CN207518280U - The three-phase imbalance for having both fault current limitation function administers device - Google Patents
The three-phase imbalance for having both fault current limitation function administers device Download PDFInfo
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- CN207518280U CN207518280U CN201720715139.3U CN201720715139U CN207518280U CN 207518280 U CN207518280 U CN 207518280U CN 201720715139 U CN201720715139 U CN 201720715139U CN 207518280 U CN207518280 U CN 207518280U
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- 238000004804 winding Methods 0.000 claims abstract description 35
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- 238000010168 coupling process Methods 0.000 description 11
- 238000005859 coupling reaction Methods 0.000 description 11
- 230000005611 electricity Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000006872 improvement Effects 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
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- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The utility model proposes a kind of three-phase imbalances for having both fault current limitation function to administer device, including：Transformer core, three groups of AC coupled coils and the one group of ancillary coil of annular；Three groups of AC coupled coils and ancillary coil are with identical around on the transformer core；In three groups of AC coupled coils, in a phase line of any one group of AC coupled coil series connection access three phase network, and in the different phase lines of arbitrary two groups of AC coupled coils access three phase network；Voltage source converter or anti-parallel thyristor of the auxiliary winding both ends parallel connection based on IGBT, the no-load voltage ratio of three groups of AC coupled coils is 1: 1: 1, and the no-load voltage ratio of the ancillary coil and any one group of AC coupled coil is 1: k.The utility model can be administered effectively, while have both fault current limitation function for fault and normality is uneven, not influence the operating condition and security and stability of power grid again when power grid is without uneven and short trouble.
Description
Technical field
The utility model is related to electrical technology field, especially a kind of three-phase imbalance for having both fault current limitation function
Device is administered, fault/stability uneven and short trouble can be directed to and administered.
Background technology
Three-phase Power Systems imbalance can be divided into fault two kinds of uneven and normality imbalance, and fault imbalance refers to
The uneven operating mode that power grid occurs when various asymmetric earth faults occur, such as singlephase earth fault, two-phase phase-to phase fault；
Normality imbalance refers to the uneven operating mode that power grid occurs in steady-state operation.
Fault imbalance usually requires to carry out error protection, under the background of power grid scale development, grid short circuit electric current
Level is continuously improved, and the difficulty of error protection is continuously improved, there is an urgent need to one kind can effectively fault restriction transient state it is unbalanced
Administering method.Normality imbalance by hair, it is defeated, become, match, caused with the off-center operation of five links, usual generator and change
The symmetry of depressor is preferable, and imbalance is mainly caused by the asymmetry of transmission line of electricity and power load.
It is current uneven administer device load mainly carried out by change-over switch readjust distribution, can not rapid pin to normal
Property imbalance carry out corresponding, it is even more impossible to successfully manage fault uneven and earth fault to be administered.Therefore, compel to be essential at present
The uneven uneven abatement equipment administered of fault and normality can be suitable for by wanting a kind of, while can be directed to various temporary
State failure carries out fast failure current limit.
Invention content
Goal of the invention：For solve it is existing it is uneven administer device can not rapid pin normality imbalance is carried out it is corresponding, there are no
Method successfully manages the technical issues of fault uneven and earth fault is administered, and the utility model proposes one kind to have both failure
The three-phase imbalance of current limit function administers device, which administers device can be
It is effectively administered, while do not influence power grid for fault and normality is uneven when power grid is without uneven and short trouble
Operating condition and security and stability.
Technical solution：To realize above-mentioned technique effect, the utility model proposes following technical schemes：
The three-phase imbalance for having both fault current limitation function administers device, including：The transformer core of annular, three groups of exchanges
Coupling coil and one group of ancillary coil；Three groups of AC coupled coils and ancillary coil are with identical around to wound on described
On transformer core；In three groups of AC coupled coils, the one of any one group of AC coupled coil series connection access three phase network
In phase line, and in the different phase lines of arbitrary two groups of AC coupled coils access three phase network；The auxiliary winding both ends are simultaneously
Symbasis is in the voltage source converter or anti-parallel thyristor of IGBT；The no-load voltage ratio of three groups of AC coupled coils is 1: 1: 1, and institute
The no-load voltage ratio for stating ancillary coil and any one group of AC coupled coil is 1: k.
