CN105449653B - The device of volitional check short-circuit current in a kind of AC network - Google Patents
The device of volitional check short-circuit current in a kind of AC network Download PDFInfo
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- CN105449653B CN105449653B CN201511035150.7A CN201511035150A CN105449653B CN 105449653 B CN105449653 B CN 105449653B CN 201511035150 A CN201511035150 A CN 201511035150A CN 105449653 B CN105449653 B CN 105449653B
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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Abstract
The present invention relates to a kind of device of volitional check short-circuit current in AC network.It is low-power consumption to be intended to make during device normal operation, and circuit can increase the reactance value number of reactor when occurring short-circuit, mitigates the extent of damage of short trouble.The device has 20~500KV ac bus, feeder breaker, feeder current transformer and two disconnecting switch are connected on power transmission feeder line successively, a variable reactance current limiter is sealed between two disconnecting switch of feeder line, variable reactance current limiter includes principal reactance device, air gap reactor, main circuit breaker and the high anti-reactor being made up of iron-core workpiece, armature winding and secondary windings, armature winding is serially connected among feeder line, is the Ith loop；Secondary windings forms the IIth loop with air gap reactor and main circuit breaker；The high anti-reactor for being parallel to secondary windings both ends forms the IIIth loop；Meanwhile detection control loop is formed by feeder current transformer, secondary windings side current transformer and the relay protection control system that is installed in electric substation.
Description
Technical field
The present invention relates to a kind of device of volitional check short-circuit current in AC network.Prevent the high-tension electricity in power network
Gas equipment is damaged because of short trouble.
Background technology
At present, with the expanding day by day of China's power network scale, load increases rapidly in power system, particularly 2014
The end of the year, the capacity of installed generator in China have reached 12.5 hundred million kilowatts, ranked first in the world, such numerous, large sized unit throwing
Enter the interconnection of operation and each large regional grid so that Power System Shortcuts levels of current also increasingly increases, many areas are particularly coastal
The short circuit current level of the developed area such as power network such as Shanghai, Jiangsu, Zhejiang, Guangdong, has met or exceeded《Electric power is advised
Journey》The maximum permissible value limited.
In 500kv the and 220kv transformer stations in the big city of some load densities and area, it is contemplated that short circuit current level will
100KA can be can exceed that.Data shows that the possible maximum short circuit current periodic component of the three gorges hydropower plant can reach 300KA.State at present
Producible switchgear on border, such as the maximum drop-out current of 500KV voltage class is 80KA in the world at present, if not in time
Take effective technical measures limiting short-circuit current, then power network is would potentially result in power network development from now on without high pressure
Breaker (switch) is optional, and this means that the uncontrollable management and running for controlling bulk power grid.Therefore, this is one to grid company
It is individual very urgently to need the big problem solved.And it is referred to as electric network fault for the device that limitation short-circuit current value makes
Current limiter, referred to as (FCL).
Main technique requirements to electric network fault current limiter (FCL) are：
Zero impedance or slight resistance are shown as in power network normal operation, for power consumption close to zero, maximum is no more than conveying work(
The 0.25~1% of rate, it is rapid that high impedance is presented to contain fault current when short trouble occurs for power network.It is required that responsiveness
Hurry up, the reaction time be less than 10ms even shorter (several milliseconds), that is, be restricted to desired value less than half；With fast automatic reset
Function, repeatedly action can be achieved；The equipment such as the breaker that reliability should be higher than that while run, equipment operation maintenance cost are low.
But in existing current limiting technique, it there are problems that as follows：
1st, the metering function of blocked impedance and semiconductor element is bigger, then the loss ratio in normal work is bigger；
2nd, superconductive current limiter has good current limitation effect, but needs the running environment of ultralow temperature, nearly 100,000,000 yuan of equipment investment with
And operation expense is high, is difficult to promote in engineering.
