A short-circuit-resistant core-column energy-extracting shunt reactor

Abstract

The present invention relates to a short-circuit-resistant core-column energy-extracting shunt reactor, which comprises a yoke, a main winding, an energy-extracting winding and a built-in current-limiting reactor. A core column is arranged inside the yoke, the main winding and the energy-extracting winding are both wound around the core column, and one end of the energy-extracting winding is connected in series with the built-in current-limiting reactor. In the present invention, both the main winding and the energy-extracting winding are wound around the core column of the shunt reactor, which not only meets the requirement of compensating high-voltage transmission lines and realizes the energy-extracting function, but also makes the winding and the casing more simple and convenient. Moreover, it is applicable to both single-phase energy-extracting shunt reactors and three-phase energy-extracting shunt reactors, with a wider range of applications.

Description

Technical Field

[0001] The present invention relates to the technical field of reactors, and in particular to a short-circuit-resistant core energy-extracting shunt reactor. Background Art

[0002] As an important device in ultra-high voltage and long-distance AC power transmission networks, the energy-extracting reactor is mainly used to solve the problem of stable operation of the station power supply in remote areas without low-voltage power switch stations in long-distance transmission lines. Its working principle is that while compensating for capacitive current using the reactor, part of the energy is directly extracted from the reactor for lighting and other domestic electricity consumption in the switch station, without affecting the safe and stable operation of the high reactor.

[0003] An energy extraction shunt reactor generally adds an energy extraction winding to a conventional shunt reactor to achieve the purpose of extracting part of the energy from the reactor. For example, the Chinese utility model patent with authorization announcement number CN201594450U discloses a winding mechanism for the energy extraction winding in an energy extraction high-voltage shunt reactor, which includes an energy extraction winding and a main winding. The energy extraction winding consists of two winding parts that are respectively wound at any symmetrical position of the upper iron yoke or the lower iron yoke of the iron core with the iron core core as the symmetry axis. The two winding parts are connected in series or in parallel and then led out. However, when a short circuit occurs on the power consumption side of the above structure, the energy extraction coil will be short-circuited, so that the magnetic flux surrounded by it, including the magnetic flux in the iron yoke, will all change its path and go around the outside of the energy extraction coil to form a loop, which will change the impedance in the power grid and may cause great damage to the power grid line. In order to solve the above problem, a Chinese invention patent with publication number CN108597720A discloses a magnetic shunt for the energy extraction coil of an inductor, which uses magnetic silicon steel sheets rolled along the direction of the magnetic flux to be stacked into a C-shaped magnetic shunt and arranged on both sides of the iron yoke to reduce the impact of the energy extraction coil on the inductor. However, when designing the above structure, only the short-circuit fault of the circuit where the energy extraction winding is located is considered, while the fixation of the energy extraction winding is ignored. Once the vibration amplitude of the energy extraction shunt reactor is too large, the card-mounted C-shaped magnetic shunt structure is likely to cause problems with the energy extraction winding, thereby affecting the safe operation of the energy extraction shunt reactor. In order to solve the above problem, a Chinese utility model patent with authorization announcement number CN206098129U discloses an energy extraction winding used in an energy extraction shunt reactor, each of which includes a corresponding core side yoke. The energy extraction winding body and fixing mechanism on it, the fixing mechanism includes an upper pressure plate, a lower pressure plate, a pull screw and other structures made of insulating material, the fixing mechanism presses and fixes the energy extraction winding body on the corresponding iron core side yoke, even if the vibration amplitude of the energy extraction shunt reactor is too large, the energy extraction winding will not be damaged, and the safe movement requirements of the energy extraction shunt reactor in a long-term vibration and complex environment are met. However, the structure is relatively complex, which not only increases the production cost of the energy extraction reactor, but also increases the installation process and difficulty of the energy extraction reactor, and reduces the production efficiency. In addition, the patent with publication number CN113593831A discloses a three-phase energy extraction reactor structure, which includes three separate single-phase energy extraction reactors, each of which is provided with an iron core column and an iron core side yoke, and the parallel reactor coil is wound on the corresponding iron core column, and the energy extraction coil is wound on the corresponding iron core side yoke. Although the structural accessory equipment only needs to be configured with one unit, since the two energy extraction coils are symmetrically wound on the iron core side yokes on both sides, it is still necessary to separately process the three iron core structures for installation. Summary of the invention

[0004] The object of the present invention is to provide a short-circuit-resistant core energy-extracting shunt reactor, in which both the main winding and the energy-extracting winding are wound on the core of the shunt reactor. While satisfying the compensation of high-voltage transmission lines and realizing the energy-extracting function, the winding and the assembling are simpler and more convenient. Moreover, it is applicable to both single-phase energy-extracting shunt reactors and three-phase energy-extracting shunt reactors, with a wider scope of application.

[0005] The object of the present invention is achieved by the following technical solutions:

[0006] A short-circuit-resistant core energy-extracting shunt reactor includes a yoke, a main winding, an energy-extracting winding, and an internal current-limiting reactor. Wherein, a core is arranged inside the yoke, and both the main winding and the energy-extracting winding are wound on the core, and one end of the energy-extracting winding is connected in series with the internal current-limiting reactor.

[0007] The yoke is arranged in a single-phase shunt reactor. There is one core inside the yoke, and the main winding and the energy-extracting winding are arranged on the core. And the energy-extracting windings of three single-phase energy-extracting reactors together form a three-phase power supply.

[0008] The yoke is arranged in a three-phase shunt reactor. There are three cores inside the yoke, and the main winding and the energy-extracting winding are arranged on each core. The energy-extracting windings on the three cores together form a three-phase power supply.

[0009] Both the main winding and the energy-extracting winding are wound on a core with a circular cross-section.

[0010] A spacer assembly is sleeved on the core, and adjacent windings are separated by corresponding spacer assemblies.

[0011] The spacer assembly includes a plurality of stacked insulating spacers.

[0012] One side of the insulating spacer is disconnected, and a first hook is arranged at one end of the insulating spacer, and a second hook is arranged at the other end of the insulating spacer. Plug blocks are arranged at the lower ends of the insulating spacers, and sockets are arranged at the upper ends of the insulating spacers, and the plug blocks are inserted into the sockets on the adjacent insulating spacers below.

[0013] The advantages and positive effects of the present invention are as follows:

[0014] 1. In the present invention, both the main winding and the energy-extracting winding are wound on the core of the shunt reactor. While satisfying the compensation of high-voltage transmission lines and realizing the energy-extracting function, the winding and the assembling are simpler and more convenient.

[0015] 2. The present invention is applicable to both single-phase energy-extracting shunt reactors and three-phase energy-extracting shunt reactors, with a wider scope of application. Among them, the three-phase energy-extracting shunt reactor can form a three-phase power supply through the energy-extracting windings of three single-phase energy-extracting reactors in a conventional manner, or the yoke can be processed into an integrated structure with three core columns inside, and the main winding and the energy-extracting winding are respectively wound to form a three-phase power supply.

[0016] 3. The present invention can add a length-adjustable spacer assembly on the core column as needed to separate different windings, which is convenient for installation and ensures that the windings are firmly fixed while making the product design more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the energy-extracting winding of an embodiment of the present invention,

[0018] Figure 2 Schematic diagram of the energy-extracting winding of another embodiment of the present invention,

[0019] Figure 3 is Figure 2 Cross-sectional view of the spacer assembly in

[0020] Figure 4 Schematic diagram of the layout when the present invention is used for a single-phase energy-extracting shunt reactor,

[0021] Figure 5 Schematic diagram of the layout when the present invention is used for a three-phase energy-extracting shunt reactor,

[0022] Figure 6 Schematic diagram of the energy-extracting winding wound on the side yoke of the yoke in the prior art.

[0023] Among them, 1 is the main winding, 2 is the energy-extracting winding, 3 is the core column, 4 is the yoke, 5 is the built-in current-limiting reactor, 6 is the spacer assembly, 601 is the insulating spacer, 602 is the insert block, 603 is the first hook, and 604 is the second hook. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described in detail below with reference to the drawings.

[0025] As Figures 1 to 5As shown in the figure, the present invention includes a yoke 4, a main winding 1, an energy extraction winding 2, and a built-in current-limiting reactor 5. A core column 3 is provided inside the yoke 4. The main winding 1 and the energy extraction winding 2 are both wound around the core column 3, and one end of the energy extraction winding 2 is connected in series with the built-in current-limiting reactor 5. The present invention winds the energy extraction winding 2 around the core column 3 to achieve the energy extraction function, and the number of turns and size of the energy extraction winding 2 are determined according to the energy extraction capacity and voltage. Finally, the shunt reactor can achieve the energy extraction function while compensating the line. One end of the energy extraction winding 2 is connected in series with the built-in current-limiting reactor 5, which can reduce the short-circuit current value by more than 50%, thereby improving the short-circuit resistance performance of the product and making the product more reliable. The built-in limiting reactor 5 is a well-known technology in the art and is a commercially available product.

[0026] As Figures 4 to 5 shown, the present invention realizes the energy extraction function by setting the energy extraction winding 2 on the core column 3, so that this method can be applied to both single-phase shunt reactors and three-phase integrated shunt reactors at the same time. As Figure 4 shown, only one core column 3 is provided inside the yoke 4 of the single-phase shunt reactor. The main magnetic flux and part of the leakage magnetic flux of the core column 3 pass through the yoke 4 of the single-phase shunt reactor to be closed. The number of turns and size of the energy extraction winding 2 of the single-phase core column 3 can be determined according to the single-phase energy extraction capacity and voltage, and finally, the energy extraction windings of three single-phase energy extraction reactors can form a three-phase power supply. As Figure 5 shown, the yoke 4 can also adopt an integrated structure with three core columns 3 inside. The main winding 1 and the energy extraction coil 2 are wound around the corresponding core columns 3 respectively. The main magnetic flux and part of the leakage magnetic flux of the three-phase core columns 3 pass through the integrated yoke 4 to be closed. Similarly, the number of turns and size of the energy extraction winding 2 on each core column 3 are determined according to the three-phase energy extraction capacity and voltage, and finally, a three-phase power supply is output.

[0027] The present invention is convenient for winding and sleeving the windings, enhancing the operability of the structure. As Figure 6 shown, the cross-section of the side yoke of the yoke 4 in the prior art is usually a rectangular structure, which is relatively difficult to wind and is prone to looseness. However, in the present invention, the energy extraction winding 2 is directly wound around the core column 3 with a circular cross-section together with the main winding 1, and the winding is simpler and more secure.

[0028] In addition, in order to ensure the firm fixation of the windings, as Figure 2 shown, in another embodiment of the present invention, a spacer assembly 6 is sleeved on the core column 3 to separate different windings, and the length of the spacer assembly 6 in the axial direction can be adjusted according to the actual winding pressing situation, making it more flexible to use.

[0029] As Figure 3As shown, the spacer assembly 6 includes a plurality of stackable insulating spacers 601. One side of the insulating spacer 601 is disconnected, and a first hook 603 is provided at one end break of the insulating spacer 601, and a second hook 604 is provided at the other end break. The first hook 603 and the second hook 604 are engaged to form a complete spacer. During installation, the operator lifts the first hook 603 to disengage from the second hook 604 to disconnect the spacer, and then winds the insulating spacer 601 around the core column 3 and re-engages and fixes the first hook 603 and the second hook 604 to re-form a complete annular spacer to complete the installation. Additionally, as Figure 3 shown, insertion blocks 602 are provided at the lower ends of the insulating spacers 601, and insertion sockets are provided at the upper ends. The insertion blocks 602 are inserted into the insertion sockets on the adjacent insulating spacers 601 below, so as to realize the firm stacking and positioning between two adjacent insulating spacers 601.

[0030] The working principle of the present invention is as follows:

[0031] In the present invention, both the main winding 1 and the energy extraction winding 2 are wound around the core column 3 of the shunt reactor. While satisfying the compensation of high-voltage transmission lines and realizing the energy extraction function, the winding and sleeving are simpler and more convenient. In addition, one end of the energy extraction winding 2 is connected in series with an internal current-limiting reactor 5, which can reduce the short-circuit current value by more than 50%, improve the short-circuit resistance performance of the product, and make the product more reliable. Additionally, the present invention is applicable to both single-phase energy extraction shunt reactors and three-phase energy extraction shunt reactors, with a wider range of applications. Among them, the three-phase energy extraction shunt reactor can form a three-phase power supply through the energy extraction windings of three single-phase energy extraction reactors in a conventional manner, or the yoke 4 can be processed into an integral structure with three core columns 3 provided inside, and the main winding 1 and the energy extraction winding 2 are respectively wound to form a three-phase power supply. In order to ensure that different windings are fixed firmly, the present invention can also add a spacer assembly 6 with adjustable length on the core column 3 according to needs. While facilitating installation and ensuring firm winding fixation, the product design is more flexible.

Claims

1. A short-circuit resistant core column energy extraction type shunt reactor, characterized in that: It includes a yoke (4), a main winding (1), an energy extraction winding (2), and a built-in current-limiting reactor (5). A core column (3) is provided inside the yoke (4). The main winding (1) and the energy extraction winding (2) are both wound around the core column (3), and one end of the energy extraction winding (2) is connected in series with the built-in current-limiting reactor (5). A spacer assembly (6) is sleeved on the core column (3), and the main winding (1) and the adjacent energy extraction winding (2) are separated by the spacer assembly (6). The spacer assembly (6) includes a plurality of stacked insulating spacers (601). One circumferential side of the insulating spacer (601) is disconnected. A first hook (603) is provided at one end of the broken port of the insulating spacer (601), and a second hook (604) is provided at the other end of the broken port. Plug blocks (602) are provided at the lower ends of the insulating spacers (601), and sockets are provided at the upper ends. The plug blocks (602) are inserted into the sockets on the adjacent insulating spacers (601) below.

2. The anti-short-circuit core column energy extraction type shunt reactor according to claim 1, wherein: The yoke (4) is provided in a single-phase shunt reactor. A core column (3) is provided inside the yoke (4). The main winding (1) and the energy extraction winding (2) are provided on the core column (3), and the energy extraction windings (2) of three single-phase energy extraction reactors together form a three-phase power supply.

3. The anti-short-circuit core column energy extraction type shunt reactor according to claim 1, characterized in that: The yoke (4) is provided in a three-phase shunt reactor. Three core columns (3) are provided inside the yoke (4). The main winding (1) and the energy extraction winding (2) are provided on each core column (3), and the energy extraction windings (2) on the three core columns (3) together form a three-phase power supply.

4. The anti-short-circuit core-column energy-extracting type shunt reactor according to claim 1, characterized in that: The main winding (1) and the energy extraction winding (2) are both wound around the core column (3) with a circular cross-section.

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