CN202661586U - GIS (Geographic Information System) partial discharging ultrahigh frequency signal measuring system - Google Patents
GIS (Geographic Information System) partial discharging ultrahigh frequency signal measuring system Download PDFInfo
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- CN202661586U CN202661586U CN 201220217176 CN201220217176U CN202661586U CN 202661586 U CN202661586 U CN 202661586U CN 201220217176 CN201220217176 CN 201220217176 CN 201220217176 U CN201220217176 U CN 201220217176U CN 202661586 U CN202661586 U CN 202661586U
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Abstract
The utility model relates to a GIS (Geographic Information System) partial discharging ultrahigh frequency signal measuring antenna device based on Hilbert theory, and in particular relates to a GIS (Geographic Information System) partial discharging ultrahigh frequency signal measuring system. The GIS partial discharging ultrahigh frequency signal measuring system is characterized by comprising a Hilbert fractal antenna, wherein the Hilbert fractal antenna is connected with an oscilloscope through a signal conditioning circuit so as to filter and amplify an antenna signal and then output the amplified signal for displaying. With the adoption of the GIS partial discharging ultrahigh frequency signal measuring system provided by the utility model, the GIS partial discharging ultrahigh frequency signal can be measured, and moreover, the system is high in sensitivity, and high in interference resistance.
Description
Technical field
The utility model relates to a kind of GIS local discharge superhigh frequency signal measurement antenna assembly based on the Hilbert theory, especially a kind of GIS local discharge superhigh frequency Signal Measurement System.
Background technology
All-closed gas insulating combined electrical apparatus (GIS) is little with its occupation of land space, high reliability has become the visual plant in the modern power systems.For guaranteeing its safe and stable operation, the on-line monitoring that insulate in the GIS has been become increasingly important research topic.Show as insulation the early stage of GIS insulation fault and puncture front shelf depreciation fully, operating GIS is carried out the on-line monitoring of shelf depreciation so use the antenna means, can effectively find GIS built-in electrical insulation defective, provide in case of necessity and report to the police and fault diagnosis, avoid occuring major accident.
The electromagnetic wave that ultrahigh frequency method (Ultra High Frequency) is sent when receiving shelf depreciation in the GIS detects shelf depreciation.The partial discharge pulse of this fast rise time delay is contained from direct current to the frequency content that surpasses 1GHz.Studies show that because the coaxial configuration of GIS is a good waveguiding structure, ultrahigh frequency (300MHz-3GHz) electromagnetic wave within it section is propagated effectively, and signal attenuation is less.The frequency of the main electromagnetic interference signal such as corona discharge is generally below 150MHz in the electric system, and propagates in air, and it is very fast to decay.Can select the electromagnetic signal of hyper band as detection signal, carry out the electric signal measurement of shelf depreciation with the antenna of appropriate frequency bands scope, avoiding the interference in the electric system that conventional electric test method is difficult to avoid, thereby improve the Partial Discharge Detection signal to noise ratio (S/N ratio).Simultaneously, because the rising edge of UHF signal is the ns level, velocity of propagation is near the light velocity; Can not penetrating metal the surface, and can only reflect and diffraction, also be convenient to the location of trouble spot when having determined with UHF method detection GIS shelf depreciation.
The utility model content
The purpose of this utility model provides a kind of GIS local discharge superhigh frequency Signal Measurement System, can measure GIS local discharge superhigh frequency signal, and highly sensitive, antijamming capability is strong.
A kind of GIS local discharge superhigh frequency Signal Measurement System, its special feature is: comprise the Hilbert fractal antenna, thereby this Hilbert fractal antenna is connected with oscillograph with aerial signal filtering, amplifies rear output for showing by signal conditioning circuit.
Wherein signal conditioning circuit is comprised of the Hi-pass filter that is connected and rf gain module, and wherein the signal input part of Hi-pass filter is connected with the output terminal of Hilbert fractal antenna, and the signal output part of rf gain module is connected with oscillograph.
Wherein Hi-pass filter adopts the single order high-pass filtering, and cutoff frequency is 200MHz, and the rf gain module has the 15dB fixed gain, operating frequency range 50MHz-4GHz.
Wherein the Hilbert fractal antenna is comprised of dielectric-slab, conductor layer and ground plane successively, and wherein dielectric-slab adopts Rogers RO4000 HF link plate material.
Wherein conductor layer arranges according to the Hilbert fractal principle, forms the receiving antenna unit, and the coverage rate of conductor layer on dielectric-slab be rectangular surfaces, is provided with feeding point at this conductor layer.
The utility model adopts the characteristics of fractal antenna broadband, miniaturization to make up the Hilbert fractal antenna that detects the GIS shelf depreciation, Antenna Design frequency band 300MHz-3GHz, frequency range internal antenna voltage standing wave ratio (VSWR) VSWR≤5 require to determine with Ansoft HFSS Electromagnetic Simulation software the concrete size of dielectric-slab, conductor layer, ground plane and the feeding point particular location of fractal antenna in conjunction with Partial Discharge Measuring Technology.The dielectric-slab material is chosen as Rogers RO4000 series HF link plate material, and FR4 compares with the common printed circuit board material, and loss is low, tolerance is low and have excellent high frequency performance.And its temperature coefficient of permittivity almost is minimum in the same type of material, and in wide frequency ranges, specific inductive capacity is quite stable also, is applicable to the wideband application so that change material.Because its thermal expansivity is close with copper, can provide excellent dimensional stability.Hi-pass filter and rf gain module form signal conditioning circuit, Hi-pass filter adopts the single order high-pass filtering, the design cutoff frequency is 200MHz, the rf gain module has the 15dB fixed gain, operating frequency range 50MHz-4GHz, the inner and 50 Ω resistors match of input and output, the gain module that mates by inside provides great dynamic range, in whole 4GHz frequency range, also provide simultaneously extremely low noise figure and very high OIP3 specifications parameter.
Description of drawings
Fig. 1 is the general structure synoptic diagram of GIS local discharge superhigh frequency Signal Measurement System described in the utility model;
Fig. 2 is the voltage standing wave ratio (VSWR) synoptic diagram of measuring system Hilbert fractal antenna described in the utility model;
Fig. 3 is the gain-frequency characterisitic of measuring system rf gain module described in the utility model.
Embodiment
As shown in Figure 1, a kind of GIS local discharge superhigh frequency Signal Measurement System comprises the Hilbert fractal antenna, thereby this Hilbert fractal antenna is connected aerial signal filtering, amplifies rear output for showing by signal conditioning circuit with oscillograph.
Wherein signal conditioning circuit is comprised of the Hi-pass filter that is connected and rf gain module, and wherein the signal input part of Hi-pass filter is connected with the output terminal of Hilbert fractal antenna, and the signal output part of rf gain module is connected with oscillograph.Hi-pass filter adopts the single order high-pass filtering, and cutoff frequency is 200MHz, and the rf gain module has the 15dB fixed gain, operating frequency range 50MHz-4GHz.
And the Hilbert fractal antenna is comprised of dielectric-slab (1), conductor layer (2) and ground plane (4) successively, and wherein dielectric-slab (1) adopts Rogers RO4000 series HF link plate material.Conductor layer (2) arranges according to the Hilbert fractal principle, forms the receiving antenna unit, and the coverage rate of conductor layer (2) on dielectric-slab (1) be rectangular surfaces, is provided with feeding point (3) at this conductor layer (2).
Embodiment 1:
As shown in Figure 1, GIS local discharge superhigh frequency Signal Measurement System of the present utility model, the signal conditioning circuit that comprise ultrahigh frequency Hilbert fractal antenna, is connected with antenna, and the oscillograph that is connected with signal conditioning circuit.
Ultrahigh frequency Hilbert fractal antenna comprises dielectric-slab (1), conductor layer (2), feeding point (3) and ground plane (4).Antenna places GIS outside, receives the local discharge superhigh frequency signal that radiates from disc insulator.Antenna is drawn radio-frequency cable from feeding point (3) by sub-miniature A connector, is connected to Hi-pass filter, then is connected with the rf gain module by radio-frequency cable, finally delivers to oscillograph.Hilbert fractal antenna dielectric-slab (1) material is chosen as Rogers RO4000 series HF link plate material, specifically selects RO4003 or RO4350 material.The selection of dielectric-slab (1) thickness can be determined according to the method for micro-strip paster antenna, and finely tune as required.
Can also change antenna performance by fractal exponent number, Outside Dimensions, the conductor width that changes antenna conductor layer (2), wherein, exponent number is higher, and the antenna frequencies tuning-points is more, voltage standing wave ratio (VSWR) is lower on the whole; Outside Dimensions is larger, and antenna resonant frequency will reduce.And by changing the position of antenna feed point (3), change the size of antenna radiation pattern, output impedance, then affect the overall performance of antenna.
As shown in Figure 2, be the voltage standing wave ratio (VSWR) VSWR of quadravalence Hilbert fractal antenna under two kinds of Outside Dimensions, in all the other parameters, dielectric-slab (1) is selected Rogers RO4003, thickness 5mm, conductor width 2mm.Because the self-similarity nature of fractal antenna, the standing-wave ratio (SWR) curve has certain repeatability, relatively-stationary frequency interval is arranged, and the antenna periphery size increases, and standing-wave ratio (SWR) VSWR reduces, and resonance frequency reduces, and frequency interval reduces.
Hi-pass filter and rf gain module form signal conditioning circuit, Hi-pass filter adopts the single order high-pass filtering, the design cutoff frequency is 200MHz, the rf gain module has the 15dB fixed gain, operating frequency range 50MHz-4GHz, gain-frequency characterisitic as shown in Figure 3, inner and the 50 Ω resistors match of input and output, gain module by the inside coupling provides great dynamic range, in whole 4GHz frequency range, also provide simultaneously extremely low noise figure and very high OIP3 specifications parameter.
During actual measurement, connect oscillograph after cable and the 50 Ω impedance matchings, 1M Ω is selected in oscillograph input impedance, because the frequency range of the ultra-high frequency signal of surveying for observing the pulse waveform of GIS shelf depreciation, transfers to the ns level with the oscillograph time shaft, the selection single triggers, and measures and the tracer signal waveform.Under the laboratory condition, can not add first test product, testing transformer is boosted to the test product load voltage value, measure the also ground unrest of tracer signal.If noise level is not up to standard, then should manage noise reduction or pass through tracer signal before, noise is separated from the local discharge signal of actual measurement.And under the GIS field condition, do not possess the measuring condition of ground unrest, and then can only signal analyze behind the record, compare by the feature such as frequency spectrum and laboratory result, come judgment device whether the shelf depreciation of shelf depreciation and which kind of type occurs.
Although content of the present utility model has been done detailed introduction by above-mentioned specific embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be apparent.
Claims (5)
1. a GIS local discharge superhigh frequency Signal Measurement System is characterized in that: comprise the Hilbert fractal antenna, thereby this Hilbert fractal antenna is connected with oscillograph with aerial signal filtering, amplifies rear output for showing by signal conditioning circuit.
2. a kind of GIS local discharge superhigh frequency Signal Measurement System as claimed in claim 1, it is characterized in that: wherein signal conditioning circuit is comprised of the Hi-pass filter that is connected and rf gain module, wherein the signal input part of Hi-pass filter is connected with the output terminal of Hilbert fractal antenna, and the signal output part of rf gain module is connected with oscillograph.
3. a kind of GIS local discharge superhigh frequency Signal Measurement System as claimed in claim 2, it is characterized in that: wherein Hi-pass filter adopts the single order high-pass filtering, cutoff frequency is 200MHz, and the rf gain module has the 15dB fixed gain, operating frequency range 50MHz-4GHz.
4. a kind of GIS local discharge superhigh frequency Signal Measurement System as claimed in claim 1, it is characterized in that: wherein the Hilbert fractal antenna is comprised of dielectric-slab (1), conductor layer (2) and ground plane (4) successively, and wherein dielectric-slab (1) adopts Rogers RO4000 HF link plate material.
5. such as the described a kind of GIS local discharge superhigh frequency Signal Measurement System of any one in the claim 1 to 4, it is characterized in that: wherein conductor layer (2) arranges according to the Hilbert fractal principle, form the receiving antenna unit, and the coverage rate of conductor layer (2) on dielectric-slab (1) is rectangular surfaces, is provided with feeding point (3) at this conductor layer (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220217176 CN202661586U (en) | 2012-05-15 | 2012-05-15 | GIS (Geographic Information System) partial discharging ultrahigh frequency signal measuring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220217176 CN202661586U (en) | 2012-05-15 | 2012-05-15 | GIS (Geographic Information System) partial discharging ultrahigh frequency signal measuring system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833907A (en) * | 2015-05-27 | 2015-08-12 | 华北电力大学（保定） | System for testing GIS partial discharge and VFTO |
| CN104931868A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Partial discharge detection device |
| FR3024240A1 (en) * | 2014-07-28 | 2016-01-29 | Alstom Technology Ltd | PARTIAL DISCHARGE DETECTION DEVICE WITH FRACTALLY ARCHITECTURED ANTENNA |
| CN105606971A (en) * | 2016-02-24 | 2016-05-25 | 国网江西省电力科学研究院 | Intelligent ultrahigh frequency sensor for electrical equipment partial discharge detection |
-
2012
- 2012-05-15 CN CN 201220217176 patent/CN202661586U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104833907A (en) * | 2015-05-27 | 2015-08-12 | 华北电力大学（保定） | System for testing GIS partial discharge and VFTO |
| CN104833907B (en) * | 2015-05-27 | 2018-09-18 | 华北电力大学（保定） | A kind of measuring system of GIS partial discharge and VFTO |
| CN104931868A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Partial discharge detection device |
| CN105606971A (en) * | 2016-02-24 | 2016-05-25 | 国网江西省电力科学研究院 | Intelligent ultrahigh frequency sensor for electrical equipment partial discharge detection |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20180515 |