CN103257305A - External ultrahigh frequency detecting sensor and detecting method thereof - Google Patents
External ultrahigh frequency detecting sensor and detecting method thereof Download PDFInfo
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- CN103257305A CN103257305A CN2012100413880A CN201210041388A CN103257305A CN 103257305 A CN103257305 A CN 103257305A CN 2012100413880 A CN2012100413880 A CN 2012100413880A CN 201210041388 A CN201210041388 A CN 201210041388A CN 103257305 A CN103257305 A CN 103257305A
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Abstract
The invention provides an external ultrahigh frequency detecting sensor and a detecting method thereof. The external ultrahigh frequency detecting sensor comprises a substrate, a detecting device and a shielding case. The substrate is provided with a fixing portion used for fixing the ultrahigh frequency detecting sensor on a basin-type insulator. A signal hole is formed in the center of the substrate. The detecting device corresponding to the signal hole is arranged on the substrate and is used for detecting ultrahigh frequency signals in partial discharge signals, and outputting electric signals. The shielding case covers the exterior of the detecting device. The invention further provides a detecting method using the external ultrahigh frequency detecting sensor. The external ultrahigh frequency detecting sensor is fixed at an insulating medium injection port of a metal flange of the basin-type insulator through the substrate. The detecting device of the sensor is used for detecting the signals in an ultrahigh frequency range in the discharge signals, leaking from the insulating medium injection port to the exterior of a shell body of GIS equipment, of the discharge signals of partial discharge points, and outputting the signals. The external ultrahigh frequency detecting sensor is high in sensitivity, strong in anti-interference performance, convenient to maintain, and high in reliability.
Description
Technical field
The present invention relates to the electric power detection range, in particular to a kind of external superfrequency detecting sensor and detection method thereof.
Background technology
Along with society constantly increases the demand of electric power, power industry is rapidly developed, and the safe operation of large-scale power transmission network becomes the significant problem that power industry is paid close attention to.Studies show that gas insulated combined electrical equipment and potential device inside are more with insulation fault, and the tendency of insulation fault often shows as shelf depreciation, it is generally acknowledged that the shelf depreciation in the high-tension apparatus has a strong impact on Electric Field Distribution, causes electric field distortion, the insulating material corrosion finally causes insulation breakdown.
The method of Partial Discharge Detection is a lot, all is according to the physics that takes place in the shelf depreciation process and chemical effect generally.Method for measurement of partial discharge can be divided into electrical measuring method and non-electrical measuring method two big classes, and it specifically mainly can be divided into following five kinds of methods: pulse current method, superfrequency method, supercritical ultrasonics technology, chemical monitoring method, optical means etc.
Shelf depreciation in the gases at high pressure insulation unit equipments (GIS) is usually expressed as a kind of quick electromagnetic pulse signal, have very wide frequency band range, adopt superfrequency (UHF) thus detection method can be avoided interference band effectively and is conducive to discharge signal is detected.In the GIS detection method for local discharge, because the superfrequency method has higher sensitivity to local discharge signal, be applicable to the continuous on-line monitoring, so tool advantage and development potentiality.When using superfrequency (UHF) to detect, need to adopt the UHF antenna to obtain signal as sensor.Whether the superior performance of UHF antenna has directly influenced the effect quality of UHF detection method, and it is the core component of this superfrequency method detection technique, and its research and development had important effect.
The general employing is arranged on built-in UHF antenna (UHF sensor) in the insulating medium layer of GIS equipment in the prior art, built-in UHF sensor has the advantage highly sensitive, that antijamming capability is strong, but its shortcoming is also apparent in view: built-in UHF sensor can only be buried underground in the manufacturer production process in advance, and when UHF sensor faults itself, it is all very inconvenient to safeguard with verification, thereby causes not having guarantee serviceable life.In addition, be built in the normal operation that UHF sensor in the insulating medium layer of GIS equipment may influence GIS equipment.Therefore, there is bigger limitation in the actual use of built-in UHF sensor.
Summary of the invention
The present invention aims to provide a kind of easy to use and reliable external superfrequency detecting sensor, to solve the awkward problem of built-in superfrequency detecting sensor.
The invention provides a kind of external superfrequency detecting sensor, comprising: pedestal, be provided with for the fixed part that the superfrequency sensor is fixed on the disc insulator, the center of pedestal is provided with telltale hole; Pick-up unit, be arranged on pedestal on corresponding with telltale hole, for detection of the ultrahigh-frequency signal in the local discharge signal, and the output electric signal; Radome is located at the pick-up unit outside.
Further, pick-up unit comprises detection module, and detection module comprises: antenna substrate is fixedly installed on the pedestal; Antenna patch is arranged on the antenna substrate, the corresponding setting with telltale hole of antenna patch.
Further, pick-up unit also comprises output module, and output module comprises: the feeder line substrate be arranged in parallel with antenna substrate; Feeder line is arranged on the feeder line substrate and with the outer, coaxial cable and is connected; Ground plate is arranged between antenna substrate and the feeder line substrate, and the center of ground plate and antenna patch are provided with coupling aperture accordingly.
Further, the DIELECTRIC CONSTANT of antenna substrate
R1DIELECTRIC CONSTANT less than the feeder line substrate
R2
Further, antenna substrate adopts alumina material.
Further, the feeder line substrate adopts ptfe composite.
Further, the length L≤50mm of antenna patch, width D≤15mm, height H≤30mm.
Further, effective working band of external superfrequency detecting sensor is f, wherein, and 1GHz≤f≤1.5GHz, its centre frequency f
0Be 1.25GHz.
Further, the significant height of external superfrequency detecting sensor is h
e, 5.0mm≤h wherein
e≤ 8.0mm.
The present invention also provides a kind of detection method of using aforesaid external superfrequency detecting sensor, external superfrequency detecting sensor is arranged on the insulating medium inlet place of the metal flange of disc insulator, is the local discharge signal of 1GHz≤F≤1.5GHz for detection of the frequency range of revealing from the insulating medium inlet.
According to external superfrequency detecting sensor of the present invention and detection method thereof, external superfrequency detecting sensor is fixedly installed on the insulating medium inlet place of the metal flange of disc insulator by pedestal, the discharge signal that the pick-up unit of sensor detects shelf depreciation point is leaked to signal and the output of the ultrahigh frequency band the discharge signal of GIS apparatus casing outside from the insulating medium inlet, and radome is used for preventing the outer signals interference.Sensor can hot line job and charged detection, is convenient to safeguard the reliability height.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation according to external superfrequency detecting sensor of the present invention;
Fig. 2 is the STRUCTURE DECOMPOSITION synoptic diagram according to external superfrequency detecting sensor of the present invention; And
Fig. 3 is the mounting structure synoptic diagram according to external superfrequency detecting sensor of the present invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
As shown in Figure 1 to Figure 3, according to a kind of external superfrequency detecting sensor of the present invention, comprise pedestal 10, be provided with for the fixed part that the superfrequency sensor is fixed on the disc insulator 2 that the center of pedestal 10 is provided with telltale hole; Pick-up unit 20, be arranged on pedestal 10 on corresponding with telltale hole, for detection of the ultrahigh-frequency signal in the local discharge signal, and the output electric signal; Radome 30 is located at pick-up unit 20 outsides.External superfrequency detecting sensor is fixedly installed on insulating medium inlet 4 places of the metal flange of disc insulator 2 by pedestal 10, the discharge signal that the pick-up unit 20 of sensor detects shelf depreciation points 3 is leaked to signal and the output of the ultrahigh frequency band the discharge signal of GIS apparatus casing 1 outside from the insulating medium inlet, and radome 30 is used for preventing the outer signals interference.Sensor can hot line job and charged detection, is convenient to safeguard the reliability height.
As shown in Figure 2, pick-up unit 20 comprises detection module, and detection module comprises: antenna substrate 21 is fixedly installed on the pedestal 10; Antenna patch 22 is arranged on the antenna substrate 21, the corresponding setting with telltale hole of antenna patch 22.Pick-up unit 20 also comprises output module, and output module comprises: feeder line substrate 23 be arranged in parallel with antenna substrate 21; Feeder line 24 is arranged on the feeder line substrate 23 and with outer, coaxial cable 28 and is connected; Ground plate 25 is arranged between antenna substrate 21 and the feeder line substrate 23, and the center of ground plate 25 and antenna patch 22 are provided with coupling aperture 26 accordingly.What antenna patch 22 of the present invention adopted is micro-strip paster antenna.During working sensor, encourage electric current on the antenna patch 22, between antenna patch 22 and ground plate 25, produced vertical electric field.Press equivalent theory, this antenna can be regarded a resonator cavity as, comes the electromagnetic wave of received radiation with the form in slit.When the length of antenna paster 22 during near discharge signal wavelength X/2, antenna patch 22 produces resonance, produces very significantly electric current and electric field.
