CN102751710A - Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter - Google Patents
Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter Download PDFInfo
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Abstract
The invention discloses a novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter. The fault current limiter comprises an air-core transformer provided with a high temperature superconducting magnetic shielding barrel or winding, a rectifier bridge circuit and a direct current inductor. Compared with fault current limiters in prior art, the fault current limiter has the advantages that the size is small, the structure is compact, during a normal operation, due to a magnetic shielding effect of the superconducting magnetic shielding barrel, the impedance is extremely low, the influence of the impedance on a system can be completely ignored, when a fault happens, an automatic response is achieved, a high current-limiting impedance is inserted to limit the current rapidly, restoring time is short, and the improvement of system dynamic stability is facilitated.
Description
Technical field
The present invention relates to a kind of fault current limiter that is used for electric power system, especially a kind of novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter.
Background technology
Continuous expansion and the interconnected development of electrical network along with the electric power system scale; Short circuit current level constantly increases in the electrical network; Constantly the short trouble of upgrading causes more and more serious destruction to electric equipment in the electrical network; Simultaneously also surpassed the breaking capacity that plays the circuit breaker of error protection effect in the power circuit gradually, system's security of operation has been caused serious threat.For guaranteeing system's security of operation, need improve constantly the capacity of electric equipments such as transformer in the system, generator, circuit breaker, bus, cause the continuous increase of volume, weight and the cost of electric equipment in the system.For effective limiting short-circuit current, guarantee system safety operation, effectively reduce the system equipment investment simultaneously, each research institution has successively released various types of short circuit current limiters both at home and abroad.General, there is following requirement in system to flow restricter: after hanging net, and Low ESR or zero impedance when normally moving; Its current-limiting impedance can be limited in short circuit current limitation within the preset value during failure current limit, and fault responds the insertion system current limliting when taking place fast; Do not influence the normal operation of system behind the faults itself; Volume is little, and is in light weight, and cost is low.
In all kinds of short circuit current limiters, of greatest concern, what have application prospect most is two types of flow restricters: superconductive current limiter and solid-state current limiter.Whether superconductive current limiter utilizes the quench characteristic of superconductor to be divided into not quench type and quench type two big classes in the current limliting process according to it.More not representational in the lost super conductive flow restricter is active saturation type superconductive current limiter, and as shown in Figure 1, it discharges the loop by iron core, AC Windings, DC superconducting winding, DC power supply, magnetic energy and control circuit is formed.In normal through-flow attitude, the direct current magnetic potential makes core depth saturated, and the AC Windings that seals in transmission line presents low induction reactance, so the two ends pressure drop is very little, has no adverse effect for normal transmission of electricity; After short trouble takes place; Current surge; Supervisory control system perception fault is immediately also cut off the DC excitation electric current by means of the electronic power switch in the DC control circuit (being made up of IGBT or IGCT), and the magnetic energy that stores in the direct current winding discharges the loop through magnetic energy and is released to zero, and two iron cores all break away from degree of depth saturation condition; Fault current all will produce big current limliting induced potential on two AC Windings, thereby will realize current limliting.Saturated core type superconductive current limiter mainly changes its impedance under normal operation and failure current limit state, Low ESR when realizing normal operation the, high impedance during failure current limit through the degree of saturation of direct current winding control iron core.When system short circuit capacity was big, saturated for iron core can not taken place, the AC Windings number of turn can not be too many, and area of core section needs enough greatly simultaneously, and to guarantee required current-limiting reactor value, this can significantly increase the volume and the cost of flow restricter undoubtedly.Flow restricter self can't be to fault from dynamic response in addition; Need the outer monitoring system to monitor the generation with failure judgement, this has proposed very high requirement to the reliability of monitoring system on the one hand, on the other hand; Make current limliting action have the time-delay of certain hour, reduced the current limitation effect of himself.
The lost super conductive flow restricter comprises transformer type, three-phase reactor type, resistor-type and shield type superconductive current limiter, and wherein the shield type superconductive current limiter has application prospect at present most.As shown in Figure 2, the shield type superconductive current limiter, by the copper coil in the outside, middle superconducting cylinder and inboard unshakable in one's determination coaxial being assembled, wherein copper coil is the current limliting winding, the series connection place in circuit.Normal operation period; Superconducting cylinder is a superconducting state, and the magnetic flux that copper coil produces will induce bucking current on the superconducting cylinder of short circuit, and the magnetic flux that is produced is offset the magnetic flux that copper coil produced; The impedance of device is only determined by the air-gap leakage flux between copper coil and superconducting tube, shows Low ESR.When failed because, superconducting cylinder increases to the critical value quench very soon because of the electric current of induction, and its resistance increases rapidly, and superconducting tube can not shield the magnetic flux of copper coil again, and the impedance of device increases, thereby fault current is provided constraints.Though the quench characteristic of shield type superconductive current limiter superconductor capable of using is made response and is dropped into current limliting fast fault automatically; But still equally there is under the high capacity of short circuit excessive problem unshakable in one's determination with saturated core type superconductive current limiter; The superconducting shielding tube needs long recovery time by the quench attitude to superconducting state in system failure excision back simultaneously, and this will cause certain influence to the dynamic stability of system.
Solid-state current limiter is made up of conventional reactor, electronic components and controller; Can constitute the different topology structure as required; Operating state through the control electronic components changes the equiva lent impedance of solid-state current limiter part, thereby reaches the purpose of limiting short-circuit current.Solid-state current limiter then has several types of GTO switching regulator, resonant mode, variableimpedance formula, hybrid, Bridge Type Solid State Current Limiter etc. at present.Solid-state current limiter has reliably, fast, advantage, particularly Bridge Type Solid State Current Limiter cheaply, operational mode that can be different according to system changes topological structure flexibly, and has fault from dynamic response, does not have the characteristics of the quick current limliting of time-delay.Chinese patent 02265208.6 disclosed short-circuit fault current limiter with by-pass inductor has proposed single-phase and two kinds of transformer coupled type Bridge Type Solid State Current Limiter with by-pass inductor of three-phase; Fig. 3 has provided its single-phase topological structure; Flow restricter is through coupling transformer TR1 connecting system; By-pass inductor Lp is connected in parallel on the former limit of coupling transformer; The single-phase rectification bridge of being made up of thyristor T1, T2, T3 and T4 is connected in parallel on coupling transformer TR1 secondary, and direct current current-limiting reactor Ld is connected in parallel on the dc output end of single-phase rectification bridge; Fig. 4 has provided the three-phase topological structure of this flow restricter; Flow restricter is through three-phase coupling transformer TR2 connecting system; Three by-pass inductor L6 are parallel to the every mutually former limit of three-phase coupling transformer; Coupling transformer TR2 secondary also connects the three-phase commutation bridge of being made up of thyristor T1, T2, T3, T4, T5, T6, and T7, T8 form the afterflow brachium pontis, and direct current current-limiting reactor Ld is connected to the dc output end of three-phase commutation bridge.For above-mentioned two kinds of topological structures, when normally moving, the secondary bridge circuit runs on the logical state of standard-sized sheet, and the transformer secondary is equivalent to short circuit, and the former limit of transformer only has its leakage reactance pressure drop to be series at system, and is very little to systematic influence.After system broke down, the reactance of transformer secondary direct current current-limiting did not have the insertion circuit current limliting of time-delay, effectively limiting short-circuit current primary peak and current-rising-rate thereof; When the monitoring system fast monitored and after judging fault, control secondary bridge circuit is out of service simultaneously, and the transformer secondary is equivalent to open circuit; Transformer is equivalent to an excitation reactance and seals in system; Because this transformer is a conventional transformer, excitation reactance is bigger, and short circuit current is limited by by-pass inductor fully.Coupling transformer in the above-mentioned fault current limiter; Must design according to system's rated capacity (rated voltage and rated current); Simultaneously do not influence system when ensureing normal operation and normally move, must increase the static exciter reactance as far as possible to increase the former secondary degree of coupling of transformer, with the pressure drop of reduction transformer primary leakage reactance; Can cause volume of transformer huge like this, limit applying of flow restricter.
For effectively overcoming the shortcoming of above-mentioned flow restricter; Chinese patent 200420022582.5 discloses a kind of novel electric power electric type short circuit current limiter; Like Fig. 5, shown in 6, conventional single-phase and three-phase transformer and by-pass inductor in the flow restricter that proposes in the patent 02265208.6 have been substituted with single-phase with the three-phase variable impedance transformer respectively.This flow restricter has not only saved by-pass inductor, and utilizes the excitation impedance of variable impedance transformer to come limiting short-circuit current fully, thus the static exciter reactance only need design according to the current limliting preset value, much smaller than the excitation reactance of conventional transformer.This flow restricter requires transformer core depth when short circuit current limitation saturated simultaneously; To reduce the degree of coupling of former secondary winding; Thereby effectively reduce the electric pressure of secondary bridge circuit thyristor, cross section of transformer core is long-pending for this reason can reduce significantly, and volume of transformer, weight and cost also can descend significantly.But should see that this variable impedance transformer is because when short circuit current limitation, core depth is saturated; Especially when short circuit current is excessive; Magnetic permeability unshakable in one's determination approaches air, in order to make the effective limiting short-circuit current of excitation reactance, must increase umber of turn and reach the required evaluation of current limliting to guarantee excitation reactance; This will increase the primary leakage reactance of transformer simultaneously, and normal operation brings certain influence to system.
Summary of the invention
The present invention is directed to the deficiency of prior art; Propose a kind of novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter, be divided into novel magnetic screen air-core transformer coupling single-phase topological structure of Bridge Type Solid State Current Limiter and novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter three-phase topological structure.
The single-phase topological structure of a kind of novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter comprises single-phase three winding air-core transformers, single-phase current limliting bridge circuit,
Described single-phase current limliting bridge circuit comprises single-phase rectification bridge and a direct current reactor; Single-phase rectification bridge is made up of four thyristors; Two thyristors of last brachium pontis are formed common cathode; Two thyristors of following brachium pontis are formed anode altogether, and direct current reactor is connected to the single-phase rectification bridge common cathode and is total between the anode;
Single-phase three winding air-core transformers, three cover coils are coaxially installed on skeleton, and middle and inboard winding is respectively a side winding and a secondary winding, and one time winding is serially connected with between system power supply and the load, secondary winding order phase current limliting bridge circuit, and outer coil is three windings;
Described three-phase multi winding transformer is every to be formed by the coaxial installation of multilayer winding, adopts the open-core type structure;
The shielding cylinder that described three windings are processed by high temperature superconducting materia constitutes.
A kind of novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter three-phase topological structure comprises three-phase three winding air-core transformers, three-phase current limliting bridge circuit,
Described three-phase current limliting bridge circuit comprises three-phase commutation bridge, afterflow brachium pontis and a direct current reactor; Three-phase commutation bridge is made up of six thyristors; Three thyristors of last brachium pontis are formed common cathode; Three thyristors of following brachium pontis are formed anode altogether, and the afterflow brachium pontis is made up of two thyristors along the polarity series connection, and direct current reactor is connected to the common cathode of three-phase commutation bridge jointly and is total between 2 on the anode simultaneously;
The every phase three cover coils of three-phase three winding air-core transformers are coaxially installed on skeleton; Middle and inboard winding is respectively a side winding and a secondary winding; Winding of three-phase is serially connected with between three-phase system power supply and the load, and the three-phase secondary winding connects three-phase current limliting bridge circuit, and outer coil is three windings;
Described three-phase multi winding transformer is every to be formed by the coaxial installation of multilayer winding, adopts the open-core type structure;
The shielding cylinder that described three windings are processed by high temperature superconducting materia constitutes.
