CN104166043A - Non-inductive pulse current detection device - Google Patents
Non-inductive pulse current detection device Download PDFInfo
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- CN104166043A CN104166043A CN201410394701.8A CN201410394701A CN104166043A CN 104166043 A CN104166043 A CN 104166043A CN 201410394701 A CN201410394701 A CN 201410394701A CN 104166043 A CN104166043 A CN 104166043A
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Abstract
The invention relates to a non-inductive pulse current detection device which comprises a pin plate electrode and a current detection unit. The current detection unit comprises a non-inductive resistor, a gas discharge tube and an oscilloscope, one end of the non-inductive resistor is connected with the pin plate electrode, the other end of the non-inductive resistor is grounded, and the gas discharge tube is connected with the non-inductive resistor in parallel; after the gas discharge tube is connected with the non-inductive resistor in parallel, one output end is connected with the oscilloscope through a resistor, and the other output end is directly connected with the oscilloscope. During detection, the non-inductive pulse current detection device is placed in a gas discharge pressure container. Compared with the prior art, the non-inductive pulse current detection device has the advantages of being high in accuracy, good in reliability and the like.
Description
Technical field
The present invention relates to current detection technology, especially relate to a kind of noninductive pulse current pick-up unit.
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.
Therefore,, under different voltage waveforms, gas with various, experimental study ebb-flow discharge characteristic, has developed streamer current sensing means.
Summary of the invention
Object of the present invention is exactly in order to overcome the defect that above-mentioned prior art exists, to provide that a kind of accuracy is high, the noninductive pulse current pick-up unit of good reliability.
Object of the present invention can be achieved through the following technical solutions:
A kind of noninductive pulse current pick-up unit, comprise needle plate electrode and current detecting unit, described current detecting unit comprises noninductive resistance, gas-discharge tube and oscillograph, 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 oscillograph by a resistance, another output terminal is directly connected with oscillograph, and during detection, it is inner that this device is positioned over gas discharge pressure vessel.
The resistance of described noninductive resistance is 50 Ω.
Described noninductive resistance is formed in parallel by a plurality of resistance.
Described needle plate electrode comprises pin electrode and plate electrode, and pin electrode, perpendicular to plate electrode, is provided with gap between pin electrode and plate electrode.
The point angle of described pin electrode is 30 °, and radius-of-curvature is 0.5mm.
The thickness of described plate electrode is 8mm, and diameter is 80mm.
Described pin electrode and the gap between plate electrode are 0～30mm.
Described pin electrode and plate electrode are all for being made by stainless steel material and the surperficial electrode through polishing.
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) needle plate electrode model easily forms severe non-uniform electric field, easily produces more stable electron avalanche and streamer and is converted into main discharge again;
(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) pulse 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 structural representation of the present invention;
Fig. 2 is scheme of installation of 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.As shown in Figure 1, noninductive pulse current pick-up unit of the present invention, comprise needle plate electrode and current detecting unit, current detecting unit comprises noninductive resistance 4, gas-discharge tube 3 and oscillograph 5, 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 device 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.
In order to test the performance of the above-mentioned sense pulse current pick-up unit of development, set up relevant insulating gas ebb-flow discharge experimental study platform.For avoiding interference and the regulation and control air pressure of external electric field, manufacture experimently the pressure vessel that hyperbar is 0.6MPa, on needle plate electrode gap, carry out gas discharge test, the Performance And Reliability of test pre-arcing current detecting unit.The installation site of pulse current detecting unit, as shown in Figure 2.
Be convenient to measure discharge data and observation discharge signal, trial voltage is produced by 400kV/20kJ surge generator, the lightning wave producing is in the error range of GB/T16927.1 and IEC60060.1 standard regulation, and wavefront time/wave rear time of the lightning impulse voltage ripple that test adopts is 1.2/50us.Because the development of streamer process is quick, High Voltage Impulse Waveform and the judgement streamer evolution of pre-arcing current waveform and speed of development are therefore measured in more difficult direct observation simultaneously.Utilize voltage divider to measure surge voltage, with the pulse current pick-up unit of development, survey pre-arcing electric current.For the performance of check pulse current detecting unit, adopt the light signal of photomultiplier (PMT) observation gap ebb-flow discharge process simultaneously.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.Illustrate that this pulse current detecting unit can record the waveform of gas streamer pre-arcing electric current exactly.
