CN102608506B - Partial discharge ultrahigh-frequency detection Peano fractal antenna - Google Patents
Partial discharge ultrahigh-frequency detection Peano fractal antenna Download PDFInfo
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- CN102608506B CN102608506B CN201210102181.XA CN201210102181A CN102608506B CN 102608506 B CN102608506 B CN 102608506B CN 201210102181 A CN201210102181 A CN 201210102181A CN 102608506 B CN102608506 B CN 102608506B
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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 fractal antenna designs field, particularly a kind of local discharge ultrahigh-frequency detection fractal antenna that have employed the fractal principle design of Peano tri-rank.
Background technology
Transformer is one of equipment of most critical in electric system, and its normal operation is the important guarantee to power system security, reliable, high-quality, economical operation, must prevent and reduce the generation of transformer fault and accident to greatest extent.But due to transformer long-time running, fault and accident always can not be avoided completely, and initiating failure and accident are again for the many-sided reason of crowd.In transformer fault, insulation fault occupies very high proportion, and partial discharge phenomenon can be produced before generation insulation fault, so, by the on-line monitoring of partial discharge of transformer, can the Hidden fault of Timeliness coverage inside transformer, avoid paroxysmal insulation fault occurs, be conducive to the safe operation of electric system.
Detecting and assessing due to shelf depreciation is the important means of transformer insulated condition monitoring.Therefore, no matter be research institution, manufacturer, or Operation of Electric Systems department, be concerned about all 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 of transformer, in oil, shelf depreciation causes the principal element of transformer insulated fault, in oil, shelf depreciation can produce the current impulse of nanosecond, and stimulating frequency can reach the electromagnetic wave of GHz.Given this feature is planted, scientific and technical personnel work out ultrahigh frequency method to carry out relevant monitoring, this method judges the method for shelf depreciation with the electromagnetic wave that shelf depreciation point produces, frequency is 200MHz ~ 3000MHz by detecting, due to it, to have antijamming capability strong, highly sensitive, become in recent years partial discharge of transformer detect in important method.
One of gordian technique of partial discharge of transformer on-line monitoring ultrahigh frequency monitoring method is ultra-high frequency antenna, and the quality of its performance directly affects extraction and the post-processed of local discharge signal.The antenna being commonly used to partial discharge of transformer on-line monitoring ultra-high-frequency detection at present mainly contains Archimedes's both arms flat helical antenna, cone antenna and dipole antenna etc., practical application experience shows: the measurement bandwidth of existing antenna is narrower, have 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 shortcoming that existing antenna detection frequency band is narrower, output impedance is lower, deflection is narrower, disclose a kind of partial discharge ultrahigh-frequency detection Peano fractal antenna, its good directionality, bandwidth, standing-wave ratio (SWR) be little, be convenient to impedance matching, can meet the requirement of partial discharge of transformer on-line monitoring ultra-high-frequency detection.
The object of this invention is to provide a kind of partial discharge ultrahigh-frequency detection Peano fractal antenna, comprise dielectric layer and conductor layer, described conductor layer is laid in the upper surface of dielectric layer, described conductor layer comprises many end to end bending wire sections, described conducting line segment is arranged according to Peano tri-rank fractal principle, forms three rank radiator antenna elements; Described conductor layer coverage rate is on the dielectric layer rectangular surfaces, and the length of side of described coverage rate is the length of side of conductor layer, and described conducting line segment is provided with feeding point;
Further, also comprise ground plane, described ground plane is laid in the lower surface of dielectric layer;
Further, described feeding point is arranged on close on the initial position of conducting line segment;
Further, the length of side span of described conductor layer is 30 ~ 200mm, and the span of the width of described conducting line segment is 0.5 ~ 10mm, and the span of the thickness of described dielectric layer is 1 ~ 4mm;
Further, described conducting line segment is Copper Foil;
Further, described conducting line segment is coated with tin layers;
Further, described dielectric layer is epoxy resin dielectric plate, and the length of side of described 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 described conductor layer is 90mm, and the width of described conducting line segment is 1mm, and the thickness of described dielectric layer is 2mm.
