CN102608506A - Partial discharge ultrahigh-frequency detection Peano fractal antenna - Google Patents
Partial discharge ultrahigh-frequency detection Peano fractal antenna Download PDFInfo
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- CN102608506A CN102608506A CN201210102181XA CN201210102181A CN102608506A CN 102608506 A CN102608506 A CN 102608506A CN 201210102181X A CN201210102181X A CN 201210102181XA CN 201210102181 A CN201210102181 A CN 201210102181A CN 102608506 A CN102608506 A CN 102608506A
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Abstract
The invention discloses a partial discharge ultrahigh-frequency detection Peano fractal antenna, wherein the partial discharge detection Peano fractal antenna comprises a dielectric layer and a conductor layer, wherein the conductor layer is laid on the upper surface of the dielectric layer; the conductor layer comprises a plurality of end-to-end bend conductor sections; the conductor sections are arranged according to the Peano three-stage fractal principle so as to form a three-stage radiation antenna element; the covering surface of the conductor layer on the dielectric layer is a rectangular surface; the side length of the covering surface is the side length of the conductor layer; and the conductor sections are provided with feeding points. The Peano fractal antenna provided by the invention has good direction property, is wide in frequency band, has small standing-wave ratio, is convenient for impedance match, and can meet the requirement of transformer partial discharge on-line monitoring ultrahigh-frequency detection.
Description
Technical field
The present invention relates to the fractal antenna designs field, particularly a kind of local discharge ultrahigh-frequency detection fractal antenna that adopts Peano three rank fractal principle designs.
Background technology
Transformer is one of equipment of most critical in the electric system, and its normal operation is to the important assurance of power system security, reliable, high-quality, economical operation, must prevent and reduce the generation of transformer fault and accident to greatest extent.But because the transformer long-time running, fault and accident always can not be avoided fully, and initiating failure and accident are started from the reason of numerous aspects again.In transformer fault; Insulation fault occupies very high proportion, and before insulation fault takes place, can produce partial discharge phenomenon, so; On-line monitoring through partial discharge of transformer; Can in time find the latency fault that transformer is inner, avoid taking place paroxysmal insulation fault, help the safe operation of electric system.
Because the detection of shelf depreciation and the important means that evaluation is transformer insulated condition monitoring.Therefore, no matter be research institution, manufacturer, or Operation of Electric Systems department, all be concerned about very much the development of Partial Discharge Detecting Technology.
At present; China 110kv and above high-power transformer adopt oil-filled transformer mostly, and for this kind transformer, shelf depreciation is to cause the principal element of transformer insulated fault in the oil; Shelf depreciation can produce the current impulse of nanosecond in the oil, and stimulating frequency can reach the electromagnetic wave of GHz.Given this plant characteristics; Scientific and technical personnel work out the monitoring of being correlated with of ultrahigh frequency method; This method follows shelf depreciation point produces, frequency is 200MHz ~ 3000MHz electromagnetic wave to judge the method for shelf depreciation through detection; Because it is strong, highly sensitive that it has an antijamming capability, become the important method of partial discharge of transformer in detecting in recent years.
One of gordian technique of partial discharge of transformer on-line monitoring ultrahigh frequency monitoring method is a ultra-high frequency antenna, and the quality of its performance directly influences the extraction and the post-processed of local discharge signal.The antenna that generally is used at present the detection of partial discharge of transformer on-line monitoring ultrahigh frequency mainly contains Archimedes's both arms flat helical antenna, cone antenna and dipole antenna etc.; Practical application experience shows: the detection frequency band of existing antenna is narrower, has lost more shelf depreciation information; Output impedance is lower, is unfavorable for forming good impedance matching with signal transmission line; Deflection is narrower, is unfavorable for receiving faint local discharge signal.
Summary of the invention
In view of this; The present invention is directed to the existing shortcoming that the antenna detection frequency band is narrower, output impedance is lower, deflection is narrower; Disclose a kind of local discharge superhigh frequency and detected the Peano fractal antenna; Its good directionality, bandwidth, standing-wave ratio (SWR) be little, be convenient to impedance matching, can satisfy the requirement that partial discharge of transformer on-line monitoring ultrahigh frequency detects.
