CN201191311Y - Transient characteristic experiment apparatus of ultra-high-voltage current transducer - Google Patents
Transient characteristic experiment apparatus of ultra-high-voltage current transducer Download PDFInfo
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- CN201191311Y CN201191311Y CNU2008200671913U CN200820067191U CN201191311Y CN 201191311 Y CN201191311 Y CN 201191311Y CN U2008200671913 U CNU2008200671913 U CN U2008200671913U CN 200820067191 U CN200820067191 U CN 200820067191U CN 201191311 Y CN201191311 Y CN 201191311Y
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Abstract
The utility model relates to a transient behavior testing device of an extra-high voltage current transformator, which is composed of a transient current generating device, a transient current bus bar and a measuring control device, wherein the measuring control device is engaged with the transient current generating device, the transient current generating device comprises an alternating-current generating device and a pulse direct current generating device, the transient current bus bar comprises an alternating-current equal ampere-turns bus bar and a pulse direct current equal ampere-turns bus bar, the alternating-current equal ampere-turns bus bar and the pulse direct current equal ampere-turns bus bar are wound on a ring-shaped coil of the transient current transformator to form an alternating-current equal ampere-turns bus bar winding and a pulse direct current equal ampere-turns bus bar winding, the alternating-current equal ampere-turns bus bar winding is connected with the alternating-current generating device to form an alternating-current equal ampere-turns loop, the direct equal ampere-turns bus bar winding is connected with one or two pulse direct current generating devices to form a direct current equal ampere-turns loop through a switch, an electric reactor and an electrical resistor, the number of turns of the alternating-current equal ampere-turns bus bar winding and the pulse direct current equal ampere-turns bus bar winding is equal, and the alternating-current equal ampere-turns bus bar winding and the pulse direct current equal ampere-turns bus bar winding utilize the same decoupling impedance. The transient behavior testing device has the advantages of reducing the testing cost of the extra-high voltage current transformator, and reducing the electromagnetic pollution of testing current to the environment.
Description
Affiliated technical field
The utility model relates to the test unit of current transformer transient characterisitics, particularly special high-tension current inductor transient characteristics tester, and it belongs to the field category of extra-high voltage electric power equipment.
Background technology
Usually, the working voltage of extra-high voltage grid surpasses 1000kV, when electrical network has an accident, can produce the short-circuit current bigger than supergrid, for example reaches more than the 100kA.So just require to be installed in the in the past bigger fault current of current transformer energy response ratio that extra-high voltage grid is used to protect.According to the knowledge of the applicant, the test unit of existing current transformer transient characterisitics is not undergoing technological transformation or is taking under the condition of ancillary technique means, with regard to the technical level of existing test unit, it is very difficult that such current transformer is carried out the transient characterisitics test.Though present dynamic and thermal stability test unit can provide this other alternating current of level, can not satisfy closing-minute and close-minute-close-time constant of minute circulation requirement.This is that loop resistance is little because during the alternate or relative ground circuit of electrical network, and power factor is low, and time constant generally surpasses 100ms, for example reaches 120ms; On the other hand, because the electric current of dynamic and thermal stability test loop produces by the transformer conversion, and the resistance of Transformer Winding is to be serially connected in the loop, thereby loop resistance is significantly increased, and is directed at the power factor height, and time constant is difficult to surpass 50ms.Up to the present, the transient characterisitics test unit of great current mutual inductor has only and uses surge generator or directly grid short circuit.Because the extra-high voltage current transformer requires that bigger transient state test current is arranged, so two kinds of test units of this that has only carry out could using behind the capacity upgrade, this is an engineering that investment is huge, and general condition is difficult to realize down.
The utility model content
The purpose of this utility model is, the problem that is difficult to carry out the special high-tension current inductor transient characteristics test at existing testing equipment is carried out technological improvement, propose and the design special high-tension current inductor transient characteristics tester, so, just can be implemented in the needs that satisfy the special high-tension current inductor transient characteristics test under the less input situation.
