CN105262072A - Mixed type magnetic saturation fault current limiter - Google Patents
Mixed type magnetic saturation fault current limiter Download PDFInfo
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- CN105262072A CN105262072A CN201510811660.2A CN201510811660A CN105262072A CN 105262072 A CN105262072 A CN 105262072A CN 201510811660 A CN201510811660 A CN 201510811660A CN 105262072 A CN105262072 A CN 105262072A
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Abstract
The invention discloses a mixed type magnetic saturation fault current limiter. The current limiter comprises an iron core, coil windings, a direct current power supply and a current-limiting reactor. A permanent magnet and a direct current coil winding are jointly used as an excitation bias source, so that the demand on the direct current bias source is effectively reduced, the demagnetization risk of the permanent magnet is reduced, the reliability of an apparatus is improved, and the consumption and the cost of the apparatus are reduced as well; by adoption of a bridge type structure, the alternating current and the direct current can share the winding, so that the volume of the apparatus can be effectively reduced, and the consumption can be lowered at the same time; the fault current is limited by the current-limiting reactor in a direct current bias loop, so that the current-limiting effect is ensured, and the current-limiting level can be controlled as well; and four coil windings are serially connected through an ingenious connection manner, so that the current in each coil winding is reduced by half while the normal work of the fault current limiter is ensued, the consumption of the current limiter in the normal operation is reduced, and the reliability of the apparatus is improved.
Description
Technical field
The present invention relates to the equipment of high-voltage AC transmission net fault current limiting, relate in particular to the saturated fault current limiter of a kind of hybrid magnetic.
Background technology
Along with growing continuously and fast of China's industrial development, living standards of the people improve day by day, society's need for electricity constantly increases, the net capacity of electric power system also corresponding continuous increase to meet workload demand, bring system short circuit currents level constantly to increase thereupon, short-circuit current level even may bear current value by the maximum of overage existing device, and this causes serious threat to the safe operation of electric power system.Short-circuit fault current limiter is the visual plant of restriction short circuit malfunction electric current, when circuit normally runs, short-circuit fault current limiter does not have harmful effect to system, when breaking down, short-circuit fault current limiter can respond fast, the impedance that formation one is very large in short-circuit loop, effective limiting short-circuit current, ensures power grid security.
Along with the breakthrough of new material and new technology, the type of short-circuit fault current limiter also constantly increases, existing following several frequently seen fault current limiter type: solid-state fault current limiter, superconductive failure current limiter, ZnO arrester formula fault current limiter, saturated iron core fault current limiter.Solid-state fault current limiter needs to be realized by the connection in series-parallel of a large amount of power electronic device, and this causes its complex structure, and installation cost is high, and reliability is lower, and therefore actual use is very restricted; Superconductive failure current limiter, the requirement of application to maintenance technology of superconductor is high, and technology to realize cost high, these disadvantageous factors greatly limit the practical application of superconductive failure current limiter; The key technology of ZnO arrester formula fault current limiter is the energy-absorbing problem of parameter designing, cooperation and ZnO arrester, and therefore need a large amount of lightning arrester connection in series-parallel to use, this has difficulties in the realization of technology, and cost is high; Saturated iron core fault current limiter, it requires higher to DC excitation winding, needs enough DC magnetic kinetic potentials to be biased magnetic core, causes saturated iron core fault current limiter to there is the high problem of cost equally to the high request of DC offset voltage; Permanent magnetism saturation type fault current limiter can save direct current biasing source, without the need to additional control realization automatic switching, cheap, good economy performance, but the biased ability of permanent magnet material is generally not enough, cannot ensure iron core can the degree of depth saturated, when making normally to run, flow restricter resistance value is higher; And the stability of permanent magnet has problems, and short circuit current jumpy makes permanent magnet there is the risk of demagnetization, and device reliability is not high, application cannot be realized in the occasion of high-voltage large-capacity.
Admire at non-patent literature 1(Yuan Jia, " ANovelBridge-TypeHybridSaturatedCoreFaultCurrentLimiterB asedonPermanentMagnets ", IEEETransactiononmagnetics) structure of following a kind of flow restricter is disclosed in, as, comprise two hollow magnetic cores and coil windings, the structure of two square shape magnetic cores is identical, and two square shape magnetic cores are placed side by side, and permanent magnet is embedded in magnetic core and is biased iron core; Four coils are wrapped on the iron core of two hollow magnetic cores respectively, larger in the resistance value difference of core sataration and unsaturated state; Under permanent magnet bias, iron core is in saturation condition, and coil impedance value is lower, less to systematic influence; Under the comparatively major break down function of current, iron core in two hollow magnetic cores alternately exits saturated, the resistance value of the corresponding coil be wrapped on two magnetic cores alternately changes, the circulation path of alternating current in flow restricter winding changes, current-limiting reactor seals in ac circuit, limits fault current.But due to the large usage quantity of two hollow magnetic cores and corresponding required permanent magnet, cause it to be unsuitable for industrial mass production; The performance of structural parameters on device of magnetic core has larger impact, and document is not specifically addressed the selection of structural parameters.
Summary of the invention
For solving the quick response that should realize short trouble, effective fault current limiting, structure is simple again, reliability is high, also will reduce costs simultaneously, and applicable electric power system is applied widely, make the problem of power network safety operation, propose, using permanent magnet and DC coil winding together as excitation bias source, four coil windings to be passed through one connected mode connection in series-parallel cleverly together, connects into bridge architecture with the current-limiting reactor in direct current biasing loop.
The technical solution adopted in the present invention is: the saturated fault current limiter of a kind of hybrid magnetic, comprise iron core, coil windings, DC power supply and current-limiting reactor, described iron core comprises opening stem stem and lays respectively at first stem stem on the described opening stem stem left side, 3rd stem stem on the second stem stem and the right, four-limbed, the two ends up and down of described opening stem stem have upper horizontal yoke respectively, bottom rail yoke, the first permanent magnet is inlaid with in described horizontal yoke, 3rd permanent magnet, the second permanent magnet is inlaid with in described bottom rail yoke, 4th permanent magnet, described horizontal yoke two ends connect described first stem stem respectively, 3rd stem stem, described second stem stem is connected successively in the middle part of it, opening stem stem, four-limbed, described coil windings comprises the first coil, the second coil, tertiary coil, the 4th coil that are wound on respectively on described first stem stem, the second stem stem, the 3rd stem stem, four-limbed, one end of transmission line is accessed after described one end of first coil is connected with one end of tertiary coil, one end of described second coil is connected the rear other end accessing transmission line with one end of the 4th coil, the other end of described first coil is connected with the other end of the 4th coil, and the described other end of the second coil is connected with the other end of tertiary coil, described DC power supply and described current-limiting reactor are connected with the port of described first coil and the port of described tertiary coil after connecting.
Preferably, described iron core becomes axial symmetry about the center line of described opening stem stem.
Preferably, the centre of described opening stem stem has an air gap.
Preferably, described horizontal yoke left side central portion is inlaid with described first permanent magnet, and right side central is inlaid with described 3rd permanent magnet, and described bottom rail yoke left side central portion is inlaid with described second permanent magnet, and right side central is inlaid with described 4th permanent magnet; Described first permanent magnet and the second permanent magnet excitation direction in the iron core of left side is identical, and described 3rd permanent magnet is identical with the 4th permanent magnet excitation direction in the iron core of right side; First, second, third and fourth magnet size described is identical, and sectional area is equal with the sectional area of the horizontal yoke in respective place, and its length is greater than the gas length of described opening stem stem.
Preferably, described first stem stem, the second stem stem, the 3rd stem stem and four-limbed cross section are circle, ellipse or rectangle, and its sectional area is equal, and length is equal; Described opening stem stem cross section is circular, oval or rectangle, and sectional area is greater than the sectional area of described horizontal yoke; The length of described horizontal yoke, bottom rail yoke is equal, and sectional area is equal, and its sectional area is greater than the sectional area of described first stem stem, the second stem stem, the 3rd stem stem, four-limbed.
Preferably, the equal turn numbers of described first coil, the second coil, tertiary coil and the 4th coil.
Preferably, the reactance value of described current-limiting reactor is less than the induction reactance value of described winding coil when stem stem is unsaturated, and be greater than stem stem saturated time induction reactance value.
Operation principle of the present invention: be coil induction reactance is worth adjustable magnetic saturation type flow restricter to connect with transmission line, realize the restriction to short-circuit current.
Workflow of the present invention: the magnetic direction that the loop of direct current in coil induces is consistent with permanent magnet magnetic field direction, superposition forms bias magnetic field mutually; When circuit normally runs, at the positive half cycle of line current, first coil of left side iron core is consistent with bias magnetic field direction with the AC magnetic field direction that the second coil produces, under the bias in the magnetic field of superposition mutually, and the first stem stem and the equal penetration depth saturation condition of the second stem stem; The AC magnetic field direction that the tertiary coil of right side iron core and the 4th coil produce is contrary with bias magnetic field direction; But when circuit normally runs, the AC magnetic field that coil produces is less than bias magnetic field, and under the bias in the magnetic field of cancelling out each other, the 3rd stem stem and four-limbed are still in saturation condition.At the negative half period of line current, the AC magnetic field of left side iron core is contrary with bias magnetic field direction, and the AC magnetic field of right side iron core is identical with bias magnetic field direction, and the first stem stem, the second stem stem, the 3rd stem stem and four-limbed are still all in saturation condition; Therefore, when circuit be in normally work time, the resistance value that the coil windings of the saturated flow restricter of hybrid magnetic presents in transmission line is less, and the reactance value that coil presents is
l s , and alternating current does not flow through current-limiting reactor
l1, therefore voltage loss and energy loss less, on system cloud gray model impact very little.
When transmission line is short-circuited fault, fault current increases rapidly, and short circuit current
i f be greater than maximum load current.Therefore, the AC magnetic field that each coil produces will be greater than bias magnetic field; At the positive half cycle of short circuit current, the AC magnetic field that the first coil of left side iron core and the second coil produce increases, and direction is consistent with bias magnetic field direction, and the degree of saturation of the first stem stem, the second stem stem is deepened, the reactance value of the first coil, the second coil
l s still less; The AC magnetic field that the tertiary coil of right side iron core and the 4th coil produce also increases, the AC magnetic field produced due to coil is greater than bias magnetic field, and direction is contrary, the 3rd stem stem and four-limbed then exit saturation condition, the reactance value of tertiary coil, the 4th coil then increase sharply into
l u ; Current-limiting reactor
l1alternating current path will be sealed at this moment, short-circuit current will be limited; At short circuit current negative half period, the first stem stem, the second stem stem then exit saturation condition, the reactance value of the first coil, the second coil increase sharply into
l u , the 3rd stem stem and four-limbed enter saturation condition once more, and the reactance value of tertiary coil, the 4th coil is reduced to once more
l s ; Current-limiting reactor
l1now still be in alternating current path, short-circuit current is provided constraints; Therefore when fault occurs, first stem stem, the second stem stem and the 3rd stem stem, four-limbed alternately exit saturation condition, the resistance value of each coil also alternately increases and reduces, the path also generating period change of alternating current, but current-limiting reactor can seal in alternating current path always, therefore the overall impedance value of the saturated fault current limiter of hybrid magnetic in transmission line can obviously increase, and effectively limits short-circuit current.After failture evacuation, alternating current reduces rapidly, and now the operating state of the saturated flow restricter of hybrid magnetic recovers again state when circuit normally runs, and the overall impedance value of the saturated flow restricter of hybrid magnetic reduces rapidly again, normally can not run have an impact to system.
Beneficial effect of the present invention:
1. use permanent magnet and DC coil winding together as excitation bias source, effectively reduce the requirement to direct current biasing source, reduce the demagnetization risk of permanent magnet, while raising device reliability, reduce device loss and cost;
2. by using bridge architecture, realize ac and dc current and share winding, which effectively reduces device volume, saves material and reduces costs, reduce loss simultaneously;
3. carry out fault current limiting by the current-limiting reactor in direct current biasing loop, ensure that current limitation effect on the one hand, on the other hand current limit levels can be controlled;
4. four coil windings by one connected mode connection in series-parallel cleverly together, ensureing under the prerequisite that fault current limiter normally works, electric current in each coil windings is reduced by half, reduce loss during normal operation, greatly reduce the fault curre in each coil windings, permanent magnet demagnetization and the anti-phase saturated possibility of iron core are reduced, improves the reliability of device;
5. need not install control system additional, flow restricter can make quick response to fault automatically, seals in large impedance in the line rapidly, effectively limits short-circuit current;
6. the normal influence on system operation of pair circuit is little, and current limitation effect is obvious, and compact conformation, fast response time, reliability is high.
Accompanying drawing explanation
Fig. 1: the structural representation being the embodiment of the present invention.
Fig. 2: the core structure figure being the embodiment of the present invention.
Fig. 3: the fundamental diagram being the embodiment of the present invention.
Fig. 4: the structural representation being non-patent literature 1.
Embodiment
The features and advantages of the invention can be understood further by reference to the accompanying drawings by following detailed description.The embodiment provided is only the explanation to the inventive method, and does not limit the present invention in any way all the other contents of announcement.
As shown in Figure 1, the saturated fault current limiter of a kind of hybrid magnetic, comprise iron core, coil windings, DC power supply and current-limiting reactor, described iron core comprises opening stem stem and lays respectively at first stem stem on the described opening stem stem left side, 3rd stem stem on the second stem stem and the right, four-limbed, the two ends up and down of described opening stem stem have upper horizontal yoke respectively, bottom rail yoke, the first permanent magnet is inlaid with in described horizontal yoke, 3rd permanent magnet, the second permanent magnet is inlaid with in described bottom rail yoke, 4th permanent magnet, described horizontal yoke two ends connect described first stem stem respectively, 3rd stem stem, described second stem stem is connected successively in the middle part of it, opening stem stem, four-limbed, described coil windings comprises the first coil, the second coil, tertiary coil, the 4th coil that are wound on respectively on described first stem stem, the second stem stem, the 3rd stem stem, four-limbed, one end of transmission line is accessed after described one end of first coil is connected with one end of tertiary coil, one end of described second coil is connected the rear other end accessing transmission line with one end of the 4th coil, the other end of described first coil is connected with the other end of the 4th coil, and the described other end of the second coil is connected with the other end of tertiary coil, described DC power supply and described current-limiting reactor are connected with the port of described first coil and the port of described tertiary coil after connecting.
The saturated fault current limiter of hybrid magnetic of the present embodiment comprises iron core, coil windings, DC power supply and a current-limiting reactor, and iron core is by the first stem stem K1, the second stem stem K2, the 3rd stem stem K3, four-limbed K4, opening stem stem K0, upper horizontal yoke C1, bottom rail yoke C2 and be embedded in the first permanent magnet P1 of upper horizontal yoke post left side central portion respectively, the second permanent magnet P2, the 3rd permanent magnet P3 of upper horizontal yoke post right side central of bottom rail yoke post left side central portion and the 4th permanent magnet P4 of bottom rail yoke post right side central forms; First stem stem K1 is wound with the first coil 1, second stem stem K2 and is wound with the second coil the 2, three stem stem K3 and is wound with tertiary coil 3, and four-limbed K4 is wound with the 4th coil 4; One end of transmission line is accessed after one end D11 of the first coil 1 is connected with one end D31 of tertiary coil 3, one end D22 of the second coil 2 is connected the rear other end accessing transmission line with one end D42 of the 4th coil 4, the other end D12 of the first coil 1 is connected with the other end D41 of the 4th coil 4, and the other end D32 of tertiary coil 3 is connected with the other end D21 of the second coil 2; Be connected with the port D12 of the first coil 1 and the port D32 of tertiary coil 3 after DC power supply E1 and current-limiting reactor L1 connect, access in four coils, form bridge architecture.The reactance value of current-limiting reactor L1 is while meeting current limliting requirement, reactance value is less than the induction reactance value of winding coil when stem stem iron core is unsaturated, and be greater than stem stem saturated time induction reactance value, can make when fault occurs like this, alternating current can circulate according to the circulation path shown in Fig. 3, and current-limiting reactor plays metering function.First coil 1, second coil 2, tertiary coil 3 are identical with the number of turn of the 4th coil 4, the first coil 1 and the 4th coil 4 around to identical, the second coil 2 and tertiary coil 3 around to identical, the first coil 1 and the second coil 2 around on the contrary; When access transmission line runs, alternating current and direct current share coil windings, and exchange flux and direct current flux all form loop through iron core, and the magnetic flux that permanent magnet excitation produces also forms loop in the core which, and three magnetic flux actings in conjunction are in stem stem.
