CN203734322U - Zero-sequence current shunt - Google Patents
Zero-sequence current shunt Download PDFInfo
- Publication number
- CN203734322U CN203734322U CN201420094602.3U CN201420094602U CN203734322U CN 203734322 U CN203734322 U CN 203734322U CN 201420094602 U CN201420094602 U CN 201420094602U CN 203734322 U CN203734322 U CN 203734322U
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- CN
- China
- Prior art keywords
- zero
- sequence current
- phase
- coils
- current shunt
- 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 - Fee Related
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Classifications
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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
Abstract
The utility model relates to the field of a power distribution system, and particularly relates to a zero-sequence current shunt used for reducing influences imposed on a transformer by zero-sequence current. The current shunt comprises an iron core which is in the shape of a square with an intermediate bar and three primary windings, wherein each of the windings is divided into two coils, and the two coils are wound on two different core columns respectively; each of the core columns comprises an inner layer of the coils and an outer layer of the coils, the winding directions and the number of turns of the coils are identical, the head parts of the three windings are connected to a phase A of a live line, a phase B of the live line and a phase C of the live line respectively, and the tail parts are connected and then connected to a zero line. The zero-sequence current shunt enables positive and negative sequence impedance to be very great and enables zero-sequence impedance to be very small through an ingenious wiring mode, thereby enabling most of the zero-sequence current to flow back to a phase A, a phase B and a phase C but not the transformer through the device provided by the utility model, and reducing influences imposed on the transformer by the zero-sequence current.
Description
Technical field
The utility model relates to field of power distribution, is specifically related to a kind of for reducing the zero-sequence current shunt of zero-sequence current on transformer impact.
Background technology
Three-phase four-wire system is topmost supply power mode in low-voltage network, and the power consumption equipment in power distribution network is mostly taking single-phase load as main.Commercial power is taking inductive load as many, and resistive and perceptual mixing in civilian electricity consumption, taking resistive as main.Due to power consumption equipment asynchronism, transformer nearly all moves under three-phase imbalance state, can cause neutral point drift and neutral line zero-sequence current to strengthen when three-phase imbalance.Due to the increase of zero-sequence current, can increase the loss of transformer, and produce a large amount of eddy current loss in fuel tank folder, likely burn transformer.
Summary of the invention
For addressing the above problem, the utility model, with reference to the structure of transformer, has designed a kind of zero-sequence current shunt, utilizes magnetic field superposition and magnetic field cancellation, reduces zero sequence impedance, shares a little zero-sequence currents more, reduces the zero-sequence current that flows to transformer.
The zero-sequence current shunt that the utility model provides, comprises one " saying " font iron core and three armature windings, and each winding is divided into two coils, respectively on two different stem stems; On each stem stem, have inside and outside two-layer coil, coil winding-direction is identical, equal turn numbers, and the stem of three windings connects respectively A, B, C three-phase firewire, its afterbody common connecting to neutral line that is connected.
In said apparatus, described armature winding adopts drum type brake.
This zero-sequence current shunt is dry impregnation formula, adopts wind cooling.
The utility model adopts after the above-mentioned mode of connection, and zero-sequence current and positive-negative sequence current flow into coil.Because the phase angle of zero-sequence current is identical, equal and opposite in direction, magnetic flux equal and opposite in direction, phase angle that on each post, two coils produce are identical, opposite direction, are 0 thereby make resultant flux.Due to A, B, C three-phase zero-sequence current by time do not produce magnetic flux, therefore impedance is very little.Positive and negative order electric current by time, on A post, exterior loop is by A phase current, interior loop is by C phase current, because inside and outside coil inflow current is contrary, and phase angle differs 120 degree, magnetic field is vector superposed.
ф A is total=1.732 ф A
Magnetic flux density increases by 1.732 times, and positive and negative like this order impedance is very large, sees from positive and negative order side the transformer that is equivalent to a no-load running, by the electric current of shunt, only has very little exciting curent.
The utility model, by the mode of connection cleverly, makes positive-negative sequence impedance very large, and zero sequence impedance is very little, makes most of zero-sequence current flow back to A, B, C three-phase by this device and inflow transformer not, reduces the impact of zero-sequence current on transformer.
Brief description of the drawings
Fig. 1 is the utility model elementary diagram;
In figure, 1, A post, 2, B post, 3, C post, 4, the first winding, 5, the second winding, 6, the tertiary winding.
Embodiment
A kind of zero-sequence current shunt, as shown in the figure, comprise one " saying " font iron core and three armature windings, iron core comprises A post 1, B post 2,3 three stem stems of C post, each winding is divided into two coils, respectively on two different stem stems, on each stem stem, there is inside and outside two-layer coil, coil winding-direction on same winding and same stem stem is all identical, inner-outer coil equal turn numbers on same stem stem, concrete, the front end coil of the first winding 4 is around the outside of A post 1, rear end coil is around the inner side of B post 2, and its stem is connected with A phase firewire.The front end coil of the second winding 5 is around the outside of B post 2, and rear end coil is around the inner side of C post 3, and its stem is connected with B phase firewire.The front end coil of the tertiary winding 6 is around the outside of C post 3, and rear end coil is around the inner side of A post 1, and its stem is connected with C phase firewire.The afterbody of three windings is connected and jointly connects zero line.Described armature winding adopts drum type brake.This zero-sequence current shunt is dry impregnation formula, adopts wind cooling.
Claims (3)
1. a zero-sequence current shunt, is characterized in that: comprise one " saying " font iron core and three armature windings, each winding is divided into two coils, respectively on two different stem stems; On each stem stem, have inside and outside two-layer coil, coil winding-direction is identical, equal turn numbers, and the stem of three windings connects respectively A, B, C three-phase firewire, its afterbody common connecting to neutral line that is connected.
2. zero-sequence current shunt according to claim 1, is characterized in that: described armature winding adopts drum type brake.
3. zero-sequence current shunt according to claim 1, is characterized in that: this zero-sequence current shunt is dry impregnation formula, adopts wind cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420094602.3U CN203734322U (en) | 2013-06-07 | 2014-03-04 | Zero-sequence current shunt |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320326599.9 | 2013-06-07 | ||
| CN201320326599 | 2013-06-07 | ||
| CN201420094602.3U CN203734322U (en) | 2013-06-07 | 2014-03-04 | Zero-sequence current shunt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203734322U true CN203734322U (en) | 2014-07-23 |
Family
ID=51204368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420094602.3U Expired - Fee Related CN203734322U (en) | 2013-06-07 | 2014-03-04 | Zero-sequence current shunt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203734322U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675947A (en) * | 2014-11-20 | 2016-06-15 | 国家电网公司 | Multi-disk inductive shunt |
-
2014
- 2014-03-04 CN CN201420094602.3U patent/CN203734322U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675947A (en) * | 2014-11-20 | 2016-06-15 | 国家电网公司 | Multi-disk inductive shunt |
| CN105675947B (en) * | 2014-11-20 | 2018-11-16 | 国家电网公司 | A kind of polydisc inductive shunt |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170306 Address after: The central Ji'nan city in Shandong Province Yu Hang Road 250000 No. 59 building 6 layer Zichen Patentee after: Ji'nan Luyuan Electric Power Design Consulting Co., Ltd. Address before: 250000 Ji'nan Province Flyover District, No. 2 North Road, No. 86066, No. Patentee before: ELECTRIC POWER ECONOMIC TECHNOLOGY INSTITUTE OF JINAN POWER SUPPLY COMPANY |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20200304 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |