CN102790382A - Current limited soft connecting/disconnecting device - Google Patents
Current limited soft connecting/disconnecting device Download PDFInfo
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- CN102790382A CN102790382A CN201210252205XA CN201210252205A CN102790382A CN 102790382 A CN102790382 A CN 102790382A CN 201210252205X A CN201210252205X A CN 201210252205XA CN 201210252205 A CN201210252205 A CN 201210252205A CN 102790382 A CN102790382 A CN 102790382A
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Abstract
The invention provides a current limited soft connecting/disconnecting device. The device is characterized in that a first winding L1 of a tight coupling double-winding reactor is connected with a first circuit breaker K1 in series, and then is connected with a second winding L2 in parallel; a single branch winding can be connected and disconnected by adopting a circuit breaker with a breaking capacity of 50 percent of short circuit current; after the first winding L1 is disconnected, the reactance of the tight coupling double-winding reactor is increased fast, and the short circuit current of the system is reduced. As the reactance values of various branch windings of the tight coupling double-winding reactor are rationally designed, the tight coupling double-winding reactor can be operated in small reactance and affects the system operation little when the system runs stably; while when the short circuit failure exists, the reactance value of the tight coupling double-winding reactor is increased to a rated reactance of the system, if the system is in a temporary fault, a second circuit breaker K2 is not needed to be disconnected; after the first circuit breaker K1 automatically switches on again, if the short circuit current of the system still exceeds the standard, the first circuit breaker K1 and the second circuit breaker K2 are disconnected in sequence.
Description
Technical field
The present invention relates to the soft beginning device of a kind of current limliting.
Background technology
Along with fast development of national economy; Society constantly increases the demand of electric power; Driven the continuous development of electric power system; Single-machine capacity and station capacity, substation capacity, city and center of industry load constantly increase, and just make between the electric power system interconnectedly, and the short circuit current level in the electrical networks at different levels improves constantly.However, general way remains and adopts circuit breaker that faulty line is cut-off, and protects power equipment on the one hand, also avoids on the other hand because busbar voltage is crossed low and the user is caused adverse effect.Along with improving constantly of short circuit current level, just need improve constantly the capacity that cut-offs of circuit breaker.For this reason; The researcher has carried out a large amount of research to aspects such as the electromagnetism of circuit breaker and mechanical structure, contact material, arc-extinguishing mediums; The capacity that cut-offs of low-voltage alternating-current circuit breaker has reached 125kA, and the capacity that cut-offs that is applied to the AC circuit breaker of high pressure such as 220kV, 330kV, 500kV and ultrahigh voltage power system has reached 75kA.Yet, further improve the capacity that cut-offs of circuit breaker, more and more difficult technically not only, and also cost also will increase substantially.In addition, directly parallel connection use of circuit breaker.Therefore, the off-capacity of cut-offfing of electric network fault short circuit current has more and more become the important bottleneck problem that limits power network development.
Consider the off-capacity of cut-offfing of circuit breaker, in recent years, multiple restriction grid short circuit method of current also began to be paid close attention to and use.Restriction grid short circuit method of current mainly contains: line voltage is improved in (1); (2) untie electrical network and connect, comprise the connection of breaking off between some transmission lines or double-bus.When short trouble occurring, can close and close back-up breaker guarantee power supply; (3) improve the short-circuit of power transformer impedance; (4) installing current limiting reactor; (5) installing fault current limiter.Yet the cost that improves the line voltage grade is too high; Untie the method that electrical network connects, can cause the power supply reliability of electrical network to reduce greatly; Adopting high-impedance transformer or current limiting reactor is that present limiting short-circuit current the most also is the most ripe scheme, but needs consume reactive power and be unfavorable for the electrical network transient stability.In order to eliminate the shortcoming of current limiting reactor, the researcher has proposed this solution of fault current limiter.Fault current limiter impedance under normal operation is very little, and impedance becomes big and current limliting when short trouble.Fault current limiter is divided into two kinds on superconduct and non-superconducting type.The superconduct fault current limiter is divided into structural shapes such as resistor-type, saturable core type, bridge circuit type, induction shield type, and non-superconducting type fault current limiter is divided into structural shapes such as bridge circuit type, series resonance-type, Parallel Resonant, magnetic saturation type, paralleling switch throwing reactance type.Superconduct and non-superconducting type fault current limiter exist all that cost is high, running wastage is big or shortcoming such as reliability is low, face very big challenge.
