CN104062568A - System for detecting partial discharge direction of compound eye type optical fiber EFPI - Google Patents
System for detecting partial discharge direction of compound eye type optical fiber EFPI Download PDFInfo
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 20
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
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- 238000013461 design Methods 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000010408 film Substances 0.000 description 8
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- 239000003921 oil Substances 0.000 description 5
- 238000002310 reflectometry Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 239000012943 hotmelt Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
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- G—PHYSICS
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- 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
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Abstract
本发明涉及一种复眼式光纤EFPI局部放电方向检测系统，属于电力油纸绝缘电气设备局部放电在线监测技术领域。该系统窄带光源(1)、光滤波器(2)、光分路器(3)依次相连；分为五条光路的每条光路光环形器、单模光纤、光纤外腔式珐珀传感头依次相连；光环形器还与光电探测器(7)、放大器(8)相连；放大器(8)与示波器(9)相连。供电，使各器件处于工作状态；将复眼式光纤外腔式珐珀传感器放置在绝缘杆的顶端，转动绝缘杆等直到位于中间的光纤外腔式珐珀传感头的局放脉冲幅值最大，而另四个大致相等；即为局部放电点的方向。本发明灵敏度高，方向性好，抗干扰能力强；能方便准确地进行电力设备的重点部位局部放电方向定位。
The invention relates to a compound-eye optical fiber EFPI partial discharge direction detection system, which belongs to the technical field of partial discharge on-line monitoring of electric oil-paper insulated electrical equipment. The narrow-band light source (1), optical filter (2), and optical splitter (3) of the system are connected in sequence; each of the five optical paths is divided into an optical circulator, a single-mode optical fiber, and an optical fiber external cavity FAP sensor head are connected in sequence; the optical circulator is also connected with the photodetector (7) and the amplifier (8); the amplifier (8) is connected with the oscilloscope (9). Power supply to keep each device in working condition; place the compound-eye fiber optic external cavity FAP sensor on the top of the insulating rod, turn the insulating rod, etc. until the partial discharge pulse amplitude of the optical fiber external cavity FAP sensor head in the middle is the largest , while the other four are approximately equal; that is, the direction of the partial discharge point. The invention has high sensitivity, good directivity and strong anti-interference ability; it can conveniently and accurately locate the partial discharge direction of key parts of electric equipment.
Description
Technical field
The present invention relates to a kind of compound eye type optical fiber EFPI shelf depreciation direction detection system, belong to electric power paper oil insulation local discharge of electrical equipment on-line monitoring technique field.
Background technology
Paper oil insulation electrical equipment (taking transformer as main) partial discharge monitoring has several different methods both at home and abroad at present, mainly comprise very high frequency(VHF) (VHF) pulse current detection method, ultrahigh frequency (UHF) Electromagnetic Wave Detection method and piezoelectric sensor ultrasonic Detection Method, what wherein VHF and UHF detection method detected is electric signal, is easily subject to the interference of electromagnetic interference signal; What piezoelectric supersonic method detected is ultrasonic signal, and sensor is to be attached to the ultrasonic signal that on device housings, the inner shelf depreciation of checkout equipment produces, though be not vulnerable to the interference of electromagnetic noise, sensitivity is not high.Also there is the inside that piezoelectric sensor is placed on to device housings, in oil, detect shelf depreciation, but because piezoelectric supersonic sensor detection sensitivity in oil is not high, can not be placed on current potential higher position and measure, its detection method is restricted simultaneously.
The technology of optical method for measuring local discharge of electrical equipment has three kinds---direct detection visible ray method, Faraday magnetooptical effect method and light-supercritical ultrasonics technology.Direct detection visible ray method be only suitable in transparent dielectric as the high-voltage electrical equipment of insulating material, be not suitable for the Partial Discharge Detection using solid dielectric, liquid dielectric as the high-voltage electrical equipment of insulating material; Light current sensor based on Faraday magnetooptical effect principle is only suitable for the Partial Discharge Detection of the high-voltage electrical equipment of solid shape, and can not get rid of from the high-intensity magnetic field of site space and disturb and cannot distinguish the electromagnetic pulse signal of crosstalking from high-voltage electrical equipment ground wire; Light-supercritical ultrasonics technology sensor has that volume is little, loss is low, it is little to disturb, the advantage of good insulation preformance and anti-explosion, anti-corrosion and being with a wide range of applications.
