CN103698673A - Drivepipe local discharge electrified detection device based on directional antenna array - Google Patents
Drivepipe local discharge electrified detection device based on directional antenna array Download PDFInfo
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- CN103698673A CN103698673A CN201310700671.4A CN201310700671A CN103698673A CN 103698673 A CN103698673 A CN 103698673A CN 201310700671 A CN201310700671 A CN 201310700671A CN 103698673 A CN103698673 A CN 103698673A
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Abstract
The invention discloses a drivepipe local discharge electrified detection device based on a directional antenna array. An electromagnetic wave signal radiated by local discharge is detected by virtue of the directional antenna array, and then is converted into a voltage signal so as to be output; a signal conditioner is used for receiving the voltage signal output by the directional antenna array, eliminating a received electromagnetic wave interference signal, amplifying the voltage signal and improving the signal-to-noise ratio; a high-speed signal collector is used for performing analog-to-digital conversion on the signal output by the signal conditioner and realizing the collection, storage and display of the digital signal. According to the device disclosed by the invention, a detection antenna is distributed in a safe region on the ground, so that the safety and reliability are high, and meanwhile, the sensor installation problem in the prior art is solved; the directional antenna array is adopted for detecting a drivepipe local discharge signal, and is combined with the signal conditioner, so that the drivepipe local discharge signal receiving gain is improved, meanwhile the drivepipe peripheral electromagnetic interference receiving gain is reduced, and strong interference on drivepipe local discharge detection due to a severe electromagnetic environment of transformer substation is overcome.
Description
Technical field
The present invention relates to charged detection technique field, particularly relate to a kind of sleeve pipe live testing apparatus for local discharge based on directional antenna array.
Background technology
The electrical bushing of 110kV and above is the main power equipment in transformer station, once there is insulation fault, often causes even regional area power failure of transformer station, brings huge negative effect to national economy and social stability.Shelf depreciation is the sign and major incentive in early stage of these device interior insulation faults, finds in time partial discharge phenomenon, determines that electric discharge position and eliminating cause that the insulation defect of shelf depreciation is the effective measures of avoiding device interior insulation fault.Raising power supply reliability being required along with economy, social development and the development of Condition-Based Maintenance Technology, the band electro-detection of the inner partial discharges fault of power equipment and locate imperative.
The charged detection method of existing shelf depreciation has: wideband current method, supercritical ultrasonics technology, superfrequency method etc.These methods are mainly used in Partial Discharge Detection and the location of transformer, GIS device interior at present.Existing method poor effect during for the fault detection of local discharge of inside pipe casing, major embodiment in the following areas: (1) cannot sensor installation, safe reliability is low.These power equipment installation positions set high, and Distance High Voltage Electricity Transfer is near, and in test job, the safety of the person and equipment does not ensure.(2) electromagnetic interference (EMI) is strong.Because electromagnetic environment in transformer station is very severe, these methods of giving have caused strong interference, cause extracting local discharge signal.
Summary of the invention
Based on above-mentioned situation, the present invention proposes a kind of sleeve pipe live testing apparatus for local discharge based on directional antenna array, realize the band electro-detection of the partial discharges fault of inside pipe casing.
To achieve these goals, technical scheme of the present invention is:
A sleeve pipe live testing apparatus for local discharge based on directional antenna array, comprising:
Directional antenna array, the electromagnetic wave signal giving off for detection of shelf depreciation, converts thereof into voltage signal output;
Signal conditioner, for receiving the voltage signal of directional antenna array output, eliminates the Electromagnetic Interference signal receiving, and amplifies described voltage signal, improves signal to noise ratio (S/N ratio);
High-speed signal acquisition device, for carrying out analog to digital conversion by the signal of signal conditioner output, realize collection, storage and the demonstration of digital signal.
Compared with prior art, beneficial effect of the present invention is: the present invention is based on the sleeve pipe live testing apparatus for local discharge of directional antenna array, first by directional antenna array, detect the electromagnetic wave signal that shelf depreciation gives off, convert thereof into voltage signal output; Signal conditioner receives the voltage signal of directional antenna array output, eliminates the Electromagnetic Interference signal receiving, and amplification voltage signal improves signal to noise ratio (S/N ratio); By high-speed signal acquisition device, the signal of signal conditioner output is carried out to analog to digital conversion again, realize collection, storage and the demonstration of digital signal.The present invention will detect antenna arrangement in the safety zone, ground with tested sleeve pipe apart from each other, and safe reliability is high, has solved the installation of sensors problem existing in prior art simultaneously; Adopt directional antenna array to detect sleeve pipe local discharge signal, binding signal conditioner, improved the receiving gain to tested sleeve pipe local discharge signal, reduce the sleeve pipe receiving gain of electromagnetic interference (EMI) around simultaneously, overcome the strong interference of the severe electromagnetic environment of transformer station to sleeve pipe Partial Discharge Detection.
Accompanying drawing explanation
Fig. 1 is the sleeve pipe live testing apparatus for local discharge structural representation based on directional antenna array in an embodiment;
Fig. 2 is the structural representation of directional antenna in an embodiment;
Fig. 3 is that in an embodiment, data processing and locating device obtain the schematic diagram that local discharge signal arrives the directional antenna array time;
Fig. 4 is that in an embodiment, data processing and locating device obtain the method flow schematic diagram of local discharge signal source position.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that embodiment described herein, only in order to explain the present invention, does not limit protection scope of the present invention.
Sleeve pipe live testing apparatus for local discharge based on directional antenna array in an embodiment, as shown in Figure 1, comprising:
Directional antenna array, the electromagnetic wave signal giving off for detection of shelf depreciation, converts thereof into voltage signal output;
Signal conditioner, for receiving the voltage signal of directional antenna array output, eliminates the Electromagnetic Interference signal receiving, and amplifies described voltage signal, improves signal to noise ratio (S/N ratio);
High-speed signal acquisition device, for carrying out analog to digital conversion by the signal of signal conditioner output, realize collection, storage and the demonstration of digital signal.
Known from the above description, the present invention is arranged in safety zone, ground by directional antenna array; Adopt directional antenna array to detect sleeve pipe local discharge signal, overcome sleeve pipe strong electromagnetic interference (EMI) around, by the further filtering interference signals of signal conditioner and amplification local discharge signal.
As an embodiment preferably, sleeve pipe live testing apparatus for local discharge based on directional antenna array also comprises data processing and locating device, for analyzing the digital signal that high-speed signal acquisition device is converted to, by reading the catastrophe point of described digital signal amplitude, obtain the time that local discharge signal arrives directional antenna array, calculate the mistiming that arrives each antenna, by solving mistiming system of equations, obtain local discharge signal source position.
As an embodiment preferably, described directional antenna array is comprised of 4 directional antennas and antenna holder, 4 directional antenna arrangement in one plane, form a plane quadrilateral, the perpendicular bisector of described plane quadrilateral points to tested sleeve pipe, described antenna holder supports, regulates described plane quadrilateral, and as shown in Figure 2,4 directional antennas are respectively S
1, S
2, S
3, S
4, by regulating the elevation angle and the position angle of antenna holder, make the normal of directional antenna array place plane point to certain position of tested sleeve pipe.
As an embodiment preferably, described signal conditioner is comprised of Hi-pass filter, power amplifier; The lower-cut-off frequency of described Hi-pass filter is not less than 0.3GHz, and stop band gain, higher than-40dB, according to the signal characteristic setting of sleeve pipe shelf depreciation, is not effectively avoided the undesired signal of other frequency band; The lower-cut-off frequency of described power amplifier is not less than 0.3GHz, and upper cut-off frequency is not less than 0.8GHz, and gain is not less than 20dB, effectively amplifies by the local discharge signal of Hi-pass filter.
As an embodiment preferably, the analog bandwidth of described high-speed signal acquisition device is not less than 0-2GHz, and port number is 4, and single pass sampling rate is not less than 20GS/s, waveform that can actual response sampled signal.
