CN113496809A - Vx of single-body structure connects 220kV traction transformer - Google Patents

Abstract

The invention discloses a single-body Vx-connected 220kV traction transformer, wherein an iron core adopts a two-phase four-column structure, two core columns in the middle are sleeved with coils, and two side columns at the outer side are only used as magnetic flux loops; the arrangement mode of the coils on each core column from the iron core to the outside is as follows: a low-voltage T coil, a low-voltage F coil, a high-voltage coil and a voltage regulating coil; the coil on one core column is wound on the left, the coil on the other core column is wound on the right, the voltage regulating coil adopts a cross-four-section intertwining continuous structure, a voltage regulating tap is led out from each four sections, and a layer of paper coil is added in a break-point oil passage of the coil; the transformer body structure is changed from two single-phase double-column structures into a two-phase four-column structure, so that the copper consumption of coils is reduced, and the occupied area of field installation of the transformer is reduced; the workload of each procedure is reduced, the product cost is reduced on the basis of ensuring the product performance, and the benefit of manufacturing enterprises is improved.

Description

Vx of single-body structure connects 220kV traction transformer

Technical Field

The invention relates to a manufacturing technology of a transformer, in particular to a single-body traction transformer with a Vx-220 kV connection structure.

Background

The traction transformer is used for supplying power to a railway traction line, the Vx-connected 220kV traction transformer is a transformer for changing three phases into two phases, the high-voltage side is three-phase incoming wire and has a voltage grade of 220kV, the low-voltage side is two-phase output (divided into two single phases, one phase is connected with a contact net T winding, the other phase is connected with a positive feeder F winding), and the voltage grade is 35 kV. At present, a domestic conventional Vx-220 kV traction transformer is generally composed of two single-phase traction transformers with the same capacity or different capacities. The body that every single-phase traction transformer corresponds all adopts single-phase twin columns iron core structure, and all overlaps on every iron core post and overlaps the coil. For the traction transformer with the structure, the coils of each transformer body are connected in series-parallel connection by leads, the number of lead-out heads is relatively large, and the lead-out heads occupy large space, so that the Vx wiring traction transformer with the coil structure is large in size, large in copper consumption, large in weight, high in cost and large in occupied area for field installation of the transformer.

Disclosure of Invention

Aiming at the defects of large volume, large copper consumption and the like of a daily Vx-220 kV traction transformer in the prior art, the invention aims to provide the Vx-220 kV traction transformer with a single body structure, which can reduce the weight of a copper wire of the transformer and the material consumption.

In order to solve the technical problems, the invention adopts the technical scheme that:

the invention relates to a single-body Vx-connected 220kV traction transformer, which comprises an iron core and coils, wherein the iron core adopts a two-phase four-column structure, the coils are sleeved on two middle core columns, and two side columns at the outer side are not sleeved with the coils and only serve as magnetic flux loops; the arrangement mode of the coils on each core column from the iron core to the outside is as follows: a low-voltage T coil, a low-voltage F coil, a high-voltage coil and a voltage regulating coil; the coil on one core column is wound on the left, and the coil on the other core column is wound on the right.

The pressure regulating coil adopts a cross-four-section intertwining continuous structure, a pressure regulating tap is led out from each four sections, and a layer of paper ring is added in a breakpoint oil duct of the coil.

The number of turns of each section of the voltage regulating coil is an integer, the position of the voltage regulating coil near the outlet end is changed, and meanwhile, a paper wrapping groove is added at a connecting line crossing four sections of knots.

Two core columns are respectively provided with an off-circuit tap changer, the off-circuit tap changers are arranged at the head ends of respective voltage regulating coils, wherein a minimum tap wiring terminal of the tap changer of the first core column is directly led out and connected to the high-voltage phase A sleeve, the other minimum tap wiring terminal is connected with the head end Ak of the high-voltage coil, one minimum tap wiring terminal of the tap changer of the second core column is directly led out and connected to the high-voltage phase C sleeve, and the other minimum tap wiring terminal is connected with the head end Bk of the high-voltage coil; the tail end A' of the high-voltage coil of the first core column is connected with the tail end B of the high-voltage coil of the second core column, and a high-voltage phase B sleeve is connected to realize high-voltage V connection; the coil heads of the two core column voltage regulating coils correspond to the access switch according to the head-outlet marks.

The low-voltage T windings and the low-voltage F windings of the two core columns are led out from the head ends and the tail ends of the two core columns and connected to corresponding low-voltage sleeves, wherein the low-voltage sleeves sleeved on low-voltage leads x1, a2, y1 and b2 are respectively grounded after being externally short-circuited, and the low-voltage sleeves sleeved on the low-voltage leads a1, x2, b1 and y2 form low-voltage x wiring; and after the low-voltage x wiring is connected with an external power system, two single-phase traction power supply circuits with loads are formed.

6. The single-body structure Vx-connected 220kV traction transformer according to claim 1, characterized in that: the high-voltage side B-phase high-voltage bushing is vertical to the box cover, and the A, C-phase high-voltage bushing is obliquely arranged towards the left side and the right side of the B-phase bushing; eight low-voltage bushings are led out from the low-voltage side, the bushings sleeved on the low-voltage leads a1 and x1, a2 and x2, b1 and y1, and b2 and y2 are arranged according to the insulation distance of 27.5kV of voltage, the bushings sleeved on the low-voltage leads x1 and a2, x2 and b1, and y1 and b2 are arranged according to the insulation distance of 55kV of voltage, and the low-voltage bushings are directly arranged on the box cover.

The invention has the following beneficial effects and advantages:

1. according to the invention, the structure of the transformer body is changed from two single-phase double-column structures to a two-phase four-column structure, so that the amount of copper used for coils is reduced, the structure is more compact, the product design cost is reduced, and the occupied area of the transformer in field installation is reduced; meanwhile, the workload of each process is reduced, and the manufacturing cost is reduced. The invention reduces the cost of the product and improves the benefit of manufacturing enterprises on the basis of ensuring the performance of the product.

2. The invention reduces the number of coils and the lead-out heads, so that the internal connection of the transformer body is simple, the space occupied by the lead-out wires is reduced, and the design cost is saved.

Drawings

FIG. 1 is a schematic structural diagram of a single-body Vx-220 kV traction transformer body;

FIG. 2 is a schematic diagram of a head-out transposition of a voltage-regulating coil according to the present invention;

FIG. 3 is a wiring schematic of the present invention;

FIG. 4 is a high voltage lead diagram of the present invention;

FIG. 5 is a low voltage lead diagram of the present invention;

FIG. 6 is a schematic diagram of the arrangement of a Vx-220 kV traction transformer bushing with a single body structure.

Wherein: the transformer comprises a low-voltage T coil 1, a low-voltage F coil 2, a high-voltage coil 3, a voltage regulating coil 4, a paper coil at an interruption point 5, a four-section entanglement connecting line 6 for voltage regulating, a high-voltage sleeve 7, a tap switch 8, a voltage regulating tap lead cable 9, a high-voltage lead cable 10, a low-voltage sleeve 11 and a low-voltage lead cable 12.

Detailed Description

The invention is further elucidated with reference to the accompanying drawings.

As shown in FIG. 1, the invention provides a single body Vx-220 kV traction transformer, which comprises an iron core and coils, wherein the iron core adopts a two-phase four-column structure, the coils are sleeved on two middle core columns, and two side columns at the outer side are only used as magnetic flux loops without being sleeved with the coils; the arrangement mode of the coils on each core column from the iron core to the outside is as follows: a low-voltage T coil, a low-voltage F coil, a high-voltage coil and a voltage regulating coil; the coil on one core column is wound on the left, and the coil on the other core column is wound on the right.

The coil capacities on the middle two legs (i.e. legs 1, 2 in fig. 1) may be the same or different. Two core columns are respectively provided with an off-circuit tap changer, and voltage adjustment is carried out by adopting a linkage operation mode.

As shown in figure 2, the single voltage regulating coil 4 is arranged, the voltage regulating coil 4 adopts a cross-four-section intertwining continuous structure according to the requirements of a lightning impulse electric field, a voltage regulating tap is led out from each four sections, and a layer of paper ring is added in oil passages of break points (2 and 3 tap positions) of the coil, so that the oil gap breakdown voltage at the break points can be improved, and the penetration breakdown among the break points is prevented; in order to facilitate winding of the coil, the number of turns of each section of the voltage regulating coil 4 is an integer, the position of the voltage regulating coil is changed near the head of the voltage regulating coil 4, and meanwhile, a paper wrapping groove is added at the position of a cross-four-section entanglement connecting line 6 to ensure the insulation strength.

As shown in figures 3-5, the tap switches of the two core columns are placed at the head ends of the coils to regulate the voltage. No. 9 tapping terminals of a column 1 tapping switch 8 are led out by a high-voltage lead cable 10 and connected with an A-phase high-voltage bushing 7, a No. 8 tapping terminal of the tapping switch is led out by the high-voltage lead cable to be connected with the head end Ak of a high-voltage coil 3, a No. 9 tapping terminal of a column 2 tapping switch is led out by the high-voltage lead cable to be connected with a C-phase high-voltage bushing, a No. 8 tapping terminal of the tapping switch is led out by the high-voltage lead cable to be connected with the head end Bk of the high-voltage coil 3, the tail end A' of the column 1 high-voltage coil is connected with the tail end B of the column 2 high-voltage coil together to be connected with a high-voltage B-phase bushing, and high-voltage V connection is achieved. Coil heads of the voltage regulating coils of the column 1 and the column 2 are correspondingly connected with the switch according to the head-outlet marks, so that the adjustment of each tapping voltage is realized.

The heads of the low-voltage T winding (traction wire winding) and the low-voltage F winding (positive feeder wire winding) of the post 1 and the post 2 are led out and connected into low-voltage sleeves of corresponding low-voltage lead-out wires a1, x1, a2, x2, b1, y1, b2 and y 2. The low-voltage bushings sleeved on the low-voltage leads x1, a2, y1 and b2 are respectively grounded after being externally short-circuited, and the low-voltage bushings sleeved on the low-voltage leads a1, x2, b1 and y2 form a low-voltage x wiring; and after the low-voltage x wiring is connected with an external power system, two single-phase traction power supply circuits with loads are formed.

As shown in fig. 6, the high-voltage side B-phase high-voltage bushing is installed perpendicular to the case cover, and the A, C-phase high-voltage bushing is installed obliquely to the left and right sides of the B-phase bushing. Eight low-voltage sleeves are led out from the low-voltage side, in order to reduce the size of the oil tank, the low-voltage sleeves sleeved on low-voltage leads a1 and x1, a2 and x2, b1 and y1 and b2 and y2 are arranged according to the insulation distance of 27.5kV of voltage, the low-voltage sleeves sleeved on low-voltage leads x1 and a2, x2 and b1 and y1 and b2 are arranged according to the insulation distance of 55kV of voltage, and the low-voltage sleeves are directly installed on a tank cover.

The invention uses technical software to calculate the wave process, mechanical force, temperature rise, overload and internal electric field of the product, and each technical parameter meets the requirement according to the verification result. Meanwhile, the structural form of the single transformer body reduces the copper consumption of the coil, reduces the size of the transformer body, reduces the complexity of design and process, reduces the workload of each process, greatly reduces the product cost to a certain extent, has a more compact structure, and reduces the occupied area of the field installation of the transformer.

Claims (6)

1. The utility model provides a Vx of list ware body structure connects 220kV traction transformer, includes iron core and coil, its characterized in that: the iron core adopts a two-phase four-column structure, coils are sleeved on two core columns in the middle, and two side columns on the outer side are only used as magnetic flux loops; the arrangement mode of the coils on each core column from the iron core to the outside is as follows: a low-voltage T coil, a low-voltage F coil, a high-voltage coil and a voltage regulating coil; the coil on one core column is wound on the left, and the coil on the other core column is wound on the right.

2. The single-body structure Vx-connected 220kV traction transformer according to claim 1, characterized in that: the pressure regulating coil adopts a cross-four-section intertwining continuous structure, a pressure regulating tap is led out from each four sections, and a layer of paper ring is added in a breakpoint oil duct of the coil.

3. The single-body structure Vx-connected 220kV traction transformer according to claim 2, wherein: the number of turns of each section of the voltage regulating coil is an integer, the position of the voltage regulating coil near the outlet end is changed, and meanwhile, a paper wrapping groove is added at a connecting line crossing four sections of knots.

4. The single-body structure Vx-connected 220kV traction transformer according to claim 1, characterized in that: two core columns are respectively provided with an off-circuit tap changer, the off-circuit tap changers are arranged at the head ends of respective voltage regulating coils, wherein a minimum tap wiring terminal of the tap changer of the first core column is directly led out and connected to the high-voltage phase A sleeve, the other minimum tap wiring terminal is connected with the head end Ak of the high-voltage coil, one minimum tap wiring terminal of the tap changer of the second core column is directly led out and connected to the high-voltage phase C sleeve, and the other minimum tap wiring terminal is connected with the head end Bk of the high-voltage coil; the tail end A' of the high-voltage coil of the first core column is connected with the tail end B of the high-voltage coil of the second core column, and a high-voltage phase B sleeve is connected to realize high-voltage V connection; the coil heads of the two core column voltage regulating coils correspond to the access switch according to the head-outlet marks.

5. The single-body structure Vx-connected 220kV traction transformer according to claim 1, characterized in that: the low-voltage T windings and the low-voltage F windings of the two core columns are led out from the head ends and the tail ends of the two core columns and connected to corresponding low-voltage sleeves, wherein the low-voltage sleeves sleeved on low-voltage leads x1, a2, y1 and b2 are respectively grounded after being externally short-circuited, and the low-voltage sleeves sleeved on the low-voltage leads a1, x2, b1 and y2 form low-voltage x wiring; and after the low-voltage x wiring is connected with an external power system, two single-phase traction power supply circuits with loads are formed.

6. The single-body structure Vx-connected 220kV traction transformer according to claim 1, characterized in that: the high-voltage side B-phase high-voltage bushing is vertical to the box cover, and the A, C-phase high-voltage bushing is obliquely arranged towards the left side and the right side of the B-phase bushing; eight low-voltage bushings are led out from the low-voltage side, the bushings sleeved on the low-voltage leads a1 and x1, a2 and x2, b1 and y1, and b2 and y2 are arranged according to the insulation distance of 27.5kV of voltage, the bushings sleeved on the low-voltage leads x1 and a2, x2 and b1, and y1 and b2 are arranged according to the insulation distance of 55kV of voltage, and the low-voltage bushings are directly arranged on the box cover.

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