CN2674738Y - Fault current limiter - Google Patents
Fault current limiter Download PDFInfo
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- CN2674738Y CN2674738Y CN 200420038426 CN200420038426U CN2674738Y CN 2674738 Y CN2674738 Y CN 2674738Y CN 200420038426 CN200420038426 CN 200420038426 CN 200420038426 U CN200420038426 U CN 200420038426U CN 2674738 Y CN2674738 Y CN 2674738Y
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- prebreakdown
- capacitor
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- voltage switch
- switch gear
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Abstract
The utility model relates to a fault current limiter which is based on the principle of the series connection high voltage switch prebreakdownand which is in resonant mode. The utility model is characterized in that: a capacitor and an inducer compose a series resonant circuit; the prebreakdown high voltage switch is used as the element of the parallel connection short circuit, and switch has limiting electrical inductance in a series connection mode. When the system is in short circuit state, the voltage of the capacitor rapidly raises and exceeds the breakdown voltage among the switch contacts, the phenomenon of breakdown is caused, and the capacitor is short circuit; accordingly, the series resonance state is broken, and the suppression for the short circuit current is realized. The utility model has the advantages of simple structure, small ground occupying, convenient implement, low price, high reliability, etc., and the utility model doesn't need to be additionally provided with relay protection.
Description
Technical field
The utility model belongs to short-circuit fault of power system current limliting research field, particularly relates to a kind of series resonance-type fault current limiter based on high-voltage switch gear prebreakdown principle.
Background technology
Along with developing rapidly of China's scale of power, the short circuit current level of some developed regions superhigh pressure (220kV and 500kV) electrical network increases day by day, can reach 60kA even more than the 80kA, not only making electrical network not have primary cut-out can select for use, also cause relevant power equipment thermal effect and dynamo-electric effect excessive, influence power grid security.That brings thus is also serious day by day to problems such as the electromagnetic interference of communication system and step voltages.In the technology and measure of many limiting short-circuit currents, fault current limiter is a kind of visual plant.
In recent or middle long term, the superconduct fault current limiter is because technical not mature enough, reliability still need many-sided research and cost reason such as too big economically, still difficulty is put to practicality at present, thereby people then pay close attention to non-superconducting type fault current limiter, wherein the series resonance-type fault current limiter obviously occupy the first in every performance index.The electric power of American I EEE in 2003 and energy periodical (IEEE Transactions on Power and Energy Magazine) are at the 26th～30 page of the 5th phase; reported the series resonance-type fault current limiter of power electronics formula; adopt the short-circuit device of high-voltage large-capacity power electronic device (as thyristor etc.), but this flow restricter has in design with in using at present: complex structure, need set up that extremely fast multiple relaying protection, operational reliability are relatively poor, shortcoming such as involve great expense as capacitor.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, operational reliability is high, cheap and the series resonance-type fault current limiter based on high-voltage switch gear prebreakdown principle that technical and economic performance is good.
The utility model is realized in the following manner: a kind of fault current limiter, comprise capacitor, inductor, it is characterized in that: further comprising prebreakdown type high-voltage switch gear, current-limiting inductance, capacitor becomes series resonant circuit with bank of inductors, prebreakdown type high-voltage switch gear is connected with current-limiting inductance, and string has the short-circuit component of the prebreakdown type high-voltage switch gear of current-limiting inductance as capacitor.When the big electric current of system burst short circuit generation passes through fault current limiter, voltage on the capacitor will rise rapidly, in in short-term, surpass the puncture voltage between prebreakdown type high-voltage switch contact, cause that punch-through between contact is with capacitor short-circuit, thereby break the series resonance state under the normal running conditions, realization is to the inhibition of short-circuit current, and the type of prebreakdown simultaneously high-voltage switch gear closes a floodgate fast, in order to avoid contact suffers heavy current electric arc long period scaling loss.The current-limiting inductance of prebreakdown type high-voltage switch gear series connection is used to limit prebreakdown current.Behind the failure removal, prebreakdown type high-voltage switch gear is separating brake at once, and circuit recovers resonance condition.
Above-mentioned fault current limiter is characterized in that: the fracture normal working voltage of the prebreakdown type high-voltage switch gear of capacitor parallel connection is 6kV, and the fracture puncture voltage is 12-18kV.
Above-mentioned fault current limiter is characterized in that: the closing of prebreakdown type high-voltage switch gear, sub-switching operation, by finishing automatically by the electromagnet of prebreakdown current control; When the contact gap breakdown was through-flow, electromagnet produced suction, and prebreakdown type high-voltage switch gear is closed a floodgate rapidly; After short circuit current disappeared, suction reduced, prebreakdown type high-voltage switch gear automatic brake separating.
The beneficial effects of the utility model are: do not need power electronic device and control appliance thereof; prebreakdown type high-voltage switch gear can be improved by general on-load switch and design; no technological difficulties, therefore have simple in structure, be easy to implement, low price, reliability height, need not to establish in addition advantage such as relaying protection.
Description of drawings
Fig. 1 is circuit theory of the present utility model and implements winding diagram.
Fig. 2 is the l-G simulation test circuit diagram of the utility model embodiment (single-phase 220kV system).
Fig. 3 is the short circuit current waveform of sudden short circuit when capacitor is not installed prebreakdown type high-voltage switch gear in the l-G simulation test.
Fig. 4 is the capacitance voltage waveform of sudden short circuit when capacitor is not installed prebreakdown type high-voltage switch gear in the l-G simulation test.
Fig. 5 is the short circuit current waveform during sudden short circuit behind the capacitor prebreakdown type in parallel high-voltage switch gear in the l-G simulation test.
Among the figure, 1 is capacitor, and 2 is inductor, and 3 are prebreakdown type high-voltage switch gear, and 4 is current-limiting inductance, and 5 is the flow restricter equivalent resistance, and 6 is 220kV system single-phase electricity potential source, and 7 is source resistance, and 8 is the power supply inductance.
Embodiment
Provide a most preferred embodiment of the present utility model below in conjunction with accompanying drawing.
Enforcement wiring of the present utility model is undertaken by Fig. 1 principle, and wherein: capacitor 1 is 1072 μ F; Inductor 2 is 10mH; The fracture normal working voltage of prebreakdown type high-voltage switch gear 3 is 6kV, and the frequency breakdown voltage scope is 12-18kV; Current-limiting inductance 4 is 1mH.Capacitor 1 is formed series resonant circuit with inductor 2, and string has the short-circuit component of the prebreakdown type high-voltage switch gear 3 of current-limiting inductance 4 as capacitor 1.
When the big electric current of system burst short circuit generation passes through fault current limiter, voltage on the capacitor will rise rapidly, the puncture voltage that in short-term, surpasses prebreakdown type high-voltage switch gear 3, cause that punch-through between contact is with capacitor short-circuit, thereby break the series resonance state under the normal running conditions, realization is to the inhibition of short-circuit current, and the control electromagnet of the type of prebreakdown simultaneously high-voltage switch gear 3 is finished closing operation automatically, in order to avoid contact suffers heavy current electric arc long period scaling loss.The current-limiting inductance 4 of prebreakdown type high-voltage switch gear 3 series connection is used to limit prebreakdown current.Behind the failure removal, the control electromagnet of prebreakdown type high-voltage switch gear 3 is finished sub-switching operation automatically, and circuit recovers resonance condition.
Fig. 2 is for showing a l-G simulation test circuit of (220kV system) current limitation effect among the utility model embodiment.Wherein: flow restricter equivalent resistance 5 is 0.225 Ω; 220kV system single-phase electricity potential source 6 is 127kV; Source resistance 7 is 0.225 Ω; Power supply inductance 8 is 10mH.L-G simulation test is divided into two kinds of situations:
The electric current and the voltage waveform of system burst short circuit when (1) analog capacitor does not have prebreakdown type high-voltage switch gear 3 in parallel and current-limiting inductance 4.Fig. 3 is the short circuit current waveform, electric current 19kA/ lattice, time 0.015s/ lattice; Fig. 4 is the capacitance voltage waveform, voltage 87.5kV/ lattice, time 0.01s/ lattice.This moment, the nearly 90kA of peak value beat frequency phenomenon appearred, in short circuit current; Capacitor powers on to press to rise and is exceedingly fast, and can reach tens kV in several ms.The analysis showed that; regardless of the short circuit phase place; as long as the short-circuiting means of design capacitance moves in 4-5ms, the short circuit current effective value all can be limited in 20kA by 40kA, and (corresponding peak value of short is in the 20kA * 2.55=51kA), and can capacitor for voltage protection not breakdown.This is the basic place of design prebreakdown type high-voltage switch gear.
