CN107248729B - A kind of liquid metal current-limiting apparatus and method - Google Patents
A kind of liquid metal current-limiting apparatus and method Download PDFInfo
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- CN107248729B CN107248729B CN201710522333.4A CN201710522333A CN107248729B CN 107248729 B CN107248729 B CN 107248729B CN 201710522333 A CN201710522333 A CN 201710522333A CN 107248729 B CN107248729 B CN 107248729B
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000004888 barrier function Effects 0.000 claims description 42
- 238000009413 insulation Methods 0.000 claims description 42
- 230000005611 electricity Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 229910001128 Sn alloy Inorganic materials 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000000116 mitigating effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 7
- 238000010891 electric arc Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002887 superconductor Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
It includes current detection means, breaker and liquid metal current limiter that the present invention, which provides a kind of liquid metal current-limiting apparatus and method, described device,.Wherein the first anode electrode in liquid metal current limiter, the first cathode electrode and flow through the first rectangular through holes, the second rectangular through holes liquid metal formed normal operating conditions under the first electric current major loop；Second plate electrode, the second cathode electrode and flow through the first circular through hole, the second circular through hole liquid metal formed short trouble when the second current branch.The configuration of the present invention is simple can trigger the starting the arc in time when detecting fault current, realize efficient current limliting, can help the burden for mitigating the various electrical equipments such as breaker especially suitable for limiting mesolow field ac and dc systems fault current.
Description
Technical field
The invention belongs to technical field of circuit control, the in particular to event in limitation high pressure, middle pressure or low voltage switch equipment
Hinder current technique field, more particularly to a kind of liquid metal current-limiting apparatus and method.
Background technique
China's electric system at present is just constantly strided forward towards the direction that higher voltage grade and larger capacity are transmitted electricity, and is increasingly mentioned
High short circuit current and capacity of short circuit brings great threat to the safety and reliability of system, how fast and effeciently to limit
Short circuit current becomes the hot spot of current research.It installs current limiter additional in the line and had both been not necessarily to the currently running mode of altering system,
Have the characteristics that protection is flexible again, is a kind of measure of ideal fault current limiting.Up to the present, it is applied to short circuit
Technology in terms of current limliting mainly has: solid-state short-circuit fault current limiter, series connection current-limiting reactor, superconductive failure current limiter, PTC resistor limit
Stream uses large capcity breaker, limiting fuse and liquid metal current limiter etc..
Solid-state short trouble current limiting technique is a kind of current-limiting mode based on power electric component, mainly by conventional reactance
Device, power electronic devices (controllable power semiconductor device) and controller composition, but device for high-power power electronic exist than
Biggish inherent loss limits its use.
Current-limiting reactor of connecting is the conventional method for current limliting of comparison, but when being worked normally in power grid due to it,
Electric energy can be consumed, unnecessary economic loss is caused.
Superconductive failure current limiter be it is a kind of it is active, from trigger-type, the novel current limiter of self recovery, from last century 80 years
In generation, attracts extensive attention after occurring.Application technology of the superconductor in terms of large-power occasions not yet maturation, reliability at present
It is poor, further, since superconductor is longer by quenching state recovery time, it is difficult to meet wanting for automatic reclosing etc.
It asks, and is limited by superconductor critical current and temperature, making its rated current is only several hundred peaces to two kilo-amperes, and there is also super
The problems such as conductor needs to deposit in liquid nitrogen environment in normal work, and added losses are big.
Using PTC thermistor, its resistance value when short circuit current passes through is in non-linear rising to PTC resistor current limiting technique
Characteristic realizes current limliting purpose, but the major phase material of the thermistor is expanded vulnerable to heat, need to use heat and mechanical strength compared with
Good material is as connector.In addition, in the event of a failure, the resistance value of thermistor can sharply increase, palpus pressure limiting device in parallel,
The problems such as additionally there are recovery time is long, service life is short.
Summary of the invention
The present invention is to overcome the defect or deficiency of above-mentioned short circuit current limitation technology, proposes a kind of liquid metal current-limiting apparatus and side
Method can effectively inhibit short-circuit current, improve the specified through-current capability of current-limiting apparatus, reduce the on-state damage of current-limiting apparatus
Consumption mitigates the burden of the various electrical equipments such as breaker.
The technical solution adopted by the present invention is that: a kind of liquid metal current limiter, including insulation crust, insulating top cover and electricity
Pole, the electrode include first anode electrode, the first cathode electrode, second plate electrode and the second cathode electrode；
The insulation crust, insulating top cover and first anode electrode, the first cathode electrode, second plate electrode and second
Cathode electrode forms an airtight cavity；
The first anode electrode and second plate electrode are set on one end side wall of insulation crust, first cathode
Electrode and the second cathode electrode are set on the other end side wall of insulation crust；
Two pieces of insulating barriers are provided in the airtight cavity, two pieces of insulating barriers surround cavity and in its cavity
It is provided with movable insulation barrier and filled with liquid metal；The insulating barrier is equipped with the first rectangular through holes and the first circle
Shape through-hole, the movable insulation barrier are equipped with the second rectangular through holes and the second circular through hole；First rectangular through holes
Opposite and equal in magnitude with the second rectangular through holes hole heart, first circular through hole is opposite with the second circular through hole hole heart and big
It is small equal；
The first anode electrode, the first cathode electrode and the liquid for flowing through the first rectangular through holes, the second rectangular through holes
State metal forms the first electric current major loop under normal operating conditions；It the second plate electrode, the second cathode electrode and flows through
First circular through hole, the second circular through hole liquid metal formed short trouble when the second current branch.
Preferably, the packed height of the liquid metal be higher than first rectangular through holes and the first circular through hole and
The height of second rectangular through holes and the second circular through hole, and without filling up entire cavity.
Preferably, the liquid metal is gallium-indium-tin alloy.
Preferably, first rectangular through holes and the second rectangular through holes are all larger than first circular through hole and second
The aperture of circular through hole.
Preferably, the aperture of first circular through hole and the second circular through hole is respectively less than 5mm；First rectangle is logical
Vertical direction, that is, entire widths of hole and the second rectangular through holes are respectively less than 10mm.
Preferably, the outside of the insulating barrier is equipped with fixing lug boss, and the fixing lug boss is embedded into the insulation crust
Side wall in.
The present invention also provides a kind of liquid metal current-limiting apparatus, described device includes current detection means, breaker and liquid
State metal restrictor；The liquid metal current limiter is connected with current detection means and breaker.
Preferably, the current detection means includes Rogowski coil, controller, trigger module, thyristor, diode, puts
Capacitor and electric discharge inductance；
The Rogowski coil input terminal is connect with the first electric current major loop that first anode electrode seals in, and the controller is defeated
Enter end to connect with Rogowski coil output end, the controller output end is connect with trigger module, the trigger module and thyristor
Trigger electrode connection, first cathode electrode are connect with breaker；
The discharge capacity and electric discharge inductance are connected in series, what the electric discharge inductance output end was sealed in second plate electrode
The connection of second current branch, second cathode electrode are connect with the positive grade of the thyristor, and the thyristor cathode is put with described
Capacitor, Diode series connection, the discharge capacity are connect with the diodes in parallel.
The present invention also provides a kind of method for carrying out current limliting using liquid metal current-limiting apparatus, the methods are as follows:
When route works normally, rated current is by by first anode electrode, the first cathode electrode and to flow through first rectangular
Shape through-hole, the first electric current major loop progress that the liquid metal of the second rectangular through holes is formed is through-flow；When short trouble occurs,
Controller, which passes through, judges that the current signal of Rogowski coil transmission exports trigger signal to trigger module, and trigger module triggers thyristor
Conducting makes discharge capacity electric discharge generate discharge current, and discharge current is by by second plate electrode, the second cathode electrode and flowing through
First circular through hole, the second current branch progress that the liquid metal of the second circular through hole is formed is through-flow, and it is round logical to flow through first
The liquid metal fluid column of hole and the second circular through hole rapidly attenuates and shrinks the starting the arc, and movable insulation barrier is under the action of arc force
It moves up, while flowing through the liquid metal of the first rectangular through holes and the second rectangular through holes also with the upper of movable insulation barrier
Shifting gradually becomes smaller and shrinks the starting the arc, so that crushing failure at high speed and elongating arc arc column, realize efficient current limliting.
The present invention has following technical characterstic compared with prior art:
(1) movable insulation barrier is equipped with the second rectangular through holes and the second circular through hole.Under route normal running conditions,
Rated current mainly passes through the first electric current major loop where the second rectangular through holes, and second rectangular through holes in the circuit are specified
Through-current capability is strong, and on-state loss is small, has good conductive capability.When short trouble occurs for route, by the electric current in route
Detection device detects fault current, and triggers the second current branch and generate electric current, makes the liquid gold by the second circular through hole
Belong to fluid column and shrink the starting the arc, resulting arc force pushes movable insulation barrier to move up, and passes through the first electric current major loop second
The liquid metal of rectangular through holes also becomes smaller, so that it also shrinks the starting the arc, achievees the purpose that efficient current limliting.
(2) short-circuit current is limited using liquid metal current-limiting apparatus.Electric conductor of the liquid metal as current-limiting apparatus
Contact pressure is not needed, it is deposited in the cavity of a sealing, and breaking course does not have arc-plasma ejection, when failure electricity
When flowing smaller, liquid metal current-limiting apparatus can restore automatically.
(3) current limliting process is accelerated using movable insulation barrier.There are two hole (the second rectangular through holes on movable insulation barrier
With the second circular through hole), the second rectangular through holes are larger, and it is normal through-flow for carrying out, it cannot be timely when fault current generates
The starting the arc, and be added after lesser second circular through hole, the starting the arc can be triggered, in time when detecting fault current so as to add
The current limliting speed of the fast liquid metal current-limiting apparatus.
Detailed description of the invention
Fig. 1 is liquid metal current limiter model schematic；
Fig. 2 is liquid metal current limiter model side sectional view；
Fig. 3 is cross-sectional view of the liquid metal current limiter model along through-hole direction；
Fig. 4 is that liquid metal current limiter is connected schematic diagram with current detection means and breaker；
Fig. 5 (a)-Fig. 5 (e) is the operation principle schematic diagram of liquid metal current-limiting apparatus；
Fig. 6 is the liquid metal contraction starting the arc schematic diagram for flowing through movable insulation barrier through-hole.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples, but not as a limitation of the invention.
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of liquid metal current limiter, including first anode electrode 1a, the first cathode electrode
1b, second plate electrode 2a, the second cathode electrode 2b, insulating barrier 3, movable insulation barrier 4, insulation crust 5, insulating top cover 6.
First anode electrode 1a and second plate electrode 2a are set on one end side wall of insulation crust 5, the first cathode electricity
Pole 1b and the second cathode electrode 2b are set on the other end side wall of insulation crust 5；Insulation crust 5, insulating top cover 6 and the first sun
Pole electrode 1a, the first cathode electrode 1b, second plate electrode 2a and the second cathode electrode 2b form an airtight cavity.It is closed
Two pieces of insulating barriers 3 are provided in cavity, two pieces of insulating barriers 3 surround cavity and are provided with movable insulation barrier in its cavity
4 and be filled with liquid metal 11；Insulating barrier 3 is equipped with the first rectangular through holes 7 and the first circular through hole 8, movable to insulate
Baffle 4 is equipped with the second rectangular through holes 9 and the second circular through hole 10；9 hole of first rectangular through holes 7 and the second rectangular through holes
The heart is opposite and equal in magnitude, and the first circular through hole 8 and the 10 hole heart of the second circular through hole are opposite and equal in magnitude.
First anode electrode 1a, the first cathode electrode 1b and flow through the first rectangular through holes 7, the second rectangular through holes 9
Liquid metal forms the first electric current major loop under normal operating conditions；Second plate electrode 2a, the second cathode electrode 2b and stream
Cross the second current branch when the liquid metal formation short trouble of the first circular through hole 8, the second circular through hole 10.
Further, the packed height of liquid metal is higher than the first rectangular through holes 7 and the first circular through hole 8 and second
The height of rectangular through holes 9 and the second circular through hole 10, and without filling up entire cavity, it causes to fill after preventing the liquid metal starting the arc
Inside is set to damage because pressure is excessive.
Preferably, liquid metal is gallium-indium-tin alloy, is liquid under the metal normal temperature, but its fusing point is only 10 DEG C or so,
For prevent low temperature using when freeze phenomenon, auxiliary heating measures can be carried out in use to it, such as covered with heater strip.
Further, the first rectangular through holes 7 and the second rectangular through holes 9 are all larger than the first circular through hole 8 and the second circle
The aperture of shape through-hole 10.The specific size of first rectangular through holes 7 and the second rectangular through holes 9 is needed according to voltage class and volume
Fixed through-flow grade specifically determines, when voltage class and it is specified through-flow higher ranked when, through hole section need are somewhat larger, thus
On-state loss can be made to reduce；And in voltage class and lower specified through-flow grade, through hole section can be smaller, needs to guarantee
Temperature rise when its is specified through-flow meets national standard.
Preferably, the vertical direction that the first rectangular through holes 7 and the second rectangular through holes 9 are moved along movable insulation barrier 4
I.e. entire widths are shorter (entire widths of the first rectangular through holes 7 and the second rectangular through holes 9 are respectively less than 10mm), it is ensured that can
Dynamic insulation barrier 4 can make two through hole interlock as early as possible after moving, and improve voltage by squeezing electric arc；First rectangle is logical
The horizontal direction of hole 7 and the second rectangular through holes 9, that is, through-hole length is longer, it is ensured that its through-hole has larger cross-section, meets volume
Temperature rise is lower when fixed through-flow.The aperture of first circular through hole 8 and the second circular through hole 10 is generally less than 5mm, and lesser aperture can
The starting the arc can be triggered in time when detecting fault current.
Preferably, the outside of insulating barrier 3 is equipped with fixing lug boss, and fixing lug boss is embedded into the side wall of insulation crust 5, uses
In fixed insulating barrier 3.
As shown in figure 4, liquid metal current limiter connects to form a kind of liquid metal limit with current detection means and breaker
Device is flowed, working principle is as shown in Figure 5.
Wherein, current detection means includes Rogowski coil, controller, trigger module, thyristor, diode, discharge capacity
With electric discharge inductance；Rogowski coil input terminal is connect with the first electric current major loop that first anode electrode 1a is sealed in, controller input
End is connect with Rogowski coil output end, and controller output end is connect with trigger module, and trigger module is connect with IGBT group pole,
First cathode electrode 1b is connect with breaker；Discharge capacity and electric discharge inductance are connected in series, and discharge inductance output end and the second sun
The second current branch connection that pole electrode 2a is sealed in, the second cathode electrode 2b are connect with the positive grade of the thyristor, thyristor cathode
It is connect with discharge capacity, Diode series, discharge capacity is connect with diodes in parallel.
Shown in Fig. 5 (a), when route works normally, the first rectangular through holes 7 and second in liquid metal current limiter are rectangular
Shape through-hole 9 is larger, and rated current mainly passes through the first electric current master where the first rectangular through holes 7 and the second rectangular through holes 9
Circuit, the specified through-current capability in the circuit is strong, and on-state loss is small, has good conductive capability, and liquid metal current-limiting apparatus is kept
Normal operating conditions.At this point, major loop rated current In passes through the first electric current major loop liquid metal flowing current-limiting apparatus.
Shown in Fig. 5 (b), when short trouble occurs for route, the current detection means in route detects fault current, by
Controller handles data, and controller, which passes through, judges that the current signal of Rogowski coil transmission exports trigger signal to trigger module, touching
It sends out module and triggers turn on thyristors, discharge capacity discharges at this time, and discharge current passes through by second plate electrode, the second cathode at this time
The second current branch that electrode and the liquid metal for flowing through the first circular through hole 8, the second circular through hole 10 are formed.
Shown in Fig. 5 (c), with the increase of discharge current, the liquid at movable the second circular through hole of insulation barrier 10 is flowed through
The metal rapid desufflation starting the arc generates air pressure, and movable insulation barrier 4 moves upwards under the action of arc force, insulating barrier 3
Then occur with movable insulation barrier 4 interlaced, so that the flow area of the second rectangular through holes 9 is reduced, promotes
The liquid metal of one electric current major loop also shrinks the starting the arc.
Shown in Fig. 5 (d), as movable insulation barrier 4 moves upwards, insulating barrier 3 and movable insulation barrier 4 are interlaced
Distance it is increasing so that the flow area of the second rectangular through holes 9 further decreases, electric arc is also increasingly longer, electric arc electricity
Resistance increases, and starts to limit the first electric current main circuit current.
Shown in Fig. 5 (e), with moving up for movable insulation barrier 4, electric arc will increase arc resistance, together by further elongation
When fault current begin to decline.Due to the mobility of liquid metal, liquid metal current-limiting apparatus cannot provide lasting breaking shape
State, can not cut-off short circuit current, thus when fault current drop to breaker (CB) can be within the scope of disjunction when, major loop is disconnected
Road device (CB) is opened, and short circuit current is finally cut-off.
In conclusion the method for carrying out current limliting using liquid metal current-limiting apparatus are as follows:
When route works normally, rated current is by by first anode electrode 1a, the first cathode electrode 1b and flowing through first
Rectangular through holes 7, the first electric current major loop progress that the liquid metal of the second rectangular through holes 9 is formed is through-flow；Work as short trouble
When generation, controller, which passes through, judges that the current signal of Rogowski coil transmission exports trigger signal to trigger module, trigger module touching
Turn on thyristors is sent out, so that discharge capacity electric discharge is generated discharge current, discharge current passes through by second plate electrode 2a, the second cathode
The second current branch progress that electrode 2b and the liquid metal for flowing through the first circular through hole 8, the second circular through hole 10 are formed is through-flow,
The liquid metal fluid column for flowing through the first circular through hole 8 and the second circular through hole 10 rapidly attenuates and shrinks the starting the arc, movable insulation stop
Plate 4 moves up under the action of arc force, while flowing through the liquid gold of the first rectangular through holes 7 and the second rectangular through holes 9
Category also gradually becomes smaller and shrinks the starting the arc with moving up for movable insulation barrier 4, so that crushing failure at high speed and elongating arc arc column, are realized high
Imitate current limliting.
As shown in fig. 6, in the liquid metal current limiter, since movable insulation barrier 4 has the second rectangular through holes 9 and the
The structure of two circular through holes 10 makes the liquid metal for flowing through its through-hole have contraction-extended attribute, so that aperture portion fluid column is cut
The current density and magnetic flux density in face are reinforced, and the magnetic flux density of other positions is weaker.Aperture portion fluid column is by powerful Lip river
Human relations magneticaction, so that the liquid metal contraction at this carries out quickly, Joule heat finally makes the liquid metals of this part
Quick-gasifying, action effect is similar to fuse, with liquid metals at the second rectangular through holes and the second circular through hole
It shrinks and gasifies, electric arc starts to light and fast development, until full of electric arc in entire cavity.
The foregoing is merely presently preferred embodiments of the present invention, it cannot be understood as limitation of the scope of the invention,
It should be pointed out that those skilled in the art, without departing from the inventive concept of the premise, can also make several
Modification and improvement, these are all within the scope of protection of the present invention.
Claims (10)
1. a kind of liquid metal current limiter, including insulation crust, insulating top cover and electrode, it is characterised in that:
The electrode includes first anode electrode (1a), the first cathode electrode (1b), second plate electrode (2a) and the second cathode
Electrode (2b)；
The insulation crust (5), insulating top cover (6) and first anode electrode (1a), the first cathode electrode (1b), second plate electricity
Pole (2a) and the second cathode electrode (2b) form an airtight cavity；
The first anode electrode (1a) and second plate electrode (2a) are set on one end side wall of insulation crust (5), described
First cathode electrode (1b) and the second cathode electrode (2b) are set on the other end side wall of insulation crust (5)；
Two pieces of insulating barriers (3) are provided in the airtight cavity, two pieces of insulating barriers (3) surround cavity and in its cavity
Inside it is provided with movable insulation barrier (4) and filled with liquid metal (11)；The insulating barrier (3) is equipped with the first rectangle
Through-hole (7) and the first circular through hole (8), the movable insulation barrier (4) are equipped with the second rectangular through holes (9) and the second circle
Through-hole (10)；First rectangular through holes (7) are opposite and equal in magnitude with the second rectangular through holes (9) hole heart, and described first
Circular through hole (8) is opposite and equal in magnitude with the second circular through hole (10) hole heart；
The first anode electrode (1a), the first cathode electrode (1b) and to flow through the first rectangular through holes (7), the second rectangle logical
The liquid metal in hole (9) forms the first electric current major loop under normal operating conditions；The second plate electrode (2a), the second yin
Pole electrode (2b) and flow through the first circular through hole (8), the when the liquid metal of the second circular through hole (10) forms short trouble
Two current branch.
