CN109995006A - A kind of liquid metal fault current limiter and its current-limiting method - Google Patents
A kind of liquid metal fault current limiter and its current-limiting method Download PDFInfo
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- CN109995006A CN109995006A CN201910171409.2A CN201910171409A CN109995006A CN 109995006 A CN109995006 A CN 109995006A CN 201910171409 A CN201910171409 A CN 201910171409A CN 109995006 A CN109995006 A CN 109995006A
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- starting
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- flow hole
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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
Abstract
The disclosure discloses a kind of liquid metal fault current limiter, comprising: liquid metal, upper copper electrode, lower copper electrode, upper insulating barrier, lower insulating barrier, auxiliary starting the arc aperture, main through flow hole and current limiter main body.The disclosure further discloses a kind of fault current current-limiting method, comprising: 1, the starting the arc aperture starting the arc；2, the main through flow hole starting the arc；3, starting the arc aperture blow-out, main through flow hole continue arcing.The disclosure guarantees specified through-current capability by choosing larger-diameter main through flow hole；The main through flow hole starting the arc is induced by the aperture starting the arc, realizes quick current-limiting response.
Description
Technical field
The disclosure belongs to technical field of electric power, and in particular to a kind of liquid metal fault current limiter and its current limliting side
Method.
Background technique
With the rapid economic development in our country, the requirement to DC power-supply system capacity is higher and higher, and DC grid is short
Appearance of a street amount is also constantly increasing with short circuit current level.Currently, the rupturing capacity of middle pressure dc circuit breaker is not able to satisfy middle pressure still
DC grid capacity of short circuit demand.Therefore, it is necessary to study effective direct fault current limiter, direct current power system is limited
Capacity of short circuit improves the operational reliability of electric system to reduce the design requirement of dc circuit breaker.So far, it applies
Self- recoverage type liquid metal current limiting technique in terms of DC Line Fault current limliting mainly has: magnetic shrinkage type liquid metal current limliting and self energy
Formula liquid metal current limliting.
However there is certain specified through-flow problem in above two current limiting technique: when to ensure shorter current limliting response
Between, the main through flow hole aperture of current limliting keeps smaller, leads to not carry specified through-flow.Therefore, existing current limiter can only be using parallel connection
High-speed mechanism carrying is through-flow, is limited by electric current transfer fault current when fault current occurs.
Summary of the invention
Aiming at the problems existing in the prior art, the disclosure is designed to provide a kind of liquid metal fault current limitation
Device and its current-limiting method, by selecting the main through flow hole of larger aperture specified through-flow to guarantee, and by around main through flow hole
Aperture current injection of circuits induces the main quick starting the arc current limliting of through flow hole, and demand limiter can quickly be rung when ensureing that short trouble occurs
It answers and efficient current limliting.
The disclosure is achieved through the following technical solutions above-mentioned purpose:
A kind of liquid metal fault current limiter, comprising: liquid metal, upper copper electrode, lower copper electrode, it is upper insulation every
Plate, lower insulating barrier, starting the arc aperture, main through flow hole and current limiter main body；Wherein,
The liquid metal is placed in the current limiter main body；
The top of the current limiter main body, another lateral current limiter main body are fixed in the side of the upper insulating barrier
Bottom direction extend；
The bottom of the current limiter main body, another lateral current limiter main body are fixed in the side of the lower insulating barrier
Top extend；
There are gaps between the upper insulating barrier and the lower insulating barrier, form the main through flow hole；
The upper insulation plate extends side to the current limiter bottom part body and is provided with aperture, forms the starting the arc aperture；
Apical position of the upper copper electrode through the upper insulating barrier to the starting the arc aperture；
The lower copper electrode and the upper insulating barrier, the direction of lower insulating barrier are vertical and through the current limiter master
Body.
Preferably, the liquid metal is gallium-indium-tin alloy.
Preferably, the diameter of the main through flow hole is
Preferably, the diameter of the starting the arc aperture is
Preferably, the starting the arc aperture and upper copper electrode, lower copper electrode constitute aperture discharge loop, put for generating pulse
Electric current assists the starting the arc aperture starting the arc.
