CN106505573A - Flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device - Google Patents
Flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device Download PDFInfo
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- CN106505573A CN106505573A CN201611083622.0A CN201611083622A CN106505573A CN 106505573 A CN106505573 A CN 106505573A CN 201611083622 A CN201611083622 A CN 201611083622A CN 106505573 A CN106505573 A CN 106505573A
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 72
- 239000004020 conductor Substances 0.000 title claims abstract description 63
- 230000004907 flux Effects 0.000 title claims abstract description 36
- 230000000452 restraining effect Effects 0.000 title claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 405
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000005764 inhibitory process Effects 0.000 description 4
- CBVWMGCJNPPAAR-HJWRWDBZSA-N (nz)-n-(5-methylheptan-3-ylidene)hydroxylamine Chemical compound CCC(C)C\C(CC)=N/O CBVWMGCJNPPAAR-HJWRWDBZSA-N 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a kind of flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device, described device includes：Zero sequence filter, zero sequence filter include three stem stems and six windings, and each umber of turn is identical, insulate between each winding；First and second windings are parallel, be wrapped in by preset direction on the first stem stem, the Parallel planar of two upper and lower windings is parallel with longitudinal tangent plane of the first stem stem, the third and fourth upper and lower winding of coiling, coiling the 5th and the 6th upper and lower winding on the 3rd stem stem on the second stem stem in the same manner；It is divided into two and half windings per phase winding, it is located on two different stem stems respectively, each phase voltage is obtained by two half winding Opposite direction connections being located on different stem stems, to be connected on the neutral conductor of electrical network after three lower half winding terminal short circuits simultaneously, three upper half windings are directly in parallel with three phase network.The present invention provides a low impedance path for the neutral harmonic current produced in power distribution network, filters the neutral harmonic current on the power distribution network neutral conductor.
Description
Technical field
The present invention relates to power quality control technology field, more particularly to a kind of flux compensation type power distribution network neutral conductor zero
Sequence harmonic suppression apparatus.
Background technology
In low-voltage distribution system, three-phase four-wire power supply mode is topmost power supply mode.Modern times with city
Change, the non-linear electrical equipment such as substantial amounts of personal computer, business automation equipment, convertible frequency air-conditioner, mains lighting supply and uninterrupted power source
Equipment can produce substantial amounts of harmonic current, especially Zero-pharse harmonic, though their separate unit power is less, but because of its sum Pang
Greatly, the harmonic pollution for being brought is extremely serious.
Especially 3 times of subharmonic currents are superimposed on the neutral conductor and do not cancel out each other neutral harmonic current, cause and put down completely
The system of weighing apparatus can also produce larger neutral current.Neutral current is excessive to be not only increased distribution network loss and can make
Property line overload overheated.In power distribution network, neutral conductor overload is overheated often causes broken neutral line, broken neutral line make neutral point
Potential shift, the single-phase load that neutral potential offset can be to rated voltage for 220V produce harmful effect, cause three-phase equipment
(such as motor etc.) output drop, overheated or even the anomaly such as burn.
Content of the invention
Above-mentioned situation is based on, the present invention proposes a kind of flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device,
Neutral harmonic current for producing in power distribution network provides a low impedance path, makes neutral harmonic current in zero sequence filter and load
Between flow, flow back to system without the neutral conductor, filter the neutral harmonic current on the power distribution network neutral conductor.