U
sBe system power supply voltage, R
1And X
S1Be the resistance and the leakage inductance of a winding of transformer, R
2 '=n
12 2R
2, X
S2 '=n
12 2X
S2, n
12Be the equivalent voltage no-load voltage ratio of first and second winding, R
2 'And X
S2 'Be respectively the resistance and the leakage inductance value of secondary winding reduction to primary side, R
3 '=n
13 2R
3And X
3 '=n
13 2X
3, n
13Be equivalent voltage no-load voltage ratio between one, three winding, R
3 'And X
3 'Be the resistance and the leakage inductance of three winding reduction to primary sides, X
mBe the excitation reactance of transformer, Z
LBe load impedance.When system normally moves, because superconducting tube is in superconducting state, according to the zero resistance characteristic and the complete diamagnetic characteristic of superconductor, R
3 'And X
3 'All can be considered zero, this moment, the flow restricter impedance was fully by a winding resistance R
1And leakage reactance X
S1Decision, because the secondary winding of " short circuit " and superconducting tube be respectively to the flux shield effect in the interior outside of a winding, X
S1≈ 0, and the flow restricter impedance is then only by R
1Decide, its value is very little, can ignore fully, so system when normally moving the flow restricter pressure drop also can ignore fully.After system's failed because, superconducting tube quench, resistance R
3 'And X
3 'Increase rapidly, secondary winding is opened a way in half cycle after fault, and two, three windings lose a winding magnetic screening action, X afterwards
S1Increase rapidly, at this moment the current-limiting impedance Z of flow restricter
LimitThen mainly by X
S1, X
m, R
3 'And X
3 'X is got in common decision in the design
m>>R
3 ', X
3 ', Z then
Limit≈ X
S1+ X
m, promptly current-limiting impedance is determined by a winding reactance fully, therefore can reach system's current limliting preset value through the size and the number of turn that designs a winding.
Beneficial effect of the present invention:
Pressure drop is extremely low when 1, normally moving, and system is not almost had influence;
When 2, fault takes place from dynamic response, and current limliting fast;
3, behind the failure removal, recovery time is shorter, can switch to normal state by the current limliting attitude rapidly, helps the raising of power system dynamic stability property;
4, transformer adopting hollow-core construction all can not take place saturatedly between age at failure, do not have the spike that produces because of magnetic saturation, and the secondary side electric pressure is lower.
5, compact conformation, volume is little.
Description of drawings
Fig. 1 is the saturation type superconductive current limiter initiatively;
Fig. 2 is the shield type superconductive current limiter;
Fig. 3 is the single-phase topological structure of transformer coupled type Bridge Type Solid State Current Limiter with by-pass inductor;
Fig. 4 is the transformer coupled type Bridge Type Solid State Current Limiter three-phase topological structure with by-pass inductor;
Fig. 5 is the single-phase topological structure of novel electric power electric type short circuit current limiter;
Fig. 6 is a novel electric power electric type short circuit current limiter three-phase topological structure;
Fig. 7 is the single-phase topological structure of the novel magnetic screen air-core transformer coupling solid-state current limliting of bridge-type;
Fig. 8 is the solid-state current limliting three-phase of a novel magnetic screen air-core transformer coupling bridge-type topological structure;
Fig. 9 is the hollow single-phase three-winding transformer of novel magnetic screen;
Figure 10 is novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter equivalent electric circuit.
Embodiment
Like Fig. 7, shown in Figure 9, the single-phase topological structure of a kind of novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter comprises single-phase three winding air-core transformers, single-phase current limliting bridge circuit,
Single-phase current limliting bridge circuit comprises single-phase rectification bridge and a direct current reactor; Single-phase rectification bridge is made up of four thyristors; Two thyristors of last brachium pontis are formed common cathode, and two thyristors of following brachium pontis are formed anode altogether, and direct current reactor is connected to the single-phase rectification bridge common cathode and is total between the anode;
Single-phase three winding air-core transformers, three cover coils are coaxially installed on skeleton, and middle and inboard winding is respectively a side winding and a secondary winding, and one time winding is serially connected with between system power supply and the load, secondary winding order phase current limliting bridge circuit, and outer coil is three windings;
The three-phase multi winding transformer is every to be formed by the coaxial installation of multilayer winding, adopts the open-core type structure;
The shielding cylinder that three windings are processed by high temperature superconducting materia constitutes.
