A compact group automatic switching reactive compensation device

Abstract

The utility model discloses a compact grouping automatic switching of reactive compensation device. Compact grouping automatic switching of reactive compensation device includes: disconnecting switch and two compensation branch, and each compensation branch includes: circuit breaker, electric reactor and capacitor, the first end of disconnecting switch is connected with high voltage incoming line cable, and the second end of disconnecting switch is connected with two compensation branches, and circuit breaker sets up in the front end of compensation branch and is connected with electric reactor, and electric reactor is connected with capacitor, two circuit breakers are arranged in the upper and lower, and two circuit breakers are installed on the same support in upper and lower two layers, two electric reactors are arranged in the upper and lower, and two electric reactors are installed on the base in upper and lower two layers, and two capacitors are respectively arranged in the two sides of capacitor frame and are installed on the fixed frame. The utility model stacks arrangement of circuit breaker and electric reactor in reactive compensation device, to compress the floor area, reduce the site construction cost.

Description

Technical Field

[0001] This utility model relates to the field of power transmission and transformation technology, and in particular to a compact group automatic switching reactive power compensation device. Background Technology

[0002] With national economic development and increased electricity load, coupled with the goals of peaking carbon emissions by 2030 and achieving carbon neutrality by 2060, higher demands will inevitably be placed on the quality of electricity supply for businesses. For businesses, the quality of the power grid directly affects power loss and energy consumption, as well as their electricity costs. For power supply companies, it relates to voltage drop and fluctuations in power lines, energy conservation, and the overall power quality and load across the supply area. Therefore, improving the power factor becomes crucial for enhancing power quality.

[0003] In principle, a capacitor is equivalent to a generator that produces capacitive reactive current. Its reactive power compensation principle involves connecting devices with capacitive power loads and inductive power loads in parallel on the same line, allowing energy to be converted between the two types of loads. This reduces the load on transformers and transmission lines in the power grid, thereby increasing the output active power capacity. In other words, for a given output of active power, the losses in the power supply system are reduced. Compared to other compensation methods, capacitors are one of the simplest and most economical ways to reduce the load on transformers, power supply systems, and industrial distribution systems. Therefore, capacitor compensation is widely accepted in power systems. Currently, the use of capacitor banks as reactive power compensation devices is very mature and inexpensive.

[0004] Conventional 10kV group-based automatic switching reactive power compensation devices are divided into indoor and outdoor installations. Indoor installations often use indoor cabinet-type capacitor banks, which are widely used by industrial and mining enterprises and power departments due to their good performance and small footprint. However, cabinet-type reactive power compensation devices have major heat sources (capacitors and reactors) installed inside the cabinet, and indoor ventilation is limited, causing the capacitors to operate in a high-temperature environment for a long time, greatly shortening their service life. Alternatively, cooling equipment can be added to lower the operating temperature of the capacitor bank, increasing costs. In addition, traditional cabinet-type group-based automatic switching reactive power compensation devices are inconvenient to install and maintain. Their complex structure and numerous components make the installation process cumbersome, requiring professional personnel to spend a lot of time and effort on debugging and assembly. During maintenance, locating fault points and replacing damaged components are also difficult, increasing maintenance costs and power outage time. Outdoor installations often require the area of ​​several groups, increasing site construction costs.

[0005] In conclusion, developing a compact capacitor reactive power compensation device that is small in size, has good heat dissipation performance, and is easy to install and maintain has important practical significance and market demand. Utility Model Content

[0006] This utility model provides a compact grouped automatic switching reactive power compensation device, which stacks the circuit breakers and reactors in the reactive power compensation device to reduce the footprint and lower the site construction cost.

[0007] According to one aspect of the present invention, a compact group automatic switching reactive power compensation device is provided. The compact group automatic switching reactive power compensation device includes: a disconnecting switch and two compensation branches, each of the compensation branches including: a circuit breaker, a reactor and a capacitor.

[0008] The first end of the disconnecting switch is connected to the high-voltage incoming cable, the second end of the disconnecting switch is connected to the two compensation branches, the circuit breaker is located at the front end of the compensation branch and connected to the reactor, and the reactor is connected to the capacitor.

[0009] Two circuit breakers are stacked one on top of the other, and the two circuit breakers are installed on the same bracket in two layers.

[0010] Two sets of reactors are stacked one on top of the other, and the two sets of reactors are installed on the base in two layers.

