Combination switch device and reactive compensation system of transformer substation

Abstract

The utility model relates to the technical field of reactive compensation, in particular to a combined switch device and a transformer substation reactive compensation system, the combined switch device comprises a capacitance reactance switch mechanism, the capacitance reactance switch mechanism comprises a reactor capacitance-adjusting switch unit, and a power supply loop comprises a first inductance coil, a second inductance coil and a third inductance coil. When the reactor capacitance-adjusting switch unit is in the first connection position, the first inductance coil and the second inductance coil are connected in parallel and then are connected in series with the third inductance coil to be connected into a power supply loop. And when the reactor capacitance-adjusting switch unit is located at the second connection position, the first inductance coil and the second inductance coil are connected in series and then connected with the third inductance coil in series to be connected into the power supply loop. According to the combined switch device and the transformer substation reactive power compensation system provided by the invention, the capacity of the reactor of the transformer substation reactive power compensation device is adjustable, the switching and discharging of the parallel capacitor are realized, the adaptability of the reactor of the transformer substation reactive power compensation device is improved, the setting number of the reactor is reduced, and the cost is reduced.

Description

Combined switchgear and substation reactive power compensation system Technical Field

[0001] This application relates to the field of reactive power compensation technology, and in particular to a combined switchgear and a substation reactive power compensation system. Background Technology

[0002] In substations, reactive current generated in the circuits during power transmission and distribution can lead to energy waste and grid instability. In AC power systems, reactive power (usually expressed as VAR or kVAR) is a type of power generated by the presence of inductive or capacitive elements. It is not directly converted into useful power consumption, but it affects the efficiency and quality of power transmission. Substation reactive power compensation is based on the characteristics of parallel capacitors. In AC circuits, capacitors have the ability to store and release charge. When inductive loads in the grid consume reactive power, capacitors release their stored charge to provide that reactive power, thus reducing the flow of reactive power in the grid—a power system optimization technique. It is mainly used to improve the efficiency and stability of the power system, reduce the flow of reactive power in the grid, thereby reducing line losses, increasing voltage levels, and enhancing system stability and reliability.

[0003] However, the reactors in current substation reactive power compensation devices cannot adjust their capacity, which means that each capacitor bank needs to be equipped with one reactor. If the compensation unit is more finely graded, multiple reactors are required, which increases the cost.

[0004] Furthermore, capacitor switching devices account for a significant proportion of the cost of reactive power compensation units in substations. Currently, capacitor switching devices in substation reactive power compensation systems are large in size and expensive. Summary of the Invention

[0005] The purpose of this application is to provide a combined switchgear and a substation reactive power compensation system to solve, to some extent, the technical problem that the reactors in the existing substation reactive power compensation devices cannot adjust their capacity, which requires one reactor for each capacitor unit, and multiple reactors are required if the compensation unit is more finely graded, resulting in high costs.

[0006] According to a first aspect of this application, a combined switching device is provided for a substation reactive power compensation system, including a capacitor-reactor switching mechanism, wherein the capacitor-reactor switching mechanism includes a reactor capacity adjustment switching unit, the reactor capacity adjustment switching unit being used to connect to a power supply circuit, the power supply circuit including a first inductor coil, a second inductor coil and a third inductor coil;

[0007] The reactor capacity adjustment switch unit can switch between a first connection position and a second connection position;

[0008] When the reactor capacity adjustment switch unit is in the first connection position, the first inductor coil and the second inductor coil are connected in parallel and then connected in series with the third inductor coil to the power supply circuit;

[0009] When the reactor capacity adjustment switch unit is in the second connection position, the first inductor coil and the second inductor coil are connected in series and then connected in series with the third inductor coil to the power supply circuit.

[0010] Preferably, the reactor capacity adjustment switch unit includes a reactor capacity adjustment section, which includes a first reactor stationary contact, a second reactor stationary contact, a third reactor stationary contact, a first reactor moving contact, and a second reactor moving contact. The first reactor stationary contact, the second reactor stationary contact, and the third reactor stationary contact are arranged sequentially at intervals along a first direction. The first reactor moving contact is slidably disposed between the first reactor stationary contact and the second reactor stationary contact, and the second reactor moving contact is slidably disposed between the second reactor stationary contact and the third reactor stationary contact.

[0011] The contact point of the first reactor stationary contact faces the second reactor stationary contact, and the contact points of the second reactor stationary contact and the third reactor stationary contact face each other.

[0012] When the reactor capacity adjustment switch unit is in the first connection position, the first reactor moving contact is connected to the first reactor stationary contact, and the second reactor moving contact is connected to the second reactor stationary contact;

[0013] When the reactor capacity adjustment switch unit is in the second connection position, the first reactor moving contact is disconnected from the first reactor stationary contact, and the second reactor moving contact is connected to the third reactor stationary contact.

[0014] Preferably, the reactor capacity adjustment switch unit further includes a plurality of reactor capacity adjustment sections and a first movable plate extending along the first direction. The first and second moving contacts of the plurality of reactor capacity adjustment sections are all disposed on the first movable plate, and the first, second, and third stationary contacts of the plurality of reactor capacity adjustment sections are all fixed to the mounting plate.

[0015] Preferably, the capacitor reactance switching mechanism further includes a capacitor switching assembly, which includes a first capacitor switching switch unit, a second capacitor switching switch unit, a first discharge resistor, and a second discharge resistor. The first discharge resistor is disposed in a first discharge circuit, and the second discharge resistor is disposed in a second discharge circuit. The first capacitor switching switch unit is used to control the first capacitor circuit to be connected to the power supply circuit or the first discharge circuit, and the second capacitor switching switch unit is used to control the second capacitor circuit to be connected to the power supply circuit or the second discharge circuit.

[0016] Preferably, the capacitor switching assembly includes a capacitor switching section, which includes a moving capacitor contact, a first stationary capacitor contact, and a second stationary capacitor contact. The first stationary capacitor contact and the second stationary capacitor contact are positioned opposite each other along a first direction and spaced apart. The moving capacitor contact is slidably disposed between the first stationary capacitor contact and the second stationary capacitor contact.

[0017] And / or, the first capacitor switching unit and the second capacitor switching switch unit are arranged side by side in a second direction, which intersects with the first direction, and the first discharge resistor and the second discharge resistor are respectively disposed at both ends of the first capacitor switching unit and the second capacitor switching switch unit in the first direction.

[0018] Preferably, both the first capacitor switching unit and the second capacitor switching switch unit include a second moving plate extending along the first direction and a plurality of capacitor switching sections, wherein the moving capacitor contacts in the plurality of capacitor switching sections are disposed on the second moving plate, and the stationary capacitor contacts in the plurality of capacitor switching sections are fixed to the mounting plate.

[0019] Preferably, the capacitor-reactor switching mechanism further includes a mounting plate, a first permanent magnet drive mechanism, a second permanent magnet drive mechanism, and a third permanent magnet drive mechanism. The first permanent magnet drive mechanism is used to drive the first capacitor switching unit, the second permanent magnet drive mechanism is used to drive the second capacitor switching unit, and the third permanent magnet drive mechanism is used to drive the reactor capacity adjustment switch unit.

[0020] The mounting plate includes a first mounting surface and a second mounting surface that are disposed opposite to each other;

[0021] The reactor capacity adjustment switch unit, the first capacitor switching switch unit, and the second capacitor switching switch unit are arranged side by side on the first mounting surface;

[0022] The first permanent magnet drive mechanism, the second permanent magnet drive mechanism, and the third permanent magnet drive mechanism are arranged side by side on the second mounting surface.

[0023] Preferably, it further includes:

[0024] The capacitor reactor switch mechanism is disposed in the first oil chamber;

[0025] The second oil chamber is provided inside the first oil chamber. The first oil chamber is provided with a connecting hole, and the first oil chamber communicates with the second oil chamber through the connecting hole.

[0026] A filter section is disposed in the connecting hole.

[0027] Preferably, it also includes a vacuum load switch, which is used to control whether the capacitor-reactor switch mechanism is energized;

[0028] The vacuum load switch is arranged side by side with the first oil chamber, and both the first oil chamber and the vacuum load switch are located in the second oil chamber.

[0029] According to the second aspect of this application, a substation reactive power compensation system is provided, including the combined switchgear described in any of the above technical solutions, and thus possesses all the beneficial technical effects of the combined switchgear, which will not be repeated here.

[0030] Compared with the prior art, the beneficial effects of this application are as follows:

[0031] The combined switchgear provided in this application, by setting a reactor capacity adjustment switch unit for connecting to the power supply circuit, allows the first inductor coil and the second inductor coil to be connected in parallel to the power supply circuit when the reactor capacity adjustment switch unit is in the first connection position. When the reactor capacity adjustment switch unit is in the second connection position, the first inductor coil and the second inductor coil are connected in series to the power supply circuit. In this way, by changing the connection mode of the first inductor coil and the second inductor coil to the power supply circuit through the reactor capacity adjustment switch unit, the capacity of the reactor in the reactive power compensation device of the substation can be adjusted, as well as the switching and discharging of the parallel capacitors can be achieved. This effectively improves the adaptability of the reactor in the reactive power compensation device of the substation, reduces the number of reactors required, and reduces costs.

