CN1508930A - Fault current limiting circuit - Google Patents
Fault current limiting circuit Download PDFInfo
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- CN1508930A CN1508930A CNA021568251A CN02156825A CN1508930A CN 1508930 A CN1508930 A CN 1508930A CN A021568251 A CNA021568251 A CN A021568251A CN 02156825 A CN02156825 A CN 02156825A CN 1508930 A CN1508930 A CN 1508930A
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Abstract
The circuit composed of parallel-connected equivalent AC current source and current limiting resistor through transformer is connected to system in series, installed at line outlet of electric power system and cascaded to a breaker. When system is in normal running, the circuit is no influence on the system. When system failed, the circuit works to limit peak value and steady state value of short circuit current immediately and automatically. The invention possesses features of high efficiency, simple structure, reliable and suitable to transmission and distribution network so as to solve too large failure current, and lower current tolerance for requiring each electric component. The circuit raises stability, safety and reliability if it is utilized in high voltage or supervoltage transmission.
Description
Technical field:
The present invention relates to a kind of failure current limit circuit that is used for transmission and distribution network, belong to electrical technology field.
Background technology:
Because power system development, the increase of load, the input of big capacity unit and power plant and converting equipment, especially the appearance of load center high-power station and large power system is interconnected, make the transmission and distribution network capacity greatly increase, simultaneously short circuit current level is increased day by day, short circuit current level has surpassed the capacity that cut-offs of present circuit breaker even.Do not controlled if do not take measures, the equipment investment of new electric substation is increased greatly, and will be produced very big influence, even need a large amount of investment of cost to transform, reconstruct and change original substation facilities in the system.
Prior art is mainly taked the short circuit current in the following method restriction electric power system transmission and distribution network:
1, the high one-level electrical network of development, low voltage electric network burst or with bus apportion, partition running, even with grid disconnection, and adopt dc online, and these measures are not only invested very big, and relate to the challenges such as stability of electrical network, and non-haveing no alternative but do not adopted.
2, adopt high-impedance transformer or series reactor.In electrical power trans mission/distribution system, adopt, not only can increase network loss, also can reduce the stability of system.
3, change circuit breaker, existing electric substation is carried out capacity-increasing transformation.Cost is too big, and the existing circuit breaker capacity possibly can't meet the demands.
Summary of the invention:
For overcoming the deficiency of prior art, the invention provides a kind of failure current limit circuit that is used for transmission and distribution network, it is simple in structure, but limiting short-circuit current peak value and steady-state value.
The present invention inserts electric power system by connecting the transformer series connection after by equivalent ac current source, current-limiting resistance parallel connection, is connected in the front of system line exit circuit breaker.When system normally moves, system there is not influence; Can drop into automatically at once after the system failure, but limiting short-circuit current peak value and steady-state value.The present invention not only can reduce the impact of fault current to electric power system, and makes original circuit breaker disengagement failure electric current reliably.
Description of drawings:
Fig. 1 is the schematic diagram of the present invention in single phase system, and AC is the single-phase output of electric power system, DL circuit breaker, I
SThe equivalence ac current source, R current-limiting resistance, T transformer, R
LLine resistance, X
LLine reactance, Z
LoadLoad impedance;
Fig. 2 is the schematic diagram of the present invention in three-phase system, and A, B and C are the three-phase output of electric power system, DL circuit breaker, I
SThe equivalence ac current source, R current-limiting resistance, T
A, T
BWith T
CBe transformer, R
LLine resistance, X
LLine reactance, Z
LoadLoad impedance;
Fig. 3 is the application example of the present invention in single phase system, and AC is the single-phase output of electric power system, DL circuit breaker, R
LLine resistance, X
LLine reactance, load impedance Z
Load, I
SThe equivalence ac current source, R current-limiting resistance, T transformer, HTS-L inductance, DC controlled rectification, G
1, G
2, G
3, G
4Be insulation gate pole bipolar transistor IGBT.
Fig. 4 is the application example of the present invention in three-phase system, the three-phase output of A, B and C electric power system, DL circuit breaker, R
LLine resistance, X
LLine reactance, Z
LoadLoad impedance, I
SThe equivalence ac current source, R current-limiting resistance, T
A, T
BWith T
CBe transformer, DC controlled rectification, HTS-L inductance, G
1, G
2, G
3, G
4, G
5With G
6Be insulation gate pole bipolar transistor IGBT.
Embodiment:
Below in conjunction with drawings and Examples the present invention is described further.
Current limliting accumulator provided by the invention is shown in frame of broken lines among Fig. 1, Fig. 2.In Fig. 1 single phase system, the present invention is connected in electric power system AC line outlet place, and DL is in series with circuit breaker, and it is by equivalent ac current source I
SWith after the current-limiting resistance R parallel connection by being connected transformer T series connection connecting system; In Fig. 2 three-phase system, the present invention is connected to three-phase A, B and C line outlet place and circuit breaker DL and is in series, and three-phase is respectively by equivalent ac current source I
SWith after the current-limiting resistance R parallel connection by being connected transformer T
A, T
BWith T
CThe connecting system of connecting respectively.R among Fig. 1, Fig. 2
L, X
LWith Z
LoadBe respectively line resistance, line reactance and load impedance.Equivalence ac current source I
SCan provide the operating amplitude of system, all adjustable electric current of phase place, the maximum load current that its amplitude is no more than system when normally moving.When system normally moves, regulate equivalent ac current source I
SThe electric current that provides makes itself and system power, that is to say the connection transformer T that connects in Fig. 1 single phase system in transformer T or Fig. 2 three-phase system
A, T
BWith T
cThe size of current that flows through equates that direction is opposite, and the electric current that at this moment flows through current-limiting resistance R is zero, is equivalent to connect in Fig. 1 single phase system the connection transformer T in transformer T or Fig. 2 three-phase system
A, T
BWith T
CSecondary short circuit, this moment the present invention system is not had influence.When system is short-circuited fault, also promptly works as fault current and surpass equivalent ac current source I
SDuring the offset current that can provide, system power flows through current-limiting resistance R at once automatically, that is to say that current-limiting resistance R drops at once automatically to carry out failure current limit.
Among Fig. 3 one embodiment of the present of invention.The present invention is installed on electric power system AC line outlet place and circuit breaker DL is in series, wherein R
L, X
LWith Z
LoadBe respectively line resistance, line reactance and load impedance.Equivalence ac current source I
SInsulation gate pole bipolar transistor IGBT G for the bridge-type connection
1, G
2, G
3, G
4The single-phase current current transformer of forming, its DC side constitute after by controlled rectification DC and inductance HTS-L series connection, connect the former limit of the single-phase connection transformer T connecting system of connecting after exchanging outlet side and current-limiting resistance R parallel connection with the single-phase transformer T secondary that is connected.Wherein inductance HTS-L adopts the almost nil superconduction inductance of resistance, can reduce loss greatly, has improved the efficient of device, can also be common inductance.When system normally moved, electric current that current source converter provides and system power that is to say that the size of current that connection transformer T flows through equates, direction is opposite, at this moment the electric current that flows through current-limiting resistance R is zero, is equivalent to connect the secondary short circuit of transformer T, and the present invention's this moment does not have influence to system.When system was short-circuited fault, also promptly when fault current surpasses the offset current that current source converter can provide, system power flow through current-limiting resistance R at once automatically, that is to say that current-limiting resistance R drops at once automatically to carry out failure current limit.During the system failure, but its limiting short-circuit current peak value and steady-state value makes original circuit breaker to disconnect big fault current.
Fig. 4 is another embodiment of the present invention.As shown in Fig. 4 frame of broken lines, the present invention is installed on A in the system, B and C three-phase line exit and circuit breaker DL and is in series, wherein R
L, X
LWith Z
LoadBe respectively each phase line resistance, line reactance and load impedance.Equivalence ac current source I
SInsulation gate pole bipolar transistor IGBT G for the bridge-type connection
1, G
2, G
3, G
4, G
5With G
6The three-phase current source current transformer of forming, its DC side constitute after being connected by controlled rectification DC and inductance HTS-L, and what exchange outlet side respectively is connected three star-like single-phase connection transformer T that are connected of secondary side respectively with after three current-limiting resistance R parallel connection mutually
A, T
BWith T
CSecondary, connect transformer T
A, T
BWith T
CThe access electric power system of connecting respectively of former limit.Wherein inductance HTS-L adopts the almost nil superconduction inductance of resistance, can reduce loss greatly, has improved the efficient of device, can also be common inductance.What system flow through inductance when normally moving is a direct current, and system is when normally moving, and electric current and system power that three-phase current source current transformer provides that is to say to connect transformer T
A, T
BWith T
CThe size of current that flows through equates that direction is opposite, and the electric current that at this moment flows through current-limiting resistance R is zero, is equivalent to connect transformer T
A, T
BWith T
CSecondary short circuit, this moment the present invention system is not had influence.When system is short-circuited fault, also promptly surpass the offset current that current source converter can provide when fault current, system power flows through current-limiting resistance R at once automatically, that is to say that current-limiting resistance R drops at once automatically to carry out failure current limit.During the system failure, but its limiting short-circuit current peak value and steady-state value makes original circuit breaker to disconnect big fault current.
Efficient height of the present invention, simple in structure, reliably, be used for transmission and distribution network, not only solve system failure electric current problems of too, but also greatly reduced the requirement of the anti-flow of each components and parts in the system, reduced the designing requirement of system, if be used for high pressure or supergrid stability, fail safe and the reliability of raising system greatly.
In 220V single phase system test, when the resistance value of current-limiting resistance R was 5 times of system impedance, fault current can be restricted to the peak value about 40% of original fault current, steady-state value about 20%.
Claims (4)
1. a failure current limit circuit is characterized in that it is by equivalent ac current source [I
S] in parallel back by being connected the front that transformer [T] is connected in series in circuit on power system exit circuit breaker with current-limiting resistance [R].
2. by the described failure current limit circuit of claim 1, it is characterized in that equivalent ac current source [I
S] be current source converter, its DC side is composed in series by controlled rectification [DC] and inductance [HTS-L].
3. by the described failure current limit circuit of claim 2, it is characterized in that equivalent ac current source [I in the Monophase electric power system
S] be the single-phase current current transformer, it is connected the secondary of single-phase connection transformer [T] with current-limiting resistance [R] back in parallel, and single-phase connection transformer [T] former limit series connection inserts electric power system.
4. by the described failure current limit circuit of claim 2, it is characterized in that equivalent ac current source [I in three-phase electrical power system
S] be three-phase current source current transformer, it each output mutually is connected three star-like single-phase connection transformer [T that are connected of secondary side respectively with after three current-limiting resistance R parallel connection
A], [T
B] and [T
C] secondary, connect transformer [T
A], [T
B] and [T
C] the access electric power system of connecting respectively of former limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021568251A CN100370667C (en) | 2002-12-19 | 2002-12-19 | Fault current limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021568251A CN100370667C (en) | 2002-12-19 | 2002-12-19 | Fault current limiting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1508930A true CN1508930A (en) | 2004-06-30 |
| CN100370667C CN100370667C (en) | 2008-02-20 |
Family
ID=34236419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021568251A Expired - Fee Related CN100370667C (en) | 2002-12-19 | 2002-12-19 | Fault current limiting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100370667C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995557A (en) * | 2010-10-14 | 2011-03-30 | 中国科学院等离子体物理研究所 | Method for testing bearing capability of short trouble in high-power converter |
| CN102263403A (en) * | 2011-07-22 | 2011-11-30 | 中国科学院电工研究所 | Impedance switching device |
| WO2023043371A3 (en) * | 2021-09-17 | 2023-04-27 | Nanyang Technological University | A power controller |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2572227B1 (en) * | 1984-10-24 | 1990-03-23 | Alsthom Atlantique | DEVICE FOR LIMITING THE VARIATION SPEED OF AN ALTERNATING CURRENT PROVIDED BY A SUPERCONDUCTING GENERATOR |
| JP2998711B2 (en) * | 1997-08-19 | 2000-01-11 | 日新電機株式会社 | Distributed power supply with sag protection |
| CN1134094C (en) * | 2002-04-29 | 2004-01-07 | 清华大学 | Voltage compensating method of serially connected electrical energy quality compensator |
-
2002
- 2002-12-19 CN CNB021568251A patent/CN100370667C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995557A (en) * | 2010-10-14 | 2011-03-30 | 中国科学院等离子体物理研究所 | Method for testing bearing capability of short trouble in high-power converter |
| CN101995557B (en) * | 2010-10-14 | 2013-04-17 | 中国科学院等离子体物理研究所 | Method for testing bearing capability of short trouble in high-power converter |
| CN102263403A (en) * | 2011-07-22 | 2011-11-30 | 中国科学院电工研究所 | Impedance switching device |
| CN102263403B (en) * | 2011-07-22 | 2014-01-22 | 中国科学院电工研究所 | Impedance switching device |
| WO2023043371A3 (en) * | 2021-09-17 | 2023-04-27 | Nanyang Technological University | A power controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100370667C (en) | 2008-02-20 |
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