CN202008919U - Zigzag transformer for low-voltage distribution network - Google Patents
Zigzag transformer for low-voltage distribution network Download PDFInfo
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- CN202008919U CN202008919U CN2011200729992U CN201120072999U CN202008919U CN 202008919 U CN202008919 U CN 202008919U CN 2011200729992 U CN2011200729992 U CN 2011200729992U CN 201120072999 U CN201120072999 U CN 201120072999U CN 202008919 U CN202008919 U CN 202008919U
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Abstract
The utility model relates to a zigzag transformer for a low-voltage distribution network, which belongs to the technical field of the low-voltage network distribution of electric power. According to the zigzag transformer, Ia1-2 is connected with aA, Ia1-1 is connected with Ib2-1, Ia2-1 is connected with Ic1-1, Ia2-2 is connected with Ic2-2, Ib1-1 is connected with Ic2-1, Ib1-2 is connected with 2B, Ib2-2 is connected with the Ic2-2, Ic1-2 is connected with 2C, and the Ic2-2 is connected with an N zero line. According to the zigzag transformer for the low-voltage distribution network, the turn number of the windings of a primary side and a secondary side is the same, and the windings of each phase are mutually in cross connection; and by mutually compensating the magnetic fluxes of iron cores, the windings of each phase form high impedance to positive-sequence and negative-sequence voltage and also form low impedance to zero-sequence voltage. The zigzag transformer is connected to a load circuit of the low-voltage distribution network in parallel, and zero-sequence current can pass through the zigzag transformer but does not pass through a neutral line any longer, so that the compensation of the zero-sequence current is realized, the aims of saving energy and reducing emission are achieved, and the loss of energy resources is effectively saved.
Description
Technical field
The utility model belongs to electric power low-voltage distribution network technical field, is specially the tortuous transformer that is used for low-voltage network.
Background technology
Current AC electric power systems generally all is A, B, C three-phase, and the positive sequence of electric power system, negative phase-sequence, zero-sequence component be come according to the order of A, B, C three-phase fixed.The leading mutually B of positive sequence: A is 120 degree mutually, and the leading mutually C of B is 120 degree mutually, and the leading mutually A of C is 120 degree mutually.Negative phase-sequence: A falls behind B 120 degree mutually mutually, and B falls behind C 120 degree mutually mutually, and C falls behind A 120 degree mutually mutually.Zero sequence: the ABC three-phase phase is identical, and which is not leading mutually yet, keeps up with yet.The appearance of positive sequence, negative phase-sequence, zero sequence is in order to analyze at system voltage, when asymmetry appears in electric current, the asymmetrical component of three-phase to be resolved into symmetrical component (positive and negative preface) and zero-sequence component in the same way.So long as three-phase system just can decomposite above-mentioned three components.For ideal power system, because three is symmetrical, so the numerical value of negative phase-sequence and zero-sequence component all is zero (Here it is, and we often say the reason of having only positive sequence component under the normal condition).Make three-phase reach balance, will manage to filter the negative phase-sequence and the zero-sequence component that exist in the electrical network.This is the theoretical foundation that is designed for the tortuous transformer of low-voltage network, the tortuous transformer that uses in the electrical network generally only is used for high-voltage fence at present, in the power transmission and distribution electrical network of △ type wiring,, generally use tortuous transformer to use as grounding transformer because do not connect wires.
The utility model content
At the above-mentioned problems in the prior art, the purpose of this utility model is to design a kind of technical scheme that is used for the tortuous transformer of low-voltage network is provided, can make zero-sequence current through tortuous transformer and no longer by the neutral line, thereby realize the zero-sequence current compensation.
The described tortuous transformer that is used for low-voltage network is characterized in that described tortuous transformer Ia
1-2A advances mutually, Ia
1-1Connect Ib
2-1, Ia
2-1Connect Ic
1-1, Ia
2-2Connect Ic
2-2, Ib1
-1Connect Ic
2-1, Ib
1-2B advances mutually, Ib
2-2Connect Ic
2-2,, Ic
1-2C advances mutually, Ic
2-2Connect the N zero line.
The described tortuous transformer that is used for low-voltage network is characterized in that described tortuous transformer is the identical three-phase winding transformer of former and deputy limit umber of turn.
The above-mentioned tortuous transformer that is used for low-voltage network, no-load voltage ratio is set to 1:1, be that former and deputy limit umber of turn is identical, like this can be so that the output current of responding at the electric current of former limit input and secondary is identical, phase place is identical, so transformer is the very low path of resistance value to zero-sequence current.The mutual interconnection of tortuous each phase winding of transformer by the magnetic flux of mutual compensation iron core, makes each phase winding form high impedance to positive sequence, negative sequence voltage, and residual voltage is formed Low ESR.Tortuous transformers connected in parallel is inserted in the load circuit of low-voltage network, can make zero-sequence current through tortuous transformer and no longer by the neutral line, thereby realize the zero-sequence current compensation, reach the energy-saving and emission-reduction purpose, effectively energy savings loss.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Below in conjunction with Figure of description the utility model is described further.
As shown in the figure, tortuous transformer is the identical three-phase winding transformer of former and deputy limit umber of turn, Ia
1-2A advances mutually, Ia
1-1Connect Ib
2-1, Ia
2-1Connect Ic
1-1, Ia
2-2Connect Ic
2-2, Ib1
-1Connect Ic
2-1, Ib
1-2B advances mutually, Ib
2-2Connect Ic
2-2,, Ic
1-2C advances mutually, Ic
2-2Connect the N zero line.The no-load voltage ratio of described tortuous transformer (ZigZag transformer) is set to 1:1, and promptly former and deputy limit umber of turn is identical, like this can be so that identical with the output current of secondary induction at the electric current of former limit input.The mode of connection by tortuous transformer gets:
Ia1(t)?=?Ia2(t)
I b1 (t)?=
?I b2 (t)
I c1 (t)?=
?I c2 (t)
By former secondary no-load voltage ratio relation
I a2 (t)?=
?I b1 (t)
I b2 (t)?=
?I c1 (t)
I c2 (t)?=
?I a1 (t)
So draw;
I A1 (t)=
I B1 (t)=
I C1 (t)
The current amplitude that promptly flows into the former limit of tortuous transformer equates, phase place is identical, so transformer is the very low path of resistance value to zero-sequence current.So utilize this principle, tortuous transformers connected in parallel is inserted in the load circuit of low-voltage network, can make zero-sequence current no longer pass through the neutral line through tortuous transformer.The mutual interconnection of tortuous each phase winding of transformer by the magnetic flux of mutual compensation iron core, makes each phase winding form high impedance to positive sequence, negative sequence voltage, and residual voltage is formed Low ESR.In tortuous transformers connected in parallel connecting system, can make zero-sequence current through tortuous transformer and no longer by the neutral line, thereby realize the zero-sequence current compensation.
Claims (2)
1. the tortuous transformer that is used for low-voltage network is characterized in that described tortuous transformer Ia
1-2A advances mutually, Ia
1-1Connect Ib
2-1, Ia
2-1Connect Ic
1-1, Ia
2-2Connect Ic
2-2, Ib1
-1Connect Ic
2-1, Ib
1-2B advances mutually, Ib
2-2Connect Ic
2-2,, Ic
1-2C advances mutually, Ic
2-2Connect the N zero line.
2. the tortuous transformer that is used for low-voltage network as claimed in claim 1 is characterized in that described tortuous transformer is the identical three-phase winding transformer of former and deputy limit umber of turn, its three-phase equilibrium degree in 5%, characteristics such as the zero line overcurrent capability is big.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200729992U CN202008919U (en) | 2011-03-18 | 2011-03-18 | Zigzag transformer for low-voltage distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200729992U CN202008919U (en) | 2011-03-18 | 2011-03-18 | Zigzag transformer for low-voltage distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202008919U true CN202008919U (en) | 2011-10-12 |
Family
ID=44750579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200729992U Expired - Fee Related CN202008919U (en) | 2011-03-18 | 2011-03-18 | Zigzag transformer for low-voltage distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202008919U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014191023A1 (en) * | 2013-05-28 | 2014-12-04 | Siemens Aktiengesellschaft | Apparatus for reducing a magnetic unidirectional flux component in the core of a transformer |
| CN107507698A (en) * | 2017-08-30 | 2017-12-22 | 杭州钱江电气集团股份有限公司 | A kind of transformer for suppressing function with D.C. magnetic biasing |
| CN110365031A (en) * | 2019-07-24 | 2019-10-22 | 西安西电电气研究院有限责任公司 | A kind of Voltage unbalance compensation device and zero sequence current compensation method |
-
2011
- 2011-03-18 CN CN2011200729992U patent/CN202008919U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014191023A1 (en) * | 2013-05-28 | 2014-12-04 | Siemens Aktiengesellschaft | Apparatus for reducing a magnetic unidirectional flux component in the core of a transformer |
| US20160125999A1 (en) * | 2013-05-28 | 2016-05-05 | Siemens Aktiengesellschaft | Apparatus for Reducing a Magnetic Unidirectional Flux Component in the Core of a Transformer |
| US10083789B2 (en) * | 2013-05-28 | 2018-09-25 | Siemens Aktiengesellschaft | Apparatus for reducing a magnetic unidirectional flux component in the core of a transformer |
| CN107507698A (en) * | 2017-08-30 | 2017-12-22 | 杭州钱江电气集团股份有限公司 | A kind of transformer for suppressing function with D.C. magnetic biasing |
| CN110365031A (en) * | 2019-07-24 | 2019-10-22 | 西安西电电气研究院有限责任公司 | A kind of Voltage unbalance compensation device and zero sequence current compensation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111012 Termination date: 20140318 |