CN102790382B - Current limited soft connecting/disconnecting device - Google Patents
Current limited soft connecting/disconnecting device Download PDFInfo
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- CN102790382B CN102790382B CN201210252205.XA CN201210252205A CN102790382B CN 102790382 B CN102790382 B CN 102790382B CN 201210252205 A CN201210252205 A CN 201210252205A CN 102790382 B CN102790382 B CN 102790382B
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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 the fast development of national economy, society constantly increases the demand of electric power, drive the development of electric power system, single-machine capacity and station capacity, substation capacity, city and center of industry load constantly increase, just make between electric power system interconnected, the short circuit current level in electrical network at different levels improves constantly.However, general way remains and adopts circuit breaker to cut-off faulty line, on the one hand protects power equipment, also avoids on the other hand because busbar voltage is too low and cause adverse effect to user.Along with improving constantly of short circuit current level, what just need to improve constantly circuit breaker cut-offs capacity.For this reason, researcher has carried out large quantifier elimination to aspects such as the electromagnetism of circuit breaker and mechanical structure, contact material, arc-extinguishing mediums, the capacity that cut-offs of Technologies for AC Low Voltage Circuit Breakers reaches 125kA, and the capacity that cut-offs being applied to the AC circuit breaker of the high pressure such as 220kV, 330kV, 500kV and extra-high voltage Force system reaches 75kA.But that improves circuit breaker further cut-offs capacity, not only more and more difficult technically, and cost also will increase substantially.In addition, circuit breaker can not directly in parallelly use.Therefore, the off-capacity of cut-offfing of electric network fault short circuit current has more and more become the important bottleneck problem limiting power network development.
That considers circuit breaker cut-offs off-capacity, and in recent years, the method for multiple restriction grid short circuit electric current also started to be concerned and to apply.The method of restriction grid short circuit electric current mainly contains: (1) improves line voltage; (2) untie electrical network to connect, comprise the connection disconnected between some transmission lines or double-bus.When there is short trouble, back-up breaker can be closed and ensure power supply; (3) short-circuit of power transformer impedance is improved; (4) current limiting reactor is installed; (5) fault current limiter is installed.But the cost improving line voltage grade is too high; Untie the method that electrical network connects, the power supply reliability of electrical network can be caused greatly to reduce; Adopting high-impedance transformer or current limiting reactor to be current limiting short-circuit currents is the most also the most ripe scheme, but needs consume reactive power and be unfavorable for Power Network Transient Stability.In order to eliminate the shortcoming of current limiting reactor, researcher proposes this solution of fault current limiter.Fault current limiter under normal operation impedance is very little, and when short trouble, impedance becomes large and current limliting.Fault current limiter is divided into superconduct and non-super conductivity type two kinds.Superconduct fault current limiter is divided into the structural shapes such as resistor-type, saturable core type, bridge circuit type, induction shield type, and non-super conductivity type fault current limiter is divided into bridge circuit type, series resonance-type, Parallel Resonant, saturated iron core, paralleling switch to throw the structural shapes such as reactance type.Superconduct and non-super conductivity type fault current limiter all exist that cost is high, running wastage is large or the shortcoming such as reliability is low, face very large challenge.
Consider existing high-voltage large-capacity circuit breaker cut-off off-capacity, cannot be directly in parallel; superconduct and non-super conductivity type fault current limiter technology still immature; if large capcity breaker can be constructed by a kind of mode be dirt cheap current, will there is very positive meaning.Chinese patent 200710052947.7 discloses a kind of parallel circuit breaker, be made up of 2 ~ 4 branch circuit parallel connections, every bar branch road comprises inductance coil and the circuit breaker of series connection, the inductance coil equal turn numbers of each branch road, and the magnetic flux produced in each magnetic circuit of iron core is contrary between two.This patent adopts 2 ~ 4 identical circuit breakers cut-offfing capacity to be in parallel, and realizes cut-offfing big current.But this circuit breaker is in interrupting process, fault current is 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 parallel circuit breaker disclosed in this patent adopts is also more, the capacity that cut-offs of circuit breaker declines not obvious.
Summary of the invention
The object of the invention is to the shortcoming overcoming regular circuit breakers and current limiting reactor, propose a kind of to there is current-limiting function and the soft soft breaking device of current limliting cut-offfing function simultaneously.First the single branch road of close coupling double winding reactor first connects with circuit breaker by the present invention, then this series arm again with another branch circuit parallel connection of this close coupling double winding reactor, by cut-off that capacity is down to capacity of short circuit 50% of circuit breaker.Meanwhile, after this circuit breaker disconnects, the impedance of reactor increases sharply, and another circuit breaker can no longer need to disconnect like this, thus realizes cut-offfing the soft of faulty line.The soft breaking device of current limliting that the present invention proposes, implements flexibly, easily, can be applicable in the network system of various different electric pressure, different capabilities.
To achieve these goals, the technical solution used in the present invention is as follows:
The soft breaking device of current limliting of the present invention is by close coupling double winding reactor, the first circuit breaker, the second circuit breaker or add capacitor and form, and described close coupling double winding reactor can be one or two.Close coupling double winding reactor is made up of the closed of the first winding, the second winding and rectangle or semi-closed iron core, and the first described winding is identical with the number of turn of the second winding, is wound on two stem stems of described iron core in inverse parallel mode.
The present invention can adopt following several technical scheme:
First winding and first circuit breaker of close coupling double winding reactor are first connected, then the first winding of close coupling double winding reactor and the second winding parallel, last close coupling double winding reactor and the series connection of the second circuit breaker.
First winding and first circuit breaker of close coupling double winding reactor are first connected, then the first winding of close coupling double winding reactor and the second winding parallel, and and capacitor in parallel, last close coupling double winding reactor and the series connection of the second circuit breaker.
Two close coupling double winding reactors adopt two-level concatenation connected mode, and the first winding and first circuit breaker of secondary close coupling double winding reactor are first connected, and then carry out parallel connection with the second winding of secondary close coupling double winding reactor; Next, first windings in series of whole secondary close coupling double winding reactor and one-level close coupling double winding reactor, then parallel connection is carried out with the second winding of one-level close coupling double winding reactor, afterbody close coupling double winding reactor and the series connection of the second circuit breaker.
Two close coupling double winding reactors adopt two-level concatenation connected mode, can also be: the first winding and first circuit breaker of secondary close coupling double winding reactor are first connected, then carry out parallel connection with the second winding of secondary close coupling double winding reactor; Next, first windings in series of whole secondary close coupling double winding reactor and one-level close coupling double winding reactor, then parallel connection is carried out with the second winding of one-level close coupling double winding reactor, and and capacitor parallel connection, afterbody close coupling double winding reactor and the series connection of the second circuit breaker.
The soft breaking device of this current limliting shows as Low ESR when normal operation, when system burst short circuit because the first circuit breaker cut-offs, total reactance value of device increases sharply, the short circuit current of system is reduced to nominal current level, such second circuit breaker can no longer need to disconnect, thus realizes cut-offfing the soft of faulty line.If system there occurs permanent fault, the second circuit breaker is also easy to disconnect.The reactor that the soft breaking device of current limliting of the present invention adopts is 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 by the impedance variation of close coupling double winding reactor self in circuit breaker interrupting process and cut-offs function, does not need additional control system.Therefore, the soft breaking device structure of this current limliting simply, easily realizes, and reliability is high.
2) the stable state impact of the soft breaking device of current limliting of the present invention on electrical network is little.When normally running, the steady state impedance of reactor is very little, can not increase System Reactive Power, and steady-state behaviour is better than existing current limiting reactor.
3) the present invention can be used for constructing jumbo circuit breaker.What the mode adopting close coupling double winding reactor single branch road to connect with circuit breaker reduced circuit breaker cut-offs capacity, reduces technical difficulty and the cost of Large circuit breakers making, more has the market competitiveness.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Fig. 1 is the circuit of the soft breaking device of the specific embodiment of the invention 1 current limliting when steady operation and magnetic circuit schematic diagram;
Fig. 2 is the circuit of the soft breaking device of the specific embodiment of the invention 1 current limliting when short circuit and magnetic circuit schematic diagram;
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 limliting;
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 limliting;
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 limliting.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Close coupling double winding reactor is applied to and cut-offs the soft of faulty line by the present invention, and namely when accidental short trouble occurs system, faulty line can not need to cut-off and can ensure the normal operation of non-fault line.
Figure 1 shows that the circuit of the soft breaking device of the embodiment of the present invention 1 current limliting when steady operation and magnetic circuit schematic diagram.The soft breaking device of described current limliting is by the first winding L 1, second winding L 2, rectangle closes or semi-closed iron core forms close coupling double winding reactor, and the first circuit breaker K1 and the second circuit breaker K2 forms.In described close coupling double winding reactor, the first winding L 1 is identical with the number of turn of the second winding L 2, is wound on two stem stems of described iron core in inverse parallel mode.First winding L 1 elder generation of close coupling double winding reactor and the first circuit breaker K1 connect, and then in parallel with the second winding L 2, and last whole close coupling double winding reactor again with the second circuit breaker K2 connects.When normally working, the first circuit breaker K1 and the second circuit breaker K2 is in closure state, and the first winding L 1 is identical with the electric current that the second winding L 2 is passed through, and the magnetic flux equal and opposite in direction of generation, direction is contrary.The magnetic flux produced when normally working due to this iron core reactor is mainly leakage flux, and leakage inductance is relatively very little, therefore very little to electric network influencing.In addition, because winding iron core magnetic flux when normally running of this close coupling double winding reactor is very little, the ampacity of the first winding L 1 and the second winding L 2 is the half of system power, and therefore, the first circuit breaker K1 can select to cut-off the circuit breaker that capacity is system short circuit capacity 50%.Meanwhile, the iron loss that this close coupling double winding reactor is total and copper loss all can be controlled in lower level.
Figure 2 shows that the ruuning situation of the soft breaking device of the embodiment of the present invention 1 current limliting when system is short-circuited fault.As mentioned above, when normally running, the ampacity of the first circuit breaker K1 is the system power of 1/2.When short trouble occurs, pass through parameter tuning, first circuit breaker K1 is first disconnected, the magnetic flux of reactor will mainly pass through from iron core, and the reactance of reactor can increase rapidly, thus is limited by short circuit current, select the reactance value of appropriate design first winding L 1 and the second winding L 2, can be restricted near rated current by short circuit current, such second circuit breaker can not need to disconnect, thus realizes cut-offfing the soft of faulty line.
As shown in Figure 3, be the equivalent circuit diagram of the soft breaking device of embodiment 1 current limliting.The self-induction of close coupling double winding reactor two winding L 1 and L2 is respectively L
1and L
2, mutual inductance is M.Because the double winding number of turn is identical, Same Name of Ends is contrary, therefore L
1=L
2, mutual inductance M and L
1and L
2closely; First winding L 1 elder generation of close coupling double winding reactor and the first circuit breaker K1 connect, and then in parallel with the second winding L 2, and last whole close coupling double winding reactor again with the second circuit breaker K2 connects.When system is normally run, the reactance value of reactor
be a very little numerical value, very little to systematic influence, the ampacity of the first circuit breaker K1 is 50% of transmission line electric current.When system is short-circuited fault, by the parameter tuning of circuit breaker, the first circuit breaker K1 is first cut-off, the reactance value L '=L of reactor
2, the short circuit current of system declines rapidly.By selecting suitable design parameter, short circuit current can be made to be reduced to value close to specified running current, therefore, it is non-permanent fault if phylogenetic, only need disconnection first circuit breaker K1, the second circuit breaker K2 can not need to disconnect, thus realizes cut-offfing the soft of faulty line.If system there occurs permanent short trouble, due to short circuit current and specified running current size close, the second circuit breaker K2 can be easy to disconnect.Close coupling double winding reactor design all adopts iron core or half core structure, reaches above-mentioned design objective than being easier to.
