CN208385174U - A kind of three-phase transformer - Google Patents
A kind of three-phase transformer Download PDFInfo
- Publication number
- CN208385174U CN208385174U CN201820989489.3U CN201820989489U CN208385174U CN 208385174 U CN208385174 U CN 208385174U CN 201820989489 U CN201820989489 U CN 201820989489U CN 208385174 U CN208385174 U CN 208385174U
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- CN
- China
- Prior art keywords
- phase
- copper bar
- shorted
- neutral point
- winding
- 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.)
- Withdrawn - After Issue
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 126
- 229910052802 copper Inorganic materials 0.000 claims abstract description 126
- 239000010949 copper Substances 0.000 claims abstract description 126
- 238000004804 winding Methods 0.000 claims abstract description 68
- 230000007935 neutral effect Effects 0.000 claims abstract description 59
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Coils Of Transformers For General Uses (AREA)
Abstract
The utility model relates to a kind of three-phase transformers.It includes a being arranged successively, b, c phase winding, a, b, the head end lead of c phase winding passes through a respectively, b, c phase terminal copper bar is connected with corresponding low-tension bushing, a, b, the end leads of c phase winding are shorted a on copper bar with neutral point respectively, b, c phase is shorted a connection, b phase, which is shorted, is a little located at a, c phase is shorted between a little, neutral point is shorted on copper bar and is connected with neutral point lead copper bar, neutral point, which is shorted on copper bar, is located at a, b phase is shorted part or b between a little, it is the small bore part that flow area is less than other parts that c phase, which is shorted the part between a little, neutral point lead copper bar is connected on small bore part.As a result, in this connection property point lead copper bar when calculate the tie point position that the summation of the resistance of a, b, c phase winding can be made roughly equal, so that three-phase resistance balanced ratio is up to state standards defined range, avoid the generation of safety accident.
Description
Technical field
The utility model relates to a kind of three-phase transformers.
Background technique
Transformer be for convert alternating voltage, electric current and transmit the static electrical equipment of one kind of alternating current.In power grid
Commonly used three-phase transformer, when the three-phase resistance imbalance of winding, the load current for being likely to result in some winding is larger,
Overload is excessive, causes winding and transformer oil to overheat, accelerates insulation ag(e)ing, accelerates transformer oil deterioration, reduces transformer oil
Insulation performance reduces transformer life, or even burns winding, causes transformer station high-voltage side bus failure, seriously jeopardizes the peace of electrical equipment
Row for the national games.Actual in use, three-phase equilibrium is not present, but unbalance factor can be controlled in a certain range.
For 35kV and following voltage class oil-immersed power transformer, national standard GB/T 6451 is provided, for distribution transformer, winding
D.C. resistance unbalance factor: phase (when having neutral point extraction) is no more than 4%, and line (when no neutral point is drawn) is no more than 2%；It is right
In power transformer, winding D.C. resistance unbalance factor: mutually for no more than 2%, line is no more than 1%.In order to reduce low pressure winding
D.C. resistance unbalance factor, low-voltage lead are generally centrally arranged, and are avoided a certain phase or two-phase copper bar length too long, are led to direct current
It is excessive to hinder unbalance factor.
A kind of structural schematic diagram of existing three-phase transformer is as shown in Figure 1 comprising body and is mounted on body
Low pressure winding 1, its low voltage lead structure is star connection and neutral point is drawn, and low pressure winding 1 includes a phase winding, b phase winding
With c phase winding, three head end leads 2 draw from the end of low pressure winding 1 be connected to a phase terminal copper bar 5, b phase terminal copper respectively
4 and c phase terminal copper bar 3 is arranged, a phase terminal copper bar 5, b phase terminal copper bar 4 and c phase terminal copper bar 3 are connected on low-tension bushing 7, a phase
Lead copper bar 5, b phase terminal copper bar 4 and c phase terminal copper bar 3 are fixed on the body of transformer.The end leads of low pressure winding 1
10 draw from 1 end of low pressure winding, are respectively connected to neutral point and are shorted copper bar 11, neutral point lead copper bar 6 is shorted copper from neutral point
It is drawn on row 11 and is connected to low-tension bushing 7.
