A multi-winding high-impedance energy-taking transformer

Abstract

The present invention relates to a multi-winding high-impedance energy-taking transformer, comprising an oil tank, a mesh sleeve, a valve sleeve, and multiple transformer bodies. The transformer body comprises an iron core, a winding group A, and a winding group B, wherein the winding groups A and B are arranged vertically and sleeved on the iron core. The winding groups A and B have the same structure, each comprising an upper valve winding, a lower valve winding, and a mesh winding. The upper valve winding and the lower valve winding are arranged vertically and wound on the iron core, and the mesh winding is wound outside the upper and lower valve windings. The oil tank is provided with a mesh sleeve and a valve sleeve, and mesh winding outgoing wires are led out from the outside of the mesh winding. The mesh winding outgoing wires in the winding group A and the mesh winding outgoing wires in the winding group B are connected in parallel, and the head end lead and the end lead of the parallel connection are respectively connected to the corresponding mesh sleeve. The outgoing wires of the upper valve winding and the outgoing wires of the lower valve winding are respectively connected to the corresponding valve sleeve. The present invention meets the power supply requirements of a new voltage regulator.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, in particular to a multi-winding high-impedance energy-taking transformer. Background Art

[0002] To completely address the mechanical failures that can occur during the frequent operation of on-load tap-changers used in converter transformers, existing technologies have begun to explore the use of new voltage regulators as replacements for on-load tap-changers. These new voltage regulators utilize power electronic devices to switch current on and off, achieving real-time voltage regulation while energized, eliminating the need for mechanical mechanisms. However, these new voltage regulators require power to power their internal power electronic devices, and this power supply must be electrically isolated from the converter transformer. Existing devices do not meet these requirements. Summary of the Invention

[0003] The object of the present invention is to provide a multi-winding high-impedance energy-taking transformer, which meets the power supply requirements of a new voltage regulator and electrically isolates the voltage regulator from the converter transformer.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] A multi-winding high-impedance energy-taking transformer comprises an oil tank, a mesh sleeve, a valve sleeve and a plurality of body parts arranged in the oil tank, wherein the body part comprises an iron core, a group A winding and a group B winding, and the group A winding and the group B winding are arranged up and down and sleeved on the iron core, the group A winding and the group B winding have the same structure, both comprising an upper valve winding, a lower valve winding and a mesh winding, wherein the upper valve winding and the lower valve winding are arranged up and down and wound on the iron core, and the mesh winding is wound on the outside of the upper valve winding and the lower valve winding, the oil tank is provided with a mesh sleeve and a valve sleeve, the mesh winding outgoing wire is led out from the outside of the mesh winding, and the mesh winding outgoing wire in the group A winding and the mesh winding outgoing wire in the group B winding are connected in parallel, and the head end lead and the end lead after parallel connection are respectively connected to the corresponding mesh sleeve, and the outgoing wire of the upper valve winding and the outgoing wire of the lower valve winding are respectively connected to the corresponding valve sleeve.

[0006] An upper valve winding outgoing line is led out from one side of the upper valve winding, and a lower valve winding outgoing line is led out from one side of the lower valve winding. The upper valve winding outgoing line and the lower valve winding outgoing line are respectively connected to corresponding valve sleeves.

[0007] The upper valve winding and the lower valve winding are both arranged up and down on the iron core in the form of U-shaped spiral windings, and the mesh winding is wound on the outside of the upper valve winding and the lower valve winding in the form of continuous windings.

[0008] A heat dissipation device is provided on one side of the oil tank, and an oil storage cabinet is provided on the upper side of the oil tank.

[0009] A mesh sleeve is provided on the upper side of the oil tank, and a valve sleeve is provided on the side of the oil tank away from the heat dissipation device.

[0010] The advantages and positive effects of the present invention are:

[0011] 1. The present invention adopts a relatively simple winding structure. Each grid winding is connected in parallel, and each valve winding is independently connected. This ensures that, under the capacity standard of a single valve winding, the short-circuit impedance from the grid side to the valve side is ≥30%, and the short-circuit impedance between the valve-side windings is ≥75%. This meets the power supply requirements of the new voltage regulator and electrically isolates the voltage regulator from the converter transformer. At the same time, the short-circuit impedance imbalance rate between each valve winding is ≤5%, ensuring that the interaction between multiple valve windings meets the design requirements.

[0012] 2. The present invention can determine the number of valve windings and the number of valve bodies according to actual needs, making the design more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the appearance of the present invention,

[0014] Figure 2 for Figure 1 In the H-direction view,

[0015] Figure 3 This is a schematic diagram of the winding structure of a single device body of the present invention.

[0016] Figure 4 Schematic diagram of the wiring principle of the present invention.

[0017] Among them, 1 is the oil tank, 2 is the mesh casing, 3 is the valve casing, 4 is the heat dissipation device, 5 is the oil storage cabinet, 6 is the iron core, 7 is the group A winding, 8 is the group B winding, 9 is the mesh winding, 10 is the upper valve winding, 11 is the lower valve winding, 12 is the mesh winding outlet, 13 is the upper valve winding outlet, and 14 is the lower valve winding outlet. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] like Figures 1 to 4 As shown, the present invention includes a fuel tank 1, a mesh sleeve 2, a valve sleeve 3 and a plurality of bodies arranged in the fuel tank 1, such as Figure 3As shown, the device body includes an iron core 6, a group A winding 7 and a group B winding 8, and the group A winding 7 and the group B winding 8 are arranged up and down on the iron core 6, and the group A winding 7 and the group B winding 8 have the same structure, and both include an upper valve winding 10, a lower valve winding 11 and a mesh winding 9, wherein the upper valve winding 10 and the lower valve winding 11 are arranged up and down on the iron core 6 in the form of U-shaped spiral winding, and the upper valve winding output line 13 is led out from one side of the upper valve winding 10, and the lower valve winding output line 14 is led out from one side of the lower valve winding 11, and the mesh winding 9 is wound on the outside of the upper valve winding 10 and the lower valve winding 11 in the form of continuous winding, and the mesh winding output line 12 is led out from the outside of the mesh winding 9, as shown Figures 1-2 and Figure 4 As shown, the oil tank 1 is provided with a mesh sleeve 2 and a valve sleeve 3. The mesh winding outgoing wires 12 in group A winding 7 and the mesh winding outgoing wires 12 in group B winding 8 are connected in parallel by connecting their head ends to their head ends and their tail ends to their tail ends. The head end leads and tail end leads of the parallel connection are respectively connected to the corresponding mesh sleeve 2, while the upper valve winding outgoing wires 13 and the lower valve winding outgoing wires 14 are respectively connected to the corresponding valve sleeve 3. The U-shaped spiral winding form and the continuous winding form are both well known in the art.

[0020] like Figures 1-2 As shown, a heat dissipation device 4 is provided on one side of the oil tank 1, and an oil storage cabinet 5 is provided on the upper side of the oil tank 1. In this embodiment, the heat dissipation device 4 is a radiator or a cooler, which is a well-known technology in the art and a commercially available product.

[0021] like Figures 1-2 As shown, the upper side of the oil tank 1 is provided with a mesh sleeve 2, and the side of the oil tank 1 away from the heat sink 4 is provided with a valve sleeve 3. In this embodiment, three identical valve sleeves are provided within the oil tank 1, and a total of 24 valve sleeves 3 are provided on one side of the oil tank 1, designated a1-a12 and b1-b12, respectively. a1 and b1 are led out through a double-core sleeve. The upper valve winding outlet 13 and the lower valve winding outlet 14 are independent outlets and are respectively connected to the corresponding valve sleeve 3. The number of valve windings and the number of valve sleeves can be designed according to actual needs. The number of valve windings is first determined based on the needs, and then the number of valve sleeves is determined based on the number of valve windings. The mesh winding outlets 12 on each valve sleeve are all led out in parallel, and the parallel head and tail outlets are respectively connected to the corresponding mesh sleeve 2. The mesh sleeves 2 and valve sleeves 3 are both well known in the art.

[0022] The working principle of the present invention is:

[0023] The present invention is a single-phase transformer structure, wherein the iron core 6 is a single-phase two-column iron core. The ends of the grid winding outgoing wire 12 and the ends of the valve winding outgoing wire are both insulated. The present invention adopts a relatively simple winding structure, ensuring that the grid-side to valve-side short-circuit impedance is ≥30% under the capacity standard of a single valve winding. When in use, the primary winding of the present invention (i.e., the grid winding 9) is connected to the power supply winding of the converter transformer, and the secondary winding of the present invention is composed of multiple independent windings (i.e., the upper valve winding 10 and the lower valve winding 11) and connected to the new voltage regulator. The short-circuit impedance between the valve-side windings is ≥75%, and the short-circuit impedance imbalance rate between the various valve windings is ≤5%, ensuring that the interaction between the multiple valve windings meets the design requirements. The present invention meets the power supply requirements of the new voltage regulator while electrically isolating the voltage regulator from the converter transformer.

Claims

1. A multi-winding high-impedance energy-taking transformer, characterized by: The invention comprises an oil tank (1), a mesh sleeve (2), a valve sleeve (3) and a plurality of device bodies arranged in the oil tank (1); the device bodies comprise an iron core (6), a group A winding (7) and a group B winding (8); the group A winding (7) and the group B winding (8) are arranged vertically and sleeved on the iron core (6); the group A winding (7) and the group B winding (8) have the same structure, and both comprise an upper valve winding (10), a lower valve winding (11) and a mesh winding (9); the upper valve winding (10) and the lower valve winding (11) are arranged vertically and wound on the iron core (6); the mesh winding (9) is wound outside the upper valve winding (10) and the lower valve winding (11); A mesh sleeve (2) and a valve sleeve (3) are provided on the oil tank (1); a mesh winding outgoing line (12) is led out from the outside of the mesh winding (9); the mesh winding outgoing line (12) in the A group winding (7) and the mesh winding outgoing line (12) in the B group winding (8) are connected in parallel, and the head end lead and the end lead after parallel connection are respectively connected to the corresponding mesh sleeve (2); the outgoing line of the upper valve winding (10) and the outgoing line of the lower valve winding (11) are respectively connected to the corresponding valve sleeve (3); the mesh winding (9) is a primary winding and is connected to the power supply winding of the converter transformer; the upper valve winding (10) and the lower valve winding (11) constitute a secondary winding and are connected to a voltage regulator.

2. The multi-winding high-impedance energy-harvesting transformer according to claim 1, characterized in that: An upper valve winding outgoing wire (13) is led out from one side of the upper valve winding (10), and a lower valve winding outgoing wire (14) is led out from one side of the lower valve winding (11). The upper valve winding outgoing wire (13) and the lower valve winding outgoing wire (14) are respectively connected to corresponding valve sleeves (3).

3. The multi-winding high-impedance energy-harvesting transformer according to claim 1, characterized in that: The upper valve winding (10) and the lower valve winding (11) are both arranged in a U-shaped spiral winding manner and wound on the iron core (6) in an upper and lower arrangement, and the mesh winding (9) is wound on the outside of the upper valve winding (10) and the lower valve winding (11) in a continuous winding manner.

4. The multi-winding high-impedance energy-harvesting transformer according to claim 1, characterized in that: A heat dissipation device (4) is provided on one side of the oil tank (1), and an oil storage cabinet (5) is provided on the upper side of the oil tank (1).

5. The multi-winding high-impedance energy-harvesting transformer according to claim 4, characterized in that: A mesh sleeve (2) is provided on the upper side of the oil tank (1), and a valve sleeve (3) is provided on the side of the oil tank (1) away from the heat dissipation device (4).

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