CN213635640U - Low-voltage high-current transformer with parallel split outgoing lines - Google Patents
Low-voltage high-current transformer with parallel split outgoing lines Download PDFInfo
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- CN213635640U CN213635640U CN202021596010.3U CN202021596010U CN213635640U CN 213635640 U CN213635640 U CN 213635640U CN 202021596010 U CN202021596010 U CN 202021596010U CN 213635640 U CN213635640 U CN 213635640U
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Abstract
A low-voltage heavy-current transformer with parallel split outgoing lines is characterized in that a low-voltage winding adopts in-phase inverse parallel outgoing lines and comprises two outgoing line branches of an A phase, a B phase and a C phase; the low-voltage outlet copper bar comprises two outlet ends of an A phase, a B phase and a C phase; the low-voltage outlet copper bar is an upper outlet copper bar and a lower outlet copper bar, and the outlet ends of A, B and the C-phase are split into two rows of terminals which are respectively arranged on the upper outlet copper bar and the lower outlet copper bar and respectively form in-phase inverse parallel connection; when the low-voltage winding is in a delta connection method or a star connection method, the alternate connection copper bars or the neutral point connection copper bars are arranged between the upper outlet copper bar and the lower outlet copper bar to form a vertically symmetrical structure. The low-voltage high-current transformer reduces the current of the outgoing copper bar and the electric field and the magnetic field intensity in the unit area around the outgoing copper bar, weakens the induced eddy current inside the copper bar and the surrounding iron and inside the transformer oil tank, effectively reduces the heating and oil leakage of the outgoing copper bar, reduces the stray loss of the transformer, and improves the efficiency and the operation safety and reliability of the transformer.
Description
Technical Field
The utility model relates to a transformer, concretely relates to parallelly connected split outlet's low pressure heavy current transformer.
Background
The rectifier transformer is one of the most important devices in a high-power rectifier device, the high-power rectifier transformer belongs to a large-current transformer (secondary output voltage is not high, but secondary output current is large, generally about 100 kA), and when a low-voltage side winding of the large-current transformer adopts a delta connection method, a low-voltage outgoing line of the large-current transformer generally adopts the following mode:
1. non-in-phase inverse parallel connection of 3 rows and 2 lines of outgoing lines is adopted (the low-voltage outgoing line copper bar comprises a1 st row copper bar 53, a2 nd row copper bar 54 and a3 rd row copper bar 55, see attached figures 4-6);
2. the same-phase inverse parallel connection is adopted to concentrate a row of outgoing lines (the low-voltage outgoing line copper bar is a concentrated outgoing line copper bar, see the attached figures 7-9).
The first scheme has the following defects: (1) the non-in-phase inverse parallel connection 3 rows 2 line-out lines can not counteract the magnetic field between the copper bars although the magnetic field of the outgoing line copper bars is not concentrated, and the large-current alternating magnetic field induces eddy current in the transformer oil tank and the iron fixing piece around the outgoing line copper bars, so that the transformer oil tank and the iron fixing piece are heated; (2) the connection group of the low-voltage winding of the large-current transformer is generally in a delta connection method, the structure of a low-voltage lead of a line is complicated by adopting 3 rows and 2 columns, and the fault rate of the transformer is high;
the second scheme has the following defects: (1) the current-carrying capacity of a single copper bar is large, the heat generated by the copper bar is large, and the aging and oil leakage of the sealant of the copper bar are easily caused; (2) although the same-phase inverse parallel technology is adopted for outgoing, the outgoing lines are concentrated, the sectional area of a copper bar is large, the skin effect is serious, the heavy-current low-voltage outgoing lines are concentrated, the magnetic field intensity around the copper bar is still large, and a transformer oil tank generates heat to a certain extent: (3) the low voltage is not good in symmetry of alternate continuous row current paths by adopting a triangular connection method, the heating of the copper bar is unbalanced, and the local overheating of the current-carrying copper bar is caused.
In addition, the first scheme and the second scheme are asymmetrical in the interphase connecting copper bar I, so that the current path of the copper bar is asymmetrical, and the heat of the copper bar is unbalanced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low pressure heavy current transformer that divides in parallel to be qualified for the next round of competitions to overcome the above-mentioned not enough that prior art exists.