Like Fig. 8, shown in Figure 9, a kind of novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter three-phase topological structure comprises three-phase three winding air-core transformers, three-phase current limliting bridge circuit,
Described three-phase current limliting bridge circuit comprises three-phase commutation bridge, afterflow brachium pontis and a direct current reactor; Three-phase commutation bridge is made up of six thyristors; Three thyristors of last brachium pontis are formed common cathode; Three thyristors of following brachium pontis are formed anode altogether, and the afterflow brachium pontis is made up of two thyristors along the polarity series connection, and direct current reactor is connected to the common cathode of three-phase commutation bridge jointly and is total between 2 on the anode simultaneously;
The every phase three cover coils of three-phase three winding air-core transformers are coaxially installed on skeleton; Middle and inboard winding is respectively a side winding and a secondary winding; Winding of three-phase is serially connected with between three-phase system power supply and the load, and the three-phase secondary winding connects three-phase current limliting bridge circuit, and outer coil is three windings;
Described three-phase multi winding transformer is every to be formed by the coaxial installation of multilayer winding, adopts the open-core type structure;
The shielding cylinder that described three windings are processed by high temperature superconducting materia constitutes.
Novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter, when normal operation, the rectifier bridge standard-sized sheet is logical; Dc inductance is through the afterflow of afterflow brachium pontis, and the voltage drop of dc inductance is the conduction voltage drop of afterflow brachium pontis, approaches zero; Whole bridge circuit approaches the equipotential state; Gu the coupling transformer secondary side can equivalence be " short circuit ", at this moment, the first side winding pressure drop that is serially connected with system is merely the leakage reactance pressure drop.Secondary winding is because " short circuit ", and it is used that magnetic flux (being the magnetic flux that interlinkage is crossed first and second winding) has shielding to external world, but can't form shielding to a winding leakage flux, and this leakage field comprises winding outside leakage field and inboard leakage field.The inboard leakage field of winding is owing to can only pass through the gap of first and second winding, and its value is very little, can ignore, and this moment, a winding leakage reactance was then mainly determined by outside leakage flux.According to the law of magnetic circuit, the winding leakage reactance and the number of turn square proportional, a winding causes the leakage reactance pressure drop to increase because itself be that the current limliting winding needs enough numbers of turn satisfy the current limliting requirement.For effectively reducing a winding leakage reactance, then need effectively suppress the outside leakage field of a winding, this can be through realizing at a winding outside coaxial installation shielding winding.The shielding winding adopts high-temperature superconductor shielding cylinder or winding, its inner dead short circuit among the present invention.When system normally moved, the superconducting tube induced currents was less than its critical current I
c, superconducting tube is in superconducting state, according to the Meisser effect of superconductor; Magnetic flux is got rid of external fully in the superconductor; Internal magnetic field is zero, and superconductor has the perfect diamganetism characteristic, and this moment, the transformer outside leakage flux overwhelming majority that a time winding produced was shielded by superconducting tube.To sum up, when system normally moves because the secondary winding of transformer " short circuit " and high-temperature superconductor tube or the magnetic field shielding effect of winding, the leakage reactance pressure drop of a winding is limited in very low level, the flow restricter pressure drop can be ignored basically.After system's failed because; Because short circuit current moment increase; The dc inductance of Circuit Fault on Secondary Transformer does not have peak value and the climbing thereof that time-delay is inserted into bridge circuit limiting short-circuit current first ripple automatically, after monitoring system detects system and breaks down, blocks the bridge circuit trigger impulse rapidly; Bridge circuit can turn-off in half cycle fully, and secondary winding is equivalent to open circuit; Simultaneously, the induced current moment increase in the transformer superconducting shielding tube, and surpass critical current I
c, the automatic quench of superconducting tube loses magnetic screen and does effect.Like this; Two, three windings of transformer all lose magnetic screening action automatically after fault takes place; The winding reactance value of transformer that is serially connected with system's major loop increases rapidly, and transformer then can be equivalent to air core reactor, effectively limiting short-circuit current peak value and climbing thereof.