Fractal technology is that some special natures having benefited from mathematically fractal object grow up.No matter be the fractal of occurring in nature or mathematical fractal object, can both simple algorithm grey iterative generation be step by step passed through, finally can go into surprising labyrinth.One of fractal characteristic is exactly " fractal dimension ".This characteristic makes fractally in very little volume, to utilize space fully, is also that it can be used in a key reason of antenna miniaturization design.In the fractal curve of multiple classics, Peano curve is owing to being made up of more piece line segment, so be a kind of fractal curve that can cover more space than traditional curve, in fact, this kind of curve almost can regard a series of point as to fill up whole square surface (still keeping being bar curve) itself.Utilize this characteristic, the size of antenna can reduce greatly.
Partial discharge ultrahigh-frequency detection Peano fractal antenna of the present invention has following beneficial effect:
1. in 200MHz to 3GHz scope, have multiple measurement bandwidth, measurement bandwidth is wider, and measurement bandwidth standing internal wave ratio is less than 5, can record the most information of shelf depreciation, can not cause omission situation;
2. there is the output impedance of 50 ohm, be easy to form impedance matching with signal transmission line;
3. there is spherical directivity, to the signal from all directions, there is identical gain, be conducive to being received in oil tank of transformer and complicated catadioptric local discharge signal occurs, especially to feeble signal, there is high sensitivity.
Other advantages of the present invention, target, to set forth in the following description to a certain extent with feature, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized by instructions below and claims and be obtained.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, 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;
Fig. 3 is conducting line segment width a when being 1mm, the standing wave schematic diagram when thickness b of dielectric layer is 2mm;
Fig. 4 is conducting line segment width a is 1mm, when the thickness b of dielectric layer is 2mm, and antenna two-dimensional directional and gain schematic diagram;
Fig. 5 is laboratory local discharge superhigh frequency detection experiment platform schematic diagram;
Fig. 6 is four kinds of different discharge signals detecting of Peano fractal antenna of the present invention and frequency spectrum thereof.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
As shown in Figure 1 to Figure 2, the present invention includes dielectric layer 1, conductor layer 2 and ground plane 4, conductor layer 2 is laid in the surface of dielectric layer 1, and ground plane 4 is laid in the lower surface of dielectric layer 1; Conductor layer 2 comprises many end to end bending wire sections 22, and conducting line segment 22 is arranged according to Peano tri-rank fractal principle, 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 described feeding point 3 is arranged on close to the initial position of conducting line segment 22.In the present embodiment, conducting line segment 22 is Copper Foil, for extending the ability to accept of its serviceable life and booster signal, conducting line segment 22 is coated with tin layers; Dielectric layer 1 adopts 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.Fig. 3 is conducting line segment width a when being 1mm, the standing wave schematic diagram when thickness b of dielectric layer is 2mm.As seen in Figure 3, antenna has 2 resonant frequency points at below 1GHz, and three resonant frequency point place bandwidth are all wider, can meet the requirement of design and use.The antenna direction that emulation obtains and gain schematic diagram be (figure a is first resonant frequency point of antenna is 370MHz, and figure b is antenna second resonant frequency point is 700MHz) as shown in Figure 4.As seen from the figure, antenna has hemispheric directional diagram, and can receive the electromagnetic wave from all directions, its directivity and gain are all relatively good.
Fractal antenna measurement bandwidth of the present invention is wider, and measurement bandwidth standing internal wave ratio is less than 5, has highly sensitive characteristic, is applicable to very much the detection of local discharge superhigh frequency, can records most shelf depreciation information, even if weak output signal, and also can complete documentation.
test explanation
The test platform that use for laboratory as shown in Figure 5 detects in transformer partial discharge super high frequency, pick-up unit includes fractal antenna 5 of the present invention, amplifilter 6 and oscillograph 7, wherein, the feeding point of fractal antenna 4 is connected by the input end of coaxial radio frequency cable 8 with amplifilter 6, and the output terminal of amplifilter 6 is connected by the signal input part of coaxial radio frequency cable 9 with oscillograph 7.