The purpose of this invention is to provide a kind of local discharge superhigh frequency and detect the Peano fractal antenna; Comprise dielectric layer and conductor layer; Said conductor layer is laid in the upper surface of dielectric layer; Said conductor layer comprises many end to end bent sections, and said conducting line segment is provided with according to Peano three rank fractal principles, forms three rank radiator antenna elements; The coverage rate of said conductor layer on dielectric layer is rectangular surfaces, and the length of side of said coverage rate is the length of side of conductor layer, and said conducting line segment is provided with feeding point;
Further, also comprise ground plane, the be laid in lower surface of dielectric layer of said ground plane;
Further, said feeding point is arranged near on the initial position of conducting line segment;
Further, the length of side span of said conductor layer is 30 ~ 200mm, and the span of the width of said conducting line segment is 0.5 ~ 10mm, and the span of said dielectric layer thickness is 1 ~ 4mm;
Further, said conducting line segment is a Copper Foil;
Further, be coated with the tin layer on the said conducting line segment;
Further, said dielectric layer is the epoxy resin dielectric plate, and the length of side of said dielectric layer is longer than the length of side of conductor layer, and its difference range is 1 ~ 8mm.
Further, the length of side of said conductor layer is 90mm, and the width of said conducting line segment is 1mm, and said dielectric layer thickness is 2mm.
Fractal technology is to have benefited from dividing on the mathematics some special natures of shaped object to grow up.No matter be the fractal or mathematical minute shaped object of occurring in nature, can both finally can go into surprising labyrinth through simple algorithm iteration generation step by step.One of fractal characteristic is exactly " fractal dimension ".This specific character makes fractally can utilize the space fully in very little volume, also be its key reason that can be used in the antenna miniaturization design.In the fractal curve of multiple classics; The Peano curve is owing to be made up of the more piece line segment; So be a kind of fractal curve that can cover more space than traditional curve; In fact, this kind curve almost can be regarded a series of point as and fills up whole square surface (itself still keep is the bar curve).Utilize this specific character, the size of antenna can reduce greatly.
Local discharge superhigh frequency of the present invention detects the Peano fractal antenna and has following beneficial effect:
1. in the 3GHz scope, have a plurality of detection frequency bands at 200MHz, detect the frequency band broad, detect the frequency band standing internal wave, can write down the most information of shelf depreciation, can not cause the omission situation than less than 5;
2. the output impedance that has 50 ohm is easy to form impedance matching with signal transmission line;
3. have spherical directivity, the signal from all directions is had identical gain, help being received in oil tank of transformer complicated catadioptric local discharge signal takes place, especially feeble signal is had high sensitivity.
Other advantages of the present invention, target; To in instructions subsequently, set forth to a certain extent with characteristic; And to a certain extent,, perhaps can from practice of the present invention, obtain instruction based on being conspicuous to those skilled in the art to investigating of hereinafter.Target of the present invention and other advantages can realize and obtain through following instructions and claims.
Description of drawings
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is made further detailed description below, wherein:
Fig. 1 is the structural representation of Peano fractal antenna of the present invention;
Fig. 2 is the side schematic view of Peano fractal antenna;
When Fig. 3 is 1mm for conducting line segment width a, the standing wave synoptic diagram when dielectric layer thickness b is 2mm;
Fig. 4 is 1mm for conducting line segment width a, when dielectric layer thickness b is 2mm, and antenna two-dimensional directional and gain synoptic diagram;
Fig. 5 detects the test platform synoptic diagram for the laboratory local discharge superhigh frequency;
Fig. 6 is detected four kinds of different discharge signals of Peano fractal antenna of the present invention and frequency spectrum thereof.
Embodiment
Below will carry out detailed description to the preferred embodiments of the present invention with reference to accompanying drawing.Should be appreciated that preferred embodiment has been merely explanation the present invention, rather than in order to limit protection scope of the present invention.
To shown in Figure 2, the present invention includes dielectric layer 1, conductor layer 2 and ground plane 4 like Fig. 1, conductor layer 2 is laid in the surface of dielectric layer 1, the be laid in lower surface of dielectric layer 1 of ground plane 4; Conductor layer 2 comprises many end to end bent sections 22, and conducting line segment 22 is provided with according to Peano three rank fractal principles, forms three rank radiator antenna elements; The coverage rate of conductor layer 2 on dielectric layer 1 is rectangular surfaces, and the length of side of coverage rate is the length of side of conductor layer 2, and conducting line segment 22 is provided with feeding point 3, and said feeding point 3 is arranged near the initial position of conducting line segment 22.In the present embodiment, conducting line segment 22 is a Copper Foil, for prolonging the ability to accept of its serviceable life and booster signal, on conducting line segment 22, is coated with the tin layer; Dielectric layer 1 adopts the epoxy resin dielectric plate, and its specific inductive capacity is 4.4, and the length of side of dielectric layer 1 is greater than the length of side of conductor layer 2, and its difference range is 5mm.
In the present embodiment, the length of side of conductor layer 2 is 90mm, and the width a of conducting line segment 22 is 1mm, and the thickness b of dielectric layer 1 is 2mm.When Fig. 3 is 1mm for conducting line segment width a, the standing wave synoptic diagram when dielectric layer thickness b is 2mm.Can find out that through Fig. 3 antenna has 2 resonant frequency points below 1GHz, and three resonant frequency point place bandwidth can satisfy the requirement of design and use all than broad.The antenna direction that emulation obtains and gain synoptic diagram (figure a is that first resonant frequency point of antenna is 370MHz, and figure b is that second resonant frequency point of antenna is 700MHz) as shown in Figure 4.By visible among the figure, antenna has hemispheric directional diagram, can receive the electromagnetic wave from all directions, and its directivity is all relatively good with gain.
Fractal antenna of the present invention detects the frequency band broad, detects the frequency band standing internal wave than less than 5, has highly sensitive characteristic, is fit to very much the detection of local discharge superhigh frequency, can write down most shelf depreciation information, though weak output signal, also can complete documentation.
Test for example
Laboratory as shown in Figure 5 is used for the test platform that transformer partial discharge super high frequency detects; Pick-up unit has comprised fractal antenna of the present invention 5, amplifilter 6 and oscillograph 7; Wherein, The feeding point of fractal antenna 4 links through the input end of coaxial radio frequency cable 8 with amplifilter 6, and the output terminal of amplifilter 6 links through the signal input part of coaxial radio frequency cable 9 with oscillograph 7.
Fig. 6 is detected four kinds of different discharge signals of Peano fractal antenna of the present invention and frequency spectrum thereof.Analyze same discharging model different discharging models under similarity between the generation ultra-high frequency signal frequency spectrum and same trial voltage under three trial voltages according to testing result and produce the similarity between the ultra-high frequency signal energy frequency spectrums.The result shows: for same discharging model, when trial voltage changed, the similarity between the ultra-high frequency signal frequency spectrum changed little; Under same experimental voltage, the ultra-high frequency signal frequency spectrum similarity that measures of dissimilar discharging models is lower, can discern dissimilar discharge signals from the angle of waveform.
Claims (8)
1. local discharge superhigh frequency detects the Peano fractal antenna; Comprise dielectric layer (1) and conductor layer (2); Said conductor layer (2) is laid in the upper surface of dielectric layer (1); It is characterized in that: said conductor layer (2) comprises many end to end bent sections (22), and said conducting line segment (22) is provided with according to Peano three rank fractal principles, forms three rank radiator antenna elements; The coverage rate of said conductor layer (2) on dielectric layer (1) is rectangular surfaces, and the length of side of said coverage rate is the length of side of conductor layer (2), and said conducting line segment (22) is provided with feeding point (3).
2. local discharge superhigh frequency according to claim 1 detects the Peano fractal antenna, it is characterized in that: also comprise ground plane (4), the be laid in lower surface of dielectric layer (1) of said ground plane (4).
3. local discharge superhigh frequency according to claim 2 detects the Peano fractal antenna, and it is characterized in that: said feeding point (3) is arranged near the initial position of conducting line segment (22).
4. local discharge superhigh frequency according to claim 3 detects the Peano fractal antenna; It is characterized in that: the length of side span of said conductor layer (2) is 30 ~ 200mm; The span of the width (a) of said conducting line segment (22) is 0.5 ~ 10mm, and the span of the thickness (b) of said dielectric layer (1) is 1 ~ 4mm.
5. local discharge superhigh frequency according to claim 4 detects the Peano fractal antenna, and it is characterized in that: said conducting line segment (22) is a Copper Foil.
6. local discharge superhigh frequency according to claim 5 detects the Peano fractal antenna, and it is characterized in that: said conducting line segment is coated with the tin layer on (22).
7. local discharge superhigh frequency according to claim 6 detects the Peano fractal antenna; It is characterized in that: said dielectric layer (1) is the epoxy resin dielectric plate; Its specific inductive capacity is 4.4; The length of side of said dielectric layer (1) is longer than the length of side of conductor layer (2), and its difference range is 1 ~ 8mm.
8. local discharge superhigh frequency according to claim 7 detects the Peano fractal antenna; It is characterized in that: the length of side of said conductor layer (2) is 90mm; The width (a) of said conducting line segment (22) is 1mm, and the thickness (b) of said dielectric layer (1) is 2mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210102181.XA CN102608506B (en) | 2012-04-10 | 2012-04-10 | Partial discharge ultrahigh-frequency detection Peano fractal antenna |
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| CN201210102181.XA CN102608506B (en) | 2012-04-10 | 2012-04-10 | Partial discharge ultrahigh-frequency detection Peano fractal antenna |
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| CN102608506A true CN102608506A (en) | 2012-07-25 |
| CN102608506B CN102608506B (en) | 2015-06-10 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916247A (en) * | 2012-10-12 | 2013-02-06 | 重庆大学 | Hilbert fractal antenna array for ultra-high-frequency detection of partial discharge |
| CN103903048A (en) * | 2014-03-28 | 2014-07-02 | 西安交通大学 | Folding Peano fractal anti-metallic ultrahigh frequency RFID electronic tag |
| CN104133163A (en) * | 2014-06-06 | 2014-11-05 | 重庆大学 | External multi-band ultrahigh-frequency sensor for online GIS partial discharge detection |
| FR3024240A1 (en) * | 2014-07-28 | 2016-01-29 | Alstom Technology Ltd | PARTIAL DISCHARGE DETECTION DEVICE WITH FRACTALLY ARCHITECTURED ANTENNA |
| CN105305062A (en) * | 2015-12-15 | 2016-02-03 | 华北电力大学（保定） | Wunderlich fractal antenna for electric appliance partial discharge ultrahigh-frequency detection and design method |
| CN107121625A (en) * | 2017-06-12 | 2017-09-01 | 华北电力大学（保定） | Partial-discharge ultrahigh-frequency is detected with miniature LSPeano fractal antennas |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916247A (en) * | 2012-10-12 | 2013-02-06 | 重庆大学 | Hilbert fractal antenna array for ultra-high-frequency detection of partial discharge |
| CN102916247B (en) * | 2012-10-12 | 2015-11-18 | 重庆大学 | Hilbert fractal antenna array for ultra-high-frequencydetection detection of partial discharge |
| CN103903048A (en) * | 2014-03-28 | 2014-07-02 | 西安交通大学 | Folding Peano fractal anti-metallic ultrahigh frequency RFID electronic tag |
| CN104133163A (en) * | 2014-06-06 | 2014-11-05 | 重庆大学 | External multi-band ultrahigh-frequency sensor for online GIS partial discharge detection |
| FR3024240A1 (en) * | 2014-07-28 | 2016-01-29 | Alstom Technology Ltd | PARTIAL DISCHARGE DETECTION DEVICE WITH FRACTALLY ARCHITECTURED ANTENNA |
| WO2016016198A1 (en) * | 2014-07-28 | 2016-02-04 | Alstom Technology Ltd | Device for detecting a partial discharge from high-voltage gas-insulated equipment |
| CN105305062A (en) * | 2015-12-15 | 2016-02-03 | 华北电力大学（保定） | Wunderlich fractal antenna for electric appliance partial discharge ultrahigh-frequency detection and design method |
| CN107121625A (en) * | 2017-06-12 | 2017-09-01 | 华北电力大学（保定） | Partial-discharge ultrahigh-frequency is detected with miniature LSPeano fractal antennas |
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Inventor after: Li Jian Inventor after: Wang Zhengjiang Inventor after: Zhang Jin Inventor after: Mi Sibei Inventor after: Yuan Wen Inventor after: Tian Miao Inventor after: Du Lin Inventor after: Liu Fan Inventor after: Liao Ruijin Inventor after: Zhang Yun Inventor after: Wang Youyuan Inventor after: Zhou Quan Inventor after: Wei Yuan Inventor after: Xiang Chenmeng Inventor before: Li Jian Inventor before: Du Lin Inventor before: Liu Fan Inventor before: Liao Ruijin Inventor before: Zhang Yun Inventor before: Wang Youyuan |
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Free format text: CORRECT: INVENTOR; FROM: LI JIAN DU LIN LIU FAN LIAO RUIJIN ZHANG YUN WANG YOUYUAN TO: LI JIAN DU LIN LIU FAN LIAO RUIJIN ZHANG YUN WANG YOUYUAN ZHOU QUAN WEI YUAN XIANG CHENMENG WANG ZHENGJIANG ZHANG JIN MI SIBEI YUAN WEN TIAN MIAO |
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