To achieve these goals, the embodiment of technical solution of the present invention is：
A kind of flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device, including zero sequence filter, the zero sequence filter
Ripple device includes iron core and coil；
The iron core includes the first stem stem, the second stem stem, the 3rd stem stem, the first iron yoke and the second iron yoke, the coil bag
Include the first winding, the second winding, the tertiary winding, the 4th winding, the 5th winding and the 6th winding, first winding, second around
The number of turn of group, the tertiary winding, the 4th winding, the 5th winding and the 6th winding is identical；
First winding and the second winding are parallel, be wrapped on first stem stem by preset direction, described first around
Group is parallel with longitudinal tangent plane of first stem stem with the Parallel planar of the second winding, between first winding and the second winding
Insulation；
The tertiary winding and the 4th winding are parallel, be wrapped on second stem stem by the preset direction, and described the
The Parallel planar of three winding and the 4th winding is parallel with longitudinal tangent plane of second stem stem, the tertiary winding and the 4th winding
Between insulate；
5th winding and the 6th winding are parallel, be wrapped on the 3rd stem stem by the preset direction, and described the
The Parallel planar of five windings and the 6th winding is parallel with longitudinal tangent plane of the 3rd stem stem, the 5th winding and the 6th winding
Between insulate；
The head end terminals of first winding are connected between A phase conductors and the load in power supply three-phase conducting wire, described
The end terminations of the first winding connect the end terminations of the 4th winding, the head end terminals connection of the tertiary winding
Between the B phase conductors and the load in the power supply three-phase conducting wire, the end terminations connection of the tertiary winding is described
The end terminations of the 6th winding, the C phases that the head end terminals of the 5th winding are connected in the power supply three-phase conducting wire are led
Between line and the load, the end terminations of the 5th winding connect the end terminations of second winding, and described the
The head end terminals of two windings, the 4th winding and the 6th winding access the neutral conductor after being connected.
Compared with prior art, beneficial effects of the present invention are：Flux compensation type power distribution network neutral conductor zero sequence of the present invention is humorous
The upper and lower winding of two number of turn identicals of winding, the first winding, the tertiary winding on ripple restraining device, zero sequence filter each stem stem
It is upper half winding with the 5th winding, the second winding, the 4th winding and the 6th winding are lower half winding, are divided into two per phase winding
Half winding, is located on two different stem stems respectively, and the voltage of each phase is anti-by two half windings being located on different stem stems
Obtain to connection, while will be connected on the neutral conductor of electrical network after three lower half winding terminal short circuits, three upper half windings with
Three phase network is directly in parallel.After zero sequence filter connects according to the method described above, zero sequence fluxes are cancelled out each other, the electricity to zero sequence property
Stream shows as leakage reactance, and the harmonic wave for zero sequence property provides low impedance path, so that the harmonic current of zero sequence property is filtered in zero sequence
Flow between ripple device and load, system is flowed into without the neutral conductor, realize the inhibition of neutral harmonic.While zero sequence filter
Two upper and lower windings on each stem stem are wound parallel, in the same direction, are reduced by two windings and are contacted with non-magnet material (such as air)
Area, effectively reduces the leakage field of zero sequence filter, reduces the impedance of zero sequence filter, and zero sequence filter is in parallel in the line, and zero
The impedance of sequence wave filter is less, and zero-sequence current more easily flows into zero sequence filter, improves the filter effect of zero sequence filter.
Description of the drawings
Fig. 1 is flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device wiring schematic diagram in one embodiment；
Fig. 2 is the winding method schematic diagram of zero sequence filter in one embodiment；
Fig. 3 is the elementary diagram of zero sequence filter in one embodiment；
Fig. 4 is the winding method schematic diagram one for hindering zero device in one embodiment；
Fig. 5 is the winding method schematic diagram two for hindering zero device in one embodiment；
Fig. 6 is to be suppressed based on flux compensation type power distribution network neutral conductor Zero-pharse harmonic in one specific example of Fig. 1 shown devices
Device wiring schematic diagram.
Specific embodiment
For making the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, to this
Invention is described in further detail.It should be appreciated that specific embodiment described herein is only in order to explain the present invention,
Protection scope of the present invention is not limited.
Flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device in one embodiment, as shown in Figure 1, 2, 3, including
Zero sequence filter 101, the zero sequence filter include iron core and coil；
The iron core includes the first stem stem C1, the second stem stem C2, the 3rd stem stem C3, the first iron yoke Y1 and the second iron yoke Y2,
The coil includes the first winding W11, the second winding W12, tertiary winding W21, the 4th winding W22, the 5th winding W31 and the 6th
Winding W32, the number of turn of first winding, the second winding, the tertiary winding, the 4th winding, the 5th winding and the 6th winding are identical；
First winding and the second winding are parallel, be wrapped on first stem stem by preset direction, described first around
Group is parallel with longitudinal tangent plane of first stem stem with the Parallel planar of the second winding, between first winding and the second winding
Insulation；
The tertiary winding and the 4th winding are parallel, be wrapped on second stem stem by the preset direction, and described the
The Parallel planar of three winding and the 4th winding is parallel with longitudinal tangent plane of second stem stem, the tertiary winding and the 4th winding
Between insulate；
5th winding and the 6th winding are parallel, be wrapped on the 3rd stem stem by the preset direction, and described the
The Parallel planar of five windings and the 6th winding is parallel with longitudinal tangent plane of the 3rd stem stem, the 5th winding and the 6th winding
Between insulate；
The head end terminals 11 of first winding are connected between A phase conductors and the load in power supply three-phase conducting wire, institute
The end terminations 11 ' for stating the first winding connect the end terminations 22 ' of the 4th winding, and the head end of the tertiary winding connects
Line end 21 is connected between the B phase conductors in the power supply three-phase conducting wire and the load, the end wiring of the tertiary winding
The end terminations 32 ' of 21 ' connection of end the 6th winding, the head end terminals 31 of the 5th winding are connected to the power supply
Between C phase conductors and the load in three-phase conducting wire, the end terminations 31 ' of the 5th winding connect second winding
End terminations 12 ', the head end terminals 12,22,32 of second winding, the 4th winding and the 6th winding are accessed after being connected
The neutral conductor.
Here, the Parallel planar of the first winding and the second winding as indicated with 2, is first winding and the second winding in institute
First stem stem one end the plane for being formed together is stated, the Parallel planar of the tertiary winding and the 4th winding is described the in the same manner
Three winding and the 4th winding are in described second stem stem one end and the plane that formed, the 5th winding and the 6th winding together
Parallel planar is the 5th winding and the 6th winding in described 3rd stem stem one end and the plane that formed together.
Longitudinal tangent plane of the first stem stem is that cutting plane obtained by object is opened in the axis cutting of parallel first stem stem, in the same manner
Longitudinal tangent plane of two stem stems is that cutting plane obtained by object is opened in the axis cutting of parallel second stem stem, and the longitudinal direction of the 3rd stem stem is cut
Face is that the cutting plane obtained by object is opened in the axis cutting of parallel 3rd stem stem.
Specifically, upper and lower two windings are wound with each core limb of zero sequence filter respectively, the first winding,
Three winding and the 5th winding are upper half winding, and the second winding, the 4th winding and the 6th winding are lower half winding, on three core limbs
Six umber of turns equal, be divided into two and half windings per phase winding, be located on two different stem stems respectively, each phase
Voltage is obtained by two half winding Opposite direction connections being located on different stem stems, while after by three lower half winding terminal short circuits
It is connected on the neutral conductor of electrical network, three upper half windings are directly in parallel with three phase network.After connecting shown in Fig. 2, zero sequence magnetic
Lead to and cancel out each other, leakage reactance is shown as to the electric current of zero sequence property, the harmonic wave for zero sequence property provides low impedance path, so that zero
The harmonic current of sequence matter is between low pressure magnetic flux offset-type power distribution network neutral conductor Zero-pharse harmonic restraining device and nonlinear-load
Flowing, flows into system without the neutral conductor, realizes the inhibition of neutral harmonic.
Here, the winding on each core limb of zero sequence filter is using two strands are parallel, equidirectional winding, and reserves two strands
Four terminals of line are connected with system and other windings, two strands respectively from upper half winding and lower half winding, two strands it
Between insulate.The winding method can reduce the area that upper and lower winding is contacted with non-magnet material (such as air), effectively reduce zero sequence
The leakage field of wave filter, reduces the impedance of zero sequence filter, and zero sequence filter is in parallel in the line, and the impedance of zero sequence filter is got over
Little, zero-sequence current more easily flows into zero sequence filter, improves the filter effect of zero sequence filter.