Consider that existing high-voltage large-capacity circuit breaker cut-offs off-capacity, directly parallel connection; Superconduct and non-superconducting type fault current limiter technology are still immature; If construct large capcity breaker in the enough a kind of modes that is dirt cheap of current ability, will have very positive meaning.Chinese patent 200710052947.7 discloses a kind of parallel circuit breaker; Compose in parallel by 2 ~ 4 branch roads; Every branch road comprises the inductance coil and the circuit breaker of series connection, the inductance coil equal turn numbers of each branch road, and the magnetic flux that in each magnetic circuit of iron core, produces is opposite in twos.This patent adopts 2 ~ 4 identical circuit breakers that cut-off capacity to be in parallel, and realizes cut-offfing big electric current.But this circuit breaker is in interrupting process, and the fault current maximum only can be restricted to 25% ~ 50% of system short-circuit electric current, does not possess the soft connecting-disconnecting function to circuit; And the circuit breaker quantity that the disclosed parallel circuit breaker of this patent adopts is also more, and the capacity that cut-offs of circuit breaker descends not obvious.
Summary of the invention
The objective of the invention is to overcome the shortcoming of conventional circuit breaker and current limiting reactor, propose a kind of have simultaneously current-limiting function and the soft soft breaking device of current limliting that cut-offs function.The present invention at first earlier connects the single branch road of close coupling double winding reactor with circuit breaker, and this series arm is parallelly connected with another branch road of this close coupling double winding reactor more then, and the capacity that cut-offs of circuit breaker is reduced to 50% of capacity of short circuit.Simultaneously, after this circuit breaker broke off, the impedance of reactor increased sharply, and another circuit breaker can no longer need to break off like this, thereby realized the soft of faulty line cut-off.The soft breaking device of current limliting that the present invention proposes, flexible, easy enforcement can be applicable in the network system of various different electric pressures, different capabilities.
To achieve these goals, the technical scheme of the present invention's employing is following:
The soft breaking device of current limliting of the present invention by close coupling double winding reactor, first circuit breaker, second circuit breaker, or add capacitor and constitute, described close coupling double winding reactor can be one or two.Close coupling double winding reactor is made up of the closure or the semi-closed iron core of first winding, second winding and rectangle, and described first winding is identical with the number of turn of second winding, is wound on the inverse parallel mode on two stem stems of said iron core.
Several kinds of technical schemes below the present invention can adopt:
First winding of close coupling double winding reactor and first circuit breaker be series connection earlier, first winding of close coupling double winding reactor and second winding parallel connection then, last close coupling double winding reactor and the series connection of second circuit breaker.
First winding of close coupling double winding reactor and first circuit breaker be series connection earlier, first winding of close coupling double winding reactor and second winding parallel connection then, and parallelly connected with capacitor, last close coupling double winding reactor and the series connection of second circuit breaker.
Two close coupling double winding reactors adopt the two-level concatenation connected mode, and first winding of secondary close coupling double winding reactor and first circuit breaker be series connection earlier, and second winding with secondary close coupling double winding reactor carries out parallel connection then; Next; First windings in series of whole secondary close coupling double winding reactor and one-level close coupling double winding reactor; Second winding with one-level close coupling double winding reactor carries out parallel connection then, afterbody close coupling double winding reactor and the series connection of second circuit breaker.
Two close coupling double winding reactors adopt the two-level concatenation connected mode, and can also be: first winding and first circuit breaker of secondary close coupling double winding reactor be connected earlier, and second winding with secondary close coupling double winding reactor carries out parallel connection then; Next; First windings in series of whole secondary close coupling double winding reactor and one-level close coupling double winding reactor; Second winding with one-level close coupling double winding reactor carries out parallel connection then, and parallelly connected with capacitor, afterbody close coupling double winding reactor and the series connection of second circuit breaker.
The soft breaking device of this current limliting shows as Low ESR when normal operation; When the system burst short circuit, cut-off owing to first circuit breaker; Total reactance value of device increases sharply; The short circuit current of system is reduced to the rated current level, and such second circuit breaker can no longer need to break off, thereby realizes the soft of faulty line cut-off.If permanent fault has taken place in system, second circuit breaker also is easy to break off.The reactor that the soft breaking device of current limliting of the present invention adopts is a close coupling double winding reactor, and reactor can adopt iron core or half core structure; Reactor and circuit breaker can adopt three-phase absolute construction or three-phase combining structure.