But the distance that the end leads of above-mentioned three-phase transformer draw copper bar to neutral point is different, far from neutral
The low resistance that point is drawn at copper bar is larger, so that three-phase resistance is uneven, is easy to produce safety accident.
Utility model content
The purpose of this utility model is to provide a kind of three-phase transformers, uneven with the resistance for solving existing three-phase transformer
The problem of weighing apparatus rate is larger, and safety accident easily occurs.
To achieve the above object, the technical solution of the three-phase transformer of the utility model is as follows:
Three-phase transformer includes a, b, c phase winding being arranged successively, the head end lead of a, b, c phase winding pass through respectively a, b,
C phase terminal copper bar is connected with corresponding low-tension bushing, and the end leads of a, b, c phase winding are shorted on copper bar with neutral point respectively
A, b, c phase are shorted a connection, and b phase, which is shorted, to be a little shorted between a little positioned at a, c phase, are connected with neutral point on neutral point short circuit copper bar and draw
Line copper bar, neutral point are shorted that be located at the part that a, b phase are shorted the part between a little or b, c phase are shorted between a little on copper bar be through-flow
Area is less than the small bore part of other parts, and neutral point lead copper bar is connected on small bore part.Property in this connection as a result,
The coil resistance that can make a, b, c phase winding, lead copper bar resistance and neutral point are calculated when point lead copper bar is shorted copper bar electricity
The roughly equal tie point position of the summation of resistance enables three-phase resistance balanced ratio to be up to state standards defined range, avoids
The generation of safety accident.
Further, the width of the small bore part is less than the width of other parts to realize the reduction of flow area.
This is because this mode is easier to realize, process relatively simple.
Further, the neutral point is shorted the unilateral reduction that width is realized equipped with notch in the width direction of copper bar.
This is because the technics comparing that notch is processed on neutral point short circuit copper bar is simple, lower production costs.
Further, the coil resistance of b phase winding is greater than the coil resistance of a phase winding and c phase winding.So, make
It obtains neutral point and is shorted copper bar compared with the position of the tie point of neutral point lead copper bar convenient for calculating, it is easier to by three-phase resistance tune
Section balance.
Further, the cross-sectional area of b phase terminal copper bar is less than the cross-sectional area and c phase terminal copper bar of a phase terminal copper bar
Cross-sectional area.So, in the lesser situation of length of b phase terminal copper bar, by reducing its cross-sectional area, so that its
Resistance is larger, it is easy to accomplish three-phase resistance balance.
Further, a phase terminal copper bar and c phase terminal copper bar are symmetrically arranged in the two sides of b phase terminal copper bar.In this way
One comes that a phase terminal copper bar is identical with the length of c phase terminal copper bar, and resistance is equal, is easy to three-phase resistance adjustment.
Further, a phase terminal copper bar, b phase terminal copper bar, c phase terminal copper bar and neutral point are drawn copper bar and are passed through respectively
It is flexible coupling and is connected with low-tension bushing.It can be convenient assembly this is because being arranged to be flexible coupling in lead copper bar and between being flexible coupling,
Rigging error is larger caused by avoiding because of scale error, and low-tension bushing is not connected with copper bar is drawn；Simultaneously after the assembly is completed, low
When pressing sleeve pipe is by external force, transformer may be made to generate the defect of oil leak, buffer function can be played using being flexible coupling, increased
Safety.
Further, the neutral point lead copper bar is shorted copper bar with neutral point by welding and is connected.This is because weldering
It connects in succession easy to operate, and does not have to default mounting structure.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of three-phase transformer in the prior art；
Fig. 2 is the structural schematic diagram of the three-phase transformer of the utility model.
Description of symbols: 1. low pressure windings；2. head end lead；3.c phase terminal copper bar；4.b phase terminal copper bar；5.a phase
Lead copper bar；6. neutral point lead copper bar；7. low-tension bushing；8. being flexible coupling；9. conductor grip；10. end leads；11. neutral point
It is shorted copper bar；12. body.
Specific embodiment
The embodiments of the present invention is described further with reference to the accompanying drawing.