[0032] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 is a schematic diagram of the internal structure of the capacitor reactor switch mechanism provided in an embodiment of this application;

[0035] Figure 2 is another internal structure schematic diagram of the capacitor reactor switch mechanism provided in the embodiment of this application;

[0036] Figure 3 is a front view of the combined switch device provided in the embodiment of this application.

[0037] Figure label:

[0038] 10-Capacitor switching section; 101-First capacitor stationary contact; 102-Second capacitor stationary contact; 103-Capacitor moving contact; 11-First capacitor switching unit; 12-Second capacitor switching unit; 13-Second moving plate; 20-Reactor adjustment section; 201-First reactor stationary contact; 202-First reactor moving contact; 203-Second reactor stationary contact; 204-Second reactor moving contact; 205-Third reactor stationary contact; 21-First moving plate; 31-First discharge resistor; 32-Second discharge resistor; 41-First mounting surface; 42-Second mounting surface; 5-First oil chamber; 51-Connecting hole; 52-Outlet sealing plate; 6-Filter section; 71-First permanent magnet drive mechanism; 72-Second permanent magnet drive mechanism; 73-Third permanent magnet drive mechanism; 8-Vacuum load switch; F1-First direction; F2-Second direction. Detailed Implementation

[0039] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0040] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0041] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] The combined switchgear and substation reactive power compensation system according to some embodiments of this application are described below with reference to Figures 1 to 3.

[0045] Referring to Figures 1 to 3, an embodiment of the first aspect of this application provides a combined switching device for a substation reactive power compensation system. The device includes a capacitor-reactor switching mechanism, which further includes a reactor capacity adjustment switching unit. This unit is used to connect to a power supply circuit, which includes a first inductor coil, a second inductor coil, and a third inductor coil. The reactor capacity adjustment switching unit can switch between a first connection position and a second connection position. When the reactor capacity adjustment switching unit is in the first connection position, the first and second inductor coils are connected in parallel and then in series with the third inductor coil to connect to the power supply circuit. When the reactor capacity adjustment switching unit is in the second connection position, the first and second inductor coils are connected in series and then in series with the third inductor coil to connect to the power supply circuit.

[0046] According to the combined switchgear provided by the above technical features, by setting a reactor capacity adjustment switch unit for connecting to the power supply circuit, when the reactor capacity adjustment switch unit is in the first connection position, the first inductor coil and the second inductor coil are connected in parallel and then connected in series with the third inductor coil to the power supply circuit. When the reactor capacity adjustment switch unit is in the second connection position, the first inductor coil and the second inductor coil are connected in series and then connected in series with the third inductor coil to the power supply circuit. In this way, by changing the connection mode of the first inductor coil and the second inductor coil to the power supply circuit through the reactor capacity adjustment switch unit, the capacity of the reactor in the reactive power compensation device of the substation can be adjusted, and the switching and discharging of the parallel capacitor can be achieved. This effectively improves the adaptability of the reactor in the reactive power compensation device of the substation, reduces the number of reactors required, and reduces costs.

[0047] Preferably, as shown in FIG1, the above-mentioned capacitor-reactor switch mechanism further includes a reactor capacity adjustment switch unit. The reactor capacity adjustment switch unit may include a reactor capacity adjustment section 20, which may include a first reactor stationary contact 201, a second reactor stationary contact 203, a third reactor stationary contact 205, a first reactor moving contact 202, and a second reactor moving contact 204. The first reactor stationary contact 201, the second reactor stationary contact 203, and the third reactor stationary contact 205 are arranged sequentially at intervals along the first direction F1. The contacts of the first reactor stationary contact 201 face the second reactor stationary contact 203. The contacts of the second reactor stationary contact 203 and the third reactor stationary contact 205 face each other. The first reactor moving contact 202 is slidably disposed between the first reactor stationary contact 201 and the second reactor stationary contact 203. The second reactor moving contact 204 is slidably disposed between the second reactor stationary contact 203 and the third reactor stationary contact 205. The first reactor moving contact 202 can be connected or disconnected from the first reactor stationary contact 201 by sliding the first reactor moving contact 202, and the second reactor moving contact 204 can be connected to the second reactor stationary contact 203 or the third reactor stationary contact 205 by sliding the second reactor moving contact 204.

[0048] Preferably, as shown in Figure 1, the figure shows a schematic diagram of the reactor capacity adjustment switch unit in the first connection position. Specifically, when the reactor capacity adjustment switch unit is in the first connection position (i.e., both the first reactor moving contact 202 and the second reactor moving contact 204 are slid to the left end), the first reactor moving contact 202 is connected to the first reactor stationary contact 201, and the second reactor moving contact 204 is connected to the second reactor stationary contact 203, so as to realize that the first inductor coil and the second inductor coil are connected in parallel to the power supply circuit.

[0049] Preferably, as not shown in the figure, when the reactor regulating switch unit is in the first connection position (i.e., both the first reactor moving contact and the second reactor moving contact are slid to the right end), the first reactor moving contact is disconnected from the first reactor stationary contact, and the second reactor moving contact is connected to the third reactor stationary contact, so as to realize that the first inductor coil and the second inductor coil are connected in series to the power supply circuit.

[0050] It should be noted that the connection method of the first inductor coil, the second inductor coil, the third inductor coil and the reactor capacity adjustment switch unit in the above power supply circuit is the prior art in this field (see Chinese patent document CN118944112A Substation reactive power compensation system and method), and will not be described again here.

[0051] Preferably, as shown in FIG1, the reactor capacity adjustment switch unit may further include a reactor capacity adjustment section 20 and a first moving plate 21 extending along the first direction F1. The first reactor stationary contact 201, the second reactor stationary contact 203 and the third reactor stationary contact 205 in the reactor capacity adjustment section 20 are all fixedly disposed on the mounting plate. The first reactor moving contact 202 and the second reactor moving contact 204 are respectively disposed on the first moving plate 21. By having the first reactor moving contact 202 and the second reactor moving contact 204 both disposed on the first moving plate 21, the smoothness, accuracy and stability of the switching and docking of the first reactor moving contact 202 and the second reactor moving contact 204 are effectively guaranteed.

[0052] It should be noted that the method of the moving contact making contact with and disconnecting from the stationary contact through a moving plate is existing technology in this field and will not be elaborated here.

[0053] Optionally, as shown in Figure 1, the above-mentioned reactor capacity adjustment switch unit includes an example of three reactor capacity adjustment sections 20 to facilitate the control of three-phase circuits. Preferably, as shown in Figure 1, the three reactor capacity adjustment sections 20 can be arranged sequentially along the first direction F1 to realize the functional partitioning of the combined switch device, facilitating the assembly and maintenance of the combined switch device. However, it is not limited to this; the above-mentioned reactor capacity adjustment switch unit may also include one reactor capacity adjustment section 20 to facilitate the control of single-phase circuits.

[0054] Preferably, as shown in FIG1, the three reactor adjustment parts 20 included in the reactor adjustment switch unit can all be disposed on the same first moving plate 21, so as to save the number of moving plates, simplify the structure of the reactor adjustment switch unit, reduce the space occupied by the reactor adjustment switch unit and reduce the assembly difficulty of the reactor adjustment switch unit.

[0055] Preferably, as shown in FIG1, the capacitor reactance switch mechanism may further include a capacitor switching assembly. This capacitor switching assembly may include a first capacitor switching switch unit 11, a second capacitor switching switch unit 12, a first discharge resistor 31, and a second discharge resistor 32. The first discharge resistor 31 is disposed in the first discharge circuit, and the second discharge resistor 32 is disposed in the second discharge circuit. The first capacitor switching switch unit 11 is used to control the connection between the first capacitor circuit and the power supply circuit or the first discharge circuit. The second capacitor switching switch unit 12 is used to control the connection between the second capacitor circuit and the power supply circuit or the second discharge circuit. Thus, by configuring the switch unit 12 to control the connection between the first capacitor circuit and the power supply circuit... The first capacitor switching unit 11 (i.e., connecting the first capacitor circuit to the power supply circuit or connecting the first capacitor circuit to the first discharge circuit) and the second capacitor switching unit 12 (i.e., connecting the second capacitor circuit to the power supply circuit or connecting the second capacitor circuit to the second discharge circuit) are connected to the first discharge circuit or connecting the first discharge circuit. Thus, by changing the connection device of the first capacitor switching unit 11 and the second capacitor switching unit 12, the regulating capacity of the capacitor of the reactive power compensation device of the substation is realized, thereby further reducing the manufacturing cost of the combined switchgear.

[0056] Similarly, the connection structure of the first capacitor circuit, the second capacitor circuit, the first discharge circuit, and the second discharge circuit is also existing technology in this field (see Chinese patent document CN118944112A Substation Reactive Power Compensation System and Method), and will not be described again here.

[0057] Preferably, as shown in FIG1, the capacitor switching assembly may include a capacitor switching section 10. The capacitor switching section 10 may include a capacitor moving contact 103, a first capacitor stationary contact 101, and a second capacitor stationary contact 102. The first capacitor stationary contact 101 and the second capacitor stationary contact 102 are positioned opposite each other and spaced apart along a first direction F1. The capacitor moving contact 103 is slidably disposed between the first capacitor stationary contact 101 and the second capacitor stationary contact 102, so that the capacitor moving contact 103 can communicate with either the first capacitor stationary contact 101 or the second capacitor stationary contact 102.

[0058] Preferably, as shown in FIG1, the first capacitor switching unit 11 may include a second moving plate 13 extending along the first direction F1 and the capacitor switching section 10. The stationary capacitor contacts in the capacitor switching section 10 are all fixed to the mounting plate, and the moving capacitor contacts 103 in the capacitor switching section 10 are all disposed on the second moving plate 13 to effectively ensure the switching accuracy and stability of the moving capacitor contacts 103. In this way, switching the moving capacitor contact 103 of the first capacitor switching unit 11 to contact the corresponding first capacitor stationary contact 101 or the second capacitor realizes the switching of the connection between the first capacitor circuit and the power supply circuit or the connection between the first capacitor circuit and the first discharge circuit.

[0059] As shown in Figure 1, the first capacitor switching unit 11 includes three capacitor switching sections 10 to facilitate separate control of a three-phase circuit. Preferably, as shown in Figure 1, the three capacitor switching sections 10 of the first capacitor switching unit 11 can all be disposed on the same second moving plate 13 to facilitate the arrangement of the first capacitor switching unit 11. However, it is not limited to this; the first capacitor switching unit 11 may also include a single capacitor switching section 10 to facilitate control of a single-phase circuit.

[0060] Similarly, as shown in FIG1, the second capacitor switching unit 12 may also include a second moving plate 13 extending along the first direction F1 and the capacitor switching part 10. The structure of the second capacitor switching unit 12 is similar to that of the first capacitor switching unit 11. By switching the capacitor moving contact 103 of the second capacitor switching unit 12 to contact the corresponding first capacitor stationary contact 101 or the second capacitor, the connection between the second capacitor circuit and the power supply circuit or the second capacitor circuit can be switched.

[0061] As shown in Figure 1, the second capacitor switching unit 12 also includes three capacitor switching sections 10 to facilitate separate control of three-phase circuits. Preferably, as shown in Figure 1, the three capacitor switching sections 10 included in the second capacitor switching unit 12 can all be disposed on the same second moving plate 13 to facilitate the arrangement of the second capacitor switching unit 12. However, it is not limited to this; the second capacitor switching unit 12 may also include a single capacitor switching section 10 to facilitate control of single-phase circuits.

[0062] Preferably, as shown in FIG1, the first capacitor switching unit 11 and the second capacitor switching switch unit are arranged side by side in the second direction F2, which may intersect with the first direction F1.

[0063] As shown in Figures 1 to 3, F1 shown in the figures can be an example of the first direction F1 described above, and F2 shown in the figures can be an example of the second direction F2 described above. Preferably, the first direction F1 and the second direction F2 can be perpendicular to each other, so as to adapt to most cuboid cabinets today and save space utilization of the combination switch device.

[0064] Preferably, as shown in FIG1, the first discharge resistor 31 and the second discharge resistor 32 are respectively disposed at both ends of the first capacitor switching unit 11 and the second capacitor switching switch unit in the first direction F1. On the one hand, this facilitates shortening the line connection length between the first capacitor switching unit 11 and the first discharge circuit and the line length between the second capacitor switching unit 12 and the second discharge circuit, effectively reducing the lead wire cost and space occupancy of the capacitor reactor switching mechanism. On the other hand, it enables the first discharge resistor 31 and the second discharge resistor 32 to effectively utilize the size difference between the reactor regulating switch unit and the first capacitor switching unit 11 (or the second capacitor switching unit 12) in the first direction F1, further improving the space utilization of the combined switch device.

[0065] In an embodiment, as shown in Figures 1 and 2, the capacitor reactor switching mechanism may further include a mounting plate, which may include a first mounting surface 41 and a second mounting surface 42 disposed opposite to each other. Optionally, as shown in Figure 1, the reactor capacity adjustment switch unit, the first capacitor switching switch unit 11, and the second capacitor switching switch unit 12 may be disposed side by side on the first mounting surface 41.

