CN201130845Y - Shunt inductance current-limiting breaker - Google Patents
Shunt inductance current-limiting breaker Download PDFInfo
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- CN201130845Y CN201130845Y CNU2007200888988U CN200720088898U CN201130845Y CN 201130845 Y CN201130845 Y CN 201130845Y CN U2007200888988 U CNU2007200888988 U CN U2007200888988U CN 200720088898 U CN200720088898 U CN 200720088898U CN 201130845 Y CN201130845 Y CN 201130845Y
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- circuit breaker
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- shunt inductance
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Abstract
The utility model relates to a shunt inductance current-limiting circuit breaker, belonging to a protection unit for power system short circuit fault, in particular to a large-capacity short circuit fault protector, which aims to overcome the defects of breaking capacity of the circuit breakers in the prior art, improve the breaking capacity, and effectively cut off the fault current. The shunt inductance current-limiting circuit breaker comprises two shunt coils, two protective resistors, an auxiliary circuit breaker and a main circuit breaker, which is characterized in that the different terminals of a first coil and a second coil are connected; the coupling coefficient is 1; the first coil is connected in parallel with a first protective resistor, and then connected in series with the auxiliary circuit breaker; the second coil is connected in parallel with a second protective resistor, and then connected in series with the main circuit breaker; the complete device is connected in series in to a host system; when the control circuit sends control signal when the short circuit fault of the host system is detected, so as to switch on the auxiliary circuit breaker and decouple the shunt inductance to limit the fault current at certain level, and then switch on the main circuit breaker to completely cut off the fault current. The shunt inductance current-limiting circuit breaker has the advantages of low loss and running cost, and ability to obviously improve the breaking capacity of the circuit breaker and effectively cut off the fault current.
Description
Technical field
The utility model belongs to the short-circuit fault of power system protective device, and particularly a kind of big capacity short trouble protection device to improve the connecting-disconnecting function of circuit breaker, guarantees its disengagement failure electric current effectively.
Background technology
Along with technology and expanding economy, just by self dilatation and internet interconnected continuous expansion scale, the power system capacity and the short circuit current of transmission and distribution networks increase thereupon in electric power system.Short circuit current increases, and the negative effect that brings to system and user increases, and is also just high more to the requirement of electric and the thermally-stabilised parameter of power equipment; Capacity of short circuit increases also may cause circuit breaker cutting-off of short-circuit electric current timely and effectively, thereby power equipment is caused harmful effect.Therefore, for guaranteeing power system security, reliable and stable operation, must take effective measures the level of limiting short-circuit current, to guarantee circuit breaker disengagement failure electric current effectively.At present, the measure of restriction Power System Shortcuts electric current mainly contains:
(1) promotes the line voltage grade, with the layering of next stage electrical network, partition running.The low-voltage hierarchical network is divided into several regions, and in the more higher leveled electrical network of radial access, jumbo power plant directly inserts in the higher one-level electrical network, and like this, the short circuit current of primary voltage hierarchical network will decrease.This measure can effectively suppress system short circuit capacity, but the network of building a high step voltage not only the engineering complexity, involve great expense, reduced power supply reliability and operational flexibility, also can bring problems such as electromagnetic pollution.
(2) many buses fanout operation or bus section operation.This measure can reduce capacity of short circuit greatly, the level of limiting short-circuit current significantly, but reduced power supply reliability, increased line loss, be not the trend of power network development, generally do not adopt this mode at 220KV and above high voltage network.
(3) adopt the Fuse Type protector.This measure is played positive role to cutting-off of short-circuit electric current, but its reaction speed is slower, is unfavorable for the stable state and the transient stability of electrical network, and to electrical network moment electric power without any inhibitory action; In addition, the Fuse Type protector generally is disposable, makes troubles for the maintenance and the automation of electrical network.
(4) adopt large capcity breaker.From modern power systems and technical development thereof, there is certain limitation in this scheme.On the one hand, there is suitable difficulty technically in the vast capacity circuit breaker; On the other hand, system short-circuit electric current and breaker apparatus rupturing capacity too conference increase the weight of the specification requirement of equipment in parallel, are uneconomic.
