CN202736669U - Transformer with improved low-voltage leads - Google Patents
Transformer with improved low-voltage leads Download PDFInfo
- Publication number
- CN202736669U CN202736669U CN 201220235414 CN201220235414U CN202736669U CN 202736669 U CN202736669 U CN 202736669U CN 201220235414 CN201220235414 CN 201220235414 CN 201220235414 U CN201220235414 U CN 201220235414U CN 202736669 U CN202736669 U CN 202736669U
- Authority
- CN
- China
- Prior art keywords
- voltage lead
- low
- phase low
- phase
- copper busbar
- 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
Links
Images
Landscapes
- Coils Of Transformers For General Uses (AREA)
Abstract
The utility model discloses a transformer with improved low-voltage leads. The transformer comprises abreast three-phase low-voltage leads, a neutral point bus copper bar and a neutral point outlet line, wherein the neutral point bus copper bar consists of a first copper bus and a second copper bus arranged side by side; the abreast three-phase low-voltage leads include an A-phase low-voltage lead and a C-phase low-voltage lead at both ends, and an intermediate B-phase low-voltage lead; the A-phase low-voltage lead and the C-phase low-voltage lead are connected with both ends of the first copper bus and the second copper bus; the B-phase low-voltage lead is only connected with the first copper bus; and the neutral point outlet line is connected with the second copper bus. The transformer provided by the utility model is simple and low-cost, can control DC resistance unbalance rate in an acceptability limit, and is suitable for batch production.
Description
Technical field
The utility model relates generally to a kind of improvement of low voltage lead structure of distribution transformer.
Background technology
The distribution transformer of low-pressure side 400V, general connection set is Dyn11 or Yyn0, namely the low-pressure side lead-in wire is " star " connection.Stipulate the winding D.C. resistance unbalance factor in the standard simultaneously: for being not more than 4%, line is for being not more than 2% mutually.The pin configuration of the low pressure winding of traditional distribution transformer as shown in Figure 1, low-voltage lead directly is connected on the bus bar copper row, because the low pressure winding electric is forced down, electric current is large, D.C. resistance is less, therefore the dc resistance proportion of lead-in wire is larger, when especially transformer capacity is larger, very easily overflow because of pin configuration problems affect D.C. resistance unbalance factor (especially phase resistance unbalance factor).In order to reach the D.C. resistance balance, general way is: need dedicated calculation resistance unbalance rate when 1, electromagnetism calculates; 2, before the mounting coil, the phase sequence of coil is determined in the distribution resistance work of advanced line circle; 3, increase the sectional area of neutral point busbar, reduce the lead-in wire D.C. resistance.Therefore operation increase, cost increase, and unbalance factor often still can be higher.
Summary of the invention
Goal of the invention: for the problem and shortage of above-mentioned existing existence, the purpose of this utility model provides the follow-on transformer of a kind of low-voltage lead, transformer phase resistance unbalance factor can be controlled in 2%, and can reduce the line resistance unbalance factor equally, thereby meet standard code.
Technical scheme: for achieving the above object, the utility model is by the following technical solutions: a kind of low-voltage lead improved three-phase transformer, comprise three-phase low-voltage lead side by side, neutral point bus bar copper row and neutral lead, described neutral point bus bar copper row is comprised of first copper busbar of arranging side by side and the second copper busbar, described three-phase low-voltage lead side by side comprises mutually low-voltage lead of the A phase low-voltage lead that is in both sides and C, and the B phase low-voltage lead that mediates, wherein A phase low-voltage lead and C phase low-voltage lead and the first copper busbar be connected the two ends of copper busbar and be connected, and B phase low-voltage lead only is connected with the first copper busbar, and described neutral lead is connected with the second copper busbar.
As preferably, the tie point of described B phase low-voltage lead and the first copper busbar, corresponding with the position of the tie point of described neutral lead.
As preferably, the gap between described the first copper busbar and the second copper busbar is 5～6mm.
As preferably, described the first copper busbar is identical with the sectional area of the second copper busbar, and its sectional area sum equals the sectional area of each phase low-voltage lead.
