CN105606971A - Intelligent ultrahigh frequency sensor for electrical equipment partial discharge detection - Google Patents
Intelligent ultrahigh frequency sensor for electrical equipment partial discharge detection Download PDFInfo
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- CN105606971A CN105606971A CN201610098754.4A CN201610098754A CN105606971A CN 105606971 A CN105606971 A CN 105606971A CN 201610098754 A CN201610098754 A CN 201610098754A CN 105606971 A CN105606971 A CN 105606971A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/1227—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 of components, parts or materials
Abstract
The invention relates to an intelligent ultrahigh frequency sensor for electrical equipment partial discharge detection. The sensor comprises an enclosed Hilbert fractal antenna, a signal conditioning module, a wireless communication module and a power supply module, wherein the enclosed Hilbert fractal antenna comprises a lead paster, a medium substrate, a grounding layer and a feeding probe, the lead paster is designed on the basis of an improved three-order Hilbert fractal curve and comprises an enclosed radiation arm of which two ends are mutually connected, the signal conditioning module comprises an amplification filtering unit, a peak value holding module and a data acquisition module, and the wireless communication module employs a WIFI wireless emission module. The sensor is suitable for internal partial discharge detection of electrical equipment such as a high voltage switch cabinet, a transformer, an electrical cable and GIS equipment.
Description
Technical field
The present invention relates to a kind of intelligent superfrequency sensor detecting for local discharge of electrical equipment, belong to Electric Power Equipment Insulation online measuring technique field.
Background technology
High voltage electric equipment often showed as progressively development and the enhancing of shelf depreciation (abbreviation office puts) before generation dielectric punctures, and the insulation fault usually office of originating from is put the insulation degradation causing. It is that deteriorated important sign occurs in insulation that office puts, and the degradation of insulation is higher, and office lets live moving stronger; Putting with the current political situation is also to cause further deteriorated major reason of insulation.
In the time that shelf depreciation occurs in the very little scope of inside electric appliance, breakdown process is very fast, will produce very steep pulse current, and its rise time is ns level, and stimulating frequency is up to hundreds of MHz and above electromagnetic wave. Superfrequency detection method is the superfrequency electromagnetic signal leaking out from inside electric appliance by detecting, and judges the defect situation of inside electric appliance. Because superfrequency detection method can effectively have been avoided on-the-spot low frequency corona interference, obtain in recent years research institution, manufacturer and Operation of Electric Systems department extensive concern and application.
Sensor Design is the key technology of partial-discharge ultrahigh-frequency detection method. The performance that sensor is good is successfully to realize the basic assurance that high-sensitivity local-discharge detects. At present, mainly contain loop aerial, flat helical antenna, probe-type antenna etc. for the superfrequency sensor of Partial Discharge Detection. Application experience shows that existing superfrequency sensor exists following problem: 1) measurement bandwidth is narrower, has lost more shelf depreciation information; 2) volume is large, and adopts cable transmission signal more, detects not convenient; 3) gain littlely, be unfavorable for receiving faint local discharge signal.
Summary of the invention
Object of the present invention, in order to overcome the shortcomings such as existing UHF-antenna measurement bandwidth is narrow, volume is large, the invention provides a kind of intelligent superfrequency sensor detecting for local discharge of electrical equipment; This sensor also possesses data processing and the function of transmission.
To achieve these goals, the present invention adopts following technical scheme:
A kind of intelligent superfrequency sensor, comprises closed Hilbert fractal antenna, signal condition module, wireless communication module and power module;
Described closed Hilbert fractal antenna, for receiving local discharge excited ultrahigh frequency electromagnetic wave signal;
Described signal condition module, for realizing the filtering of superfrequency discharge signal, amplification, peak value maintenance and data acquisition;
Described wireless communication module, for being emitted to Receiving Host by signal results;
Described power module, for signal condition module and wireless communication module power supply;
Described closed Hilbert fractal antenna connects described signal condition module; Described signal condition module connects described wireless communication module; Described power module connects signal condition module and wireless communication module.
Described intelligent superfrequency sensor, its operation principle is: the ultrahigh frequency electromagnetic wave signal that described closed Hilbert fractal antenna excites as reception antenna coupling shelf depreciation, and transfer to described signal condition module; The ultrahigh-frequency signal processing of described signal condition module to described closed Hilbert fractal antenna coupling, filter place interfering signal is also amplified signal, then obtain the crest voltage of signal by envelope detection mode, last data acquisition is also sent to described wireless communication module; Described wireless communication module is sent to main frame by WIFI mode by signal.
Further, described closed Hilbert fractal antenna comprises wire paster, medium substrate, ground plane and feed probes. The be laid in upper surface of medium substrate of described wire paster; The be laid in lower surface of medium substrate of described ground plane; Described wire paster is by feed probes feed.
Further, described wire paster comprises the sealing radiation arm that joins end to end and form, and described radiation arm arranges according to three rank Hilbert fractal curves; Described radiation arm is provided with distributing point, and described feed position is arranged on the conducting line segment close to the geometric center point place of described radiation arm.
Further, the coverage rate of described wire paster in medium substrate is rectangular surfaces.
Further, the length of side of the coverage rate of described wire paster in medium substrate is 76mm; The width of described radiation arm is 2mm; The spacing of described radiation arm is 2mm.
Further, described medium substrate is TaconicRF-35 dielectric-slab, and its dielectric constant is 3.5; The thickness 5mm of described medium substrate, the described medium substrate length of side is 86mm.
Further, described signal condition module comprises amplification filtering unit, peak value holding unit and data acquisition unit; The signal that amplification filtering unit is sent closed Hilbert fractal antenna here carries out amplification filtering, deliver to peak value holding unit obtains discharge signal crest voltage by envelope detection mode, deliver to data acquisition unit, the data after having gathered send to wireless communication module again.
Further, described amplification filtering unit is made up of bandpass filter and low-noise amplifier, and described bandpass filter possesses filtering mobile phone interfering signal function.
Further, described wireless communication module adopts WIFI wireless transmitter module.
The present invention has following beneficial effect: sensor of the present invention has multiple measurement bandwidths at 300MHz within the scope of 1.0GHz, and impedance bandwidth (VSWR < 5) can reach 80%, can record the most information of shelf depreciation, can not cause omission situation. Sensor signal half-power beam angle of the present invention is wide, and in omnirange, directional difference is little. Can effectively receive the local discharge signal from dead ahead, detection sensitivity is high. Sensor of the present invention possesses data processing function, can carry out down conversion process to superfrequency discharge signal, and retains its peak phase feature, has reduced data acquisition cost. Sensor of the present invention adopts wireless telecommunications, connects without the need for line, improves and detects security and convenience.
Brief description of the drawings
Fig. 1 is intelligent superfrequency Fundamentals of Sensors block diagram;
Fig. 2 is closed Hilbert fractal antenna structural representation;
Fig. 3 is improved 3 rank Hilbert fractal curves, i.e. described wire paster
Fig. 4 is actual measurement standing-wave ratio figure of the present invention;
Fig. 5 is actual measurement directional diagram of the present invention, and wherein (a) is phi=0 °, 653MHz place directional diagram, is (b) phi=90 °, 653MHz place directional diagram;
In figure, the 1st, closed Hilbert fractal antenna, the 2nd, signal condition module, the 3rd, wireless communication module, the 4th, power module, the 5th, amplification filtering unit, the 6th, peak value holding unit, the 7th, data acquisition unit, the 8th, wire paster, the 9th, medium substrate, the 10th, ground plane, the 11st, feed probes, the 12nd, the fractal radiation arm of closed Hilbert, the 13rd, distributing point.
Detailed description of the invention
Below in conjunction with specific embodiment, further set forth the present invention.
The present embodiment intelligence superfrequency sensor setting has the signal condition module 2, wireless communication module 3 and the power module 4 that are connected in the 1 signal output of sealing Hilbert fractal antenna, as shown in Figure 1.
Signal condition module 2 comprises amplification filtering unit 5, peak value holding unit 6 and data acquisition unit 7. Amplification filtering unit is used for filtering interfering, and amplifying signal, is made up of bandpass filter and low-noise amplifier. Because mobile phone interfering frequency is in superfrequency measurement bandwidth, need to adopt trapper filtering. Therefore, bandpass filter is formed by low pass, high-pass filter and trapper cascade, can select elliptic function filter prototype. Low-noise amplifier is made up of field-effect transistor, input-output adapt ation network, power filter, direct current biasing etc.
The high sampling rate of data acquisition unit is 50MHz, and A/D resolution ratio is 12bit. Data after collection completes send to wireless communication module.
Wireless communication module adopts the wireless signal transmitting module based on WIFI principle, by WIFI mode, signal is sent to main frame.
Fig. 2 be shown in closed Hilbert fractal antenna structural representation; Closed Hilbert fractal antenna comprises wire paster 8, medium substrate 9, ground plane 10 and feed probes 11; At medium substrate 9 upper surfaces, be laid with wire paster 8; The be laid in lower surface of medium substrate 9 of ground plane 10; Described wire paster is by feed probes 11 feeds.
The superfrequency discharge signal frequency that sealing Hilbert fractal antenna detects is very high, is subject to the restriction of data acquisition and storage, is difficult to real-time monitored signal original waveform. Described peak value holding unit employing high frequency detector diode obtains the crest voltage of discharge signal by envelope detection mode, and continuation width signal duration, to meet the requirement of general digital collection system.
Fig. 3 is improved 3 rank Hilbert fractal curves, i.e. described wire paster, and described distributing point 13 is positioned on the conducting line segment close to the geometric center point place of described radiation arm 12; Fig. 4 and Fig. 5 are that the antenna conductor paster coverage rate length of side is 76mm, and radiation arm width is 2mm, and radiation arm spacing is 2mm, medium substrate is TaconicRF-35 dielectric-slab, medium substrate length of side value 86mm, when medium substrate thickness is 5mm, actual measurement standing-wave ratio figure and the directional diagram of antenna; Wherein Fig. 5 (a) is phi=0 °, 653MHz place directional diagram, and Fig. 5 (b) is phi=90 °, 653MHz place directional diagram.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention. Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (8)
1. the intelligent superfrequency sensor detecting for local discharge of electrical equipment, is characterized in that, comprising:
Closed Hilbert fractal antenna, for receiving local discharge excited ultrahigh frequency electromagnetic wave signal;
Signal condition module, for realizing the filtering of superfrequency discharge signal, amplification, peak value maintenance and data acquisition;
Wireless communication module, for being emitted to Receiving Host by signal results;
Power module, for signal condition module and wireless communication module power supply;
Described closed Hilbert fractal antenna connects described signal condition module; Described signal condition module connects described wireless communication module; Described power module connects signal condition module and wireless communication module.
According to claim 1 a kind of for local discharge of electrical equipment detect intelligent superfrequency sensor, it is characterized in that, described closed Hilbert fractal antenna comprises wire paster, medium substrate, ground plane and feed probes; The be laid in upper surface of medium substrate of described wire paster; The be laid in lower surface of medium substrate of described ground plane; Described wire paster is by feed probes feed.
According to claim 2 a kind of for local discharge of electrical equipment detect intelligent superfrequency sensor, it is characterized in that, described wire paster comprises the closed radiation arm that joins end to end and form, and described radiation arm arranges according to three rank Hilbert fractal curves; Described radiation arm is provided with distributing point, and described feed position is arranged on the conducting line segment close to the geometric center point place of described radiation arm.
According to claim 2 a kind of for local discharge of electrical equipment detect intelligent superfrequency sensor, it is characterized in that, the coverage rate of described wire paster in medium substrate is rectangular surfaces.
According to claim 2 a kind of for local discharge of electrical equipment detect intelligent superfrequency sensor, it is characterized in that, the length of side of the coverage rate of described wire paster in medium substrate is 76mm; The width of described radiation arm is 2mm; The spacing of described radiation arm is 2mm; Described medium substrate is TaconicRF-35 dielectric-slab, and its dielectric constant is 3.5; The thickness 5mm of described medium substrate, the described medium substrate length of side is 86mm.
According to claim 1 a kind of for local discharge of electrical equipment detect intelligent superfrequency sensor, it is characterized in that, described signal condition module comprises amplification filtering unit, peak value holding unit and data acquisition unit; The signal that amplification filtering unit is sent closed Hilbert fractal antenna here carries out amplification filtering, deliver to peak value holding unit obtains discharge signal crest voltage by envelope detection mode, deliver to data acquisition unit, the data after having gathered send to wireless communication module again.
According to claim 6 a kind of for local discharge of electrical equipment detect intelligent superfrequency sensor, it is characterized in that, described amplification filtering unit is made up of bandpass filter and low-noise amplifier; Described bandpass filter possesses filtering mobile phone interfering signal function.
8. a kind of intelligent superfrequency sensor detecting for local discharge of electrical equipment according to claim 1, is characterized in that, described wireless communication module adopts WIFI wireless transmitter module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610098754.4A CN105606971A (en) | 2016-02-24 | 2016-02-24 | Intelligent ultrahigh frequency sensor for electrical equipment partial discharge detection |
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| CN201610098754.4A CN105606971A (en) | 2016-02-24 | 2016-02-24 | Intelligent ultrahigh frequency sensor for electrical equipment partial discharge detection |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106841959A (en) * | 2017-04-06 | 2017-06-13 | 上海交通大学 | For the intelligent high frequency local discharge sensor of power cable Partial Discharge Detection |
| CN107643471A (en) * | 2017-10-27 | 2018-01-30 | 国家电网公司 | A kind of electrical equipment intermittent defect detects positioner |
| WO2018152983A1 (en) * | 2017-02-23 | 2018-08-30 | 全球能源互联网研究院有限公司 | Ultrahigh-frequency sensor and online partial discharge monitoring system |
| CN110456143A (en) * | 2019-08-19 | 2019-11-15 | 三峡大学 | The transformer belt electricity condition detection device of survey is sentenced based on light current magnetic signal |
| CN110554285A (en) * | 2019-09-02 | 2019-12-10 | 中铁工程设计咨询集团有限公司 | self-adaptive environmental noise suppression partial discharge monitoring method |
| CN110780237A (en) * | 2019-09-18 | 2020-02-11 | 国网北京市电力公司 | Distributed ultrahigh frequency sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018152983A1 (en) * | 2017-02-23 | 2018-08-30 | 全球能源互联网研究院有限公司 | Ultrahigh-frequency sensor and online partial discharge monitoring system |
| CN106841959A (en) * | 2017-04-06 | 2017-06-13 | 上海交通大学 | For the intelligent high frequency local discharge sensor of power cable Partial Discharge Detection |
| CN107643471A (en) * | 2017-10-27 | 2018-01-30 | 国家电网公司 | A kind of electrical equipment intermittent defect detects positioner |
| CN110456143A (en) * | 2019-08-19 | 2019-11-15 | 三峡大学 | The transformer belt electricity condition detection device of survey is sentenced based on light current magnetic signal |
| CN110554285A (en) * | 2019-09-02 | 2019-12-10 | 中铁工程设计咨询集团有限公司 | self-adaptive environmental noise suppression partial discharge monitoring method |
| CN110780237A (en) * | 2019-09-18 | 2020-02-11 | 国网北京市电力公司 | Distributed ultrahigh frequency sensor |
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