[0066] Preferably, as shown in FIG2, the capacitor-reactor switching mechanism may further include a first permanent magnet drive mechanism 71, a second permanent magnet drive mechanism 72, and a third permanent magnet drive mechanism 73. The first permanent magnet drive mechanism 71 can drive the first capacitor switching unit 11, the second permanent magnet drive mechanism 72 can drive the second capacitor switching unit 12, and the third permanent magnet drive mechanism 73 can drive the reactor capacity adjustment switch unit. Preferably, as shown in FIG2, the first permanent magnet drive mechanism 71, the second permanent magnet drive mechanism 72, and the third permanent magnet drive mechanism 73 can all be disposed on the second mounting surface 42. Thus, by using the two opposing first mounting surfaces 41 and 42 of the mounting plate, the high-frequency circuit (i.e., the primary side circuit) and the low-frequency circuit (i.e., the secondary side circuit) of the combined switching device are separated, effectively reducing the insulation distance between the primary and secondary sides (i.e., the safety distance between the primary side circuit and the secondary side circuit), and further compressing the spatial volume of the combined switching device.

[0067] In the embodiments, as shown in Figures 1 to 3, the aforementioned combined switch device may further include a first oil chamber 5, in which the aforementioned capacitor-reactor switch mechanisms may all be disposed (i.e., the aforementioned reactor capacity adjustment switch unit, first capacitor switching switch unit 11, second capacitor switching switch unit 12, first discharge resistor 31, second discharge resistor 32, mounting plate, first permanent magnet drive mechanism 71, second permanent magnet drive mechanism 72, and third permanent magnet drive mechanism 73 are all disposed in the first oil chamber 5). Thus, on the one hand, integrating the reactor capacity adjustment switch unit, first capacitor switching switch unit 11, and second capacitor switching switch unit 12 into the same oil chamber (i.e., the first oil chamber 5) can effectively reduce the lead distance between switches and reduce the overall size of the combined switch, thereby saving costs; on the other hand, by isolating the capacitor-reactor switch mechanism from other equipment through the first oil chamber 5, the stability of the installation environment of the capacitor-reactor switch mechanism is ensured and the installation safety of the capacitor-reactor switch mechanism is effectively improved.

[0068] Preferably, as not shown in the figure, the aforementioned combined switchgear may further include a second oil chamber, in which the first oil chamber may be disposed. It should be noted that both the first and second oil chambers may be filled with transformer oil, which improves the insulation strength and heat dissipation performance of the combined switchgear, thereby achieving the arc-suppression function and protecting the insulating materials, ensuring the safe and stable operation of the combined switchgear.

[0069] It should be noted that the aforementioned second oil chamber can be understood as the cabinet of the substation reactive power compensation system described below.

[0070] Preferably, as shown in FIG1, the first oil chamber 5 may be provided with a connecting hole 51, and the first oil chamber 5 may be connected to the second oil chamber through the connecting hole 51 to achieve hydraulic consistency between the first oil chamber 5 and the second oil chamber.

[0071] Preferably, as shown in Figures 1 to 3, the first oil chamber 5 may further include a filter section 6, which may be disposed in the connecting hole 51 to prevent impurities in the transformer oil in the second oil chamber from entering the first oil chamber 5, ensuring the independence and cleanliness of the transformer oil in the first oil chamber 5. This ensures that if other equipment in the second oil chamber malfunctions, it will not affect the capacitor-reactor switching mechanism in the first oil chamber 5. Optionally, the filter section 6 may be a filter element, but it is not limited to this. The filter section 6 may also be other filtration structures, such as filter cotton, filter screen, etc.

[0072] Optionally, as shown in FIG1, the two sidewalls of the first oil chamber 5 in the second direction F2 can be configured as outgoing sealing plates 52, and the capacitor reactor switch mechanism can be connected to the equipment outside the first oil chamber 5 via the outgoing sealing plates 52.

[0073] Preferably, as shown in FIG3, the above-mentioned combined switch device may further include a vacuum load switch 8, which is used to control whether the capacitor reactor switch mechanism is energized or not, so that during the process of adjusting the reactor capacity through the capacitor reactor switch mechanism, the capacitor reactor switch mechanism can be de-energized through the vacuum load switch 8, thereby preventing the capacitor reactor switch mechanism from generating an electric arc during the adjustment process.

[0074] It should be noted that the connection method of the vacuum load switch 8 to the above-mentioned capacitor reactor switch mechanism is the prior art in this field (see Chinese patent document CN118944112A Substation reactive power compensation system and method), and will not be described again here.

[0075] Preferably, as shown in Figure 3, the vacuum load switch 8 and the first oil chamber 5 are arranged side by side, and both the first oil chamber 5 and the vacuum load switch 8 are located in the second oil chamber. On the one hand, the vacuum load switch 8 unit serves as the main incoming load switch and is separately arranged outside the first oil chamber 5, which reduces the size and weight of the first oil chamber 5 and reduces the assembly difficulty. On the other hand, it shortens the connection distance between the vacuum load switch 8 and the first oil chamber 5, which facilitates the wiring of the substation reactive power compensation system.

[0076] Preferably, as shown in FIG3, the vacuum load switch 8 can be disposed on one side of the first oil chamber 5 in the second direction F2, so that the connection between the vacuum load switch 8 and the first oil chamber 5 is led out through the outlet sealing plate 52 on the side of the first oil chamber 5 near the vacuum load switch 8, so as to further shorten the connection distance between the vacuum load switch 8 and the first oil chamber 5.

[0077] Based on the features described above, taking the combined switchgear shown in Figures 1 to 3 as an example, the following will describe in detail the beneficial effects of the combined switchgear:

[0078] 1. The reactor capacity adjustment switch unit, the first capacitor switching switch unit 11 and the second capacitor switching switch unit 12 are integrated into the first oil chamber 5, which reduces the lead distance between the switches and reduces the overall size of the combined switch, thereby saving costs.

[0079] 2. The reactor capacity adjustment switch unit, the first capacitor switching switch unit 11, and the second capacitor switching switch unit 12 are integrated into the first oil chamber 5, which is independently sealed and connected to the second oil chamber through the filter section 6. This ensures equal pressure inside and outside the first oil chamber 5 while preventing cross-contamination of the transformer oil inside and outside the first oil chamber 5. When equipment on one side of the first oil chamber 5 fails, it will not affect the insulation of equipment on the other side.

[0080] 3. The first discharge resistor 31 and the second discharge resistor 32 are arranged in the first oil chamber 5, and the first discharge resistor 31 and the second discharge resistor 32 are arranged close to the first capacitor switching unit 11 and the second capacitor switching unit 12, which effectively reduces the number of outgoing terminals at the outgoing sealing plate 52 of the first oil chamber 5, thereby saving costs.

[0081] 4. The reactor capacity adjustment switch unit, the first capacitor switching switch unit 11 and the second capacitor switching switch unit 12, together with the first permanent magnet drive mechanism 71, the second permanent magnet drive mechanism 72 and the third permanent magnet drive mechanism 73, are respectively installed on both sides of the mounting plate, which reduces the overall size of the machine while ensuring the insulation distance between the primary and secondary components.

[0082] 5. The vacuum load switch unit 8 serves as the main incoming load switch and is separately arranged outside the first oil chamber 5, which reduces the size of the first oil chamber 5 housing, thereby reducing not only the weight of the first oil chamber 5 but also the assembly difficulty.

[0083] The second aspect of this application also provides a substation reactive power compensation system, including the combined switchgear described in any of the above embodiments, and thus has all the beneficial technical effects of the combined switchgear, which will not be repeated here.

[0084] Preferably, as not shown in the figure, the above-mentioned substation reactive power compensation system may include the above-mentioned power supply circuit, the above-mentioned first inductor coil, the second inductor coil, the first capacitor circuit, and the second capacitor circuit.

[0085] Preferably, as not shown in the figure, the power supply circuit, the first inductor coil, the second inductor coil, the first capacitor circuit, and the second capacitor circuit can all be disposed in the second oil chamber.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A combined switchgear for a substation reactive power compensation system, characterized in that, The device includes a capacitor-reactor switching mechanism, which comprises a reactor capacity adjustment switch unit. The reactor capacity adjustment switch unit is used to connect to a power supply circuit, which includes a first inductor, a second inductor, and a third inductor. The reactor capacity adjustment switch unit can switch between a first connection position and a second connection position. When the reactor capacity adjustment switch unit is in the first connection position, the first and second inductors are connected in parallel and then in series with the third inductor to connect to the power supply circuit. When the reactor capacity adjustment switch unit is in the second connection position, the first and second inductors are connected in series and then in series with the third inductor to connect to the power supply circuit.