Further, three groups of AC coupled coils and ancillary coil both ends difference shunt trip breaker, it is described disconnected
Road device is in when three-phase imbalance improvement device is normal cut-offs state, when faults itself and small current grounding fault occurs in equipment
It is closed.
Advantageous effect：Compared with prior art, the present invention has the advantage that：
The utility model can (three-phase equilibrium and without short trouble) normal in power grid when, access after power grid to electric network swim
Three-phase equilibrium degree and line current are without influence, when there are during three-phase imbalance operating mode, quickly reducing the imbalance of three-phase current；
It, can quick fault current limiting level when uneven earth fault occurs；When occurring to balance earth fault, event can be also limited
Hinder levels of current.The magnetic circuit restricted type three-phase imbalance that fault current limitation function is had both in the present invention administers the complete machine operation of device
It is lost relatively low, it can be achieved that adaptive during load current imbalance administers response, the quick action that imbalance is administered.Meanwhile
Adaptive throttling response when fault current occurs, the quick action of failure current limit can be achieved.
Description of the drawings
Fig. 1 is the structural principle that the three-phase imbalance described in the utility model for having both fault current limitation function administers device
Figure；
Fig. 2 is that the three-phase imbalance described in the utility model for having both fault current limitation function administers device in three phase network
Access figure；
Fig. 3 is the function wiring diagram of auxiliary winding；Fig. 4 for power grid without uneven and short trouble when of the present invention have both
The three-phase imbalance of fault current limitation function administers the three-phase current comparison diagram before and after device access power grid；
There are the three-phase imbalances of the present invention during normality imbalance for having both fault current limitation function for power grid by Fig. 5
Administer the three-phase current comparison diagram before and after device access power grid；
There are the three-phase imbalances of the present invention during normality imbalance for having both fault current limitation function for power grid by Fig. 6
Administer the three-phase current partial enlarged view before and after device access power grid；
The three-phase imbalance of the present invention for having both fault current limitation function when Fig. 7 is power grid generation singlephase earth fault
Administer the three-phase electricity flow graph before device access power grid；
The three-phase imbalance of the present invention for having both fault current limitation function when Fig. 8 is power grid generation singlephase earth fault
Administer the three-phase electricity flow graph after device access power grid.
Specific embodiment
The utility model is further described below in conjunction with the accompanying drawings.
Fig. 1 show the structure original that the three-phase imbalance described in the utility model for having both fault current limitation function administers device
Reason figure, Fig. 2 show the system that the three-phase imbalance for having both fault current limitation function administers device access three phase network and connect
Enter figure；As shown in the figure, the three-phase imbalance for having both fault current limitation function is administered device and is included：One annular core, iron
Three groups of coupling windings are installed, if this three groups of coupling windings are respectively to couple winding A, coupling winding B and coupling winding C on core.
Couple the A phase lines of winding A access power grids, the B phase lines of coupling winding B access power grids, the C phases of coupling winding C access power grids
Circuit, three groups of coupling windings be also equipped on transformer core, on annular core in the same direction one group of auxiliary around
Group, auxiliary winding around to consistent with three groups of other coupling windings；Voltage of the auxiliary winding both ends parallel connection based on IGBT
Source current transformer or anti-parallel thyristor, connection topology is as shown in figure 3, auxiliary winding is equal when fault and normality is uneven
It in the state that exits, only puts into operation when balance short trouble occurs in power grid, during operation, passes through the voltage source based on IGBT and become
The balance earth fault and compensate low/excessively electric that the electric current that stream device or anti-parallel thyristor are adjusted in auxiliary winding comes in suppression circuit
Pressure：When balanced to ground failure occurs, by controlling the magnetic flux of the current regulation transformer core in auxiliary winding, make transformer
Uneven magnetic flux is generated in iron core, and then generates inductive sensor with fault current limiting；When low-voltage/overvoltage occurs, lead to
The magnetic flux of the current regulation transformer core in auxiliary winding is overregulated, compensation electricity is induced in three groups of AC coupled coils
Pressure, so as to which low-voltage or overvoltage be made to reach normal voltage level.
When controlling auxiliary winding using VSC (voltage source converter based on IGBT), auxiliary winding can pass through three-phase
Winding directly takes electricity, i.e., the DC voltage needed for using three-phase windings progress rectification offer VSC can also utilize external independent electrical
Source provides the DC power supply needed for VSC；When using anti-parallel thyristor formula, auxiliary winding is independent with three-phase windings, does not need to be outer
Portion provides DC power supply.
In above-mentioned technical proposal, the no-load voltage ratio of three groups of coupling windings is 1: 1: 1, it is ensured that the equipment is when Power System Steady-state is run
Equilibrium pressure drop invariably does not destroy the original non-equilibrium state of power grid.And the no-load voltage ratio that auxiliary winding couples winding with any one group is 1
∶k。
Preferably, three groups of coupling windings and one group of auxiliary winding both ends difference by-pass switch in parallel, bypass when equipment is normal
Switch, which is in, cut-offs state.By-pass switch is only closed in equipment faults itself and small current grounding fault, for equipment itself
The normal power supply of non-faulting phase when protection and small current neutral grounding.
The utility model, can be by realizing three-phase symmetrical failure for hree-phase symmetry failure to auxiliary winding flux regulator
Fault current limitation, the operation principle of the utility model is further illustrated below by way of specific embodiment.
When monitoring symmetric fault using unbalance protection/longitudinal difference protection based on traveling wave/small echo fault identification technology, lead to
The electric current of VSC or anti-parallel thyristor adjusting auxiliary winding is crossed to its definite value, makes the fault current water of generation three-phase symmetrical failure
It is flat less than circuit breaker interrupting capacity, breaker can normal disjunction fault current at this time；When low/overvoltage occurs, when detecting
During low/overvoltage, the electric current of auxiliary winding is adjusted by VSC or anti-parallel thyristor makes the output voltage of three-phase windings reach it
Rated value completes the improvement of low/overvoltage.
Three-phase imbalance is taken to administer the main electric parameter of device as 400V/60kVA, no-load current 1%, short-circuit impedance 4% is empty
Load-loss 0.025%, no-load loss 0.014%.Grid side adds 10kV/400V distribution transformers to supply load for 10kV power supplys
Electricity loads the reactance series connection of the resistance and 0.063H for 54 ohm.
In power grid nominal situation, i.e. power grid three-phase equilibrium and without short trouble.Three-phase imbalance administers device access power grid
Preceding and access power grid three-phase current analogous diagram is as shown in figure 4, there is three suite lines in figure：Ia, Ib, Ic, respectively three phase network
A, the electric current in B, C phase line before and after three-phase imbalance improvement device access power grid.Wherein, three solid lines are administered for three-phase imbalance
Three-phase current curve before device access power grid, three dotted lines administer the three-phase current song after device accesses power grid for three-phase imbalance
Line.It can be seen that from analogous diagram, it is constant that the current peak that three-phase imbalance is administered before and after device access power grid is maintained at 6A, to power grid
Trend is without influence.
When normality imbalance operating mode occurs, network load three-phase imbalance is taken as typical scene, setting B phase load resistances
It is anti-that differ the impedance of 10%, A phase loads with C to differ 20% with C phases be typical.Three-phase imbalance is administered before device access power grid and is accessed
Three-phase current analogous diagram after power grid has three suite lines as shown in Figure 5 and Figure 6, in figure：Ia, Ib, Ic, respectively three phase network A,
B, the electric current in C phase lines before and after three-phase imbalance improvement device access power grid.Wherein, three solid lines administer device for three-phase imbalance
The three-phase current after power grid is accessed, three dotted lines administer the three-phase current before device accesses power grid for three-phase imbalance.From analogous diagram
In can be seen that, three-phase imbalance administer device access power grid before three-phase current be：6.79A (A phases), 6.04A (B phases), 5.44A (C
Phase), degree of unbalancedness is：A phases and B phase deviations 12.42%, C phases and B phase deviations 9.93%.Three-phase imbalance administers device access
Three-phase current after power grid is：5.74A (A phases), 6.05A (B phases), 6.42A (C phases), degree of unbalancedness is：A phases and B phase deviations
5.12%th, C phases and B phase deviations 6.11%.After three-phase imbalance administers device access power grid, tri-phase unbalance factor obtains effectively
It reduces.
When fault uneven operating mode occurs, it is typical scene to take power grid that singlephase earth fault occurs, and sets ground connection electricity
0.01 Ω is hindered, earth fault is happened at transformer C phase outgoing line sides, fault time 50ms.Three-phase imbalance administers device access electricity
Three-phase current analogous diagram difference before net and after access power grid is as shown in Figure 7 and Figure 8.In Fig. 7, dotted line is administered for three-phase imbalance
Device accesses the A phase currents of power grid three-phase power grid, and two solid lines are respectively that three-phase imbalance administers device access power grid three-phase electricity
B, C phase current of net.In Fig. 8, three curves are respectively A, B, C phase that three-phase imbalance administers three phase network after device access power grid
Electric current.As can be seen from FIG., when singlephase earth fault occurs, when three-phase imbalance administers device and does not access power grid, C phase faults electricity
Flow horizontal peak value reaches 3.82kA；When three-phase imbalance administers device access power grid, C phase fault electric current horizontal peaks reach
18.2A；After three-phase imbalance administers device access power grid, fault current levels when singlephase earth fault occurs effectively are dropped
It is low.
The above is only the preferred embodiment of the utility model, it should be pointed out that：For the common skill of the art
For art personnel, under the premise of the utility model principle is not departed from, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the utility model.
Claims (2)
1. the three-phase imbalance for having both fault current limitation function administers device, which is characterized in that including：The transformer fe of annular
Core, three groups of AC coupled coils and one group of ancillary coil；Three groups of AC coupled coils and ancillary coil with it is identical around
To on the transformer core；In three groups of AC coupled coils, any one group of AC coupled coil series connection access
In one phase line of three phase network, and in the different phase lines of arbitrary two groups of AC coupled coils access three phase network；It is described auxiliary
Help voltage source converter or anti-parallel thyristor of the parallel connection of winding both ends based on IGBT；The no-load voltage ratio of three groups of AC coupled coils
It is 1: 1: 1, and the no-load voltage ratio of the ancillary coil and any one group of AC coupled coil is 1: k.
2. the three-phase imbalance according to claim 1 for having both fault current limitation function administers device, which is characterized in that institute
Three groups of AC coupled coils and ancillary coil both ends difference shunt trip breaker are stated, the breaker is administered in three-phase imbalance
In state is cut-off when device is normal, it is closed when faults itself and small current grounding fault occurs in equipment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720715139.3U CN207518280U (en) | 2017-06-19 | 2017-06-19 | The three-phase imbalance for having both fault current limitation function administers device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720715139.3U CN207518280U (en) | 2017-06-19 | 2017-06-19 | The three-phase imbalance for having both fault current limitation function administers device |
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| Publication Number | Publication Date |
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| CN207518280U true CN207518280U (en) | 2018-06-19 |
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|---|---|---|---|
| CN201720715139.3U Active CN207518280U (en) | 2017-06-19 | 2017-06-19 | The three-phase imbalance for having both fault current limitation function administers device |
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