Sensor adopts the bore coupling scheme, bore coupling feed structure is at two parallel substrate therebetween one deck ground plates (antenna substrate 21, feeder line substrate 23 and ground plate 25), the antenna patch 22 on the antenna substrate 21 is coupled to feeder line 24 on the feeder line substrate 23 by the coupling aperture 26 on the ground plate 25 on, preferably, feeder line 24 adopts microstrip feed line.
Preferably, the DIELECTRIC CONSTANT of antenna substrate 21
R1DIELECTRIC CONSTANT less than feeder line substrate 23
R2Be the material manufacturing that antenna substrate 21 adopts low-k, be beneficial to promote radiation, feeder line substrate 23 adopts the high dielectric constant materials manufacturing, is beneficial to electromagnetic field is constrained in the feeder line 24, thereby improves bandwidth.Middle ground plate 25 can shield the parasitic radiation of self-feed line 24, avoids it that radiation on antenna substrate 21 is produced and disturbs, so bore coupling feeding classification can be improved cross polarization characteristics and the isolation of antenna, improves the standing-wave ratio (SWR) bandwidth.
More preferably, antenna substrate 21 adopts alumina material, and feeder line substrate 23 adopts ptfe composite, ε
R1=1.2, ε
R2=2.5.Satisfy the designing requirement of sensor on loss, temperature and dimensional stability, manufacturing homogeneity.
According to Jackson﹠amp; The experimental formula of Alexopolus frequency span (standing-wave ratio (SWR)＜2):
T wherein: the thickness of medium substrate, the width of W---microband paste, the length of L---microband paste, λ
0Free space wavelength, ε
r---relative dielectric constant, (t, W, L, λ
0Unit be m).
From following formula, as can be seen, reduce ε
r=ε
R1/ ε
R2, can improve frequency span.
In addition, the length L≤50mm of antenna patch 22, width D≤15mm, height H≤30mm, can make effective working band f of sensor is 1GHz≤f≤1.5GHz, its centre frequency f
0Be 1.25GHz.Be that the relative band width reaches 40%.Have good sensitivity and interference free performance simultaneously, the significant height h of the micro-strip paster antenna of sensor
eBe 5.0mm≤h
e≤ 8.0mm.Gain reaches more than the 5dB, has higher sensitivity.
In addition, the pulse energy of shelf depreciation almost is directly proportional with frequency span, and micro-strip paster antenna is narrow band antenna, the narrow-band characteristic of micro-strip paster antenna is that the resonance person's character by its high Q (quality factor) determines, the energy that namely is stored in the antenna structure is more much bigger than radiation and other energy loss, this just means, when at resonance, realized coupling and during frequency departure resonance reactive component sharply change and make it mismatch.Total quality factor q of antenna is:
Q in the formula
r, Q
cAnd Q
dRepresent radiation power P respectively
r, the conductor losses power P
c, the dielectric loss power P
dCaused corresponding Q value.
The micro-strip paster antenna relative band width of conventional design is about 1%～6% of centre frequency, does not satisfy the requirement of GIS Partial Discharge Detection, thus put information in order to obtain more office, should widening frequency band when design.The method of widening frequency band can be sought from the various aspects that reduce total Q value, also can realize with additional coupling measure.
According to above-mentioned theory, increase substrate thickness and can make radiation conductance increase the Q of radiation correspondence
rReduce with total Q value, make frequency band widen.
Also can adopt the additional impedance matching network: the equivalent electrical circuit of micro-strip paster antenna can be described with a RLC antiresonant circuit, feeder line can be considered an impedance property, can add a series capacitance this moment, form series resonant circuit with the feeder inductance, and make the equivalent antiresonant circuit of it and micro-strip paster antenna at same frequency upper resonance, near the reactance of series parallel resonance loop resonance frequency is tending towards disappearing, the rapid variation of reactance when having made it to avoid off-resonance, thus broadening frequency band.
Further, in order to reduce the signal reflex of ultrahigh-frequency signal in transmission course, improve effectiveness, can adopt the mode of impedance matching, namely allow the impedance of antenna approaching or consistent as far as possible with the impedance of coaxial wire (generally being considered as 50 Ω), like this, ultrahigh-frequency signal catadioptric situation in transmission is more weak, is conducive to the transmission of signal.
As shown in Figure 3, the present invention also provides a kind of detection method of using aforesaid external superfrequency detecting sensor, external superfrequency detecting sensor is arranged on insulating medium inlet 4 places of the metal flange of disc insulator 2, is the local discharge signal of 1GHz≤F≤1.5GHz for detection of the frequency range of revealing from insulating medium inlet 4.
When the GIS device interior shelf depreciation occurs and puts 3, because the shell 1 of GIS equipment is generally metal, local discharge signal is difficult to be radiated housing 1 outside, disc insulator 2 is insulator, and it has insulating medium inlet 4 at housing 1, and local discharge signal is radiated outside from insulating medium inlet 4, sensor is arranged on this, the testing fixture 20 of sensor internal namely can detect local discharge signal, and metallic shield 30 shields external signal effectively, prevents from disturbing.
As can be seen from the above description, the above embodiments of the present invention have realized following technique effect:
According to external superfrequency detecting sensor of the present invention and detection method thereof, sensor just can be obtained signal near near the operating GIS disc insulator, do not need GIS equipment is done any change, need not have a power failure, do not influence the normal operation of GIS.Utilize external UHF sensor to detect the UHF signal realization Partial Discharge Detection that radiates from disc insulator, and have higher sensitivity.
Sensor of the present invention is easy for installation, quick, stable and antijamming capability is strong, can significantly reduce the workload of GIS equipment routing inspection, improve the reliability of testing efficient and testing result, can reduce a large amount of material resources, financial resources and manpower for kiowatt, increase economic efficiency, ensure the security of operation of power equipment.Long-range angle sees, external ultrahigh frequency office puts sensor and can put detection system with office and be used, and can widen the scope of application to the detection of the local discharge signal of GIS equipment, transformer, high-tension cable etc.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an external superfrequency detecting sensor is characterized in that, comprising:
Pedestal (10) is provided with for the fixed part that described superfrequency sensor is fixed on the disc insulator (2), and the center of described pedestal (10) is provided with telltale hole;
Pick-up unit (20), be arranged on described pedestal (10) on corresponding with described telltale hole, for detection of the ultrahigh-frequency signal in the local discharge signal, and the output electric signal;
Radome (30) is located at described pick-up unit (20) outside.
2. external superfrequency detecting sensor according to claim 1 is characterized in that, described pick-up unit (20) comprises detection module, and described detection module comprises:
Antenna substrate (21) is fixedly installed on the described pedestal (10);
Antenna patch (22) is arranged on the described antenna substrate (21), the corresponding setting with described telltale hole of described antenna patch (22).
3. external superfrequency detecting sensor according to claim 2 is characterized in that, described pick-up unit (20) also comprises output module, and described output module comprises:
Feeder line substrate (23) be arranged in parallel with described antenna substrate (21);
Feeder line (24) is arranged on described feeder line substrate (23) and upward and with outer, coaxial cable (28) is connected;
Ground plate (25) is arranged between described antenna substrate (21) and the described feeder line substrate (23), and the center of described ground plate (25) and described antenna patch (22) are provided with coupling aperture (26) accordingly.
4. external superfrequency detecting sensor according to claim 3 is characterized in that, the DIELECTRIC CONSTANT of described antenna substrate (21)
R1DIELECTRIC CONSTANT less than described feeder line substrate (23)
R2
5. external superfrequency detecting sensor according to claim 4 is characterized in that, described antenna substrate (21) adopts alumina material.
6. external superfrequency detecting sensor according to claim 4 is characterized in that, described feeder line substrate (23) adopts ptfe composite.
7. external superfrequency detecting sensor according to claim 2 is characterized in that, the length L≤50mm of described antenna patch (22), width D≤15mm, height H≤30mm.
8. according to each described external superfrequency detecting sensor in the claim 2 to 7, it is characterized in that effective working band of described external superfrequency detecting sensor is f, wherein, 1GHz≤f≤1.5GHz, its centre frequency f
0Be 1.25GHz.
9. according to each described external superfrequency detecting sensor in the claim 2 to 7, it is characterized in that the significant height of described external superfrequency detecting sensor is h
e, 5.0mm≤h wherein
e≤ 8.0mm.
10. a right to use requires the detection method of each described external superfrequency detecting sensor in 1 to 9, it is characterized in that, described external superfrequency detecting sensor is arranged on the insulating medium inlet (4) of the metal flange of disc insulator (2) and locates, and is the local discharge signal of 1GHz≤F≤1.5GHz for detection of the frequency range of revealing from described insulating medium inlet (4).
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777121A (en) * | 2014-01-22 | 2014-05-07 | 上海交通大学 | Multi-band ultrahigh frequency narrow band sensor for transformer substation local discharge detecting and positioning |
| CN104569894A (en) * | 2015-01-27 | 2015-04-29 | 上海交通大学 | Partial discharge ultra-high frequency (UHF) sensor performance evaluation method based on time domain parameters |
| CN105593693A (en) * | 2013-10-01 | 2016-05-18 | 三菱电机株式会社 | Partial discharge sensor |
| CN105676094A (en) * | 2016-04-22 | 2016-06-15 | 国网浙江省电力公司电力科学研究院 | External sensor for GIS partial discharge detection |
| CN106841939A (en) * | 2016-12-23 | 2017-06-13 | 西安交通大学 | The portable acoustoelectric combined detection means of GIS partial discharge and its detection method |
| CN107462818A (en) * | 2017-09-02 | 2017-12-12 | 武汉大学 | GIS disc insulators pour the extra-high video sensor of the external partial discharge monitoring of mouth |
| CN107478964A (en) * | 2017-06-21 | 2017-12-15 | 国家电网公司 | Extra-high video sensor |
| CN110398704A (en) * | 2018-04-25 | 2019-11-01 | 西门子(深圳)磁共振有限公司 | Radio frequency system and its magnetic resonance system |
| CN112130047A (en) * | 2019-10-31 | 2020-12-25 | 三江学院 | External ultrahigh frequency sensor for GIS partial discharge detection |
| CN113866624A (en) * | 2021-09-27 | 2021-12-31 | 广东电网有限责任公司 | GIS partial discharge live-line testing device |
| CN114175431A (en) * | 2019-08-02 | 2022-03-11 | 西门子能源全球有限公司 | Connection structure with UHF antenna for gas-insulated switchgear |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105593693A (en) * | 2013-10-01 | 2016-05-18 | 三菱电机株式会社 | Partial discharge sensor |
| CN103777121A (en) * | 2014-01-22 | 2014-05-07 | 上海交通大学 | Multi-band ultrahigh frequency narrow band sensor for transformer substation local discharge detecting and positioning |
| CN104569894A (en) * | 2015-01-27 | 2015-04-29 | 上海交通大学 | Partial discharge ultra-high frequency (UHF) sensor performance evaluation method based on time domain parameters |
| CN105676094A (en) * | 2016-04-22 | 2016-06-15 | 国网浙江省电力公司电力科学研究院 | External sensor for GIS partial discharge detection |
| CN106841939A (en) * | 2016-12-23 | 2017-06-13 | 西安交通大学 | The portable acoustoelectric combined detection means of GIS partial discharge and its detection method |
| CN107478964A (en) * | 2017-06-21 | 2017-12-15 | 国家电网公司 | Extra-high video sensor |
| CN107478964B (en) * | 2017-06-21 | 2023-04-11 | 国家电网公司 | Ultrahigh frequency sensor |
| CN107462818A (en) * | 2017-09-02 | 2017-12-12 | 武汉大学 | GIS disc insulators pour the extra-high video sensor of the external partial discharge monitoring of mouth |
| CN107462818B (en) * | 2017-09-02 | 2024-02-27 | 武汉大学 | Ultrahigh frequency sensor for monitoring partial discharge of external pouring port of GIS basin-type insulator |
| CN110398704A (en) * | 2018-04-25 | 2019-11-01 | 西门子(深圳)磁共振有限公司 | Radio frequency system and its magnetic resonance system |
| CN110398704B (en) * | 2018-04-25 | 2021-09-17 | 西门子(深圳)磁共振有限公司 | Radio frequency system and magnetic resonance system thereof |
| CN114175431A (en) * | 2019-08-02 | 2022-03-11 | 西门子能源全球有限公司 | Connection structure with UHF antenna for gas-insulated switchgear |
| CN112130047A (en) * | 2019-10-31 | 2020-12-25 | 三江学院 | External ultrahigh frequency sensor for GIS partial discharge detection |
| CN113866624A (en) * | 2021-09-27 | 2021-12-31 | 广东电网有限责任公司 | GIS partial discharge live-line testing device |
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Application publication date: 20130821 |