After system's failed because; The all or part of system power supply voltage of bearing of winding of transformer; If the high magnetic conductive iron structure of transformer adopting has higher coupling coefficient between first and second winding, secondary side voltage is higher; The secondary side bridge circuit must have corresponding voltage withstand class, to guarantee its safe operation.The electric pressure of secondary winding when reducing the system failure, can make in the design first and second umber of turn than n greater than 1, but the n that then increase to a winding through the secondary winding electric current this moment is doubly, this can increase the capacity of thyristor again.Transformer adopting hollow-core construction among the present invention, the main magnetic circuit magnetic permeability approaches air permeability, and far below the magnetic permeability of ferromagnetic material, the degree of coupling of such first and second winding is far below core construction.If first and second umber of turn ratio is 1:1, but its equivalent no-load voltage ratio then is n
': 1 (n
'>1, general, 1.5<n
'<2.5); After system's failed because, secondary side voltage is far below primary side voltage, and because transformer magnetic circuit all can not take place saturated between whole age at failure; Secondary side voltage has the good linearity between age at failure, do not have the spike that produces because of magnetic saturation.
After the system failure was eliminated, flow restricter should return to normal operating conditions rapidly by the failure current limit attitude, and the length of recovery time then directly has influence on the dynamic stability performance of system.The disclosed flow restricter scheme of the present invention after control system monitors system failure excision, is sent the bridge circuit trigger impulse rapidly, opens the secondary side bridge circuit, if bridge circuit is opened moment dc inductance L
dStill storage residue magnetic energy, and residual current is greater than the peak I of line current
m, then bridge circuit is opened moment and is got into the logical state of standard-sized sheet immediately, and secondary side equivalence immediately is " short circuit ".If bridge circuit is opened moment, dc inductance L
dResidual current be lower than I
m, or decayed to zero, and need one section transient process that dc inductance is magnetized after then bridge circuit is opened, after direct current reached steady-state value, the bridge circuit standard-sized sheet was logical, process is comparatively of short duration but this magnetizes, and only needs 2 to 3 cycles.To sum up, the transformer secondary winding can return to the logical operate as normal attitude of standard-sized sheet by the fault open-circuit condition rapidly, and realizes the magnetic screen to a winding.With respect to secondary winding; The superconducting shielding tube in the transformer outside is then longer to the recovery time of normal superconducting state by fault quench attitude; Be after the transformer secondary winding returns to " short circuit " attitude by " open circuit "; Still there is the quench attitude of a period of time in the superconducting shielding tube, to the unshielded effect of a winding outside magnetic flux.But this moment, the first side winding main flux was by the secondary winding shielding, and the pressure drop of winding leakage reactance can be limited in the scope that system allows fully, and the dynamic stability of system is had no adverse effect.
When system normally moves, if the secondary side bridge circuit breaks down and breaks off, but since the flux shield effect of outside superconducting shielding tube, the level that the flow restricter pressure drop still can be limited in reducing, less to the normal influence on system operation of system.
Shown in figure 10, U
sBe system power supply voltage, R
1And X
S1Be the resistance and the leakage inductance of a winding of transformer, R
2 '=n
12 2R
2, X
S2 '=n
12 2X
S2, n
12Be the equivalent voltage no-load voltage ratio of first and second winding, R
2 'And X
S2 'Be respectively the resistance and the leakage inductance value of secondary winding reduction to primary side, R
3 '=n
13 2R
3And X
3 '=n
13 2X
3, n
13Be equivalent voltage no-load voltage ratio between one, three winding, R
3 'And X
3 'Be the resistance and the leakage inductance of three winding reduction to primary sides, X
mBe the excitation reactance of transformer, Z
LBe load impedance.When system normally moves, because superconducting tube is in superconducting state, according to the zero resistance characteristic and the complete diamagnetic characteristic of superconductor, R
3 'And X
3 'All can be considered zero, this moment, the flow restricter impedance was fully by a winding resistance R
1And leakage reactance X
S1Decision, because the secondary winding of " short circuit " and superconducting tube be respectively to the flux shield effect in the interior outside of a winding, X
S1≈ 0, and the flow restricter impedance is then only by R
1Decide, its value is very little, can ignore fully, so system when normally moving the flow restricter pressure drop also can ignore fully.After system's failed because, superconducting tube quench, resistance R
3 'And X
3 'Increase rapidly, secondary winding is opened a way in half cycle after fault, and two, three windings lose a winding magnetic screening action, X afterwards
S1Increase rapidly, at this moment the current-limiting impedance Z of flow restricter
LimitThen mainly by X
S1, X
m, R
3 'And X
3 'X is got in common decision in the design
m>>R
3 ', X
3 ', Z then
Limit≈ X
S1+ X
m, promptly current-limiting impedance is determined by a winding reactance fully, therefore can reach system's current limliting preset value through the size and the number of turn that designs a winding.
Claims (2)
1. a novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter comprises single-phase three winding air-core transformers, single-phase current limliting bridge circuit,
Described single-phase current limliting bridge circuit comprises single-phase rectification bridge and a direct current reactor; Single-phase rectification bridge is made up of four thyristors; Two thyristors of last brachium pontis are formed common cathode; Two thyristors of following brachium pontis are formed anode altogether, and direct current reactor is connected to the single-phase rectification bridge common cathode and is total between the anode;
It is characterized in that: single-phase three winding air-core transformers, three cover coils are coaxially installed on skeleton; Middle and inboard winding is respectively a side winding and a secondary winding; One time winding is serially connected with between system power supply and the load, secondary winding order phase current limliting bridge circuit, and outer coil is three windings;
Described three-phase multi winding transformer is every to be formed by the coaxial installation of multilayer winding, adopts the open-core type structure;
The shielding cylinder that described three windings are processed by high temperature superconducting materia constitutes.
2. a novel magnetic screen air-core transformer coupling Bridge Type Solid State Current Limiter comprises three-phase three winding air-core transformers, three-phase current limliting bridge circuit,
Described three-phase current limliting bridge circuit comprises three-phase commutation bridge, afterflow brachium pontis and a direct current reactor; Three-phase commutation bridge is made up of six thyristors; Three thyristors of last brachium pontis are formed common cathode; Three thyristors of following brachium pontis are formed anode altogether, and the afterflow brachium pontis is made up of two thyristors along the polarity series connection, and direct current reactor is connected to the common cathode of three-phase commutation bridge jointly and is total between 2 on the anode simultaneously;
It is characterized in that: the every phase three cover coils of three-phase three winding air-core transformers are coaxially installed on skeleton; Middle and inboard winding is respectively a side winding and a secondary winding; Winding of three-phase is serially connected with between three-phase system power supply and the load; The three-phase secondary winding connects three-phase current limliting bridge circuit, and outer coil is three windings;
Described three-phase multi winding transformer is every to be formed by the coaxial installation of multilayer winding, adopts the open-core type structure;
