CN105449653A - Device for automatically restricting short circuit fault current in alternating current power grid - Google Patents

Device for automatically restricting short circuit fault current in alternating current power grid Download PDF

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Publication number
CN105449653A
CN105449653A CN201511035150.7A CN201511035150A CN105449653A CN 105449653 A CN105449653 A CN 105449653A CN 201511035150 A CN201511035150 A CN 201511035150A CN 105449653 A CN105449653 A CN 105449653A
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China
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current
winding
reactor
loop
feeder
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CN201511035150.7A
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CN105449653B (en
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张健
张京伦
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章则明
石明君
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00Fixed transformers not covered by group H01F19/00
    • H01F30/06Fixed transformers not covered by group H01F19/00 characterised by the structure
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/06Emergency 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

Abstract

The invention relates to a device for automatically restricting short circuit fault current in an alternating current power grid. The invention aims to cause the device to be under low-power loss when the device normally operates, can increase the reactance value number of an electric reactor while a circuit is subjected to short circuit, and lightens the damage degree of a short circuit fault. The device is provided with a 20-500KV alternating current bus; a power transmission feeder is successively connected with a feeder circuit breaker, a feeder current mutual inductor and two disconnecting switches; a variable reactance current limiter is connected between the two disconnecting switches of the feeder; the variable reactance current limiter comprises a main electric reactor, an air gap electric reactor, a main circuit breaker and high-resistance reactors, wherein the main electric reactor consists of an iron core body, a primary winding and a secondary winding; the primary winding is connected in the feeder in series and is a first loop; the secondary winding, the air gap electric reactor and the main circuit breaker form a second loop; the high-resistance reactors connected to two ends of the secondary winding in parallel form a third loop; and meanwhile, the feeder current mutual inductor, a secondary winding side current mutual inductor and a relay protection control system installed in a power substation form a detection control loop.

Description

The device of volitional check short-circuit current in a kind of AC network
Technical field
The present invention relates to the device of volitional check short-circuit current in a kind of AC network.Prevent the high voltage electric equipment in electrical network from damaging because of short trouble.
Background technology
At present, along with increasing rapidly of load in the expanding day of China's electrical network scale, electric power system, particularly in the end of the year 2014, the capacity of installed generator of China has reached 12.5 hundred million kilowatts, rank first in the world, so numerous, large sized unit put into operation and the interconnected Power System Shortcuts levels of current that makes of each large regional grid also increases day by day, many areas particularly coastal economy developed regions, as the short circuit current level of the electrical networks such as Shanghai, Jiangsu, Zhejiang, Guangdong, meet or exceed the maximum permissible value that " electric power code " limits.
In 500kv and the 220kv transformer station in the large city of some load densities and area, prospective short circuit current level may more than 100KA.Data shows, the possible maximum short circuit current periodic component of the three gorges hydropower plant can reach 300KA.Current producible switchgear in the world, maximum drop-out current as current 500KV electric pressure is in the world 80KA, if take effective technical measures limiting short-circuit current not in time, electrical network so may be caused in power network development from now on optional without primary cut-out (switch), and this just means uncontrollable management and running of controlling bulk power grid.For this reason, this is a large problem very urgently needing to solve to grid company.And be that the device that restriction short-circuit current value makes is referred to as electric network fault flow restricter, be called for short (FCL).
To the main technique requirements of electric network fault flow restricter (FCL) be:
Show as zero impedance or slight resistance when electrical network normally runs, power consumption, close to zero, is maximumly no more than 0.25 ~ 1% of transmission power, when electrical network is short-circuited fault, presents rapidly high impedance to contain fault current.Require quick action, the reaction time is less than 10ms even shorter (several milliseconds), is namely restricted to below desired value half; There is fast automatic reset function, repeatedly action can be realized; Reliability should higher than equipment such as the circuit breakers run simultaneously, and equipment operation maintenance cost is low.
But in existing current limiting technique, there is following problem:
1, the metering function of blocked impedance and semiconductor element is larger, then the loss ratio when normal work is larger;
2, superconductive current limiter has good current limitation effect, but needs the running environment of ultralow temperature, equipment investment nearly 100,000,000 yuan and operation expense high, engineering is difficult to promote.
3, retrieve through applicant, patent of the same type is as Electric Power Section institute of Ningxia electric power company Authorization Notice No. CN103023000B, program Problems existing is, owing to being by speed-sensitive switch and current limiting reactor parallel running at ordinary times, when short circuit current occurs, protective relaying device needs first by after speed-sensitive switch disconnection, current limiting reactor just can seal in performance metering function, but actual conditions are any speed-sensitive switches is in 0.01 second (10ms) within the time of the upper half-wave of first cycle of alternating current circuit transcient short circuit time, theoretical according to switching arc, the electric arc that cannot eliminate completely in arc control device, and can only after the zero crossing of first cycle, i.e. ability arc extinguishing after 10ms (millisecond), this just means could effectively will devote oneself to work by above-mentioned reactance current limiter after 10ms.Also clearly write exactly in specification [0045] section of this patent " this first intelligent high-speed switch at once disconnects in 15ms, is dropped into by the first flow restricter in current limliting operation ".And in electrical network actual conditions, first cycle (namely in 0 ~ 10ms) after short circuit is the most urgent to limiting short-circuit current value, because be now positioned at the circuit breaker likely action of current limiting reactor lower end, if Deng until 15ms drops into flow restricter more later, the circuit breaker of lower end may because the deficiency of arc control device rupturing capacity, and cannot blow-out, make electric arc be in fired state always, make circuit not cut-off or to cause circuit breaker to blast.
Summary of the invention
The technical problem to be solved in the present invention is: the device providing volitional check short-circuit current in a kind of AC network, this device is low-power consumption (being about 5 ‰ ~ 1%) when normal operation, and the reactance value number of reactor rapidly, significantly, sudden change can be increased when circuit is short-circuited, at least should limit the short circuit current of 20 ~ 50% values, obviously alleviate the extent of damage of short trouble.
The technical solution adopted in the present invention is: the device of volitional check short-circuit current in AC network, there is the ac bus of 20 ~ 500KV, power transmission feeder line is connected to successively feeder breaker, feeder current instrument transformer and two isolating switches, it is characterized in that sealing in a variable reactance flow restricter between two isolating switches of feeder line, this variable reactance flow restricter comprises the principal reactance device, air gap reactor, main circuit breaker and the high resistance reactor that are made up of iron-core workpiece, armature winding and secondary winding, wherein, armature winding is serially connected with among feeder line, is the Ith loop; Secondary winding and air gap reactor and main circuit breaker form the IIth loop; The high resistance reactor being parallel to secondary winding two ends forms the IIIth loop; Meanwhile, detection control loop is formed by feeder current instrument transformer, secondary winding side current transformer and the relay protection control system be installed in electric substation.
A kind of scheme, in the IIth loop, seals in disjunction assembly for subsequent use between main circuit breaker and secondary winding end, this disjunction assembly for subsequent use comprises back-up breaker in parallel and fast acting fuse.
Another kind of scheme, in the IIth loop, only seals in fast acting fuse between main circuit breaker and secondary winding end.
On load tap changer is sealed between described armature winding and outgoing line side isolating switch.
Described air gap reactor comprises the secured core being wound with coil, this secured core is three-back-shaped, parallel sliding shackle is provided with between two vertical side arms, a side arm of secured core connects movable core by roller pin, the activity of movable core is rectified the end face of another side arm and is kept gap delta in normality, between movable core and sliding shackle, be provided with spring, sliding shackle is also equipped with rubber cushion blocks.Described gap delta controls at 30 ~ 100mm.
Described main circuit breaker is SF 6 high-voltage circuit breaker, oil circuit breaker or vacuum circuit-breaker.
Described fast acting fuse is detonator formula fast acting fuse, and operate time is 1 ~ 5ms.
Described high resistance reactor is the reactor of high impedance band air gap, and its reactance resistance is 10 ~ 20 times of air gap reactor higher limit.
The invention has the beneficial effects as follows: this device raises bus voltage value automatically by the energy taking from electric network fault short circuit current, again set up normality voltage in the loop, thus in short circuit current scope system automatically being returned to can bear.This device is worked in coordination with the very first time that now gradational circuit breaker occurs at short trouble and is contained short circuit current timely and effectively, ensures the security of operation of network system.
Accompanying drawing explanation
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 in the present invention after the voltage short circuit of principal reactance device armature winding side.
Fig. 6 is alternating current sine wave change curve in time.
Embodiment
As shown in Figure 6, a key issue that will solve due to the present invention is in the upper half-wave i.e. 0 ~ 10ms (namely 0.01 second) of first cycle in the AC system sine wave after short trouble occurs, this flow restricter to be sealed among the Ith loop, and by short circuit current restriction 30 ~ 45% in 20ms.Realize this purpose three current limliting processes as follows:
1, in 0 ~ 5ms time period:
In the design, principal reactance device B is equivalent to a doublewound transformer, its first side winding (armature winding N 1) when flowing through rated current Ie, at secondary side winding (secondary winding N 2) be in short-circuit condition.If now rated current reaches 2000A, the magnetic potential disequilibrium due to transformer first and second winding will produce the magnitude of voltage of about 0.5 ~ 1%Ue (rated voltage) on a winding, and in this programme, this inductive voltage value gets U 0=6.5 ‰ Ue=0.0065 × 500KV=3.25KV.When there being short circuit current to pass through, this induced voltage linearly can increase with the multiple of the ratio of rated current along with short circuit current, if now, short circuit current is 50KA (namely 50000 amperes), it is namely 25 times of rated current 2KA, thus now at armature winding N 1the voltage produced is U 1=3.25KV × 25=81.25KV, namely within 0 ~ 5ms time, by principal reactance device B, the current limliting transient voltage produced by magnetic potential imbalance is up to 81.25KV, due to the generation of this magnitude of voltage, the contribution rate of 5 ~ 10% can be accounted for, as in the 0-A in Fig. 5, the oblique line of " 1 " is U in transcient short circuit time 0 ~ 5ms to the effect of current limliting 1change curve.Therefore the difference induced potential U that the current limliting produced in 0 ~ 5ms contributes mainly principal reactance device B to cause because of magnetic potential imbalance 1and produce.
2, short trouble occurs in rear 5 ~ 10ms time period:
As shown in Figure 4, when short-circuit current flows through the time more than about 5ms, secondary side (the secondary winding N of principal reactance device B 2) electric current makes the movable core 1-1 of air gap reactor DK and secured core 1-2 close, air gap delta is disappeared, and according to reactor principle, reactor reactance value is: X m = 8 π 2 fW 2 μ r A δ N δ × 10 - 7 Ω ,
Wherein: in formula: f is frequency, f=50Hz; W is the number of turn of reactor winding; μ r is iron core relative permeability, gets 300 ~ 1000 for silicon steel sheet; Az is that m is amassed in core of reactor post net section 2; Kdp is core lamination stack coefficient; N is the quantity of reactor air gap; δ is gas length between iron core cake of electric reactor (unit m).
After air gap delta disappears, total magnetic permeability mu r also sharply increases, and makes the voltage U flowing through air gap reactor DK 3also sharply increase, now secondary circuit short-circuit electric current I 3still flow through air gap reactor DK, cause U 3the value of value increases by 20 ~ 60 times, and this value has raised principal reactance device B secondary side (secondary winding N greatly 2) voltage U 2value, and U 2raising, finally make U in the Ith loop 1magnitude of voltage brings up to the level of about 155-200KV by 81.25KV, and reflection A-B section " 2 " number line is in Figure 5 voltage U 1the curve that straight steep formula sudden change increases, due to U 1raising make the impedance of principal reactance device B turn increase about 10 ~ 20%, namely in 5 ~ 10ms, serve obvious metering function.
3, short trouble occurs in rear 10 ~ 20ms time period:
As shown in Figure 1 and Figure 5, through 0 ~ 5ms ~ after the 10ms time, respectively by after principal reactance device B and air gap reactor DK action, U 1voltage (for 500KV system flow restricter), by initial U 0=3.25kv has risen to about 155kv.Larger induction short circuit current is now still had to flow through secondary winding N 2, in fact main circuit breaker DL-1 just started to start separating brake in the moment of short circuit, but owing to exchanging SF 6could arc extinguishing when (sulphur hexafluoride) circuit breaker will wait the cycle zero crossing of AC sine wave usually, general needs 10 ~ 20ms time could extinguish arcs, therefore, when this blow-out time of 20ms, be C-D " 3 " number line in Fig. 5, this curve is U after short circuit interruption 1the situation that the straight steep formula of voltage rises, this is because main circuit breaker DL-1 makes principal reactance device B secondary side winding N after cut-offfing 2open circuit, such principal reactance device B has just been equal to nothing back-emf impact, causes primary side (armature winding N 1) presenting the voltage of peak, this is equivalent to the situation of Circuit Fault on Secondary Transformer open circuit or zero load.Due to huge short circuit current effect, U 1voltage can reach 3 ~ 4 times of secondary side open circuit voltage under load current at ordinary times, about 240 ~ 350KV can be reached, and utilizing this magnitude of voltage just in time to carry out limiting short-circuit current, the contribution rate of value Yue Keda 25 ~ 45%, therefore this programme progressively improves the U in the Ith loop in one-level level ground 1value, makes comprehensive impedance value progressively increase, reaches the value of limiting short-circuit current total value about 35% ~ 50%, the power of fault point short circuit can be guaranteed to control within the scope of the rupturing capacity meeting circuit breaker.
According to above-mentioned current limliting principle, further illustrated below by specific embodiment.
Embodiment one, as shown in Fig. 1, Fig. 3 ~ 6, the application of installation of this volitional check short-circuit current is in the AC network of 500KV in grade of rated voltage, power transmission feeder line is connected to successively feeder breaker DL, feeder current instrument transformer CT-1, inlet wire side isolating switch GL and outgoing line side isolating switch GL, this device (variable reactance flow restricter) is serially connected with between two isolating switch GL, and described variable reactance flow restricter comprises by iron-core workpiece, armature winding N 1with secondary winding N 2the principal reactance device B formed, air gap reactor DK, main circuit breaker DL-1 (this example adopts SF 6 high-voltage circuit breaker) and high resistance reactor GDK (this example adopts the reactor of high impedance band air gap, and its reactance resistance is 10 ~ 20 times of air gap reactor DK higher limit).Wherein, armature winding N 1being serially connected with among feeder line, is the Ith loop; Secondary winding N 2the IIth loop is formed with air gap reactor DK and main circuit breaker DL-1; Be parallel to secondary winding N 2the high resistance reactor GDK at two ends forms the IIIth loop; Meanwhile, by feeder current instrument transformer CT-1, secondary winding N 2side Current Transmit-2 and the relay protection control system be installed in electric substation form detection control loop.
This example in the IIth loop, main circuit breaker DL-1 and secondary winding N 2also seal in disjunction assembly for subsequent use between end (a2), this disjunction assembly for subsequent use comprises back-up breaker DL-2 in parallel and fast acting fuse RD (this example adopts detonator formula fast acting fuse, and operate time is 1 ~ 5ms).Meanwhile, at armature winding N 1and seal on load tap changer FK between outgoing line side isolating switch GL.
Described air gap reactor DK comprises the secured core 1-2 being wound with coil 1-3, this secured core is three-back-shaped, parallel sliding shackle 1-6 (being fixed on the inner side of secured core) is provided with between two vertical side arms, by rotating shaft 1-5 pin joint movable core 1-1 on a side arm of secured core, the activity of movable core is rectified the end face of another side arm and is kept gap delta in normality, is provided with spring 1-4 between movable core 1-1 and sliding shackle 1-6.Sliding shackle 1-6 is also equipped with rubber cushion blocks 1-7, and object is the enormous impact power that the dynamic and static iron core of alleviation is produced by electromagnetic attraction under short circuit current effect, and the material of rubber cushion blocks can select weather-proof tire hard rubber to make.
During normal operation, feeder breaker DL, inlet wire side isolating switch GL and outgoing line side isolating switch GL are all in closing position.Suppose the rated current Ie=2000A of circuit, principal reactance device B elementary (once), secondary (secondary) Winding Design no-load voltage ratio are N 1: N 2=1:2, from transformer principle: N 1: N 2=U 1: U 2=I 2: I 1=1:2, namely a winding flows through electric current I eduring=2000A, secondary winding electric current I e2=1000A.Air gap reactor DK runs, and main circuit breaker DL-1, back-up breaker DL-2 are all in closing position, owing to requiring the impedance that air gap reactor DK presents when normal very little, makes the secondary winding N of principal reactance device B 2be close to and run in short-circuit condition, in this example, rated voltage is 500KV, the induced voltage U of primary side 0=3.25KV, accounts for 6.5/1000ths of rated voltage 500KV, and power consumer can normally run.
Described principal reactance device B, its structure is doublewound single-phase or three-phase transformer body, and configure the shunting switch FK of an on load voltage, shunting switch model is the V-type of MR company of Britain, or the ZY1A (m) that Long March electrical appliance one factory produces, a winding due to this transformer is the main current supply circuit of directly series connection access 500KV electric pressure, namely among the Ith loop, therefore require that coil can with outside the insulating capacity of relevant voltage grade, also require that coil has electrodynamic level when resisting huge short circuit, because under the large short circuit current effect of 60kA, winding inter-turn very easily deforms, therefore need to transformer once, secondary winding carries out installing fixture additional with insulating material, or the method using epoxy composite material integrated poured, the ability that during to guarantee the Short Circuit withstand of coil, electric power is impacted.The iron core of described principal reactance device B is that (relative permeability μ r>1000) silicon steel sheet closed assembly that magnetic property is good forms, and the coil of reactance transformer adopts copper conductor, copper aluminum alloy wire or aluminum conductor coiling.If withstand voltage insulating requirements is armature winding 500KV/ secondary winding 500KV, 300000KVA, armature winding N 1coil working voltage 75KV, can select the model that Baoding martial prowess transformer factory produces: SFP-300000/500 transformer, or the producer with Large Electric Furnace transformer production experience.
The air gap reactor DK of this example is owing to being applied in the high-voltage fence of 500KV, and impulse current value is large, again must after short circuit in first cycle of AC sine wave and 10ms by the primary side U of transformer 1be lifted to a larger value fast, this just needs air gap reactor DK the sudden change of a resistance value can be had to increase in moment, the reactor of the spring air gap type that this example adopts, just can meet this requirement, as shown in Figure 4, when air gap reactor normally works, make movable core 1-1 because spring 1-4 pulling force is greater than the electromagnetic attraction because load current produces, secured core 1-2 is in air gap delta=distance of about 3cm ~ 10cm spaced position is (due to the existence in gap, relative permeability μ r reduces, U 3diminish), and when short circuit current flows through air gap reactor DK coil, electric current increases, producing powerful electromagnetic attraction instantaneously makes dynamic and static iron core overcome spring force and close, and after iron core is closed, total magnetic permeability mu r is by increase by tens doubly to more than hundred times, makes U 3sharply increase.
General up to several tons or the electromagnetic attraction of tens tons movable core 1-1 can be made to produce the initial velocity of about 8 ~ 10m/ second, this speed is enough to iron core is moved 3 ~ 5 centimetres in 5ms, just in time meets the requirement requiring to seal in reactor within the upper half-wave 10ms of first cycle of alternating current sine wave.
The effect that in this example, main circuit breaker DL-1 plays is at about 10 ~ 20ms, while short trouble occurs, fault message is sent to main circuit breaker DL-1 by detection control loop, make this circuit breaker trip, from aforementioned, the quenching time of this main circuit breaker DL-1 still needs 10 ~ 20ms.If select electric pressure to choose 500KV, rated current 2500A, drop-out current 63KV, can select the 500KV/2500A of Xi'an High-tension Switch Factory after this main circuit breaker DL-1 consults product manual, model is LW 12the sulfur hexafluoride breaker of-500.This main circuit breaker DL-1 can also select oil circuit breaker or vacuum circuit-breaker.
Except main circuit breaker DL-1, this example is also configured with back-up breaker DL-2, if its effect is that main circuit breaker DL-1 cannot disconnect by detection control loop when short trouble occurs, is the high reliability of assurance device, in the IIth loop, secondary winding N has been installed again 2side Current Transmit-2, as long as namely there is the short circuit current of induction in principal reactance device B secondary side winding, then continue to send trip command to back-up breaker DL-2, back-up breaker DL-2 is disconnected, thus guarantee that principal reactance device B secondary coil cut-offs when short trouble occurs.Consider the otherness of product, back-up breaker DL-2 should select the different model of different manufacturers, and the control signal of two circuit breaker trips also should take from different instrument transformers respectively, also be likely that two circuit breakers trip simultaneously in actual use, this is result of the presently claimed invention just also.
In the measure preventing main circuit breaker DL-1, back-up breaker DL-2 misoperation, the present embodiment additionally uses the pressure limiting device of high resistance reactor GDK as the IIIth loop, if main circuit breaker DL-1 or back-up breaker DL-2 is misoperation tripping operation (be not now short-circuited fault) for some reason, if now load current is very large, as more than 2600A, namely U may be made 1the voltage levvl of 50KV is substantially exceeded by 3.25KV, thus affect the power supply of user, for ensureing that power supply user side voltage fluctuates, when the size of the high resistance reactor GDK resistance on the IIIth loop is with the rated current Ie run under a load in ± 10%, during main circuit breaker DL-1 malfunction, guarantee U 1the Ue that value is not more than 10% is as the criterion.Empirical data X is got in this example gDK=15 × X dK, wherein: X gDKfor the reactance value of high resistance reactor GDK, X dKfor the reactance value of air gap reactor DK.
After short trouble disappears, short circuit current disappears immediately, only has normal rated current Ie from the armature winding N of transformer 1flow through, now detection control loop does not export trip signal, and main circuit breaker DL-1, back-up breaker DL-2 are closed a floodgate respectively by Artificial Control or reclosing device, device is in normal operating condition again.
From foregoing description, this current-limiting apparatus essence is a stepup transformer, the huge short circuit current caused because the moment that the essence of short trouble is voltage falls, and energy is conservation in electrical network, it can not pop-off, can only be another kind of state by a kind of State Transferring, voltage falls minimizing suddenly, and power is constant, P=IU, constant to maintain P, electric current can only increase rapidly, to return to original state, just starting voltage must be re-established, could reduce short circuit current, therefore, this current-limiting apparatus essence is voltage resume device.
Embodiment two, as shown in Fig. 2, Fig. 3 ~ 6, the basic structure of the present embodiment is identical with example one, and difference is only to substitute back-up breaker DL-2 with fast acting fuse RD; This application of installation is in the short-circuit protection of the Generator Set of 600,000 kilowatts.

Claims (9)

1. the device of volitional check short-circuit current in an AC network, there is the ac bus of 20 ~ 500KV, power transmission feeder line is connected to successively feeder breaker (DL), feeder current instrument transformer (CT-1) and two isolating switches (GL), it is characterized in that: between two isolating switches (GL) of feeder line, seal in a variable reactance flow restricter, this variable reactance flow restricter comprises by iron-core workpiece, armature winding (N 1) and secondary winding (N 2) the principal reactance device (B), air gap reactor (DK), main circuit breaker (DL-1) and the high resistance reactor (GDK) that form, wherein, armature winding (N 1) be serially connected with among feeder line, be the Ith loop; Secondary winding (N 2) form the IIth loop with air gap reactor (DK) and main circuit breaker (DL-1); Be parallel to secondary winding (N 2) the high resistance reactor (GDK) at two ends forms the IIIth loop; Meanwhile, by feeder current instrument transformer (CT-1), secondary winding (N 2) side current transformer (CT-2) and be installed on relay protection control system in electric substation and form detection control loop.
2. the device of volitional check short-circuit current in AC network according to claim 1, is characterized in that: in the IIth loop, main circuit breaker (DL-1) and secondary winding (N 2) also seal in back-up breaker (DL-2) between end.
3. the device of volitional check short-circuit current in AC network according to claim 1, is characterized in that: in the IIth loop, main circuit breaker (DL-1) and secondary winding (N 2) also seal in fast acting fuse (RD) between end.
4. the device of volitional check short-circuit current in the AC network according to claim 1 or 2 or 3, is characterized in that: described armature winding (N 1) and outgoing line side isolating switch (GL) between seal on load tap changer (FK).
5. the device of volitional check short-circuit current in AC network according to claim 4, it is characterized in that: described air gap reactor (DK) comprises the secured core (1-2) being wound with coil (1-3), this secured core is three-back-shaped, parallel sliding shackle (1-6) is provided with between two vertical side arms, by rotating shaft (1-5) pin joint movable core (1-1) on a side arm of secured core, the activity of movable core is rectified the end face of another side arm and is kept gap delta in normality, spring (1-4) is provided with between movable core (1-1) and sliding shackle (1-6), rubber cushion blocks (1-7) sliding shackle (1-6) is also equipped with.
6. the device of volitional check short-circuit current in AC network according to claim 5, is characterized in that: described gap delta controls at 30 ~ 100mm.
7. the device of volitional check short-circuit current in AC network according to claim 1, is characterized in that: described main circuit breaker (DL-1) is SF 6 high-voltage circuit breaker, oil circuit breaker or vacuum circuit-breaker.
8. the device of volitional check short-circuit current in AC network according to claim 3, is characterized in that: described fast acting fuse (RD) for detonator formula fast acting fuse, operate time be 1 ~ 5ms.
9. the device of volitional check short-circuit current in AC network according to claim 1, it is characterized in that: the reactor that described high resistance reactor (GDK) is high impedance band air gap, its reactance resistance is 10 ~ 20 times of air gap reactor (DK) higher limit.
CN201511035150.7A 2015-12-24 2015-12-24 The device of volitional check short-circuit current in a kind of AC network CN105449653B (en)

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* Cited by examiner, † Cited by third party
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CN105845402A (en) * 2016-06-12 2016-08-10 国家电网公司 Variable-impedance transformer
CN107565522A (en) * 2017-10-09 2018-01-09 张京伦 A kind of combined DC release unit

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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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