CN1595583A - DC superconducting fault current limiter - Google Patents
DC superconducting fault current limiter Download PDFInfo
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- CN1595583A CN1595583A CN 200410013346 CN200410013346A CN1595583A CN 1595583 A CN1595583 A CN 1595583A CN 200410013346 CN200410013346 CN 200410013346 CN 200410013346 A CN200410013346 A CN 200410013346A CN 1595583 A CN1595583 A CN 1595583A
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- coil
- current
- superconduction
- superconducting
- current limiting
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Abstract
The invention supplies a DC superconduction fault current limiter, whose structure is: two superconduction coupling coil w1 and w2, has the same inductance wrapped on ring shaped core and one superconduction coil w1 is current limiting inductor whose two ends are connected to load loop, and another superconduction coil w2 as bias winding is connected to DC power source E2 and resistor R2 in series, w1 and w2 cooled by cooling device current limiting effect. The invention has advantages is: notable current limiting effect and low loss; short response time and high reliability, when the system operates normally, superconduction coil has very small stored energy and won't create overvoltage after accident protection; detecting, triggering and current limiting are integrated without need of adding control circuit, simple structure and small volume. The invention can satisfy DC fault protective device of individual system such as ship, plane, oil platform, mobile communication station and electric automobile.
Description
Technical field
The present invention is a kind of direct current power system failure protecting device.
Background technology
For limiting short-circuit current, usually the method that adopts is that dc circuit breaker is installed, and when system broke down, circuit breaker cutting-off of short-circuit electric current reached the purpose of error protection.At present, dc circuit breaker mainly comprises change-over circuit and AC circuit breaker, after the failed shorted, produces an artificial current zero by change-over circuit, cut-offs short circuit current with AC circuit breaker again.Because move after the change-over circuit of circuit breaker need detect short-circuit signal, so the reaction time of circuit breaker is longer, this is unfavorable for the quick protection of electric power system; During because of normal operation, the circuit breaker energy stored is very big, so, when error protection, overvoltage will appear.
Summary of the invention
The objective of the invention is to overcome above-mentioned existing dc circuit breaker reaction time length and produce superpotential shortcoming, a kind of DC superconducting fault current limiter is provided.This DC superconducting fault current limiter integrates detection, triggering, current limliting, and reaction speed is fast, and can not produce overvoltage, and fail safe is good.
For achieving the above object, the technical solution used in the present invention is: on annular core, the superconducting-coupled coil that two inductance of coiling equate, two of one of them superconducting coil terminates in the load circuit, another superconducting coil and DC power supply and resistance are in series, and superconducting-coupled coil cools off with cooling device.
The invention has the advantages that:
Present Low ESR even zero impedance when (1) moving, only when breaking down, present big impedance, thereby current limitation effect is obvious, the normal operation characteristic of system is not had influence, and running wastage is extremely low.
(2) response time weak point, the reliability height, and also when system normally moved, the superconducting coil storage power was very little, can not produce overvoltage after the error protection.
(3) integrate detection, triggering, current limliting, simple in structure, need not add control circuit, and because the high advantage of superconductor current carrying density can make that the flow restricter volume is less.
Description of drawings
Fig. 1 is the circuit diagram of the present invention in direct current system.
Fig. 2 is the structural representation of an embodiment of the present invention.
Fig. 3 is the structural representation of a kind of cooling device among the present invention.
Fig. 4 (a) presentation graphs 1 is short-circuited after the fault, and the load circuit electric current of flow restricter is not installed, and its abscissa is time/s, and ordinate is electric current/A.
Fig. 4 (b) presentation graphs 1 is short-circuited after the fault, and the load circuit electric current of flow restricter is installed, and its abscissa is time/s, and ordinate is electric current/A.
Fig. 5 is the circuit diagram of the present invention in the rectification DC source.
Fig. 6 (a) presentation graphs 5 is short-circuited after the fault, and the electric current of the AC side a phase of flow restricter is not installed, and its abscissa is time/s, and ordinate is electric current/A.
Fig. 6 (b) presentation graphs 5 is short-circuited after the fault, and the current waveform of the AC side a phase of flow restricter is installed, and its abscissa is time/s, and ordinate is electric current/A.
Embodiment
By Fig. 1, shown in Figure 2, the DC power supply of load circuit is E
1, load resistance is R
1, on annular core 1, the superconducting-coupled coil W that two inductance of coiling equate
1, W
2, one of them superconducting coil W
1As current-limiting inductor, two terminate in the load circuit, another superconducting coil W
2As bias coil, with DC power supply E
2And resistance R
2Be in series superconducting-coupled coil W
1, W
2Cool off with cooling device.
Coupling coil W
1, W
2Can adopt superconductor (as cryogenic superconductor NbTi, high-temperature superconductor Bi2223/Ag etc.) coiling.Cooling device can adopt the low-temperature (low temperature) vessel that cooling agent is housed to cool off, and determines cooling agent and chilling temperature according to the superconductor that uses.
As shown in Figure 3, Fig. 3 is a kind of existing cooling device, wherein: the 2nd, cooling agent (liquid nitrogen or liquid helium) inlet, the 3rd, cooling agent vapor outlet port, the 4th, pressure regulation tube, the 5th, coupling coil W
1, W
2Current feed, the 6th, cooler, 7 comprise coupling coil W
1, W
2. and iron core 1,8th, cooling agent.
During normal the operation, regulate bias direct current power supply E
2, make the biasing circuit current i
2With the load circuit current i
1Equate that direction is opposite.Like this, two superconducting-coupled coil W
2And W
1The magnetic flux that produces is cancelled each other, and magnetic flux is zero in the iron core, and this moment, flow restricter presented Low ESR, and system is not had influence.
When being short-circuited fault, the electric current of load circuit increases, superconducting coil W
1Automatically carry out current limliting, short circuit current is by superconducting coil W
1Self-induction L restriction, flow restricter can be in 0.1s be limited in fault current 2～3 times of normal value, has good current limitation effect.Because of the load current i after the short circuit
1Be inversely proportional to the self-induction L of superconducting coil, promptly superconducting coil self-induction L is big more, and then current limitation effect is good more, so its current limitation effect can also be further improved by improving the self-induction L of superconducting coil.
Available DC current source substitutes above-mentioned DC power supply E
2And resistance R
2, adopt DC current source to reduce the wastage.
Effect of the present invention 1 load circuit power supply for example is made as desirable DC power supply, as shown in Figure 1, and power supply E
1=340V, power supply E
2=300V, resistance R
1=8.6 Ω, resistance R
2=8.4 Ω, self-induction L=1H, coupling coefficient k=0.98, when time t=5s, fault is short-circuited.
Shown in Fig. 4 (a), the system of being unkitted flow restricter, before the short circuit, load current i
1Be 35.4A; In 0.1s after the short circuit the time, load current i
1Reach steady-state value 336A rapidly.
Shown in Fig. 4 (b), the system of flow restricter is housed, before the short circuit, load current i
1Be 35.4A; In time, flow restricter can be with load current i at 0.1s after the short circuit
1Be limited in about 90A.As seen, the current limitation effect of flow restricter is obvious.
Effect of the present invention 2 load circuit power supplys for example is made as rectification DC power supply, as shown in Figure 5, and U
a=311sin (ω t) V, U
b=311sin (ω t-120 °) V, U
c=311sin (ω t+120 °) V, three-phase bridge rectifier circuit, pilot angle α=0; Resistance R
1=10 Ω, resistance R
2=9 Ω, self-induction L=1H, coupling coefficient k=0.98, when time t=5s, fault is short-circuited.
Shown in Fig. 6 (a), the system of being unkitted flow restricter, before the short circuit, AC side a phase current i
aAmplitude be 47A; In 0.1s after the short circuit the time, the current i of AC side a phase
aAmplitude reach steady-state value 510A rapidly.
Shown in Fig. 6 (b), the system of flow restricter is housed, before the short circuit, AC side a phase current i
aAmplitude be 47A; In time, flow restricter can be with AC side a phase current i at 0.1s after the short circuit
aAmplitude limitation about 125A.As seen, the current limitation effect of flow restricter is obvious.
In Fig. 6 (a), 6 (b), display AC electric contains big harmonic wave, and this is because Fig. 5 only is in order to check current limitation effect of the present invention, in rectifier, does not take corresponding harmonic carcellation measure.When practical application, should take the measure of harmonic carcellation according to the requirement of AC side to harmonic wave.
Claims (2)
1. DC superconducting fault current limiter is characterized in that: on annular core (1), and the superconducting-coupled coil W that two inductance of coiling equate
1, W
2, one of them superconducting coil W
1Two terminate in the load circuit another superconducting coil W
2With DC power supply E
2And resistance R
2Be in series superconducting-coupled coil W
1, W
2Cool off with cooling device.
2. DC superconducting fault current limiter according to claim 1 is characterized in that: substitute above-mentioned DC power supply E with DC current source
2And resistance R
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100133461A CN1295729C (en) | 2004-06-23 | 2004-06-23 | DC superconducting fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100133461A CN1295729C (en) | 2004-06-23 | 2004-06-23 | DC superconducting fault current limiter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1595583A true CN1595583A (en) | 2005-03-16 |
| CN1295729C CN1295729C (en) | 2007-01-17 |
Family
ID=34662911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100133461A Expired - Fee Related CN1295729C (en) | 2004-06-23 | 2004-06-23 | DC superconducting fault current limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1295729C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362720C (en) * | 2005-12-08 | 2008-01-16 | 华中科技大学 | Active superconducting direct current limiter |
| CN102005349A (en) * | 2010-12-09 | 2011-04-06 | 武汉长海电气科技开发有限公司 | Current limiter |
| CN102064542A (en) * | 2010-12-14 | 2011-05-18 | 东南大学 | Impedance composite superconducting fault current limiter based on novel superconducting material |
| CN102496679A (en) * | 2011-11-03 | 2012-06-13 | 上海交通大学 | Liquid nitrogen low-temperature system for superconducting current limiter |
| CN103823502A (en) * | 2014-02-20 | 2014-05-28 | 中国北方车辆研究所 | Current-limiting hybrid power controller |
| CN104457845B (en) * | 2014-11-14 | 2016-09-07 | 华中科技大学 | A kind of solenoid type superconducting coil measurement apparatus |
| CN107819326A (en) * | 2016-09-12 | 2018-03-20 | 天津大学 | A kind of new superconductive direct current limiter |
| CN108767833A (en) * | 2018-07-27 | 2018-11-06 | 国电南瑞科技股份有限公司 | Single-phase magneto-restrictive fault current limiter |
| CN110311364A (en) * | 2019-06-18 | 2019-10-08 | 全球能源互联网欧洲研究院 | A kind of direct fault current limiter and DC transmission system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2629956A1 (en) * | 1988-04-07 | 1989-10-13 | Alsthom | CURRENT LIMITER |
| US5225957A (en) * | 1989-05-22 | 1993-07-06 | Kabushiki Kaisha Toshiba | Current limiting device |
| US5241447A (en) * | 1991-02-27 | 1993-08-31 | The United States Of America As Represented By The Secretary Of The Air Force | Magnetic switch structure and method employing superconductive material |
| JPH04359626A (en) * | 1991-06-04 | 1992-12-11 | Tokyo Electric Power Co Inc:The | Current limiter |
| JP3773333B2 (en) * | 1997-09-09 | 2006-05-10 | 住友電気工業株式会社 | Current limiter |
| KR100285600B1 (en) * | 1998-10-20 | 2001-04-02 | 주백 | Superconducting fault current limiting device with damping element |
| US6751075B2 (en) * | 2001-12-12 | 2004-06-15 | The University Of Chicago | Superconducting fault current controller/current controller |
| CN2731803Y (en) * | 2004-06-23 | 2005-10-05 | 华中科技大学 | D.C. superconductive fault current limiter |
-
2004
- 2004-06-23 CN CNB2004100133461A patent/CN1295729C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362720C (en) * | 2005-12-08 | 2008-01-16 | 华中科技大学 | Active superconducting direct current limiter |
| CN102005349A (en) * | 2010-12-09 | 2011-04-06 | 武汉长海电气科技开发有限公司 | Current limiter |
| CN102005349B (en) * | 2010-12-09 | 2013-09-04 | 武汉长海电气科技开发有限公司 | Current limiter |
| CN102064542A (en) * | 2010-12-14 | 2011-05-18 | 东南大学 | Impedance composite superconducting fault current limiter based on novel superconducting material |
| CN102064542B (en) * | 2010-12-14 | 2013-04-03 | 东南大学 | Impedance composite superconducting fault current limiter based on novel superconducting material |
| CN102496679A (en) * | 2011-11-03 | 2012-06-13 | 上海交通大学 | Liquid nitrogen low-temperature system for superconducting current limiter |
| CN103823502A (en) * | 2014-02-20 | 2014-05-28 | 中国北方车辆研究所 | Current-limiting hybrid power controller |
| CN104457845B (en) * | 2014-11-14 | 2016-09-07 | 华中科技大学 | A kind of solenoid type superconducting coil measurement apparatus |
| CN107819326A (en) * | 2016-09-12 | 2018-03-20 | 天津大学 | A kind of new superconductive direct current limiter |
| CN108767833A (en) * | 2018-07-27 | 2018-11-06 | 国电南瑞科技股份有限公司 | Single-phase magneto-restrictive fault current limiter |
| CN110311364A (en) * | 2019-06-18 | 2019-10-08 | 全球能源互联网欧洲研究院 | A kind of direct fault current limiter and DC transmission system |
| CN110311364B (en) * | 2019-06-18 | 2021-07-23 | 全球能源互联网欧洲研究院 | Direct current fault current limiter and direct current transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1295729C (en) | 2007-01-17 |
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Granted publication date: 20070117 |