CN108767833A - Single-phase magneto-restrictive fault current limiter - Google Patents
Single-phase magneto-restrictive fault current limiter Download PDFInfo
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- CN108767833A CN108767833A CN201810838749.1A CN201810838749A CN108767833A CN 108767833 A CN108767833 A CN 108767833A CN 201810838749 A CN201810838749 A CN 201810838749A CN 108767833 A CN108767833 A CN 108767833A
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- fault current
- current limiter
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- iron core
- winding
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- 238000004804 winding Methods 0.000 claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000004907 flux Effects 0.000 claims abstract description 13
- 238000005516 engineering process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of single-phase magneto-restrictive fault current limiter, including iron core, the winding of two-way concatenation is full of on iron core, the magnetic flux that two-way winding generates in the core cancels out each other to zero, wherein the both ends of winding and being connected to by-pass switch all the way.In nominal situation, by-pass switch is cut-off the present invention, and the magnetic flux that two-way winding generates in the core is cancelled out each other to zero, and single-phase magneto-restrictive fault current limiter is on transimission power and line current without influence；When short trouble occurs, by quick-make by-pass switch, the magnetic flux cancelled out each other in iron core is made to revert to rated flux, to generate rated impedance and realize the limitations of fault current levels.
Description
Technical field
The present invention relates to a kind of single-phase magneto-restrictive fault current limiters, belong to electrical technology field.
Background technology
With the rapid development of urban construction, the conveying of the increase of load and load density in power grid, electric system is held
Amount is constantly promoted, the network architecture more sophisticated of electric system, leads to short circuit current level in electric system power grids at different levels not
It is disconnected to increase.The capacity of short circuit of some areas has reached the Breaking capacity of even more than breaker, and large capcity breaker is limited
In manufacture level and high cost, the excessive safety for having seriously threatened power grid of fault current.
Fault current limiter（Fault Current Limitation, FCL）, under the premise of not changing power grid architecture
The transient fault levels of current under grid failure state can be effectively limited, while power grid normal steady state operating condition is influenced more
Slightly, it is one of the important electrical circuitry equipment of current electric grid development.
The working mechanism of fault current limiter is：Low ESR is presented when system is normal, reduces to power grid normal operation
Influence minimum degree；When earth fault etc. occurs extremely, high impedance is presented, to be constituted to grid short circuit levels of current
Limitation to the greatest extent.The main advantage of fault current limiter has：1, mitigate breaker cut-offs pressure；2, circuit damage is reduced
Consumption improves system power-angle stability；Thermostabilization limit when 3, power equipment being avoided to reach 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, magnetic switch type fault current limiter, New Solid current limiter.Magnetic switch type fault current limiter is to use
Alternating current-direct current coil is with the structure of iron core nesting, and DC current makes iron core be saturated when normal, when failure using cut-off coil limit therefore
Hinder electric current, advantage is that loss is low, the disadvantage is that of high cost, volume is big, degaussing speed is slow, big, poor reliability of cut-offfing difficulty.Superconduction event
It is fast to hinder demand limiter reaction speed, loss is low, the disadvantage is that cooling system is expensive, material is unstable；Solid-state limiter is based on complete
Device is controlled, there is quickly limitation and pitch capability, but cost is high, loss is big；Mode of resonance failure limiter uses inductance and capacitance
Cascaded structure, shunt capacitance carries out current limliting, it can be achieved that from triggering when failure, but volume is big, cost is high.
Invention content
The present invention provides a kind of single-phase magneto-restrictive fault current limiters, are bypassed when using failure（Bypass is closed to open
It closes）Vice-side winding carries out the mechanism of fault current limitation, solves existing single phase magnetic circuit control type fault current limiter and utilizes and cut-offs
The shortcomings of big difficulty, poor reliability are cut-off existing for this mode of coil fault current limiting, while solving existing failure electricity
The problems such as volume and cost height, current limliting speed being primarily present in stream limiter are slowly, loss is big.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：
Single-phase magneto-restrictive fault current limiter, including iron core are full of the winding of two-way concatenation on iron core, and two-way winding is in iron
The magnetic flux generated in core is cancelled out each other to zero, wherein the both ends of winding and being connected to by-pass switch all the way.
The no-load voltage ratio of two windings is 1:1.
Iron core is four-column type iron core.
For two-way winding rotating around on two opposite stems, the coiling direction of two windings is identical.
Along current direction, by-pass switch and second winding simultaneously connect.
Two windings respectively and connect there are two arrester.
The advantageous effect that the present invention is reached：In nominal situation, by-pass switch is cut-off the present invention, and two-way winding is in iron core
The magnetic flux of middle generation is cancelled out each other to zero, and single-phase magneto-restrictive fault current limiter is to transimission power and line current without shadow
It rings；When short trouble occurs, by quick-make by-pass switch, the magnetic flux cancelled out each other in iron core is made to revert to rated flux,
To generate rated impedance and realize the limitations of fault current levels, solves existing single phase magnetic circuit control type fault current limiter profit
With cut-offfing the shortcomings of cut-offfing big difficulty, poor reliability existing for coil fault current limiting this mode, while solving existing
The problems such as volume and cost that are primarily present in fault current limiter are high, current limliting speed is slow, loss is big.
Description of the drawings
Fig. 1 is the structure principle chart of the present invention；
Fig. 2 is the simulation model figure of the present invention；
Short circuit current analogous diagram when Fig. 3 is power grid short trouble when not having fault current limiter access；
Short circuit current analogous diagram when short trouble occurs for power grid when Fig. 4 is present invention access.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, single-phase magneto-restrictive fault current limiter, including iron core, two-way winding（I.e. in figurew1 Hew2）And by-pass switch（I.e. in figurek 1）.
Iron core uses four-column type iron core, i.e. iron core in single-phase reactor, and the no-load voltage ratio of two windings is 1:1, two-way winding
Concatenation, and rotating around on two opposite stems（It is wound in Fig. 1 on two stems in left and right）, the coiling direction of two windings
Identical, the magnetic flux that two-way winding generates in the core is cancelled out each other to zero, and it is single-phase that two free ends of two-way winding seal in power grid
Circuit, along current direction, it is primary side winding to define first, electric current and flow through, and it is vice-side winding that second, which flows through, and bypass is opened
It closes and vice-side winding and connects.
In nominal situation, by-pass switch is cut-off, and the magnetic flux that two-way winding generates in the core is cancelled out each other to zero, above-mentioned
Fault current limiter seals in the impedance of power grid close to zero, the only leakage reactance of equipment, on transimission power and line current without influence；
Judge that short trouble occurs makes vice-side winding Quick side by quick-make by-pass switch based on failure Fast Identification technology
Road, there is only magnetic fluxs caused by primary side winding in iron core, to generate certain current-limiting impedance in sealing in circuit.
The shutdown of above-mentioned by-pass switch will produce switching overvoltage, and two windings respectively and connect that there are two arresters, i.e.,w1
And an arrester is connect,w2 and an arrester is connect, to absorption operation overvoltage.
Above-mentioned fault current limiter loaded on its fault current levels is limited on uniline, can also install three it is identical
Above-mentioned fault current limiter is in limiting fault current levels on three-phase line.
It is illustrated in figure 2 the simulation model of fault current limiter, simulation parameter is：Power grid is 10kV, short-circuit impedance
0.02 ohm；Former secondary voltage no-load voltage ratio is 5.774kV/5.774kV, short-circuit impedance 4%, capacity 200kVA/3；Line impedance is
10 ohm, load impedance is 100 ohm.
It according to above-mentioned fault current limiter, since magnetic flux is offset, seals in impedance and there was only leakage reactance, to line when stable state
Road electric current does not influence；Fault current levels are inhibited when failure, and short circuit current level is 1.409kA when not accessing FCL, is connect
Short circuit current level is 0.611kA when entering FCL, and it is be not introduced into FCL fault currents 43.36%, current limliting to introduce FCL fault currents
It is with obvious effects, it is as shown in Figure 3 and Figure 4 respectively.
In conclusion above-mentioned fault current limiter, bypasses when using failure（It is closed）Vice-side winding carries out fault current
The mechanism of limitation solves existing single phase magnetic circuit control type fault current limiter by cut-offfing coil fault current limiting in the way of this
Existing the shortcomings of cut-offfing big difficulty, poor reliability, while solving the volume being primarily present in existing fault current limiter
And the problems such as cost is high, current limliting speed is slow, loss is big.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. single-phase magneto-restrictive fault current limiter, it is characterised in that：Including iron core, be full of on iron core two-way concatenation around
Group, the magnetic flux that two-way winding generates in the core are cancelled out each other to zero, wherein the both ends of winding and being connected to by-pass switch all the way.
2. single-phase magneto-restrictive fault current limiter according to claim 1, it is characterised in that：The no-load voltage ratio of two windings
It is 1:1.
3. single-phase magneto-restrictive fault current limiter according to claim 1, it is characterised in that：Iron core is four-column type iron
Core.
