CN102270533A - Electric power receiving equipment - Google Patents
Electric power receiving equipment Download PDFInfo
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- CN102270533A CN102270533A CN2010102661725A CN201010266172A CN102270533A CN 102270533 A CN102270533 A CN 102270533A CN 2010102661725 A CN2010102661725 A CN 2010102661725A CN 201010266172 A CN201010266172 A CN 201010266172A CN 102270533 A CN102270533 A CN 102270533A
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- coil
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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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- 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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- Coils Of Transformers For General Uses (AREA)
Abstract
The invention provides a three-phase electric power receiving equipment capable of inhibiting the generation of noises including third harmonic waves and utilizing a power transformer of light weight and less occupation space. The electric power receiving equipment comprises a three-phase transformer (13) at least connecting secondary coils into a triangular shape; and a plurality of balancers (BL1,BL2,BL3). The balancers are equipped with first coils and second coils wound on an iron core. The first and second coils are connected in series in such a way that the flux directions generated by the first and second coils are consistent with each other. The balancers are respectively connected between the output terminals of each phase at the secondary side of a three-phase transformer. Meanwhile, electric power is provided to the three-phase load of each phase at the secondary side of the three-phase transformer and a single-phase load connected in parallel with at least one coil of the first and second coils of the balancers.
Description
Technical field
The present invention relates to the three-phase power receiving equipment, even particularly unbalanced load also can be stably to the three-phase power receiving equipment of the voltage of load balance between supply and demand.
Background technology
For provide and deliver high-tension three-phase alternating voltage more than the 6kV of the user of the big electric power of consumption such as factory, large-scale shop, office building.On the other hand, for the user of the little electric power of consumption such as general family, small-scale shop, small-scale office building, carry out distribution with the low-voltage distributing line of single-phase three-wire formula.
Fig. 4 is the figure of the power receiving apparatus in the single-phase three-wire type distribution system of explanation.Power receiving apparatus receives the three-phase alternating voltage of high pressure, by the piezoelectric transformer that is subjected to that in described power receiving apparatus, disposes the three-phase alternating voltage that receives is transformed to single-phase 200V and single-phase 100V, supplies with to single-phase 200V load L3 or single-phase 100V load L1, L2.
In single-phase three-wire formula distribution system, the load that is connected all is single-phase, and these a large amount of single-phase loads are connected between the line of single-phase three-wire formula distribution wire randomly.And then, according to user's situation, open, close these single-phase loads constantly arbitrarily.Therefore, the electric current that in the circuit of above-mentioned single-phase three-wire formula, flows balance not necessarily.Under opposite extreme situations, the loaded work piece that only on a circuit and the neutral line, is connected sometimes, and the load that is connected on another circuit and the neutral line becomes halted state.
Therefore, the transformer that adopts now end setting in single-phase three-wire formula distribution system to be called as balancer (balancer) makes the mode of line current balance.
As shown in Figure 4, balancer BL be the number of turns than the transformer that is 1 to 1, be set at the end of the distribution of single-phase three-wire formula circuit usually.By balancer is set, electric current that flows through in a certain circuit (outside line A) and the electric current that flows through in another circuit (outside line B) be (at the capacity of load L1 and L2 not simultaneously promptly) not simultaneously, balancer is supplied with offset current io to outside line A and B, eliminates the imbalance of the electric current that flows through among outside line A, the B.
For example, when the electric current that the current ratio that flows flows is big, flow into offset current 2io from neutral line C to balancer in outside line A in outside line B, a part of io of the electric current of inflow is by coil n1 supply load L1.In addition, the remainder io of the electric current of above-mentioned inflow flows into power transformer T by coil n2.
Like this, when balancer is set, because outside line A, B are by balancer induction coupling, even so the load that connects between outside line A and neutral line C or outside line B and neutral line C is unbalanced, perhaps neutral line C is cut off at mains side, and balancer also can play a role so that the balance all the time of the voltage between voltage between outside line A and the neutral line C and outside line B and the neutral line C.
Like this, balancer allows to flow through offset current, makes the voltage (voltage between the outside line A and the neutral line and the outside line B and the neutral line) of the distribution line both sides of single-phase three-wire formula and the current balance type that flows at the mains side of outside line.
Fig. 5 is the figure that explanation has the existing power receiving equipment of three-phase ac transformer and single-phase one coil transformer (balancer).
Among the figure, 51,52,53 is respectively the primary winding of three-phase transformer, the triangularity wiring.51 ', 52 ', 53 ' is respectively and the secondary coil of above-mentioned primary winding electromagnetic coupled, becomes star-star connection.
R, S, T are respectively the distribution wires of a phase, b phase, c phase, supply with three-phase power by these distribution wires to threephase load L.
BL is the balancer that is provided with between the line of above-mentioned distribution wire R, S, T.Balancer BL has first coil 55 and second coil 56 of reeling on iron core 54, make consistent first coil 55 and second coil 56 of being connected in series like that of direction of the magnetic flux that in above-mentioned first coil 55 and second coil 56, produces, be connected in series from this and a little draw mid-point tap n.
The balancer BL that forms like this is connected between the distribution wire S of the distribution wire R of above-mentioned a phase and b phase.
58, the 59, the 60th, single-phase load, single- phase load 58,59,60 perhaps connects between distribution wire R, S between distribution wire R or S and neutral line C.
According to above-mentioned prior art, can be between the lead-out terminal a-b of the three-phase transformer that constitutes the high-tension electricity receiving equipment, between the lead-out terminal b-c, connect balancer BL respectively between the lead-out terminal c-a, between two terminals of balancer BL and neutral point, be connected single-phase load, between each lead-out terminal of above-mentioned three-phase transformer, connect threephase load simultaneously.In addition, the neutral point of above-mentioned three-phase transformer can ground connection.
When the neutral ground of three-phase transformer, can make above-mentioned three-phase transformer miniaturization, can make power transformer in light weight and the saving space.And then can suppress the rising of voltage to earth.
But, although 51,52, the 53 triangularity wiring of the primary winding of above-mentioned three-phase transformer become star-star connection with the secondary coil 51 ', 52 ', 53 ' of this primary winding electromagnetic coupled.Therefore, in the secondary coil of three-phase transformer triple-frequency harmonics takes place, the influence of the triple-frequency harmonics of generation manifests in above-mentioned distribution wire R, S, T.
Under not the situation of the neutral ground of above-mentioned secondary coil, the neutral point potential change.Under the situation of neutral ground, use return path over the ground, triple harmonic currents etc. flow through above-mentioned distribution wire, and electromagnetic induction interference takes place.Therefore, need be at the countermeasure of this problem.
[patent documentation 1] TOHKEMY 2005-197623 communique
Summary of the invention
In view of these problems are made the present invention, purpose provides a kind of three-phase power receiving equipment, and it can suppress generating noise such as triple-frequency harmonics, and is can operating weight light and save the power transformer in space.
The present invention has adopted following means for solving above-mentioned problem.
A kind of power receiving apparatus has at least secondary coil is connected into leg-of-mutton three-phase transformer; With a plurality of balancers, these balancers have first coil and second coil of reeling on iron core, make consistent first coil and second coil of connecting like that of direction of the magnetic flux that from described first coil and second coil, produces, described balancer is connected between the lead-out terminal of each phase of secondary side of described three-phase transformer, and in each threephase load that connects on mutually of the secondary side of described three-phase transformer and to the single-phase load supply capability that on some at least coils of first coil of described balancer and second coil, is connected in parallel.
The present invention is because have above structure, thus can suppress generating noise such as triple-frequency harmonics, can operating weight light and power transformer that save the space constitute the three-phase power receiving equipment.
Description of drawings
Fig. 1 is the figure that the electric power system of the power receiving apparatus that comprises present embodiment is described.
Fig. 2 is the figure of the power receiving apparatus of explanation present embodiment.
Fig. 3 is the figure of the single-phase three-wire type distribution system of explanation.
Fig. 4 is the figure of expression balancer.
Fig. 5 is the figure of the existing power receiving apparatus of explanation.
Symbol description
R, S, T distribution wire
4 threephase loads
11,12,13 primary windings
11 ', 12 ', 13 ' secondary coil
BL1, BL2, BL3 balancer
22 first coils
23 second coils
27,28 single-phase loads
Embodiment
Embodiments of the present invention are described with reference to the accompanying drawings.Fig. 1 is the figure that the electric power system of the power receiving apparatus that comprises present embodiment is described.
In Fig. 1, the 1st, threephase alternator, the 2nd, transmitting transformer, the 3rd, comprise the power receiving apparatus that is subjected to piezoelectric transformer, the 4th, the three-phase alternating current load.