Technical solution of the present utility model is, by the transient current generating means, transient current bus and measuring and controlling are formed, it is characterized in that, measuring and controlling cooperates with the transient current generating means, the transient current generating means comprises alternating current generating means and pulse direct current generating means, the transient current bus comprises that interchange waits ampere-turn buses such as ampere-turn bus and pulse direct current, they are on the toroid winding of transient current transformer, constitute interchange and wait ampere-turn bus windings such as ampere-turn bus winding and pulse direct current, interchange waits ampere-turn bus winding to be connected and to form ampere-turn loops such as interchange with the alternating current generating means, ampere-turn bus windings such as direct current are through switch, reactor is connected and forms ampere-turn loops such as direct current with the pulse direct current generating means with resistor, the sequential of discharge is operated by measuring and controlling.
It is characterized in that ampere-turn bus windings such as direct current are connected and form ampere-turn loops such as direct current through switch, reactor and resistor with one or two pulse direct current generating meanss.
It is characterized in that interchange waits the equal turn numbers of ampere-turn bus windings such as ampere-turn bus winding and pulse direct current, and uses common decoupling impedance.
The utility model uses alternating current generating means and pulse direct current generating means and forms the transient current generating means by ampere-turn bus windings such as ampere-turn bus winding and pulse direct current such as exchanging, the utility model adopts the transient current bus to be wound with ampere-turn bus windings such as ampere-turn bus winding such as interchange and pulse direct current respectively by the even distribution mode of circumference on the toroid winding of transient current transformer, the equal turn numbers of two windings, two windings use common decoupling impedance, interchange waits ampere-turn bus winding to be connected and to form ampere-turn loops such as interchange through switch with a high capacity step-down transformer output terminal, and ampere-turn bus windings such as direct current are through switch, reactor and resistor are filled with high-tension capacitor and are connected and form ampere-turn loops such as direct current with one or two.The sequential of discharge is operated by measuring and controlling, and two loops can obtain the transient state test current of needs on the annular core of tested transient current transformer when uniting discharge.
Principle of work of the present utility model is, the extra-high voltage transient current transformer is a bus type current transformer, the ampere-turn bus such as can use to carry out equivalent test, wherein interchange waits ampere-turn buses such as ampere-turn bus and pulse direct current to be wound with multiturn with even distribution mode on the toroid winding circumference of transient current transformer, constitute interchange respectively and wait ampere-turn bus windings such as ampere-turn bus winding and pulse direct current, by waiting ampere-turn synthesis mode to reach transient current amplitude and the enlarged areas multiple that needs.Interchange waits the electric current in ampere-turn loop to use the high capacity step-down transformer to produce, and the electric current in ampere-turn loops such as direct current uses and is filled with high-tension capacitor through reactor and resistor discharge generation.During test, the Secondary Winding of transient current transformer inserts the secondary load of regulation, promptly wait on the ampere-turn bus after the alternating current switch closes a floodgate and produce the alternating current that direct current offset is arranged in interchange, when alternating current when reaching maximal value, being filled with high-tension capacitor set discharge switch closes a floodgate, produce pulse current on ampere-turn buses such as pulse direct current, pulse current is wavefront time 20ms～30ms, two exponential waves of hemiwave time 100ms～150ms.The phase place of closing a floodgate is controlled with phase-selecting switch, so that produce the big dc offset of trying one's best.Use two capacitor alternating discharges can close transient current transformer-minute-close-minute cyclic test, two capacitors discharge simultaneously and then can carry out single and close-separating tests.No matter close-minute the circulation or close-minute-close-minute the circulation, the whole test time all is no more than 1s, has taken into full account current transformer dynamic and thermal stability time restriction.In order to offset the induced potential that alternating current loop and pulse direct current loop produce by tested transient current transformer iron core, make two to wait the ampere-turn loop to have the equal number of turn, two circuit connect by the decoupling impedance simultaneously, the size of decoupling impedance equals the resistance value that tested transient current transformer secondary circuit resulting impedance such as converts at the ampere-turn loop, and the coupling coefficient in two loops is close to zero.