(5) adopt current limiting reactor.In superhigh pressure, long distance transmission line, the installing series reactor is used morely, and this has equaled to increase the distance of transmission line, increases impedance, thus the limiting short-circuit current level; In addition, this measure has compensated the influence of line capacitance electric current, has improved the voltage levvl of line end effectively.But this measure meeting increases the stability of network loss, the operation of reduction system.
In addition, also have the off-the-line electrical network, adopt direct current transportation technology (BTB back-to-back), the measures such as impedance that increase equipment such as generator, transformer are by changing network configuration or parameter and reduce short circuit current level.Above measure is in the level that has limited short circuit current in varying degrees, but they all exist separately defective and deficiency, or with another kind of form electrical network has been produced adverse effect, or technical realization difficulty (large capcity breaker).For this reason, people have proposed the notion of fault current limiter, this scheme does not change the network parameter under operational mode, network configuration and the normal operating condition of system, can satisfy the requirement that system short circuit capacity constantly increases, and can cut off jumbo fault current effectively.For this reason, people have launched number of research projects to it.
Summary of the invention
The utility model provides a kind of shunt inductance current-limiting breaker, and purpose is to overcome the deficiency of existing breaking capacity of breaker, improves its connecting-disconnecting function, is effective ground disengagement failure electric current.
A kind of shunt inductance current-limiting breaker of the present utility model comprises it is characterized in that coil, the protective resistance with coils from parallel connection of coils, the auxiliary circuit breaker of connecting with coil and the main circuit breaker of two parallel connections:
Described first coil links to each other with the different name end of second coil, and two coils from parallel connection of coils, coupling coefficient are 1; First coil is in parallel with first protective resistance, connects with auxiliary circuit breaker again; Second coil is in parallel with second protective resistance, connects with main circuit breaker again; Main system is gone in whole device series connection, when control loop detects main system and is short-circuited fault, sends control signal, open auxiliary circuit breaker earlier, the shunt inductance decoupling zero, fault current is limited in certain level, open main circuit breaker again, fully the disengagement failure electric current.
Described shunt inductance current-limiting breaker is characterized in that: first coil of described parallel connection and second coil method are superconductor.
Described shunt inductance current-limiting breaker is characterized in that: described main circuit breaker or auxiliary circuit breaker are electronic power switch or PWM current transformer.
The utility model utilizes the shunting of noninductive coupling shunt inductance to reduce the capacity that cut-offs of auxiliary circuit breaker, utilize current limliting after the shunt inductance decoupling zero to reduce the capacity that cut-offs of main circuit breaker, improve the connecting-disconnecting function of existing circuit breaker, made it to cut off big capacity short circuit current.When system normally moved, the parallel inductor that the different name end links to each other made device be in low-loss armed state by noninductive coupling, and system power is shared jointly by parallel inductor; When system is short-circuited fault, the shunting of shunt inductance has reduced the capacity that cut-offs of auxiliary circuit breaker, after auxiliary circuit breaker is opened, the shunt inductance decoupling zero, impedance increases greatly, fault current is effectively limited, and has reduced the capacity that cut-offs of main circuit breaker, thereby is effective ground disengagement failure electric current.In the utility model, auxiliary circuit breaker and main circuit breaker adopt timesharing to cut-off strategy, thereby have realized utilizing the shunting of noninductive coupling shunt inductance and the capacity that cut-offs that the current limliting after the decoupling zero reduces them respectively, improve its connecting-disconnecting function.The utility model loss is very low, and operating cost is little, can improve the connecting-disconnecting function of existing circuit breaker significantly, is effective ground disengagement failure electric current.
Description of drawings
Fig. 1 is applied to the circuit diagram (single-phase) of AC system for the utility model embodiment;
Fig. 2 is when using the utility model, line current i
sWith the auxiliary circuit breaker current i
1Waveform, abscissa are time (s), and ordinate is electric current (KA);
Fig. 3 is when using the utility model, line current i
sWith the main circuit breaker current i
2Waveform, abscissa is time (s), ordinate is electric current (KA);
Fig. 4 is when using the utility model, the voltage u of the first coil W1
W1Voltage u with the second coil W2
W2Waveform, abscissa are time (s), and ordinate is voltage (KV).
Embodiment
The utility model comprises the first coil W1 and the second coil W2, the first protective resistance R1 and the second protective resistance R2, auxiliary circuit breaker S1 and main circuit breaker S2 in parallel.Main system is gone in whole device series connection, and the parallel connection first coil W1 of noninductive coupling links to each other coupling coefficient with the different name end of the second coil W2
In the formula, M is mutual inductance, L
1Be the self-induction of the first coil W1, L
2It is the self-induction of the second coil W2.
System moves just often, and auxiliary circuit breaker S1 and main circuit breaker S2 all are in closure state, and the first coil W1 and the second coil W2 share line current (I jointly
s=I
1+ I
2), the equiva lent impedance that the shunt inductance of noninductive coupling presents is very little, is almost 0 (L
Eq=(L
1L
2-M
2)/(L
1+ L
2+ 2M) ≈ 0), so the landing of the voltage on the inductance is also just very little, whole device is in low-loss armed state.
When system is short-circuited fault, system power I
sSuddenly increase, before auxiliary circuit breaker S1 action, the first coil W1 of noninductive coupling and the second coil W2 remain and bear fault current jointly, but the shunting of shunt inductance has reduced the capacity that cut-offs of auxiliary circuit breaker S1, improved its connecting-disconnecting function, in auxiliary circuit breaker S1 action, after the first coil W1 of shunt inductance is cut-off, the shunt inductance decoupling zero, impedance increases greatly, reduce the capacity that cut-offs of main circuit breaker S2, improved its connecting-disconnecting function, thereby guaranteed its disengagement failure electric current effectively.The raising of auxiliary circuit breaker S1 connecting-disconnecting function is the shunting because of shunt inductance, and the raising of main circuit breaker S2 connecting-disconnecting function is because of the current limliting after the shunt inductance decoupling zero, and current limliting relies on time-sharing operation to realize.
Embodiment as shown in Figure 1, the relevant parameter of circuit is as follows:
Ideal source (110KV system):
Power frequency f=50Hz;
The self-induction of bridging coil: L
1=L
2=80.1mH;
The mutual inductance of bridging coil: M=80mH; Coupling coefficient k=0.9988;
Protective resistance R1 and R2:R1=R2=1000 Ω;
Transmission line impedance: Z
Line=R
Line+ jXl
Ine=2.26+j11.32 Ω;
Load apparent power: S
Load=50MW+j10Mvar.
Fig. 2～4 are depicted as the oscillogram that embodiment is applied to AC system, and for observing shunting and current limitation effect better, auxiliary circuit breaker S1 all has certain time-delay with the switch off time of main circuit breaker S2 with actual comparing at this.System is in normal operating condition before the fault, and during t=0.026s, system is in load end generation ground short circuit fault, and during t=0.076s, auxiliary circuit breaker S1 cut-offs, and during t=0.116s, main circuit breaker S2 cut-offs.
As shown in Figure 2, fine line is represented system power i
s, thick dashed line is represented the auxiliary circuit breaker current i
1When system normally moved, current peak was 1.08KA, during the short circuit, and instantaneous peak value up 16.3KA (the ≈ 16I of fault current
N, I
NRated current for circuit), if only use a circuit breaker to cut-off short circuit current, then the capacity that cut-offs of this circuit breaker needs at least greater than 16KA, and as seen from the figure, because the shunting action of shunt inductance, the electric current that flows through auxiliary circuit breaker S1 has only half of system short-circuit electric current, so the cut-offfing capacity and can reduce half of circuit breaker, its connecting-disconnecting function is significantly improved.
As shown in Figure 3, fine line is represented system power i
s, thick dashed line is represented the main circuit breaker current i
2Cut-off at auxiliary circuit breaker S1, before the shunt inductance decoupling zero, shunt inductance plays shunting action (i
s=i
1+ i
2), S1 cut-offs at auxiliary circuit breaker, and (t＞0.08s), the fault current of system is all born (i by main circuit breaker S2 after the shunt inductance decoupling zero
s=i
2), but because the decoupling zero of shunt inductance, the device impedance increases greatly, enters limited current state, and fault current is effectively reduced, and the peak value maximum has only 3.6KA (≈ 3.3I
N), so the cut-offfing capacity and can reduce greatly of main circuit breaker S2, its connecting-disconnecting function is significantly improved, thus can be effectively disengagement failure electric current fully.