It is evidenced from the above discussion that, flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device of the present invention, is power distribution network
The neutral harmonic current of middle generation provides a low impedance path, neutral harmonic current is flowed between zero sequence filter and load
Dynamic, system is flowed back to without the neutral conductor, filter the neutral harmonic current on the power distribution network neutral conductor.
Additionally, in a specific example, the flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device is also wrapped
Zero device of resistance, first switch, second switch and the 3rd switch is included, zero device of the resistance includes four-limbed, the 7th winding, the 8th winding
With the 9th winding；
7th winding, the 8th winding and the 9th winding are wrapped on the four-limbed in the same direction, the 7th winding,
Insulate between 8th winding and the 9th winding, the number of turn of the 7th winding, the 8th winding and the 9th winding is identical；
The head end terminals of the 7th winding connect the A phase conductors in the power supply three-phase conducting wire, the 7th winding
End terminations connect the head end terminals and the load of the first winding of the zero sequence filter, the 8th winding respectively
Head end terminals connect B phase conductors in the power supply three-phase conducting wire, the end terminations of the 8th winding connect respectively
The head end terminals and the load of the zero sequence filter tertiary winding, the head end terminals connection of the 9th winding are described
C phase conductors in power supply three-phase conducting wire, the end terminations of the 9th winding connect respectively the zero sequence filter the 5th around
The head end terminals and the load, the first switch and the 7th winding parallel of group, the second switch and described the
Eight winding parallels, the 3rd switch and the 9th winding parallel.
Here, zero device of resistance can effectively suppress the zero-sequence current caused by system unbalanced source voltage to pass through zero sequence filter
The neutral conductor is flowed into, the filter effect of zero sequence filter is improved, is met practical application needs.
When A, B, C three-phase positive-negative sequence electric current by hinder zero device when, due to three-phase positive-negative sequence current equal in magnitude, angle phase
120 ° are differed from, and three-phase windings are wrapped in same iron core column, so the magnetic flux superposition sum for producing is zero, zero device of resistance is hindered to which
Anti- is also zero, when neutral harmonic current is by hindering zero device, due to neutral harmonic current same-phase, so the magnetic flux superposition for producing
Very big magnetic flux can be produced for three's sum, zero device is now hindered and very big impedance is presented to neutral harmonic current, from having reached drop
The purpose of low zero-sequence current.
Specifically, zero device of resistance can control whether to come into operation according to actual requirement of engineering, when first switch, second switch
When switching off with the 3rd, zero device of resistance comes into operation, and when first switch, second switch and the 3rd switch closure, zero device of resistance is not
Come into operation.
Additionally, in a specific example, the 7th winding, the 8th winding and the 9th winding be parallel, by clockwise or
Counterclockwise it is wrapped on the four-limbed, Parallel planar and the institute of the 7th winding, the 8th winding and the 9th winding
The longitudinal tangent plane for stating four-limbed is parallel.
Here, the 7th winding, the 8th winding and the 9th winding Parallel planar as shown in figure 4, for the described 7th around
Group, the 8th winding and the 9th winding are in described four-limbed one end and the plane that formed together.
Longitudinal tangent plane of the four-limbed is that the cutting plane obtained by object is opened in the axis cutting of parallel four-limbed.
Specifically, as shown in figure 4,401 is A lines, 402 is B lines, and 403 is C lines, and system power is by such as figure direction of arrow stream
Enter zero device of resistance, system three-phase conducting wire is wrapped on a core limb with sequence, winding method is wound on using compenzine same parallel
On root core limb, mutually insulated between compenzine.
Additionally, in a specific example, the 7th winding, the 8th winding and the 9th winding be parallel, by clockwise or
Counterclockwise it is wrapped on the four-limbed, Parallel planar and the institute of the 7th winding, the 8th winding and the 9th winding
The horizontal tangent plane for stating four-limbed is parallel.
Here, the 7th winding, the 8th winding and the 9th winding Parallel planar as shown in figure 5, for the described 7th around
Group, the 8th winding and the 9th winding are in described four-limbed one end and the plane that formed together.
The horizontal tangent plane of the four-limbed is that the cutting plane obtained by object is opened in the axis cutting of vertical four-limbed.
Specifically, as shown in figure 5,501 for hindering the core limb of zero device, 502 is the interior winding of A phase line coilings, and 503 is B phases
The middle winding of line coiling, 504 is the outer winding of C phase line coilings.Identical direction is all pressed along iron per strand in A, B, C compenzine
Stem stem sub-thread winds, and compenzine is distributed in laminar in space, and, used as interior winding, B phase lines are used as middle winding, C phase lines for A phase lines
As outer winding.
Here, above two can greatly reduce the leakage field of zero device of resistance using parallel, equidirectional winding method, improve which
Service behaviour.
Additionally, in a specific example, the 7th winding, the 8th winding and the 9th winding are successively in the direction of the clock
It is wrapped on the four-limbed, or the 7th winding, the 8th winding and the 9th winding is wound successively counterclockwise
On the four-limbed.
Specifically, zero device winding method of resistance only the line of same sequence, i.e., three successively along iron core by direction clockwise or counterclockwise
Winding (first around complete further around second, second around complete further around the 3rd).Hinder zero device and leach system voltage imbalance and cause
Zero-sequence current, when neutral harmonic current is by hindering zero device, due to neutral harmonic current same-phase, so the magnetic flux for producing is folded
Add as three's sum and can produce very big magnetic flux, now hinder zero device and very big impedance is presented to neutral harmonic current, from reaching
Reduce the purpose of zero-sequence current.
Additionally, in a specific example, the preset direction is clockwise or counterclockwise.
Specifically, six windings of zero sequence filter are wrapped on stem stem using clockwise or counterclockwise.Press
After connecting shown in Fig. 2, zero sequence fluxes are cancelled out each other, and show as leakage reactance to the electric current of zero sequence property, are the harmonic wave of zero sequence property
Low impedance path is provided, so that the harmonic current of zero sequence property presses down in low pressure magnetic flux offset-type power distribution network neutral conductor Zero-pharse harmonic
Flow between device processed and nonlinear-load, system is flowed into without the neutral conductor, realize the inhibition of neutral harmonic.
Additionally, in a specific example, the first winding of the zero sequence filter, the second winding, the tertiary winding, the 4th
The wire gauge of winding, the 5th winding and the 6th winding is identical.
Additionally, in a specific example, the wire rule of the 7th winding, the 8th winding and the 9th winding of zero device of the resistance
Lattice are identical.
Here, wire gauge includes lead material, radius (round wire) or width and thickness (strip conductor).
Specifically, the wire gauge of zero device winding of zero sequence filter and resistance determines according to circuit rated current size.
In order to more fully understand said apparatus, a flux compensation type power distribution network neutral conductor zero of the present invention detailed below
The application example of sequence harmonic suppression apparatus.
As shown in fig. 6, the application example can include zero sequence filter 601, zero device 602 of resistance and switch K1, K2, K3；
As shown in Fig. 2 the zero sequence filter includes iron core and coil；
The iron core includes the first stem stem C1, the second stem stem C2, the 3rd stem stem C3, the first iron yoke Y1 and the second iron yoke Y2,
The coil includes the first winding W11, the second winding W12, tertiary winding W21, the 4th winding W22, the 5th winding W31 and the 6th
Winding W32, the number of turn of first winding, the second winding, the tertiary winding, the 4th winding, the 5th winding and the 6th winding are identical；
As shown in figure 3, first winding and the second winding are parallel, be wrapped on first stem stem by preset direction,
The Parallel planar of first winding and the second winding is parallel with longitudinal tangent plane of first stem stem, first winding and
Insulate between two windings；
The tertiary winding and the 4th winding are parallel, be wrapped on second stem stem by the preset direction, and described the
The Parallel planar of three winding and the 4th winding is parallel with longitudinal tangent plane of second stem stem, the tertiary winding and the 4th winding
Between insulate；
5th winding and the 6th winding are parallel, be wrapped on the 3rd stem stem by the preset direction, and described the
The Parallel planar of five windings and the 6th winding is parallel with longitudinal tangent plane of the 3rd stem stem, the 5th winding and the 6th winding
Between insulate；
The preset direction is clockwise or counterclockwise；
Zero device of the resistance includes four-limbed, the 7th winding, the 8th winding and the 9th winding, the 7th winding, the 8th
Insulate between winding and the 9th winding, the number of turn of the 7th winding, the 8th winding and the 9th winding is identical, the described 7th around
Group, the 8th winding and the 9th winding be parallel, by being wrapped on the four-limbed clockwise or counterclockwise, the described 7th around
The Parallel planar of group, the 8th winding and the 9th winding is parallel with longitudinal tangent plane of the four-limbed；As shown in figure 4,401 is A
Line, 402 is B lines, and 403 is C lines, and system power flows into zero device of resistance by such as the figure direction of arrow, by system three-phase conducting wire with sequence winding
On a core limb, winding method is wound on same core limb parallel using compenzine, mutually insulated between compenzine；
The head end terminals of the 7th winding of zero device of the resistance connect the A phase conductors in the power supply three-phase conducting wire, described
The end terminations of the 7th winding connect the head end terminals 11 and load of the first winding of the zero sequence filter, the resistance respectively
The head end terminals of the 8th winding of zero device connect the B phase conductors in the power supply three-phase conducting wire, the end of the 8th winding
Terminals connect the head end terminals 21 and the load of the zero sequence filter tertiary winding respectively, and the 9th of zero device of the resistance the
The head end terminals of winding connect the C phase conductors in the power supply three-phase conducting wire, the end terminations difference of the 9th winding
Connect the head end terminals 31 and the load of the 5th winding of the zero sequence filter, the first winding of the zero sequence filter
End terminations 11 ' connect the end terminations 22 ' of the 4th winding, and the end of the tertiary winding of the zero sequence filter connects
Line end 21 ' connects the end terminations 32 ' of the 6th winding, the end terminations of the 5th winding of the zero sequence filter
The end terminations 12 ' of 31 ' connection second windings, the second winding of the zero sequence filter, the 4th winding and the 6th around
The head end terminals 12,22,32 of group access the neutral conductor after being connected.
Switch K1 and the 7th winding parallel of zero device of the resistance, switch the 8th winding parallel of K2 and zero device of the resistance, open
Close the 9th winding parallel of K3 and zero device of the resistance.
Hinder zero device to control whether to come into operation according to actual requirement of engineering, in Fig. 6, when switch K1, K2, K3 disconnect
When, zero device of resistance comes into operation, and when K1, K2, K3 closure is switched, zero device of resistance does not come into operation.
First winding of the zero sequence filter, the second winding, the tertiary winding, the 4th winding, the 5th winding and the 6th around
The wire gauge of group is identical.The wire gauge of the 7th winding, the 8th winding and the 9th winding of zero device of the resistance is identical.Here,
Wire gauge includes lead material, radius (round wire) or width and thickness (strip conductor).Specifically, zero device of zero sequence filter and resistance
The wire gauge of winding determines according to circuit rated current size.
Here, on the circuit of zero sequence filter access point, series connection one hinders zero device, and the triple line accessed from mains side is twined with sequence
It is wound on zero device core limb of resistance, winding method is wound on same core limb parallel using compenzine, between compenzine mutually absolutely
Edge.When the electric current of A, B, C three-phase positive-negative sequence is by hindering zero device, as three-phase positive-negative sequence current is equal in magnitude, angle is differed
120 °, and three-phase windings are wrapped in same iron core column, so the magnetic flux superposition sum for producing is zero, zero device of resistance is to its impedance
Also it is zero, when neutral harmonic current is by hindering zero device, due to neutral harmonic current same-phase, so the magnetic flux for producing is superposed to
Three's sum can produce very big magnetic flux, now hinder zero device and assume very big impedance to neutral harmonic current, from having reached reduction
The purpose of zero-sequence current.The leakage field that zero device of resistance can be greatly reduced using parallel, equidirectional winding method, improves its workability
Energy.
Be wound with upper and lower two windings on zero sequence filter each core limb respectively, six on three core limbs around
Group equal turn numbers, structure are consistent, and after connecting shown in Fig. 6, zero sequence fluxes are cancelled out each other, and the electric current of zero sequence property is shown as
Leakage reactance, the harmonic wave for zero sequence property provide low impedance path, so that the harmonic current of zero sequence property is in low pressure magnetic flux offset-type
Flow between power distribution network neutral conductor Zero-pharse harmonic restraining device and nonlinear-load, do not flow into system, realize neutral harmonic
Inhibition.Zero sequence filter is in parallel in the line, i.e., be parallel relationship with load, and the zero sequence impedance of wave filter is less, zero sequence
Electric current more easily flows into zero sequence filter, and zero-sequence current shunting action is more obvious, and filter effect is also better.To zero sequence filtering
Device winding makees following design：Winding on each core limb is using two strands are parallel, equidirectional winding, and reserves the four of two strands
Individual terminals are connected with system and other windings, and two strands insulate between two strands respectively from upper half winding and lower half winding.
The winding method can reduce the area that upper and lower winding is contacted with non-magnet material (such as air), effectively reduce zero sequence filter
Leakage field, reduce zero sequence filter impedance, improve zero sequence filter filter effect.
It is evidenced from the above discussion that, the present embodiment hinders the zero sequence that zero device effectively can suppress to be caused by system unbalanced source voltage
Electric current flows into the neutral conductor by zero sequence filter, and resistance zero device three windings are parallel, by being wrapped in core clockwise or counterclockwise
On post, the Parallel planar of three windings is parallel with longitudinal tangent plane of stem stem, can be significantly using parallel, equidirectional winding method
The leakage field of zero device of resistance is reduced, its service behaviour is improved；The load unbalanced zero-sequence current for causing of zero sequence filter filtering appts, right
Single-phase load cause serious uneven there is obvious load balance to act on, two circles of winding on zero sequence filter each stem stem
The upper and lower winding of number identical, is divided into two and half windings per phase winding, is located on two different stem stems respectively, each phase
Voltage is obtained by two half winding Opposite direction connections being located on different stem stems, while after by three lower half winding terminal short circuits
It is connected on the neutral conductor of electrical network, three upper half windings are directly in parallel with three phase network.Zero sequence filter connects according to the method described above
After connecing, zero sequence fluxes are cancelled out each other, and zero sequence impedance reduces, and the harmonic wave for zero sequence property provides low impedance path.Zero sequence filter simultaneously
Two upper and lower windings on ripple device each stem stem are parallel, wind in the same direction, reduce by two windings and connect with non-magnet material (such as air)
Tactile area, effectively reduces the leakage field of zero sequence filter, reduces the impedance of zero sequence filter, improves the filtering effect of zero sequence filter
Really, and to a certain extent reduce wave filter volume, reduces cost, the method for designing are simple, and exploitativeness is strong, reliability
High.