2. The combined switch device according to claim 1, characterized in that, The reactor capacity adjustment switch unit includes a reactor capacity adjustment section, which includes a first reactor stationary contact, a second reactor stationary contact, a third reactor stationary contact, a first reactor moving contact, and a second reactor moving contact. The first, second, and third reactor stationary contacts are sequentially spaced apart along a first direction. The first reactor moving contact is slidably disposed between the first and second reactor stationary contacts, and the second reactor moving contact is slidably disposed between the second and third reactor stationary contacts. The contacts of the first reactor stationary contact face the second reactor stationary contact, and the contacts of the second reactor stationary contact and the third reactor stationary contact face each other. When the reactor capacity adjustment switch unit is in the first connection position, the first reactor moving contact is connected to the first reactor stationary contact, and the second reactor moving contact is connected to the second reactor stationary contact. When the reactor capacity adjustment switch unit is in the second connection position, the first reactor moving contact is disconnected from the first reactor stationary contact, and the second reactor moving contact is connected to the third reactor stationary contact.

3. The combined switch device according to claim 2, characterized in that, The reactor capacity adjustment switch unit further includes a plurality of reactor capacity adjustment sections and a first movable plate extending along the first direction. The first and second moving contacts of the plurality of reactor capacity adjustment sections are all disposed on the first movable plate, and the first, second, and third stationary contacts of the plurality of reactor capacity adjustment sections are all fixed to the mounting plate.

4. The combined switch device according to claim 1, characterized in that, The capacitor reactance switch mechanism further includes a capacitor switching assembly, which includes a first capacitor switching switch unit, a second capacitor switching switch unit, a first discharge resistor, and a second discharge resistor. The first discharge resistor is disposed in a first discharge circuit, and the second discharge resistor is disposed in a second discharge circuit. The first capacitor switching switch unit is used to control the first capacitor circuit to be connected to the power supply circuit or the first discharge circuit, and the second capacitor switching switch unit is used to control the second capacitor circuit to be connected to the power supply circuit or the second discharge circuit.

5. The combination switch device according to claim 4, characterized in that, The capacitor switching assembly includes a capacitor switching section, which includes a capacitor moving contact, a first capacitor stationary contact, and a second capacitor stationary contact. The first capacitor stationary contact and the second capacitor stationary contact are positioned opposite each other and spaced apart along a first direction. The capacitor moving contact is slidably disposed between the first capacitor stationary contact and the second capacitor stationary contact. Alternatively, the first capacitor switching unit and the second capacitor switching switch unit are arranged side-by-side in a second direction, which intersects the first direction. The first discharge resistor and the second discharge resistor are respectively disposed at both ends of the first capacitor switching unit and the second capacitor switching switch unit in the first direction.

6. The combination switch device according to claim 5, characterized in that, Both the first capacitor switching unit and the second capacitor switching switch unit include a second moving plate extending along the first direction and a plurality of capacitor switching parts. The moving capacitor contacts in the plurality of capacitor switching parts are disposed on the second moving plate, and the stationary capacitor contacts in the plurality of capacitor switching parts are fixed to the mounting plate.

7. The combination switch device according to claim 4, characterized in that, The capacitor-reactor switching mechanism further includes a mounting plate, a first permanent magnet drive mechanism, a second permanent magnet drive mechanism, and a third permanent magnet drive mechanism. The first permanent magnet drive mechanism is used to drive the first capacitor switching unit, the second permanent magnet drive mechanism is used to drive the second capacitor switching unit, and the third permanent magnet drive mechanism is used to drive the reactor capacity adjustment switch unit. The mounting plate includes a first mounting surface and a second mounting surface that are arranged opposite to each other. The reactor capacity adjustment switch unit, the first capacitor switching unit, and the second capacitor switching unit are arranged side by side on the first mounting surface. The first permanent magnet drive mechanism, the second permanent magnet drive mechanism, and the third permanent magnet drive mechanism are arranged side by side on the second mounting surface.

8. The combined switch device according to claim 1, characterized in that, Also includes: The capacitor reactor switch mechanism is disposed in the first oil chamber; The second oil chamber is provided within the first oil chamber, and the first oil chamber is provided with a connecting hole, through which the first oil chamber communicates with the second oil chamber; a filter is provided within the connecting hole.

9. The combination switch device according to claim 8, characterized in that, It also includes a vacuum load switch, which is used to control whether the capacitor reactor switch mechanism is energized or not; the vacuum load switch is arranged side by side with the first oil chamber, and both the first oil chamber and the vacuum load switch are located in the second oil chamber.

10. A reactive power compensation system for a substation, characterized in that, The combination switch device includes any one of claims 1 to 9.

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