For solving the above technical problem, the utility model discloses the technical scheme who takes is:
a low-voltage high-current transformer with parallel split-out lines adopts in-phase inverse parallel outgoing lines for low-voltage windings, and comprises an outgoing line branch La1 and an outgoing line branch La2 of an A phase, an outgoing line branch Lb1 and an outgoing line branch Lb2 of a B phase, and an outgoing line branch Lc1 and an outgoing line branch Lc2 of a C phase;
the low-voltage outlet copper bar comprises an outlet end A1 and an outlet end A2 of the phase A, an outlet end B1 and an outlet end B2 of the phase B, and an outlet end C1 and an outlet end C2 of the phase C;
the low-voltage outgoing line copper bar is an upper outgoing line copper bar and a lower outgoing line copper bar, the outgoing line ends of the A phase, the B phase and the C phase are respectively split into two rows of terminal outgoing lines, one row of terminal outgoing lines are arranged on the upper outgoing line copper bar, one row of terminal outgoing lines are arranged on the lower outgoing line copper bar, and the upper outgoing line copper bar and the lower outgoing line copper bar are respectively in inverse parallel connection with each other, namely:
an outgoing line end A1 of the A phase is split into a terminal a1 and a terminal A3 outgoing line, an outgoing line end A2 is split into a terminal a2 and a terminal a4 outgoing line, wherein a terminal A3 and a terminal a4 are arranged on an upper outgoing line copper bar, the current flow directions of the terminals are opposite, the same phase and inverse parallel connection is formed, a terminal a1 and a terminal a2 are arranged on a lower outgoing line copper bar, the current flow directions of the terminals are opposite, the same phase and inverse parallel connection is formed, the terminal a1 and the terminal A3 are equipotential, and the terminal a2 and the terminal a4 are equipotential;
an outgoing line end B1 of the B phase is split into a terminal B1 and a terminal B3 outgoing line, an outgoing line end B2 is split into a terminal B2 and a terminal B4 outgoing line, wherein a terminal B3 and a terminal B4 are arranged on an upper outgoing line copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, a terminal B1 and a terminal B2 are arranged on a lower outgoing line copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, the terminal B1 and the terminal B3 are equipotential, and the terminal B2 and the terminal B4 are equipotential;
an outlet end C1 of the C phase is split into a terminal C1 and a terminal C3 for outlet, an outlet end C2 is split into a terminal C2 and a terminal C4 for outlet, wherein a terminal C3 and a terminal C4 are arranged on an upper outlet copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, a terminal C1 and a terminal C2 are arranged on a lower outlet copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, the terminal C1 and the terminal C3 are equipotential, and the terminal C2 and the terminal C4 are equipotential.
The further technical scheme is as follows: when the transformer low-voltage winding is in a delta connection method, the interphase connection copper bars are arranged between the upper and lower outlet copper bars to form a symmetrical structure with equal current-carrying capacity of the upper and lower copper bars; when the transformer low-voltage winding is in star connection, the neutral point connecting copper bar is arranged between the upper and lower outlet copper bars to form a symmetrical structure with equal current-carrying capacity of the upper and lower copper bars.
Due to the adoption of the technical scheme, compare with prior art, the utility model relates to a low pressure heavy current transformer that parallelly connected split outlet has following beneficial effect:
1. because the low-voltage winding adopts the cophase inverse parallel outgoing line, the electric field and the magnetic field of partial heavy-current outgoing line copper bars can be offset, the low-voltage outgoing line copper bars are split into the upper outgoing line copper bar and the lower outgoing line copper bar, one row is above and one row is below, the upper outgoing line copper bar and the lower outgoing line copper bar respectively form the cophase inverse parallel connection, the upper outgoing line copper bar and the lower outgoing line copper bar are separated in space, the current-carrying capacity is evenly divided up and down, and the current of the single outgoing line copper bar can be reduced, so that the electric field and the magnetic field intensity in the unit area around the outgoing line copper bars are reduced, the reduction of the magnetic field intensity is reduced, the induced eddy current in the conductive materials such as iron and the like around the copper;
2. the low-voltage outlet copper bar is split into the upper outlet copper bar and the lower outlet copper bar, so that the concentrated outlet of the heavy-current copper bar is avoided, and the phenomenon that the sealant of the copper bar is aged and leaks oil due to the large current-carrying capacity of a single outlet copper bar can be avoided;
3. because the concentrated outgoing line is avoided, the skin effect of the outgoing line copper bar can be weakened, and the heating of the transformer oil tank caused by the magnetic field intensity around the outgoing line copper bar is reduced:
4. because the low-voltage winding is when triangle-shaped connection or star connection, alternate connection copper bar or neutral point connection copper bar arrange in the middle of the copper bar of being qualified for the next round of competitions about, form the symmetrical structure that upper and lower copper bar current-carrying capacity equals, improved the symmetry of alternate connection copper bar current path, make the copper bar generate heat the equilibrium, avoid the local overheat of cross of current-carrying copper bar.
The technical features of a low-voltage high-current transformer with parallel split lines according to the present invention will be further described with reference to the accompanying drawings and embodiments.
Drawings
Fig. 1-2 are the utility model relates to a low pressure heavy current transformer that parallelly connected split was qualified for the next round of competitions structure sketch map and the wiring schematic diagram of being qualified for the next round of competitions:
FIG. 1 is a front view (the low voltage outgoing copper bar is distributed on the outgoing line of one side of the transformer oil tank);
FIG. 2 is a left side view of FIG. 1 (with arrows indicating the direction of current flow);
FIG. 3 is a schematic diagram of the wiring of the in-phase and anti-parallel split outlet;
fig. 4 to fig. 6 are schematic diagrams of a line-out structure and a line-out wiring schematic diagram of a conventional low-voltage large-current transformer adopting in-phase inverse parallel connection 3 rows 2:
FIG. 4 is a line-out profile of row 3, row 2, with the copper bars listed on the transformer tank;
FIG. 4 is a front view (the low voltage outlet copper bar is distributed on the outlet of one side of the transformer tank);
FIG. 5 is a left side view of FIG. 4 (with arrows indicating the direction of current flow);
FIG. 6 is a schematic diagram of the wiring of a non-in-phase reverse parallel split outlet;
fig. 7 to 9 are a schematic diagram of a structure and a wiring schematic diagram of a low-voltage large-current transformer adopting in-phase inverse parallel centralization of one row of outgoing lines:
FIG. 7 is a front view (the distribution of the low-voltage outgoing copper bars on one side of the transformer tank);
FIG. 8 is a left side view of FIG. 7 (with arrows indicating the direction of current flow);
FIG. 9 is a schematic diagram of the wiring of the in-phase anti-parallel outgoing lines (the outgoing lines are not split);
in the figure:
1-transformer oil tank, 2-low voltage coil, 3-copper bar and coil connecting line, 4-iron plate, 5-low voltage outlet copper bar, 51-upper outlet copper bar, 52-lower outlet copper bar, 53-1 st row of copper bar, 54-2 nd row of copper bar, 55-3 rd row of copper bar, 56-concentrated outlet copper bar, 6-interphase connection copper bar (or neutral point connection copper bar), 7-interphase connection copper bar I, i-current (arrow indicates the direction of current).
Detailed Description
A low-voltage high-current transformer with parallel split-out lines adopts in-phase inverse parallel outgoing lines for low-voltage windings, and comprises an outgoing line branch La1 and an outgoing line branch La2 of an A phase, an outgoing line branch Lb1 and an outgoing line branch Lb2 of a B phase, and an outgoing line branch Lc1 and an outgoing line branch Lc2 of a C phase; the low-voltage outlet copper bar comprises an outlet end A1 and an outlet end A2 of the phase A, an outlet end B1 and an outlet end B2 of the phase B, and an outlet end C1 and an outlet end C2 of the phase C;
the low-voltage outgoing line copper bar is an upper copper bar and a lower copper bar and comprises an upper outgoing line copper bar and a lower outgoing line copper bar, the line outgoing ends of the A phase, the B phase and the C phase are respectively split into two rows of terminal outgoing lines, one row of terminal outgoing lines are arranged on the upper outgoing line copper bar, the other row of terminal outgoing lines are arranged on the lower outgoing line copper bar, and the upper outgoing line copper bar and the lower outgoing line copper bar are respectively formed in the same phase:
an outgoing line end A1 of the A phase is split into a terminal a1 and a terminal A3 outgoing line, an outgoing line end A2 is split into a terminal a2 and a terminal a4 outgoing line, wherein a terminal A3 and a terminal a4 are arranged on an upper outgoing line copper bar, the current flow directions of the terminals are opposite, the same phase and inverse parallel connection is formed, a terminal a1 and a terminal a2 are arranged on a lower outgoing line copper bar, the current flow directions of the terminals are opposite, the same phase and inverse parallel connection is formed, the terminal a1 and the terminal A3 are equipotential, and the terminal a2 and the terminal a4 are equipotential;
an outgoing line end B1 of the B phase is split into a terminal B1 and a terminal B3 outgoing line, an outgoing line end B2 is split into a terminal B2 and a terminal B4 outgoing line, wherein a terminal B3 and a terminal B4 are arranged on an upper outgoing line copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, a terminal B1 and a terminal B2 are arranged on a lower outgoing line copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, the terminal B1 and the terminal B3 are equipotential, and the terminal B2 and the terminal B4 are equipotential;
an outlet end C1 of the C phase is split into a terminal C1 and a terminal C3 for outlet, an outlet end C2 is split into a terminal C2 and a terminal C4 for outlet, wherein a terminal C3 and a terminal C4 are arranged on an upper outlet copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, a terminal C1 and a terminal C2 are arranged on a lower outlet copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, the terminal C1 and the terminal C3 are equipotential, and the terminal C2 and the terminal C4 are equipotential.
When the transformer low-voltage winding is in a delta connection method, the interphase connection copper bars are arranged between the upper and lower outgoing copper bars to form a symmetrical structure with the same current-carrying capacity of the upper and lower copper bars, and when the transformer low-voltage winding is in a star connection method, the neutral point connection copper bars are arranged between the upper and lower outgoing copper bars to form a symmetrical structure with the same current-carrying capacity of the upper and lower copper bars, so that the symmetry of the current path of the interphase connection copper bars is improved, the copper bars are balanced in heating, and the current-carrying copper bars are prevented from being overheated locally.
Claims (2)
1. A low-voltage high-current transformer with parallel split-out lines adopts in-phase inverse parallel outgoing lines for low-voltage windings, and comprises an outgoing line branch La1 and an outgoing line branch La2 of an A phase, an outgoing line branch Lb1 and an outgoing line branch Lb2 of a B phase, and an outgoing line branch Lc1 and an outgoing line branch Lc2 of a C phase;
the low-voltage outlet copper bar comprises an outlet end A1 and an outlet end A2 of the phase A, an outlet end B1 and an outlet end B2 of the phase B, and an outlet end C1 and an outlet end C2 of the phase C;
the method is characterized in that:
the low-voltage outgoing line copper bar is an upper outgoing line copper bar and a lower outgoing line copper bar, the outgoing line ends of the A phase, the B phase and the C phase are respectively split into two rows of terminal outgoing lines, one row of terminal outgoing lines are arranged on the upper outgoing line copper bar, one row of terminal outgoing lines are arranged on the lower outgoing line copper bar, and the upper outgoing line copper bar and the lower outgoing line copper bar are respectively in inverse parallel connection with each other, namely:
an outgoing line end A1 of the A phase is split into a terminal a1 and a terminal A3 outgoing line, an outgoing line end A2 is split into a terminal a2 and a terminal a4 outgoing line, wherein a terminal A3 and a terminal a4 are arranged on an upper outgoing line copper bar, the current flow directions of the terminals are opposite, the same phase and inverse parallel connection is formed, a terminal a1 and a terminal a2 are arranged on a lower outgoing line copper bar, the current flow directions of the terminals are opposite, the same phase and inverse parallel connection is formed, the terminal a1 and the terminal A3 are equipotential, and the terminal a2 and the terminal a4 are equipotential;
an outgoing line end B1 of the B phase is split into a terminal B1 and a terminal B3 outgoing line, an outgoing line end B2 is split into a terminal B2 and a terminal B4 outgoing line, wherein a terminal B3 and a terminal B4 are arranged on an upper outgoing line copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, a terminal B1 and a terminal B2 are arranged on a lower outgoing line copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, the terminal B1 and the terminal B3 are equipotential, and the terminal B2 and the terminal B4 are equipotential;
an outlet end C1 of the C phase is split into a terminal C1 and a terminal C3 for outlet, an outlet end C2 is split into a terminal C2 and a terminal C4 for outlet, wherein a terminal C3 and a terminal C4 are arranged on an upper outlet copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, a terminal C1 and a terminal C2 are arranged on a lower outlet copper bar, the current flow directions of the terminals are opposite, the same-phase inverse parallel connection is formed, the terminal C1 and the terminal C3 are equipotential, and the terminal C2 and the terminal C4 are equipotential.
2. The low-voltage high-current transformer with the parallel split-lines as claimed in claim 1, wherein: when the transformer low-voltage winding is in a delta connection method, the interphase connection copper bars are arranged between the upper and lower outlet copper bars to form a symmetrical structure with equal current-carrying capacity of the upper and lower copper bars; when the transformer low-voltage winding is in star connection, the neutral point connecting copper bar is arranged between the upper and lower outlet copper bars to form a symmetrical structure with equal current-carrying capacity of the upper and lower copper bars.
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| CN202021596010.3U CN213635640U (en) | 2020-08-04 | 2020-08-04 | Low-voltage high-current transformer with parallel split outgoing lines |
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| CN202021596010.3U CN213635640U (en) | 2020-08-04 | 2020-08-04 | Low-voltage high-current transformer with parallel split outgoing lines |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611497A (en) * | 2021-07-23 | 2021-11-05 | 深圳供电局有限公司 | 220kV transformer low-voltage side double-branch outgoing line structure and method |
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- 2020-08-04 CN CN202021596010.3U patent/CN213635640U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611497A (en) * | 2021-07-23 | 2021-11-05 | 深圳供电局有限公司 | 220kV transformer low-voltage side double-branch outgoing line structure and method |
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