As an embodiment preferably, described data processing and locating device passing threshold method are obtained the time that local discharge signal arrives directional antenna array, and as shown in Figure 3, in figure, horizontal ordinate is the time, and unit is ns, and ordinate is voltage magnitude, and unit is mV; Threshold value (threshold) determines according to noise level, generally select noise amplitude 2 times; Be the moment corresponding to sampled point of the absolute value of signal amplitude while surpassing for the first time threshold value time of arrival.
As an embodiment preferably, as shown in Figure 4, data processing and locating device obtain local discharge signal source position, first data processing and locating device read the catastrophe point of the digital signal amplitude that high-speed signal acquisition device is converted to, obtain the time of local discharge signal arrival directional antenna array, calculate to arrive the mistiming of each antenna, time of arrival t
i(i=1,2,3,4, unit: be ns) absolute value of the signal amplitude moment corresponding to sampled point while surpassing for the first time threshold value, its read method as shown in Figure 3; Determine antenna coordinate S
i(x
i, y
i, z
i) (unit: m) need before to set up three-dimensional coordinate system, simple for the purpose of, take aerial array center as true origin O(0,0,0), the aerial array place plane of take is XOY plane, the direction of take this plane normal direction and pointing to sleeve pipe is Z axis; Propagation velocity of electromagnetic wave is light velocity c(=0.3m/ns); Solve mistiming system of equations and obtain local discharge signal source position;
Mistiming system of equations is as follows:
Wherein: P(x, y, z) be shelf depreciation coordinate to be asked, S
i(x
i, y
i, z
i) be known antenna coordinate, unit is: m; T is the travel-time that signal arrives the 1st antenna.τ
i1for signal arrives time poor of i antenna and the 1st antenna, have: τ
i1=t
i-T.
As an embodiment preferably, the lower-cut-off frequency of described Hi-pass filter is 1GHz, and stop band gain is-40dB, and the undesired signals such as corona that adopt the Hi-pass filter of this frequency band to exist in can filtering transformer station, improve the mistiming and read precision.
As an embodiment preferably, the lower-cut-off frequency of described power amplifier is 1GHz, and upper cut-off frequency is 2GHz, gains as 20dB, amplifies the voltage signal receiving, and improves signal to noise ratio (S/N ratio).
As an embodiment preferably, the analog bandwidth of described high-speed signal acquisition device is 2.5GHz, and port number is 4, and single pass sampling rate is 40GS/s, realizes the analog to digital conversion of signal, the collection of digital signal, storage and demonstration.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. the sleeve pipe live testing apparatus for local discharge based on directional antenna array, is characterized in that, comprising:
Directional antenna array, the electromagnetic wave signal giving off for detection of shelf depreciation, converts thereof into voltage signal output;
Signal conditioner, for receiving the voltage signal of directional antenna array output, eliminates the Electromagnetic Interference signal receiving, and amplifies described voltage signal, improves signal to noise ratio (S/N ratio);
High-speed signal acquisition device, for carrying out analog to digital conversion by the signal of signal conditioner output, realize collection, storage and the demonstration of digital signal.
2. the sleeve pipe live testing apparatus for local discharge based on directional antenna array according to claim 1, it is characterized in that, also comprise data processing and locating device, for analyzing the digital signal that high-speed signal acquisition device is converted to, by reading the catastrophe point of described digital signal amplitude, obtain the time that local discharge signal arrives directional antenna array, calculate the mistiming that arrives each antenna, by solving mistiming system of equations, obtain local discharge signal source position.
3. the sleeve pipe live testing apparatus for local discharge based on directional antenna array according to claim 1, it is characterized in that, described directional antenna array is comprised of 4 directional antennas and antenna holder, 4 directional antenna arrangement in one plane, form a plane quadrilateral, the perpendicular bisector of described plane quadrilateral points to tested sleeve pipe, and described antenna holder supports, regulates described plane quadrilateral.
4. the sleeve pipe live testing apparatus for local discharge based on directional antenna array according to claim 1, is characterized in that, described signal conditioner is comprised of Hi-pass filter, power amplifier; The lower-cut-off frequency of described Hi-pass filter is not less than 0.3GHz, and stop band gain is not higher than-40dB; The lower-cut-off frequency of described power amplifier is not less than 0.3GHz, and upper cut-off frequency is not less than 0.8GHz, and gain is not less than 20dB.
5. the sleeve pipe live testing apparatus for local discharge based on directional antenna array according to claim 1, is characterized in that, the analog bandwidth of described high-speed signal acquisition device is not less than 0-2GHz, and port number is 4, and single pass sampling rate is not less than 20GS/s.
6. the sleeve pipe live testing apparatus for local discharge based on directional antenna array according to claim 2, is characterized in that, described data processing and locating device passing threshold method are obtained the time that local discharge signal arrives directional antenna array.
7. the sleeve pipe live testing apparatus for local discharge based on directional antenna array according to claim 4, is characterized in that, the lower-cut-off frequency of described Hi-pass filter is 1GHz, and stop band gain is-40dB.
8. the sleeve pipe live testing apparatus for local discharge based on directional antenna array according to claim 4, is characterized in that, the lower-cut-off frequency of described power amplifier is 1GHz, and upper cut-off frequency is 2GHz, gains as 20dB.
9. the sleeve pipe live testing apparatus for local discharge based on directional antenna array according to claim 5, is characterized in that, the analog bandwidth of described high-speed signal acquisition device is 2.5GHz, and port number is 4, and single pass sampling rate is 40GS/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310700671.4A CN103698673A (en) | 2013-12-17 | 2013-12-17 | Drivepipe local discharge electrified detection device based on directional antenna array |
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| CN201310700671.4A CN103698673A (en) | 2013-12-17 | 2013-12-17 | Drivepipe local discharge electrified detection device based on directional antenna array |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914371A (en) * | 2015-07-08 | 2015-09-16 | 国家电网公司 | Virtual-connection discharging simulation apparatus of open type end screen binding post of oil-impregnated paper condenser type bushing and using method thereof |
| CN105548776A (en) * | 2016-01-27 | 2016-05-04 | 云南电网有限责任公司电力科学研究院 | System and method for radio frequency detection and antenna detection for electric power |
| CN108362983A (en) * | 2018-02-08 | 2018-08-03 | 华北电力大学 | Substation areas of transformer station shelf depreciation space intelligent positioning device and method |
| CN110154001A (en) * | 2019-06-17 | 2019-08-23 | 清华大学 | Positioning robot |
| CN113848434A (en) * | 2021-08-12 | 2021-12-28 | 广西电网有限责任公司电力科学研究院 | Interference source measuring method and system for on-site partial discharge |
| CN115993511A (en) * | 2023-03-22 | 2023-04-21 | 武汉纺织大学 | Partial discharge type high-precision detection and identification device, method and equipment |
-
2013
- 2013-12-17 CN CN201310700671.4A patent/CN103698673A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914371A (en) * | 2015-07-08 | 2015-09-16 | 国家电网公司 | Virtual-connection discharging simulation apparatus of open type end screen binding post of oil-impregnated paper condenser type bushing and using method thereof |
| CN105548776A (en) * | 2016-01-27 | 2016-05-04 | 云南电网有限责任公司电力科学研究院 | System and method for radio frequency detection and antenna detection for electric power |
| CN108362983A (en) * | 2018-02-08 | 2018-08-03 | 华北电力大学 | Substation areas of transformer station shelf depreciation space intelligent positioning device and method |
| CN108362983B (en) * | 2018-02-08 | 2020-05-26 | 华北电力大学 | Intelligent positioning device and method for substation area partial discharge space of transformer substation |
| CN110154001A (en) * | 2019-06-17 | 2019-08-23 | 清华大学 | Positioning robot |
| CN113848434A (en) * | 2021-08-12 | 2021-12-28 | 广西电网有限责任公司电力科学研究院 | Interference source measuring method and system for on-site partial discharge |
| CN115993511A (en) * | 2023-03-22 | 2023-04-21 | 武汉纺织大学 | Partial discharge type high-precision detection and identification device, method and equipment |
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Application publication date: 20140402 |