CN101251563A - Composite apparatus local discharge on-line detecting device based on rectangle aperture antenna - Google Patents
Composite apparatus local discharge on-line detecting device based on rectangle aperture antenna Download PDFInfo
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- CN101251563A CN101251563A CNA2008100245272A CN200810024527A CN101251563A CN 101251563 A CN101251563 A CN 101251563A CN A2008100245272 A CNA2008100245272 A CN A2008100245272A CN 200810024527 A CN200810024527 A CN 200810024527A CN 101251563 A CN101251563 A CN 101251563A
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Abstract
A composite apparatus partial discharge online detecting device based on a rectangular aperture antenna comprises a rectangular aperture antenna (1), a high pass filter (2), a high frequency amplifier (3), data acquisition and transmission equipment (4) and a computer (5), wherein the rectangular aperture antenna (1) is connected with a signal input end of the high pass filter (2); a signal output end of the high pass filter (2) is connected with a signal input end of the high frequency amplifier (3); a plurality of signal output ends of the high frequency amplifier (3) are respectively connected with the data acquisition and transmission equipment (4); athea signal output end of the data acquisition and transmission equipment (4) is connected with the computer (5); therefore, when equipment operates, early partial discharge occurring inside GIS can be found.
Description
Technical field
The present invention is a kind of on-line measuring device that is applied to gas insulated combined electrical equipment (GIS) shelf depreciation, belongs to the technical field that High-Voltage Insulation detects.
Background technology
It is little that gas insulated combined electrical equipment (GIS) has floor area, the operational reliability advantages of higher, but totally enclosed result makes the shelf depreciation of puberty in inside be difficult to hold, so it is particularly important that the on-line monitoring of shelf depreciation seems.Different with transformer inside shelf depreciation is, the inner shelf depreciation that takes place of GIS can be leaked with form of electromagnetic wave by the surface that connects the disc insulator between two pipelines, and the detection that this phenomenon makes us use outside and inside antenna to carry out shelf depreciation may become.The characteristics of inside antenna (sensor) are that antijamming capability is strong, the detection sensitivity height, and still, how installing concerning the GIS that is moving is a problem.External detection mainly detects the electromagnetic wave that leaks erecting a television antenna near the position of disc insulator, its shortcoming be antijamming capability relatively a little less than.
Summary of the invention
Technical matters: the purpose of this invention is to provide a kind of portable gas insulation in combined electric appliance online detector for partial discharge, under the situation of equipment operation, can find to occur in the inner early stage shelf depreciation of GIS based on the oblong openings antenna.
Technology is put case: online detector for partial discharge of gas-insulated substation of the present invention comprises oblong openings antenna, Hi-pass filter, radio-frequency amplifier, data acquisition and transmitting device, computing machine; Wherein the signal input part of oblong openings antenna and Hi-pass filter joins, the signal output part of Hi-pass filter connects the signal input part of radio-frequency amplifier, the signal output part of multichannel radio-frequency amplifier connects data acquisition and transmitting device respectively, and the signal output part of data acquisition and transmitting device connects computing machine.Sensor adopts the oblong openings antenna, and this antenna is the banded annular of opening, is provided with a strip groove on banded annular.
This pick-up unit can be found the latent fault that produces owing to shelf depreciation early, can provide early warning the important means of serious problem to occur to avoid electrical network in case of necessity, and it has following characteristics:
A. the oblong openings antenna of Cai Yonging has the bandwidth of 20MHz-1GHz, can detect the various types of discharges that occur in GIS inside.Because antenna is the mounted on surface that is close to insulation stent, so antijamming capability is between inside antenna (sensor) and the outside antenna that sets up.Compare simply economy with other sensor.
B. adopt the mode of Tyke digital filter and GPIB combination to carry out data acquisition and transmission manner.Under the condition that satisfy to detect fully, except on the price than simple employing data collecting card economy, on the volume and weight of device, also meet portable requirement more.
Beneficial effect: the target of this pick-up unit is exactly to find to occur in the early stage shelf depreciation of GIS inside under the situation of equipment operation.Device adopts portable design, and volume is little, in light weight, cheap, can move detection easily.The oblong openings antenna that adopts is compared with internal sensor and can be mounted and dismounted easily, no matter is for newly-built and can detecting easily of moving.Owing to adopted the installation method of being close to formula, the sensitivity of its detection is between internal sensor and other exterior antenna, cost has reduced A-frame than identical exterior antenna, its detection bandwidth can reach about 900MHz, can detect the various types of shelf depreciations that occur in combined electrical apparatus inside fully.Under laboratory conditions, can be easy to detect the discharge signal of 25pC.