The specific embodiment 1 of the three-phase transformer of the utility model, structure is as shown in Figure 2, it should be noted that at this
In the description of utility model, if there is "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outside"
Equal terms, the orientation or positional relationship of instruction are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing
The utility model, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation structure
It makes and operates, therefore should not be understood as limiting the present invention.
The three-phase transformer of above-mentioned the utility model includes body 12 and the low pressure winding 1 that is mounted on body 12, low pressure
Winding 1 includes a phase winding, b phase winding and the c phase winding being sequentially arranged from right to left, and c phase winding and a phase winding are located at b
The arranged on left and right sides of phase winding, the end of a phase winding, b phase winding and c phase winding pass through below end leads 10 and winding
Neutral point is shorted copper bar 11 and connects, and the head end of low pressure winding 1 passes through head end lead 2 and a phase terminal copper bar 5, b phase terminal copper
Row 4 is connected with c phase terminal copper bar 3 with the corresponding low-tension bushing 7 in top, a phase terminal copper bar 5, b phase terminal copper bar 4 and c phase terminal
8 it is connected between copper bar 3 and low-tension bushing 7 by being flexible coupling.Neutral point is shorted copper bar 11 and is connected to by neutral point lead copper bar 6
On low-tension bushing 7.The end leads 10 of a phase winding are connected to the right side that neutral point is shorted copper bar 11, the end leads of b phase winding
10 are connected to the middle section that neutral point is shorted copper bar 11, and the end leads 10 of c phase winding are connected to neutral point and are shorted copper bar 11
Left side.It is that flow area is less than the small of other parts that neutral point, which is shorted on copper bar 11 and is shorted the part between a little positioned at a, b phase,
Section, neutral point lead copper bar 6 are connected to neutral point and are shorted on the small bore part of copper bar 11.
The lower right corner that above-mentioned neutral point is shorted copper bar 11 is equipped with notch, is shorted copper bar 11 with this to reduce neutral point
The size of width direction reduces width of the small bore part relative to other parts, increases the resistance of small bore part.This
The coil resistance of b phase winding in embodiment be greater than a phase winding and c phase winding coil resistance, b phase terminal copper bar 4 it is transversal
Area is less than the cross-sectional area of a phase terminal copper bar 5 and c phase terminal copper bar 3, the section of a phase terminal copper bar 5 and c phase terminal copper bar 3
The balance adjustment of three-phase resistance is so convenient in two sides that are equal and being arranged symmetrically in b phase terminal copper bar 4.Neutral point is shorted
Copper bar 11 is connected by welding with neutral point lead copper bar 6 and connects, and the position of solder joint can be obtained by calculation, and thus reduces from weldering
The resistance of point distance remotely, increases the resistance more nearby with a distance from solder joint, realizes that three-phase resistance is approximately equal.
When implementing the three-phase transformer of above-mentioned the utility model, first by a phase winding b phase winding and c phase winding from dextrad
A left side is separately mounted on the body 12 of transformer, and head end lead 2 and end leads 10 are connected to the head end of low pressure winding 1
And end, take the lesser b phase terminal copper bar 4 of cross-sectional area to be connected to head end lead 2 and be flexible coupling between 8, by a phase terminal copper bar
5 and c phase terminal copper bar 3 is connected to head end lead 2 and is flexible coupling between 8, then will be flexible coupling and 8 be connected with low-tension bushing 7, by a
Phase terminal copper bar 5, b phase terminal copper bar 4 and c phase terminal copper bar 3 are fixed on body 12 by conductor grip 9.Neutral point is shorted
Copper bar 11 is connected in the end leads 10 of low pressure winding 1, and a phase winding, b phase winding and c phase can be made by being gone out by theoretical calculation
The coil resistance of winding, lead copper bar resistance and neutral point are shorted copper bar resistance and roughly equal tie point position, will in
Property point lead-out wire be welded on neutral point be shorted copper bar 11 on.Thereby ensure that the resistance of a phase winding, b phase winding and c phase winding is flat
Weighing apparatus, can achieve the range of national standard defined, ensure that the quality of three-phase transformer, reduce the generation of safety accident.
