CN2731803Y - D.C. superconductive fault current limiter - Google Patents
D.C. superconductive fault current limiter Download PDFInfo
- Publication number
- CN2731803Y CN2731803Y CN 200420065026 CN200420065026U CN2731803Y CN 2731803 Y CN2731803 Y CN 2731803Y CN 200420065026 CN200420065026 CN 200420065026 CN 200420065026 U CN200420065026 U CN 200420065026U CN 2731803 Y CN2731803 Y CN 2731803Y
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- coil
- superconductive
- utility
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Abstract
The utility model provides a direct current superconductive fault current limiter. The structure of the utility model is that two superconductive coupling coils W1 and W2 having the same inductance are wound on the annular iron core, wherein, one superconductive coupling coils W1 is used as a limiting coil, and both ends of the superconductive coupling coils W1 are connected to a load loop. The other superconductive coupling coils W2 is used as an off-set coil, and is connected in series with a direct current power supply E2 and a resistor R2 . The coupling coil W1 and W2 are cooled by a cooling device. The utility model has advantages of obvious limiting effect, extremely low operation loss, short response time, height reliability, very small energy stored by the superconductive coil when the system is in normal operation, without generating overvoltage after the fault is protected, integrating the detecting, the triggering, and the limiting, without needing the additional control circuit, simple structure, and smaller volume. So the utility model can satisfy the requirements to the direct current fault protection of the independent systems of the vessels, the airplanes, the petroleum drilling platforms, the mobile communication stations, the electric automobiles, etc.
Description
Technical field
The utility model 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 purpose of this utility model is to overcome above-mentioned existing dc circuit breaker reaction time length and produces superpotential shortcoming, and 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 adopted in the utility model 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.
Advantage of the present utility model is:
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 utility model in direct current system.
Fig. 2 is the structural representation of a kind of embodiment of the utility model.
Fig. 3 is the structural representation of a kind of cooling device in the utility model.
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 utility model 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 utility model 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 utility model 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 utility model, 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 |
|---|---|---|---|
| CN 200420065026 CN2731803Y (en) | 2004-06-23 | 2004-06-23 | D.C. superconductive fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420065026 CN2731803Y (en) | 2004-06-23 | 2004-06-23 | D.C. superconductive fault current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2731803Y true CN2731803Y (en) | 2005-10-05 |
Family
ID=35052117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420065026 Expired - Lifetime CN2731803Y (en) | 2004-06-23 | 2004-06-23 | D.C. superconductive fault current limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2731803Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295729C (en) * | 2004-06-23 | 2007-01-17 | 华中科技大学 | DC superconducting fault current limiter |
| CN101741074B (en) * | 2008-11-12 | 2012-11-14 | 苏俊连 | Ship electricity fault current restrictor |
| CN112531665A (en) * | 2020-11-17 | 2021-03-19 | 中国电建集团华东勘测设计研究院有限公司 | Iron core-based hybrid high-temperature superconducting direct current fault current limiter and fault processing method |
-
2004
- 2004-06-23 CN CN 200420065026 patent/CN2731803Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295729C (en) * | 2004-06-23 | 2007-01-17 | 华中科技大学 | DC superconducting fault current limiter |
| CN101741074B (en) * | 2008-11-12 | 2012-11-14 | 苏俊连 | Ship electricity fault current restrictor |
| CN112531665A (en) * | 2020-11-17 | 2021-03-19 | 中国电建集团华东勘测设计研究院有限公司 | Iron core-based hybrid high-temperature superconducting direct current fault current limiter and fault processing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20040623 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |