Rectifier transformer

Abstract

The utility model provides a rectifier transformer, a low-voltage lead wire of the rectifier transformer adopts a star-shaped wiring and angular wiring double-winding same-iron-core circuit, a star-shaped winding and an angular winding are tightly combined to form a lead-out wire, and a connection group of the star-shaped winding and the angular winding adopts any one of four labels of d0y5, d0y7, d1y6 and d11y6.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of transformers, in particular to a rectifier transformer. BACKGROUND

[0002] In some medium-power electrolytic smelting plants, in order to save investment costs, a 12-pulse single-core rectifier transformer is generally selected to supply power to the electrolytic smelting system, so that the low voltage of the rectifier transformer needs to be provided with star connection and corner connection double windings to achieve the 12-pulse effect.

[0003] According to the outgoing line experience of a double-split power transformer, that is, two groups of low voltage are arranged according to a1b1c1 and a2b2c2 to lead out lines, due to the coil arrangement characteristics of the single-core double low voltage, the internal lead of the transformer needs to be adjusted in position and recombined as a1b1c1 and a2b2c2. Since the two groups of low voltage independently bear loads, in order to prevent the external bus from being staggered, the two groups of low voltage need to be provided with loose independent structure lead. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the application provide a rectifier transformer to at least solve the deficiencies in the related art.

[0005] In a first aspect, the embodiments of the application provide a rectifier transformer, and the low voltage lead of the rectifier transformer adopts star connection and corner connection double winding same-core lines, wherein the star connection winding and the corner connection winding lead out lines in a close combination structure, and the connection group of the star connection winding and the corner connection winding adopts any one of d0y5, d0y7, d1y6 and d11y6.

[0006] Further, the star connection winding and the corner connection winding are arranged according to a1a2, b1b2 and c1c2 to lead out lines.

[0007] Further, the d0y5 label is a secondary side triangular connection and voltage in phase with a primary side and a secondary side star connection and voltage lagging behind the primary side by 150 degrees, the d0y7 label is a secondary side triangular connection and voltage in phase with a primary side and a secondary side star connection and voltage lagging behind the primary side by 210 degrees, the d1y6 label is a secondary side triangular connection and voltage lagging behind the primary side by 30 degrees and a secondary side star connection and voltage lagging behind the primary side by 180 degrees, and the d11y6 label is a secondary side triangular connection and voltage lagging behind the primary side by 330 degrees and a secondary side star connection and voltage lagging behind the primary side by 180 degrees.

[0008] Compared with the related art, the application has the following beneficial effects:

[0009] 1. According to the low-voltage current direction of the rectifier transformer, in a winding operation period (4Π / 3), half of the operation period (2Π / 3) of the four connection groups d0y5, d0y7, d1y6 and d11y6 is completely opposite;

[0010] 2. The star-connected winding and the angle-connected winding are arranged in a close combination structure, and the current directions of the adjacent outgoing terminals are completely opposite in half of the operation period, and the magnetic field generated by the outgoing terminal current of the star-connected winding and the outgoing terminal current of the angle-connected winding is offset;

[0011] 3. The outgoing terminal magnetic field is weakened in an operation period, and the eddy current loss generated by the magnetic field in the surrounding steel structure is greatly reduced;

[0012] 4. The temperature of the steel structure caused by the eddy current loss is greatly reduced.

[0013] The details of one or more embodiments of the present application are presented in the following drawings and description to make other features, objects and advantages of the present application more apparent. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0015] Fig. 1 It is a low-voltage star-connected and angle-connected double-winding low-voltage electrical connection schematic diagram of a single-core 12-pulse rectifier transformer in an embodiment of the present application.

[0016] Fig. 2 It is a schematic diagram of the arrangement of the outgoing terminals of the close combination structure on the steel structure in an embodiment of the present application.

[0017] Fig. 3 It is a low-voltage star-connected and angle-connected double-winding structure low-voltage connection group label schematic diagram of a single-core 12-pulse rectifier transformer in an embodiment of the present application.

[0018] Fig. 4 It is a low-voltage star-connected and angle-connected winding A-phase operation current direction period schematic diagram in an embodiment of the present application.

[0019] The following specific embodiments will further illustrate the present application in combination with the above drawings. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0021] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application, and for those of ordinary skill in the art, the present application can also be applied to other similar scenarios without creative effort based on the accompanying drawings. In addition, it can be understood that although the efforts made in the development process can be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacture or production changes based on the technical content disclosed in the present application are only routine technical means and should not be understood as insufficient disclosure of the content disclosed in the present application.

[0022] In the present application, "embodiments" means that the specific features, structures or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present application can be combined with other embodiments without conflict.

[0023] Unless otherwise defined, technical terms and scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms "a", "an", "one", "this", and the like, as used in the present application, do not denote a quantity or a particular number of the referenced items, but rather denote that there is at least one of the referenced item. The terms "comprise", "comprising", "including", "including", "having" and their conjugates, as used in the present application, specify the presence of the stated features, steps or components but do not preclude the presence or addition of one or more other features, steps, components or groups thereof. The terms "connect", "connected", "coupling" and the like, as used in the present application, do not necessarily denote a direct physical or mechanical connection, but can include an electrical connection, whether direct or indirect. The term "multiple" refers to two or more. The term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects. The terms "first", "second", "third" and the like in the present application are only to distinguish similar objects, and do not represent a specific order of the objects. Embodiments

[0024] Please refer to Figs. 1 to 4 , the rectifier transformer in the embodiment of the utility model is shown, the low voltage of single rectifier transformer adopts star connection and corner connection double winding same core line and structure to achieve 12 pulse rectification purpose, the star connection winding and the corner connection winding are led out by close combination structure lead-out wire (close combination structure lead-out wire refers to two groups of low voltage arranged by a1a2, b1b2, c1c2 label lead-out wire, loose independent structure lead-out wire refers to two groups of low voltage arranged by a1b1c1, a2b2c2 label lead-out wire), the connection group of the star connection winding and the corner connection winding is designed by cooperating with one of d0y5, d0y7, d1y6, d11y6 four labels.

[0025] Among them, d0y5: secondary side triangle connection and voltage and primary side same phase and secondary side star connection and voltage lag primary side 150°, d0y7: secondary side triangle connection and voltage and primary side same phase and secondary side star connection and voltage lag primary side 210°, d1y6: secondary side triangle connection and voltage lag primary side 30° and secondary side star connection and voltage lag primary side 180°, d11y6: secondary side triangle connection and voltage lag primary side 330° and secondary side star connection and voltage lag primary side 180°.

[0026] It can be understood that the rectifier transformer is due to two groups of low voltage commonly with a 12 pulse rectifier, so the internal lead of the transformer can be arranged in a close combination structure a1a2, b1b2, c1c2 without adjusting the position, and the external bus will not be staggered. According to the current direction and the working cycle of the rectifier circuit (different from the power transformer), one of the four labels d0y5, d0y7, d1y6, d11y6 is used, and the current direction is completely opposite in half of the working cycle, the current is offset, and the magnetic field is weakened. The eddy current loss generated in the surrounding steel structure by the weakened magnetic field of the outgoing lead will be reduced, and the temperature of the surrounding steel structure will be reduced.

[0027] The embodiment can achieve the effect of weakening the magnetic field around the outgoing lead according to the current direction of the rectifier circuit and the above-mentioned principle and structure, so as to reduce the eddy current loss and the temperature of the surrounding steel structure.

[0028] In summary, the rectifier transformer in the above-mentioned embodiment of the utility model, according to the low voltage current direction of the rectifier transformer, in a winding working cycle (4Π / 3), d0y5, d0y7, d1y6, d11y6 four connection groups have half of the working cycle (2Π / 3) that is completely opposite; the outgoing lead of the close combination structure of the star-connected winding and the angular winding, the current direction of the adjacent outgoing terminal is completely opposite in half of the working cycle, the magnetic field generated by the current of the star-connected winding outgoing terminal and the current of the angular winding outgoing terminal is offset; the magnetic field of the outgoing terminal is weakened in a working cycle, and the eddy current loss generated in the surrounding steel structure by the magnetic field is greatly reduced; the temperature of the steel structure caused by the eddy current loss is greatly reduced.

[0029] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0030] The above-mentioned embodiments only express several implementation ways of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A rectifier transformer, characterized in that, The low-voltage leads of the rectifier transformer adopt a double-winding core circuit with star and delta connections. The star winding and delta winding are led out in a tightly combined structure. The connection group of the star winding and the delta winding adopts any one of four designations: d0y5, d0y7, d1y6, and d11y6. The d0y5 designation is a secondary side delta connection with voltage in phase with the primary side and a secondary side star connection with voltage lagging behind the primary side by 150°. The d0y7 designation is a secondary side delta connection with voltage in phase with the primary side and a secondary side star connection with voltage lagging behind the primary side by 210°. The d1y6 designation is a secondary side delta connection with voltage lagging behind the primary side by 30° and a secondary side star connection with voltage lagging behind the primary side by 180°. The d11y6 designation is a secondary side delta connection with voltage lagging behind the primary side by 330° and a secondary side star connection with voltage lagging behind the primary side by 180°.

2. The rectifier transformer according to claim 1, characterized in that, The star-connected winding and the delta-connected winding use lead wires arranged with the numbers a1a2, b1b2, and c1c2.

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