(2) the short circuit current waveform during the 4 back system burst short circuits of prebreakdown type high-voltage switch gear 3 in parallel and current-limiting inductance on the analog capacitor, wherein the fracture puncture voltage instantaneous value of Bing Lian prebreakdown type high-voltage switch gear 3 is 25kV.Fig. 5 is the short circuit current waveform, electric current 10kA/ lattice, time 0.02s/ lattice.Short circuit current this moment (effective value) and does not have aperiodic component less than 20kA, and the utility model shows as good current limiting characteristic.
Prebreakdown type high-voltage switch gear 3 needs special design in the utility model, and its performance parameter and control mode are as follows:
(1) fracture normal working voltage: 6kV;
(2) fracture punctures power-frequency voltage: 12-18kV;
(3) reach alternate rated voltage: 220kV over the ground;
(4) rated current: 0A;
(5) short time withstand current peak value: 51kA;
(6) 3 seconds short time withstand current: 20kA;
(7) specified making current peak value: 25kA;
(8) specified drop-out current: 4kA;
(9) separating brake, closing time: no specific (special) requirements.
The closing of prebreakdown type high-voltage switch gear 3, sub-switching operation are by realizing automatically by the electromagnet of prebreakdown current control.When the contact gap breakdown was through-flow, electromagnet produced suction, makes prebreakdown type high-voltage switch gear 3 automatic closings; After short circuit current disappeared, suction reduced, prebreakdown type high-voltage switch gear automatic brake separating.
Claims (3)
1. fault current limiter, comprise capacitor [1], inductor [2], it is characterized in that: further comprising prebreakdown type high-voltage switch gear [3], current-limiting inductance [4], capacitor [1] is formed series resonant circuit with inductor [2], prebreakdown type high-voltage switch gear [3] is connected with current-limiting inductance [4], and string has the short-circuit component of the prebreakdown type high-voltage switch gear [3] of current-limiting inductance [4] as capacitor [1].
2. fault current limiter according to claim 1 is characterized in that: the fracture normal working voltage of the prebreakdown type high-voltage switch gear [3] that capacitor [1] is in parallel is 6kV, and the fracture puncture voltage is 12-18kV.
3. fault current limiter according to claim 1 is characterized in that: the closing of prebreakdown type high-voltage switch gear [3], sub-switching operation, control automatically by electromagnet by prebreakdown current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420038426 CN2674738Y (en) | 2004-02-19 | 2004-02-19 | Fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420038426 CN2674738Y (en) | 2004-02-19 | 2004-02-19 | Fault current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2674738Y true CN2674738Y (en) | 2005-01-26 |
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ID=34484017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420038426 Expired - Fee Related CN2674738Y (en) | 2004-02-19 | 2004-02-19 | Fault current limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2674738Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646968A (en) * | 2012-05-04 | 2012-08-22 | 中国科学院电工研究所 | Reactor type short-circuit fault current limiter |
| CN103078306A (en) * | 2013-01-09 | 2013-05-01 | 中国科学院电工研究所 | Fault current limiter on basis of combined rapid switch-on switch |
| CN104330616B (en) * | 2014-11-05 | 2017-06-06 | 中国科学院电工研究所 | A kind of power network alternating current virtual value real-time detection method |
| CN114113944A (en) * | 2021-11-25 | 2022-03-01 | 广东电网有限责任公司 | CVT capacitor unit breakdown defect test method and device |
-
2004
- 2004-02-19 CN CN 200420038426 patent/CN2674738Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646968A (en) * | 2012-05-04 | 2012-08-22 | 中国科学院电工研究所 | Reactor type short-circuit fault current limiter |
| CN103078306A (en) * | 2013-01-09 | 2013-05-01 | 中国科学院电工研究所 | Fault current limiter on basis of combined rapid switch-on switch |
| CN104330616B (en) * | 2014-11-05 | 2017-06-06 | 中国科学院电工研究所 | A kind of power network alternating current virtual value real-time detection method |
| CN114113944A (en) * | 2021-11-25 | 2022-03-01 | 广东电网有限责任公司 | CVT capacitor unit breakdown defect test method and device |
| CN114113944B (en) * | 2021-11-25 | 2023-10-20 | 广东电网有限责任公司 | CVT capacitor unit breakdown defect test method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |