CN108400577B - The economical three-phase magnetic saturation fault current limiter of composite excitation formula - Google Patents
The economical three-phase magnetic saturation fault current limiter of composite excitation formula Download PDFInfo
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- CN108400577B CN108400577B CN201810266205.2A CN201810266205A CN108400577B CN 108400577 B CN108400577 B CN 108400577B CN 201810266205 A CN201810266205 A CN 201810266205A CN 108400577 B CN108400577 B CN 108400577B
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- 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
- H02H9/021—Current limitation using saturable reactors
Abstract
The present invention relates to a kind of economical three-phase magnetic saturation fault current limiters of composite excitation formula, including magnetic core, coil windings, three current-limiting inductances and DC excitation power, magnetic core includes two columns of Intermediate Gray air gap and left side A, B, C three-phase side column, three A, B, C three-phase side column of the right positioned at center pillar both sides, coil windings include the first coil being wound on the A column of the left side and the second coil, the tertiary coil and the 4th coil being wound on the B column of the left side, the 5th coil and the 6th coil being wound on the C column of the left side；The 7th coil and the 8th coil being wound on the A column of the right, the 9th coil and the tenth coil being wound on the B column of the left side, the 11st coil and the tenth two coil being wound on the C column of the left side；The present invention integrates three-phase current limiter, has good restriction effect for the short circuit current of various fault types, and has greatly saved magnetic material and installation land occupation.And the loss in iron core is also greatly diminished.
Description
Technical field
The invention belongs to high-voltage electrical equipment technical fields, are related to a kind of setting for limiting AC power transmission network fault current
It is standby, relate in particular to a kind of economical three-phase magnetic saturation fault current limiter of composite excitation formula
Background technique
With the fast continual development of China's economy, electricity demand is continuously increased, and electric system scale is also therewith increasingly
Increase.The continuous increase of electric system electrical network capacity, bring also has system short circuit currents level to be continuously increased therewith, part
Short-circuit current level is even more than the rupturing capacity of breaker, and ascendant trend is more and more obvious, this seriously threatens electric power
The safe and stable operation of system.Currently, the major measure of limitation grid short circuit levels of current has: promoting voltage class, realize electricity
Net layering and zoning management；Current-limiting reactor；Fault current limiter is installed.Promotion voltage class and current-limiting reactor all exist respective
Limitation and defect, therefore cannot be widely used.Short-circuit fault current limiter then overcomes associated limitations, but still exists and promoted
Space.
With the development of fault current limiter, existing following several most commonly seen types: solid-state fault current limiter, superconduction event
Hinder current limiter, magnetic saturation type fault current limiter.Solid-state fault current limiter is more demanding to semiconductor devices used in it, therefore
Semiconductor devices allows for bearing higher overvoltage when barrier occurs, and a large amount of power electronic devices use so that installation cost
Higher and reliability is poor.Superconductive failure current limiter, the application of superconductor, which is then frequently in, to be used to satisfy in magnetic saturation type current limiter
With iron core, but its practical application for greatly limiting superconductor technology to the high request of maintenance technology and high cost.
Magnetic saturation type fault current limiter, an existing main problem are that the magnetic saturation type fault current limiter proposed at present is mostly
Phase structure needs simultaneously to limit fault current using three in the power system, this will cause a large amount of magnetism
The waste of material and huge occupied area, economic performance are poor.
In existing literature 1 (Yuan Jiaxin, " A Novel Three-Phase Compact Saturated-Core Fault
Current Limiter ", IEEE Transaction on magnetics) in disclose a kind of following structure of current limiter,
Such as Fig. 4, including four column iron cores and coil windings, permanent magnet, which is inlayed, is in the core biased iron core；Eight coils
It is respectively wound around on two stems of iron core, it is larger in core sataration and the impedance value of unsaturated state difference；In permanent magnetism
Under body bias effect, iron core is in a saturated state, and coil impedance value is lower, smaller to systematic influence；Make in larger fault current
Under, the iron core in two port type iron cores alternately exits saturation, is wrapped in the impedance value of the coil on two iron cores accordingly
Alternating changes, and the impedance value for making current limiter seal in system increases, and plays metering function.But due to the mutual shadow of three-phase windings
Pilot causes it that can only be used to limit single-phase fault electric current, and poor to the restriction effect of three-phase fault electric current.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind is more reasonable compared with structure described in existing literature 1, in electric power
System when occurring various short troubles can effective limiting short-circuit current, more practical three-phase fault in the power system
Current limiter.
In order to solve the above technical problems, proposing to separate tri-phase iron core at coil, it is connected at horizontal yoke, it can be achieved that right
The limitation of electric system different faults type short circuit current, while land occupation face when reducing the dosage and use of ferromagnetic material
Product.
The technical scheme adopted by the invention is that:
A kind of economical three-phase magnetic saturation fault current limiter of composite excitation formula, it is characterised in that: including iron core, coil around
Group, DC power supply and current-limiting reactor, the iron core include the first opening stem, the second opening stem, are located at described first
Be open the left A phase stem on the stem left side, left B phase stem, left C phase stem and the right A phase stem on the right, right B phase stem, right C phase
The upper and lower ends of stem, the opening stem have upper horizontal yoke, lower horizontal yoke respectively, are inlaid with the first permanent magnet in the upper horizontal yoke,
The second permanent magnet is inlaid in the lower horizontal yoke, the upper horizontal yoke left end connects the left A phase stem, left B phase stem, left C phase
Stem, right end connect the right A phase stem, right B phase stem, right C phase stem, middle part connection the first opening stem, the
Two opening stems；The coil windings include the first coil for being wound on the left A phase stem respectively, the second coil, are wound on
Tertiary coil, the 4th coil of the left B phase stem are wound on the 5th coil, the 6th coil of the left C phase stem, coiling
In the 7th coil, the 8th coil of the right A phase stem, it is wound on the 9th coil, the tenth coil of the right B phase stem, around
The 11st coil, the tenth two coil in the right C phase stem are made, two coils on same side column use ectonexine on side column
Arrangement；First coil and the 7th coil, tertiary coil and the 9th coil, the 5th coil are connected with the 11st coil different name end；The
Two coil and the 8th coil, the 4th coil and the tenth coil, after the 6th coil is connected with the tenth two coil Same Name of Ends, respectively with three
A current-limiting inductance, which is connected in series, accesses DC excitation circuit.
In the economical three-phase magnetic saturation fault current limiter of above-mentioned composite excitation formula, first coil and the 7th coil different name
Series connection access A phase after end is connected, series connection access B phase, the 5th coil and the tenth after tertiary coil is connected with the 9th coil different name end
Series connection access C phase, above-mentioned coil turn are equal after one coil different name end is connected.
In the economical three-phase magnetic saturation fault current limiter of above-mentioned composite excitation formula, the second coil and the 8th coil, the
Four coils and the tenth coil, after the 6th coil is connected with the tenth two coil Same Name of Ends, access of connecting respectively with three current-limiting inductances
DC excitation circuit, above-mentioned coil turn are equal.
It is inlayed in the middle part of the economical three-phase magnetic saturation fault current limiter of above-mentioned composite excitation formula, the upper horizontal yoke
The first permanent magnet is stated, is inlaid with second permanent magnet in the middle part of the lower horizontal yoke；First permanent magnet is encouraged with the second permanent magnet
Magnetic direction is identical, and first permanent magnet is identical as the thickness of the second permanent magnet, the horizontal yoke sectional area phase of sectional area and place
Deng.
In the economical three-phase magnetic saturation fault current limiter of above-mentioned composite excitation formula, coil second, four, six, eight, ten,
The magnetomotive force that ten two coils generate is identical as permanent magnet excitation direction.
In the economical three-phase magnetic saturation fault current limiter of above-mentioned composite excitation formula, the first opening stem, the second opening
Stem, left A phase stem, left B phase stem, left C phase stem, right A phase stem, right B phase stem, right C phase stem, upper horizontal yoke, lower cross
The section of yoke is round, ellipse or rectangle, the left A phase stem, left B phase stem, left C phase stem, right A phase stem, right B phase
Stem, right C phase stem equal length and sectional area are equal, and the coil windings of coiling are upper and lower layer arrangement or inside and outside respectively thereon
Layer arrangement.
In the economical three-phase magnetic saturation fault current limiter of above-mentioned composite excitation formula, the opening stem is located at permanent magnet
Outside, two sides three-phase stem inside.
In the economical three-phase magnetic saturation fault current limiter of above-mentioned composite excitation formula, the length of the upper horizontal yoke and lower horizontal yoke
Spend equal, sectional area is equal, and sectional area is greater than the sectional area of the left A phase stem or right A phase stem.
Workflow of the invention:
The D.C. magnetic field direction and magnetic field of permanent magnet side that six second, four, six, eight, ten, ten two coils of DC coil generate
To consistent, iron core is made to be in presaturation.When route operates normally, in the half period of the positive direction of route three-phase current,
Alternating current magnetic field direction caused by first coil, tertiary coil and the 5th coil on left stem A, B, C tri-phase iron core and biasing
Magnetic direction is consistent, and under the bias in the magnetic field being overlapped mutually, left side three-phase stem iron core enters depth saturation state；It is right
Alternating current magnetic field direction and permanent magnetism caused by the 7th coil, the 9th coil and the 11st coil on stem A, B, C tri-phase iron core
Body bias magnetic direction on the contrary, but route operate normally when, coil generate alternating current magnetic field be less than permanent magnet bias magnetic field,
Under the bias in the magnetic field cancelled out each other, right stem iron core is still within saturation state；In the negative half period of line current, process
It is contrary to the above, but the left and right stem iron core in two sides is all in saturation state；Therefore, when route operates normally, in DC loop
Inductance will not access ac circuit, Low ESR is externally presented in current limiter, will not influence system operation.
When short trouble occurs for transmission line of electricity, faulted phase current is increased rapidly, and short circuit current is greater than peak load electricity
Stream.Therefore, the alternating current magnetic field that two coil of failure phase generates will be greater than permanent magnet bias magnetic field；In short circuit current positive half cycle, Zuo Xin
Alternating current magnetic field on column failure phase iron core increases, and direction is consistent with permanent magnet bias magnetic field direction, left stem failure phase iron core
Degree of saturation deepen, left side failure phase AC coil impedance value is still smaller；AC coil on right stem failure phase iron core
Generated alternating current magnetic field also increases, since the alternating current magnetic field that coil generates is greater than permanent magnet bias magnetic field, and it is contrary, it is right
Stem failure phase stem iron core then exits saturation state, and the DC coil and AC coil on the iron core form transformer, will be straight
Flow back to the current-limiting inductance access ac circuit on road；In short circuit current negative half period, left stem failure phase iron core then exits saturation state,
Failure iron core AC coil and DC coil form transformer, and right stem iron core enters saturation state once more；Therefore in failure
When generation, left stem failure iron core and right stem failure iron core alternately exit saturation state, form transformer.Fault current limiter
The relatively outer impedance value presented of failure significantly increases, and rapidly improves the impedance value of transmission line of electricity, to limit the short circuit of route
Electric current ensures line security.
Beneficial effects of the present invention: 1. integrate single-phase fault current limiter progress three-phase, while guaranteeing current limitation effect
The dosage of ferromagnetic material is greatly saved, occupied area required for installing also is substantially reduced.2. being wound in each iron core column
Transformer action of the AC and DC coil in failure enables the current-limiting inductance in DC loop automatically to put into and cut
The presence of ac circuit out, current-limiting inductance improves fault current limiter current limitation effect.3. the structure of three-phase symmetrical makes under normal condition
It is offset each other by the exchange flux of horizontal yoke and permanent magnet, greatly reduces horizontal yoke and the intracorporal core loss of permanent magnetism.4. using
Hybrid excitation reduces excitation loss, while solving to be difficult to keep iron core depth full in high-voltage large-capacity field permanent magnet
And the problem of.5. comparing current limiter described in existing literature 1, the present invention is under the premise of saving a large amount of ferromagnetic materials, Neng Gouyou
Fault current caused by all kinds of fault types in the limitation electric system of effect, especially the most serious three-phase fault electric current,
It is more in line with actual demand of the electric system for fault current limitation technology.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Fig. 2 is the coil connection schematic diagram of the embodiment of the present invention.
Fig. 3 is iron core of embodiment of the present invention schematic diagram.
Fig. 4 is the structural schematic diagram of the prior art.
Specific embodiment
By following detailed description combination attached drawing it will be further appreciated that the features and advantages of the invention.Provided implementation
Example is only the explanation to the method for the present invention, remaining content without limiting the invention in any way announcement.
As shown in Figure 1, a kind of economical three-phase magnetic saturation fault current limiter of composite excitation formula, hereinafter referred to as current limiter,
Including iron core, coil windings, three current-limiting inductances and DC excitation power, iron core is opened by centre the first opening stem 101, second
Mouthful stem 102 and the left A phase stem 201 positioned at center pillar both sides, left B phase stem 202, left C phase stem 203, right A phase stem 204,
Right B phase stem 205, right C phase stem 206, upper horizontal yoke 301, lower horizontal yoke 302, the first permanent magnet being embedded in the middle part of horizontal yoke
401, the second permanent magnet 402 composition in the middle part of lower horizontal yoke；First coil 1 and the second coil 2 are wound on left A phase stem 201, it is left
It is wound with tertiary coil 3 and the 4th coil 4 on B phase stem 202, is wound with the 5th coil 5 and the 6th line on left C phase stem 203
Circle 6 is wound with the 7th coil 7 and the 8th coil 8 on right A phase stem 204, be wound on right B phase stem 205 the 9th coil 9 and
Tenth coil 10 is wound with the 11st coil 11 and the tenth two coil 12 on right C phase stem 206；Two coils on same stem
Inside and outside layer arrangement is used on stem.First coil 1 and the 7th coil 7, tertiary coil 3 and the 9th coil 9, the 5th coil 5 with
11st coil, 11 different name end is connected；Second coil 2 and the 8th coil 8, the 4th coil 4 and the tenth coil 10, the 6th coil 6 with
After tenth two coil, 12 Same Name of Ends is connected, access DC excitation circuit of connecting respectively with three current-limiting inductances.
For the present embodiment by the way of Nd-Fe-B permanent magnet material and DC excitation composite excitation, neodymium iron boron is that a kind of performance is excellent
Rare earth permanent-magnetic material more, advantage have: (1) magnetic property is high；Coercivity is equivalent to 5~10 times of ferrite permanent-magnet materials, aluminium
5~15 times of nickel cobalt permanent-magnet material；(2) resourceful, price is lower；Main material is that iron accounts for 2/3, and rare earth material neodymium accounts for 1/3,
Resource relative abundance；(3) mechanical mechanics property is good, can carry out machining and drilling；Using composite excitation primarily to drop
It is low that the loss of current limiter is reduced to the magnetomotive requirement of direct current, while solving permanent magnet independent role and being difficult to make high-voltage large-capacity
The problem of core sataration.
The left and right stem section of the present embodiment iron core can be round, ellipse or rectangle.As shown in figure 3, in embodiment
The section for selecting the left and right stem of iron core is rectangle, the sectional area S1 and the right three-phase core of left side three-phase stem 201,202,203
The sectional area S3 of the sectional area S2 of column 204,205,206 and the stem 101,102 that is open is equal, two sides stem equal length；On
The sectional area S5 of the sectional area S4 of horizontal yoke 301 and lower horizontal yoke 302 is equal, upper and lower horizontal yoke equal length；Upper horizontal yoke 301 and lower horizontal yoke
302 sectional area S4, S5 should be greater than sectional area S1, S2 of left stem 101 and right stem 102, to guarantee in left and right stem iron core
When in a saturated state, the iron core of horizontal yoke is still within undersaturated condition；The section of first permanent magnet 401, the second permanent magnet 402
Product is equal to the sectional area of the horizontal yoke where it, and the thickness of the two permanent magnets is identical, and dimensional structure size is completely the same, this is
In order to ensure the symmetry of magnetic structure, core structure center line is at axial symmetry.The sectional area of the permanent magnet, that is, horizontal yoke
The ratio of the ratio between sectional area S1 or S2 of sectional area S4 or S5 and stem and permanent magnet residual magnetism size and core sataration magnetic induction intensity
It is worth related.
As shown in Fig. 2, the working principle of the present embodiment fault current limiter is the current-limiting reactor that magnetic switch will be used to control
It connects with transmission line of electricity, realizes the limitation to short-circuit current.
The present embodiment course of work are as follows: left in the half period of the positive direction of line current when route operates normally
Coil 1 on A phase stem 201, the coil 3 on left B phase stem 202, AC magnetism caused by the coil 5 on left C phase stem 203
Field direction is consistent with bias magnetic field direction, under the bias in the magnetic field being overlapped mutually, left A phase stem 201, left B phase stem
202, the iron core of left C phase stem 203 enters depth saturation state；On coil seven, right B phase stem 205 on right A phase stem 204
Coil nine, alternating current magnetic field direction and bias magnetic field caused by the coil 11 on right C phase stem 206 it is contrary, but
When route operates normally, the alternating current magnetic field that coil windings generate is less than permanent magnet bias magnetic field, in the inclined of the magnetic field cancelled out each other
Set under effect, right A phase stem 204, right B phase stem 205, right C phase stem 206 iron core be still within saturation state；In route
The negative half period of electric current, process is contrary to the above, but the iron core of two sides stem is all in saturation state；At this point, stem 201,202,
AC coil and DC coil on 203,204,205,206 is without coupling, and the current-limiting inductance of DC side is without effect.Therefore,
When route operates normally, the impedance value that current limiter is presented in transmission line of electricity is smaller, and voltage loss and energy can be effectively reduced
Loss.
When short trouble occurs for transmission line of electricity, electric current is increased rapidly, and short circuit current is greater than maximum load current.Cause
This, the alternating current magnetic field generated there are the phase iron core coil winding of failure will be greater than permanent magnet bias magnetic field；Short circuit current just
Half cycle, alternating current magnetic field caused by AC coil increases in the failure phase of the left side, and direction is consistent with permanent magnet bias magnetic field direction,
The degree of saturation of left stem failure phase iron core is deepened, and coupling will not occur for direct current and AC coil；Right stem failure phase iron
Alternating current magnetic field caused by core coil also increases, since the alternating current magnetic field that coil windings generate is greater than permanent magnet bias magnetic field,
And it is contrary, the iron core of right stem failure phase then exits saturation state, AC coil and DC coil on failure phase iron core
There are coupling, current-limiting reactor accesses ac circuit.It is similar with the above process in short circuit current negative half period.Therefore in failure
When generation, the iron core of the iron core of left stem failure phase and right stem failure phase alternately exits saturation state, exits the iron core of saturation
There are couplings to form transformer for upper DC coil and AC coil, and current-limiting inductance in DC loop is accessed ac circuit.
The impedance value that the failure phase of fault current limiter is whole significantly increases, and rapidly improves the impedance value of transmission line of electricity, to restraining line
The short circuit current on road ensures line security.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Claims (8)
1. a kind of economical three-phase magnetic saturation fault current limiter of composite excitation formula, it is characterised in that: including iron core, coil around
Group, DC power supply and current-limiting reactor, the iron core include the first opening stem, the second opening stem, are located at described first
Be open the left A phase stem on the stem left side, left B phase stem, left C phase stem and the right A phase stem on the right, right B phase stem, right C phase
The upper and lower ends of stem, the opening stem have upper horizontal yoke, lower horizontal yoke respectively, are inlaid with the first permanent magnet in the upper horizontal yoke,
The second permanent magnet is inlaid in the lower horizontal yoke, the upper horizontal yoke left end connects the left A phase stem, left B phase stem, left C phase
Stem, right end connect the right A phase stem, right B phase stem, right C phase stem, middle part connection the first opening stem, the
Two opening stems；The coil windings include the first coil for being wound on the left A phase stem respectively, the second coil, are wound on
Tertiary coil, the 4th coil of the left B phase stem are wound on the 5th coil, the 6th coil of the left C phase stem, coiling
In the 7th coil, the 8th coil of the right A phase stem, it is wound on the 9th coil, the tenth coil of the right B phase stem, around
The 11st coil, the tenth two coil in the right C phase stem are made, two coils on same side column use ectonexine on side column
Arrangement；First coil and the 7th coil, tertiary coil and the 9th coil, the 5th coil are connected with the 11st coil different name end；The
Two coil and the 8th coil, the 4th coil and the tenth coil, after the 6th coil is connected with the tenth two coil Same Name of Ends, respectively with three
A current-limiting inductance, which is connected in series, accesses DC excitation circuit.