As shown in Figure 4, be the equivalent circuit diagram of the soft breaking device of embodiment 2 Parallel Resonant current limliting.Identical with embodiment 1, the self-induction of close coupling double winding reactor two winding L 1 and L2 is respectively L
1and L
2, mutual inductance is M.Because the double winding number of turn is identical, Same Name of Ends is contrary, therefore L
1=L
2, mutual inductance M and L
1and L
2closely; First winding L 1 elder generation of close coupling double winding reactor and the first circuit breaker K1 connect, and then in parallel with the second winding L 2; As different from Example 1: close coupling double winding first and after capacitor C parallel connection again with the second circuit breaker K2 connect.When system is normally run, the reactance value of reactor
be a very little numerical value, system impedance is
by appropriate design, make ω
2lC < < 1.Therefore, when system is normally run, system power will mainly flow through from reactor, and the ampacity of the first circuit breaker K1 is 50% of transmission line electric current.When system is short-circuited fault, by the parameter tuning of circuit breaker, the first circuit breaker K1 is first cut-off, after the first circuit breaker K1 cut-offs, the reactance value L '=L of reactor
2, by appropriate design, make ω
2l ' C ≈ 1, namely utilize the principle of parallel resonance to be that the total impedance of circuit increases sharply, short circuit current can decline rapidly.By selecting suitable design parameter, short circuit current can be made to be reduced to value close to specified running current, therefore, it is non-permanent fault if phylogenetic, only need disconnection first circuit breaker K1, the second circuit breaker K2 can not need to disconnect, thus realizes cut-offfing the soft of faulty line.If system there occurs permanent short trouble, due to short circuit current and specified running current size close, the second circuit breaker K2 can be easy to disconnect.Close coupling double winding reactor design all adopts iron core or half core structure, reaches above-mentioned design objective than being easier to.
As shown in Figure 5, the equivalent circuit diagram of the soft breaking device of the embodiment of the present invention 3 two-level concatenation structure current limliting.The self-induction of one-level close coupling double winding reactor two winding L 1 and L2 is respectively L
1and L
2, mutual inductance is M, L
1=L
2; Structure and the one-level reactor of secondary close coupling double winding reactor are similar, and the mutual inductance of the first winding L 11 and the second winding L 12 is M
1, self-induction L
11=L
12; First winding L 11 elder generation of secondary close coupling double winding reactor and the first circuit breaker K1 connect, and then in parallel with the second winding L 12; First winding L 1 of secondary close coupling double winding reactor and one-level close coupling double winding reactor is connected, and then with the second winding L 2 is in parallel; Afterbody close coupling double winding reactor is connected with the second circuit breaker K2; The reactance value of reactor when normal work
very little to systematic influence; When system jam short circuit, the capacity that cut-offs of the first circuit breaker is short circuit current 25%, and the reactance value of reactor changes,
by appropriate design L
1and L
2, L
12and L
22numerical value, L ' can be made close with rated impedance, such second circuit breaker K2 can no longer need disconnect, thus realize the soft of faulty line is cut-off.If system there occurs permanent short trouble, due to short circuit current and specified running current size close, the second circuit breaker K2 can be easy to disconnect.One-level close coupling double winding reactor and secondary close coupling double winding reactor design all can adopt iron core or half core structure, reach above-mentioned design objective than being easier to.
As shown in Figure 6, the equivalent circuit diagram of the soft breaking device of the embodiment of the present invention 4 Parallel Resonant two-level concatenation structure current limliting.Identical with embodiment 3: the self-induction of one-level close coupling double winding reactor two winding L 1 and L2 is respectively L
1and L
2, mutual inductance is M, L
1=L
2; Structure and the one-level reactor of secondary close coupling double winding reactor are similar, and the mutual inductance of the first winding L 11 and the second winding L 12 is M
1, self-induction L
11=L
12; First winding L 11 elder generation of secondary close coupling double winding reactor and the first circuit breaker K1 connect, and then in parallel with the second winding L 12; First winding L 1 of secondary close coupling double winding reactor and one-level close coupling double winding reactor is connected, and then with the second winding L 2 is in parallel.As different from Example 3: one-level close coupling double winding reactor first and after capacitor C parallel connection again with the second circuit breaker K2 connect.The reactance value of close coupling reactor when normal work
be a very little numerical value; System impedance is
by appropriate design, make ω
2lC < < 1 is very little to systematic influence; When system jam short circuit, cut-off that capacity is short circuit current 25% of the first circuit breaker, the reactance value of reactor changes,
system impedance is
by appropriate design L
1and L
2, L
12and L
22, and the numerical value of capacitor C, can ω be made
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 disconnect, thus realizes cut-offfing the soft of faulty line.If system there occurs permanent short trouble, due to short circuit current and specified running current size close, the second circuit breaker K2 can be easy to disconnect.One-level reactor in current limiting circuit breaker and secondary reactor design also can adopt iron core or half core structure, reach above-mentioned design objective than being easier to.