Light-supercritical ultrasonics technology comprises that fiber grating is surveyed ultrasonic vibration method and light interferes survey ultrasonic vibration method fiber optic interferometric method survey ultrasonic vibration to have three kinds of methods: optical fiber Michelson (Michelson) interferometric method, optical fiber mach-Ze Deer interfere (Mach-Zehnder) method and Fabry-Paro (Fabry-Perot) interferometric method.The sensitivity of Michelson method detection system is not high, and has the multipath problem of ultrasonic propagation; Not high enough, the complex structure of optical fiber mach-Ze Deer interferometric method frequency, demodulation frequency response is high to equipment requirement; Optical fiber Fabry-Paro rule has simple in structure, and volume is little, high reliability, and high sensitivity, Fast Time Response, antijamming capability is strong etc., and advantage receives the general concern of people.
Optical fiber EFPI (the extrinsic Fabry-Perotinterferometer of current domestic research, external cavity type Fabry-Paro interferometric sensor) be mainly used in the measurement of the gradual amounts such as temperature, strain, pressure, be still not suitable for high frequency Partial Discharge Detection fast.
Fiber external cavity formula enamel amber sensing head, generally, formed by optical fiber 01, insulating support 02, silicon sleeve pipe 03 and silicon thin film sheet 04, between silicon thin film sheet 04 and silicon sleeve pipe 03, realize fixing seal by the method for carbon dioxide laser hot melt, between insulating support 02 and silicon sleeve pipe 03, realize fixing seal by the method for carbon dioxide laser hot melt, and insulating support 02 is realized fixing seal by the method for carbon dioxide laser hot melt, the center-aligned of (will ensure in the manufacturing process of sensing head) silicon thin film Pian04 center and optical fiber with optical fiber 01.
Summary of the invention
Object of the present invention is mainly used in the measurement of the gradual amounts such as temperature, strain, pressure for the optical fiber EFPI type sensor of domestic research, still be not suitable for the high frequency deficiency of Partial Discharge Detection fast, proposed a kind of compound eye type optical fiber EFPI shelf depreciation direction detection system.
A kind of compound eye type optical fiber EFPI shelf depreciation direction detection system, this system is made up of narrow-band light source, optical filter, optical branching device, five identical optical circulators, five single-mode fibers, five identical photodetectors, five identical amplifiers, compound eye type fiber external cavity formula F-P sensor and oscillographs;
Described narrow-band light source is connected with optical branching device successively with optical filter;
Described compound eye type fiber external cavity formula F-P sensor is made up of five identical fiber external cavity formula enamel amber sensing heads;
The light after optical filter filters is divided into five light paths by described optical branching device, and one of optical circulator that every light path is identical with five one of one of optical circulator, five single-mode fibers single-mode fiber, five identical fiber external cavity formula enamel amber sensing heads fiber external cavity formula enamel amber sensing head is connected successively;
One of described five identical optical circulators optical circulator also again one of photodetector identical with five one of photodetector, five identical amplifiers amplifier be connected successively separately one by one;
Five identical amplifiers are all connected with oscillograph.
Described compound eye type fiber external cavity formula F-P sensor is made up of five identical fiber external cavity formula enamel amber sensing heads, in the middle of among five identical fiber external cavity formula enamel amber sensing heads, a fiber external cavity formula enamel amber sensing head is positioned at, all the other four fiber external cavity formula enamel amber sensing heads are evenly placed surrounding, and are all miter angle with intermediate fibres external cavity type enamel amber sensing head.
The present invention can measure high-frequency signal delicately, for partial discharge monitoring.
Beneficial effect of the present invention:
1, the present invention have highly sensitive, good directionality, the feature that antijamming capability is strong, can suppress the impact that ultrasonic vibration multipath propagation brings.And sensor probe is little, can be used as a kind of point sensor, the keypoint part that is easily arranged on power equipment carries out the detection of shelf depreciation.
2, the present invention can measure high-frequency signal delicately, for partial discharge monitoring.
3, the present invention has proposed first compound eye type sensor and has determined shelf depreciation point direction method, has designed accordingly five probe sensors, can easily and accurately carry out shelf depreciation direction location.
Brief description of the drawings
Fig. 1 is compound eye type optical fiber EFPI shelf depreciation direction detection system structural representation.
Fig. 2 is compound eye type fiber external cavity formula F-P sensor (solid) structural representation.
Fig. 3 is the structural representation of existing single fiber external cavity formula enamel amber sensing head.
Fig. 4 is light intensity and the long schematic diagram that is related to of film reflectivity and chamber.
Fig. 5 is that in the maximum interval of light intensity peak peak value, what light intensity and chamber were long is related to schematic diagram.
Fig. 6 is the Partial discharge signal schematic diagram that PD meter, optical fiber EFPI sensor and piezoceramic transducer detect.
When Fig. 7 is unloaded pressurization, the detection signal schematic diagram of PD meter, optical fiber EFPI sensor, piezoelectric ceramics.
Fig. 8 is the piezoceramic transducer dough softening, compound eye type fiber external cavity formula F-P sensor dough softening schematic diagram.Wherein, figure (a) is piezoceramic transducer dough softening schematic diagram; Figure (b) is compound eye type fiber external cavity formula F-P sensor dough softening schematic diagram.
Fig. 9 is that head angle arranges schematic diagram.
Figure 10 is 10～90 ° of angular response curve maps of optical fiber EFPI sensor.
Wherein, 1-narrow-band light source, 2-optical filter, 3-optical branching device, 4-optical circulator, 5 single-mode fibers,
6-fiber external cavity formula enamel amber sensing head, 7-photodetector, 8-amplifier, 9-oscillograph, 10-compound eye type fiber external cavity formula F-P sensor, 01-optical fiber, 02-insulating support, 03-silicon sleeve pipe, 04-silicon thin film sheet.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
Fig. 1 is compound eye type optical fiber EFPI shelf depreciation direction detection system structural representation.As shown in Figure 1, the monochromatic source that fixes on 1310nm taking wavelength is example explanation, a kind of compound eye type optical fiber EFPI shelf depreciation direction detection system, and this system architecture is:
1) wavelength fixes on the monochromatic source of 1310nm, is filtered and is obtained monochromatic wavelength light source by optical fiber filter by narrow-band light source 1.Narrow-band light source 1 is selected SLED type light source, and wave filter is selected 1310nm fiber band-pass filter.
2) fiber selection 1310nm single-mode fiber, its center glass core diameter 9um, covering overall diameter 125um.Find that after tested, at 1310nm wavelength place, the total dispersion of single-mode fiber is zero.From the loss characteristic of optical fiber, 1310nm place is also a low loss window of optical fiber.So select light source of the present invention to be chosen in 1310nm place.
3) photodetector 7 is selected PIN photodiode, has the good linearity of incident light quantity and output current; Fast response time; Output error is little; The caused output variation of variation of ambient temperature is little; Make simple; The feature that reliability is high.
4) optical fiber circulator is the incident light non-reciprocal device that reflected light is exported from another port from determining port output that only allows certain port.Propagate along specified path for guarantee optical fiber, need to use optical circulator 4.
5) due to present stage manufacturing technology reason, the hardware devices such as narrow-band light source 1, optical filter 2 can not ensure that in process parameter is in full accord, and signal input also has dispersiveness, therefore, for reducing as far as possible the dispersiveness of test result, need to select optical branching device 3.
6) amplifier 8 of the photoelectricity of the present invention's design adopts three grades of amplifications, and wherein every grade of amplifying circuit is consistent, and is together in series.Single-stage amplifying circuit as shown in Figure 1.Prime amplifier is selected OPA637.
7) design of fiber external cavity formula enamel amber sensing head
The design of fiber external cavity formula enamel amber sensing head is the core of compound eye type fiber external cavity formula F-P sensor system.As shown in Figure 2, Fig. 2 is compound eye type fiber external cavity formula F-P sensor (solid) structural representation to the structure of fiber external cavity formula enamel amber sensing head.In Fig. 2, can see silicon thin film sheet and silicon sleeve pipe non-perpendicular, but have certain angle.Fig. 3 is the structural representation of existing single fiber external cavity formula enamel amber sensing head, generally, a fiber external cavity formula enamel amber sensing head is made up of optical fiber 01, insulating support 02, silicon sleeve pipe 03 and silicon thin film sheet 04, realize silicon thin film sheet 04 and silicon sleeve pipe 03 by the method for carbon dioxide laser hot melt, silicon sleeve pipe 03 and insulating support 02, and fixing seal between insulating support 02 and optical fiber 01, in the manufacturing process of sensing head, to ensure the center-aligned of silicon thin film Pian04 center and optical fiber 01.
Model, through emulation, is shown to angle is larger, and the response frequency of film is lower.The present invention adopts the structure that silicon thin film sheet 04 is vertical with silicon sleeve pipe 03.
A) design of silicon thin film sheet
Silicon thin film sheet adopts quartz film.The design of silicon thin film sheet comprises the sensitivity of film and determining of frequency response.The expression formula of the pressure sensitivity at diaphragm center is:
The expression formula of minimum natural frequency is:
Found by formula, the pressure sensitivity of diaphragm is directly proportional to the biquadratic of its radius, is inversely proportional to the cube of thickness; And its natural frequency is directly proportional to the thickness of diaphragm, with square being inversely proportional to of effective radius.Sensitivity and frequency response are contradictories, therefore in the time of design, take the way of compromise, make diaphragm reach best sensitivity and Hz-KHz.Selected radius R=0.9mm, thickness h=30, their highest frequency response and sensitivity are f=101.5kHz, η=0.4155.
B) cavity design of fiber external cavity formula enamel amber sensing head
In the time that change of cavity length amplitude is larger, the light intensity of sensor output will be along with chamber long period variation.For the fiber external cavity formula enamel amber sensing head of range of linearity work, it is I that its initialization point requires to work as incident intensity at Q point
0(λ), fiber end face reflectivity is R
1=0.04, film internal surface reflection rate is R
2, when the chamber length of fiber external cavity formula enamel amber sensing head is l, can show that according to the theory of optics EFPI interferometer the output optical signal intensity of fiber external cavity formula enamel amber sensing head is:
In formula,
it is the catoptrical optical path difference of two bundles.Intensity of reflected light and the contrast formula that can be derived sign sensor signal quality by formula (3) are:
Loss correction factor η is:
By light source center wavelength 1310nm, n
0=1.455 and ω=3.8 μ m for people's formula (5).Interference light intensity is carried out to simulation result as shown in Figure 4, and Fig. 4 is light intensity and the long schematic diagram that is related to of film reflectivity and chamber.The reflectivity of film is 0.35～0.36 when interval, the peak-to-peak value maximum that light intensity changes, and it is very favorable choosing quiescent point for us like this.
The long relation in light intensity to film reflectivity between 0.348～0.362 time and chamber is carried out emulation, obtains result as shown in Figure 5.Fig. 5 is that in the maximum interval of light intensity peak peak value, what light intensity and chamber were long is related to schematic diagram.According to analysis, determine that when chamber length is 50.58 μ m, light intensity mediates, namely suitable quiescent point Q.
8) compound eye type fiber external cavity formula F-P sensor design
The present invention proposes to adopt the many probe sensors of compound eye type to carry out shelf depreciation point direction location first.Main thought be by multiple sensing heads by difference towards being grouped together, the voltage signal maximum measuring towards the sensing head that approaches most shelf depreciation direction, carrys out to determine the direction of shelf depreciation point accordingly.Compound eye type fiber external cavity formula F-P sensor of the present invention is made up of five identical fiber external cavity formula enamel amber sensing heads.The fiber external cavity formula enamel amber sensing head of five all, by identical parameters design, has identical performance.In the middle of a fiber external cavity formula enamel amber sensing head is positioned at, all the other four fiber external cavity formula enamel amber sensing heads are evenly placed surrounding, are all miter angle with middle sensing head.As shown in Figure 2.(Fig. 2 is compound eye type fiber external cavity formula F-P sensor (solid) structural representation.)
Measuring when shelf depreciation, five fiber external cavity formula enamel amber sensing heads all have signal, but that fiber external cavity formula enamel amber sensing head signal is a little put in the most approaching office of direction is the strongest; Gradually sensor is turned to shelf depreciation point place, until the fiber external cavity formula enamel amber sensing head signal in the middle of being positioned at is the strongest, the fiber external cavity formula enamel amber sensing head signal that is placed in surrounding is basic identical, the fiber external cavity formula enamel amber sensing head in the middle of being now positioned at towards being shelf depreciation point direction.
Above these parts of the present invention, the annexation of a kind of compound eye type optical fiber of the present invention EFPI shelf depreciation direction detection system parts is:
1) building block is prepared: the present invention needs one of SLED type narrow-band light source, one of 1310nm fiber band-pass filter, 1 × 5 one of optical branching device, one of insulating bar of 5 Five-channel oscillographs of 5 amplifiers of the some photodetectors of the some BNC signal transmssion lines of 5 single-mode fibers of optical circulator;
2) manufacture 5 of fiber external cavity formula enamel amber sensing heads by the designing requirement of compound eye type fiber external cavity formula F-P sensor and parameter.
3) assemble by Fig. 1, each device is coupled together with single-mode fiber.Manufacture the support of five pin, fix respectively 5 fiber external cavity formula enamel amber sensing heads, fiber external cavity formula enamel amber sensing head is arranged as Fig. 6, four fiber external cavity formula enamel amber sensing heads of surrounding all become miter angle with intermediate fibres external cavity type enamel amber sensing head, composition compound eye type fiber external cavity formula F-P sensor.Fiber external cavity formula enamel amber sensing head is numbered to 1-5, and the fiber external cavity formula enamel amber sensing head mediating is numbered 1, all the other four fiber external cavity formula enamel amber sensing head number consecutively 2-5 in the direction of the clock.Regulation No. 1 sensing head the compound eye type fiber external cavity formula that is oriented F-P sensor towards;
Narrow-band light source (1) is connected with optical branching device (3) successively with optical filter (2); Described compound eye type fiber external cavity formula F-P sensor (10) is made up of five identical fiber external cavity formula enamel amber sensing heads (6); The light after optical filter (2) filters is divided into five light paths by described optical branching device (3), and one of optical circulator (4) that every light path is identical with five one of one of optical circulator, five single-mode fibers (5) single-mode fiber, five identical fiber external cavity formula enamel amber sensing heads (6) fiber external cavity formula enamel amber sensing head is connected successively; One of described five identical optical circulators (4) optical circulator also again one of photodetector (7) identical with five one of photodetector (7), five identical amplifiers (8) amplifier (8) be connected successively separately one by one; Five identical amplifiers (8) are all connected with oscillograph (9).
[performance verification experiment]:
The performance of sensing head of the present invention can be tested by the EFPI of single-path optical fiber shown in Fig. 1 pick-up unit.Paper oil insulation defect shelf depreciation model is set in laboratory, measure respectively local discharge signal by pulse current method PD meter detection system, piezoceramic transducer system and single-path optical fiber EFPI detection system simultaneously, Fig. 6 is the Partial discharge signal schematic diagram that PD meter, optical fiber EFPI sensor and piezoceramic transducer detect, result as shown in Figure 7, when Fig. 7 is unloaded pressurization, the detection signal schematic diagram of PD meter, optical fiber EFPI sensor, piezoelectric ceramics.The sensing head of visible the present invention's design can detect local discharge signal well.
By the high-field electrode of shelf depreciation model---pin electrode takes off, other conditions are constant, and unloaded pressurization, is forced into 17kV, and the signal detecting as shown in Figure 7.Pass through Fig. 7, can obtain, be pressurized to after 17kV in zero load, in environment, exist electromagnetic interference (EMI) or testing transformer to produce transaudient electromagnetic interference signal, PD meter detects discharge signal, and fiber ultrasonic wave sensor is corresponding with it without ultrasonic signal with piezoceramic transducer, this has also illustrated that ultrasonic sensor has good anti-electromagnetic interference capability, and optical fiber EFPI sensor is compared piezoceramic transducer and had better antijamming capability.