Figure 4 shows that the voltage landing u at the first coil W1 in parallel and the second coil W2 two ends
W1With u
W2, as seen from the figure, before auxiliary circuit breaker S1 cut-off, because shunt inductance is in noninductive couple state, the landing of the voltage at its two ends was almost 0, so the loss of device is very low when system normally moves.After auxiliary circuit breaker S1 cut-offs, the shunt inductance decoupling zero, impedance increases, and the second coil W2 becomes the main impedance of system, so the landing of the voltage on the inductance approaches system voltage.U among the figure
W1With u
W2Always reverse, be because the different name end of bridging coil links to each other.
Claims (3)
1. shunt inductance current-limiting breaker comprises it is characterized in that coil, the protective resistance with coils from parallel connection of coils, the auxiliary circuit breaker of connecting with coil and the main circuit breaker of two parallel connections:
Described first coil links to each other with the different name end of second coil, and two coils from parallel connection of coils, coupling coefficient are 1; First coil is in parallel with first protective resistance, connects with auxiliary circuit breaker again; Second coil is in parallel with second protective resistance, connects with main circuit breaker again; Main system is gone in whole device series connection, when control loop detects main system and is short-circuited fault, sends control signal, open auxiliary circuit breaker earlier, the shunt inductance decoupling zero, fault current is limited in certain level, open main circuit breaker again, fully the disengagement failure electric current.
2. shunt inductance current-limiting breaker as claimed in claim 1 is characterized in that: first coil of described parallel connection and second coil method are superconductor.
3. shunt inductance current-limiting breaker as claimed in claim 1 or 2 is characterized in that: described main circuit breaker or auxiliary circuit breaker are electronic power switch or PWM current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200888988U CN201130845Y (en) | 2007-12-10 | 2007-12-10 | Shunt inductance current-limiting breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200888988U CN201130845Y (en) | 2007-12-10 | 2007-12-10 | Shunt inductance current-limiting breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201130845Y true CN201130845Y (en) | 2008-10-08 |
Family
ID=40018711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200888988U Expired - Lifetime CN201130845Y (en) | 2007-12-10 | 2007-12-10 | Shunt inductance current-limiting breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201130845Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183781B (en) * | 2007-12-10 | 2010-06-23 | 华中科技大学 | Shunt inductance current-limiting breaker |
| WO2013163853A1 (en) * | 2012-05-04 | 2013-11-07 | 中国科学院电工研究所 | Reactor-type short circuit fault current limiter |
| CN106159879A (en) * | 2016-08-26 | 2016-11-23 | 章则明 | A kind of combined mass circuit breaker system |
| CN107104423A (en) * | 2017-04-19 | 2017-08-29 | 中国科学院电工研究所 | One kind division reactance type direct current current-limiting circuit breaker |
| CN111628475A (en) * | 2020-06-01 | 2020-09-04 | 西安交通大学 | Solid-state direct current breaker based on coupling inductance |
-
2007
- 2007-12-10 CN CNU2007200888988U patent/CN201130845Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183781B (en) * | 2007-12-10 | 2010-06-23 | 华中科技大学 | Shunt inductance current-limiting breaker |
| WO2013163853A1 (en) * | 2012-05-04 | 2013-11-07 | 中国科学院电工研究所 | Reactor-type short circuit fault current limiter |
| CN106159879A (en) * | 2016-08-26 | 2016-11-23 | 章则明 | A kind of combined mass circuit breaker system |
| CN107104423A (en) * | 2017-04-19 | 2017-08-29 | 中国科学院电工研究所 | One kind division reactance type direct current current-limiting circuit breaker |
| CN111628475A (en) * | 2020-06-01 | 2020-09-04 | 西安交通大学 | Solid-state direct current breaker based on coupling inductance |
| CN111628475B (en) * | 2020-06-01 | 2021-05-28 | 西安交通大学 | Solid-state direct current breaker based on coupling inductance |
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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 |
Granted publication date: 20081008 Effective date of abandoning: 20071210 |