Split-phase transformer

Abstract

This utility model discloses a split-phase-shifting transformer, specifically relating to the field of transformers, comprising: an excitation winding, a phase-shifting winding, a high-voltage winding, a voltage-regulating winding, a core, and an oil tank. The excitation winding, phase-shifting winding, high-voltage winding, and voltage-regulating winding are sequentially arranged on the core, and all four windings, along with the core, are housed within the oil tank. This utility model addresses the new demand for power flow regulation in lines by adding a phase-shifting function to the traditional step-up or step-down function of a low-voltage split transformer. This phase-shifting transformer has a single-body structure with fewer windings and simpler wiring. Compared to a multi-transformer combination structure achieving the same function, it is lower in cost, occupies less space, and requires no additional wiring or switches. It is also significantly simpler than a double-body phase-shifting voltage-regulating transformer structure, reducing design and manufacturing difficulty and improving system reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field more specifically, the utility model relates to a kind of split-phase transformer. BACKGROUND

[0002] The phase-shifting transformer currently used for adjusting the power flow distribution and power flow of equipment in power system usually only changes the phase angle of voltage, without voltage boosting or voltage reducing function, and needs to be combined with conventional transformer, so that it not only has phase-shifting function, but also considers the voltage boosting or voltage reducing function of conventional transformer.

[0003] However, the combination of phase-shifting transformer and conventional transformer requires a large number of transformers, and when the number of transformers increases, it will result in more wiring, complex wiring, air and space, increase of land area, and increase of related line and switch investment, resulting in high cost and poor operation reliability and maintainability due to system complexity. UTILITY MODEL CONTENT

[0004] The split-phase transformer provided by the utility model solves the problem that the existing combination of phase-shifting transformer and conventional transformer requires a large number of transformers, and when the number of transformers increases, it will result in more wiring, complex wiring, air and space, increase of land area, and increase of related line and switch investment, resulting in high cost and poor operation reliability and maintainability due to system complexity.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a split-phase transformer, comprising: an excitation winding, a phase-modulating winding, a high-voltage winding, a voltage-regulating winding, a core, and an oil tank, the excitation winding, the phase-modulating winding, the high-voltage winding, and the voltage-regulating winding are arranged in sequence on the core, and the excitation winding, the phase-modulating winding, the high-voltage winding, the voltage-regulating winding, and the core are all placed in the oil tank.

[0006] The transformer is a three-phase structure, and three excitation windings are connected in a triangle at the ends to form a triangular connection, each excitation winding is connected in series with two phase-modulating windings, the three vertices of the triangular connection are connected with the phase-modulating windings of different phases, and the two phase-modulating windings are respectively connected with corresponding phase-modulating switches, and the three line ends of the phase-modulating windings are respectively connected with low-voltage three-phase.

[0007] The high-voltage side of the oil tank is provided with three high-voltage outgoing terminals, the high-voltage outgoing terminals are respectively connected with high-voltage three-phase, the high-voltage side and the low-voltage side of the oil tank are both provided with three low-voltage outgoing terminals, the high-voltage side low-voltage outgoing terminals are respectively connected with high-voltage side low-voltage three-phase, and the low-voltage side low-voltage outgoing terminals are respectively connected with low-voltage side low-voltage three-phase.

[0008] In a preferred embodiment, the connection between the low-voltage sides is an angularly symmetrical phase-shifting structure, and the two line ends of the low-voltage side are connected through a phase-shifting winding.

[0009] In a preferred embodiment, the three-phase high-voltage winding and the voltage-regulating winding are connected in a star connection, a voltage-regulating switch is connected in series between the high-voltage winding and the voltage-regulating winding, the three line ends of the high-voltage winding are respectively connected to the three phases of the high-voltage side, and a high-voltage neutral point is arranged at the low-voltage side of the oil tank.

[0010] In a preferred embodiment, the low-voltage of the transformer is a double-split structure, the connection group between the high-voltage and the low-voltage is Yd-d, the low-voltage winding of the transformer is divided into two parts, each part is connected to two line ends of the high-voltage winding, forming a Yd connection, and d represents that there is a phase difference between the high-voltage winding and the low-voltage winding.

[0011] In a preferred embodiment, the excitation winding is a single-branch end-of-line structure, which means that the excitation winding has only one line out of the end of the winding and is connected to the excitation power supply or control system.

[0012] In a preferred embodiment, the phase-shifting winding is an upper-and-lower axial split double-U-shaped structure, which is used to control the phase difference of the current.

[0013] In a preferred embodiment, the high-voltage winding is a middle-of-line structure, that is, the lead of the high-voltage winding is out of the center of the winding, which is used to generate a magnetic field when the transformer is running.

[0014] In a preferred embodiment, the voltage-regulating winding is an upper-and-lower two-branch parallel structure, which is used to provide greater current capacity and lower voltage fluctuation.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The present utility model adds a phase-shifting function to the boosting or step-down function of the traditional low-voltage split transformer, solves the new demand of line current flow regulation, and has the following advantages: the phase-shifting transformer of the structure is a single-body structure, has a small number of windings, and has simple wiring, which is lower in cost and smaller in land occupation than a multi-transformer combined structure for realizing the same function, does not have additional lines and switches and other additional devices, and is greatly simplified compared with a phase-shifting and voltage-regulating transformer structure with a double-body structure, thereby reducing the design and manufacturing difficulty and improving the reliability of system operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 The figure is a top view of the structure of the present utility model.

[0018] Fig. 2 The figure is a winding connection principle schematic diagram of the present utility model.

[0019] Fig. 3 The winding arrangement schematic diagram of the utility model.

[0020] The figure signs are: 1, excitation winding; 2, phase modulation winding; 3, high voltage winding; 4, voltage regulation winding; 5, iron core; 6, high voltage outgoing terminal; 7, low voltage outgoing terminal; 8, high voltage neutral point; 9, phase modulation switch; 10, voltage regulation switch; 11, oil tank. DETAILED DESCRIPTION

[0021] The following further describes the present application in detail with reference to the drawings. It is necessary to point out that the following detailed description is only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0022] Referring to the drawings Figs. 1 to 3 A split-phase transformer comprises an excitation winding 1, a phase modulation winding 2, a high voltage winding 3, a voltage regulation winding 4, an iron core 5 and an oil tank 11. The excitation winding 1, the phase modulation winding 2, the high voltage winding 3 and the voltage regulation winding 4 are arranged in sequence on the iron core 5, and the excitation winding 1, the phase modulation winding 2, the high voltage winding 3, the voltage regulation winding 4 and the iron core 5 are all placed in the oil tank 11.

[0023] The transformer is of three-phase structure, and three excitation windings 1 are connected at the head and tail to form a triangle connection. Each excitation winding 1 is connected in series with two phase modulation windings 2, and the three vertices of the triangle connection are connected with the phase modulation windings 2 of different phases respectively. The two phase modulation windings 2 are respectively connected with corresponding phase modulation switches 9, and the three line ends of the phase modulation windings 2 are connected with low-voltage three-phase.

[0024] The high voltage three-phase includes three phases A, B and C, the high voltage side low voltage three-phase includes three phases a1, b1 and c1, and the low voltage side low voltage three-phase includes three phases a2, b2 and c2.

[0025] The oil tank 11 is provided with three high voltage outgoing terminals 6 on the high voltage side, and the high voltage outgoing terminals 6 are respectively connected with the three phases of high voltage. The oil tank 11 is provided with three low voltage outgoing terminals 7 on the high voltage side and the low voltage side, the high voltage side low voltage outgoing terminals 7 are respectively connected with the high voltage side low voltage three-phase, and the low voltage side low voltage outgoing terminals 7 are respectively connected with the low voltage side low voltage three-phase.

[0026] It should be noted that the transformer is a three-phase structure, each phase includes one excitation winding 1, two phase modulation windings 2, one high-voltage winding 3 and one voltage regulation winding 4, a total of fifteen windings, the high-voltage three-phase includes A, B, C three-phase, the high-voltage side low-voltage three-phase includes a1, b1, c1 three-phase, the low-voltage side low-voltage three-phase includes a2, b2, c2 three-phase, by arranging the excitation winding 1 and the phase modulation winding 2 on the core, this layout can effectively reduce the magnetic resistance and improve the efficiency of the transformer, by arranging the excitation winding 1 and the phase modulation winding 2 close to the core 5, the magnetic field transmission path is shorter, the magnetic resistance loss is reduced, thereby improving the energy transmission efficiency, by connecting the three excitation windings 1 in a triangular connection, each excitation winding 1 is connected in series with two phase modulation windings 2, the function of the autotransformer can be realized, the autotransformer can realize the transformation of current while transforming voltage, thereby meeting the requirements of power transmission under different load conditions, by connecting the line end of the phase modulation winding 2 to the low-voltage three-phase, the adjustment and control of the low-voltage side voltage can be realized, the existence of the phase modulation winding 2 enables the transformer to adapt to the voltage demand under different load conditions and provide stable output voltage, the high-voltage side and the low-voltage side of the oil tank 11 are provided with outgoing terminals, which can facilitate the wiring and connection of the transformer, the high-voltage side outgoing terminal connects the high-voltage side three-phase power supply, and the low-voltage side outgoing terminal is connected to the load equipment on the low-voltage side, which simplifies the wiring process of the transformer and makes installation and maintenance more convenient.