Optical fiber EFPI sensor ultrasound wave response amplitude under the ultrasound wave response amplitude of the optical fiber EFPI sensor under the different distance obtaining and 15cm is asked to ratio, then adding up the lower 50 groups of data of each distance averages, the signal that same method detects piezoceramic transducer is processed, and can obtain dough softening curve as shown in Figure 8.Fig. 8 is the piezoceramic transducer dough softening, compound eye type fiber external cavity formula F-P sensor dough softening schematic diagram.Wherein, figure (a) is piezoceramic transducer dough softening schematic diagram; Figure (b) is compound eye type fiber external cavity formula F-P sensor dough softening schematic diagram.Can see that the decay of the relative optical fiber EFPI of piezoelectric ceramics dough softening sensor is very fast, substantially, can't detect local discharge signal at 30cm place, and the distance that optical fiber EFPI sensor is put source 75cm in distance office still can detect larger discharge signal, this proves that optical fiber EFPI transducer sensitivity is higher, faint local discharge signal can be detected.
Optical fiber EFPI sensing head detection angles performance test a: sensing head is just being played a game and put a little, and the sensing head of second identical parameters becomes angle α to place with it, and as shown in Figure 9, Fig. 9 is that head angle arranges schematic diagram to model.The response curve that the shelf depreciation amplitude that obtains fiber external cavity formula enamel amber sensing head changes with angle as shown in figure 10.Figure 10 is 10～90 ° of angular response curve maps of optical fiber EFPI sensor.Visible optical fiber external cavity type enamel amber sensing head is larger towards departing from shelf depreciation orientation angle, and the signal amplitude measuring is less, but how tube angulation is not placed, and can find range from the interior signal that can measure all the time.
The present invention proposes first compound eye type sensor and determines shelf depreciation point direction, and has designed five probe sensors, can easily and accurately carry out shelf depreciation direction location.The present invention has highly sensitive, good directionality, and the feature that antijamming capability is strong, can suppress the impact that ultrasonic vibration multipath propagation brings.And sensor probe is little, can be used as a kind of point sensor, the keypoint part that is easily arranged on power equipment carries out the detection of shelf depreciation.The present invention can measure high-frequency signal delicately, for partial discharge monitoring.
The present invention is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; no matter but do any variation in its shape or structure; every have identical with a application or akin technical scheme, within all dropping on protection scope of the present invention.
Claims (8)
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| CN201410323545.6A CN104062568B (en) | 2014-07-08 | 2014-07-08 | A kind of compound eye type optical fiber EFPI shelf depreciation angle detecting system |
| PCT/CN2015/082274 WO2016004821A1 (en) | 2014-07-08 | 2015-06-25 | System for detecting partial discharge direction of compound-eye-type optical fiber efpi |
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| CN201410323545.6A CN104062568B (en) | 2014-07-08 | 2014-07-08 | A kind of compound eye type optical fiber EFPI shelf depreciation angle detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820174A (en) * | 2015-04-27 | 2015-08-05 | 国家电网公司 | Optical fiber external cavity type Fabry-Perot sensor array-based transformer partial discharge detection system |
| WO2016004821A1 (en) * | 2014-07-08 | 2016-01-14 | 江苏省电力公司扬州供电公司 | System for detecting partial discharge direction of compound-eye-type optical fiber efpi |
| CN111693076A (en) * | 2020-06-22 | 2020-09-22 | 中山水木光华电子信息科技有限公司 | Same wavelength code identification system, method, device and storage medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567818B (en) * | 2021-08-16 | 2024-05-03 | 重庆大学 | Fabry-Perot partial discharge sensing device and method based on cantilever supporting structure |
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| CN104062569B (en) * | 2014-07-08 | 2017-04-05 | 国家电网公司 | A kind of shelf depreciation direction detection method of compound eye type optical fiber EFPI |
| CN104062568B (en) * | 2014-07-08 | 2017-03-01 | 国家电网公司 | A kind of compound eye type optical fiber EFPI shelf depreciation angle detecting system |
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| WO2016004821A1 (en) * | 2014-07-08 | 2016-01-14 | 江苏省电力公司扬州供电公司 | System for detecting partial discharge direction of compound-eye-type optical fiber efpi |
| CN104820174A (en) * | 2015-04-27 | 2015-08-05 | 国家电网公司 | Optical fiber external cavity type Fabry-Perot sensor array-based transformer partial discharge detection system |
| CN111693076A (en) * | 2020-06-22 | 2020-09-22 | 中山水木光华电子信息科技有限公司 | Same wavelength code identification system, method, device and storage medium |
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| WO2016004821A1 (en) | 2016-01-14 |
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