Preferably, the aperture discharge loop further includes external recharged capacitance, inductance and thyristor.
The disclosure also provides a kind of fault current current-limiting method, includes the following steps:
S100: the starting the arc aperture starting the arc: when generating short circuit current, the conducting of aperture discharge loop assists the starting the arc of starting the arc aperture；
S200: the main through flow hole starting the arc: squeezing to truncation liquid metal around main through flow hole after the starting the arc aperture starting the arc,
Induce the main through flow hole starting the arc；
S300: starting the arc aperture blow-out, main through flow hole continue arcing: reversed arc voltage is established after the main through flow hole starting the arc to short
Road electric current is limited.
Preferably, in step S100, the aperture discharge loop includes starting the arc aperture, recharged capacitance, inductance and brilliant lock
Pipe.
Preferably, in step S100, the aperture discharge loop assists starting the arc aperture to rise by generating impulse discharge current
Arc.
Preferably, in step S200, if the non-starting the arc of main through flow hole, return step S100, until the main through flow hole starting the arc.
Compared with prior art, the disclosure has the beneficial effect that
1, the disclosure chooses the master of larger aperture on the basis of based on traditional self-constriction type liquid metal current limiting technique
Through flow hole can be carried specified through-flow and be avoided using high-speed mechanism, and structure is simpler；
2, the mentality of designing that the disclosure is combined using excitation aperture and main through flow hole aperture, is connected by aperture discharge loop
The starting the arc and the main through flow hole starting the arc is excited afterwards, current limliting response is fast；
3, disclosure structure novel, does not need current-carrying unit in parallel and fast response time, current limliting are high-efficient, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is a kind of topology diagram of liquid metal fault current limiter provided by the invention；
Fig. 2 is a kind of structural schematic diagram of liquid metal fault current limiter provided by the invention；
Fig. 3 (a) to Fig. 3 (c) is that Igniting pattern shows inside a kind of liquid metal fault current limiter provided by the invention
It is intended to；Wherein, Fig. 3 (a) is the starting the arc of starting the arc aperture；Fig. 3 (b) is that starting the arc aperture induces the main through flow hole starting the arc；Fig. 3 (c) is the starting the arc
Aperture blow-out, main through flow hole continue right arc；
The reference numerals are as follows: 1- liquid metal；The upper copper electrode of 2-1；Copper electrode under 2-2；The upper insulating barrier of 3-1；3-2
Lower insulating barrier；4- starting the arc aperture；The main through flow hole of 5-；6- current limiter main body.
Specific embodiment
Below in conjunction with attached drawing 1 to Fig. 3 (c), technical solution in the embodiment of the present invention is clearly and completely retouched
It states, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts,
It shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 2, a kind of liquid metal fault current limiter, comprising: liquid metal 1, upper copper electrode 2-1, under
Copper electrode 2-2, upper insulating barrier 3-1, lower insulating barrier 3-2, starting the arc aperture 4, main through flow hole 5 and current limiter main body 6；Wherein,
The liquid metal 1 is placed in the current limiter main body 6；The current limiter master is fixed in the side of the upper insulating barrier 3-1
The bottom direction at the top of body 6, another lateral current limiter main body 6 extends；The side of the lower insulating barrier 3-2 is fixed on
The top of the bottom of the current limiter main body 6, another lateral current limiter main body 6 extends；The upper insulating barrier 3-1 and institute
It states between lower insulating barrier 3-2 there are gap, forms the main through flow hole 5；The upper insulation plate 3-1 is to the current limiter main body
6 bottoms extend side and are provided with aperture, form the starting the arc aperture 4；The upper copper electrode 2-1 runs through the upper insulating barrier 3-1
To the apical position of the starting the arc aperture 4；The direction of the lower copper electrode 2-2 and upper insulating barrier 3-1, lower insulating barrier 3-2
It is vertical and through the current limiter main body 6.
