CN1017576B - Power transformer capable of correcting power factor - Google Patents
Power transformer capable of correcting power factorInfo
- Publication number
- CN1017576B CN1017576B CN 87105430 CN87105430A CN1017576B CN 1017576 B CN1017576 B CN 1017576B CN 87105430 CN87105430 CN 87105430 CN 87105430 A CN87105430 A CN 87105430A CN 1017576 B CN1017576 B CN 1017576B
- Authority
- CN
- China
- Prior art keywords
- layer
- winding
- power
- secondary winding
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Coils Of Transformers For General Uses (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The present invention belongs to a power transformer. Windings are made of two or a plurality of layers of copper or aluminium films, insulating film layers made from polyester, polypropylene, or polytetrafluoroethylene are formed among the windings, and the windings are connected in series. The present invention uses the distributed capacitance of the windings to make the power transformer have super capacity. Therefore, the present invention supplies the lagged reactive power of the transformer, and also supplies the reactive power needed by a whole load. Consequently, the present invention largely enhances the power factor of a power network.
Description
The present invention relates to power transformer, more particularly, relate to employed power transformer in the power supply grid of forming by iron core and primary and secondary winding.
The basic structure of power transformer comprises iron core and elementary winding and secondary winding on the iron core.Traditional power transformer, its elementary winding and secondary winding are all used the copper cash coiled.Though the kind model of transformer is many, because the mechanical strength of copper is good, resistivity is low, and the transformer of copper cash winding still dominates up to now.When the coiling winding, turn-to-turn insulation is very little, general paper bag, yarn bag, the equal no problem of magnet wire insulation.Need use the cable paper reinforced insulation and voltage is higher between layer and the layer.The general concentric arrangement combination of primary and secondary winding.
Be inductive couplings between electricity and the magnetic like this between the winding of the transformer of coiling.The power network user mostly is induction motor, so be that the power factor COS φ of electric power networks itself, user, transformer lags behind and lower.In order to improve power factor, the general practice is the penalty method of The parallel power condenser now, and just inductive load compensates with capacitive load, to reduce its lagging phase, improves power factor.
In addition, also have a kind of power transformer now,, the paper insulation layer is arranged between the metal forming with the metal forming winding that coiling forms as electric conductor.Such foil coil has just changed the shape and the material of lead, and mechanization is convenient in coiling.But invent the people of this transformer, do not expect utilizing distributed capacitance, increase distributed capacitance, thus the winding of its winding be still layer of metal paper tinsel and insulating barrier sequential volume around.This with make the winding of conductor without any substantial difference with copper cash.Such transformer remains inductive load, the no-load power factor is very low, and COS φ remains hysteresis.
Purpose of the present invention aims to provide a kind of transformer of super capacitive, so that rely on the distributed capacitance of its winding itself, passes through enhancements, make power transformer when the 50Hz industrial frequency AC, transfer super capacitive to by perception, when being used for electric power networks, can improve its power factor greatly.For achieving the above object, need that secondary winding is carried out capacitive and handle, therefore must adopt two-layer or two-layer above metallic film (1), every layer thickness is 0.007-0.01mm, then two-layer or two-layer above metallic film (1) being made winding, is insulating thin layer (2) between the winding.Winding total number of turns of the present invention equals the number of turn sum of each layer winding, is to adopt series system and connect between each layer winding.
Above-mentioned metallic film (1) adopts copper or aluminium, and insulating thin layer (2) then is polyester, polypropylene or polytetrafluoroethylmaterial material.
Based between electric winding layers, the existence of turn-to-turn potential difference, exist by the caused leading reactive power of distributed capacitance, but owing to be subjected to the restriction of relative area and spacing and voltage, therefore, this leading reactive power is very small when the 50Hz industrial frequency AC.If we strengthen relative area, reduce spacing, adopt the measures such as medium of bigger dielectric constant, distributed capacitance will increase.Therefore take multiple layer metal diaphragm type winding, as shown in Figure 1, find out between the metal film layer (1) it is insulating thin layer (2) by Fig. 1; By method wiring shown in Figure 2, just improved distributed capacitance greatly.
Adopt series system between each metal level winding of the present invention, be example with the double layer of metal film below, and the principle of its mode of connection be illustrated in conjunction with Fig. 2.
Found out that by Fig. 2 1-3 and 1 '-3 ' is the double-layer metal film winding, A, X end is excitation end, N
1, N
2It is respectively the umber of turn of double layer of metal film.And N
1=N
2, thereby winding total number of turns N=N
1+ N
2So
U
1-U
2＝U
2
Voltage U=the U of A-X end
1=2U
2(Ux=0).
As set up an office 2 positions in the middle of 1,3, the distributed capacitance voltage at consideration 3: 1,2,3 places is Uc
1, Uc
2, Uc
3Locate distributed capacitance C at 1-1 '
1The voltage at two ends
Uc
1＝U
1-U
2＝U
2
Locate distributed capacitance C at 2-2 '
2The voltage at two ends
In 3-3 ' punishment cloth capacitor C
3, the voltage at two ends
Uc
3＝U
2-O＝U
2
So Uc=Uc
1=Uc
2=Uc
3,
The both end voltage of actual distribution electric capacity is to equate everywhere.When electric capacity c and both end voltage Uc are enough big, iron-core coil will produce enough big leading reactive power Qc, that is:
Qc=WCU
2(ω=2 π f, and f=50Hz).
Theoretical foundation of the present invention that Here it is.The present invention has following advantage:
1. be applicable to the voltage of 220V-35KV scope in the electric power networks.Can increase substantially the power factor of electric power networks, and not need to come the compensation power factor as capacitive load with The parallel power condenser.
2. by sensing element, can make transformer obtain lowest loss when zero load, the no-load power factor remains on 70.95 kilter.
3. make simply, cost is low.
Winding construction schematic diagram when Fig. 1 adopts the double layer of metal film for the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Adopt the double layer of metal film as embodiments of the invention.
30KVA 10/0.4KV.3P oil immersion
Maximum reactive power Q cmax=18KVr Vc=740V
Middle reactive power Q cmi=9KVr Vc=520V
Less reactive power Q cmin=3KVr Vc=260V
Minimum reactive power Q c=0 Vi=0
Insulation film is with two-layer: the every layer thickness=0.015mm in polyester ε=2.2
Wide: 220mm
The aluminium film is two-layer altogether, every layer thickness=0.007mm
Width=220mm
The number of turn: 200 three-phases
Capacitance C is 3 * 36uF.
Claims (3)
1, a kind of compact electrical transformers that is installed in the power supply grid, constitute by unshakable in one's determination, primary and secondary winding, elementary winding conductive copper wire material or metal forming coiling, secondary winding metal forming coiling, has insulating thin layer between the winding, it is characterized in that, said secondary winding is handled through capacitive, be to reel with two-layer or two-layer above metal forming and insulation film to form, adopt series system to connect between each layer, utilize the distributed capacitance of winding itself to make power transformer not only play electric power power transformation effect, and can supply whole load required reactive power.
2, the described transformer of claim 1 is characterized in that the insulation film between the metal forming of the secondary winding wherein said is polyester, polypropylene or polytetrafluoroethylene film.
3, the described transformer of claim 1, the output voltage that it is characterized in that its secondary winding is 0.4KV, secondary winding is 220mm by two-layer width, thickness is the aluminium foil of 0.007mm, the folder two layers of thickness is that the polyester film of 0.015mm is that the insulating barrier coiling forms between the two-layer aluminium foil, and two-layer aluminium foil is in series from beginning to end behind the coiled winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105430 CN1017576B (en) | 1987-08-10 | 1987-08-10 | Power transformer capable of correcting power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105430 CN1017576B (en) | 1987-08-10 | 1987-08-10 | Power transformer capable of correcting power factor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87105430A CN87105430A (en) | 1988-02-24 |
| CN1017576B true CN1017576B (en) | 1992-07-22 |
Family
ID=4815317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87105430 Expired CN1017576B (en) | 1987-08-10 | 1987-08-10 | Power transformer capable of correcting power factor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017576B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163491A (en) * | 2010-12-27 | 2011-08-24 | 华为技术有限公司 | Flexible winding and inductor integrated with capacitor characteristic and manufacturing method of flexible winding |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102891000B (en) * | 2011-07-18 | 2016-03-02 | 尤大千 | Lightning protection resonance elimination reactive power compensation capacity transformer |
| CN106971826A (en) * | 2017-03-31 | 2017-07-21 | 浙江埃能德电气有限公司 | Toroidal transformer |
-
1987
- 1987-08-10 CN CN 87105430 patent/CN1017576B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163491A (en) * | 2010-12-27 | 2011-08-24 | 华为技术有限公司 | Flexible winding and inductor integrated with capacitor characteristic and manufacturing method of flexible winding |
Also Published As
| Publication number | Publication date |
|---|---|
| CN87105430A (en) | 1988-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |