On-load voltage regulation high-voltage coil

Abstract

The utility model discloses an on-load voltage regulation high-voltage coil, and relates to the technical field of transformer equipment, the high-voltage coil comprises a high-voltage coil basic section and a voltage regulation section which are wound on the same hard paper tube, the voltage regulation section is positioned at the middle lower part of the high-voltage coil, and the voltage regulation section comprises a plurality of double-cake wire cakes which are distributed along the axial direction of the high-voltage coil; each double-cake wire cake comprises a plurality of tapping sections, and a plurality of tapping taps are led out, so that the problems that in the prior art, an independent voltage regulating coil is needed to realize voltage regulation, and the size of the transformer is increased; as the axial height of the voltage regulating coil is smaller than that of the high-voltage coil, an insulating part needs to be used for filling, so that the filling rate of an iron core window is low, and the production cost of the transformer is increased; the voltage regulating coil needs to be independently wound by a special winding former and an independent hard paper tube and needs to be independently sleeved when the transformer body is assembled, so that the labor, time and production cost required by the production of the transformer are increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer equipment, and particularly relates to a high-voltage coil for on-load voltage regulation. Background Art

[0002] The on-load voltage regulation range of 110kV transformer is usually ±8×1.25%, and the 8 voltage regulation sections are set as independent cylindrical or spiral voltage regulation coils, such as Figure 1 As shown, the arrangement of coils on each core column is low-voltage coil-high-voltage coil-voltage regulating coil from the inside to the outside. This design has the following disadvantages:

[0003] 1: Due to the independent existence of the voltage-regulating coil, the size of the transformer becomes larger; 2: Since the axial height of the voltage-regulating coil is smaller than the axial height of the high-voltage coil, there is a height difference between the voltage-regulating coil and the high-voltage coil, which needs to be filled with insulating parts, reducing the filling rate of the core window and increasing the cost required for the company to produce the transformer; 3: When producing the voltage-regulating coil, it is necessary to make a special winding mold and an independent cardboard tube for winding separately, and when assembling the transformer body, the voltage-regulating coil needs to be separately assembled, which increases the labor, time and production cost required for transformer production. Utility Model Content

[0004] The purpose of the utility model is to provide a high-voltage coil for on-load voltage regulation, so as to overcome the technical problems in the prior art that an independent voltage-regulating coil is required to achieve voltage regulation, resulting in a larger transformer volume; because the axial height of the voltage-regulating coil is less than the axial height of the high-voltage coil, it needs to be filled with insulating parts, resulting in a low filling rate of the core window and an increase in the cost required for transformer production; because the voltage-regulating coil needs to be made into a special winding mold and an independent cardboard tube for winding separately, and needs to be separately assembled when the transformer body is assembled, the labor, time and production cost required for transformer production increase. The specific technical solution is as follows:

[0005] A high-voltage coil with on-load voltage regulation, the high-voltage coil comprising a high-voltage coil basic section and a voltage regulation section;

[0006] The high-voltage coil basic section and the voltage regulating section are both wound on the same cardboard tube, and the voltage regulating section is arranged in the axial direction of the high-voltage coil and located in the middle and lower part of the high-voltage coil;

[0007] The voltage regulating section includes a plurality of double-pie coils wound along the axial direction of the high-voltage coil, and the parallel-wound conductors in each of the double-pie coils are not transposed;

[0008] A plurality of taps for voltage regulation are led out from each of the double-coil coils.

[0009] Preferably, the voltage regulating section comprises two double-cake coils wound and distributed along the axial direction of the high-voltage coil, each of the double-cake coils serves as four tapping sections and leads out tapping points for voltage regulation;

[0010] The double-coil coil is formed by winding four wires in parallel, including a positive winding coil and a reverse winding coil, and the parallel-wound wires of the positive winding coil and the reverse winding coil are not transposed.

[0011] Preferably, the number of turns of the high-voltage coil basic section is defined as M, and the number of turns of the positive winding coil and the reverse winding coil are both W, then W≤int(M / 2) is satisfied, wherein int() represents a rounding function.

[0012] Compared with the existing technology, the utility model has the following beneficial effects:

[0013] The utility model provides a high-voltage coil for on-load voltage regulation. The on-load voltage regulation high-voltage coil is provided with a voltage regulation section composed of a plurality of double-cake coils between the basic sections of the high-voltage coil. Each double-cake coil includes a plurality of branch sections, and a plurality of circuits are led out to replace the independently existing regulating coil. The problem that the independently existing voltage regulation coil is required to realize voltage regulation in the prior art causes the transformer volume to become larger. Since the axial height of the voltage regulation coil is smaller than the axial height of the high-voltage coil, it needs to be filled with insulating parts, resulting in a low filling rate of the core window and an increase in the cost required for transformer production. Since the voltage regulation coil needs to be made into a special winding die and an independent cardboard tube for winding separately and needs to be separately assembled when the transformer body is assembled, the labor, time and production cost required for transformer production are increased. At the same time, the utility model reduces the overall volume of the core column, and correspondingly reduces the no-load loss, no-load current and the volume of the oil tank and the transformer, that is, improves the production efficiency and realizes material saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following will briefly introduce the drawings required for the description of the embodiment. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0015] Figure 1 It is a structural schematic diagram of the prior art.

[0016] Figure 2 It is a structural schematic diagram of the utility model.

[0017] Figure 3 It is a schematic diagram of the voltage regulating section in the utility model.

[0018] Figure 4 It is a connection principle diagram of the voltage regulating section in the utility model.

[0019] Description of main reference numerals:

[0020] 10-iron core, 20-high voltage coil basic section, 30-voltage regulating section, 31-double coil coil, 311-positive winding coil, 312-negative winding coil. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is a description of the embodiments of the present invention based on its overall structure.

[0025] Example

[0026] like Figures 1 to 4 As shown, Figure 1 This is a (conventional) structural diagram of the prior art. An embodiment of the present application provides a high-voltage coil with on-load voltage regulation, wherein the high-voltage coil includes a high-voltage coil basic section 20 and a voltage regulation section 30 .

[0027] The high-voltage coil basic section 20 and the voltage regulating section 30 are both wound on the same cardboard tube. The voltage regulating section 30 is arranged in the axial direction of the high-voltage coil and is located in the middle and lower part of the entire high-voltage coil.

[0028] Preferably, the high-voltage coil basic section 20 and the voltage regulating section 30 are wound on a cardboard tube and then inserted into the iron core 10 together. The voltage regulating section 30 is arranged at the middle and lower part of the high-voltage coil. Compared with placing the voltage regulating section 30 at the lower part of the high-voltage coil, the imbalance rate of end leakage magnetic field between the high and low voltage coils can be reduced.

[0029] The voltage regulating section 30 includes a plurality of double-pie coils 31 distributed along the axial direction of the high-voltage coil. The parallel-wound conductors in each of the double-pie coils 31 are not transposed. Each of the double-pie coils 31 includes a plurality of tapping sections, which lead out a plurality of tapping points for voltage regulation.

[0030] In this preferred embodiment, the voltage regulating section 30 includes two double-cake coils 31 distributed along the axial direction of the high-voltage coil, each of the double-cake coils 31 includes four tapping sections, and eight tapping points for voltage regulation are led out. Therefore, the two double-cake coils 31 constitute a total of eight tapping sections, and sixteen tapping points for voltage regulation are led out.

[0031] Preferably, the double-coil coil 31 is formed by winding four wires in parallel, including a positive winding coil 311 and a reverse winding coil 312. The parallel-wound wires of the positive winding coil 311 and the reverse winding coil 312 are not transposed. The number of turns of the high-voltage coil basic section 20 is defined as M, and the number of turns of the positive winding coil 311 and the reverse winding coil 312 are both W, then W≤int(M / 2) is satisfied, wherein int() represents a rounding function.

[0032] In summary, the embodiment of the present application provides a high-voltage coil with on-load voltage regulation, which replaces the independently existing regulating coil by setting a voltage regulating section composed of a plurality of double-cake coils between the basic sections of the high-voltage coil, and leading out a plurality of taps for voltage regulation on each double-cake coil, thereby solving the problem in the prior art that an independently existing voltage regulating coil is required to achieve voltage regulation, resulting in an increase in the volume of the transformer; since the axial height of the voltage regulating coil is less than the axial height of the high-voltage coil, it needs to be filled with insulating parts, resulting in a low filling rate of the core window and an increase in the cost required for transformer production; since the voltage regulating coil needs to be made into a special winding mold and an independent cardboard tube for winding separately, and needs to be separately assembled when the transformer body is assembled, the labor, time and production cost required for transformer production increase. At the same time, the utility model reduces the overall volume of the core column, and correspondingly reduces the no-load loss, no-load current and the volume of the oil tank and the transformer, thereby improving production efficiency and achieving material saving and consumption reduction.

[0033] The foregoing descriptions of specific exemplary embodiments of the present invention are for the purpose of explanation and illustration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can make modifications, substitutions, variations and various selections and changes to the embodiments without creative contribution as needed after reading this specification without departing from the principles and purpose of the present invention, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A high voltage coil with on-load voltage regulation, characterized in that: The high-voltage coil comprises a high-voltage coil basic section (20) and a voltage regulating section (30); The high-voltage coil basic section (20) and the voltage regulating section (30) are both wound on the same cardboard tube, and the voltage regulating section (30) is arranged in the axial direction of the high-voltage coil and located in the middle and lower part of the high-voltage coil; The voltage regulating section (30) comprises a plurality of double-pie coils (31) wound along the axial direction of the high-voltage coil, and the parallel-wound conducting wires in each of the double-pie coils (31) are not transposed; A plurality of taps for voltage regulation are led out from each of the double-coil coils (31).

2. The high-voltage coil with on-load voltage regulation according to claim 1, characterized in that: The voltage regulating section (30) comprises two double-coil coils (31) wound and distributed along the axial direction of the high-voltage coil, each of the double-coil coils (31) serving as four tapping sections and leading out tapping points for voltage regulation; The double-coil coil (31) is formed by winding four wires in parallel, and comprises a positive winding coil (311) and a reverse winding coil (312). The parallel-wound wires of the positive winding coil (311) and the reverse winding coil (312) are not transposed.

3. The high-voltage coil with on-load voltage regulation according to claim 2 is characterized in that: The number of turns of the high-voltage coil basic section (20) is defined as M, and the number of turns of the positive winding coil (311) and the reverse winding coil (312) are both defined as W, then W≤int(M / 2) is satisfied, wherein int() represents a rounding function.

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