Above-described embodiment constitutes the complete technical solution of the disclosure.Unlike the prior art: in above-described embodiment,
Aperture selected by main through flow hole 5 is larger, can guarantee specified through-current capability；Pass through 4 starting the arc of starting the arc aperture and induces main through-flow
5 starting the arc current limliting of hole can be realized to the faster current limliting response speed of fault current and higher current limliting efficiency；And above-described embodiment
It is not used in the prior art because of the small high-speed mechanism that must be connected in parallel in main through flow hole aperture, has design structure simply special
Point.
In another embodiment, the liquid metal 1 is gallium-indium-tin alloy.
In another embodiment, the diameter of the main through flow hole 5 is
In the embodiment, main through flow hole aperture is smaller and can not carry specified through-flow compared to the prior art, it is therefore necessary to
Through-flow deficiency is carried using parallel high-speed mechanism, experiments verify that, when the diameter of main through flow hole 5 isWhen,
The specified of 2200A through-flow passes through.In addition, needing exist for the diameter difference, it is emphasized that main through flow hole, can carry
Specified through-flow difference, therefore, through stringent experimental verification, the diameter of main through flow hole 5 isWhen, it can just carry 2200A
It is specified through-flow.And when aperture continues to increase, then the through-flow current value that can be born also increases with it.
In another embodiment, the diameter of the starting the arc aperture 4 is
In the embodiment, the diameter of starting the arc aperture 4 is traditionally arranged to bePreferably 1.5mm.
In another embodiment, the starting the arc aperture 4 and upper copper electrode 2-1, lower copper electrode 2-2, composition aperture discharge back
Road assists 4 starting the arc of starting the arc aperture for generating pulse current.
In another embodiment, the aperture discharge loop further includes external recharged capacitance, inductance and thyristor.
In the embodiment, when systems are functioning properly, thyristor is in an off state, and whole electric currents pass through main through flow hole 5；
When short trouble occurs for system, system triggers turn on thyristors after detecting fault current by controller.It needs exist for
It is bright, after turn on thyristors, access is formed with recharged capacitance, inductance, starting the arc aperture 4 and liquid metal, and then can produce
Raw impulse discharge current assists the smooth starting the arc of starting the arc aperture 4.
In another embodiment, referring to Fig. 3, the disclosure also provides a kind of fault current current-limiting method, includes the following steps:
S100: 4 starting the arc of starting the arc aperture: when generating short circuit current, the conducting of aperture discharge loop assists 4 starting the arc of starting the arc aperture；
When short trouble occurs for system, system triggers turn on thyristors after detecting fault current by controller.It is brilliant
After brake tube conducting, with the formation of upper copper electrode 2-1, lower copper electrode 2-2, recharged capacitance, inductance, starting the arc aperture 4 and liquid metal 1
Access, and then the impulse discharge current auxiliary rapid starting the arc of starting the arc aperture 4 can be generated.
S200: main 5 starting the arc of through flow hole: after 4 starting the arc of starting the arc aperture to main 5 surrounding liquid metal 1 of through flow hole squeezed to
Truncation, induces main 5 starting the arc of through flow hole；
After 4 starting the arc of starting the arc aperture, electric arc carries out continuous extrusion to the liquid metal 1 around main through flow hole 5, until master is through-flow
Liquid metal 1 around hole 5 is truncated by electric arc, then electric arc reaches main through flow hole 5, to induce main 5 starting the arc of through flow hole.
S300: 4 blow-out of starting the arc aperture, main through flow hole 5 continue arcing: establishing reversed arc voltage after main 5 starting the arc of through flow hole
Short circuit current is limited.
After the single pulse discharge current in aperture discharge loop, starting the arc aperture 4 completes arcing, main logical inducing
While 5 starting the arc of discharge orifice, 4 blow-out of starting the arc aperture, the auxiliary starting the arc terminates.
Further, after the main 5 smooth starting the arc of through flow hole, electric arc, which is persistently drawn high, establishes reversed arc voltage, thus to short
Road circuit forms limitation.
In addition, aperture discharge loop produces again if main through flow hole 5 fails the smooth starting the arc under the induction of starting the arc aperture 4
Raw impulse discharge current assists 4 starting the arc of starting the arc aperture, and the liquid metal 1 around main through flow hole 5 is squeezed and lured again
Send out 5 starting the arc of through flow hole main, until the smooth starting the arc of main through flow hole 5.
Although being described above in conjunction with embodiment of the attached drawing to the disclosure, the disclosure is not limited to above-mentioned
Specific embodiments and applications field, above-mentioned specific embodiment are only schematical, directiveness, rather than restricted
's.Those skilled in the art under the enlightenment of this specification and are not departing from disclosure scope of the claimed protection
In the case where, a variety of forms can also be made, these belong to the column of disclosure protection.
Claims (10)
1. a kind of liquid metal fault current limiter, comprising: liquid metal, upper copper electrode, lower copper electrode, upper insulating barrier,
Lower insulating barrier, starting the arc aperture, main through flow hole and current limiter main body；Wherein,
The liquid metal is placed in the current limiter main body；
The top of the current limiter main body, the bottom of another lateral current limiter main body are fixed in the side of the upper insulating barrier
Portion direction extends；
The bottom of the current limiter main body, the top of another lateral current limiter main body are fixed in the side of the lower insulating barrier
Portion extends；
There are gaps between the upper insulating barrier and the lower insulating barrier, form the main through flow hole；
The upper insulation plate extends side to the current limiter bottom part body and is provided with aperture, forms the starting the arc aperture；
Apical position of the upper copper electrode through the upper insulating barrier to the starting the arc aperture；
The lower copper electrode and the upper insulating barrier, the direction of lower insulating barrier are vertical and through the current limiter main body.
2. current limiter according to claim 1, which is characterized in that preferred, the liquid metal is gallium-indium-tin alloy.
3. current limiter according to claim 1, which is characterized in that the diameter of the main through flow hole is
4. current limiter according to claim 1, which is characterized in that the diameter of the starting the arc aperture is
5. current limiter according to claim 1 or 4, which is characterized in that the starting the arc aperture and upper copper electrode, lower copper electrode
Aperture discharge loop is constituted, assists the starting the arc aperture starting the arc for generating impulse discharge current.
6. current limiter according to claim 5, which is characterized in that the aperture discharge loop further includes external precharge
Capacitor, inductance and thyristor.
7. a kind of method that current limiter according to claim 5 carries out fault current current limliting, includes the following steps:
S100: the starting the arc aperture starting the arc: when generating short circuit current, the conducting of aperture discharge loop assists the starting the arc of starting the arc aperture；
S200: the main through flow hole starting the arc: liquid metal around main through flow hole is squeezed to truncation after the starting the arc aperture starting the arc, is induced
The main through flow hole starting the arc；
S300: starting the arc aperture blow-out, main through flow hole continue arcing: reversed arc voltage is established after the main through flow hole starting the arc to short-circuit electricity
Stream is limited.
8. the method according to the description of claim 7 is characterized in that the aperture discharge loop includes the starting the arc in step S100
Aperture, upper copper electrode, lower copper electrode, recharged capacitance, inductance and thyristor.
9. the method according to the description of claim 7 is characterized in that the aperture discharge loop passes through generation in step S100
Impulse discharge current assists the starting the arc of starting the arc aperture.
10. the method according to the description of claim 7 is characterized in that in step S200, if the non-starting the arc of main through flow hole, returns
Step S100, until the main through flow hole starting the arc.
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| CN201910171409.2A CN109995006B (en) | 2019-03-07 | 2019-03-07 | liquid metal fault current limiter and its current limiting method |
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| CN201910171409.2A CN109995006B (en) | 2019-03-07 | 2019-03-07 | liquid metal fault current limiter and its current limiting method |
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| CN114944642A (en) * | 2022-06-09 | 2022-08-26 | 西南交通大学 | Composite energy consumption device based on liquid metal |
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