The utility model has the advantages that, novel, reasonable in design, simple in structure, easy to use.One of beneficial effect is to have avoided building the huge input of high capacity surge generator more and avoid electrical network is produced damaging long-time short-circuit current rush; reduced the experimentation cost of extra-high voltage transient current transformer; two of beneficial effect is strategic materials and land resources such as a large amount of copper iron of saving; three of beneficial effect is the operation time to economize electric energy and lower the electromagnetic pollution of test current to environment greatly, and is favourable to environmental protection.
Description of drawings
Fig. 1, be ampere-turn synthetic test loop synoptic diagram such as of the present utility model.
Fig. 2, be capacitor discharge circuit theory circuit diagram.
Fig. 3, be embodiment synoptic diagram of the present utility model.
Among the figure: 1. alternating current generating means, 2. pulse direct current generating means, 3. transient current bus, 4. transient current transformer, 5. high current load case, 6. decoupling impedance, 7. AC transformer, 8. alternating current switch, 9. interchange waits the ampere-turn bus, 10. ampere-turn bus such as pulse direct current, 11. resistor, 12. reactor, 13. electric capacity A organize discharge switch, and 14. capacitor A organize charge switch, 15. electric capacity A group, 16. capacitor A organizes tungar, 17. rectifier transformers, and 18. capacitor B organize discharge switch, 19. capacitor B organizes charge switch, 20. capacitor B group, 21. capacitor B organize tungar, 22.. measuring and controlling.
Embodiment
Below, describe embodiment of the present utility model with reference to the accompanying drawings in detail.
As Fig. 1, Fig. 2, shown in Figure 3, the utility model is made up of transient current generating means, transient current bus 3 and measuring and controlling.The transient current generating means comprises alternating current generating means 1 and pulse direct current generating means 2, alternating current generating means 1 is made up of AC transformer 7 and switch 8, transient current bus 3 comprises that interchange waits ampere-turn buses 10 such as ampere-turn bus 9 and pulse direct current, they are on the toroid winding of (tested) transient current transformer 4, constitute interchange and wait ampere-turn bus windings such as ampere-turn bus winding and pulse direct current, interchange waits ampere-turn bus winding to be connected and to form ampere-turn loops such as interchange with alternating current generating means 1, ampere-turn bus windings such as direct current process switch is (among Fig. 1, the switch that adopts is electric capacity A group discharge switch 13, the switch that adopts among Fig. 3 comprises electric capacity A group discharge switch 13 and electric capacity B group discharge switch 18), reactor 12 and resistor 11 are connected and form ampere-turn loops such as direct current with one or two pulse direct current generating meanss 2, the alternating current generating means 1 and 2 electric coupling of pulse direct current generating means of measuring and controlling 22 and transient current generating means, interchange waits the sequential of ampere-turn loop discharge, the sequential of ampere-turn loops such as direct current discharge is by measuring and controlling 22 operations.Interchange waits the 10 shared decoupling impedances 6 of ampere-turn buses such as ampere-turn bus 9 and pulse direct current to form transient current bus 3.Alternating current generating means 1 and pulse direct current generating means 2 respectively by ampere-turn bus winding such as ampere-turn buses 10 such as ampere-turn bus 9 such as exchanging of transient current bus 3 and pulse direct current exchanging on the toroid winding of transient current transformer 4 and and the toroid winding electric coupling of ampere-turn bus winding such as pulse direct current and transient current transformer 4, high current load case 5 and transient current transformer 4 connect.
Shown in Figure 1 waiting in the ampere-turn synthetic test loop, adopting has alternating current generating means 1, pulse direct current generating means 2, transient current bus 3, transient current transformer 4, high current load case 5.Alternating current generating means 1 is made up of AC transformer 7 and alternating current switch 8, and the pulse direct current generating means is by resistor 11, reactor 12, electric capacity A group discharge switch 13. capacitor A group 15, capacitor A organizes charge switch 14, and capacitor A organizes tungar 16. rectifier transformer 17 is formed.The transient current bus waits ampere-turn bus 9 by interchange, ampere-turn buses 10 such as pulse direct current, and decoupling impedance 6 is formed.This utility model has adopted and has waited the ampere-turn synthetic test loop that transient current transformer 4 is carried out the transient characterisitics equivalent test, during test, the secondary side of transient current transformer 4 inserts high current load case 5, comprise two current returns that wait ampere-turn buses 10 such as ampere-turn bus 9 and pulse direct current to form respectively by interchange by decoupling impedance 6 Deng the ampere-turn synthetic test loop, respectively by alternating current generating means 1 and 2 power supplies of pulse direct current generating means, two shared decoupling impedances 6 of current return, two current returns produce pressure drop in decoupling impedance 6, offset two loops owing to wait the induced potential of ampere-turn winding by the iron core generation magnetic coupling generation of transient current transformer 4.Be wound on the transient current transformer iron core with the even distribution mode of circumference Deng ampere-turn alternating current bus and bus such as pulse direct current such as ampere-turn such as grade.
In the discharge circuit of capacitor shown in Figure 2, the capacitor C that is filled with electromotive force E by K switch to pulse direct current bus discharge with resistance R and inductance L, note τ
1=RC, τ
2=L/R is satisfying τ
1＞＞τ
2Condition under, will produce the dash current of two exponential waves.The wavefront time is about 3 τ
1, hemiwave time is about τ
2Peak point current is near E/R.
In the embodiment synoptic diagram that Fig. 3 provides, the rated current of transient current transformer 4 is 6kA, transient current 100kA, transient state area coefficient 10.The output-current rating 5kA of AC transformer 7, impedance voltage 12%.Interchange wait ampere-turn bus 9 on the toroid winding circumference of transient current transformer all around 20 circles.Interchange waits the ampere-turn impedance loop and the ratio of transformer internal impedance to be controlled at below 4, and the secondary no-load voltage of AC transformer 7 is pressed short-circuit current 25kA design.After alternating current switch 8 closes a floodgate, wait the alternating current that produces 5kA band direct current offset in the ampere-turn bus 9 in interchange.The pulse direct current electric current is by electric capacity 0.5F's. capacitor A group 15 and capacitor B group 20 be respectively by electric capacity A group discharge switch 13 and electric capacity B group discharge switch 18 discharge generation, ampere-turn buses 10 such as pulse direct current on the toroid winding circumference of transient current transformer 4 all around 20 circles.The inductance value of reactor 12 and pulse direct current etc. ampere-turn loop inductance amount with about 2mH, resistor 11 and this loop resistance and about 0.2 Ω, capacitor maximum charging voltage 3kV.Rectifier transformer 17 by commutator tube 16 and 21 and capacitor A group charge switch 14 and capacitor B group charge switch 19 respectively to capacitor A group 15 and 20 chargings of capacitor B group.The value of decoupling impedance 6 equals the value that transient current transformer 4 secondary circuit resulting impedances (equaling high current load case 5, secondary lead, Secondary Winding resistance and leakage reactance sum) such as convert at the ampere-turn winding, is about 0.15m Ω in the present embodiment.Only use capacitor A to organize, τ at 15 o'clock
1=RC ≈ 100ms, τ
2=L/R ≈ 10ms, the transient state area multiple of testing behind the capacitor discharge 100ms is about τ
1/ T, wherein T is the power current cycle, equals 20ms, like this τ
1The value of/T is substantially equal to 5.Measuring and controlling 22 drops into capacitor B group 20 at the appropriate time according to the reclosing testing requirements, can satisfy closing by two group capacitor alternating discharges-minute-close-testing requirements of minute circulation transient state enlarged areas multiple 10.The circuit of Fig. 3 also can carry out single and close-separating tests, if capacitor A group 15 and capacitor B group 20 discharge simultaneously, timeconstant
1To increase to, the transient state area of test is increased near original 2 times near original 2 times.