3rd, retrieved through applicant, patent such as Ningxia electric power company's Electric Power Section institute Authorization Notice No. of same type
CN103023000B, the problem of program is present be, due to being usually by speed-sensitive switch and current-limiting reactor parallel running, when short
When road electric current occurs, protective relaying device need after first speed-sensitive switch is disconnected, current-limiting reactor, which can just seal in, to be played current limliting and makees
With, but actual conditions be any speed-sensitive switch within the time of the upper half-wave of first cycle of alternating current circuit transcient short circuit time i.e.
It is theoretical according to switching arc in 0.01 second (10ms), it is the electric arc that can not be completely eliminated in arc-chutes, and can only be at first
After the zero crossing of cycle, i.e. after 10ms (millisecond) could arc extinguishing, this means that will above-mentioned reactance current limiter be just after 10ms
Can effectively it devote oneself to work.Also clearly write exactly in patent specification [0045] section " first intelligent high-speed switch exists
Disconnected at once in 15ms, by the input current limliting operation of the first current limiter ".And in power network actual conditions, first after short circuit
Cycle (i.e. in 0~10ms) is the most urgent to limiting short-circuit current value, because being now placed in the breaker of current-limiting reactor lower end
It is possible to act, if waiting until putting into current limiter after 15ms again, the breaker of lower end may be because that arc-chutes blocking is held
The deficiency of amount, and can not blow-out, electric arc is constantly in fired state so that circuit can not cut-off or cause breaker
Blast.
The content of the invention
The technical problem to be solved in the present invention is：A kind of dress of volitional check short-circuit current in AC network is provided
Put, the device is low-power consumption (about 5 ‰~1%) in normal operation, and when circuit occurs short-circuit can rapidly,
Significantly, the reactance value number of mutation ground increase reactor, the short circuit current of 20~50% values should at least be limited, hence it is evident that mitigate short
The extent of damage of road failure.
The technical solution adopted in the present invention is：The device of volitional check short-circuit current in AC network, have 20
~500KV ac bus, feeder breaker, feeder current transformer and two disconnecting switch are connected to successively on power transmission feeder line,
It is characterized in that sealing in a variable reactance current limiter between two disconnecting switch of feeder line, the variable reactance current limiter includes
Principal reactance device, air gap reactor, main circuit breaker and the high anti-reactor being made up of iron-core workpiece, armature winding and secondary windings, its
In, armature winding is serially connected among feeder line, is the Ith loop；Secondary windings is formed the IIth time with air gap reactor and main circuit breaker
Road；The high anti-reactor for being parallel to secondary windings both ends forms the IIIth loop；Meanwhile by feeder current transformer, secondary windings
Side current transformer and the relay protection control system being installed in electric substation form detection control loop.
A kind of scheme seals in standby disjunction component, this is standby in the IIth loop between main circuit breaker and secondary windings end
Include back-up breaker and fastp-acting fuse in parallel with disjunction component.
Another scheme only seals in fastp-acting fuse in the IIth loop between main circuit breaker and secondary windings end.
Load ratio bridging switch is sealed between armature winding and the outgoing line side disconnecting switch.
The air gap reactor includes being wound with the secured core of coil, the secured core in three-back-shaped, two vertical side arms it
Between be provided with parallel sliding shackle, taken over a job dynamic iron core by roller pin on a side arm of secured core, the activity of movable core
Rectify the end face to another side arm and keep gap delta in normality, spring, slide lock are provided between movable core and sliding shackle
Buckle and be also equipped with rubber cushion blocks.The gap delta control is in 30~100mm.
The main circuit breaker is SF 6 high-voltage circuit breaker, oil-break or vacuum circuit breaker.
The fastp-acting fuse is detonator formula fastp-acting fuse, and actuation time is 1~5ms.
The anti-reactor of height is reactor of the high impedance with air gap, and its reactance resistance is air gap reactor higher limit
10~20 times.
The beneficial effects of the invention are as follows：The present apparatus raises bus automatically by being derived from the energy of electric network fault short circuit current
Magnitude of voltage, normality voltage is set up in the loop again, so that system is automatically reverted to the short circuit current scope that can be born
In.The existing gradational breaker of present apparatus collaboration timely and effectively contains short circuit current in the very first time that short trouble occurs,
Ensure the safe for operation of network system.
Brief description of the drawings
Fig. 1 is the electrical wiring schematic diagram of the embodiment of the present invention 1.
Fig. 2 is the electrical wiring schematic diagram of the embodiment of the present invention 2.
Fig. 3 is the three-phase wiring schematic diagram of principal reactance device in the present invention.
Fig. 4 is the structure chart of air gap reactor in the present invention.
Fig. 5 is the change curve after the voltage short circuit of principal reactance device armature winding side in the present invention.
Fig. 6 is that alternating current sine wave changes over time curve map.
Embodiment
As shown in fig. 6, due to the invention solves a key issue be short trouble generation after AC system
The upper half-wave of first cycle is 0~10ms (i.e. 0.01 second) interior in sine wave, among this current limiter is sealed in into the Ith loop,
And short circuit current is limited 30~45% in 20ms.Realize that three current limliting processes of this purpose are as follows：
1st, in 0~5ms periods：
Equivalent to one doublewound transformer of principal reactance device B in the design, its first side winding (armature winding N1) stream
When crossing rated current Ie, in secondary side winding (secondary windings N2) it is in short-circuit condition.If now rated current reaches 2000A,
Because the magnetic potential disequilibrium of the winding of transformer first and second will produce about 0.5~1%Ue (specified electricity in first winding
Pressure) magnitude of voltage, the inductive voltage value takes U in this programme0=6.5 ‰ Ue=0.0065 × 500KV=3.25KV.It is short when having
Road electric current by when, the induced voltage can with the multiple of short circuit current and the ratio between rated current and it is linearly increasing, if this
When, short circuit current is 50KA (i.e. 50000 amperes), that is, 25 times for rated current 2KA, thus now in armature winding N1
Caused voltage is U1=3.25KV × 25=81.25KV is uneven by magnetic potential by principal reactance device B that is, within 0~5ms times
Current limliting transient voltage is up to 81.25KV caused by weighing apparatus, and due to the generation of this magnitude of voltage, the effect to current limliting can account for 5~10%
Contribution rate, if the oblique line of " 1 " in the 0-A in Fig. 5 is U in 0~5ms of transcient short circuit time1Change curve.Therefore in 0~5ms
Current limliting contribution is mainly principal reactance device B difference induced potential U caused by magnetic potential imbalance caused by interior1It is and caused.
2nd, after short trouble occurs in 5~10ms periods：
As shown in figure 4, when short-circuit current flows through the time more than 5ms or so, principal reactance device B secondary side is (secondary
Level winding N2) electric current causes air gap reactor DK movable core 1-1 and secured core 1-2 to close, air gap delta is disappeared, according to
Reactor principle, reactor reactance value are：
Wherein：In formula：F is frequency, f=50Hz；W is the number of turn of reactor winding；μ r are that iron core is relative
Permeability, 300~1000 are taken for silicon steel sheet；Az is that m is accumulated in core of reactor post net section2；Kdp is core lamination stack coefficient；N is
The quantity of reactor air gap；δ gas length (unit m) between iron core cake of electric reactor.
After air gap delta disappears, total magnetic permeability mu r also increased dramatically, and make the voltage U for flowing through air gap reactor DK3Also drastically increase
Greatly, now secondary circuit short-circuit electric current I3Air gap reactor DK is still flowed through, causes U3The value of value increases by 20~60 times, this amount
Value has raised principal reactance device B secondary sides (secondary windings N significantly2) voltage U2Value, and U2Raising, finally make in the Ith loop
U1Magnitude of voltage is brought up to about 155-200KV level by 81.25KV, reflects that section A-B " 2 " number line in Figure 5 is voltage U1Directly
Steep formula is mutated increased curve, due to U1Raising principal reactance device B impedance is added about 10~20% again, i.e., 5~
Obvious metering function is served in 10ms.