In the embodiments of the present invention 2, the cross-sectional area of a phase terminal copper bar, b phase terminal copper bar and c phase terminal copper bar
It is equal, by adjusting the relationship between the coil resistance between a phase winding, b phase winding and c phase winding, while by adjusting
Property point be shorted copper bar and neutral point lead copper bar tie point position so that three-phase resistance substantial equilibrium, reaches satisfaction country
The prescribed limit of standard.
In the embodiments of the present invention 3, the section of b phase terminal copper bar is less than the section of c phase terminal copper bar, c phase terminal
The section of copper bar is less than the section of a phase terminal copper bar, by increasing the coil resistance of b phase winding, reduces the coil electricity of c phase winding
Resistance, while the position for being shorted the tie point of copper bar and neutral point lead copper bar by adjusting neutral point, so that three-phase resistance is substantially
Balance, reaches the prescribed limit for meeting national standard.
In other embodiments, the sectional area of reduction neutral point short circuit copper bar can be realized by other means, such as
The two sides that neutral point is shorted the width direction of copper bar are respectively provided with notch, or are shorted the centre of the width direction of copper bar in neutral point
Position setting fluting.
In other embodiments, it can be shorted a little to be shorted between a little with c phase in the b phase that neutral point is shorted copper bar and be arranged small section
Face part.
Claims (8)
1. a kind of three-phase transformer, including a, b, c phase winding being arranged successively, the head end lead of a, b, c phase winding passes through respectively
A, b, c phase terminal copper bar are connected with corresponding low-tension bushing, and the end leads of a, b, c phase winding are shorted copper bar with neutral point respectively
On a, b, c phase be shorted connection, b phase, which is shorted, a little to be located at a, c phase and is shorted between a little, is connected with neutrality on neutral point short circuit copper bar
Point lead copper bar, it is characterised in that: neutral point, which is shorted on copper bar, is located at that a, b phase are shorted part between a little or b, c phase are shorted a little
Between part be small bore part that flow area is less than other parts, neutral point lead copper bar is connected to small bore part
On.
2. three-phase transformer according to claim 1, it is characterised in that: the width of the small bore part is less than other portions
Point width to realize the reduction of flow area.
3. three-phase transformer according to claim 2, it is characterised in that: the neutral point is shorted in the width direction of copper bar
The unilateral reduction that width is realized equipped with notch.
4. three-phase transformer according to claim 3, it is characterised in that: the coil resistance of b phase winding be greater than a phase winding and
The coil resistance of c phase winding.
5. three-phase transformer according to claim 4, it is characterised in that: the cross-sectional area of b phase terminal copper bar is less than a coupling
The cross-sectional area of line copper bar and the cross-sectional area of c phase terminal copper bar.
6. three-phase transformer according to claim 5, it is characterised in that: a phase terminal copper bar and c phase terminal copper bar pair
Claim the two sides for being arranged in b phase terminal copper bar.
7. three-phase transformer according to claim 6, it is characterised in that: a phase terminal copper bar, b phase terminal copper bar, c coupling
Line copper bar and neutral point extraction copper bar pass through to be flexible coupling respectively to be connected with low-tension bushing.
8. three-phase transformer according to claim 1-6, it is characterised in that: the neutral point lead copper bar passes through
Welding is shorted copper bar with neutral point and is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820989489.3U CN208385174U (en) | 2018-06-26 | 2018-06-26 | A kind of three-phase transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820989489.3U CN208385174U (en) | 2018-06-26 | 2018-06-26 | A kind of three-phase transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208385174U true CN208385174U (en) | 2019-01-15 |
Family
ID=64964492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820989489.3U Withdrawn - After Issue CN208385174U (en) | 2018-06-26 | 2018-06-26 | A kind of three-phase transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208385174U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108922746A (en) * | 2018-06-26 | 2018-11-30 | 河南森源电气股份有限公司 | three-phase transformer |
-
2018
- 2018-06-26 CN CN201820989489.3U patent/CN208385174U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108922746A (en) * | 2018-06-26 | 2018-11-30 | 河南森源电气股份有限公司 | three-phase transformer |
| CN108922746B (en) * | 2018-06-26 | 2023-12-22 | 河南森源电气股份有限公司 | Three-phase transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190115 Effective date of abandoning: 20231222 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190115 Effective date of abandoning: 20231222 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |