Three-winding oil-immersed transformer suitable for new energy wind power system

Abstract

This utility model relates to the field of power equipment technology, specifically to a three-winding oil-immersed transformer suitable for new energy wind power systems. By integrating low-voltage, medium-voltage, and high-voltage windings into one device, combined with a longitudinal seven-step core design, a compact layout with the low-voltage winding located inside, the medium-voltage winding in the center, and the high-voltage winding located outside, and a reinforced structure where the low-voltage leads are wrapped with 3mm thick corrugated paper and the medium and high-voltage leads are fixed with multi-strand cables and multi-position wooden clamps, this effectively solves the problem that traditional dual-winding transformers can only output two voltages and cannot meet the high / medium / low voltage multi-terminal grid connection requirements of wind power systems. The use of a U-shaped oil tank and high-strength dry bushings further reduces the equipment footprint, investment cost, and maintenance complexity, while improving impact resistance and heat dissipation performance, perfectly adapting to the trend of increasing single-unit installed capacity in new energy power generation.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a three-winding oil-immersed transformer suitable for new energy wind power systems. Background Technology

[0002] In the current field of power equipment technology, the two-winding oil-immersed transformer, as a traditional power conversion device, has demonstrated its unique advantages in multiple application scenarios. Its mature design and stable manufacturing process enable it to effectively achieve voltage step-up and step-down transformations, meeting the needs of general power transmission and distribution. Through excellent insulation design and heat dissipation systems, the two-winding oil-immersed transformer ensures the stability and reliability of the equipment during long-term operation, providing strong support for the safe operation of the power system. Furthermore, its relatively low maintenance costs and ease of operation further promote its widespread application in the market.

[0003] However, the dual-winding oil-immersed transformer design commonly used in the current market can only provide two voltage outputs, which cannot directly meet the multi-voltage level grid connection requirements of wind power systems. In practical applications, in order to achieve multi-voltage level outputs, it is often necessary to use two or more transformers in combination. This not only increases the investment cost of the equipment, but also occupies more space and increases the complexity and cost of maintenance and management. In addition, as the installed capacity of a single new energy power generation unit continues to increase, the performance requirements for transformers are also getting higher and higher. Traditional dual-winding transformers are proving inadequate in matching the development trend of new energy. Utility Model Content

[0004] The purpose of this invention is to provide a three-winding oil-immersed transformer suitable for new energy wind power systems. This addresses the problem that the commonly used two-winding oil-immersed transformer design in the current market can only provide two voltage outputs, failing to directly meet the multi-voltage level grid connection requirements of wind power systems. In practical applications, to achieve multi-voltage level outputs, it is often necessary to combine two or more transformers, which not only increases equipment investment costs but also occupies more space, increasing the complexity and cost of maintenance and management. Furthermore, as the installed capacity of single new energy power generation units continues to increase, the performance requirements for transformers are also becoming increasingly stringent, making traditional two-winding transformers inadequate in matching the development trend of new energy.

[0005] To achieve the above object, a three-winding oil-immersed transformer applicable to a new energy wind power system adopted by the utility model includes an oil tank, a low-voltage bushing, a medium-voltage bushing, a high-voltage bushing and a core body. The low voltage of the core body is a multi-conductor parallel-wound layer winding, the medium voltage of the core body is a multi-layer winding, and the high voltage of the core body is an upper and lower segmented layer winding. The low-voltage bushing is arranged on one side of the oil tank, the medium-voltage bushing is arranged on one side of the oil tank, and the low-voltage bushing is located above the medium-voltage bushing. The high-voltage bushing is arranged on the other side of the oil tank.

[0006] Among them, the iron core structure in the core body is a longitudinal seven-step structure.

[0007] Among them, the structural arrangement in the core body is that the low-voltage winding is arranged inside and close to the iron core structure, the medium-voltage winding is arranged in the middle, and the high-voltage winding is arranged outside. Each winding is separated by cardboard and support bars.

[0008] Among them, the low-voltage leads in the core body are connected by copper bars, the outer package is crinkled paper with a thickness of 3 mm, and they are clamped by wooden clamping parts.