Each technical characteristic of embodiment described above arbitrarily can be combined, for making description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Therefore can not be construed as limiting the scope of the patent.It should be pointed out that for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (8)
1. a kind of flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device, it is characterised in that including zero sequence filter, institute
Stating zero sequence filter includes iron core and coil；
The iron core includes that the first stem stem, the second stem stem, the 3rd stem stem, the first iron yoke and the second iron yoke, the coil include
One winding, the second winding, the tertiary winding, the 4th winding, the 5th winding and the 6th winding, first winding, the second winding,
The number of turn of three winding, the 4th winding, the 5th winding and the 6th winding is identical；
First winding and the second winding are parallel, be wrapped on first stem stem by preset direction, first winding and
The Parallel planar of the second winding is parallel with longitudinal tangent plane of first stem stem, between first winding and the second winding absolutely
Edge；
The tertiary winding and the 4th winding are parallel, be wrapped on second stem stem by the preset direction, the described 3rd around
Group is parallel with longitudinal tangent plane of second stem stem with the Parallel planar of the 4th winding, between the tertiary winding and the 4th winding
Insulation；
5th winding and the 6th winding are parallel, be wrapped on the 3rd stem stem by the preset direction, the described 5th around
Group is parallel with longitudinal tangent plane of the 3rd stem stem with the Parallel planar of the 6th winding, between the 5th winding and the 6th winding
Insulation；
The head end terminals of first winding are connected between A phase conductors and the load in power supply three-phase conducting wire, and described first
The end terminations of winding connect the end terminations of the 4th winding, and the head end terminals of the tertiary winding are connected to institute
State between the B phase conductors in power supply three-phase conducting wire and the load, the end terminations connection the described 6th of the tertiary winding
The end terminations of winding, the head end terminals of the 5th winding be connected to the C phase conductors in the power supply three-phase conducting wire and
Between the load, the end terminations of the 5th winding connect the end terminations of second winding, described second around
The head end terminals of group, the 4th winding and the 6th winding access the neutral conductor after being connected.
2. flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device according to claim 1, it is characterised in that also
Including hindering zero device, first switch, second switch and the 3rd switch；
Zero device of the resistance includes four-limbed, the 7th winding, the 8th winding and the 9th winding；
7th winding, the 8th winding and the 9th winding are wrapped on the four-limbed in the same direction, the 7th winding, the 8th
Insulate between winding and the 9th winding, the number of turn of the 7th winding, the 8th winding and the 9th winding is identical；
The head end terminals of the 7th winding connect the A phase conductors in the power supply three-phase conducting wire, the end of the 7th winding
Termination line end connects the head end terminals and the load of the first winding of the zero sequence filter, the head of the 8th winding respectively
Termination line end connects the B phase conductors in the power supply three-phase conducting wire, and the end terminations of the 8th winding connect described respectively
The head end terminals and the load of the zero sequence filter tertiary winding, the head end terminals of the 9th winding connect the power supply
C phase conductors in three-phase conducting wire, the end terminations of the 9th winding connect the 5th winding of the zero sequence filter respectively
Head end terminals and the load, the first switch and the 7th winding parallel, the second switch with the described 8th around
Group is in parallel, and the described 3rd switchs and the 9th winding parallel.
3. flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device according to claim 2, it is characterised in that institute
State the 7th winding, the 8th winding and the 9th winding parallel, by being wrapped on the four-limbed clockwise or counterclockwise, institute
The Parallel planar for stating the 7th winding, the 8th winding and the 9th winding is parallel with longitudinal tangent plane of the four-limbed.
4. flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device according to claim 2, it is characterised in that institute
State the 7th winding, the 8th winding and the 9th winding parallel, by being wrapped on the four-limbed clockwise or counterclockwise, institute
The Parallel planar for stating the 7th winding, the 8th winding and the 9th winding is parallel with the horizontal tangent plane of the four-limbed.
5. flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device according to claim 2, it is characterised in that institute
State the 7th winding, the 8th winding and the 9th winding to be wrapped in the direction of the clock on the four-limbed successively, or described
Seven windings, the 8th winding and the 9th winding are wrapped on the four-limbed successively counterclockwise.
6. flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device according to claim 1, it is characterised in that institute
Preset direction is stated for clockwise or counterclockwise.
7. flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device according to claim 1, it is characterised in that institute
State the wire rule of the first winding, the second winding, the tertiary winding, the 4th winding, the 5th winding and the 6th winding of zero sequence filter
Lattice are identical.
8. flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device as claimed in any of claims 2 to 5,
Characterized in that, the wire gauge of the 7th winding, the 8th winding and the 9th winding of zero device of the resistance is identical.
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| CN201611083622.0A CN106505573A (en) | 2016-11-30 | 2016-11-30 | Flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device |
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| CN201611083622.0A CN106505573A (en) | 2016-11-30 | 2016-11-30 | Flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device |
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