The shielding cylinder that described three windings are processed by high temperature superconducting materia constitutes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203729170U CN202840498U (en) | 2012-07-30 | 2012-07-30 | Novel magnetic-shielding air core transformer coupling bridge type solid-state current limiter |
| CN201210266746.8A CN102751710B (en) | 2012-07-30 | 2012-07-30 | Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203729170U CN202840498U (en) | 2012-07-30 | 2012-07-30 | Novel magnetic-shielding air core transformer coupling bridge type solid-state current limiter |
| CN201210266746.8A CN102751710B (en) | 2012-07-30 | 2012-07-30 | Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102751710A true CN102751710A (en) | 2012-10-24 |
| CN102751710B CN102751710B (en) | 2015-01-28 |
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| CN2012203729170U Expired - Lifetime CN202840498U (en) | 2012-07-30 | 2012-07-30 | Novel magnetic-shielding air core transformer coupling bridge type solid-state current limiter |
| CN201210266746.8A Active CN102751710B (en) | 2012-07-30 | 2012-07-30 | Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter |
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| CN2012203729170U Expired - Lifetime CN202840498U (en) | 2012-07-30 | 2012-07-30 | Novel magnetic-shielding air core transformer coupling bridge type solid-state current limiter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305369A (en) * | 2015-11-10 | 2016-02-03 | 中电普瑞科技有限公司 | Thyristor-based solid state fault current limiter |
| CN105449653A (en) * | 2015-12-24 | 2016-03-30 | 章则明 | Device for automatically restricting short circuit fault current in alternating current power grid |
| 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 |
| CN113363950A (en) * | 2021-05-21 | 2021-09-07 | 长沙理工大学 | Flexible grounding method for power distribution network through transformer |
| CN114844072A (en) * | 2022-05-18 | 2022-08-02 | 华北电力大学 | Wind energy system based on superconducting energy storage-composite current limiter and working method thereof |
| CN114974795A (en) * | 2022-04-14 | 2022-08-30 | 西安交通大学 | Variable-impedance superconducting current-limiting transformer and working method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202840498U (en) * | 2012-07-30 | 2013-03-27 | 浙江大学 | Novel magnetic-shielding air core transformer coupling bridge type solid-state current limiter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04112620A (en) * | 1990-08-30 | 1992-04-14 | Agency Of Ind Science & Technol | Current limiter |
| CN101599346A (en) * | 2009-04-15 | 2009-12-09 | 江苏华鹏变压器有限公司 | A kind of low-loss high-impedance electric power transformer |
| CN102064542A (en) * | 2010-12-14 | 2011-05-18 | 东南大学 | Impedance composite superconducting fault current limiter based on novel superconducting material |
| CN202840498U (en) * | 2012-07-30 | 2013-03-27 | 浙江大学 | Novel magnetic-shielding air core transformer coupling bridge type solid-state current limiter |
-
2012
- 2012-07-30 CN CN2012203729170U patent/CN202840498U/en not_active Expired - Lifetime
- 2012-07-30 CN CN201210266746.8A patent/CN102751710B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04112620A (en) * | 1990-08-30 | 1992-04-14 | Agency Of Ind Science & Technol | Current limiter |
| CN101599346A (en) * | 2009-04-15 | 2009-12-09 | 江苏华鹏变压器有限公司 | A kind of low-loss high-impedance electric power transformer |
| CN102064542A (en) * | 2010-12-14 | 2011-05-18 | 东南大学 | Impedance composite superconducting fault current limiter based on novel superconducting material |
| CN202840498U (en) * | 2012-07-30 | 2013-03-27 | 浙江大学 | Novel magnetic-shielding air core transformer coupling bridge type solid-state current limiter |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305369A (en) * | 2015-11-10 | 2016-02-03 | 中电普瑞科技有限公司 | Thyristor-based solid state fault current limiter |
| CN105305369B (en) * | 2015-11-10 | 2019-11-08 | 中电普瑞科技有限公司 | A kind of solid-state fault current limiter based on thyristor |
| CN105449653A (en) * | 2015-12-24 | 2016-03-30 | 章则明 | Device for automatically restricting short circuit fault current in alternating current power grid |
| CN105449653B (en) * | 2015-12-24 | 2018-01-09 | 章则明 | The device of volitional check short-circuit current in a kind of AC network |
| 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 |
| CN113363950A (en) * | 2021-05-21 | 2021-09-07 | 长沙理工大学 | Flexible grounding method for power distribution network through transformer |
| CN114974795A (en) * | 2022-04-14 | 2022-08-30 | 西安交通大学 | Variable-impedance superconducting current-limiting transformer and working method thereof |
| CN114844072A (en) * | 2022-05-18 | 2022-08-02 | 华北电力大学 | Wind energy system based on superconducting energy storage-composite current limiter and working method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN202840498U (en) | 2013-03-27 |
| CN102751710B (en) | 2015-01-28 |
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