CN107069680A - A kind of four winding magnetic flux restricted type fault current limiters - Google Patents
A kind of four winding magnetic flux restricted type fault current limiters Download PDFInfo
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- CN107069680A CN107069680A CN201710281845.6A CN201710281845A CN107069680A CN 107069680 A CN107069680 A CN 107069680A CN 201710281845 A CN201710281845 A CN 201710281845A CN 107069680 A CN107069680 A CN 107069680A
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- fault current
- magnetic flux
- phase
- current limiter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
Abstract
The invention discloses a kind of four windings magnetic flux restricted type fault current limiter, including transformer core, three exchange windings and a DC excitation winding as fault current limiter body；Three the exchange windings and DC excitation winding are in the same direction on transformer core, and the wherein phase line that each exchange winding is each accessed in the three-phase line of power network；The DC excitation winding is powered by DC line, by controlling the magnitude of current of DC excitation winding, the transformer fe in-core magnetic flux size is controlled, so as to change the external reactance value of fault current limiter.The present invention can be applied to single feedback distribution line, cover 0~500KV ultra-high-tension power transmission lines.The present invention is under system normal condition, and the present invention is on system transimission power and line current almost without influence, and the loss of voltage is small；When occurring singlephase earth fault, then it quickly can effectively suppress faulted phase current.
Description
Technical field
The present invention relates to a kind of four windings magnetic flux restricted type fault current limiter, belong to Power System Shortcuts protection technique
Field.
Background technology
Constantly lifted with the transmission capacity of power system, the network architecture more sophisticated of power system, power system is each
Short circuit current level in level power network is continuously increased.The capacity of short circuit of some areas has met or exceeded the blocking of breaker
Capacity, and large capcity breaker is limited to manufacture level and high cost, fault current is excessive seriously to threaten power system
Security and stability.
Fault current limiter (Fault Current Limitation, FCL), can effectively limit power network in failure shape
Transient fault electric current under state, on the premise of power grid architecture is not changed, keeps the reliability of electric grid relay protection and existing matches somebody with somebody
Put, improve the stable state security and transient stability of power network, be one of electrical circuitry equipment important during current supergrid is built.
The working mechanism of fault current limiter is：Low ESR is presented when system is normal, reduces system pressure drop, reduction pair
What power network was normally run has influence on minimum degree；When earth fault etc. occurs extremely, high impedance is presented, so that it is short to limit power network
Road levels of current.The main advantage of fault current limiter has：1st, mitigate breaker cut-offs pressure；2nd, line loss is reduced,
Improvement system power-angle stability；Thermally-stabilised limit when the 3rd, avoiding the power equipment from reaching type selecting, increases operation rate.
The classification of the current comparative maturity of fault current limiter has：Mode of resonance fault current limiter, superconductive fault current
Limiter (Chinese Academy of Sciences electrician institute), magnetic switch type fault current limiter (Shanghai Communications University), (Zhejiang is big for New Solid current limiter
Learn).Superconductive fault current limit reaction speed is fast, and loss is low, has the disadvantage that cooling system costliness, material are unstable；Solid-state is limited
Device processed is based on full-controlled device, with quick limitation and pitch capability, but cost is high, loss is big；Mode of resonance failure limiter can be real
Now from triggering, but volume is big, cost is high.
Publication No.：CN 103825262A, patent name is：A kind of fault current limiter of double loop, is employed
The structure of two coupling coils loaded on core limb, the limitation of fault current can be realized to a certain degree.But, the technical scheme
There are problems that, essentially consist in：1) this fault current limiter can only be that (each loop line is triple line for double loop
Road), therefore can not be used for common single back transmission line or cable run, and double-circuit line primarily focus on 220KV or
500KV transmission system, application is more limited to；2) fault current limiter may only deal with three-phase ground failure, to power network
Especially singlephase earth fault common in power distribution network is difficult to have effect；3) cost is higher, and the respective of double-circuit line is mutually both needed to
An iron core composition limit circuit is wanted, thus three-phase needs 3 iron cores altogether, so as to considerably increase cost.Publication No.：
CN104332977A, patent name is：Magnetic flux restricted type fault current limiter, it is using three coupling coils loaded on core limb
Structure, can occur short trouble when volitional check fault current.But the iron core magnetic flux of the current limiter is uncontrollable, in essence
It is really relatively difficult during the impedance percentage of design reactor.
The content of the invention
In view of the deficienciess of the prior art, singlephase earth fault and its iron core can be tackled it is an object of the present invention to provide one kind
The controllable fault current limiter of magnetic flux, it is applied to single-circuit 0~500kV electric lines.
To achieve these goals, the present invention is to realize by the following technical solutions：
A kind of four windings magnetic flux restricted type fault current limiter of the present invention, including it is used as fault current limiter body
Transformer core, a three exchange windings and DC excitation winding；Three exchange windings are wound in the same direction respectively
On transformer core, and the wherein phase line that each winding is each accessed in the three-phase line of power network；The DC excitation
Winding is also powered by equidirectional uniformly around on transformer core, and by DC line, to control transformer fe in-core magnetic
Flux (makes magnetic flux in iron core controllable) by the control to direct current winding current；When one-way line earth fault occurs for power network
When, flux vector produced by non-faulting phase current and faulted phase current can be limited, so that it is guaranteed that failure is mutually electric
Stream realizes fault current limitation in the range of breaker drop-out current.By controlling the magnitude of current of direct current winding effectively to control
Magnetic flux size in iron core, so as to change the external reactance value of fault current limiter.The increase of direct current winding, reduce four around
The design difficulty of group magnetic flux restricted type fault current limiter, and make magnetic flux size in iron core controllable.
The inlet wire point and outlet point of each cross streams winding are also parallel with by-pass switch respectively.The effect of by-pass switch has two：
1) when fault current limiter breaks down, it is possible to use by-pass switch cuts off fault current limiter；2) occurring list
Relay protection can cut off failure phase line after to line-to-ground fault, can now utilize by-pass switch by remaining non-faulting phase
Circuit is bypassed with fault current limiter, it is ensured that the power-balance of non-faulting phase line, so as to maintain the fortune of non-faulting phase line
OK.
Fault current limiter is installed on the cable run of three-phase equilibrium or the head end of overhead transmission line, middle part or end.
The no-load voltage ratio of each cross streams winding is 1：1：1.This can ensure voltage and trend balance of the power network in normal operation, with
And in iron core column magnetic flux and magnetic potential balance.
Above-mentioned DC excitation winding is evenly distributed on iron core.
Above-mentioned transformer core is single-phase double-column formula iron core.
Beneficial effects of the present invention are as follows：The present invention can be applied to single feedback distribution line, cover 0~500KV high pressures
Transmission line of electricity.Under system normal condition, the present invention is on system transimission power and line current almost without influence, the loss of voltage
It is small.When occurring singlephase earth fault, then it quickly can effectively suppress faulted phase current.The restrictive event of four coil fluxs of the present invention
The machine loss for hindering demand limiter is relatively low, and loss is mainly copper loss.Compared to conventional fault demand limiter, the present invention can be
Occurs for failure based on magnetic flux confinement mechanism the moment, realizes timely responding to for fault current, the response time is short, and reply fault current is anti-
Should be rapid.Compared to common magneto-restrictive fault current limiter, the present invention increases direct current winding in structure, so that iron core
Interior magnetic flux is controlled.The three-phase alternating current winding and DC excitation winding of the present invention shares an iron core, and cost is relatively low.