Claims (3)
1, special high-tension current inductor transient characteristics tester, by the transient current generating means, transient current bus and measuring and controlling are formed, it is characterized in that, measuring and controlling (22) cooperates with the transient current generating means, the transient current generating means comprises alternating current generating means (1) and pulse direct current generating means (2), transient current bus (3) comprises that interchange waits ampere-turn buses (10) such as ampere-turn bus (9) and pulse direct current, they are on the toroid winding of transient current transformer, constitute interchange and wait ampere-turn bus windings such as ampere-turn bus winding and pulse direct current, interchange waits ampere-turn bus winding to be connected and to form ampere-turn loops such as interchange with alternating current generating means (1), ampere-turn bus windings such as direct current are through switch, reactor (12) is connected and forms ampere-turn loops such as direct current with resistor (11) with pulse direct current generating means (2), and the sequential of discharge is operated by measuring and controlling (22).
2, special high-tension current inductor transient characteristics tester according to claim 1, it is characterized in that ampere-turn bus windings such as direct current are connected and form ampere-turn loops such as direct current through switch, reactor (12) and resistor (11) with one or two pulse direct current generating meanss (2).
The equal turn numbers of ampere-turn bus windings such as 3, special high-tension current inductor transient characteristics tester according to claim 1 is characterized in that, the interchange ampere-turn bus winding of Denging and pulse direct current, and use common decoupling impedance (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200671913U CN201191311Y (en) | 2008-05-15 | 2008-05-15 | Transient characteristic experiment apparatus of ultra-high-voltage current transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200671913U CN201191311Y (en) | 2008-05-15 | 2008-05-15 | Transient characteristic experiment apparatus of ultra-high-voltage current transducer |
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| Publication Number | Publication Date |
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| CN201191311Y true CN201191311Y (en) | 2009-02-04 |
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| CNU2008200671913U Expired - Lifetime CN201191311Y (en) | 2008-05-15 | 2008-05-15 | Transient characteristic experiment apparatus of ultra-high-voltage current transducer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923125A (en) * | 2009-06-12 | 2010-12-22 | 中国钢铁股份有限公司 | Measuring device of nonsinusoidal wave electromagnetic properties |
| CN103543358A (en) * | 2013-10-24 | 2014-01-29 | 昆明理工大学 | Method for defining attenuation effect of extra-high voltage transmission line and boundary on high frequency quantity |
| CN104181417A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Large-current synthesis transient state circuit for electronic current transformer |
| CN116520196A (en) * | 2023-07-03 | 2023-08-01 | 国网安徽省电力有限公司电力科学研究院 | On-line monitoring method for turn-to-turn short circuit fault of dry type air-core reactor |
-
2008
- 2008-05-15 CN CNU2008200671913U patent/CN201191311Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923125A (en) * | 2009-06-12 | 2010-12-22 | 中国钢铁股份有限公司 | Measuring device of nonsinusoidal wave electromagnetic properties |
| CN101923125B (en) * | 2009-06-12 | 2013-11-20 | 中国钢铁股份有限公司 | Measuring device of nonsinusoidal wave electromagnetic properties |
| CN103543358A (en) * | 2013-10-24 | 2014-01-29 | 昆明理工大学 | Method for defining attenuation effect of extra-high voltage transmission line and boundary on high frequency quantity |
| CN103543358B (en) * | 2013-10-24 | 2016-08-17 | 昆明理工大学 | A kind of extra high voltage direct current transmission line and the border confining method to high frequency content attenuation size |
| CN104181417A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Large-current synthesis transient state circuit for electronic current transformer |
| CN116520196A (en) * | 2023-07-03 | 2023-08-01 | 国网安徽省电力有限公司电力科学研究院 | On-line monitoring method for turn-to-turn short circuit fault of dry type air-core reactor |
| CN116520196B (en) * | 2023-07-03 | 2023-09-22 | 国网安徽省电力有限公司电力科学研究院 | On-line monitoring method for turn-to-turn short circuit fault of dry type air-core reactor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE Free format text: FORMER OWNER: WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID Effective date: 20091120 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20091120 Address after: Nanjing City, Jiangsu Province, Nan Shui Road No. 8, zip code: 210003 Patentee after: State Grid Electric Power Research Insititute Address before: Hubei province Wuhan city Hongshan District Luoyu road 143, zip code: 430074 Patentee before: Guowang Wuhan High Voltage Inst |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20090204 Effective date of abandoning: 20080515 |