2. the economical three-phase magnetic saturation fault current limiter of composite excitation formula according to claim 1, it is characterised in that: the
Series connection access A phase, series connection after tertiary coil is connected with the 9th coil different name end after one coil is connected with the 7th coil different name end
Enter B phase, series connection access C phase, above-mentioned coil turn are equal after the 5th coil is connected with the 11st coil different name end.
3. the economical three-phase magnetic saturation fault current limiter of composite excitation formula according to claim 1, it is characterised in that: the
Two coil and the 8th coil, the 4th coil and the tenth coil, after the 6th coil is connected with the tenth two coil Same Name of Ends, respectively with three
A current-limiting inductance series connection access DC excitation circuit, above-mentioned coil turn are equal.
4. the economical three-phase magnetic saturation fault current limiter of composite excitation formula according to claim 1 or 3, feature exist
In: it is inlaid with first permanent magnet in the middle part of the upper horizontal yoke, is inlaid with second permanent magnet in the middle part of the lower horizontal yoke；It is described
First permanent magnet is identical as the second permanent magnet excitation direction, and first permanent magnet is identical as the thickness of the second permanent magnet, section
Area is equal with the horizontal yoke sectional area at place.
5. the economical three-phase magnetic saturation fault current limiter of composite excitation formula according to claim 4, it is characterised in that: line
It is identical as permanent magnet excitation direction to enclose the magnetomotive force that second, four, six, eight, ten, ten two coils generate.
6. the economical three-phase magnetic saturation fault current limiter of composite excitation formula according to claim 1, it is characterised in that: the
One opening stem, the second opening stem, left A phase stem, left B phase stem, left C phase stem, right A phase stem, right B phase stem, right C
Phase stem, upper horizontal yoke, lower horizontal yoke section be round, ellipse or rectangle, the left A phase stem, left B phase stem, left C phase core
Column, right A phase stem, right B phase stem, right C phase stem equal length and sectional area are equal, and the coil windings of coiling are respectively thereon
Upper and lower layer arrangement or inside and outside layer arrangement.
7. the economical three-phase magnetic saturation fault current limiter of composite excitation formula according to claim 1, it is characterised in that: institute
It states opening stem to be located on the outside of permanent magnet, on the inside of the three-phase stem of two sides.
8. the economical three-phase magnetic saturation fault current limiter of composite excitation formula according to claim 1, it is characterised in that: institute
The equal length of horizontal yoke and lower horizontal yoke is stated, sectional area is equal, and sectional area is greater than the left A phase stem or right A phase stem
Sectional area.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529694A (en) * | 2016-02-01 | 2016-04-27 | 上海理工大学 | Saturated core-type fault current limiter capable of relieving DC impact |
| CN107689631A (en) * | 2017-07-20 | 2018-02-13 | 兰州交通大学 | A kind of new magnetic integration apparatus of transformer type controlled reactor |
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| EP2474010B1 (en) * | 2009-08-31 | 2018-06-06 | Bar Ilan Research&Development Company Ltd. | Improved fault current limiter with saturated core |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529694A (en) * | 2016-02-01 | 2016-04-27 | 上海理工大学 | Saturated core-type fault current limiter capable of relieving DC impact |
| CN107689631A (en) * | 2017-07-20 | 2018-02-13 | 兰州交通大学 | A kind of new magnetic integration apparatus of transformer type controlled reactor |
Non-Patent Citations (1)
| Title |
|---|
| 饱和铁心型桥式故障限流器的性能参数设计与实验;陈柏超 等;《电工技术学报》;20170731;第32卷(第13期);第185-193页 * |
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