The present invention has following major advantage:
1) the present invention realizes current limliting and cut-offs function through the impedance variations of close coupling double winding reactor self in the circuit breaker interrupting process, need not add control system.Therefore, the soft breaking device of this current limliting is simple in structure, easy to be realized, and reliability is high.
2) the soft breaking device of current limliting of the present invention is little to the stable state influence of electrical network.When normal operation, the stable state impedance of reactor is very little, and it is idle can not to increase system, and steady-state behaviour is superior to existing current limiting reactor.
3) the present invention can be used for constructing jumbo circuit breaker.The mode that adopts the single branch road of close coupling double winding reactor to connect with circuit breaker reduces the capacity that cut-offs of circuit breaker, has reduced technical difficulty and cost that large-scale circuit breaker is made, and the market competitiveness is more arranged.
Description of drawings
Below in conjunction with accompanying drawing and embodiment, the present invention is described further.
Fig. 1 is circuit and the magnetic circuit sketch map of the soft breaking device of the specific embodiment of the invention 1 current limliting when steady operation;
Fig. 2 is that the soft breaking device of the specific embodiment of the invention 1 current limliting is at short circuit electric circuit and magnetic circuit sketch map;
Fig. 3 is the equivalent circuit diagram of the soft breaking device of the specific embodiment of the invention 1 current limliting;
Fig. 4 is the equivalent circuit diagram of the soft breaking device of the specific embodiment of the invention 2 Parallel Resonant current limlitings;
Fig. 5 is the equivalent circuit diagram of the soft breaking device of the specific embodiment of the invention 3 two-level concatenation structure current limlitings;
Fig. 6 is the equivalent circuit diagram of the soft breaking device of the specific embodiment of the invention 4 Parallel Resonant two-level concatenation structure current limlitings.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described:
The present invention is applied to close coupling double winding reactor the soft of faulty line cut-off, and when promptly in system accidental short trouble taking place, faulty line can not need cut-off and can ensure the normal operation of non-fault line.
Shown in Figure 1 is circuit and the magnetic circuit sketch map of the soft breaking device of the embodiment of the invention 1 current limliting when steady operation.The close coupling double winding reactor that the soft breaking device of described current limliting is made up of first winding L 1, second winding L 2, rectangle closure or semi-closed iron core, and the first circuit breaker K1 and the second circuit breaker K2 form.In the described close coupling double winding reactor, first winding L 1 is identical with the number of turn of second winding L 2, is wound on the inverse parallel mode on two stem stems of said iron core.First winding L 1 of close coupling double winding reactor earlier with first circuit breaker K1 series connection, and then and 2 parallel connections of second winding L, last whole close coupling double winding reactor is connected with the second circuit breaker K2 again.When operate as normal, the first circuit breaker K1 and the second circuit breaker K2 are in closure state, and first winding L 1 is identical with the electric current that second winding L 2 is passed through, and the magnetic flux equal and opposite in direction of generation is in the opposite direction.Because the magnetic flux that this iron core reactor produces when operate as normal is mainly leakage flux, leakage inductance is relatively very little, and is therefore very little to electric network influencing.In addition; Because the winding of this close coupling double winding reactor iron core magnetic flux when normal operation is very little; The ampacity of first winding L 1 and second winding L 2 is the half the of system power, and therefore, the first circuit breaker K1 can select to cut-off the circuit breaker that capacity is a system short circuit capacity 50%.Simultaneously, total iron loss and the copper loss of this close coupling double winding reactor all can be controlled in lower level.
Shown in Figure 2 is the ruuning situation of the soft breaking device of the embodiment of the invention 1 current limliting when system's failed because.As stated, when normal operation, the ampacity of the first circuit breaker K1 is 1/2 system power.When short trouble takes place,, the first circuit breaker K1 is broken off earlier through parameter tuning; The magnetic flux of reactor will mainly pass through from iron core, and the reactance meeting of reactor increases rapidly, thereby short circuit current is limited; Select the reactance value of appropriate design first winding L 1 and second winding L 2; Can short circuit current be restricted near the rated current, such second circuit breaker can not need to break off, thereby realizes the soft of faulty line cut-off.
As shown in Figure 3, be the equivalent circuit diagram of the soft breaking device of embodiment 1 current limliting.The self-induction of two winding L of close coupling double winding reactor 1 and L2 is respectively L
1And L
2, mutual inductance is M.Because the double winding number of turn is identical, end of the same name is opposite, so L
1=L
2, mutual inductance M and L
1And L
2Very approaching; First winding L 1 of close coupling double winding reactor earlier with first circuit breaker K1 series connection, and then and 2 parallel connections of second winding L, last whole close coupling double winding reactor is connected with the second circuit breaker K2 again.When system normally moves; The reactance value of reactor
is a very little numerical value; Very little to systematic influence, the ampacity of the first circuit breaker K1 is 50% of a transmission line electric current.When system's failed because,, the first circuit breaker K1 is cut-off, the reactance value L '=L of reactor earlier through the parameter tuning of circuit breaker
2, the short circuit current of system descends rapidly.Through selecting suitable design parameter, can make short circuit current be reduced to value, therefore near specified running current; If phylogenetic is non-permanent fault; Only need to break off the first circuit breaker K1, the second circuit breaker K2 can not need to break off, thereby realizes the soft of faulty line cut-off.If permanent short trouble has taken place in system, because short circuit current and specified running current size are approaching, the second circuit breaker K2 can be easy to break off.Iron core or half core structure are all adopted in the design of close coupling double winding reactor, than being easier to reach above-mentioned design objective.
As shown in Figure 4, be the equivalent circuit diagram of the soft breaking device of embodiment 2 Parallel Resonant current limlitings.Identical with embodiment 1, the self-induction of two winding L of close coupling double winding reactor 1 and L2 is respectively L
1And L
2, mutual inductance is M.Because the double winding number of turn is identical, end of the same name is opposite, so L
1=L
2, mutual inductance M and L
1And L
2Very approaching; First winding L 1 of close coupling double winding reactor earlier with first circuit breaker K1 series connection, and then and 2 parallel connections of second winding L; Different with embodiment 1 is: the close coupling double winding is connected with the second circuit breaker K2 with capacitor C parallel connection earlier afterwards again.When system normally moves, the reactance value of reactor
Be a very little numerical value, system impedance does
Through appropriate design, make ω
2LC＜＜1.Therefore, when normally moving in system, system power will mainly flow through from reactor, and the ampacity of the first circuit breaker K1 is 50% of a transmission line electric current.When system's failed because, through the parameter tuning of circuit breaker, the first circuit breaker K1 is cut-off earlier, after the first circuit breaker K1 cut-offs, the reactance value L '=L of reactor
2,, make ω through appropriate design
2L ' C ≈ 1, the principle of promptly utilizing parallel resonance is that the total impedance of circuit increases sharply, short circuit current can descend rapidly.Through selecting suitable design parameter, can make short circuit current be reduced to value, therefore near specified running current; If phylogenetic is non-permanent fault; Only need to break off the first circuit breaker K1, the second circuit breaker K2 can not need to break off, thereby realizes the soft of faulty line cut-off.If permanent short trouble has taken place in system, because short circuit current and specified running current size are approaching, the second circuit breaker K2 can be easy to break off.Iron core or half core structure are all adopted in the design of close coupling double winding reactor, than being easier to reach above-mentioned design objective.
As shown in Figure 5, the equivalent circuit diagram of the soft breaking device of the embodiment of the invention 3 two-level concatenation structure current limlitings.The self-induction of two winding L of one-level close coupling double winding reactor 1 and L2 is respectively L
1And L
2, mutual inductance is M, L
1=L
2The structure and the one-level reactor of secondary close coupling double winding reactor are similar, and the mutual inductance of first winding L 11 and second winding L 12 is M
1, self-induction L
11=L
12First winding L 11 of secondary close coupling double winding reactor earlier with first circuit breaker K1 series connection, and then and 12 parallel connections of second winding L; First winding L, 1 series connection of secondary close coupling double winding reactor and one-level close coupling double winding reactor is then with 2 parallel connections of second winding L; Afterbody close coupling double winding reactor is connected with the second circuit breaker K2; The reactance value of reactor when operate as normal
Very little to systematic influence; When system broke down short circuit, the capacity that cut-offs of first circuit breaker was a short circuit current 25%, and the reactance value of reactor changes,
Through appropriate design L
1And L
2, L
12And L
22Numerical value, can make L ' and rated impedance approaching, such second circuit breaker K2 can no longer need to break off, thereby realizes the soft of faulty line cut-off.If permanent short trouble has taken place in system, because short circuit current and specified running current size are approaching, the second circuit breaker K2 can be easy to break off.One-level close coupling double winding reactor and the design of secondary close coupling double winding reactor all can be adopted iron core or half core structure, than being easier to reach above-mentioned design objective.
