge means and method of the disc insulator water pressure test |
| CN110780171A (en) * | 2019-11-13 | 2020-02-11 | 合肥工业大学 | Online state detection system of GIS basin-type insulator based on fiber bragg grating |
| CN112582114A (en) * | 2020-11-24 | 2021-03-30 | 华南理工大学 | Composite insulator and method for detecting composite insulator brittle failure based on fiber bragg grating |
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| WO2005024349A1 (en) * | 2003-09-08 | 2005-03-17 | Donam Systems Inc. | Fiber bragg grating sensor system |
| CN101769442A (en) * | 2010-01-18 | 2010-07-07 | 大连理工大学 | Method for monitoring pipeline corrosion |
| CN103017804A (en) * | 2012-12-26 | 2013-04-03 | 中国科学院上海光学精密机械研究所 | High-time-synchronization multichannel fiber bragg grating sensing system |
| CN104808125A (en) * | 2015-05-04 | 2015-07-29 | 华北电力大学 | System for detecting local discharge in transformer oil on basis of fiber Bragg grating |
| CN205562415U (en) * | 2016-04-12 | 2016-09-07 | 国家电网公司 | Benzvalene form insulator crack detection appearance based on fiber grating |
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2016
- 2016-04-12 CN CN201610224991.0A patent/CN105717129A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005024349A1 (en) * | 2003-09-08 | 2005-03-17 | Donam Systems Inc. | Fiber bragg grating sensor system |
| CN101769442A (en) * | 2010-01-18 | 2010-07-07 | 大连理工大学 | Method for monitoring pipeline corrosion |
| CN103017804A (en) * | 2012-12-26 | 2013-04-03 | 中国科学院上海光学精密机械研究所 | High-time-synchronization multichannel fiber bragg grating sensing system |
| CN104808125A (en) * | 2015-05-04 | 2015-07-29 | 华北电力大学 | System for detecting local discharge in transformer oil on basis of fiber Bragg grating |
| CN205562415U (en) * | 2016-04-12 | 2016-09-07 | 国家电网公司 | Benzvalene form insulator crack detection appearance based on fiber grating |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060546A (en) * | 2018-08-29 | 2018-12-21 | 西安交通大学 | It is a kind of using optical-fibre needle to the strain gauge means and method of the disc insulator water pressure test |
| CN110780171A (en) * | 2019-11-13 | 2020-02-11 | 合肥工业大学 | Online state detection system of GIS basin-type insulator based on fiber bragg grating |
| CN112582114A (en) * | 2020-11-24 | 2021-03-30 | 华南理工大学 | Composite insulator and method for detecting composite insulator brittle failure based on fiber bragg grating |
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Application publication date: 20160629 |