CN203149078U - Ultrahigh frequency sensor for on-line monitoring of cable partial discharge - Google Patents
Ultrahigh frequency sensor for on-line monitoring of cable partial discharge Download PDFInfo
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- CN203149078U CN203149078U CN2013201878245U CN201320187824U CN203149078U CN 203149078 U CN203149078 U CN 203149078U CN 2013201878245 U CN2013201878245 U CN 2013201878245U CN 201320187824 U CN201320187824 U CN 201320187824U CN 203149078 U CN203149078 U CN 203149078U
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Abstract
Belonging to the technical field of cable terminal discharge monitoring, the utility model relates to an ultrahigh frequency sensor for on-line monitoring of cable partial discharge so as to solve the problems that existing ultra wideband frequency-independent antenna does not have small transmission loss and cannot ensure characteristics of a low frequency end. The ultrahigh frequency sensor includes an antenna substrate, equiangular spiral antenna segments, Archimedes antenna segments, a microstrip line substrate, a central conduction band microstrip line and an earth plate microstrip line. The equiangular spiral antenna segments and the Archimedes antenna segments are spirally arranged on the antenna substrate from the center to the outer ring direction in order, and two tail ends of the equiangular spiral antenna segments are in one-to-one corresponding connection with two head ends of the Archimedes antenna segments. The center of the head end side of the microstrip line substrate is equipped with a protruding rectangular connecting column. The central conduction band microstrip line covers the front center of the microstrip line substrate from the head end to the tail end, and the earth plate microstrip line covers the reverse center of the microstrip line substrate from the head end to the tail end. The utility model is used for on-line monitoring of ultra high frequency signals of cable partial discharge.
Description
Technical field
The utility model relates to the uhf sensor for the cable local discharge on-line monitoring, belongs to cable termination discharge monitoring technical field.
Background technology
Shelf depreciation is to cause one of power cable insulation cause faults.Because complicacy and the imperfection of cable terminal insulation, the incidence of shelf depreciation is far above cable body.Cable termination is carried out partial discharge monitoring, for ensureing that the cable line safe and reliable operation has very important meaning.
Compole is short during cable termination partial discharge pulse, be generally nanosecond, this discharge pulse can excite the electromagnetic signal of high frequency, a large amount of studies show that, the electromagnetic signal frequency band that shelf depreciation excites concentrates on 300MHz-3GHz, and the electromagnetic signal that wants to receive wideband like this need adopt the ultra broadband frequency-independent antenna.The antenna form that satisfies this requirement at present mainly contains equiangular spiral antenna and Archimedian spiral antenna.
The spiral rate of growth of equiangular spiral antenna is very fast, has the advantage that antenna arm is short, the transmission path of low frequency signal on antenna is short, loss is little, but the reflected current that also causes because of " truncation " effect simultaneously is bigger, has destroyed antenna low frequency end characteristic.
The spiral rate of growth of Archimedian spiral antenna is linear, exponential increase than equiangular spiral antenna is slow, so the antenna arm live part of terminal is more, the low frequency end characteristic is better than equiangular spiral antenna, yet because its spiral increasess slowly, spiral arm is thin, the spiral brachium, shortcomings such as loss is big, efficient is low have also been brought.
The utility model content
The utility model purpose is that can not to have loss concurrently little and guarantee the problem of low frequency end characteristic to provide a kind of uhf sensor for the cable local discharge on-line monitoring in order to solve existing ultra broadband frequency-independent antenna.
Uhf sensor for the cable local discharge on-line monitoring described in the utility model, it comprises antenna substrate, equiangular spiral antenna section, Archimedes's antenna segment, micro-strip line substrate, center conduction band microstrip line and ground plate microstrip line,
On the antenna substrate by the center to outer shroud direction spiral successively arrange equiangular spiral antenna section and Archimedes's antenna segment, two ends of equiangular spiral antenna section and two head ends of Archimedes's antenna segment connect one to one;
The center of micro-strip line substrate first end-side has outstanding rectangle joint pin, and the front center of this micro-strip line substrate is coated with center conduction band microstrip line by head end to end, and the reverse side center of this micro-strip line substrate is coated with the ground plate microstrip line by head end to end,
The rectangle joint pin of micro-strip line substrate passes the center of antenna substrate, the head end of center conduction band microstrip line is connected with a head end of equiangular spiral antenna section, the head end of ground plate microstrip line is connected with another head end of equiangular spiral antenna section, the end of center conduction band microstrip line connects the inner wire of coaxial cable sub-miniature A connector, and the end of ground plate microstrip line connects the outer conductor of coaxial cable sub-miniature A connector.