[0011] Two sets of capacitors are symmetrically arranged on both sides of the capacitor frame and mounted on a fixed frame.

[0012] Optionally, an isolation bracket is provided below the disconnecting switch of the compact group automatic switching reactive power compensation device, and the disconnecting switch is installed above the isolation bracket.

[0013] Optionally, the compact grouped automatic switching reactive power compensation device also includes: multiple post insulators;

[0014] The two sets of reactors are stacked in the same phase in two layers, and the reactors in the upper and lower layers are separated by the post insulators.

[0015] Each group of reactors consists of three reactors arranged in an equilateral triangle between the circuit breaker and the capacitor. One reactor in each group is positioned closer to the disconnecting switch, while the other two reactors in each group are positioned closer to the capacitor.

[0016] Optionally, the compact group automatic switching reactive power compensation device also includes: at least two incoming busbars;

[0017] The output wires of a set of reactors are connected from the left side of the capacitor frame to the input busbar of a set of capacitors;

[0018] Another set of reactors leads the incoming busbar to the right side of the capacitor frame through the post insulator, and connects to the incoming busbar of another set of capacitors.

[0019] Optionally, each of the compensation branches further includes: a surge arrester;

[0020] The surge arrester is mounted on the fixed frame. The first end of the surge arrester is connected to the reactor and the capacitor, and the second end of the surge arrester is grounded.

[0021] Optionally, each of the compensation branches further includes: a discharge coil;

[0022] The discharge coil is mounted on the fixed frame and connected in parallel across the two ends of the capacitor. The discharge coil is used to provide an unbalanced voltage protection signal for the capacitor.

[0023] Optionally, each of the compensation branches further includes: a current transformer;

[0024] The current transformer is connected between the circuit breaker and the reactor.

[0025] Optionally, the compact group automatic switching reactive power compensation device also includes: a fence;

[0026] The circuit breaker, the reactor, and the capacitor are located inside the fence, the disconnect switch is located outside the fence, and the fence has a movable door on the side near the disconnect switch.

[0027] Optionally,

[0028] A circuit breaker bracket is provided below the circuit breaker, and the two circuit breakers are installed on the circuit breaker bracket in two layers, upper and lower.

[0029] Optionally, the reactor is provided with a reactor base at its bottom;

[0030] The two sets of reactors are installed on the reactor base in two layers, upper and lower.

[0031] The technical solution of this utility model embodiment is structurally reasonable. By combining capacitor banks of the same capacity, and using a two-layer stacked layout for the circuit breaker and reactor, it achieves compact size, good heat dissipation, and convenient installation and maintenance. Furthermore, it simplifies wiring and simplifies the principle. While meeting the functional and performance requirements of conventional capacitor banks, it saves land and materials, resulting in significant economic benefits. This utility model solves the problem that conventional grouped automatic switching reactive power compensation devices often require the area of ​​several groups for outdoor installation, increasing site construction costs. It achieves the effect of reducing land occupation and lowering site construction costs.

[0032] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a conventional group automatic switching reactive power compensation device.

[0035] Figure 2 This is a front view of an existing conventional group automatic switching reactive power compensation device;

[0036] Figure 3 This is a top view of an existing conventional group automatic switching reactive power compensation device;

[0037] Figure 4 This is a schematic diagram of a compact group automatic switching reactive power compensation device according to an embodiment of the present utility model;

[0038] Figure 5 This is a front view of a compact group automatic switching reactive power compensation device according to an embodiment of the present utility model;

[0039] Figure 6 This is a top view of a compact group automatic switching reactive power compensation device provided according to an embodiment of the present utility model. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] When users deploy grouped automatic switching capacitor compensation devices outdoors, there are usually multiple capacitor banks for conventional compensation. Each bank requires an isolating grounding switch, circuit breaker, reactor, capacitor, discharge coil, current transformer, etc. Each bank requires its own space for outdoor deployment. The controller manages the switching of the circuit breaker according to a control strategy, resulting in a large footprint. Some enterprise users do not have enough land in their factory areas to deploy multiple banks of reactive power compensation devices. To meet user needs and minimize the footprint, the grouped automatic switching capacitor compensation device needs to be designed to be compact.

[0043] Let's take two sets of 10kV capacitors with a capacity of 2000kvar + 2000kvar as an example. Figure 1 This is a schematic diagram of a conventional group-based automatic switching reactive power compensation device. Figure 2 This is a front view of an existing conventional group automatic switching reactive power compensation device. Figure 3 This is a top view of an existing conventional group-based automatic switching reactive power compensation device, with a standard 2000kvar + 2000kvar capacitor single-set arrangement as follows: Figure 2 and Figure 3 As shown, the footprint is 6 × (3.5 + 3.5) m. Each capacitor bank is equipped with a set of disconnecting switches, circuit breakers, reactors, capacitor banks, and other equipment, which are arranged separately, so the footprint is relatively large.

[0044] The number of components used in a conventional group-based automatic switching reactive power compensation device is shown in Table 1 below:

[0045] Table 1

[0046]

[0047] To address the aforementioned deficiencies and problems, embodiments of this utility model provide a compact grouped automatic switching reactive power compensation device. Figure 4 This is a schematic diagram of a compact group automatic switching reactive power compensation device according to an embodiment of the present invention. Figure 5 This is a front view of a compact grouped automatic switching reactive power compensation device according to an embodiment of the present invention. Figure 6 This is a top view of a compact grouped automatic switching reactive power compensation device according to an embodiment of the present invention, with reference to... Figure 4 , Figure 5 and Figure 6 The compact group automatic switching reactive power compensation device includes: a disconnecting switch 2 and two compensation branches, each compensation branch including: a circuit breaker 3, a reactor 5 and a capacitor 6;

[0048] The first end of the disconnecting switch 2 is connected to the high-voltage incoming cable 1, and the second end of the disconnecting switch 2 is connected to two compensation branches. The circuit breaker 3 is located at the front end of the compensation branch and is connected to the reactor 5. The reactor 5 is connected to the capacitor 6.

[0049] The two circuit breakers are stacked one on top of the other, and the two circuit breakers are installed on the same bracket in two separate layers.

[0050] Two sets of reactors are stacked one on top of the other, and the two sets of reactors are installed on the base in two layers.

[0051] Two sets of capacitors are symmetrically arranged on both sides of the capacitor frame and mounted on a fixed frame.

[0052] Specifically, two circuit breakers are stacked vertically. Circuit breaker 3 has a single busbar input, and its outgoing lines are distributed across different devices. The primary considerations are ensuring safe energized distances between all equipment, facilitating maintenance, and ensuring convenient operation. Furthermore, maintaining energized distances between different groups of equipment and the busbar is crucial to prevent phase-to-phase short circuits or short circuits between different groups of equipment. Reactor 5 employs a dry-type hollow structure, with different groups of in-phase reactors stacked together. One set of capacitors is located on the right side of the capacitor frame, and another set on the left. The mounting bracket is floor-mounted, improving overall stability and safety. All components are openly arranged for easy maintenance and to address heat dissipation issues.

[0053] The number of components used in the compact group automatic switching reactive power compensation device is shown in Table 2 below:

[0054] Table 2

[0055]

[0056] The component layout of the compact group automatic switching reactive power compensation device is as follows: Figure 5As shown, both sets of capacitors have the same capacity of 2000kvar + 2000kvar, occupying an area of ​​only 6.5 m × 3.5 m. A compact layout is achieved using a fence, a disconnecting switch, two vacuum circuit breakers mounted on a single support in two layers, and two sets of reactors stacked in the same phase in two layers. One set of capacitors is located on the right side of the capacitor frame, and the other on the left side, thus achieving a compact arrangement of the two sets of equipment.

[0057] Table 3 compares the materials used in the compact group automatic switching reactive power compensation device and the conventional group automatic switching reactive power compensation device. The materials used in common parts such as disconnect switches, brackets and fences are also saved, and the floor space is reduced by about 1 / 2.

[0058] Table 3

[0059]

[0060] The technical solution of this utility model embodiment is structurally reasonable. By combining capacitor banks of the same capacity, and using a two-layer stacked layout for the circuit breaker and reactor, it achieves compact size, good heat dissipation, and convenient installation and maintenance. Furthermore, it simplifies wiring and simplifies the principle. While meeting the functional and performance requirements of conventional capacitor banks, it saves land and materials, resulting in significant economic benefits. This utility model solves the problem that conventional grouped automatic switching reactive power compensation devices often require the area of ​​several groups for outdoor installation, increasing site construction costs. It achieves the effect of reducing land occupation and lowering site construction costs.

[0061] Continue to refer to Figure 5 Optionally, the compact group automatic switching reactive power compensation device also includes: busbar 4;

[0062] Busbar 4 is connected between disconnector 2 and circuit breaker 3;

[0063] Specifically, the main function of busbar 4 is to efficiently transmit electrical energy. Busbar 4 can be made of copper and is used to connect various electrical components, such as circuit breaker 3 and disconnector 2, to form a complete electrical circuit, transmitting electrical energy from the power source to various electrical devices. Compared to wires and cables, busbar 4 has a stronger current-carrying capacity, can withstand larger currents, and has lower resistance, resulting in lower energy loss during transmission and greatly improving the transmission efficiency of the power system.

[0064] Continue to refer to Figure 5 Optionally, the compact group automatic switching reactive power compensation device also includes: multiple post insulators 10;

[0065] Two sets of reactors are stacked in the same phase in two layers, and the reactors in the upper and lower layers are separated by post insulators 10.

[0066] Each group of reactors consists of three reactors arranged in an equilateral triangle between the circuit breaker 3 and the capacitor 6. One reactor in each group is located on the side closest to the disconnecting switch 2, while the other two reactors in each group are located on the side closest to the capacitor 6.

[0067] Specifically, the two sets of reactors are stacked in phase, and the stacked reactors are separated by a post insulator 10 with large creepage distance, high strength and high insulation capacity to ensure a safe distance and eliminate potential safety hazards.

[0068] Optionally, the compact group automatic switching reactive power compensation device also includes: at least two incoming busbars;

[0069] The output lines of one reactor are connected from the left side of the capacitor frame to the input busbar of one capacitor.

[0070] Another set of reactors leads the incoming busbar to the right side of the capacitor frame via post insulators, and connects to the incoming busbar of another set of capacitors.

[0071] Specifically, to facilitate the arrangement of the busbars, the outgoing line of one set of reactors is connected to the incoming busbar of one set of capacitors from the left side of the capacitor frame, and the incoming busbar of another set of reactors is led to the right side of the capacitor frame through the post insulator, and connected to the incoming busbar of another set of capacitors.

[0072] By setting up post insulators, it is convenient to connect and fix the incoming busbars, and the spacing between the post insulators is increased to facilitate the wiring of the two sets of parallel capacitors and the two dry-type air-core reactors.

[0073] Continue to refer to Figure 5 Optionally, each compensation branch also includes: a surge arrester 7;

[0074] The surge arrester 7 is mounted on a fixed frame. The first end of the surge arrester 7 is connected to the reactor 5 and the capacitor 6, and the second end of the surge arrester 7 is grounded.

[0075] Specifically, surge arrester 7 is mounted on a fixed frame, which is ground-mounted, improving overall stability and safety. Surge arrester 7 can be a zinc oxide surge arrester, and its installation reduces the risk of lightning strikes.

[0076] Continue to refer to Figure 5 Optionally, each compensation branch may further include: a discharge coil 8;

[0077] The discharge coil 8 is mounted on the fixed frame and connected in parallel across the two ends of the capacitor 6. The discharge coil 8 is used to provide an unbalanced voltage protection signal for the capacitor 6.

[0078] Specifically, the discharge coil 8 is mounted on a fixed frame, which is floor-mounted, improving overall stability and safety. Each unit is equipped with a discharge coil 8, providing a capacitor unbalanced voltage protection signal, which is connected to the control and protection panel to monitor the capacitor bank's operation in real time and protect the capacitors. The discharge coil 8 and capacitor 6 are installed on the same frame but in opposite directions, eliminating potential safety hazards between different units.

[0079] Continue to refer to Figure 4 and Figure 5 Optionally, each compensation branch may also include: a current transformer (TA);

[0080] The current transformer TA is connected between the circuit breaker 3 and the reactor 5.

[0081] Specifically, the protective function of current transformers is crucial. They convert high current into low current, enabling protective equipment to perform accurate measurement and control, and preventing equipment damage due to faults. Current transformers are mainly used to measure and monitor current in circuits. Their core function is to proportionally convert high current into low current, so that measuring instruments, relay protection devices, and other equipment can operate safely and accurately, ensuring the normal operation of the equipment.

[0082] Continue to refer to Figure 5 Optionally, the compact group automatic switching reactive power compensation device also includes: fence 9;

[0083] Circuit breaker 3, reactor 5, and capacitor 6 are placed inside fence 9, and disconnect switch 2 is placed outside fence 9. Fence 9 has a movable door on the side near disconnect switch 2.

[0084] Specifically, during operation, the device is isolated by setting up a fence 9 to reduce the risk of personnel contact. The installation of a movable door makes it easier to locate fault points and replace damaged components during maintenance, reducing maintenance costs and power outage time.

[0085] Optionally, an isolation bracket is provided below the disconnecting switch, and the disconnecting switch is installed above the isolation bracket.

[0086] Optionally, a circuit breaker bracket is provided below the circuit breaker, and the two circuit breakers are installed on the circuit breaker bracket in two layers, upper and lower.

[0087] Specifically, the height of the isolation brackets should be higher than the height of the fence. The isolation brackets and circuit breaker brackets are installed on the ground, which improves the overall stability and safety of the device.

[0088] Optionally, a reactor base is provided at the bottom of the reactor;

[0089] The two sets of reactors are installed on the reactor base in two layers, upper and lower.

[0090] Specifically, the reactor base is the supporting structure for mounting the reactor, mainly used to support the reactor and reduce the impact of electromagnetic interference. Its main characteristics include high mechanical strength, corrosion resistance, good stability, and long service life.

[0091] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A compact group-based automatic switching reactive power compensation device, characterized in that, include: The disconnecting switch and two compensation branches, each of which includes: a circuit breaker, a reactor, and a capacitor; The first end of the disconnecting switch is connected to the high-voltage incoming cable, the second end of the disconnecting switch is connected to the two compensation branches, the circuit breaker is located at the front end of the compensation branch and connected to the reactor, and the reactor is connected to the capacitor. Two circuit breakers are stacked one on top of the other, and the two circuit breakers are installed on the same bracket in two layers. Two sets of reactors are stacked one on top of the other, and the two sets of reactors are installed on the base in two layers. Two sets of capacitors are symmetrically arranged on both sides of the capacitor frame and mounted on a fixed frame.

2. The reactive power compensation device according to claim 1, characterized in that, An isolation bracket is provided below the isolation switch, and the isolation switch is installed above the isolation bracket.

3. The reactive power compensation device according to claim 1, characterized in that, Also includes: Multiple post insulators; The two sets of reactors are stacked in the same phase in two layers, and the reactors in the upper and lower layers are separated by the post insulators. Each group of reactors consists of three reactors arranged in an equilateral triangle between the circuit breaker and the capacitor. One reactor in each group is positioned closer to the disconnecting switch, while the other two reactors in each group are positioned closer to the capacitor.

4. The reactive power compensation device according to claim 3, characterized in that, Also includes: At least two incoming busbars; The output wires of a set of reactors are connected from the left side of the capacitor frame to the input busbar of a set of capacitors; Another set of reactors leads the incoming busbar to the right side of the capacitor frame through the post insulator, and connects to the incoming busbar of another set of capacitors.

5. The reactive power compensation device according to any one of claims 1 to 4, characterized in that, Each of the aforementioned compensation branches also includes: a surge arrester; The surge arrester is mounted on the fixed frame. The first end of the surge arrester is connected to the reactor and the capacitor, and the second end of the surge arrester is grounded.

6. The reactive power compensation device according to any one of claims 1 to 4, characterized in that, Each of the aforementioned compensation branches further includes: a discharge coil; The discharge coil is mounted on the fixed frame and connected in parallel across the two ends of the capacitor. The discharge coil is used to provide an unbalanced voltage protection signal for the capacitor.

7. The reactive power compensation device according to any one of claims 1 to 4, characterized in that, Each of the aforementioned compensation branches also includes a current transformer; The current transformer is connected between the circuit breaker and the reactor.

8. The reactive power compensation device according to any one of claims 1 to 4, characterized in that, Also includes: Fence; The circuit breaker, the reactor, and the capacitor are located inside the fence, the disconnect switch is located outside the fence, and the fence has a movable door on the side near the disconnect switch.

9. The reactive power compensation device according to any one of claims 1 to 4, characterized in that, A circuit breaker bracket is provided below the circuit breaker, and the two circuit breakers are installed on the circuit breaker bracket in two layers, upper and lower.

10. The reactive power compensation device according to any one of claims 1 to 4, characterized in that, The reactor is provided with a reactor base at its bottom; The two sets of reactors are installed on the reactor base in two layers, upper and lower.

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