[0009] Among them, the medium-voltage leads and high-voltage leads in the core body are led out by multi-strand cable wires and are clamped by multiple wooden clamping parts at the root of the coil, the upper end of the iron core and the position close to the bushing.

[0010] Among them, the structure of the oil tank is an eye-shaped layout, and the low-voltage bushing, the medium-voltage bushing and the high-voltage bushing of the three windings all adopt high-strength dry bushings.

[0011] A three-winding oil-immersed transformer applicable to a new energy wind power system of the utility model integrates the low-voltage, medium-voltage and high-voltage windings in one device, combines the iron core design of the longitudinal seven-step structure, the compact layout of the low-voltage winding inside, the medium-voltage winding in the middle and the high-voltage winding outside in the core body, and the strengthened structure of the low-voltage leads wrapped with 3-mm thick crinkled paper on copper bars and the medium-high voltage leads fixed by multi-strand cable wires and multiple-position wooden clamping parts, effectively solving the problem that the traditional double-winding transformer can only output two voltages and cannot meet the requirements of high / medium / low voltage multi-terminal grid connection of the wind power system. The adoption of the eye-shaped layout oil tank and the high-strength dry bushing further reduces the equipment floor area, investment cost and maintenance complexity, and at the same time improves the impact resistance and heat dissipation performance, perfectly adapting to the trend of increasing the single-unit installed capacity of new energy power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a front view of the three-winding oil-immersed transformer of this utility model, applicable to new energy wind power systems.

[0014] Figure 2 This is a side view of the three-winding oil-immersed transformer of this utility model, applicable to new energy wind power systems.

[0015] Figure 3 This is a top view of the three-winding oil-immersed transformer of this utility model, applicable to new energy wind power systems.

[0016] 1-Oil tank, 2-Low-pressure bushing, 3-Medium-pressure bushing, 4-High-pressure bushing, 5-Body. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0018] Please see Figures 1 to 3 This utility model provides a three-winding oil-immersed transformer suitable for new energy wind power systems, including an oil tank 1, a low-voltage bushing 2, a medium-voltage bushing 3, a high-voltage bushing 4, and a transformer body 5. The low-voltage section of the transformer body 5 is a multi-wire parallel winding, the medium-voltage section of the transformer body 5 is a multi-layer winding, and the high-voltage section of the transformer body 5 is a segmented layer winding. The low-voltage bushing 2 is located on one side of the oil tank 1, the medium-voltage bushing 3 is located on one side of the oil tank 1, and the low-voltage bushing 2 is located above the medium-voltage bushing 3. The high-voltage bushing 4 is located on the other side of the oil tank 1.

[0019] In this embodiment, by integrating a three-winding structure, a single transformer can output three voltage levels: high, medium, and low. This solves the problem that traditional dual-winding transformers require two devices to meet multiple voltage demands, significantly reducing equipment investment costs and floor space, while also improving system compactness.

[0020] Furthermore, the core structure in the body 5 is a longitudinal seven-step structure.

[0021] In this embodiment, by optimizing the magnetic circuit design, core loss, no-load current and operating noise are effectively reduced, while excitation inrush current is reduced, transformer energy efficiency and stability are improved, and the requirements of new energy wind power systems for high-efficiency and low-noise operation of equipment are met.

[0022] Furthermore, the structural arrangement in the body 5 is such that the low-voltage winding is located on the inner side near the iron core structure, the medium-voltage winding is located in the middle, and the high-voltage winding is located on the outer side, with each winding separated by cardboard and support bars.

[0023] In this embodiment, by making full use of the core space and shortening the magnetic circuit length between windings to reduce leakage reactance, and by forming insulation and heat dissipation channels with cardboard and support bars, the windings of each voltage level are ensured to meet the withstand voltage and lightning impulse requirements, taking into account both structural compactness and electrical safety.

[0024] Furthermore, the low-voltage leads in the device body 5 are connected by copper busbars, wrapped with crepe paper with a thickness of 3mm, and held by wooden clamps.

[0025] In this embodiment, copper busbars are used to reduce lead resistance and heat generation, 3mm crepe paper provides insulation protection, and wooden clips enhance the lead's impact resistance, effectively coping with mechanical stress under fan overload or impact load, and improving lead reliability.

[0026] Furthermore, the medium-voltage lead and high-voltage lead in the device body 5 are led out with multi-strand cable and clamped by multiple wooden clamps at the root of the coil, the upper end of the iron core and near the sleeve.

[0027] In this embodiment, the flexibility and current carrying capacity of the lead wire are improved by using multi-strand cables, and the mechanical stress is fixed and dispersed by wooden clamps at multiple positions, preventing the lead wire from loosening or breaking due to vibration during the operation of the fan, and enhancing the long-term stability of the equipment under complex working conditions.

[0028] Furthermore, the oil tank 1 has a U-shaped layout, and the low-pressure bushing 2, the medium-pressure bushing 3, and the high-pressure bushing 4 of the three windings all adopt high-strength dry bushings.

[0029] In this embodiment, the heat dissipation oil circuit is optimized by the structure of the I-shaped oil tank 1, thereby improving the heat exchange efficiency; the high-strength dry bushing has strong impact resistance, adapts to harsh outdoor environments, reduces maintenance needs, and the overall design reduces the total life cycle cost of the equipment.

[0030] In this invention, the low-voltage winding is located close to the inner side of the iron core, directly receiving the low-voltage electrical energy output by the fan; the medium-voltage winding is centrally located, boosting the low-voltage energy to the medium-voltage level; the high-voltage winding is located on the outer side, further boosting the energy to the high-voltage grid-connected level. The three windings are connected by cardboard and support bars to form insulation and heat dissipation channels, ensuring that the high / medium / low-voltage windings meet the requirements for withstand voltage and lightning strikes. The longitudinal seven-step iron core structure reduces magnetic reluctance and no-load loss, minimizing inrush current and noise. The low-voltage leads are connected by copper busbars and wrapped with 3mm crepe paper, secured with wooden clamps to enhance impact resistance; the medium-voltage and high-voltage leads are led out through multi-strand cables and clamped at multiple key locations to prevent loosening due to fan overload or vibration. The shaped oil tank 1 optimizes the heat dissipation oil circuit and, together with the high-strength dry bushing, achieves efficient heat dissipation and impact resistance. Finally, it outputs three voltage levels through the low-voltage bushing 2, the medium-voltage bushing 3, and the high-voltage bushing 4 to meet the multi-terminal grid connection requirements of the wind power system.

[0031] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A three-winding oil-immersed transformer suitable for new energy wind power systems, characterized in that, The device includes an oil tank, a low-pressure bushing, a medium-pressure bushing, a high-pressure bushing, and a transformer body. The low-pressure bushing of the transformer body is a multi-wire parallel winding, the medium-pressure bushing of the transformer body is a multi-layer winding, and the high-pressure bushing of the transformer body is a segmented layer winding. The low-pressure bushing is located on one side of the oil tank, the medium-pressure bushing is located on one side of the oil tank and above the medium-pressure bushing, and the high-pressure bushing is located on the other side of the oil tank.

2. The three-winding oil-immersed transformer suitable for new energy wind power systems as described in claim 1, characterized in that, The iron core structure in the vessel body is a longitudinal seven-step structure.

3. The three-winding oil-immersed transformer suitable for new energy wind power systems as described in claim 2, characterized in that, The structural arrangement of the device body is such that the low-voltage winding is located on the inner side close to the iron core structure, the medium-voltage winding is located in the middle, and the high-voltage winding is located on the outer side, with each winding separated by cardboard and support bars.

4. The three-winding oil-immersed transformer suitable for new energy wind power systems as described in claim 3, characterized in that, The low-voltage leads in the device body are connected by copper busbars, wrapped with 3mm thick crepe paper, and held by wooden clamps.

5. The three-winding oil-immersed transformer suitable for new energy wind power systems as described in claim 4, characterized in that, The medium-voltage and high-voltage leads in the device body are led out by multi-strand cables and are clamped by multiple wooden clamps at the root of the coil, the upper end of the iron core, and near the bushing.

6. The three-winding oil-immersed transformer suitable for new energy wind power systems as described in claim 5, characterized in that, The oil tank has a U-shaped layout, and the low-pressure bushing, medium-pressure bushing and high-pressure bushing of the three windings are all high-strength dry bushings.

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