As shown in Figure 6, the equivalent circuit diagram of the soft breaking device of the embodiment of the invention 4 Parallel Resonant two-level concatenation structure current limlitings.Identical with embodiment 3 is: the self-induction of two winding L of one-level close coupling double winding reactor 1 and L2 is respectively L
1And L
2, mutual inductance is M, L
1=L
2The structure and the one-level reactor of secondary close coupling double winding reactor are similar, and the mutual inductance of first winding L 11 and second winding L 12 is M
1, self-induction L
11=L
12 First winding L 11 of secondary close coupling double winding reactor earlier with first circuit breaker K1 series connection, and then and 12 parallel connections of second winding L; First winding L, 1 series connection of secondary close coupling double winding reactor and one-level close coupling double winding reactor is then with 2 parallel connections of second winding L.Different with embodiment 3 is: one-level close coupling double winding reactor is connected with the second circuit breaker K2 earlier and after the capacitor C parallel connection again.The reactance value of close coupling reactor when operate as normal
Be a very little numerical value; System impedance does
Through appropriate design, make ω
2LC＜＜1, very little to systematic influence; When system broke down short circuit, the capacity that cut-offs of first circuit breaker was 25% of a short circuit current, and the reactance value of reactor changes,
System impedance does
Through appropriate design L
1And L
2, L
12And L
22, and the numerical value of capacitor C, can make ω
2L ' C ≈ 1, system impedance is increased to the level close with rated impedance, and such second circuit breaker K2 can no longer need to break off, thereby realizes the soft of faulty line cut-off.If permanent short trouble has taken place in system, because short circuit current and specified running current size are approaching, the second circuit breaker K2 can be easy to break off.One-level reactor in the current limiting circuit breaker and the design of secondary reactor also can be adopted iron core or half core structure, than being easier to reach above-mentioned design objective.
Claims (4)
1. the soft breaking device of current limliting is characterized in that, the soft breaking device of described current limliting is made up of close coupling double winding reactor, first circuit breaker (K1) and second circuit breaker (K2); Described close coupling double winding reactor is made up of the closure or the semi-closed iron core of first winding (L1), second winding (L2) and rectangle; Described first winding (L1) is identical with the number of turn of second winding (L2), is wound on the inverse parallel mode on two stem stems of said iron core; First winding (L1) elder generation of described close coupling double winding reactor and first circuit breaker (K1) series connection; Second winding (L2) parallel connection of first winding (L1) of described then close coupling double winding reactor and close coupling double winding reactor, last described close coupling double winding reactor and second circuit breaker (K2) series connection.
2. the soft breaking device of current limliting according to claim 1; It is characterized by first winding (L1) elder generation and first circuit breaker (K1) series connection of described close coupling double winding reactor; First winding (L1) of described then close coupling double winding reactor and second winding (L2) parallel connection; And and capacitor (C) parallel connection, last described close coupling double winding reactor and second circuit breaker (K2) series connection.
3. the soft breaking device of current limliting according to claim 1; It is characterized in that two described close coupling double winding reactors adopt the two-level concatenation mode to connect: first winding (L11) of secondary close coupling double winding reactor and first circuit breaker (K1) be series connection earlier, first winding (L11) of described then secondary close coupling double winding reactor and second winding (L12) parallel connection; Described secondary close coupling double winding reactor is connected with first winding (L1) of one-level close coupling double winding reactor, carries out parallel connection with second winding (L2) then, last described one-level close coupling double winding reactor and second circuit breaker (K2) series connection.
4. the soft breaking device of current limliting according to claim 3; It is characterized by first winding (L11) and first circuit breaker (K1) series connection earlier of described secondary close coupling double winding reactor, first winding (L11) of described then secondary close coupling double winding reactor and second winding (L12) parallel connection; Described secondary close coupling double winding reactor is connected with first winding (L1) of one-level close coupling double winding reactor afterwards and described second winding (L2) parallel connection; And and capacitor (C) parallel connection, last described one-level close coupling double winding reactor and second circuit breaker (K2) series connection.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078306A (en) * | 2013-01-09 | 2013-05-01 | 中国科学院电工研究所 | Fault current limiter on basis of combined rapid switch-on switch |
| CN103840442A (en) * | 2014-03-12 | 2014-06-04 | 中国科学院电工研究所 | Short-circuit fault current limiter |
| CN103928214A (en) * | 2014-03-26 | 2014-07-16 | 中国科学院电工研究所 | Double-column double-split reactor applied to current limiter |
| CN105098737A (en) * | 2014-11-24 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | High-efficiency high-speed current limiting actuator |
| CN105281286A (en) * | 2015-11-18 | 2016-01-27 | 广州供电局有限公司 | Current-limiting breaking device |
| CN105958431A (en) * | 2016-06-07 | 2016-09-21 | 广州供电局有限公司 | Protection device for limiting fault current on low voltage side of transformer |
| CN106253253A (en) * | 2016-08-05 | 2016-12-21 | 清华大学 | Direct current current-limiting circuit, direct current current-limiting device and DC transmission system |
| CN107302211A (en) * | 2017-07-31 | 2017-10-27 | 国网电力科学研究院武汉南瑞有限责任公司 | Experiment station's generator protection and operating breaker complexes and its control method |
| CN108448551A (en) * | 2018-03-23 | 2018-08-24 | 西安交通大学 | A kind of exchange current limiter and its current-limiting method |
| CN108462159A (en) * | 2017-12-31 | 2018-08-28 | 国家电网有限公司 | A kind of dc circuit breaker based on the constraint of fault current magnetic circuit |
| CN108599121A (en) * | 2018-04-03 | 2018-09-28 | 中国科学院电工研究所 | A kind of hybrid short-circuit fault current limiter and current-limiting method |
| 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 |
| CN111431153A (en) * | 2020-02-27 | 2020-07-17 | 浙江科技学院 | Economical bridge type fault current limiter |
| CN112072624A (en) * | 2020-09-15 | 2020-12-11 | 国网山东省电力公司济南市历城区供电公司 | Fault current limiter based on iron core type split reactor |
| CN112366668A (en) * | 2020-11-16 | 2021-02-12 | 中国科学院电工研究所 | Low-loss split reactance type current-limiting circuit breaker |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078306A (en) * | 2013-01-09 | 2013-05-01 | 中国科学院电工研究所 | Fault current limiter on basis of combined rapid switch-on switch |
| CN103840442A (en) * | 2014-03-12 | 2014-06-04 | 中国科学院电工研究所 | Short-circuit fault current limiter |
| CN103840442B (en) * | 2014-03-12 | 2016-08-17 | 中国科学院电工研究所 | A kind of short-circuit fault current limiter |
| CN103928214A (en) * | 2014-03-26 | 2014-07-16 | 中国科学院电工研究所 | Double-column double-split reactor applied to current limiter |
| CN103928214B (en) * | 2014-03-26 | 2017-01-04 | 中国科学院电工研究所 | A kind of double split reactor of twin columns being applied to current limiter |
| CN105098737A (en) * | 2014-11-24 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | High-efficiency high-speed current limiting actuator |
| CN105281286A (en) * | 2015-11-18 | 2016-01-27 | 广州供电局有限公司 | Current-limiting breaking device |
| CN105958431A (en) * | 2016-06-07 | 2016-09-21 | 广州供电局有限公司 | Protection device for limiting fault current on low voltage side of transformer |
| CN106253253B (en) * | 2016-08-05 | 2018-11-06 | 清华大学 | Direct current current-limiting circuit, direct current current-limiting device and DC transmission system |
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| CN108599121B (en) * | 2018-04-03 | 2019-09-10 | 中国科学院电工研究所 | A kind of hybrid short-circuit fault current limiter and current-limiting method |
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| CN111431153A (en) * | 2020-02-27 | 2020-07-17 | 浙江科技学院 | Economical bridge type fault current limiter |
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