Claims (3)
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, the first circuit breaker (K1), the second circuit breaker (K2) and capacitor (C); Described close coupling double winding reactor is made up of the closed of the first winding (L1), the second winding (L2) and rectangle or semi-closed iron core, described the first winding (L1) is identical with the number of turn of the second winding (L2), is wound on two stem stems of described iron core in inverse parallel mode; First winding (L1) elder generation of described close coupling double winding reactor and the first circuit breaker (K1) series connection, first winding (L1) of then described close coupling double winding reactor and second winding (L2) of close coupling double winding reactor in parallel, last described close coupling double winding reactor first and after capacitor (C) parallel connection again with the second circuit breaker (K2) connect; The ampacity of the first circuit breaker (K1) is 50% of transmission line electric current.
2. the soft breaking device of current limliting according to claim 1, is characterized in that the soft breaking device of described current limliting is made up of two close coupling double winding reactors, the first circuit breaker (K1) and the second circuit breaker (K2); Close coupling double winding reactor described in two adopts two-level concatenation mode to connect: the first winding (L11) and first circuit breaker (K1) of secondary close coupling double winding reactor are first connected, first winding (L11) of then described secondary close coupling double winding reactor and the 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, then with the second winding (L2) is in parallel, last described one-level close coupling double winding reactor and the second circuit breaker (K2) series connection; Cut-off that capacity is short circuit current 25% of first circuit breaker (K1).
3. the soft breaking device of current limliting according to claim 1, is characterized in that the soft breaking device of described current limliting is made up of two close coupling double winding reactors, the first circuit breaker (K1), the second circuit breaker (K2) and capacitor (C); Two close coupling double winding reactors adopt two-level concatenation mode to connect; First winding (L11) and first circuit breaker (K1) of described secondary close coupling double winding reactor are first connected, first winding (L11) of then described secondary close coupling double winding reactor and the second winding (L12) parallel connection; Described secondary close coupling double winding reactor is in parallel with described the second winding (L2) after connecting with first winding (L1) of one-level close coupling double winding reactor, and in parallel with capacitor (C), last described one-level close coupling double winding reactor and the second circuit breaker (K2) series connection; Cut-off that capacity is short circuit current 25% of first circuit breaker (K1).
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| CN201210252205.XA CN102790382B (en) | 2012-07-19 | 2012-07-19 | Current limited soft connecting/disconnecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210252205.XA CN102790382B (en) | 2012-07-19 | 2012-07-19 | Current limited soft connecting/disconnecting device |
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| CN102790382A CN102790382A (en) | 2012-11-21 |
| CN102790382B true CN102790382B (en) | 2014-12-24 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103078306B (en) * | 2013-01-09 | 2015-01-21 | 中国科学院电工研究所 | Fault current limiter on basis of combined rapid switch-on switch |
| 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 |
| 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 |
| 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 |
| 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 |
| CN108448551B (en) * | 2018-03-23 | 2020-01-14 | 西安交通大学 | Alternating current limiter and current limiting method thereof |
| 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 |
| 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 |
| CN112072624B (en) * | 2020-09-15 | 2022-11-18 | 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 |
| CN112366668B (en) * | 2020-11-16 | 2022-08-09 | 中国科学院电工研究所 | Low-loss split reactance type current-limiting circuit breaker |
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| CN102790382A (en) | 2012-11-21 |
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