CN101710698A - Permanent-magnetic AC reactor current restrictor - Google Patents
Permanent-magnetic AC reactor current restrictor Download PDFInfo
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- CN101710698A CN101710698A CN200910175293A CN200910175293A CN101710698A CN 101710698 A CN101710698 A CN 101710698A CN 200910175293 A CN200910175293 A CN 200910175293A CN 200910175293 A CN200910175293 A CN 200910175293A CN 101710698 A CN101710698 A CN 101710698A
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Abstract
The invention discloses a permanent-magnetic AC reactor current restrictor, which comprises a reactance bridge circuit and a permanent magnet, wherein the reactance bridge circuit mainly comprises an iron core, an upper iron yoke, a lower iron yoke and an AC winding; the iron core comprises a central pillar and a side pillar; the side pillar is sleeved with the AC winding; the AC winding is formed by serially connecting the same-named ends of AC coils in a reverse direction; the permanent magnet is arranged in the central pillar; the side pillar and the central pillar of the iron core, the upper iron yoke, the lower iron yoke and the middle-arranged permanent magnet form an AC magnetic field loop and a bias magnetic field loop. The current restrictor has the advantages of simple structure and reliable operation. When the current restrictor is applied to AC systems, the current restrictor can effectively reduce reactive power loss and voltage drop during normal operation, and can quickly respond to short circuit faults and effectively suppress short circuit current.
Description
Technical field
The present invention relates to the short-circuit fault current limiter used in a kind of AC electric power systems.
Background technology
Along with the increase day by day of net capacity in the electric power system, the short circuit current of system is also strengthening greatly, and the short circuit current that short trouble forms has become one of distinct issues of harm safe operation of power system.The electric power system limiting short-circuit current generally adopts series reactor at present, and perhaps serial connection high-capacity and high-speed switch and reactor shunting means in system perhaps adopt novel short-circuit fault current limiter.The application of this dual mode that all there have been serious drawbacks limit in traditional reactor and high-speed switching arrangement.Existing novel short-circuit fault current limiter has overcome the shortcoming of preceding two kinds of current-limiting apparatus, but still comes with some shortcomings.1, superconduct failure current limit (SFCL) is divided into resistor-type and inductance superconduct.Resistor-type at electric current just often, superconductor is in superconducting state does not have resistance.If the electric current increase has surpassed critical current, then superconductor withdraws from superconducting state, have high value resistor and connect with electrical network, thus limiting short-circuit current.Inductive type at electric current just often, the electric current degaussing of superconductor ring or make iron core be in the magnetic saturation state makes the operational mode of this FCL be Low ESR (being close to leakage reactance).When electric current increased above critical current, this superconductor ring entered high impedance status, thereby plays the effect of limiting short-circuit current.Superconductive current limiter exists Superconductor Physics material and mechanical performance to be limited to, manufacturing cost height, problems such as operating cost height.2, PTC thermistor short circuit current limiter is to utilize PTC thermistor nonlinear resistance when normal current, and resistance temperature hangs down and has the little characteristic of impedance, and temperature rises after short circuit current surpasses critical value, thereby the resistance value increase reaches the current limliting purpose.But exist recovery time long, shortcomings such as poor stability.3, solid-state switch type fault current limiter mainly contains magnetic saturation type short circuit current limiter, direct current reactor type short circuit current limiter.The solid-state version fault current limiter has the advantage that action is fast, recovery time is short.But shortcomings such as there is complex structure in existing direct current reactor type short circuit current limiter, control is unreasonable, harmonic content big, poor reliability.Magnetic saturation type short circuit current limiter generally needs the D.C. magnetic biasing power supply, exists the cost height equally, problems such as poor reliability.
The electric power system limiting short-circuit current also often adopts dry type hollow current-limiting reactor at present, and this kind reactor volume is bigger, and surrounding environment is had powerful electromagnetic pollution, disturbs very big to communication and computer system.Be head it off, Chinese patent 03253037.4 has proposed a kind of iron core current limiting reactor, iron core mainly is made up of two or three stems and last lower yoke, be with winding on the stem, the upper and lower side of each stem is connected to form magnetism guiding access with last lower yoke respectively, there are two on the stem around connecting to form,, obtain required inductance value to offset most of magnetic flux to opposite coil.Although this patent has successfully solved the electromagnetic pollution of reactor, but during the reactor operate as normal, iron core is in undersaturated condition, increased the loss of power virtually, make the power consumption of system increase, and state changes slower, can not respond the generation of short trouble fast, further the increase of limiting short-circuit current.
Summary of the invention
The magneto reactor type flow restricter that responds fast when reducing reactive loss, short trouble when the invention provides a kind of can normally the operation in system.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of permanent-magnetic AC reactor current restrictor, comprise mainly by the iron core that comprises newel and side column, go up lower yoke and be sleeved on the reactance bridge circuit that the AC Windings on the side column constitutes, the reactance bridge circuit mainly is made of iron core, last lower yoke and AC Windings, described iron core comprises newel and side column, be set with AC Windings on the side column, AC Windings is made of two groups of AC coil, be provided with permanent magnet in the described newel, two groups of AC coil end differential concatenations of the same name constitute permanent-magnetic AC reactor current restrictor.Be applied in the single-phase loop of AC system.
During the present invention is applied to, low-pressure system: described permanent-magnetic AC reactor current restrictor is serially connected with respectively between each phase power supply of three-phase system and the load, constitutes three-phase permanent formula AC reactor current restrictor.Single-phase permanent formula AC reactor current restrictor is applied in the three-phase system, is serially connected with respectively between each phase power supply of system and the load by three single-phase permanent formula AC reactor current restrictors.
The present invention is applied to high pressure or extra high voltage system: described permanent-magnetic AC reactor current restrictor is connected in parallel on the secondary of coupling transformer, is serially connected with between power supply and the load, constitutes the permanent-magnetic AC reactor current restrictor of band coupling transformer; Permanent-magnetic AC reactor current restrictor is applied to be connected in parallel on the secondary of single-phase coupling transformer in high pressure or the supergrid system, is serially connected with between single phase poaer supply and the load.The permanent-magnetic AC reactor current restrictor of three band coupling transformers is serially connected with respectively between each phase power supply of three-phase system and the load, constitute the permanent-magnetic AC reactor current restrictor of three facies tract coupling transformers, constitute the permanent-magnetic AC reactor current restrictor of three facies tract coupling transformers.
A kind of permanent-magnetic AC reactor current restrictor, comprise the reactance bridge circuit that mainly constitutes by iron core, last lower yoke and AC Windings, iron core comprises newel and side column, be set with AC Windings on the side column, described newel is provided with permanent magnet, described side column is symmetrical arranged for two or more, and the end differential concatenation of the same name in twos of the AC coil on the symmetrically arranged side column constitutes three-phase permanent formula AC reactor current restrictor.
Above-mentioned three-phase permanent formula AC reactor current restrictor is applied to high pressure or extra high voltage system: described three-phase permanent formula AC reactor current restrictor is connected to the secondary of three coupling transformers, constitutes the permanent-magnetic AC reactor current restrictor of three facies tract coupling transformers.
The control mode of current limliting winding of the present invention is: described current limliting winding is opposite at the flow direction of side column generation relatively.
The improvement of side column of the present invention is: the sectional area of described each side column equates that the sectional area of newel is more than or equal to the summation of side column sectional area.
The improvement of described permanent magnet is: described permanent magnet is more than one or one.
Operation principle of the present invention is as follows:
The present invention by newel, side column, go up lower yoke and the AC Windings that is sleeved on the side column constitutes the AC magnetic field loop, constitute the bias magnetic field loop by newel, side column, the permanent magnet gone up on lower yoke and the newel.The magnetic field intensity that bias field intensity that permanent magnet produces produces greater than maximum load current Ie is set, and after the two was cancelled out each other, bias field still can make the side column iron core be in saturation condition.
When system normally moves, load current I
LBe not more than maximum load current Ie.Between the load current positive half period, the sense of current flows to the N end by AC Windings L end, and the right post coil magnetic field direction is identical with permanent magnet bias field direction, after the mutual superposition, makes the right column iron core degree of saturation aggravate; And left side post coil magnetic field direction is opposite with the permanent magnet magnetic field direction, and after cancelling out each other, left side column iron core still is in saturation condition, so the whole induction reactance of AC Windings is less.In like manner, between the load current negative half-cycle, the sense of current flows to the L end by AC Windings N end, and left side post coil magnetic field direction is identical with permanent magnet bias field direction, mutual superposition, the aggravation of left side column iron core saturation; The right post coil magnetic field is opposite with permanent magnet bias field direction, and after cancelling out each other, the right column iron core degree of saturation reduces, but still is in saturation condition, so the whole induction reactance of AC Windings is less.The whole induction reactance of AC Windings was less when the present invention normally moved in system, to reduce voltage loss and reactive loss.
After system is short-circuited fault, short circuit current I
dGreater than maximum load current Ie.The sense of current flows to the N end by AC Windings L end between the short circuit current positive half period, and the right post coil magnetic field is identical with permanent magnet bias field direction, after the mutual superposition, and the aggravation of the right column iron core degree of saturation; And left side post coil magnetic field is opposite with permanent magnet bias field direction, and after cancelling out each other, left side column iron core withdraws from saturation condition, thereby the whole reactance of AC Windings is increased, and plays the purpose of limiting short-circuit current.In like manner, between the short circuit current negative half-cycle, the sense of current flows to the L end by AC Windings N end, and left side post coil magnetic field is identical with permanent magnet bias field direction, after the mutual superposition, and the aggravation of left side column iron core saturation; The right post coil magnetic field is opposite with permanent magnet bias field direction, and after cancelling out each other, the right column iron core withdraws from saturation condition, and the right post coil induction reactance increases, thereby makes the whole induction reactance of AC Windings increase.The whole induction reactance of the present invention's AC Windings when being short-circuited fault increases rapidly, and moment changes the impedance parameter of circuit, reaches the purpose of limiting short-circuit current.
Owing to adopted above technical scheme, the invention technological progress is:
The present invention proposes a kind of new Current limited Control mode, it is simple in structure, and is reliable.The permeability of flow restricter iron core and the size of short circuit current are closely related, and therefore when being short-circuited fault, can changing impedance parameter and end increasing of short circuit current with restriction before first peak value of short circuit current.Electric current in the control winding of AC Windings reactance parameter is controlled automatically, and the setting of permanent magnet can be so that iron core when the normal duty electric current, always be in saturation condition, and winding induction reactance parameter is less; Electric current is opposite at the flow direction of side column generation relatively in the AC Windings, in total the existence under the demagnetizing action of a winding at permanent magnet of any time of short circuit current, keeps bigger induction reactance parameter.Being provided with of permanent magnet can replace D.C. magnetic biasing power supply and magnetic bias winding, makes the structure of flow restricter obtain simplifying, and cost reduces, and reliability strengthens.The present invention can be applied in different electric power places.The sectional area of each side column equates that being set to polylith with permanent magnet helps realizing in the production, is convenient to make.
Description of drawings
Fig. 1: structural representation of the present invention and load current produce the magnetic field schematic diagram.
Wherein: 1. newel, 2. left side post, 3. the right post, 4. permanent magnet, 5. left coil, 6. right coil is 7. gone up lower yoke.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in more detail.
Fig. 1 is a permanent-magnetic AC reactor current restrictor, comprise the reactance bridge circuit, the reactance bridge circuit mainly is made up of AC Windings, iron core and last lower yoke 7, iron core comprises newel 1 and left and right sides side column 2,3, be provided with permanent magnet 4 in the newel, be set with AC Windings on the side column, AC Windings is made of two groups of AC coil, 5,6 end differential concatenations of the same name, and coil is set on the left and right side column 2,3.The sectional area of side column 2,3 equates that the sectional area of newel 1 is the summation of left and right sides side column 2,3 sectional areas.
AC Windings, side column, intermediolateral column, last lower yoke and mid-permanent magnet constitute AC magnetic field loop and bias magnetic field loop.Magnetic direction is as shown in fig. 1: K1 is a left side post coil magnetic field direction, and K2 is the right post coil magnetic field direction, and K is a permanent magnet bias field direction.
When system normally moved, between the positive half period of load current, the sense of current was for flowing to the N end by the L end, and the right post coil magnetic field direction is identical with permanent magnet bias field direction, after the mutual superposition, made the right column iron core saturation aggravation.Left side post coil magnetic field direction is opposite with permanent magnet bias field direction, after cancelling out each other, make left side column iron core desaturation, but left side column iron core still is in saturation condition; In like manner, after load current was reverse, the course of work and said process were reverse.Therefore, the whole induction reactance of AC Windings is less when normally moving in system, to reduce voltage loss and reactive loss.