Beneficial effect: compared with prior art, the utlity model has following advantage: simple and easy, cost is low, and can guarantee that the D.C. resistance unbalance factor is controlled in the acceptability limit, be fit to mass production.
Description of drawings
Fig. 1 is the structural representation of the low-voltage lead of traditional transformer;
Fig. 2 is the utility model embodiment 1 described structural representation;
Fig. 3 is the utility model embodiment 2 described structural representations.
Wherein, the first copper busbar 1, the second copper busbar 2, A phase low-voltage lead 3, B phase low-voltage lead 4, C phase low-voltage lead 5, neutral lead 6.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment only is used for explanation the utility model and is not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present utility model.
Embodiment 1
As shown in Figure 2, the follow-on transformer of low-voltage lead described in the utility model, adopt the three-phase transformer of " star " connection mainly for the low pressure winding leads, it comprises three-phase low-voltage lead side by side, neutral point bus bar copper row and neutral lead 6, wherein the neutral point bus bar copper row is comprised of first copper busbar 1 of arranging side by side and the second copper busbar 2 that are in a horizontal plane together, gap between them is 5～6mm, and described side by side three-phase low-voltage lead comprises mutually low-voltage lead (z) 5 of A phase low-voltage lead (x) 3 that be in both sides and C, and the B phase low-voltage lead (y) 4 that mediates, wherein A phase low-voltage lead 3 are connected with C phase low-voltage lead with the first copper busbar 1 be connected the two ends of copper busbar 2 and be connected, and B phase low-voltage lead 4 only is connected with the first copper busbar 1, described neutral lead 6 and 2 welding of the second copper busbar, this welding should be level and smooth, reliably, bright and clean, guarantee to link to each other without foreign material such as welding slags between two copper busbars.Simultaneously, the tie point of B phase low-voltage lead 4 and the first copper busbar 1, corresponding with the position of the tie point of described neutral lead 6, and described the first copper busbar 1 is identical with the sectional area of the second copper busbar 2, and the sectional area that equals each phase low-voltage lead of its sectional area.
From Fig. 2, can list following formula:
R
A is total=R
A-a+ R
The a phase winding+ R
X-0+ R
0-0
R
B is total=R
B-b+ R
The b phase winding+ R
Y-0+ R
0-0
R
C is total=R
C-c+ R
The c phase winding+ R
Z-0+ R
0-0
R
The a phase winding≈ R
The b phase winding≈ R
The c phase winding(same material, technique coiling form)
R
A-a≈ R
C-c〉=R
B-b(summing up according to actual distribution transforming)
After implementing this programme, the neutral point bus can be regarded as 4 parts that resistance value equates, the resistance value of establishing every part is R, and the series and parallel principle by resistance can obtain following formula so:
R
x-0=R
z-0=（1R×3R）/（3R+1R）=0.75R；
R
y-0=（2R×2R）/（2R+2R）=R；
∣ R
A-a-R
B-b∣ ≈ ∣ R
A-a-R
C-c∣ ≈ ∣ R
B-b-R
C-c∣≤0.4R (maximum that the bending distance of actual this section differs can be considered by 0.4R);
Can be summarized as following formula by above all formula:
∣ R
A is total-R
B is total∣ ≈ ∣ R
A is total-R
C is total∣ ≈ ∣ R
B is total-R
C is total∣≤0.15R(can find out that the phase resistance value is more or less the same substantially) because R in fact
The a phase winding≈ R
The b phase winding≈ R
The c phase winding＞10R,
So have: phase resistance unbalance factor ≈ 0.15R/10R * 100%=1.5%.Therefore by after implementing this programme, the phase resistance unbalance factor can be controlled in 2% substantially, less than 4% requirement of standard code; The line resistance unbalance factor can be reduced equally.
As shown in Figure 3, be that transformer low-voltage lead improves the another kind of form of expression, its place different from embodiment 1 is that it is to adopt the mode that is arranged above and below that the first copper busbar 1 and the second copper busbar 2 are arranged side by side.