4. single-phase magneto-restrictive fault current limiter according to claim 3, it is characterised in that：Two-way winding rotating around
On two opposite stems, the coiling direction of two windings is identical.
5. single-phase magneto-restrictive fault current limiter according to claim 1, it is characterised in that：It is other along current direction
Way switch and second winding simultaneously connect.
6. single-phase magneto-restrictive fault current limiter according to claim 1, it is characterised in that：Two windings difference are simultaneously
Arrester there are two connecing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810838749.1A CN108767833A (en) | 2018-07-27 | 2018-07-27 | Single-phase magneto-restrictive fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810838749.1A CN108767833A (en) | 2018-07-27 | 2018-07-27 | Single-phase magneto-restrictive fault current limiter |
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| Publication Number | Publication Date |
|---|---|
| CN108767833A true CN108767833A (en) | 2018-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810838749.1A Pending CN108767833A (en) | 2018-07-27 | 2018-07-27 | Single-phase magneto-restrictive fault current limiter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110517869A (en) * | 2019-07-11 | 2019-11-29 | 西安交通大学 | The circuit topology and control method of flexible adjustable transformer neutral point ground connection |
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| JP2004274863A (en) * | 2003-03-07 | 2004-09-30 | Kansai Electric Power Co Inc:The | Current limiter |
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| CN101022217A (en) * | 2007-01-05 | 2007-08-22 | 清华大学 | Fault current limiter DC control system |
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| 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 |
| CN103647264A (en) * | 2013-12-19 | 2014-03-19 | 特变电工沈阳变压器集团有限公司 | Strong coupled type power failure 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 |
| CN107069680A (en) * | 2017-04-26 | 2017-08-18 | 国电南瑞科技股份有限公司 | A kind of four winding magnetic flux restricted type fault current limiters |
| CN206992686U (en) * | 2017-05-15 | 2018-02-09 | 东南大学 | A kind of single-phase saturable core type fault current limiter |
| CN108270221A (en) * | 2018-03-13 | 2018-07-10 | 国网福建石狮市供电有限公司 | A kind of appliance load harmonic treating apparatus |
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-
2018
- 2018-07-27 CN CN201810838749.1A patent/CN108767833A/en active Pending
Patent Citations (17)
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| JPH1066254A (en) * | 1996-08-09 | 1998-03-06 | Tokyo Electric Power Co Inc:The | Current-limiting reactor with discharge device and control method therefor |
| JP2004274863A (en) * | 2003-03-07 | 2004-09-30 | Kansai Electric Power Co Inc:The | Current limiter |
| CN1595583A (en) * | 2004-06-23 | 2005-03-16 | 华中科技大学 | DC superconducting fault current limiter |
| CN101022217A (en) * | 2007-01-05 | 2007-08-22 | 清华大学 | Fault current limiter DC control system |
| CN102025138A (en) * | 2009-09-15 | 2011-04-20 | 北京云电英纳超导电缆有限公司 | Parallel superconducting fault current limiter |
| CN101710698A (en) * | 2009-12-01 | 2010-05-19 | 河北旭辉电气股份有限公司 | Permanent-magnetic AC reactor current restrictor |
| CN102005750A (en) * | 2010-12-14 | 2011-04-06 | 东南大学 | Composite superconductive fault current-limiting device with self-protection function |
| CN102646968A (en) * | 2012-05-04 | 2012-08-22 | 中国科学院电工研究所 | Reactor type short-circuit fault current limiter |
| CN102790382A (en) * | 2012-07-19 | 2012-11-21 | 中国科学院电工研究所 | Current limited soft connecting/disconnecting device |
| CN102751710A (en) * | 2012-07-30 | 2012-10-24 | 浙江大学 | Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter |
| 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 |
| CN103647264A (en) * | 2013-12-19 | 2014-03-19 | 特变电工沈阳变压器集团有限公司 | Strong coupled type power failure 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 |
| CN107069680A (en) * | 2017-04-26 | 2017-08-18 | 国电南瑞科技股份有限公司 | A kind of four winding magnetic flux restricted type fault current limiters |
| CN206992686U (en) * | 2017-05-15 | 2018-02-09 | 东南大学 | A kind of single-phase saturable core type fault current limiter |
| CN108270221A (en) * | 2018-03-13 | 2018-07-10 | 国网福建石狮市供电有限公司 | A kind of appliance load harmonic treating apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110517869A (en) * | 2019-07-11 | 2019-11-29 | 西安交通大学 | The circuit topology and control method of flexible adjustable transformer neutral point ground connection |
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