CN202929132U - Device for testing the response characteristics of metal oxide samples under steep front pulses - Google Patents
Device for testing the response characteristics of metal oxide samples under steep front pulses Download PDFInfo
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- CN202929132U CN202929132U CN 201220503561 CN201220503561U CN202929132U CN 202929132 U CN202929132 U CN 202929132U CN 201220503561 CN201220503561 CN 201220503561 CN 201220503561 U CN201220503561 U CN 201220503561U CN 202929132 U CN202929132 U CN 202929132U
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 14
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 14
- 230000004044 response Effects 0.000 title claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims abstract description 93
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
- 239000010949 copper Substances 0.000 claims abstract description 22
- 239000000523 sample Substances 0.000 claims description 12
- 238000002788 crimping Methods 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 13
- 238000005259 measurement Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 238000013456 study Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 241001404789 Smilax glabra Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model provides a device testing response characteristic of a metal oxide sample under steep-wave-front pulses. The device comprises a steep-wave-front pulse generating unit for generating steep-wave-front current waveform and a tester for testing current and voltage waveforms of the tested sample. The sample is connected into a loop formed by the steep-wave-front pulse generating unit, and two capacitors in the steep-wave-front pulse generating unit are charged by a dc power supply to breakdown a tri-electrode switch, thereby testing the response characteristic of the metal oxide sample under steep-wave-front pulses. The testing device employs a structure which integrates the capacitors with the switch, thereby reducing inductance of the loop; and a mechanism in which copper strips wrap the capacitors tightly is employed, so that inductance in the loop is decreased to the minimum; thus, enough current amplitude and steep rising waves are ensured, and residual voltage of a valve block under steep waves is obviously improved with the increase of steep-wave-front current.
Description
Technical field
The utility model belongs to the Hyper-Voltage of Power Systems field, is specifically related to a kind of metal oxide test product response characteristics testing device under steep pulse.
Background technology
Experimental study shows, Cubicle Gas-Insulated Switchgear (GIS) isolator operation can produce the very fast transient overvoltage that amplitude is high, steepness is large (VFTO), and the secondary device operation that the insulation of GIS and connection device thereof, shell are connected has material impact.At present, generally adopt the method for the GIS disconnector band damping resistance of Toshiba's proposition to suppress VFTO, obtained in practice using preferably, this scheme has all been adopted at station, Changzhi and the station, Nanyang of China's UHVAC demonstration project.Tsing-Hua University attempts installing the high frequency magnet ring and suppresses VFTO on GIS high pressure guide rod, carried out a large amount of laboratory studyes, still needs to verify by rig-site utilization the validity of this measure.In recent years, along with metal oxide arrester (hereinafter to be referred as lightning arrester) performance boost, its inhibiting effect to VFTO becomes the focus that research is paid close attention to gradually.
The lightning arrester of installing in electric system is mainly used in limiting thunder and lightning and switching overvoltage, because of the VFTO wave head time shorter, can reach several ns, more than oscillation frequency may reach 100MHz, arrester valve piece made response performance under high frequency is limited, and very few consideration limits VFTO with lightning arrester.Last century, the eighties rose, and in order to develop the lightning arrester of excellent performance, both at home and abroad the response characteristic of lightning arrester under steep shock wave was explored.BBC company has set up two exponential waves and square wave current source the metal oxide resistance (calling resistor disc in the following text) of different structure has been carried out experimental study, and the wave head time range of output current wave is 0.7～8 μ s.China Electric Power Research Institute has developed steep dash current wave apparatus, produced the current waveform of 0.1/0.2 μ s, 0.4/0.8 μ s, 0.8/3 μ s, 4/10 μ s, 8/20 μ s, 30/60 μ s, maximum current amplitude is 1kA, experimental study the impact on the lightning arrester response characteristic such as resistor disc structure and physical property.As seen, above-mentioned experimental study is subjected to the restriction of steep wave experiment power supply, exists the electric current wave head time to grow or the less problem of current amplitude, does not all obtain the volt-ampere characteristic of resistor disc under the VFTO steep wave.To set up the prerequisite of lightning arrester high frequency model because of resistor disc in the volt-ampere characteristic under steep wave, need badly obtain resistor disc in the wave head time less than the volt-ampere characteristic under the 100ns steep wave, and then the simulation study lightning arrester is to inhibiting effect and the scope of application of VFTO.
In existing measuring technology, generally produce pulse voltage by the Marx generator and put on the metal oxide test product, but this experimental loop is complicated, stray parameter is large, is difficult to produce very steep rise-time of current.
The utility model content
Measure in order to make up above-mentioned steep wave experiment power supply the deficiency that the volt-ampere characteristic of metal oxide test product under steep pulse exists, the purpose of this utility model is to propose a kind of metal oxide test product response characteristics testing device under steep pulse.
A kind of metal oxide test product response characteristics testing device under steep pulse, this device comprises:
Steep wave front current impulse generation device is connected with test product, for generation of the steep wave front current waveform; With
Testing tool is connected with test product, is used for measuring electric current, the voltage waveform of test product;
Described steep wave front current impulse generation device comprises the first capacitor, three electrode switch and second capacitor of series connection successively, be equipped with three terminals on described the first capacitor and the second capacitor, the second terminals of described the first capacitor and the second capacitor are connected to respectively the positive and negative electrode of DC high-voltage power supply, carry out integrated the connection by three electrode switch between the 3rd terminals of described the first capacitor and the second capacitor, the first terminals of described the first capacitor and the second capacitor are connected with test product two ends by copper strips respectively, consist of discharge loop.
Wherein, on the first terminals of described the second capacitor, screw rod is installed, the free time end of this screw rod is equipped with for the copper strips that connects test product with for the ground connection copper strips that makes discharge loop ground connection.
Wherein, described testing tool comprises the Luo-coil that is sheathed on screw rod, the high-voltage probe, shielded cable and the oscillograph that are connected with test product two ends; Described Luo-coil reaches oscillograph with the steep wave front current waveform of steep wave front current impulse generation device output through shielded cable; Under described steep wave front current waveform, described high-voltage probe is measured electric current, the voltage waveform of test product, and reaches oscillograph through shielded cable.
Wherein, the concrete structure of described integrated connection is:
Described three electrode switch comprise the dry gas tank that is filled with insulating gas and the positive and negative high-field electrode that is packaged in the trigger electrode in dry gas tank and is positioned at the trigger electrode both sides, one side of described positive and negative high-field electrode is respectively equipped with the long connecting screw rod of 0.5cm, be respectively equipped with the screw that is complementary with connecting screw rod on the 3rd terminals of described the first capacitor and the second capacitor, described connecting screw rod screws in screw and realizes that the first capacitor, the second capacitor are connected with the integrated of three electrode switch.
Wherein, the two ends of described test product are respectively equipped with crimp.
Wherein, described the first terminals low pressure end that is the first capacitor and the second capacitor; Described the second terminals and the 3rd terminals are equipotential, are the high-pressure side of the first capacitor and the second capacitor.
Wherein, the first terminals of described the first capacitor and the 3rd terminals lay respectively at the relative both sides of housing of the first capacitor, the second terminals of described the first capacitor positive pole that switches on power, it is located on the first capacitor casing of a side adjacent with the 3rd terminals; The first terminals of described the second capacitor and third high pressure side are positioned at the relative both sides of housing of the second capacitor, the second terminals of described the second capacitor negative pole that switches on power, and it is located on the second capacitor casing of a side adjacent with the 3rd terminals.
Wherein, the first terminals of described connection the first capacitor pad respectively with the surface of copper strips, the first capacitor and second capacitor of the copper strips of test product one end, the first terminals that are connected the second capacitor and the test product other end and are provided with insulation rubber, and above-mentioned two copper strips are wound in respectively the surface of the first capacitor and the second capacitor.
The utility model adopts technique scheme, and the advantage that has has:
Adopt the design of electric capacity and switch integrated coaxial configuration, steep wave front current impulse generation device does not almost have inductance, guarantees that the electric current wave head time that produces is shorter, satisfies the requirement of VFTO waveform;
The switch gap of steep wave front current impulse generation device can adopt the multiple gases insulating medium, gaseous tension is adjustable, and band external trigger breakdown mode, makes switch gap K voltage breakdown higher, the current peak that produces is large, wider range, can satisfy the measurement requirement of different performance resistor disc.
Description of drawings
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1 is the structural representation of steep wave front current impulse generation device in the utility model proving installation;
Fig. 2 is the circuit diagram of the utility model proving installation;
Fig. 3 is the voltage and current oscillogram of resistor disc QA22 under 10kA steep wave front electric current in embodiment 1;
Fig. 4 is the valve block volt-ampere characteristic comparison diagram of resistor disc QA22 under steep wave and lightning wave in embodiment 1;
Fig. 5 is the voltage and current oscillogram of resistor disc RB41 under 4kA steep wave front electric current in embodiment 2;
Fig. 6 is the valve block volt-ampere characteristic comparison diagram of resistor disc RB41 under steep wave and lightning wave in embodiment 2.
Embodiment
Below in conjunction with accompanying drawing and instantiation, further elaborate the utility model metal oxide test product response characteristics testing device under steep pulse, provide basic data for setting up the high frequency realistic model of lightning arrester under steep wave.Wherein same or analogous drawing reference numeral represents same or analogous device.
As Figure 1-3, this proving installation comprises steep wave front current impulse generation device and testing tool, wherein,
Steep wave front current impulse generation device comprises three electrode switch K and two capacitors (i.e. the first capacitor C1 and the second capacitor C2), two capacitor C1, C2 have respectively three terminals (i.e. the first terminals 1, the second terminals 2 and the 3rd terminals 3), the second terminals 2 and the 3rd terminals 3 are equipotential, are the high-pressure side of two capacitors; The first terminals 1 are independently, are the low pressure end of two capacitors.
Two capacitor C1, C2 can adopt film oil to mould the shell encapsulating structure, compare with the gas-insulated capacitor, and large 1 times of its volume ratio latter under same size, storage, transportation and use are looser to the requirement of environment.The second terminals of the first capacitor C1 are connected to the positive pole of power supply; the second terminals of the second capacitor C2 are connected to the negative pole of power supply; in order to improve the stable and reliability of this proving installation, the second terminals 2 of two capacitor C1, C2 can connect respectively the positive and negative electrode of DC high-voltage power supply by the protective resistor of 1M Ω.Two capacitor C1, C2 and three electrode switch K are mounted to compact integrated structure, can be placed in transformer oil, improve puncturing of switch gap K; Voltage three electrode switch K can adopt three electrode field distortion gas switchs, can adopt external trigger to puncture or self breakdown, the concrete structure of K switch comprises cylindrical stem pathogenic dryness tank and the positive and negative high-field electrode that is packaged in the trigger electrode in dry gas tank and is positioned at the trigger electrode both sides; One side of positive and negative high-field electrode is separately installed with the M10 connecting screw rod of a long 0.5cm, be respectively equipped with the M10 screw that is complementary with connecting screw rod on the 3rd terminals 3 of two capacitor C1, C2, connecting screw rod passes the through hole on dry gas tank and screws in and completes two capacitor C1, C2 in screw and be connected with three the integrated of electrode switch K, because connecting screw rod and screw directly screw, contact good and the connection that need not go between, the characteristics of miniaturization and compact have obtained maximum embodiment, can guarantee that loop inductance reaches minimum.Three electrode switch adopt dry gas tank as shell, have very high physical strength, can bear very high air pressure, thereby allow to reduce three electrode switch length, reduce switched inductors; Also be filled with insulating gas in dry gas tank, this insulating gas can adopt air, SF6 gas or other inert gas, and the gaseous tension scope can be regulated continuously at-0.1MPa～0.1MPa, and the insulating medium of selecting and gaseous tension depend on the current peak of measurement.
On the second capacitor C2, the M10 screw rod is installed also, one end of screw rod is screwed on the first terminals 1 of the second capacitor C2, its other end is connected with two copper strips, wherein article one is used for making discharge loop ground connection, second is connected on the crimp of metal oxide test product (being called for short a MOA test product) end, the crimp of the MOA test product other end is connected to by the 3rd copper strips on the first terminals 1 of the first capacitor C1, consists of discharge loop.The cabling principle of above-mentioned second and third copper strips is: guaranteeing that capacitor does not occur under the condition of edge flashing, copper strips is as far as possible short; The surface of copper strips and two capacitor C1, C2 is padded respectively and is provided with insulation rubber, and it is surperficial that copper strips is wrapped in two capacitor C1, C2, and try one's best, and can guarantee that whole loop is the compactest, and the electric current forward position is the most precipitous.Being positioned at test product two ends crimp is the oblate cylindricality that two red metal are made, and can guarantee that the stressed all even contacts of MOA test product are good, and facilitate the voltage measurement wiring.Above-mentioned copper strips can adopt short, wide copper bar well to connect, and reduces current oscillation.
The electric current and voltage testing tool comprises Luo-coil, high-voltage probe, oscillograph and some shielded cables, Luo-coil is sheathed near the screw rod the ground connection copper strips, and the steep wave front current waveform of steep wave front current impulse generation device output is transferred to oscillograph through shielded cable; Under the steep wave front current waveform, measure electric current, the voltage waveform of MOA test product by the high-voltage probe that is connected with the crimp at MOA test product two ends, and reach oscillograph through shielded cable, obtain the response characteristic of test product under the steep wave front current waveform according to electric current, voltage waveform.
The concrete operation method of this proving installation is as follows:
Access MOA test product in the loop that steep wave front current impulse generation device consists of is with two the capacitor Cs of direct supply U to steep wave front current impulse generation device
1, C
2Charging punctures three electrode switch K, producing the wave head rise time is that 50～100ns, peak value are the steep wave front current waveform of 500A～50kA, record electric current and voltage waveform on the MOA test product, reading the numerical value that in voltage waveform, the flat after peak value is corresponding is MOA test product residual voltage.Under the current waveform of identical amplitude, wave head rise time error is ± 5ns, repeat electric current and the residual voltage of 3 measurement MOA test products, each MOA test product measurement is no less than the residual voltage under 5 each and every one different current amplitudes, adopt the methods such as interpolation and match to carry out data to the measurement result of MOA test product volt-ampere characteristic and process, ask for the average volt-ampere characteristic of MOA test product under the steep wave front current impulse.
The MOA test product that adopts in an embodiment of the present utility model is MOA resistor disc QA22, and this example is the volt-ampere characteristic of measuring resistance sheet QA22 under steep wave, two capacitor C of steep wave front current impulse generation device
1, C
2Capacitance be 40nF, select and fill SF
6Three electrode switch K of gas, clearance distance is 4mm approximately, and gaseous tension is-0.1MPa～0.1MPa that the charging voltage of direct supply U is 10kV～100kV.Steep wave front current impulse generation device is placed in air, and by the resistor disc QA22 that accesses in the loop shown in Figure 1, electric current and voltage waveform on resistor disc are seen Fig. 3, and electric current is attenuation oscillasion impulse, and the cycle is 336ns approximately, and the wave head rise time is 80ns.
By changing the charging voltage of direct supply U, the generation current scope is 610A～10kA, measured electric current and the residual voltage value of resistor disc QA22 under 10 different current amplitudes, to 3 averaged of each current amplitude duplicate measurements, the current peak and the residual voltage that measure on resistor disc QA22 are listed in table 1.
The electric current of table 1 resistor disc QA22 and residual voltage value
| Sequence number | Current peak (kA) | Resistor disc residual voltage (kV) |
| 1 | 0.61 | 8.2 |
| 2 | 0.98 | 8.7 |
| 3 | 2.2 | 8.9 |
| 4 | 3.18 | 9.16 |
| 5 | 4.8 | 9.35 |
| 6 | 5.64 | 9.6 |
| 7 | 6.04 | 9.84 |
| 8 | 7.8 | 10.3 |
| 9 | 8.56 | 10.5 |
| 10 | 10 | 10.6 |
Adopt the data processing methods such as interpolation and match to carry out data to the volt-ampere characteristic of resistor disc QA22 under steep wave and process, compare with its volt-ampere characteristic under 8/20 μ s standard lightning wave, see Fig. 4.As seen, average volt-ampere characteristic and its volt-ampere characteristic under standard lightning wave of this resistor disc under steep wave is substantially similar, increases with electric current, and the resistor disc residual voltage slightly upwarps, and the valve plate residual voltage under steep wave has improved more than 20%.
The MOA test product that adopts in another embodiment of the present utility model is MOA resistor disc RB41, and this example is for measuring the volt-ampere characteristic of MOA resistor disc RB41 under steep wave, two capacitor C of steep wave front current impulse generation device
1, C
2Capacitance be 40nF, select the three electrode switch K that fill air, clearance distance is 1mm approximately, gaseous tension is-0.1MPa～0.1MPa that the charging voltage of direct supply U is 10kV～50kV.Steep wave front current impulse generation device is placed in air, and by the resistor disc RB41 that accesses in the loop shown in Figure 1, electric current and voltage waveform on resistor disc are seen Fig. 5, and electric current is attenuation oscillasion impulse, and the cycle is 283ns approximately, and the wave head rise time is 60ns.
By changing the charging voltage of direct supply U, the generation current scope is 770A～5.55kA, measured electric current and the residual voltage value of resistor disc RB41 under 10 different current amplitudes, to 3 averaged of each current amplitude duplicate measurements, the current peak and the residual voltage that measure on resistor disc RB41 are listed in table 2.
Electric current and the residual voltage of table 2 resistor disc RB41
| Sequence number | Current peak (kA) | Resistor disc residual voltage (kV) |
| 1 | 0.77 | 14.17 |
| 2 | 0.82 | 14.47 |
| 3 | 1.33 | 15.5 |
| 4 | 2.15 | 15.5 |
| 5 | 2.61 | 16.03 |
| 6 | 3.48 | 16.27 |
| 7 | 4.06 | 16.37 |
| 8 | 4.22 | 16.57 |
| 9 | 5.34 | 16.68 |
| 10 | 5.55 | 16.83 |
Adopting the data processing methods such as interpolation and match to carry out data to the volt-ampere characteristic of resistor disc RB41 under steep wave processes, compare with the volt-ampere characteristic of this resistor disc under other waveform, as shown in Figure 6, compare valve plate residual voltage 15% left and right that raise with the residual voltage under lightning wave.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; in conjunction with above-described embodiment, the utility model is had been described in detail; those of ordinary skill in the field are to be understood that: those skilled in the art still can modify or be equal to replacement embodiment of the present utility model, but these modifications or change are all among the claim protection domain that application is awaited the reply.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014048340A1 (en) * | 2012-09-27 | 2014-04-03 | 国家电网公司 | Device for testing response characteristic of metal oxide sample under steep-front pulse |
| CN103743968A (en) * | 2013-12-17 | 2014-04-23 | 上海交通大学 | Multiple lightning current tolerance test method for metal oxide lightning arrester |
| CN104459235A (en) * | 2014-12-09 | 2015-03-25 | 国家电网公司 | Compact closed gas insulation impulse voltage generation device |
-
2012
- 2012-09-27 CN CN 201220503561 patent/CN202929132U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014048340A1 (en) * | 2012-09-27 | 2014-04-03 | 国家电网公司 | Device for testing response characteristic of metal oxide sample under steep-front pulse |
| CN103743968A (en) * | 2013-12-17 | 2014-04-23 | 上海交通大学 | Multiple lightning current tolerance test method for metal oxide lightning arrester |
| CN103743968B (en) * | 2013-12-17 | 2016-07-06 | 上海交通大学 | Multiple lightning current tolerance test method for metal oxide lightning arrester |
| CN104459235A (en) * | 2014-12-09 | 2015-03-25 | 国家电网公司 | Compact closed gas insulation impulse voltage generation device |
| CN104459235B (en) * | 2014-12-09 | 2017-05-24 | 国家电网公司 | Compact closed gas insulation impulse voltage generation device |
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