Claims (4)
1. follow-on transformer of low-voltage lead, it is characterized in that: comprise three-phase low-voltage lead side by side, neutral point bus bar copper row and neutral lead, described neutral point bus bar copper row is comprised of first copper busbar of arranging side by side and the second copper busbar, described three-phase low-voltage lead side by side comprises mutually low-voltage lead of the A phase low-voltage lead that is in both sides and C, and the B phase low-voltage lead that mediates, wherein A phase low-voltage lead and C phase low-voltage lead and the first copper busbar be connected the two ends of copper busbar and be connected, and B phase low-voltage lead only is connected with the first copper busbar, and described neutral lead is connected with the second copper busbar.
2. the follow-on transformer of described low-voltage lead according to claim 1 is characterized in that: the tie point of described B phase low-voltage lead and the first copper busbar, and corresponding with the position of the tie point of described neutral lead.
3. the follow-on transformer of described low-voltage lead according to claim 1, it is characterized in that: the gap between described the first copper busbar and the second copper busbar is 5～6mm.
4. the follow-on transformer of described low-voltage lead according to claim 1, it is characterized in that: described the first copper busbar is identical with the sectional area of the second copper busbar, and its sectional area sum equals the sectional area of each phase low-voltage lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220235414 CN202736669U (en) | 2012-05-23 | 2012-05-23 | Transformer with improved low-voltage leads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220235414 CN202736669U (en) | 2012-05-23 | 2012-05-23 | Transformer with improved low-voltage leads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202736669U true CN202736669U (en) | 2013-02-13 |
Family
ID=47662344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220235414 Expired - Fee Related CN202736669U (en) | 2012-05-23 | 2012-05-23 | Transformer with improved low-voltage leads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202736669U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107680785A (en) * | 2017-10-24 | 2018-02-09 | 山东达驰电气有限公司 | Control the unbalanced lead arrangement of D.C. resistance |
-
2012
- 2012-05-23 CN CN 201220235414 patent/CN202736669U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107680785A (en) * | 2017-10-24 | 2018-02-09 | 山东达驰电气有限公司 | Control the unbalanced lead arrangement of D.C. resistance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103354156B (en) | The pin configuration of the two transformer with split winding of a kind of three dimensional wound core | |
| CN202736669U (en) | Transformer with improved low-voltage leads | |
| CN203351363U (en) | Lead structure of three-dimensional rolled core transformer with double split windings | |
| CN204741354U (en) | Double -deck alternating -current winding of asymmetric integer groove three -phase of four branch roads | |
| CN202008906U (en) | Energy-saving rectifier transformer with out-of-phase anti-parallel connection and in-line type line output | |
| CN202018875U (en) | Triangular transformer with built-in high-low voltage leads | |
| CN201562537U (en) | Internal circulation current by-pass structure of iron core frame for ultra-high voltage converter transformer | |
| CN104767397A (en) | IGBT module parallel structure and power module structure | |
| CN203242471U (en) | Valve side winding wire outgoing structure of convertor transformer | |
| CN202652056U (en) | Bridgeless power factor correction converter | |
| CN203026330U (en) | Four-split transformer | |
| CN209297901U (en) | A kind of tractive transformer | |
| CN202034214U (en) | Support structure for on-load voltage-regulating switch tapping wires | |
| CN207909673U (en) | A kind of transformer changing from three phases to single phase | |
| CN202473566U (en) | 6kV-10kV dual-voltage conversion input dry type power distribution transformer | |
| CN203386580U (en) | Low-voltage lead wire structure of medium and small sized transformer | |
| CN202127324U (en) | Row-type junction box structure for low-voltage large-power motors | |
| CN201156463Y (en) | Wiring construction of secondary lateral of electric stove transformer | |
| CN204992568U (en) | Low -voltage arc suppressing coil | |
| CN203013472U (en) | Lead wire structure capable of meeting requirements of direct current resistance balance of split transformer | |
| CN212990882U (en) | Lead structure for reducing unbalance rate of direct current resistance of transformer | |
| CN201820606U (en) | Low-voltage Y wiring of triangular transformer | |
| CN202615996U (en) | Low-voltage lead wiring structure for distribution transformer | |
| CN203456255U (en) | Coil structure for traction-type transformer | |
| CN202839280U (en) | Scott transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20190523 |