When system was short-circuited fault, short circuit current Id after short circuit current magnetic field and the stack of permanent magnet 4 bias magnetic fields, made that the column iron core degree of saturation is aggravated greater than maximum load current Ie on one side.Short circuit current magnetic field and permanent magnet 4 bias magnetic fields make the another side column iron core withdraw from saturation condition after offsetting, and the winding induction reactance on this side column increases.Therefore, the whole induction reactance of AC Windings increases during system short-circuit fault, can limit transient short circuit current, also can limit steady short.
The present invention is applied in the single-phase earthing fault loop, constitutes single-phase permanent formula AC reactor current restrictor, also can be that three single-phase permanent-magnetic AC reactor current restrictors insert formation three-phase permanent formula AC reactor current restrictor in the three-phase system respectively; Single-phase permanent formula AC reactor current restrictor can also be parallel to the secondary of coupling transformer, constitute the permanent-magnetic AC reactor current restrictor of single-phase zone coupling transformer; Also the secondary that three permanent-magnetic AC reactor current restrictors are received three single-phase coupling transformers respectively can be constituted the permanent-magnetic AC reactor current restrictor of three facies tract coupling transformers.
Concrete structure of the present invention is not limited to the foregoing description, it can also be the permanent-magnetic AC reactor current restrictor of three-phase integrated formula, the permanent magnet that is provided with on its newel can be for one or more, symmetrically arranged side column can be for more than two, be set with corresponding AC coil on the side column, the end differential concatenation of the same name in twos of the AC coil on the symmetrically arranged side column; The sectional area of newel is equal to, or greater than the summation of all side column sectional areas.Be applied to, in the low-pressure system.In the time of in being applied to high pressure or ultrahigh-vacuum system, be the secondary that this device is inserted the coupling transformer of three-phase system, can reach the purpose of restriction short-circuit current equally.
Claims (8)
1. permanent-magnetic AC reactor current restrictor, comprise mainly by the iron core that comprises newel and side column, go up lower yoke and be sleeved on the reactance bridge circuit that the AC Windings on the side column constitutes, it is characterized in that: be provided with permanent magnet in the described newel, two groups of AC coil end differential concatenations of the same name.
2. permanent-magnetic AC reactor current restrictor according to claim 1 is characterized in that: described permanent-magnetic AC reactor current restrictor is serially connected with respectively between each phase power supply of three-phase system and the load, constitutes three-phase permanent formula AC reactor current restrictor.
3. permanent-magnetic AC reactor current restrictor according to claim 1, it is characterized in that: described permanent-magnetic AC reactor current restrictor is connected in parallel on the secondary of coupling transformer, be serially connected with between power supply and the load, constitute the permanent-magnetic AC reactor current restrictor of band coupling transformer; The permanent-magnetic AC reactor current restrictor of three band coupling transformers is serially connected with respectively between each phase power supply of three-phase system and the load, constitutes the permanent-magnetic AC reactor current restrictor of three facies tract coupling transformers.
4. permanent-magnetic AC reactor current restrictor, comprise the reactance bridge circuit that mainly constitutes by iron core, last lower yoke and AC Windings, iron core comprises newel and side column, be set with AC Windings on the side column, it is characterized in that: described newel is provided with permanent magnet, described side column is symmetrical arranged for two or more, and the end differential concatenation of the same name in twos of the AC coil on the symmetrically arranged side column constitutes three-phase permanent formula AC reactor current restrictor.
5. permanent-magnetic AC reactor current restrictor according to claim 4, it is characterized in that: described three-phase permanent formula AC reactor current restrictor is connected to the secondary of three coupling transformers, constitutes the permanent-magnetic AC reactor current restrictor of three facies tract coupling transformers.
6. according to each described permanent-magnetic AC reactor current restrictor of claim 1 to 5, it is characterized in that: described AC Windings is opposite at the flow direction of side column generation relatively.
7. according to each described permanent-magnetic AC reactor current restrictor of claim 1 to 5, it is characterized in that the sectional area of described each side column equates that the sectional area of newel is more than or equal to the summation of side column sectional area.
8. according to each described permanent-magnetic AC reactor current restrictor of claim 1 to 5, it is characterized in that: described permanent magnet is more than one or one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910175293A CN101710698A (en) | 2009-12-01 | 2009-12-01 | Permanent-magnetic AC reactor current restrictor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910175293A CN101710698A (en) | 2009-12-01 | 2009-12-01 | Permanent-magnetic AC reactor current restrictor |
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| CN200910175293A Pending CN101710698A (en) | 2009-12-01 | 2009-12-01 | Permanent-magnetic AC reactor current restrictor |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087901A (en) * | 2010-12-17 | 2011-06-08 | 北京云电英纳超导电缆有限公司 | Compact iron core structure comprising magnetic bridges |
| CN102315006A (en) * | 2011-05-10 | 2012-01-11 | 戴珊珊 | Permanent magnetic gain voltage transformation device |
| CN103928214A (en) * | 2014-03-26 | 2014-07-16 | 中国科学院电工研究所 | Double-column double-split reactor applied to current limiter |
| CN105575634A (en) * | 2016-03-16 | 2016-05-11 | 江苏万邦节能科技股份有限公司 | Adjustable electric reactor used for controlling electric energy quality |
| CN107068354A (en) * | 2016-12-30 | 2017-08-18 | 上海意兰可电力电子设备有限公司 | Three-phase common mode reactor |
| 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 |
| CN109378812A (en) * | 2018-12-10 | 2019-02-22 | 武汉大学 | A kind of the magnetic saturation iron core DC Line Fault current limiter and current-limiting method of high inductance no-load voltage ratio |
| CN113257544A (en) * | 2021-05-18 | 2021-08-13 | 赵鑫堂 | Core type permanent magnetic transformer |
| CN114512971A (en) * | 2022-01-13 | 2022-05-17 | 武汉大学 | Hybrid excitation multifunctional saturated iron core alternating current fault current limiter and current limiting method |
| WO2024139941A3 (en) * | 2022-12-26 | 2024-08-15 | 国电南瑞科技股份有限公司 | Magnetic circuit adaptive power grid power flow controller |
-
2009
- 2009-12-01 CN CN200910175293A patent/CN101710698A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087901B (en) * | 2010-12-17 | 2013-12-18 | 北京云电英纳超导电缆有限公司 | Compact iron core structure comprising magnetic bridges |
| CN102087901A (en) * | 2010-12-17 | 2011-06-08 | 北京云电英纳超导电缆有限公司 | Compact iron core structure comprising magnetic bridges |
| CN102315006B (en) * | 2011-05-10 | 2017-04-05 | 戴珊珊 | A kind of permanent-magnet gain transformer |
| CN102315006A (en) * | 2011-05-10 | 2012-01-11 | 戴珊珊 | Permanent magnetic gain voltage transformation device |
| CN103928214A (en) * | 2014-03-26 | 2014-07-16 | 中国科学院电工研究所 | Double-column double-split reactor applied to 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 |
| CN105575634A (en) * | 2016-03-16 | 2016-05-11 | 江苏万邦节能科技股份有限公司 | Adjustable electric reactor used for controlling electric energy quality |
| CN105575634B (en) * | 2016-03-16 | 2017-05-17 | 江苏万邦节能科技股份有限公司 | Adjustable electric reactor used for controlling electric energy quality |
| CN107068354A (en) * | 2016-12-30 | 2017-08-18 | 上海意兰可电力电子设备有限公司 | Three-phase common mode reactor |
| CN107068354B (en) * | 2016-12-30 | 2020-08-14 | 上海意兰可电力电子设备有限公司 | Three-phase common mode reactor |
| 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 |
| CN109378812A (en) * | 2018-12-10 | 2019-02-22 | 武汉大学 | A kind of the magnetic saturation iron core DC Line Fault current limiter and current-limiting method of high inductance no-load voltage ratio |
| CN113257544A (en) * | 2021-05-18 | 2021-08-13 | 赵鑫堂 | Core type permanent magnetic transformer |
| CN114512971A (en) * | 2022-01-13 | 2022-05-17 | 武汉大学 | Hybrid excitation multifunctional saturated iron core alternating current fault current limiter and current limiting method |
| WO2024139941A3 (en) * | 2022-12-26 | 2024-08-15 | 国电南瑞科技股份有限公司 | Magnetic circuit adaptive power grid power flow controller |
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Open date: 20100519 |