Brief description of the drawings
Fig. 1 is four winding magnetic flux restricted type fault current limiter structure principle charts in embodiment 1；
Fig. 2 is four structure principle charts of the winding magnetic flux restricted type fault current limiter with by-pass switch in embodiment 2；
Fig. 3 is the system access figure for implementing four winding magnetic flux restricted type fault current limiters in 1；
Fig. 4 is the simulated current of A, B, C three-phase line when not accessing system worked well in the case of fault current limiter
Figure；
Fig. 5 for access fault current limiter in the case of system worked well when A, B, C three-phase line simulated current figure；
Fig. 6 is that A, B, C three-phase line during singlephase earth fault occur for system in the case of not accessing fault current limiter
Simulated current figure；
Fig. 7 is the emulation of A, B, C three-phase line is electric during system generation earth fault in the case of access fault current limiter
Flow graph.
Embodiment
To be easy to understand the technical means, the inventive features, the objects and the advantages of the present invention, with reference to
Embodiment, is expanded on further the present invention.
Embodiment 1：
Fig. 1 and Fig. 3 is one embodiment of the present of invention.As shown in figure 1, four winding magnetic flux restricted type failures of the embodiment
Demand limiter, by a transformer core as fault current limiter body, the transformer core is single-phase double-column formula iron
Core.Three-phase alternating current winding A, B and C are provided with transformer core to be used to be connected with the three-phase line of power network, and wherein A phase windings connect
Enter the A phase lines of power network, B phase windings access the B phase lines of power network, C phase windings access the C phase lines of power network, each phase winding with
Identical direction is on transformer core.
As shown in figure 3, when one-way line earth fault such as C phase lines generation earth fault occurs for power network, then A can be passed through
Phase current Ia and B phase current Ib is limited C phase currents Ic through magnetic flux produced by A phase windings, B phase windings, so that it is guaranteed that Ic
In the range of breaker drop-out current, the limitation to faulted phase current is realized.
The no-load voltage ratio of each phase winding is 1：1：1, it is ensured that voltage and trend balance of the power network in normal operation, and iron core column
The balance of interior magnetic flux and magnetic potential.Fault current limiter be installed on the head end of the cable run of three-phase equilibrium or overhead transmission line, in
Portion or end.
Embodiment 2：
Fig. 2 gives second embodiment of the present invention.The difference of the embodiment and one embodiment be it is each around
The inlet wire point and outlet point of group are also parallel with by-pass switch ka, kb and kc respectively.The effect of by-pass switch has two：1) in failure electricity
When stream limiter breaks down, it is possible to use by-pass switch cuts off fault current limiter；2) occurring one-way line ground connection
Relay protection can cut off failure phase line after failure, can now utilize by-pass switch by remaining non-faulting phase line and failure
Demand limiter is bypassed, it is ensured that the power-balance of non-faulting phase line, so as to maintain the operation of non-faulting phase line.
Fig. 4 to Fig. 7 gives the simulated current figure of the implementation result of the present invention.Fig. 4 shows do not accessing the four of the present invention
Three-phase current instantaneous value when power network is normally run during winding magnetic flux restricted type fault current limiter, its amplitude is set as
148A.Fig. 5 shows three when power network is normally run in the four winding magnetic flux restricted type fault current limiter of the access present invention
Phase current instantaneous value, amplitude is set as 147A.It can be seen that, in power network normal work, four winding magnetic flux restricted types event of the invention
Hinder the access of demand limiter to system power and convey power substantially without influence
Single-phase earthing occurs for power network when Fig. 6 shows not access the four winding magnetic flux restricted type fault current limiter of the present invention
Three-phase current instantaneous value during failure operation, wherein A phase currents are 3482A, and B, C phase current are 148A, it can be seen that fault current
It is larger.Fig. 7 shows that singlephase earth fault occurs for power network during the four winding magnetic flux restricted type fault current limiter of the access present invention
Three-phase current instantaneous value during operation, wherein A phase currents are 423A, and B, C phase current are 148A.Therefore, four windings of the invention
Magnetic flux restricted type fault current limiter plays larger inhibitory action to the fault current of singlephase earth fault really.
It is difficult to compared to conventional fault demand limiter in performance indications such as cost, volume, system complexity, triggering speed
Take into account, the present invention proposes that biphase current is produced in addition when earth fault occurs for a certain phase line according to balance of flux principle
Magnetic flux is realized to the short circuit current flow of failure phase and limited.The fault current limiter equipment knot of the four winding magnetic flux restricted types of the present invention
Structure is simple, it is easy to which design is realized, can take into account the performance indications such as cost, volume, system complexity, triggering speed.
