CN212990882U - Lead structure for reducing unbalance rate of direct current resistance of transformer - Google Patents
Lead structure for reducing unbalance rate of direct current resistance of transformer Download PDFInfo
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- CN212990882U CN212990882U CN202022362246.7U CN202022362246U CN212990882U CN 212990882 U CN212990882 U CN 212990882U CN 202022362246 U CN202022362246 U CN 202022362246U CN 212990882 U CN212990882 U CN 212990882U
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Abstract
The utility model relates to a reduce lead wire structure of transformer direct current resistance unbalance rate belongs to the experimental technical field of transformer. The technical scheme is as follows: a, B, C three-phase coil leads are respectively led out through corresponding coil head leading-out copper bars and coil tail leading-out copper bars, A, B, C three-phase coil tail leading-out copper bars are sequentially connected through neutral point copper bars, and then A, C phase coil tail leading-out copper bars are connected through bridging copper bars, so that a triangular connection structure of the three-phase coil tail is formed, and the assembly of the low-voltage lead of the transformer is completed. The utility model discloses at A, C parallelly connected increase a bridging copper bar of looks coil neutral point copper bar junction, can effectively reduce the line resistance unbalance rate of transformer, guarantee transformer operation safety, can reduce the coil head and draw forth the sectional area that copper bar and neutral point copper bar were drawn forth to copper bar, coil tail, reduce the manufacturing cost of product, still reduced the coil copper bar and drawn forth and the degree of difficulty of assembly, improved work efficiency.
Description
Technical Field
The utility model relates to a reduce lead wire structure of transformer direct current resistance unbalance rate belongs to the experimental technical field of transformer.
Background
The direct-current resistance measurement of the three-phase transformer is one of basic items of transformer delivery, handover and preventive tests, and is an important performance parameter in transformer experiments. The unbalance rate of the direct current resistance of the transformer is an important basis for whether the product quality is qualified or not. According to the GB/T10228 technical parameters and requirements of dry type power transformers, the winding direct current resistance unbalance rate of the distribution transformer is 2500kVA or below: the line is not more than 2%. For the transformer with the yn connection structure on the low-voltage side, the line resistance of the transformer needs to be measured at the position of a lead led out from a coil, when the capacity of the transformer is increased, the current in the low-voltage coil of the transformer is increased, the resistance of the coil is reduced, and the influence of the lead resistance on the resistance value of the line resistance is increased. Due to the structural characteristics of yn connection, the influence of the resistance value of the neutral point copper bar on the line resistance unbalance rate is large, and the line resistance unbalance rate is caused to exceed the standard. The unbalance of the direct-current resistance of the transformer can cause the transformer to have circulating current between phases or between phases and the ground, increase the additional loss of the transformer and even cause the asymmetric operation of the transformer to cause accidents.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reduce lead wire structure of transformer direct current resistance unbalance rate increases a bridging copper bar lead wire between the A, C double-phase link of transformer, can reduce the line resistance unbalance rate of transformer, has solved the problem that exists among the background art.
The technical scheme of the utility model is that:
a lead structure for reducing the unbalance rate of direct current resistance of a transformer comprises an A-phase coil lead, an A-phase coil head leading-out copper bar, an A-phase coil tail leading-out copper bar, a B-phase coil lead, a B-phase coil head leading-out copper bar, a B-phase coil tail leading-out copper bar, a C-phase coil lead, a C-phase coil head leading-out copper bar, a C-phase coil tail leading-out copper bar, a neutral point copper bar and a bridging copper bar, wherein the A-phase coil lead, the B-phase coil lead and the C-phase coil lead are sequentially arranged, and the head end and the tail end of the A-phase coil lead are respectively connected with one end of the A-phase coil head leading-out copper bar and one end of; the head end and the tail end of the B-phase coil lead are respectively connected with one end of a B-phase coil head leading-out copper bar and a B-phase coil tail leading-out copper bar; the head end and the tail end of the C-phase coil lead are respectively connected with one end of a C-phase coil head leading-out copper bar and a C-phase coil tail leading-out copper bar; the copper bar is drawn forth to A looks coil tail, the other end that copper bar and C looks coil tail were drawn forth to B looks coil tail is drawn forth the copper bar and is connected gradually through the neutral point copper bar, the other end that copper bar and C looks coil tail were drawn forth to A looks coil tail is drawn forth the copper bar and is connected through the bridging copper bar, form the triangle-shaped connection structure of three looks coil tail, triangle-shaped connection structure is connected with the one end of direct current resistance measuring apparatu, the copper bar is drawn forth to A looks coil head, the other end that copper bar and C looks coil head were drawn forth to B looks coil head is connected with the other end of direct current resistance measuring apparatu respectively.
And the neutral point copper bar and the bridging copper bar are respectively arranged on two sides of the other end of the A-phase coil tail leading-out copper bar and the C-phase coil tail leading-out copper bar.
A, B, C three-phase coil leads are respectively led out through corresponding coil head leading-out copper bars and coil tail leading-out copper bars, A, B, C three-phase coil tail leading-out copper bars are sequentially connected through neutral point copper bars, and then A, C phase coil tail leading-out copper bars are connected through bridging copper bars, so that a triangular connection structure of the three-phase coil tail is formed, and the assembly of the low-voltage lead of the transformer is completed.
When a three-phase transformer direct-current resistance measurement test is carried out, one end of a direct-current resistance measurement instrument is connected with the triangular connection structure, the other end of the direct-current resistance measurement instrument is respectively connected with the other ends of the A-phase coil head leading-out copper bar, the B-phase coil head leading-out copper bar and the C-phase coil head leading-out copper bar, and test data are recorded in sequence.
The utility model has the advantages that: a bridging copper bar is additionally arranged at the joint of the A, C phase coil neutral point copper bars in parallel, so that the line resistance between the A, C phase coils can be effectively reduced, the line resistance unbalance rate of the transformer is reduced, and the operation safety of the transformer is ensured. The line resistance unbalance rate is reduced by adding the bridging copper bar with a smaller sectional area, the sectional areas of the coil head leading-out copper bar, the coil tail leading-out copper bar and the neutral point copper bar can be reduced, the using amount of the copper bar is reduced, the production cost of a product is reduced, the difficulty of leading-out and assembling of the coil copper bar is reduced, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic side view of the present invention;
in the figure: the transformer comprises an A-phase coil lead 11, an A-phase coil head leading-out copper bar 12, an A-phase coil tail leading-out copper bar 13, a B-phase coil lead 21, a B-phase coil head leading-out copper bar 22, a B-phase coil tail leading-out copper bar 23, a C-phase coil lead 31, a C-phase coil head leading-out copper bar 32, a C-phase coil tail leading-out copper bar 33, a neutral point copper bar 4 and a bridging copper bar 5.
Detailed Description
The present invention will be further described with reference to the accompanying drawings by way of examples.
A lead structure for reducing the unbalance rate of direct current resistance of a transformer comprises an A-phase coil lead 11, an A-phase coil head leading-out copper bar 12, an A-phase coil tail leading-out copper bar 13, a B-phase coil lead 21, a B-phase coil head leading-out copper bar 22, a B-phase coil tail leading-out copper bar 23, a C-phase coil lead 31, a C-phase coil head leading-out copper bar 32, a C-phase coil tail leading-out copper bar 33, a neutral point copper bar 4 and a bridging copper bar 5, wherein the A-phase coil lead 11, the B-phase coil lead 21 and the C-phase coil lead 31 are sequentially arranged, and the head end and the tail end of the A-phase coil lead 11 are respectively connected with one end of the A-phase coil head leading-out copper bar 12 and one end of; the head end and the tail end of the B-phase coil lead 21 are respectively connected with one end of a B-phase coil head leading-out copper bar 22 and a B-phase coil tail leading-out copper bar 23; the head end and the tail end of the C-phase coil lead 31 are respectively connected with one end of a C-phase coil head leading-out copper bar 32 and a C-phase coil tail leading-out copper bar 33; the A-phase coil tail end leading-out copper bar 13, the B-phase coil tail end leading-out copper bar 23 and the C-phase coil tail end leading-out copper bar 33 are sequentially connected through a neutral point copper bar 4, the A-phase coil tail end leading-out copper bar 13 and the C-phase coil tail end leading-out copper bar 33 are connected through a bridging copper bar 5, a triangular connection structure of the three-phase coil tail end is formed, the triangular connection structure is connected with one end of a direct current resistance measuring instrument, the A-phase coil head leading-out copper bar 12, the B-phase coil head leading-out copper bar 22 and the C-phase coil head leading-out copper bar 32 are respectively connected with the other end of the direct current resistance measuring instrument.
The neutral point copper bar 4 and the bridging copper bar 5 are respectively arranged on two sides of the other end of the A-phase coil tail leading-out copper bar 13 and the C-phase coil tail leading-out copper bar 33.
In this embodiment, after A, B, C three-phase coil leads are respectively led out through the corresponding coil head leading-out copper bars and the corresponding coil tail leading-out copper bars, the A, B, C three-phase coil tail leading-out copper bars are sequentially connected through the neutral point copper bars 4, and then the A, C phase coil tail leading-out copper bars are connected through the bridging copper bars, so that a triangular connection structure of the three-phase coil tail is formed, and the assembly of the transformer low-voltage lead is completed.
When a three-phase transformer direct-current resistance measurement test is carried out, one end of a direct-current resistance measuring instrument is connected with the triangular connection structure, the other end of the direct-current resistance measuring instrument is respectively connected with the other ends of the A-phase coil head leading-out copper bar 12, the B-phase coil head leading-out copper bar 22 and the C-phase coil head leading-out copper bar 32, and test data are recorded in sequence.
The utility model discloses connect in parallel and increase a bridging copper bar in A, C looks coil neutral point copper bar junction, can effectively reduce the line resistance between A, C looks coil to reduce the line resistance unbalance rate of transformer, guarantee transformer operation safety. The line resistance unbalance rate is reduced by adding the bridging copper bar with a smaller sectional area, the sectional areas of the coil head leading-out copper bar, the coil tail leading-out copper bar and the neutral point copper bar can be reduced, and the production cost of the product is reduced.
Claims (2)
1. The utility model provides a reduce lead wire structure of transformer direct current resistance unbalance rate which characterized in that: the transformer comprises an A-phase coil lead (11), an A-phase coil head leading-out copper bar (12), an A-phase coil tail leading-out copper bar (13), a B-phase coil lead (21), a B-phase coil head leading-out copper bar (22), a B-phase coil tail leading-out copper bar (23), a C-phase coil lead (31), a C-phase coil head leading-out copper bar (32), a C-phase coil tail leading-out copper bar (33), a neutral point copper bar (4) and a bridging copper bar (5), wherein the A-phase coil lead (11), the B-phase coil lead (21) and the C-phase coil lead (31) are sequentially arranged, and the head end and the tail end of the A-phase coil lead (11) are respectively connected with one end of the A-phase coil head leading-out copper bar (12) and the A-phase coil tail; the head end and the tail end of the B-phase coil lead (21) are respectively connected with one end of a B-phase coil head leading-out copper bar (22) and a B-phase coil tail leading-out copper bar (23); the head end and the tail end of the C-phase coil lead (31) are respectively connected with one end of a C-phase coil head leading-out copper bar (32) and a C-phase coil tail leading-out copper bar (33); the other end of the A-phase coil tail leading-out copper bar (13), the B-phase coil tail leading-out copper bar (23) and the C-phase coil tail leading-out copper bar (33) are sequentially connected through a neutral point copper bar (4), the other end of the A-phase coil tail leading-out copper bar (13) and the other end of the C-phase coil tail leading-out copper bar (33) are connected through a bridging copper bar (5), a triangular connection structure of the three-phase coil tail is formed, the triangular connection structure is connected with one end of a direct current resistance measuring instrument, the A-phase coil head leading-out copper bar (12), the B-phase coil head leading-out copper bar (22) and the C-phase coil head leading-out copper bar (32) are respectively connected with the other end of the direct.
2. The lead structure for reducing the unbalance rate of the direct current resistance of the transformer according to claim 1, wherein: the neutral point copper bar (4) and the bridging copper bar (5) are respectively arranged on two sides of the other end of the A-phase coil tail leading-out copper bar (13) and the C-phase coil tail leading-out copper bar (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022362246.7U CN212990882U (en) | 2020-10-22 | 2020-10-22 | Lead structure for reducing unbalance rate of direct current resistance of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022362246.7U CN212990882U (en) | 2020-10-22 | 2020-10-22 | Lead structure for reducing unbalance rate of direct current resistance of transformer |
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| Publication Number | Publication Date |
|---|---|
| CN212990882U true CN212990882U (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022362246.7U Active CN212990882U (en) | 2020-10-22 | 2020-10-22 | Lead structure for reducing unbalance rate of direct current resistance of transformer |
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| Country | Link |
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| CN (1) | CN212990882U (en) |
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- 2020-10-22 CN CN202022362246.7U patent/CN212990882U/en active Active
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