The initial spiral angle of described equiangular spiral antenna section is 0 degree, and stopping spiral angle is 3 π to 4 π, and the initial spiral angle of Archimedes's antenna segment is 3 π to 4 π, and stopping spiral angle is 11 π to 12 π.
Advantage of the present utility model: the utility model is in conjunction with the relative merits of equiangular spiral antenna and Archimedes's antenna structure, form a kind of helical antenna of composite screw structure, both overcome the bad shortcoming of equiangular spiral antenna low frequency characteristic, overcome the shortcoming that the signal attenuation of Archimedian spiral antenna brachium is big, transfer efficiency is low again, and size reduces greatly than equiangular spiral antenna, have great bandwidth and good stationary wave characteristic, according to designing requirement and actual measurement, on the bandwidth of 300MHz-3GHz, the standing-wave ratio (SWR) of this uhf sensor is less than 2.0.
Description of drawings
Fig. 1 is equiangular spiral antenna section and the distributed architecture synoptic diagram of Archimedes's antenna segment on antenna substrate of uhf sensor described in the utility model;
Fig. 2 is the microstrip line distribution schematic diagram of pro and con on the micro-strip line substrate;
Fig. 3 is the standing-wave ratio (SWR) curve map of uhf sensor described in the utility model; The every lattice of ordinate standing-wave ratio (SWR) among the figure are expressed as 1;
Fig. 4 is the distribution schematic diagram of existing equiangular spiral antenna;
Fig. 5 is the distribution schematic diagram of existing Archimedes's antenna.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, Fig. 2, Fig. 4 and Fig. 5, the described uhf sensor for the cable local discharge on-line monitoring of present embodiment, it comprises antenna substrate 1, equiangular spiral antenna section 2, Archimedes's antenna segment 3, micro-strip line substrate 4, center conduction band microstrip line 5 and ground plate microstrip line 6
On the antenna substrate 1 by the center to outer shroud direction spiral successively arrange equiangular spiral antenna section 2 and Archimedes's antenna segment 3, two ends of equiangular spiral antenna section 2 and two head ends of Archimedes's antenna segment 3 connect one to one;
The center of micro-strip line substrate 4 first end-sides has outstanding rectangle joint pin, and the front center of this micro-strip line substrate 4 is coated with center conduction band microstrip line 5 by head end to end, and the reverse side center of this micro-strip line substrate 4 is coated with ground plate microstrip line 6 by head end to end,
The impedance matching of center conduction band microstrip line 5 and ground plate microstrip line 6 is 140 ohm to 50 ohm by head end to end, the head end width of center conduction band microstrip line 5 and ground plate microstrip line 6 is identical, centered by the ground plate microstrip line 6 terminal width 5 times of conduction band microstrip line 5 terminal width, both width are exponential form from head end to end and increase;
The rectangle joint pin of micro-strip line substrate 4 passes the center of antenna substrate 1, the head end of center conduction band microstrip line 5 is connected with a head end of equiangular spiral antenna section 2, the head end of ground plate microstrip line 6 is connected with another head end of equiangular spiral antenna section 2, the end of center conduction band microstrip line 5 connects the inner wire of coaxial cable sub-miniature A connector, and the end of ground plate microstrip line 6 connects the outer conductor of coaxial cable sub-miniature A connector;
The material of equiangular spiral antenna section 2, Archimedes's antenna segment 3, center conduction band microstrip line 5 and ground plate microstrip line 6 is copper.
In the present embodiment, equiangular spiral antenna section 2 and Archimedes's antenna segment 3 are covered copper through printed-board technology at antenna substrate 1 and are realized.
Impedance matching in the present embodiment is to be realized by the center conduction band microstrip line 5 of index gradual change and ground plate microstrip line 6 structures, this index gradual change microstrip line construction realizes by printed-board technology double-sided copper-clad on micro-strip line substrate 4 that also the sectional dimension of center conduction band microstrip line 5 and ground plate microstrip line 6 is all made the form of gradual change to realize the coupling of characteristic impedance of antenna and measurement circuit characteristic impedance.
Embodiment two: present embodiment is described below in conjunction with Fig. 1 to Fig. 3, present embodiment is described further embodiment one, the initial spiral angle of the described equiangular spiral antenna section 2 of present embodiment is 0 degree, stopping spiral angle is 3 π to 4 π, the initial spiral angle of Archimedes's antenna segment 3 is 3 π to 4 π, and stopping spiral angle is 11 π to 12 π.
Utilize Electromagnetic Simulation software Ansoft HFSS that described uhf sensor is carried out emulation, by the isoparametric a large amount of simulation optimizations of spiral start-stop radius, impedance matching plate length and first and last end width thereof to antenna, can draw in designed frequency band is the scope of 300MHz-3GHz, make the standing-wave ratio (SWR) of sensor reach each parameter value of minimum value.
Shown in Figure 3, be the measured result of uhf sensor stationary wave characteristic described in the utility model, measure and adopt the AV3620 network analyzer, by diagram as can be known, in the frequency band of 300MHz-3GHz, the standing-wave ratio (SWR) of sensor is less than 2.0.
Claims (2)
1. uhf sensor that is used for the cable local discharge on-line monitoring, it is characterized in that, it comprises antenna substrate (1), equiangular spiral antenna section (2), Archimedes's antenna segment (3), micro-strip line substrate (4), center conduction band microstrip line (5) and ground plate microstrip line (6)
Antenna substrate (1) is gone up by the center to outer shroud direction spiral successively arrange equiangular spiral antenna section (2) and Archimedes's antenna segment (3), and two ends of equiangular spiral antenna section (2) and two head ends of Archimedes's antenna segment (3) connect one to one;
The center of micro-strip line substrate (4) first end-side has outstanding rectangle joint pin, the front center of this micro-strip line substrate (4) is coated with center conduction band microstrip line (5) by head end to end, the reverse side center of this micro-strip line substrate (4) is coated with ground plate microstrip line (6) by head end to end
The rectangle joint pin of micro-strip line substrate (4) passes the center of antenna substrate (1), the head end of center conduction band microstrip line (5) is connected with a head end of equiangular spiral antenna section (2), the head end of ground plate microstrip line (6) is connected with another head end of equiangular spiral antenna section (2), the end of center conduction band microstrip line (5) connects the inner wire of coaxial cable sub-miniature A connector, and the end of ground plate microstrip line (6) connects the outer conductor of coaxial cable sub-miniature A connector.
2. the uhf sensor for the cable local discharge on-line monitoring according to claim 1 is characterized in that,
The initial spiral angle of described equiangular spiral antenna section (2) is 0 degree, and stopping spiral angle is 3 π to 4 π, and the initial spiral angle of Archimedes's antenna segment (3) is 3 π to 4 π, and stopping spiral angle is 11 π to 12 π.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201878245U CN203149078U (en) | 2013-04-15 | 2013-04-15 | Ultrahigh frequency sensor for on-line monitoring of cable partial discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201878245U CN203149078U (en) | 2013-04-15 | 2013-04-15 | Ultrahigh frequency sensor for on-line monitoring of cable partial discharge |
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| Publication Number | Publication Date |
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| CN203149078U true CN203149078U (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013201878245U Expired - Fee Related CN203149078U (en) | 2013-04-15 | 2013-04-15 | Ultrahigh frequency sensor for on-line monitoring of cable partial discharge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134858A (en) * | 2014-08-06 | 2014-11-05 | 西安电子科技大学 | Loop coupling broadband miniaturized conical helical antenna |
| CN110364812A (en) * | 2019-07-31 | 2019-10-22 | 歌尔股份有限公司 | A kind of circular polarized antenna and test macro for product test |
| CN111273142A (en) * | 2020-03-19 | 2020-06-12 | 上海电力大学 | Transformer partial discharge detection system |
-
2013
- 2013-04-15 CN CN2013201878245U patent/CN203149078U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134858A (en) * | 2014-08-06 | 2014-11-05 | 西安电子科技大学 | Loop coupling broadband miniaturized conical helical antenna |
| CN110364812A (en) * | 2019-07-31 | 2019-10-22 | 歌尔股份有限公司 | A kind of circular polarized antenna and test macro for product test |
| CN110364812B (en) * | 2019-07-31 | 2020-11-10 | 歌尔股份有限公司 | Circularly polarized antenna for product test and test system |
| CN111273142A (en) * | 2020-03-19 | 2020-06-12 | 上海电力大学 | Transformer partial discharge detection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20150415 |
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| EXPY | Termination of patent right or utility model |