[0027] Further, the connection between the low-voltage sides is an angularly connected symmetric phase shift structure, and the two line ends of the low-voltage side are connected through the phase modulation winding 2.

[0028] It should be noted that the connection between the low-voltage sides is an angularly connected symmetric phase shift structure, which changes the phase difference between the two by the phase modulation switch 9, balances the phase voltage and current of the low-voltage side, thereby reducing the imbalance of the phase current and avoiding the adverse effects on the transformer and the load caused by the imbalance of the phase current.

[0029] Further, the three-phase high-voltage winding 3 and the voltage regulation winding 4 are connected in a star connection, the voltage regulation switch 10 is connected in series between the high-voltage winding 3 and the voltage regulation winding 4, the three line ends of the high-voltage winding 3 are respectively connected to the three-phase of the high-voltage side, the high-voltage neutral point 8 is arranged at the corner of the low-voltage side of the oil tank 11, and the high-voltage neutral point 8 is connected to the zero phase.

[0030] It should be noted that by connecting the three-phase high-voltage winding 3 and the voltage regulating winding 4 in a star configuration, the high-voltage side voltage can be regulated. The star connection connects the neutral point of the high-voltage winding to the voltage regulating winding 4, allowing the transformer to provide different voltage output options to adapt to voltage requirements under different load conditions. The series connection of the voltage regulating switch 10 between the high-voltage winding 3 and the voltage regulating winding 4 plays a role in regulating the voltage. By opening or closing the voltage regulating switch 10, the series connection method of the windings can be changed, thereby adjusting the output voltage. This flexibility allows the transformer to adapt to different load changes and provide a stable output voltage. By connecting the high-voltage neutral point 8 to the zero phase, neutral point connections can be provided for symmetrical and asymmetrical loads. This can balance the voltage on the high-voltage side and provide insulation protection to ground. At the same time, the setting of the high-voltage neutral point also helps to control voltage stability and fault protection.

[0031] Furthermore, the low-voltage winding of the transformer has a double-split structure, and the connection group between the high and low voltages is Yd-d. The low-voltage winding of the transformer is divided into two parts, each of which is connected to the two ends of the high-voltage winding 3, forming a Yd connection. d indicates that there is a phase difference between the high-voltage winding 3 and the low-voltage winding. The high-low voltage ratio and voltage amplitude can be changed by the voltage regulating switch 10.

[0032] It should be noted that Y indicates a star connection on the high-voltage side, and d indicates a three-phase four-wire system on the low-voltage side. This system is used to connect the star connection on the high-voltage side to the three-phase four-wire system on the low-voltage side. In the Yd-d connection group, the star connection on the high-voltage side is usually achieved by connecting the neutral point of the voltage regulating transformer to ground, while the three-phase four-wire system on the low-voltage side usually consists of three-phase power supply and a neutral wire, used to supply power to various load devices.

[0033] Furthermore, the excitation winding 1 has a single-branch end-out structure, indicating that the excitation winding 1 has only one line leading out from the end of the winding and connecting to the excitation power supply or control system.

[0034] It should be noted that since the excitation winding 1 is a single branch, the current only needs to flow through one path. The distribution and direction of the current are relatively simple and clear, making it easy to control and monitor. Moreover, the single branch structure can reduce the length and volume of the excitation winding 1, making the overall structure of the equipment more compact and space-saving.

[0035] Furthermore, the phase-adjusting winding 2 has an axially split double U-shaped structure, which is used to control the phase difference of the current.

[0036] It should be noted that the axially split structure can provide a more uniform magnetic field distribution, making the output voltage of the power equipment more stable and reliable. In addition, the double U-shaped structure can reduce the magnetic resistance of the magnetic circuit and improve the efficiency of the excitation winding 1 in generating the magnetic field.

[0037] Further, the high-voltage winding 3 is a middle outlet structure, the wire of the high-voltage winding 3 is led out from the center position of the winding, and is used for generating a magnetic field when the transformer is operated.

[0038] It should be noted that the middle outlet structure can balance the voltage distribution of the high-voltage winding 3, reduce the influence of voltage imbalance on the equipment and system, and the middle outlet structure can reduce the length and symmetry difference of the winding, reduce the possibility of damping oscillation, and improve the stability and working efficiency of the equipment.

[0039] Further, the voltage regulating winding 4 is a parallel structure of two branches, which is used for providing greater current capacity and lower voltage fluctuation.

[0040] It should be noted that the parallel structure of two branches can realize the balanced distribution of the current in the voltage regulating winding 4, reduce the influence of current imbalance on the equipment, and the parallel structure can increase the capacity of the voltage regulating winding 4, improve the power regulation range of the equipment, and also increase the flexibility and adaptability of the winding, meet the voltage regulation requirements under different load conditions.

[0041] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the present application. It should be noted that for ordinary skilled persons 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.

Claims

1. A split-phase transformer characterized by, It comprises: The excitation winding (1), the phase modulation winding (2), the high-voltage winding (3), the voltage regulation winding (4), the core (5) and the oil tank (11), the excitation winding (1), the phase modulation winding (2), the high-voltage winding (3), the voltage regulation winding (4) are arranged in sequence on the core (5), and the excitation winding (1), the phase modulation winding (2), the high-voltage winding (3), the voltage regulation winding (4) and the core (5) are all placed in the oil tank (11); The transformer is a three-phase structure, and three excitation windings (1) are connected in a triangle at the ends to form a triangular connection, each excitation winding (1) is connected in series with two phase modulation windings (2), and the three vertices of the triangular connection are respectively connected with the phase modulation windings (2) of different phases, and the two phase modulation windings (2) are respectively connected with corresponding phase modulation switches (9), and the three line ends of the phase modulation winding (2) are respectively connected with low-voltage three-phase. The high-voltage side of the oil tank (11) is provided with three high-voltage outgoing terminals (6), and the high-voltage outgoing terminals (6) are respectively connected with high-voltage three-phase, and the high-voltage side and the low-voltage side of the oil tank (11) are both provided with three low-voltage outgoing terminals (7), and the high-voltage side low-voltage outgoing terminals (7) are respectively connected with high-voltage side low-voltage three-phase, and the low-voltage side low-voltage outgoing terminals (7) are respectively connected with low-voltage side low-voltage three-phase.

2. A split-phase transformer according to claim 1, wherein: The three-phase high-voltage winding (3) and the voltage regulation winding (4) are connected in a star connection, and a voltage regulation switch (10) is connected in series between the high-voltage winding (3) and the voltage regulation winding (4), and the three line ends of the high-voltage winding (3) are respectively connected with the three-phase of the high-voltage side, and the high-voltage neutral point (8) is arranged at the corner of the low-voltage side of the oil tank (11), and the high-voltage neutral point (8) is connected with the zero phase.

3. A split-phase transformer as set forth in claim 1, wherein: The low-voltage of the transformer is a double split structure, and the connection group between the high-voltage and the low-voltage is Yd-d, and the low-voltage winding of the transformer is divided into two parts, each part is connected to two line ends of the high-voltage winding (3), forming a Yd connection, and d represents that there is a phase difference between the high-voltage winding (3) and the low-voltage winding.

4. A split-phase transformer as set forth in claim 1, wherein: The excitation winding (1) is a single branch end outgoing structure, which means that the excitation winding (1) has only one line from the end of the winding, connected to the excitation power supply or control system.

5. A split-phase transformer as set forth in claim 1, wherein: The phase modulation winding (2) is a double U-shaped structure split in the upper and lower axes, which is used to control the phase difference of the current.

6. A split-phase transformer as set forth in claim 1, wherein: The high-voltage winding (3) is a central outgoing structure, and the wires of the high-voltage winding (3) are outgoing from the center of the winding, which is used to generate a magnetic field when the transformer is running.

7. A split-phase transformer as set forth in claim 1, wherein: The voltage regulation winding (4) is a parallel structure of two branches, which is used to provide greater current capacity and lower voltage fluctuation.

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