Claims (9)
1. a noninductive pulse current pick-up unit, it is characterized in that, comprise needle plate electrode and current detecting unit, described current detecting unit comprises noninductive resistance (4), gas-discharge tube (3) and oscillograph (5), described noninductive resistance (4) one end connecting needle plate electrode, other end ground connection, described gas-discharge tube (3) is in parallel with noninductive resistance (4), an output terminal after parallel connection is connected with oscillograph (5) by a resistance (6), another output terminal is directly connected with oscillograph (5), during detection, it is inner that this device is positioned over gas discharge pressure vessel.
2. a kind of noninductive pulse current pick-up unit according to claim 1, is characterized in that, the resistance of described noninductive resistance (4) is 50 Ω.
3. a kind of noninductive pulse current pick-up unit according to claim 1, is characterized in that, described noninductive resistance (4) is formed in parallel by a plurality of resistance.
4. a kind of noninductive pulse current pick-up unit according to claim 1, it is characterized in that, described needle plate electrode comprises pin electrode (1) and plate electrode (2), pin electrode (1), perpendicular to plate electrode (2), is provided with gap between pin electrode (1) and plate electrode (2).
5. a kind of noninductive pulse current pick-up unit according to claim 4, is characterized in that, the point angle of described pin electrode (1) is 30 °, and radius-of-curvature is 0.5mm.
6. a kind of noninductive pulse current pick-up unit according to claim 4, is characterized in that, the thickness of described plate electrode (2) is 8mm, and diameter is 80mm.
7. a kind of noninductive pulse current pick-up unit according to claim 4, is characterized in that, the gap between described pin electrode (1) and plate electrode (2) is 0～30mm.
8. a kind of noninductive pulse current pick-up unit according to claim 4, is characterized in that, described pin electrode (1) and plate electrode (2) are all for being made by stainless steel material and the surperficial electrode through polishing.
9. a kind of noninductive pulse current pick-up unit according to claim 1, is characterized in that, described noninductive resistance (4) is connected with ripple device (5) by coaxial cable for high frequency.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535868A (en) * | 2015-01-09 | 2015-04-22 | 中国人民解放军军械工程学院 | Electrostatic discharge test device under electromagnetic pulse radiation environment |
| CN106885936A (en) * | 2017-01-22 | 2017-06-23 | 华北电力大学 | The hardened structure discharge current measurement apparatus of rod based on insulation point domain combined method |
| CN107957536A (en) * | 2017-10-16 | 2018-04-24 | 许继电气股份有限公司 | Sychronisation and pilot system are tested in a kind of aperiodic triggering of direct-current transmission converter valve |
| CN108196106A (en) * | 2017-12-19 | 2018-06-22 | 合肥博雷电气有限公司 | A kind of big pulse current monitoring device |
| CN109738674A (en) * | 2019-01-30 | 2019-05-10 | 朱益飞 | Nanosecond pulse returned signal acquisition device |
-
2014
- 2014-08-12 CN CN201410394701.8A patent/CN104166043A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535868A (en) * | 2015-01-09 | 2015-04-22 | 中国人民解放军军械工程学院 | Electrostatic discharge test device under electromagnetic pulse radiation environment |
| CN106885936A (en) * | 2017-01-22 | 2017-06-23 | 华北电力大学 | The hardened structure discharge current measurement apparatus of rod based on insulation point domain combined method |
| CN106885936B (en) * | 2017-01-22 | 2019-10-01 | 华北电力大学 | Divide the hardened structure discharge current measuring device of stick-of domain combined method based on insulation |
| CN107957536A (en) * | 2017-10-16 | 2018-04-24 | 许继电气股份有限公司 | Sychronisation and pilot system are tested in a kind of aperiodic triggering of direct-current transmission converter valve |
| CN107957536B (en) * | 2017-10-16 | 2019-12-10 | 许继电气股份有限公司 | Non-periodic trigger test synchronization device and non-periodic trigger test system for direct-current transmission converter valve |
| CN108196106A (en) * | 2017-12-19 | 2018-06-22 | 合肥博雷电气有限公司 | A kind of big pulse current monitoring device |
| CN109738674A (en) * | 2019-01-30 | 2019-05-10 | 朱益飞 | Nanosecond pulse returned signal acquisition device |
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Application publication date: 20141126 |