The first stem stem K1 in iron core, the second stem stem K2, the 3rd stem stem K3, four-limbed K4, opening stem stem K0 cross section can be circular, oval or rectangle, the present embodiment adopts rectangle, as shown in Figure 2, first stem stem K1, the second stem stem K2, the 3rd stem stem K3 and four-limbed K4 are rectangle, sectional area S
1, S
2, S
3, S
4all equal, and identical length etc.; Described upper horizontal yoke C1, the length of bottom rail yoke C2 are all equal with sectional area, and the sectional area of described horizontal yoke is greater than the sectional area S of stem stem
5>S
1, make when stem stem enters saturation condition, horizontal yoke core still unsaturation; Described opening stem stem K0 cross section is rectangle, and sectional area is greater than the sectional area S of horizontal yoke
7>S
5, and gas length is less than permanent magnet length, makes the magnetic resistance of opening stem stem K0 be less than the magnetic resistance of permanent magnetism, effectively can reduce the exchange flux by permanent magnet when fault occurs like this, thus reduce the eddy current loss in permanent magnet, reduce the temperature rise of flow restricter.The sectional area of the first described permanent magnet P1, the second permanent magnet P2, the 3rd permanent magnet P3 and the 4th permanent magnet P4 equals the sectional area of the horizontal yoke at its place, and the thickness of these four permanent magnets is identical, dimensional structure size is completely the same, this is the symmetry in order to ensure magnetic structure, and described core structure becomes axial symmetry about the center line of the opening stem stem K0 being positioned at middle part.
As shown in Figure 3, the operation principle of the present embodiment is connected with transmission line by adjustable for coil induction reactance value magnetic saturation type flow restricter, realizes the restriction to short-circuit current.
The course of work of the present embodiment is: the loop of direct current in coil as shown in fig. 1, therefore the magnetic direction that induces in coil of direct current is consistent with permanent magnet magnetic field direction superposes mutually, form bias magnetic field, when circuit normally runs, in the half period of line current positive direction as shown in Figure 1, the AC magnetic field direction that first coil 1 and second coil 2 of left side iron core produce is consistent with bias magnetic field direction, under the bias in the magnetic field of superposition mutually, the first stem stem K1 and the equal penetration depth saturation condition of the second stem stem K2; The AC magnetic field direction that the tertiary coil 3 of right side iron core and the 4th coil 4 produce is contrary with bias magnetic field direction, but when circuit normally runs, the AC magnetic field that coil produces is less than bias magnetic field, under the bias in the magnetic field of cancelling out each other, the 3rd stem stem K3 and four-limbed K4 is still in saturation condition; At the negative half period of line current, the AC magnetic field of left side iron core is contrary with bias magnetic field direction, and the AC magnetic field of right side iron core is identical with bias magnetic field direction, and the first stem stem K1, the second stem stem K2, the 3rd stem stem K3 and four-limbed K4 are still in saturation condition; Therefore, when circuit is in nominal situation, the resistance value that the coil windings of the saturated fault current limiter of hybrid magnetic presents in transmission line is less, and the reactance value that coil presents is
l s , and alternating current does not flow through current-limiting reactor
l1, therefore voltage loss and energy loss less, on system cloud gray model impact very little.The circulation path of alternating current is as shown in Fig. 3 (a).
When transmission line is short-circuited fault, fault current increases rapidly, and short circuit current
i f be greater than maximum load current.Therefore, the AC magnetic field that each coil produces will be greater than bias magnetic field; At the positive half cycle of short circuit current, the AC magnetic field that the first coil 1 of left side iron core and the second coil 2 produce increases, and direction is consistent with bias magnetic field direction, and the degree of saturation of the first stem stem K1, the second stem stem K2 is deepened, the reactance value of the first coil 1, second coil 2
l s still less; The AC magnetic field that the tertiary coil 3 of right side iron core and the 4th coil 4 produce also increases, the AC magnetic field produced due to coil is greater than bias magnetic field, and direction is contrary, the 3rd stem stem K3 and four-limbed K4 then exits saturation condition, the reactance value of tertiary coil 3, the 4th coil 4 then increase sharply into
l u ; Now the circulation path of alternating current as shown in Figure 3 (b), current-limiting reactor
l1alternating current path will be sealed at this moment, short-circuit current will be limited; At short circuit current negative half period, the first stem stem K1, the second stem stem K2 then exit saturation condition, the reactance value of the first coil 1, second coil 2 increase sharply into
l u , the 3rd stem stem K3 and four-limbed K4 enters saturation condition once more, and the reactance value of tertiary coil 3, the 4th coil 4 is reduced to once more
l s ; Now alternating current circulation path as shown in Figure 3 (c), current-limiting reactor
l1now still be in alternating current path, short-circuit current is provided constraints; Therefore when fault occurs, first stem stem K1, the second stem stem K2 and the 3rd stem stem K3, four-limbed K4 alternately exit saturation condition, the resistance value of each coil also alternately increases and reduces, the path also generating period change of alternating current, but current-limiting reactor can seal in alternating current path always, therefore the overall impedance value of the saturated fault current limiter of hybrid magnetic in transmission line can obviously increase, and effectively limits short-circuit current, ensure line security, maintenance system power grid security.After failture evacuation, alternating current reduces rapidly, now the operating state of the saturated fault current limiter of hybrid magnetic recovers again state when circuit normally runs, and the overall impedance value of the saturated fault current limiter of hybrid magnetic reduces rapidly again, can not have an impact to the normal operation of system.
The present embodiment uses permanent magnet and DC coil winding together as excitation bias source, effectively reduces the requirement to direct current biasing source, reduces the demagnetization risk of permanent magnet, while raising device reliability, reduces device loss and cost; By using bridge architecture, realizing ac and dc current and sharing winding, reducing the volume of device, save material and reduce costs, reduce loss simultaneously; Carry out fault current limiting by the current-limiting reactor in direct current biasing loop, ensure that current limitation effect on the one hand, on the other hand current limit levels can be controlled; By four coil windings by one connected mode connection in series-parallel cleverly together, ensureing under the prerequisite that fault current limiter normally works, electric current in each coil windings is reduced by half, decrease loss during normal operation, greatly reduce the fault curre in each coil windings, reduce permanent magnet demagnetization and the anti-phase saturated possibility of iron core, improve the reliability of device; Need not install control system additional, flow restricter can make quick response to fault automatically, seals in large impedance in the line rapidly, effectively limits short-circuit current; And do not affect circuit and normally run, current limitation effect is obvious, and compact conformation, fast response time, reliability is high.
The part that this specification does not elaborate all belongs to prior art.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; therefore the restriction to scope of patent protection of the present invention can not be thought; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that the claims in the present invention protect; can also make and replacing or distortion, all fall within protection scope of the present invention, request protection range of the present invention should be as the criterion with claims.
Claims (7)
1. the saturated fault current limiter of hybrid magnetic, it is characterized in that: comprise iron core, coil windings, DC power supply and current-limiting reactor, described iron core comprises opening stem stem and lays respectively at first stem stem on the described opening stem stem left side, 3rd stem stem on the second stem stem and the right, four-limbed, the two ends up and down of described opening stem stem have upper horizontal yoke respectively, bottom rail yoke, the first permanent magnet is inlaid with in described horizontal yoke, 3rd permanent magnet, the second permanent magnet is inlaid with in described bottom rail yoke, 4th permanent magnet, described horizontal yoke two ends connect described first stem stem respectively, 3rd stem stem, described second stem stem is connected successively in the middle part of it, opening stem stem, four-limbed, described coil windings comprises the first coil, the second coil, tertiary coil, the 4th coil that are wound on respectively on described first stem stem, the second stem stem, the 3rd stem stem, four-limbed, one end of transmission line is accessed after described one end of first coil is connected with one end of tertiary coil, one end of described second coil is connected the rear other end accessing transmission line with one end of the 4th coil, the other end of described first coil is connected with the other end of the 4th coil, and the described other end of the second coil is connected with the other end of tertiary coil, described DC power supply and described current-limiting reactor are connected with the port of described first coil and the port of described tertiary coil after connecting.
2. the saturated fault current limiter of hybrid magnetic according to claim 1, is characterized in that: described iron core becomes axial symmetry about the center line of described opening stem stem.
3. the saturated fault current limiter of hybrid magnetic according to claim 1, is characterized in that: the centre of described opening stem stem has an air gap.
4. the saturated fault current limiter of the hybrid magnetic according to claim 1 or 3, it is characterized in that: described horizontal yoke left side central portion is inlaid with described first permanent magnet, right side central is inlaid with described 3rd permanent magnet, described bottom rail yoke left side central portion is inlaid with described second permanent magnet, and right side central is inlaid with described 4th permanent magnet; Described first permanent magnet and the second permanent magnet excitation direction in the iron core of left side is identical, and described 3rd permanent magnet is identical with the 4th permanent magnet excitation direction in the iron core of right side; First, second, third and fourth magnet size described is identical, and sectional area is equal with the sectional area of the horizontal yoke in respective place, and its length is greater than the gas length of described opening stem stem.
5. the saturated fault current limiter of hybrid magnetic according to claim 1, is characterized in that: described first stem stem, the second stem stem, the 3rd stem stem and four-limbed cross section are circle, ellipse or rectangle, and its sectional area is equal, and length is equal; Described opening stem stem cross section is circular, oval or rectangle, and sectional area is greater than the sectional area of described horizontal yoke; The length of described horizontal yoke, bottom rail yoke is equal, and sectional area is equal, and its sectional area is greater than the sectional area of described first stem stem, the second stem stem, the 3rd stem stem, four-limbed.
6. the saturated fault current limiter of hybrid magnetic according to claim 1, is characterized in that: the equal turn numbers of described first coil, the second coil, tertiary coil and the 4th coil.
7. the saturated fault current limiter of hybrid magnetic according to claim 1, is characterized in that: the reactance value of described current-limiting reactor is less than the induction reactance value of described winding coil when stem stem is unsaturated, and be greater than stem stem saturated time induction reactance value.
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| CN105529694A (en) * | 2016-02-01 | 2016-04-27 | 上海理工大学 | Saturated core-type fault current limiter capable of relieving DC impact |
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| CN202424148U (en) * | 2011-12-23 | 2012-09-05 | 特变电工沈阳变压器集团有限公司 | Normal conductor direct current coil-based saturated core fault current limiter |
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Cited By (9)
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| CN105529694A (en) * | 2016-02-01 | 2016-04-27 | 上海理工大学 | Saturated core-type fault current limiter capable of relieving DC impact |
| CN105529694B (en) * | 2016-02-01 | 2017-12-26 | 上海理工大学 | Mitigate the saturable core type fault current limiter of direct current impact |
| CN107181246A (en) * | 2017-05-15 | 2017-09-19 | 东南大学 | A kind of three-phase magnetic saturation type fault current limiter |
| CN106992068A (en) * | 2017-05-31 | 2017-07-28 | 苏州吴变电气科技有限公司 | One kind remembers magnetic flux magnetic assist adjustable magnetic type cross magnetization controlled reactor based on direct current |
| CN109378812A (en) * | 2018-12-10 | 2019-02-22 | 武汉大学 | A kind of the magnetic saturation iron core DC Line Fault current limiter and current-limiting method of high inductance no-load voltage ratio |
| CN113593845A (en) * | 2021-08-03 | 2021-11-02 | 南京一体科技有限公司 | Composite excitation bidirectional magnetic flux controllable device |
| CN114512971A (en) * | 2022-01-13 | 2022-05-17 | 武汉大学 | Hybrid excitation multifunctional saturated iron core alternating current fault current limiter and current limiting method |
| CN114974830A (en) * | 2022-06-10 | 2022-08-30 | 武汉大学 | High-voltage magnetic saturation current limiter of magnetic integrated decoupling winding and winding inductance calculation method |
| CN114974830B (en) * | 2022-06-10 | 2024-05-14 | 武汉大学 | High-voltage magnetic saturation current limiter of magnetic integrated decoupling winding and winding inductance calculation method |
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