The present invention, on system transimission power and line current substantially without influence, can occur under system normal condition
During singlephase earth fault, it can quickly and effectively suppress faulted phase current.Magnetic flux binding character fault current limiter in the present invention
Machine loss is relatively low, and loss is mainly copper loss.Compared to conventional fault demand limiter, in the present invention fault current limiter therefore
Moment occurs for barrier, timely responding to for fault current can be achieved, its response time is short, and reply fault current is swift in response.Compared to general
Logical magneto-restrictive fault current limiter, the present invention increases direct current winding in structure, so that magnetic flux is controlled in iron core.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
1. a kind of four windings magnetic flux restricted type fault current limiter, it is characterised in that including being used as fault current limiter sheet
The transformer core of body, three exchange windings and a DC excitation winding；
Three the exchange windings and DC excitation winding are in the same direction on transformer core, and each exchange
The wherein phase line that winding is each accessed in the three-phase line of power network；
The DC excitation winding is powered by DC line, by controlling the magnitude of current of DC excitation winding, controls the transformation
Magnetic flux size in device iron core, so as to change the external reactance value of fault current limiter；
When one-way line earth fault occurs for power network, flux vector produced by non-faulting phase current and can be to failure phase
Electric current is limited, so that it is guaranteed that faulted phase current realizes fault current limitation in the range of breaker drop-out current.
2. four windings magnetic flux restricted type fault current limiter according to claim 1, it is characterised in that each cross streams around
The inlet wire point and outlet point of group are also parallel with by-pass switch respectively.
3. four windings magnetic flux restricted type fault current limiter according to claim 1, it is characterised in that fault current is limited
Device processed is installed on the cable run of three-phase equilibrium or the head end of overhead transmission line, middle part or end.
4. four windings magnetic flux restricted type fault current limiter according to claim 1, it is characterised in that each cross streams around
The no-load voltage ratio of group is 1：1：1.
5. four windings magnetic flux restricted type fault current limiter according to claim 1, it is characterised in that DC excitation around
Group is evenly distributed on iron core.
6. four windings magnetic flux restricted type fault current limiter according to claim 1, it is characterised in that the transformer
Iron core is single-phase double-column formula iron core.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710281845.6A CN107069680A (en) | 2017-04-26 | 2017-04-26 | A kind of four winding magnetic flux restricted type fault current limiters |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710281845.6A CN107069680A (en) | 2017-04-26 | 2017-04-26 | A kind of four winding magnetic flux restricted type fault current limiters |
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| CN107069680A true CN107069680A (en) | 2017-08-18 |
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| CN201710281845.6A Pending CN107069680A (en) | 2017-04-26 | 2017-04-26 | A kind of four winding magnetic flux restricted type fault current limiters |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000132247A (en) * | 1998-10-20 | 2000-05-12 | Haku Shu | Superconduction current controller |
| CN1635641A (en) * | 2003-12-26 | 2005-07-06 | 北京云电英纳超导电缆有限公司 | Superconducting saturable core fault current limiter |
| 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 |
| CN104332977A (en) * | 2014-10-15 | 2015-02-04 | 南京南瑞集团公司 | Magnetic flux constraint three-phase fault current limiter |
-
2017
- 2017-04-26 CN CN201710281845.6A patent/CN107069680A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000132247A (en) * | 1998-10-20 | 2000-05-12 | Haku Shu | Superconduction current controller |
| CN1635641A (en) * | 2003-12-26 | 2005-07-06 | 北京云电英纳超导电缆有限公司 | Superconducting saturable core fault current limiter |
| 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 |
| CN104332977A (en) * | 2014-10-15 | 2015-02-04 | 南京南瑞集团公司 | Magnetic flux constraint three-phase fault current limiter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170818 |
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