CN208623324U - Single-phase magneto-restrictive fault current limiter - Google Patents
Single-phase magneto-restrictive fault current limiter Download PDFInfo
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- CN208623324U CN208623324U CN201821197954.6U CN201821197954U CN208623324U CN 208623324 U CN208623324 U CN 208623324U CN 201821197954 U CN201821197954 U CN 201821197954U CN 208623324 U CN208623324 U CN 208623324U
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Abstract
The utility model 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 is cancelled 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 utility model, 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 limitation of fault current levels.
Description
Technical field
The utility model relates to a kind of single-phase magneto-restrictive fault current limiters, belong to electrical technology field.
Background technique
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
It slightly, is one of the important electrical circuitry equipment of current electric grid development.
The working mechanism of fault current limiter are as follows: Low ESR is presented when system is normal, reduces and power grid is operated normally
Influence minimum；When ground fault etc. occurs extremely, high impedance is presented, to constitute 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, route damage is reduced
Consumption improves system power-angle stability；3, thermostabilization limit when avoiding 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, 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 is saturated iron core when normal, when failure using cut-off coil limit therefore
Hinder electric current, advantage is that loss is low, the disadvantage is that at 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 capacitor
Cascaded structure, shunt capacitance carries out current limliting, it can be achieved that from triggering when failure, but volume is big, cost is high.
Utility model content
The utility model provides a kind of single-phase magneto-restrictive fault current limiter, and using bypass when failure, (closure is other
Way switch) vice-side winding carries out the mechanism of fault current limitation, and it solves existing single phase magnetic circuit control type fault current limiter and utilizes
The disadvantages of cut-offfing big difficulty, poor reliability existing for this mode of coil fault current limiting is cut-off, while solving existing event
The problems such as volume and cost being primarily present in barrier demand limiter are high, current limliting speed is slow, loss is big.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the utility model is
Single-phase magneto-restrictive fault current limiter, including iron core are full of the winding of two-way concatenation, two-way winding on iron core
The magnetic flux generated in the 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 are simultaneously connect.
Two windings respectively and connect there are two arrester.
The utility model is achieved the utility model has the advantages that the utility model is in nominal situation, and by-pass switch is cut-off, two-way around
The magnetic flux that group generates in the core is cancelled out each other to zero, and single-phase magneto-restrictive fault current limiter is to transimission power and line electricity
Stream is without influence；When short trouble occurs, by quick-make by-pass switch, revert to the magnetic flux cancelled out each other in iron core specified
Magnetic flux solves existing single phase magnetic circuit control type failure limit to generate rated impedance and realize the limitation of fault current levels
Stream device using cut-off coil fault current limiting in the way of this existing for cut-off difficulty greatly, poor reliability the disadvantages of, solve simultaneously
The problems such as volume and cost being primarily present in existing fault current limiter are high, current limliting speed is slow, loss is big.
Detailed description of the invention
Fig. 1 is the structure principle chart of the utility model；
Fig. 2 is the simulation model figure of the utility model；
Short circuit current analogous diagram when Fig. 3 is power grid short trouble when not having fault current limiter access；
Fig. 4 is that short circuit current analogous diagram when short trouble occurs for power grid when the utility model accesses.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating this
The technical solution of utility model, and cannot be used as a limitation the limitation protection scope of the utility model.
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 is (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 (be wound in Fig. 1 on two stems in left and right) rotating around on two opposite stems, 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
Route, along current direction, defining first, electric current and flowing through is primary side winding, 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, which 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 can generate 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, also mountable 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 are as follows: power grid 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, connect
Short circuit current level is 0.611kA when entering FCL, and introducing FCL fault current is be not introduced into FCL fault current 43.36%, current limliting
Effect is obvious, as shown in Figure 3 and Figure 4 respectively.
In conclusion above-mentioned fault current limiter, carries out fault current using (closure) vice-side winding is bypassed when failure
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 disadvantages 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 the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change
It also should be regarded as the protection scope of the utility model into deformation.
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
For 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: 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 |
|---|---|---|---|
| CN201821197954.6U CN208623324U (en) | 2018-07-27 | 2018-07-27 | Single-phase magneto-restrictive fault current limiter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821197954.6U CN208623324U (en) | 2018-07-27 | 2018-07-27 | Single-phase magneto-restrictive fault current limiter |
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| Publication Number | Publication Date |
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| CN208623324U true CN208623324U (en) | 2019-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2018
- 2018-07-27 CN CN201821197954.6U patent/CN208623324U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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