3rd, after short trouble occurs in 10~20ms periods：
As shown in Figure 1 and Figure 5, by 0~5ms~after the 10ms times, moved respectively by principal reactance device B and air gap reactor DK
After work, U1Voltage (by taking 500KV system design current limiters as an example), by initial U0=3.25kv has risen to about 155kv.Now
Still there is larger sensing short circuit current to flow through secondary windings N2, actually main circuit breaker DL-1 was begun in the moment of short circuit
Start separating brake, but due to exchanging SF6(sulfur hexafluoride) breaker could when generally waiting the cycle zero crossing of AC sine wave
Arc extinguishing, electric arc could be extinguished by generally requiring 10~20ms times, therefore be the C-D in Fig. 5 in this blow-out time of 20ms
" 3 " number line, this curve are U after short circuit interruption1The voltage situation that directly steep formula rises, because main circuit breaker DL-1 cut-offs
Afterwards so that principal reactance device B secondary side windings N2Open circuit, such principal reactance device B are equal to influence without back-emf, caused once
Side (armature winding N1) voltage of peak, this situation either unloaded equivalent to Circuit Fault on Secondary Transformer open circuit is presented.Due to
Huge short circuit current effect, U1Voltage can reach 3~4 times of secondary side open-circuit voltage under usually load current, you can reach
About 240~350KV, and using this magnitude of voltage just come limiting short-circuit current, contribution rate of the value about up to 25~45%, because
This this programme progressively improves to one-level level the U in the Ith loop1Value, is stepped up comprehensive impedance value, to reach limiting short-circuit current
The value of total value about 35%~50%, it can be ensured that the Power Control of trouble point short circuit is being met into the rupturing capacity of breaker
Within scope.
According to above-mentioned current limliting principle, it is further illustrated with below by specific embodiment.
Embodiment one, as shown in Fig. 1, Fig. 3~6, the device of this volitional check short-circuit current is applied to rated voltage
Grade is in 500KV AC network, is connected to feeder breaker DL, feeder current transformer CT-1 on power transmission feeder line successively, enters
Line side disconnecting switch GL and outgoing line side disconnecting switch GL, the present apparatus (variable reactance current limiter) be serially connected with two disconnecting switch GL it
Between, the variable reactance current limiter is included by iron-core workpiece, armature winding N1With secondary windings N2Principal reactance device B, the air gap electricity of composition
(this example uses high resistant by anti-device DK, main circuit breaker DL-1 (this example uses SF 6 high-voltage circuit breaker) and high anti-reactor GDK
The anti-reactor with air gap, its reactance resistance are 10~20 times of air gap reactor DK higher limits).Wherein, armature winding N1String
It is connected among feeder line, is the Ith loop；Secondary windings N2The IIth loop is formed with air gap reactor DK and main circuit breaker DL-1；And
It is coupled to secondary windings N2The high anti-reactor GDK at both ends forms the IIIth loop；Meanwhile by feeder current transformer CT-1, secondary
Winding N2Side Current Transmit -2 and the relay protection control system being installed in electric substation form detection control loop.
This example is in the IIth loop, main circuit breaker DL-1 and secondary windings N2Standby disjunction is also sealed between end (a2)
Component, the standby disjunction component includes back-up breaker DL-2 in parallel and fastp-acting fuse RD, and (this example is quick using detonator formula
Fuse, actuation time are 1~5ms).Meanwhile in armature winding N1Loaded tap-off is sealed between outgoing line side disconnecting switch GL
Switch FK.
The air gap reactor DK includes being wound with coil 1-3 secured core 1-2, and the secured core is in three-back-shaped, and two
Parallel sliding shackle 1-6 (inner side for being fixed on secured core) is provided between vertical side arm, on a side arm of secured core
By rotating shaft 1-5 pin joint movable core 1-1, the end face of another side arm of movable end face of movable core and between normality holding
Gap δ, spring 1-4 is provided between movable core 1-1 and sliding shackle 1-6.Rubber cushion blocks are also equipped with sliding shackle 1-6
1-7, it is therefore an objective to alleviate dynamic and static iron core enormous impact force as caused by electromagnetic attraction under short circuit current effect, rubber cushion blocks
Material may be selected weather-proof tire hard rubber and make.
During normal operation, feeder breaker DL, enter line side disconnecting switch GL and outgoing line side disconnecting switch GL are in closing a floodgate
Position.Assuming that the rated current Ie=2000A of circuit, principal reactance device B primary (once), secondary (secondary) Winding Design no-load voltage ratio are
N1：N2=1：2, from transformer principle：N1：N2=U1：U2=I2：I1=1：2, i.e. first winding flows through electric current Ie=2000A
When, secondary winding electric current Ie2=1000A.Air gap reactor DK is run, and main circuit breaker DL-1, back-up breaker DL-2 are in
Closing position, the impedance very little presented by requiring air gap reactor DK when normal so that principal reactance device B secondary winding
N2Almost run in short-circuit condition, in this example, rated voltage 500KV, the induced voltage U of primary side0=3.25KV, is accounted for
6.5/1000ths of rated voltage 500KV, power consumer can be with normal operations.
The principal reactance device B, its structure are doublewound single-phase or three-phase transformer body, and one on load voltage of configuration
Shunting switch FK, the V-type of MR companies of shunting switch model Britain, or the ZY1A (m) of the factory of Long March electrical appliance one production, due to this
The first winding of transformer is that direct connect accesses the main current supply circuit of 500KV voltage class, i.e. among the Ith loop, therefore will
Ask coil can be outside the insulating capacity with relevant voltage grade, it is to have electrodynamic water when resisting huge short-circuit also to require coil
Flat, because under the big short circuit current effects of 60kA, winding inter-turn easily deforms, it is therefore desirable to transformer once, two
Secondary winding carries out installing fixing device additional with insulating materials, or using the integrated poured method of epoxy composite material, to ensure
The ability that electric power is impacted during the resistance to shorting of coil.The iron core of the principal reactance device B is the good (relative permeability of magnetic property
μr>1000) silicon steel sheet closed assembly forms, and the coil of reactance transformer uses copper conductor, copper aluminum alloy wire or aluminum conductor coiling.Such as
Insulating requirements that fruit is pressure-resistant are armature winding 500KV/ secondary windings 500KV, 300000KVA, armature winding N1Coil working voltage
75KV, the model that Baoding martial prowess transformer factory can be selected to produce：SFP-300000/500 transformers, or there is large-scale electricity
The producer of furnace transformer knowhow.
The air gap reactor DK of this example, again must be because in the high-voltage fence applied to 500KV, dash current value is big
First cycle of AC sine wave is by the primary side U of transformer in 10ms after short circuit1Quickly it is lifted to a larger quantities
Value, this just needs air gap reactor DK to have the mutation of an impedance value to increase in moment, the spring air gap type that this example uses
Reactor, it is possible to meet this requirement, as shown in figure 4, during air gap reactor normal work, because spring 1-4 pulling force is big
In made due to electromagnetic attraction caused by load current movable core 1-1, secured core 1-2 be in air gap delta=3cm~
(due to the presence in gap, relative permeability μ r reduce the distance of 10cm or so spaced positions, U3Diminish), and work as short circuit current
When flowing through air gap reactor DK coils, electric current increase, moment, which produces powerful electromagnetic attraction, makes dynamic and static iron core overcome spring force
And close, total magnetic permeability mu r will increase by tens times to more than 100 times after iron core closure, make U3It increased dramatically.
Generally up to several tons or tens tons of electromagnetic attraction can make movable core 1-1 produce the first of about 8~10m/ seconds
Speed, this speed are enough to make iron core move 3~5 centimetres in 5ms, just meet requirement the first of alternating current sine wave
The requirement of reactor is sealed within the upper half-wave 10ms of individual cycle.
In this example main circuit breaker DL-1 play effect be in 10~20ms or so, while short trouble occurs, by
Fault message is sent to main circuit breaker DL-1 by detection control loop, makes the circuit breaker trip, from the foregoing it will be appreciated that the main open circuit
Device DL-1 quenching time stills need 10~20ms.If selecting voltage class to choose 500KV, rated current 2500A, cut-off
Electric current 63KV, main circuit breaker DL-1 consult the 500KV/2500A of optional Xi'an High-tension Switch Factory after product manual, model
LW12- 500 sulfur hexafluoride breaker.Main circuit breaker DL-1 can also select oil-break or vacuum circuit breaker.
In addition to main circuit breaker DL-1, this example is provided with back-up breaker DL-2, and it is when short trouble is sent out that it, which is acted on,
If detection control loop can not disconnect main circuit breaker DL-1 when raw, to ensure the high reliability of device, in the IIth loop
Secondary windings N is mounted with again2Side Current Transmit -2, as long as there is the short circuit of sensing in principal reactance device B secondary side windings
Electric current, then continue to send trip command to back-up breaker DL-2, disconnect back-up breaker DL-2, so that it is guaranteed that principal reactance
Device B secondary coils cut-off when short trouble occurs.In view of the otherness of product, back-up breaker DL-2 should select difference
The different model of producer, and the control signal of two circuit breaker trips should also be taken respectively from different transformers, actually use
During it could also be possible that two breakers trip simultaneously, this is also exactly result of the presently claimed invention.
In the measure for preventing main circuit breaker DL-1, back-up breaker DL-2 from malfunctioning, the present embodiment additionally uses height
Pressure limiting devices of the anti-reactor GDK as the IIIth loop, if main circuit breaker DL-1 or back-up breaker DL-2 malfunctions for some reason
Trip and (short trouble does not occur now), if now load current is very big, such as more than 2600A, it is possible to U can be made1By
3.25KV substantially exceeds 50KV voltage level, so as to influence the power supply of user, to ensure power supply user's terminal voltage ± 10%
Interior fluctuation, the sizes of the high anti-reactor GDK resistances on the IIIth loop with run under a load rated current Ie when, it is main disconnected
During the device DL-1 malfunctions of road, it is ensured that U1Ue of the value no more than 10% is defined.Empirical data X is taken in this exampleGDK=15 × XDK, wherein：
XGDKFor high anti-reactor GDK reactance value, XDKFor air gap reactor DK reactance value.
After short trouble disappears, short circuit current disappears immediately, primary of the only normal rated current Ie from transformer
Winding N1Flow through, now detect control loop and do not export trip signal, by manual control or reclosing device by main circuit breaker
DL-1, back-up breaker DL-2 close a floodgate respectively, and device is in normal operating condition again.
It was found from foregoing description, this current-limiting apparatus is substantially a booster, because the essence of short trouble is voltage
Moment fall and caused by huge short circuit current, and energy is conservation in power network, and it is unable to pop-off, can only be by one kind
State Transferring is another state, and voltage falls reduction suddenly, and power is constant, P=IU, and to maintain P constant, electric current can only be fast
Speed increase, to return to original state, must just re-establish starting voltage, could reduce short circuit current, therefore, this current limliting
Device is substantially voltage recovery device.
Embodiment two, as shown in Fig. 2, Fig. 3~6, the basic structure of the present embodiment is identical with example one, the difference is that only
Back-up breaker DL-2 is substituted with fastp-acting fuse RD；Short circuit guarantor of the present apparatus applied to 600,000 kilowatts of Generator Set
Shield.
Claims (9)
1. the device of volitional check short-circuit current in a kind of AC network, there is 20~500KV ac bus, power transmission feedback
Feeder breaker (DL), feeder current transformer (CT-1) and two disconnecting switch (GL), its feature are connected on line successively to exist
In：Seal in a variable reactance current limiter between two disconnecting switch (GL) of feeder line, the variable reactance current limiter include by
Iron-core workpiece, armature winding (N1) and secondary windings (N2) composition principal reactance device (B), air gap reactor (DK), main circuit breaker
(DL-1) and high anti-reactor (GDK), wherein, armature winding (N1) be serially connected among feeder line, it is the Ith loop；Secondary windings
(N2) and the IIth loop of air gap reactor (DK) and main circuit breaker (DL-1) composition；It is parallel to secondary windings (N2) height at both ends resists
Reactor (GDK) forms the IIIth loop；Meanwhile by feeder current transformer (CT-1), secondary windings (N2) side current transformer
(CT-2) and the relay protection control system that is installed in electric substation forms detection control loop.
2. the device of volitional check short-circuit current in AC network according to claim 1, it is characterised in that：
In II loop, main circuit breaker (DL-1) and secondary windings (N2) back-up breaker (DL-2) is also sealed between end.
3. the device of volitional check short-circuit current in AC network according to claim 1, it is characterised in that：
In II loop, main circuit breaker (DL-1) and secondary windings (N2) fastp-acting fuse (RD) is also sealed between end.
4. the device of volitional check short-circuit current, its feature exist in the AC network according to claim 1 or 2 or 3
In：Armature winding (the N1) load ratio bridging switch (FK) is sealed between outgoing line side disconnecting switch (GL).
5. the device of volitional check short-circuit current in AC network according to claim 4, it is characterised in that：It is described
Air gap reactor (DK) includes the secured core (1-2) for being wound with coil (1-3), and the secured core is in three-back-shaped, two vertical sides
Parallel sliding shackle (1-6) is provided between arm, passes through rotating shaft (1-5) pin joint movable core on a side arm of secured core
(1-1), the end face of another side arm of movable end face of movable core simultaneously normality keep gap delta, movable core (1-1) with
Spring (1-4) is provided between sliding shackle (1-6), rubber cushion blocks (1-7) are also equipped with sliding shackle (1-6).
6. the device of volitional check short-circuit current in AC network according to claim 5, it is characterised in that：It is described
Gap delta is controlled in 30~100mm.
7. the device of volitional check short-circuit current in AC network according to claim 1, it is characterised in that：It is described
Main circuit breaker (DL-1) is SF 6 high-voltage circuit breaker, oil-break or vacuum circuit breaker.
8. the device of volitional check short-circuit current in AC network according to claim 3, it is characterised in that：It is described
Fastp-acting fuse (RD) is detonator formula fastp-acting fuse, and actuation time is 1~5ms.
9. the device of volitional check short-circuit current in AC network according to claim 1, it is characterised in that：It is described
High anti-reactor (GDK) be reactor of the high impedance with air gap, its reactance resistance be air gap reactor (DK) higher limit 10~
20 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511035150.7A CN105449653B (en) | 2015-12-24 | 2015-12-24 | The device of volitional check short-circuit current in a kind of AC network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511035150.7A CN105449653B (en) | 2015-12-24 | 2015-12-24 | The device of volitional check short-circuit current in a kind of AC network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105449653A CN105449653A (en) | 2016-03-30 |
| CN105449653B true CN105449653B (en) | 2018-01-09 |
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| CN107887889A (en) * | 2017-09-25 | 2018-04-06 | 张京伦 | For quickly changing the transient reactance device of AC network middle impedance value |
| CN107565522A (en) * | 2017-10-09 | 2018-01-09 | 张京伦 | A kind of combined DC release unit |
| CN117368799B (en) * | 2023-12-07 | 2024-02-23 | 山西思极科技有限公司 | Diagnosis method for short-circuit fault of power transmission line of power system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751710A (en) * | 2012-07-30 | 2012-10-24 | 浙江大学 | Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter |
| CN103683307A (en) * | 2012-09-21 | 2014-03-26 | 哈尔滨帕特尔科技股份有限公司 | New type series compensated line subsynchronous resonance damping and short-circuit current limiting device |
| CN104953570A (en) * | 2015-04-27 | 2015-09-30 | 深圳市今朝时代新能源技术有限公司 | Fault current limiter |
| CN205335830U (en) * | 2015-12-24 | 2016-06-22 | 章则明 | Device of volitional check short -circuit fault electric current among AC electric network |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751710A (en) * | 2012-07-30 | 2012-10-24 | 浙江大学 | Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter |
| CN103683307A (en) * | 2012-09-21 | 2014-03-26 | 哈尔滨帕特尔科技股份有限公司 | New type series compensated line subsynchronous resonance damping and short-circuit current limiting device |
| CN104953570A (en) * | 2015-04-27 | 2015-09-30 | 深圳市今朝时代新能源技术有限公司 | Fault current limiter |
| CN205335830U (en) * | 2015-12-24 | 2016-06-22 | 章则明 | Device of volitional check short -circuit fault electric current among AC electric network |
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