Description of drawings
Fig. 1 is that the combined electrical apparatus partial-discharge detection system constitutes block diagram,
Fig. 2 is the structural representation of oblong openings antenna,
Fig. 3 is the waveform that the simulated failure discharge system is accepted,
Fig. 4 injects the waveform that the 25pC pulse system is accepted,
1 has among the above figure: oblong openings antenna 1, Hi-pass filter 2, radio-frequency amplifier 3, data acquisition and transmitting device 4, computing machine 5.
Embodiment
The design of this device is specific as follows:
(1) oblong openings antenna (sensor)
The oblong openings antenna is to open a long 2L (2L=λ/2) of being on conductive metal thin plate, wide groove for W forms, the width of groove width W and GIS disc insulator is suitable, and this antenna is on the basis of desirable slot antenna, designs with the method that practice combines through theoretical analysis.The housing of antenna is close to metal flange surface one circle (being easy to install and take off) is installed.When the electromagnetic wave of local discharge generation is propagated through conductor and container, between insulation gap, produce and leak, and the antenna that is fixed on insulation gap can effectively detect the resonance electric wave, thereby reach the purpose that detects shelf depreciation.The antenna of design can receive the wideband territory signal of 10MHz to 1GHz, is impartial situation at 20MHz basically to 900MHz wideband territory intermediate frequency spectrum, in not significantly decay of high band, and also intact to the response of signal, adhere to specification fully.
(2) Hi-pass filter
Designed and produced five rank Hi-pass filters of three kinds of cutoff frequencys, cutoff frequency is respectively: 50MHz, 100MHz, 150MHz, select to use according to the disturbed condition of the on-the-spot surrounding environment of tested GIS.In designing and producing the process of wave filter, the as close as possible nominal value of component value can be by the value that adjust the minor alteration element among a small circle of cutoff frequency in the time of suitable, some on market, buy less than inductance element can get by own coiling.
(3) radio-frequency amplifier
The MWA5157 dedicated antenna amplifier that radio-frequency amplifier adopts U.S. motorola inc to produce, its bandwidth is 30～890MHz, gains to be 24dB, and has that noise is low, imbalance is little and characteristics such as the range of linearity is big.
(4) data acquisition and transmission system
In view of the frequency very high (MHz rank) of the shelf depreciation that occurs in GIS inside, adopt data collecting card to be difficult to arrive predetermined requirement, so native system adopts the mode of Tyke digital filter and GPIB combination to carry out data acquisition and transmission.By the digital filter collection, wave file is handled after importing computing machine by the GPIB transmission behind aerial signal process wave filter, the amplifier.
(5) computing machine (system software)
System interface: system software is mainly demarcated the unit by system interface, data acquisition unit, signal processing unit and point of discharge and is formed total system employing VC6.0 programming.
The GIS on-line monitoring system has carried out related experiment on the simulated failure GIS of certain power test research institute experimental provision.Simulated failure GIS is made up of the bulge of long 2.5 meters of three joints, pressure 0.2Mpa in the pipe, the centre is provided with the one pole bus, being provided with a metal nuts as trouble spot (having formed a needle plate electrode between bolt and the metal pipe-wall), when rising to 50,000 volts, voltage can produce discharge signal near on the rightmost position of bus.This discharge signal receives by being placed in supravasal antenna 1-antenna 4.Signal is through amplification, filtering, and by the digital oscilloscope collection, wave file is uploaded to the computing machine deposit by GPIB and handles, and sample frequency is 5GHz, and acquisition length is 10KB, and pick-up unit is seen Fig. 1.
Fig. 3 is the received signal of simulated failure shelf depreciation (7.5 ten thousand volts of voltages).Trouble spot (position of screw) is 0.2m apart from first antenna, is respectively 2.3m, 4.8m, 7.3m apart from second and third four antenna.
Fig. 4 is the signal waveform of injected pulse electric current 25pC.The electric current injection experiments is that (Far Left of GIS pipeline) injects a string electric current with the form of pulse at the high-voltage power supply place, because the discharge capacity of the pulse current that is injected into is known, so can be used for judging that the sensitivity level that system's minimum under laboratory conditions can detected shelf depreciation is 25pC.
Claims (2)
1. the combined electrical apparatus partial-discharge on-line measuring device based on the oblong openings antenna is characterized in that this device comprises oblong openings antenna (1), Hi-pass filter (2), radio-frequency amplifier (3), data acquisition and transmitting device (4), computing machine (5); Wherein oblong openings antenna (1) joins with the signal input part of Hi-pass filter (2), the signal output part of Hi-pass filter (2) connects the signal input part of radio-frequency amplifier (3), the signal output part of multichannel radio-frequency amplifier (3) connects data acquisition and transmitting device (4) respectively, and the signal output part of data acquisition and transmitting device (4) connects computing machine (5).
2. the combined electrical apparatus partial-discharge on-line measuring device based on the oblong openings antenna according to claim 1, it is characterized in that sensor (1) adopts the oblong openings antenna, this antenna is the banded annular of opening, is provided with a strip groove (11) on banded annular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100245272A CN101251563A (en) | 2008-03-25 | 2008-03-25 | Composite apparatus local discharge on-line detecting device based on rectangle aperture antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100245272A CN101251563A (en) | 2008-03-25 | 2008-03-25 | Composite apparatus local discharge on-line detecting device based on rectangle aperture antenna |
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| CN101251563A true CN101251563A (en) | 2008-08-27 |
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| CNA2008100245272A Pending CN101251563A (en) | 2008-03-25 | 2008-03-25 | Composite apparatus local discharge on-line detecting device based on rectangle aperture antenna |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813743A (en) * | 2010-04-22 | 2010-08-25 | 山东泰开高压开关有限公司 | Method for detecting partial discharge in gas insulated switchgear and detecting and positioning device |
| CN101650407B (en) * | 2009-09-02 | 2011-04-13 | 江苏省电力公司常州供电公司 | Sulfur hexafluoride gas insulation totally-enclosed combined electric partial discharge detection and positioning system |
| CN101644738B (en) * | 2009-09-02 | 2011-06-08 | 江苏省电力公司常州供电公司 | Local discharge detecting system of sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus |
| CN102103181A (en) * | 2009-12-17 | 2011-06-22 | 上海莫克电子技术有限公司 | Geographic information system (GIS) on-line local discharge monitoring system |
| CN101726694B (en) * | 2008-10-13 | 2013-06-12 | 株式会社晓星 | Partial discharging detection apparatus for gas insulated equipment |
| CN103487728A (en) * | 2013-08-30 | 2014-01-01 | 广东电网公司电力科学研究院 | Narrow-band electromagnetic wave signal coupling method and detecting system for measuring GIS partial discharge |
-
2008
- 2008-03-25 CN CNA2008100245272A patent/CN101251563A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726694B (en) * | 2008-10-13 | 2013-06-12 | 株式会社晓星 | Partial discharging detection apparatus for gas insulated equipment |
| CN101650407B (en) * | 2009-09-02 | 2011-04-13 | 江苏省电力公司常州供电公司 | Sulfur hexafluoride gas insulation totally-enclosed combined electric partial discharge detection and positioning system |
| CN101644738B (en) * | 2009-09-02 | 2011-06-08 | 江苏省电力公司常州供电公司 | Local discharge detecting system of sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus |
| CN102103181A (en) * | 2009-12-17 | 2011-06-22 | 上海莫克电子技术有限公司 | Geographic information system (GIS) on-line local discharge monitoring system |
| CN101813743A (en) * | 2010-04-22 | 2010-08-25 | 山东泰开高压开关有限公司 | Method for detecting partial discharge in gas insulated switchgear and detecting and positioning device |
| CN101813743B (en) * | 2010-04-22 | 2012-11-21 | 山东泰开高压开关有限公司 | Method for detecting partial discharge in gas insulated switchgear and detecting and positioning device |
| CN103487728A (en) * | 2013-08-30 | 2014-01-01 | 广东电网公司电力科学研究院 | Narrow-band electromagnetic wave signal coupling method and detecting system for measuring GIS partial discharge |
| CN103487728B (en) * | 2013-08-30 | 2016-06-08 | 广东电网公司电力科学研究院 | Measure narrow-band electromagnetic wave signal coupling process and the detection system of GIS partial discharge |
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Open date: 20080827 |