CN109301804B - A kind of variable impedance restrictor apparatus based on repulsive force mechanism - Google Patents
A kind of variable impedance restrictor apparatus based on repulsive force mechanism Download PDFInfo
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- CN109301804B CN109301804B CN201811279523.9A CN201811279523A CN109301804B CN 109301804 B CN109301804 B CN 109301804B CN 201811279523 A CN201811279523 A CN 201811279523A CN 109301804 B CN109301804 B CN 109301804B
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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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Abstract
The invention discloses a kind of variable impedance restrictor apparatus based on repulsive force mechanism, which is a kind of variable impedance type FCL, is connected in system line.When system operates normally, impedance very little, and in the event of a failure, the change of current is not needed, impedance can become larger rapidly, so that failure does not arrive reach to peak value also and can be limited.When electric system operates normally, current limiter moving contact and static contact are in close contact the present apparatus, and resistance value is minimum, almost without electric energy loss, to the influence very little of system and system relay protection；For the present invention during current limliting, fast response time, impedance variations are steady, and metering function can be played when fault current just rises, and realize steady current limliting truly.
Description
Technical field
The present invention relates to high-tension circuit engineering device technique field more particularly to a kind of variable impedance current limlitings based on repulsive force mechanism
Device device.
Background technique
With industry and the increase of electricity consumption of resident, the capacity of short circuit of electric system is increasing, corresponding maximum short circuit
Electric current is also increasing, and even more than standard provides.This is to the short circuit current tolerance of system equipment and cut-offfing for breaker
The huge pressure that ability generates.Therefore it needs the route exceeded to short circuit current to carry out current limliting, breaks down to prevent locking system
When to system equipment generate impact, avoid breaker failure of interruption.Fault current limiting generally uses route series connection current limliting at present
Reactor uses fault current limiter (Fault Current Limiter, FCL).
Series connection current-limiting reactor can be effectively reduced fault current peak value, but since reactor will be connected on always system
It is interior, very big loss and voltage drop can be generated when system operates normally, while very big shadow is caused to relay protection setting etc.
It rings.The main purpose of fault current limiter is to improve the impedance of faulty line rapidly before fault current rises to high value, from
And reduce the peak value of fault current to be conducive to cut-off.It generally can be divided into superconduction type, power electronics type, economical and mixed type.
(1) superconduction type FCL can realize the integration of detection, conversion and current limliting under high voltages, can respond in several milliseconds, to limit
Fault current, but superconductor technology is not mature enough at present, restricts application industrially, and energy consumption is big at runtime；(2) power electronics
Type FCL points are solid-state version, mode of resonance and series compensation type, and control rapid flexible is easily achieved the flexible of integrated multi
AC transmission system (FACTS) control, but cost is very high；(3) economical FCL simplicity, cheap, loss small, high reliablity, electromagnetism
Good compatibility, fuel factor ability be strong, without separately setting relay protection, restores automatically after automatic quickly investment, failure removal, but be difficult to
Solve the problems, such as the series and parallel and energy-absorbing of ZnO arrester；(4) mixed type FCL reduces conduction loss, danger caused by fault electric arc
Evil is effectively suppressed, and but its structure is complex, at high cost.
The current fault current limiter of comprehensive analysis can be divided into two kinds from principle, and one is change of current type FCL, most limits
Flowing device is all change of current type FCL, it is intended to it introduces big impedance to connect by changing line construction and achievees the purpose that current limliting, in addition one
Dividing is variable impedance type FCL, it is intended to which the impedance for changing the element being serially accessed to the circuit achievees the purpose that current limliting.Former mode is all
The change of current for causing fault current inevitably causes overvoltage and shoves in commutation course, handles the two then significantly
The complexity of occluder configurations is increased, while commutation circuit itself is also very complicated, this provides for improved costs.And latter approach
The change of current is not needed then, but the rapid variation of circuit element impedance requires element to have preferable impedance characteristic, current superconduction
Body, positive temperature coefficient resistor etc. are all difficult to meet the requirement of industrial application.
Summary of the invention
According to problem of the existing technology, the invention discloses a kind of, and the variable impedance current limiter based on repulsive force mechanism is filled
It sets, specifically includes, ceramic electrical balk ring, upper conducting rod, lower conducting rod, moving contact, static contact, upper end cover, lower cover, bellows；
The upper end cover and the lower cover are fixedly connected on the upper and lower ends of ceramic electrical balk ring；The upper conducting rod passes through
Upper end cover is fixedly connected with static contact, and the upper conducting rod is closely connect with upper end cover；The lower conducting rod pass through lower cover with
Moving contact is fixedly connected, and the lower conducting rod is fixedly connected with lower cover by the bellows, the ceramic electrical balk ring, on lead
Electric pole, lower conducting rod, upper end cover, lower cover and bellows, which are cooperatively connected, forms the internal obturator for vacuum medium；
Under working condition: the device is connected line attachment and by under described by the upper conducting rod and lower conducting rod
Conducting rod is connect with repulsive force mechanism；
When normal operation, closing retention force is provided by repulsive force mechanism, the moving contact and static contact is made to be in close contact conducting
Route；
When breaking down, the moving contact and static contact are pulled open by repulsive force mechanism separating brake, during separating brake, the moving contact
It is contacted with the ceramic electrical balk ring, line current passes through the upper conducting rod, static contact, ceramic electrical balk ring, moving contact, lower conduction
Bar circulation, so that the ceramic resistor ring portion sub-resistance is inserted into route；The ceramic electrical resistance value of insertion is with the moving contact point
When lock moving contact and static contact open away from increase and increase；After trouble shooting, repulsive force mechanism closes a floodgate, and makes the ceramics for being inserted into route
Resistance value reduces, until the moving contact and static contact in-place closing.
The ceramic electrical balk ring is that have certain thickness, and the ceramic electrical balk ring is circular rings, straight-flanked ring, vesica piscis
Or circular profile.
The ceramic electrical balk ring includes being not limited to ZnO ceramic resistor material.
It is arranged to vacuum inside the device or filled with dielectric.
By adopting the above-described technical solution, a kind of variable impedance current limiter dress based on repulsive force mechanism provided by the invention
It sets, which is a kind of variable impedance type FCL, is connected in system line.When system operates normally, impedance very little, and
In the event of a failure, the change of current is not needed, impedance can become larger rapidly, so that failure does not arrive reach to peak value also and can be limited
System.When electric system operates normally, current limiter moving contact and static contact are in close contact the present apparatus, and resistance value is minimum, almost without
Electric energy loss, to the influence very little of system and system relay protection；The present invention is during current limliting, fast response time, and impedance becomes
Change steadily, metering function can be played when fault current just rises, realizes steady current limliting truly.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of novel variable impedance restrictor apparatus structural schematic diagram based on repulsive force mechanism of the present invention；
Fig. 2 is the top view of Fig. 1 structure.
Fig. 3 is a kind of application schematic diagram of the novel variable impedance restrictor apparatus based on repulsive force mechanism of the present invention.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, with reference to the attached drawing in the embodiment of the present invention, to this
Technical solution in inventive embodiments carries out clear and complete description:
A kind of variable impedance restrictor apparatus based on repulsive force mechanism as shown in FIG. 1 to FIG. 3 include its vertical cross section and
Horizontal sectional drawing, as shown in Figure 1, the present embodiment device include: ceramic electrical balk ring 101, static contact 102, moving contact 103, on lead
Electric pole 104, lower conducting rod 105, upper end cover 106, lower cover 107, bellows 108.
The upper end cover 106 and the lower cover 107 are fixed on 101 upper and lower ends of ceramic electrical balk ring；
The upper conducting rod 104 is closely connect with upper end cover 106, and is passed through upper end cover 106 and connect with static contact 102；
The lower conducting rod 105 is connect with lower cover 107 by the bellows 108, and passes through lower cover 107 and dynamic touching
First 103 connection；
The ceramic electrical balk ring 101, upper conducting rod 104, lower conducting rod 105, upper end cover 106, lower cover 107 and bellows
108 one closed entirety of composition, internal is vacuum medium；
Variable impedance current limiter of the present invention can be with tandem working in power circuit.
At work, device is by the upper conducting rod 104 and lower conducting rod 105, line attachment of connecting, and by described
Lower conducting rod 105 is connect with repulsive force mechanism；
When normal operation, closing retention force is provided by repulsive force mechanism, connects the moving contact 103 and static contact 102 closely
Route is connected in touching；
When breaking down, by repulsive force mechanism separating brake, the moving contact 103 and static contact 102 are pulled open, during separating brake, institute
It states moving contact 103 to contact with the ceramic electrical balk ring 101, line current passes through the upper conducting rod 104, static contact 102, ceramics
Resistance ring 101, moving contact 103, lower conducting rod 105 circulate, so that 101 partial ohmic of ceramic electrical balk ring is inserted into route；
The ceramic electrical resistance value of insertion with when 103 separating brake of moving contact moving contact 103 and static contact 102 open away from increase and increase；
Separating brake in place after, the ceramic electrical resistance value of insertion is maximum；
After trouble shooting, repulsive force mechanism closes a floodgate, and reduces the ceramic electrical resistance value for being inserted into route, until the moving contact
103 can be ignored with 102 in-place closing of static contact, resistance value minimum at this time for micro-ohm grade.
A kind of application schematic diagram of the novel variable impedance restrictor apparatus based on repulsive force mechanism of Fig. 3 present invention；Such as Fig. 3
Shown, the device of the present embodiment includes:
Quick variable resistance 201, high-speed switch 202, current-limiting reactor 203；
The quick variable resistance 201, by the lower conducting rod and repulsive force mechanism group of variable impedance restrictor apparatus in Fig. 1
At, failure occur when can carry out separating brake rapidly, increase resistance value quickly；
The high-speed switch 202 is connected with quick variable resistance 201, then in parallel with current-limiting reactor 203 again, composition
Current limiter；
The resistance of the quick variable resistance 201 is generally configured to the impedance value much larger than current-limiting reactor 203；
When an error occurs, the high-speed switch 202 carries out separating brake movement with the quick variable resistance 201 simultaneously；
Before fault current zero passage, the high-speed switch 202 is due to the effect of electric arc, branch current where cannot cut-offfing,
Branch impedance where it is the resistance value of the quick variable resistance 201, with quick 201 separating brake of variable resistance,
The branch impedance becomes larger rapidly；
Since the electric current of the 203 place branch of current-limiting reactor cannot be mutated, opened in the quick variable resistance 201
When beginning to change, the impedance of the 203 place branch of current-limiting reactor is infinity；With the quick variable resistance 201
Resistance increases, and both end voltage also increases, so that it is gradually increased the electric current of the 203 place branch of current-limiting reactor, short circuit
Electric current is gradually transferred to the 203 place branch of current-limiting reactor；
When quick 201 separating brake of variable resistance in place when, due to its resistance be much larger than current-limiting reactor 203 impedance
Value, and the electric current of the current-limiting reactor 203 lags behind the electric current of quick variable resistance 201, fault current is big at this time
Part is transferred in current-limiting reactor 203.
When the quick 201 place branch current zero passage of variable resistance, the high-speed switch 202 cut-offs the branch,
Fault current is fully transferred in the current-limiting reactor 203, to realize current limliting.
In the embodiment, since the effect of the quick variable resistance 201 of apparatus of the present invention is not required to after the failure occurs
Fault current zero passage is waited, current-limiting impedance can be put into and realize current limliting, meanwhile, current-limiting reactor is transferred in fault current
When, since impedance is there is no mutation, overvoltage will not be generated, avoids change of current type fault current limiter in commutation course
It overvoltage and shoves, reduces the change of current, protection and control loop, while compared with the fault current limiter of the not change of current, impedance becomes
It is fast to change speed, does not quench, control is simple.
It is arranged to vacuum inside the device or filled with dielectric.
When electric system operates normally, current limiter moving contact and static contact are in close contact the present invention, and resistance value is minimum, almost
There is no electric energy loss, to the influence very little of system and system relay protection；The present invention is during current limliting, fast response time, resistance
Resistanceization is steady, and metering function can be played when fault current just rises, and realizes steady limit truly
Stream.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of variable impedance restrictor apparatus based on repulsive force mechanism, characterized by comprising: ceramic electrical balk ring, upper conduction
Bar, lower conducting rod, moving contact, static contact, upper end cover, lower cover, bellows；
The upper end cover and the lower cover are fixedly connected on the upper and lower ends of ceramic electrical balk ring；The upper conducting rod passes through upper end
Lid is fixedly connected with static contact, and the upper conducting rod is closely connect with upper end cover；The lower conducting rod passes through lower cover and dynamic touching
Head is fixedly connected, and the lower conducting rod is fixedly connected with lower cover by the bellows, the ceramic electrical balk ring, upper conduction
Bar, lower conducting rod, upper end cover, lower cover and bellows, which are cooperatively connected, forms the internal obturator for vacuum medium；
Under working condition: the device is by the upper conducting rod and lower conducting rod series connection line attachment and passes through the lower conduction
Bar is connect with repulsive force mechanism；
When normal operation, closing retention force is provided by repulsive force mechanism, the moving contact and static contact is made to be in close contact conducting route；
When breaking down, the moving contact and static contact are pulled open by repulsive force mechanism separating brake, during separating brake, the moving contact and institute
The contact of ceramic electrical balk ring is stated, line current passes through the upper conducting rod, static contact, ceramic electrical balk ring, moving contact, lower conducting rod stream
It is logical, so that the ceramic resistor ring portion sub-resistance is inserted into route；When the ceramic electrical resistance value of insertion is with the moving contact separating brake
Moving contact and static contact open away from increase and increase；After trouble shooting, repulsive force mechanism closes a floodgate, and makes the ceramic resistor for being inserted into route
Value reduces, until the moving contact and static contact in-place closing.
2. a kind of variable impedance restrictor apparatus based on repulsive force mechanism according to claim 1, it is further characterized in that: institute
Stating ceramic electrical balk ring is to have certain thickness, and the ceramic electrical balk ring is circular rings, straight-flanked ring, vesica piscis or cyclic annular outer
Shape.
3. a kind of variable impedance restrictor apparatus based on repulsive force mechanism according to claim 2, it is further characterized in that: institute
Stating ceramic electrical balk ring includes being not limited to ZnO ceramic resistor material.
4. a kind of variable impedance current limiter dress based on repulsive force mechanism described in -3 any one claims according to claim 1
It sets, it is further characterized in that: it is arranged to vacuum inside the device or filled with dielectric.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811279523.9A CN109301804B (en) | 2018-10-30 | 2018-10-30 | A kind of variable impedance restrictor apparatus based on repulsive force mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811279523.9A CN109301804B (en) | 2018-10-30 | 2018-10-30 | A kind of variable impedance restrictor apparatus based on repulsive force mechanism |
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| CN109301804A CN109301804A (en) | 2019-02-01 |
| CN109301804B true CN109301804B (en) | 2019-10-29 |
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| CN112366667B (en) * | 2020-11-02 | 2021-08-10 | 西安交通大学 | Integrated fast switch type current limiter and method for matching integrated fast switch type current limiter with circuit breaker |
Citations (4)
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|---|---|---|---|---|
| US6664875B2 (en) * | 2001-01-17 | 2003-12-16 | Igc-Superpower, Llc | Matrix-type superconducting fault current limiter |
| CN101256907A (en) * | 2008-03-20 | 2008-09-03 | 上海交通大学 | Non-arc breaking circuit based on variable capacitance and method thereof |
| CN101394085A (en) * | 2008-10-29 | 2009-03-25 | 西安交通大学 | Current limiting device based on quick converting switch and liquid metal current limiting device, current limiting method therefor |
| CN108448551A (en) * | 2018-03-23 | 2018-08-24 | 西安交通大学 | A kind of exchange current limiter and its current-limiting method |
-
2018
- 2018-10-30 CN CN201811279523.9A patent/CN109301804B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6664875B2 (en) * | 2001-01-17 | 2003-12-16 | Igc-Superpower, Llc | Matrix-type superconducting fault current limiter |
| CN101256907A (en) * | 2008-03-20 | 2008-09-03 | 上海交通大学 | Non-arc breaking circuit based on variable capacitance and method thereof |
| CN101394085A (en) * | 2008-10-29 | 2009-03-25 | 西安交通大学 | Current limiting device based on quick converting switch and liquid metal current limiting device, current limiting method therefor |
| CN108448551A (en) * | 2018-03-23 | 2018-08-24 | 西安交通大学 | A kind of exchange current limiter and its current-limiting method |
Non-Patent Citations (1)
| Title |
|---|
| 基于快速真空断路器的短路电流限制技术;吴明;《安徽电力》;20180630;第35卷(第2期);第34-38页 * |
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