CN104166077A - High-frequency unipolarity noninductive pulse discharge signal detecting method - Google Patents
High-frequency unipolarity noninductive pulse discharge signal detecting method Download PDFInfo
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- CN104166077A CN104166077A CN201410395156.4A CN201410395156A CN104166077A CN 104166077 A CN104166077 A CN 104166077A CN 201410395156 A CN201410395156 A CN 201410395156A CN 104166077 A CN104166077 A CN 104166077A
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Abstract
The invention relates to a high-frequency unipolarity noninductive pulse discharge signal detecting method. The high-frequency unipolarity noninductive pulse discharge signal detecting method comprises the steps that needle plate electrodes are charged with surge voltage, and a voltage divider is used for collecting surge voltage signals; a current detecting unit collects current signals on the needle plate electrodes in a set sampling period; a photomultiplier observes optical signals produced during interval streamer discharge among the needle plate electrodes; the voltage divider, the current detecting unit and the photomultiplier transmit the detected signals to an oscilloscope. Compared with the prior art, the high-frequency unipolarity noninductive pulse discharge signal detecting method has the advantages of being high in precision, high in reliability and the like.
Description
Technical field
The present invention relates to discharge signal detection technique, especially relate to the noninductive pulsed discharge signal detecting method of a kind of high frequency single-polarity.
Background technology
In electric system, gas is a kind of insulating material quite widely applied to obtain.If the incision position of overhead transmission line, bus, disconnector etc. is all to rely on air as insulation completely.Although also some not exclusively relies on air as insulation, air is enclosed in their outside, forms a part for insulation.SF
6gas is from being found so far the only history of more than 100 years, and it has promoted rapidly sending out of T & D Technology and High-Voltage Insulation technology as the widespread use of high voltage insulating materials.Along with people improve constantly the understanding of discharge process, its research is also constantly had to new discovery.
Since electronics in 1858, be found, research for gas discharge did not just stop, the great successes that large quantity research is obtained have not only been established the theoretical foundation of gas discharge subject, and have summed up experimental technique and a large amount of valuable experimental data of comparative maturity.But, because gas discharge problem itself is exactly a wide research field, wherein can run into each structural level (comprising molecule, atom, photon and electronics) of material, influence factor is very many, so so far, experimental study and theory study for gas discharge phenomenon still do not have a set of complete and ripe system, also in developing stage.The various influence factors of further investigation process gas discharge, the discharge mechanism in search gas gap, for exploring new insulation technology, find new insulating material, improve existing insulator arrangement, preventing that various insulation faults have practical significance.
Within 1672, William has found the electric spark of artificial generation on rotation sulphur, and many scientists produce great interest to this mysterious phenomenon, and is devoted to untie the secret that " gas discharge " phenomenon produces.
1903, the classical inferior impact ionization theory of soup was suggested, and this is that gas discharge phenomenon is explained from microcosmic angle first, and its thought has been opened up a slice frontier of gas discharge research, and research work now is still had to important directive significance.
1940, Raether proposed that streamer is theoretical, it is to the succession of the inferior theory of soup and in-depth, it supplemented the inferior electric discharge of soup theoretical can not be applicable situation.It has considered the photoionization phenomenon in electric discharge, has affirmed that space charge is for the vital role of accelerating streamer development.When the electronics of electron avalanche head, afterbody and negative ion concentrations reach very high, can produce strong distortion effect to electric field around, accelerate the formation and development of ionization and streamer, finally cause puncturing of gas gap.The proposition of the inferior theory of soup and streamer theory makes gas discharge subject finally form a set of uniqueness and ripe theoretical system, for later research work lays a solid foundation.Theoretical based on streamer, Raether and Meek have carried out Modeling Calculation to the space charge field in discharge process respectively, and have obtained the initial criterion of streamer.
Streamer, as an important starting stage in this discharge process, is all a study hotspot academicly all the time.By the research to streamer, disclose the microscopic particle situation of change in ebb-flow discharge process in the early stage developing stage of gas discharge, the voltage breakdown that improves gas gap for suppressing the development of gas discharge has certain theory directive significance.
Mainly theoretical based on the inferior theory of soup and streamer to the understanding of corona discharge mechanism at present, and the inferior theory of soup mainly for be under infrabar, and the electric discharge phenomena that are not suitable under atmospheric pressure are explained, the under atmospheric pressure understanding of corona discharge mechanism is mainly theoretical based on streamer, therefore further investigation ebb-flow discharge has important theory significance to disclosing the corona discharge mechanism of transmission line of electricity.The research work of streamer is also the concern that enjoys scholars always, is also a Research Challenges, and main cause is that the state of ionization material that forms of ebb-flow discharge process is not away from thermodynamic equilibrium, sometimes even meet internal field's balance.It has been generally acknowledged that ebb-flow discharge is the nonlinear kinetics process of typical multiple dimensioned many couplings, further investigation ebb-flow discharge process has important physical significance to enrich with develop streamer theory.
Summary of the invention
Object of the present invention is exactly the pulsed discharge signal detecting method that provides in order to overcome the defect that above-mentioned prior art exists that a kind of accuracy is high, the high frequency single-polarity of good reliability is noninductive.
Object of the present invention can be achieved through the following technical solutions:
High frequency single-polarity is a noninductive pulsed discharge signal detecting method, comprising:
The surge voltage of annotating on needle plate electrode also utilizes voltage divider to gather the step of surge voltage signal;
Current detecting unit gathers the step of current signal on needle plate electrode to set the sampling period;
The step of gap ebb-flow discharge process light signal between photomultiplier observation needle plate electrode;
Voltage divider, current detecting unit, photomultiplier transfer to oscillographic step by the signal detecting;
Wherein, described current detecting unit comprises noninductive resistance and gas-discharge tube, described noninductive resistance one end connecting needle plate electrode, other end ground connection, described gas-discharge tube is in parallel with noninductive resistance, an output terminal after parallel connection is connected with described oscillograph by a resistance, and another output terminal is directly connected with oscillograph.
Described surge voltage is produced by surge generator, and filling is on needle plate electrode.
The resistance of described noninductive resistance is 50 Ω.
Described noninductive resistance is formed in parallel by a plurality of resistance.
Described noninductive resistance is connected with ripple device by coaxial cable for high frequency.
Compared with prior art, the present invention has the following advantages:
(1) detection method of the present invention detects surge voltage, current signal and discharge process light signal simultaneously, can effectively to the noninductive pulsed discharge signal of high frequency single-polarity, detect, and accuracy rate is high;
(2) noninductive resistance in current detecting unit has good through-current capability and fidelity, and change streamer into main discharge, during large electric current current flowing detecting unit, the instantaneous overvoltage moment producing enters ground connection by gas-discharge tube, in order to avoid surveying instrument and signal wire are subject to superpotential and damage;
(3) current detecting unit is simple in structure less, can place gas discharge pressure vessel inner, in order to avoid surveying instrument and signal wire are subject to the interference of the stray magnetic field of the generations such as dash current;
(4) current detecting unit is detachable, easy to use.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention;
Fig. 2 is the structural representation of current detecting unit in the present invention;
Fig. 3 is the flash-over characteristic oscillogram of SF6 gas under positive polarity surge voltage;
Fig. 4 is the flash-over characteristic oscillogram of SF6 gas under negative polarity surge voltage.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.The present embodiment be take technical solution of the present invention and is implemented as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
The subject matter that under the effect of surge voltage, gas pre-arcing testing current will solve with detecting unit, the one, the through-current capability of detecting unit, the 2nd, reduce the inductance of detecting unit as far as possible.The principle schematic that is illustrated in figure 1 the noninductive pulsed discharge signal detecting method of high frequency single-polarity of the present invention, comprises the following steps:
1) annotate on needle plate electrode surge voltage utilize voltage divider to gather surge voltage signal, surge voltage is produced by 400kV/20kJ surge generator.
2) current detecting unit gathers current signal on needle plate electrode to set the sampling period.
As shown in Figure 2, step 2) current detecting unit adopting in comprises noninductive resistance 4 and gas-discharge tube 3, noninductive resistance 4 one end connecting needle plate electrodes, other end ground connection, gas-discharge tube 3 is in parallel with noninductive resistance 4, and an output terminal after parallel connection is connected with oscillograph 5 by a resistance 6, and another output terminal is directly connected with oscillograph 5, during detection, it is inner that this current detecting unit is positioned over gas discharge pressure vessel.Current detecting unit can be converted into potential pulse by pre-arcing current impulse, and by oscillograph 5, it is detected, the current pulse signal producing for obtaining ebb-flow discharge.
Consider that pre-arcing pulse current size is for μ A～mA level, for making detection signal that distortion not occur, be beneficial to analysis and research, in current detecting unit, the resistance of noninductive resistance 4 is 50 Ω, can be formed in parallel by the resistance of 10 500 Ω.Electrode gap punctures and causes detecting the instantaneous overvoltage producing in impedance digital acquisition system is caused to damage when avoiding detecting pre-arcing current signal; at current detecting unit internal parallel 1 high capacity gas discharge tube circuit, protection digital collection system.When measuring current signal, pulse current detecting unit converts pre-arcing current impulse to potential pulse, by coaxial cable for high frequency, accesses digital high-speed sampling system, i.e. wideband high speed vast capacity digital storage oscilloscope.
Needle plate electrode comprises pin electrode 1 and plate electrode 2, and electrode surface all carries out good polishing.30 ° of pin electrode 1 point angles, radius-of-curvature is 0.5mm, and plate electrode 2 is Bruce electrode, and its thickness is 8mm, and diameter is 80mm, the adjustable extent of electrode gap d is 0～30mm.Pin electrode 1 and plate electrode 2 materials are stainless steel.
3) gap ebb-flow discharge process light signal between photomultiplier PMT observation needle plate electrode.
4) voltage divider, current detecting unit, photomultiplier transfer to oscillographic step by the signal detecting.Surge voltage, pre-arcing electric current, light signal record and show through digital storage oscilloscope, the waveform recording, as Figure 3-Figure 4.
Fig. 3 is that air pressure is while being 0.2MPa, the flash-over characteristic oscillogram of SF6 gas under positive polarity surge voltage, the pulse current detecting unit that can find out this development in figure transfers the process of streamer to after measuring accurately, reliably tens generation electron avalanches, and the current waveform that the light signal of observing by photomultiplier and pulse current pick-up unit are measured is in full accord.Fig. 4 is that air pressure is while being 0.2MPa, the flash-over characteristic oscillogram of SF6 gas under negative polarity surge voltage, the pulse current detecting unit that can find out too this development in figure transfers streamer to after measuring three generations's electron avalanche, and the current waveform that the light signal of observing by photomultiplier and pulse current detecting unit are measured is in full accord.The waveform that uses method provided by the invention can record exactly gas streamer pre-arcing electric current is described.
Claims (5)
1. the noninductive pulsed discharge signal detecting method of high frequency single-polarity, is characterized in that, comprising:
The surge voltage of annotating on needle plate electrode also utilizes voltage divider to gather the step of surge voltage signal;
Current detecting unit gathers the step of current signal on needle plate electrode to set the sampling period;
The step of gap ebb-flow discharge process light signal between photomultiplier observation needle plate electrode;
Voltage divider, current detecting unit, photomultiplier transfer to oscillographic step by the signal detecting;
Wherein, described current detecting unit comprises noninductive resistance and gas-discharge tube, described noninductive resistance one end connecting needle plate electrode, other end ground connection, described gas-discharge tube is in parallel with noninductive resistance, an output terminal after parallel connection is connected with described oscillograph by a resistance, and another output terminal is directly connected with oscillograph.
2. the noninductive pulsed discharge signal detecting method of a kind of high frequency single-polarity according to claim 1, is characterized in that, described surge voltage is produced by surge generator, and filling is on needle plate electrode.
3. the noninductive pulsed discharge signal detecting method of a kind of high frequency single-polarity according to claim 1, is characterized in that, the resistance of described noninductive resistance is 50 Ω.
4. the noninductive pulsed discharge signal detecting method of a kind of high frequency single-polarity according to claim 1, is characterized in that, described noninductive resistance is formed in parallel by a plurality of resistance.
5. the noninductive pulsed discharge signal detecting method of a kind of high frequency single-polarity according to claim 1, is characterized in that, described noninductive resistance is connected with ripple device by coaxial cable for high frequency.
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Cited By (5)
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| CN104734714A (en) * | 2015-03-18 | 2015-06-24 | 西北核技术研究所 | Signal conditioning method and signal conditioning system of unipolar fast pulse in radiation detection |
| CN105806787A (en) * | 2016-04-29 | 2016-07-27 | 南方电网科学研究院有限责任公司 | System and method for measuring long air gap lightning stroke discharge electron density |
| CN106443386A (en) * | 2016-10-20 | 2017-02-22 | 重庆大学 | Streamer discharge test system for insulating oil |
| CN108414902A (en) * | 2018-03-19 | 2018-08-17 | 北京理工大学 | A kind of method and device for detecting minim gap gas breakdown characteristic |
| CN113433373A (en) * | 2021-06-29 | 2021-09-24 | 西安交通大学 | Streamer charge quantity measuring device, system and method |
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| CN106443386A (en) * | 2016-10-20 | 2017-02-22 | 重庆大学 | Streamer discharge test system for insulating oil |
| CN108414902A (en) * | 2018-03-19 | 2018-08-17 | 北京理工大学 | A kind of method and device for detecting minim gap gas breakdown characteristic |
| CN113433373A (en) * | 2021-06-29 | 2021-09-24 | 西安交通大学 | Streamer charge quantity measuring device, system and method |
| CN113433373B (en) * | 2021-06-29 | 2022-10-14 | 西安交通大学 | Streamer charge quantity measuring device, system and method |
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