Fig. 6 is four kinds of different discharge signals detecting of Peano fractal antenna of the present invention and frequency spectrum thereof.Under producing similarity between ultra-high frequency signal frequency spectrum and same trial voltage according to the same discharging model of Analysis of test results under three trial voltages, different discharging model produces the similarity between ultra-high frequency signal energy frequency spectrum.Result shows: for same discharging model, and when trial voltage changes, the similarity change between ultra-high frequency signal frequency spectrum is little; Under same experimental voltage, the ultra-high frequency signal frequency spectrum similarity that the measurement of dissimilar discharging model obtains is lower, can identify from the angle of waveform to dissimilar discharge signal.
Claims (6)
1. partial discharge ultrahigh-frequency detection Peano fractal antenna, comprise dielectric layer (1) and conductor layer (2), described conductor layer (2) is laid in the upper surface of dielectric layer (1), it is characterized in that: described conductor layer (2) comprises many end to end bending wire sections (22), described conducting line segment (22) is arranged according to Peano tri-rank fractal principle, forms three rank radiator antenna elements; The coverage rate of described conductor layer (2) on dielectric layer (1) is rectangular surfaces, and the length of side of described coverage rate is the length of side of conductor layer (2), and described conducting line segment (22) is provided with feeding point (3); Described feeding point (3) is arranged on close to the initial position of conducting line segment (22); The length of side of described conductor layer (2) is 90mm, and the width (a) of described conducting line segment (22) is 1mm, and the thickness (b) of described dielectric layer (1) is 2mm.
2. partial discharge ultrahigh-frequency detection Peano fractal antenna according to claim 1, is characterized in that: also comprise ground plane (4), and described ground plane (4) is laid in the lower surface of dielectric layer (1).
3. partial discharge ultrahigh-frequency detection Peano fractal antenna according to claim 1, it is characterized in that: the length of side span of described conductor layer (2) is 30 ~ 200mm, the span of the width (a) of described conducting line segment (22) is 0.5 ~ 10mm, and the span of the thickness (b) of described dielectric layer (1) is 1 ~ 4mm.
4. partial discharge ultrahigh-frequency detection Peano fractal antenna according to claim 1, is characterized in that: described conducting line segment (22) is Copper Foil.
5. partial discharge ultrahigh-frequency detection Peano fractal antenna according to claim 1, is characterized in that: (22) are coated with tin layers to described conducting line segment.
6. partial discharge ultrahigh-frequency detection Peano fractal antenna according to claim 1, it is characterized in that: described dielectric layer (1) is epoxy resin dielectric plate, its specific inductive capacity is 4.4, the length of side of described dielectric layer (1) is longer than the length of side of conductor layer (2), and its difference range is 1 ~ 8mm.
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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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| CN102608506B true CN102608506B (en) | 2015-06-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN104133163B (en) * | 2014-06-06 | 2017-05-03 | 重庆大学 | External multi-band ultrahigh-frequency sensor for online GIS partial discharge detection |
| FR3024240B1 (en) * | 2014-07-28 | 2018-02-16 | 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 |
| CN107121625B (en) * | 2017-06-12 | 2019-12-31 | 华北电力大学（保定） | Miniature LS Peano fractal antenna for partial discharge ultrahigh frequency detection |
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| EP1592083B1 (en) * | 2000-01-19 | 2013-04-03 | Fractus, S.A. | Space-filling miniature antennas |
| EP1425820A1 (en) * | 2001-09-13 | 2004-06-09 | Fractus, S.A. | Multilevel and space-filling ground-planes for miniature and multiband antennas |
| EP1451893A1 (en) * | 2001-12-10 | 2004-09-01 | Fractus, S.A. | Contactless identification device |
| EP1563570A1 (en) * | 2002-11-07 | 2005-08-17 | Fractus, S.A. | Integrated circuit package including miniature antenna |
| CN101557035B (en) * | 2009-05-20 | 2012-08-15 | 重庆大学 | Local discharge ultrahigh-frequency detection fractal antenna and preparation method thereof |
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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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