2. liquid metal current limiter according to claim 1, it is characterised in that:
The packed height of the liquid metal (11) be higher than first rectangular through holes (7) and the first circular through hole (8) and
The height of second rectangular through holes (9) and the second circular through hole (10), and without filling up entire cavity.
3. liquid metal current limiter according to claim 1, it is characterised in that:
The liquid metal is gallium-indium-tin alloy.
4. liquid metal current limiter according to claim 1, it is characterised in that:
First rectangular through holes (7) and the second rectangular through holes (9) are all larger than first circular through hole (8) and the second circle
The aperture of shape through-hole (10).
5. liquid metal current limiter according to claim 4, it is characterised in that:
The aperture of first circular through hole (8) and the second circular through hole (10) is respectively less than 5mm.
6. liquid metal current limiter according to claim 4, it is characterised in that:
Broadside and movable insulation barrier (4) direction of motion in first rectangular through holes (7) and the second rectangular through holes (9)
In parallel, and broadside is less than long side.
7. liquid metal current limiter according to claim 1, it is characterised in that:
The outside of the insulating barrier (3) is equipped with fixing lug boss, and the fixing lug boss is embedded into the side wall of the insulation crust (5)
It is interior.
8. a kind of liquid metal current-limiting apparatus, it is characterised in that:
Described device includes current detection means, breaker and the described in any item liquid metal current limiters of claim 1 to 7；
The liquid metal current limiter is connected with current detection means and breaker.
9. current-limiting apparatus according to claim 8, it is characterised in that:
The current detection means includes Rogowski coil, controller, trigger module, thyristor, diode, discharge capacity and electric discharge
Inductance；
The Rogowski coil input terminal is connect with the first electric current major loop that first anode electrode (1a) seals in, and the controller is defeated
Enter end to connect with Rogowski coil output end, the controller output end is connect with trigger module, the trigger module and thyristor
Trigger electrode connection, first cathode electrode (1b) connect with breaker；
The discharge capacity and electric discharge inductance are connected in series, what the electric discharge inductance output end was sealed in second plate electrode (2a)
The connection of second current branch, second cathode electrode (2b) connect with the positive grade of the thyristor, the thyristor cathode and institute
Discharge capacity, Diode series connection are stated, the discharge capacity is connect with the diodes in parallel.
10. a kind of method for carrying out current limliting using liquid metal current-limiting apparatus, it is characterised in that: specified when route works normally
Electric current is by by first anode electrode (1a), the first cathode electrode (1b) and flowing through the first rectangular through holes (7), the second rectangle
The first electric current major loop that the liquid metal of through-hole (9) is formed carries out through-flow；When short trouble occurs, controller passes through judgement
The current signal of Rogowski coil transmission exports trigger signal to trigger module, and trigger module triggers turn on thyristors, makes electric discharge electricity
Discharge capacitor generates discharge current, and discharge current is by by second plate electrode (2a), the second cathode electrode (2b) and flowing through first
Circular through hole (8), the second current branch progress that the liquid metal of the second circular through hole (10) is formed is through-flow, flows through the first circle
The liquid metal fluid column of through-hole (8) and the second circular through hole (10) rapidly attenuates and shrinks the starting the arc, and movable insulation barrier (4) is in electricity
It is moved up under the action of arc power, while flowing through the liquid metal of the first rectangular through holes (7) and the second rectangular through holes (9)
The starting the arc is gradually become smaller and shrinks with moving up for movable insulation barrier (4), so that crushing failure at high speed and elongating arc arc column, are realized efficient
Current limliting.
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| CN108711841B (en) * | 2018-05-31 | 2020-01-31 | 西安交通大学 | fault current limiting unit and method for direct current system |
| CN109637874B (en) * | 2018-11-21 | 2020-01-17 | 云南靖创液态金属热控技术研发有限公司 | Liquid metal current limiter |
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