The alternating electromotive force that sends with threephase alternator after boosting by transmitting transformer, is supplied to by transmission and distribution network and comprises the power receiving apparatus that is subjected to piezoelectric transformer.After comprising the power receiving apparatus handle three-phase alternating voltage step-down that receives that is subjected to piezoelectric transformer, by threephase load 4 of three-phase distribution alignment or single-phase load power supply.
Fig. 2 is the figure that explanation comprises the details of the power receiving apparatus that is subjected to piezoelectric transformer.
In Fig. 1 and Fig. 2,11,12,13 is respectively the primary winding of three-phase transformer (being subjected to piezoelectric transformer), becomes star-star connection.11 ', 12 ', 13 ' is respectively the secondary coil with above-mentioned primary winding electromagnetic coupled, the triangularity wiring.
R, S, T are respectively the distribution wires of a phase, b phase, c phase, supply with three-phase power by these distribution wires to threephase load 4.
BL1, BL2, BL3 are respectively the balancers that is provided with between the line of above-mentioned distribution wire R, S, T.
Balancer BL1, BL2, BL3 have first coil 22 and second coil 23 of reeling respectively on iron core 21, make consistent first coil 22 and second coil 23 of being connected in series like that of direction of the magnetic flux that produces from described first coil 22 and second coil 23, being connected in series from this derives a mid-point tap n.
25, the 26th, outside line A and the outside line B of the secondary coil 11 ' that is subjected to piezoelectric transformer as the single-phase three-wire formula distribution line of power supply, its with between the neutral line C that is connected on the above-mentioned mid-point tap n, connect single-phase load (100V load) 27,28 and single-phase load (200V load) 29 respectively.
As shown in Figure 1, constitute the primary winding that is subjected to piezoelectric transformer 11,12,13 one-tenth star-star connections of power receiving apparatus, in addition, with secondary coil 11 ', 12 ', 13 ' the triangularity wiring of the described primary winding electromagnetic coupled of star-star connection.Therefore, be subjected to the magnetic saturation etc. of the iron core of piezoelectric transformer based on formation, even in formation is subjected to the secondary coil of three-phase transformer of piezoelectric transformer triple-frequency harmonics has taken place respectively, this harmonic wave also can circulation in the secondary coil 11 ', 12 ', 13 ' of triangularity wiring.Therefore, can almost ignore because the problem of the inductive interference that triple-frequency harmonics causes.
Fig. 3 is the figure of other examples of explanation balancer.As shown in the figure, balancer has tertiary coil n3 and the 4th coil n4 that reels on the first coil n1 that reels on limit of square shape iron core F and the second coil n2 and another limit at the square shape iron core, make the direction unanimity of the magnetic flux that produces from tertiary coil n3, the first coil n1, the second coil n2 and the 4th coil n4 these coils that are connected in series like that.The balancer that forms like this is connected between the lead-out terminal of each phase of secondary coil of triangularity wiring of described three-phase transformer.In addition, can be the feeder ear of the splicing ear of first coil of each lead-out terminal of the secondary coil of the triangularity wiring of described three-phase transformer and described balancer and second coil as distribution wire.
Balancer BL1, BL2, BL3 be respectively the number of turns than the transformer that is 1 to 1, be connected in parallel with described secondary coil 11 ', 12 ', 13 ' respectively.
By balancer being set in parallel with each secondary coil mutually of formation, even under single- phase load 22 and 23 unbalanced situations, by supplying with offset current io to single- phase load 22,23, can eliminate the imbalance of the electric current that in outside line A, B, flows from neutral point 24.
For example flow through the electric current of load 28 when big, flow into offset current io to balancer, flow out by coil 22,23 from neutral point n in the current ratio that flows through load 27.Like this, when being provided with balancer, because load 27,28 is by coil 22,23 induction couplings, even so the load that connects between outside line A and neutral line C or outside line B and neutral line C is unbalanced, even do not connect neutral line C at mains side (mid point of transformer secondary coil 11 ') in addition, balancer also plays a role so that the balance all the time of the voltage between voltage between outside line A and the neutral line C and outside line B and the neutral line C.Equally, even do not connect the neutral line C of balancer BL2, BL3 at secondary coil 12 ', 13 ' mid point, balancer also plays a role so that the balance all the time of the voltage between voltage between outside line A and the neutral line C and outside line B and the neutral line C.
By balancer is set like this, can make the voltage that on single- phase load 27,28, applies balance all the time.
Here, be ia when establishing the electric current that flows through by balancer BL1, BL3, the electric current that flows through by balancer BL1, BL2 is ib, and the electric current that flows through by balancer BL2, BL3 is ic, and the self-induction of each coil of balancer is L, when mutual inductance is M,
2jωL*ia+zi(2ia-ib-ic)＝jωM(ib+ic)...(1)
2jωL*ib+zi(2ib-ic-ia)＝jωM(ic+ia)...(2)
2jωL*ic+zi(2ic-ia-ib)＝jωM(ia+ib)...(3)
Set up.Here, because
So can obtain from formula (1), (2), (3)
(2ia-ib-ic)(jωL+zi)＝0...(4)
(2ib-ic-ia)(jωL+zi)＝0...(5)
(2ic-ia-ib)(jωL+zi)＝0...(6)。
In addition, from formula (4), (5), (6), can obtain
ia＝ib＝ic...(7)。
In addition, when selected zi makes j ω L+zi=0, can suppress noise effectively with the coil ground connection of Low ESR with balancer.In addition, because the current potential VN of neutral point be
VN=(Eab+Ebc+Eca)/2=0 is so neutral point N can ground connection.
That is, the neutral point n of each balancer can pass through impedance ground Zi ground connection respectively.Therefore, even in distribution wire etc., there is noise to invade, also can makes it be discharged into earthing potential and suppress noise.
Therefore, can protect the equipment that on single-phase three-wire formula distribution line, connects to avoid the noise of invading from the outside.
As mentioned above, according to present embodiment, power receiving apparatus has at least secondary coil is connected into leg-of-mutton three-phase transformer; And balancer, described balancer has first coil and second coil of reeling on iron core, make consistent first coil and second coil of connecting like that of direction of the magnetic flux that from described first coil and second coil, produces, described balancer is connected between the lead-out terminal of each phase of secondary side of described three-phase transformer, in each threephase load that connects on mutually of the secondary side of described three-phase transformer and to the single-phase load supply capability that on some at least coils of first coil of described balancer and second coil, is connected in parallel.
Therefore, even between described single-phase load, imbalance is arranged, also can be to the supply voltage of described single-phase load balance between supply and demand all the time.
In addition, the neutral point 24 of each balancer can pass through impedance ground Zi ground connection respectively.Therefore, even there is noise such as triple-frequency harmonics to invade in distribution wire etc., also can make it is to be discharged into earthing potential to suppress noise.
Claims (4)
1. power receiving apparatus has:
At least secondary coil is connected into leg-of-mutton three-phase transformer; With
A plurality of balancers, described balancer has first coil and second coil of reeling on iron core, make consistent described first coil and second coil of connecting like that of direction of the magnetic flux that produces from described first coil and second coil, described power receiving apparatus is characterised in that
Described balancer is connected between the lead-out terminal of each phase of secondary side of described three-phase transformer, and in each threephase load that connects on mutually of the secondary side of described three-phase transformer and the single-phase load supply capability that on some at least coils of first coil of described balancer and second coil, is connected in parallel.
2. power receiving apparatus has:
At least secondary coil is connected into leg-of-mutton three-phase transformer; With
A plurality of balancers, described balancer has first coil and second coil of reeling on iron core, make consistent described first coil and second coil of connecting like that of direction of the magnetic flux that produces from described first coil and second coil, described power receiving apparatus is characterised in that
Described balancer is connected between the lead-out terminal of each phase of secondary side of described three-phase transformer, by the be connected in series some ground connection of impedance with first coil and second coil of described each balancer, and in each threephase load that connects on mutually of the secondary side of described three-phase transformer and the single-phase load supply capability that on some at least coils of first coil of described balancer and second coil, is connected in parallel.
3. power receiving apparatus according to claim 2 is characterized in that,
Described impedance is the value with the self-induction resonance of a coil of balancer.
4. power receiving apparatus according to claim 2 is characterized in that,
Described balancer has the tertiary coil and the 4th coil of reeling on first coil of reeling on the limit of square shape iron core and second coil and another limit at the square shape iron core, make the direction unanimity of the magnetic flux that from tertiary coil, first coil, second coil and the 4th coil, produces these coils of connecting like that
Between the lead-out terminal of each phase that connects into leg-of-mutton secondary coil of described three-phase transformer, connect described balancer respectively, the feeder ear of the splicing ear of first coil of each lead-out terminal that connects into leg-of-mutton secondary coil of described three-phase transformer and described balancer and second coil as distribution wire.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-128825 | 2010-06-04 | ||
| JP2010128825A JP5033898B2 (en) | 2010-06-04 | 2010-06-04 | Power receiving equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102270533A true CN102270533A (en) | 2011-12-07 |
Family
ID=45052786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102661725A Pending CN102270533A (en) | 2010-06-04 | 2010-08-27 | Electric power receiving equipment |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5033898B2 (en) |
| KR (1) | KR101137316B1 (en) |
| CN (1) | CN102270533A (en) |
| SG (1) | SG176351A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013041995A1 (en) | 2011-09-19 | 2013-03-28 | Koninklijke Philips Electronics N.V. | A nebulizer, a control unit for controlling the same, a nebulizing element and a method of operating a nebulizer |
| WO2015083916A1 (en) * | 2013-12-03 | 2015-06-11 | 서울대학교산학협력단 | Ac electric machine and driving apparatus including same |
| CN104882899B (en) * | 2015-05-28 | 2017-04-26 | 国网山西省电力公司电力科学研究院 | Same-tower double-circuit line unbalance current compensation device and compensation method thereof |
| KR102525798B1 (en) | 2021-03-29 | 2023-04-27 | 주식회사 남전사 | High Voltage Powr Receiving Unit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989405A (en) * | 1982-06-23 | 1984-05-23 | Hitachi Ltd | Three-phase transformer |
| JP2005197623A (en) * | 2004-01-01 | 2005-07-21 | Yuichi Hosokawa | Space-saving power receiving power transformer and single pole type space-saving high voltage power receiving installation |
| CN2727920Y (en) * | 2004-09-06 | 2005-09-21 | 汉石节能设备（河北）有限公司 | Three-phase transformer with balancing function |
| JP2006006093A (en) * | 2004-06-18 | 2006-01-05 | Yuichi Hosokawa | Three-phase ac generator equipped with power/lamp common-use type prime mover |
| JP2006020409A (en) * | 2004-06-30 | 2006-01-19 | Toshiba Corp | Unbalance compensating apparatus and method, power supply circuit |
| JP2007235014A (en) * | 2006-03-03 | 2007-09-13 | Osami Nasuno | Split balanced winding type transformer and single-phase three-wired power distribution system |
| CN101507078A (en) * | 2006-08-30 | 2009-08-12 | 饭田阳三 | Current balancer and low-voltage power distribution system |
| CN101557109A (en) * | 2008-01-17 | 2009-10-14 | 鳥喰貞次 | Three-phase four-cable power distribution system and method for installing balancer in the system |
-
2010
- 2010-06-04 JP JP2010128825A patent/JP5033898B2/en not_active Expired - Fee Related
- 2010-08-27 CN CN2010102661725A patent/CN102270533A/en active Pending
- 2010-08-30 KR KR1020100083832A patent/KR101137316B1/en not_active IP Right Cessation
- 2010-08-31 SG SG2010063311A patent/SG176351A1/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989405A (en) * | 1982-06-23 | 1984-05-23 | Hitachi Ltd | Three-phase transformer |
| JP2005197623A (en) * | 2004-01-01 | 2005-07-21 | Yuichi Hosokawa | Space-saving power receiving power transformer and single pole type space-saving high voltage power receiving installation |
| JP2006006093A (en) * | 2004-06-18 | 2006-01-05 | Yuichi Hosokawa | Three-phase ac generator equipped with power/lamp common-use type prime mover |
| JP2006020409A (en) * | 2004-06-30 | 2006-01-19 | Toshiba Corp | Unbalance compensating apparatus and method, power supply circuit |
| CN2727920Y (en) * | 2004-09-06 | 2005-09-21 | 汉石节能设备（河北）有限公司 | Three-phase transformer with balancing function |
| JP2007235014A (en) * | 2006-03-03 | 2007-09-13 | Osami Nasuno | Split balanced winding type transformer and single-phase three-wired power distribution system |
| CN101507078A (en) * | 2006-08-30 | 2009-08-12 | 饭田阳三 | Current balancer and low-voltage power distribution system |
| CN101557109A (en) * | 2008-01-17 | 2009-10-14 | 鳥喰貞次 | Three-phase four-cable power distribution system and method for installing balancer in the system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011254686A (en) | 2011-12-15 |
| SG176351A1 (en) | 2011-12-29 |
| JP5033898B2 (en) | 2012-09-26 |
| KR101137316B1 (en) | 2012-04-19 |
| KR20110133400A (en) | 2011-12-12 |
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