Three-phase low-loss compensation capacitor with reduced installation space

Abstract

The utility model discloses a three -phase low loss compensation capacitor of reducing installation space belongs to capacitor technical field, including the shell, be provided with capacitor unit group in the shell, capacitor unit group includes first capacitor unit, second capacitor unit and third capacitor unit, and capacitor unit is formed by the winding of metallized polypropylene film on the core rod, capacitor unit group is provided with at least one first terminal, second terminal and third terminal for connecting external three -phase power supply, capacitor unit group is connected to first terminal, second terminal and third terminal through a plurality of internal connecting pieces to triangle connection method, thereby realizing three -phase reactive power compensation, the utility model discloses three identical capacitor units are integrated in a shell, and are connected with triangle connection method.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and in particular to a three-phase low-loss compensation capacitor that reduces installation space. Background Technology

[0002] Since humans began using electricity in the early 19th century, capacitors, as important electronic components for the effective management and distribution of electrical energy, have undergone continuous innovation and development. In recent years, thanks to rapid technological progress and national policy support and promotion of new energy sources, capacitor technology has developed rapidly.

[0003] In the field of large industrial loads and three-phase power systems, a new type of three-phase capacitor has been successfully developed and put into application in order to achieve efficient and balanced reactive power compensation and reduce line losses and electricity costs.

[0004] In the application of three-phase systems, the use of three independent single-phase capacitors to compensate for the three-phase balance system has gradually shown its inability to meet market demands. This is because the slight capacitance difference between the single-phase capacitors leads to an imbalance in the three-phase compensation, which in turn has an adverse effect on the power quality of the system. In addition, the method of assembling a three-phase system using multiple single-phase capacitors also has many limitations, such as large space occupation, complex internal connection circuits, a large number of connection points and independent components, which increases the potential fault points. At the same time, the overall equivalent series resistance and equivalent series inductance are relatively high, which further limits the optimization of system performance. Utility Model Content

[0005] The purpose of this invention is to integrate three identical capacitor units into a single housing and connect them in a delta configuration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a three-phase low-loss compensation capacitor that reduces installation space, comprising a housing, wherein a capacitor unit group is provided inside the housing, the capacitor unit group comprising a first capacitor unit, a second capacitor unit and a third capacitor unit, wherein the capacitor unit is formed by winding a metallized polypropylene film onto a core rod. The capacitor unit group is provided with at least one first terminal, a second terminal, and a third terminal for connecting to an external three-phase power supply; The capacitor unit group is connected to the first terminal, the second terminal and the third terminal in a delta connection through multiple internal connectors, thereby realizing three-phase reactive power compensation.

[0007] As a further description of the above technical solution: the capacitance value and equivalent series resistance of the capacitor unit group are kept consistent with each other to ensure that the first terminal, the second terminal and the third terminal receive consistent compensation.

[0008] As a further description of the above technical solution: the internal connector includes at least one first connecting piece for connecting the first capacitor unit and the second capacitor unit.

[0009] As a further description of the above technical solution: the internal connector includes at least one second connecting piece for connecting the second capacitor unit and the third capacitor unit.

[0010] As a further description of the above technical solution: the internal connector includes at least one third connecting piece for connecting the third capacitor unit and the first capacitor unit.

[0011] As a further description of the above technical solution: the first connecting piece, the second connecting piece and the third connecting piece have sufficient cross-sectional area to carry the system operating current, and the welding points at all connections are firm and reliable.

[0012] As a further description of the above technical solution: the capacitor unit group is provided with PET film A, PET film B, PET film C and PET film D.

[0013] As a further description of the above technical solution: the outer casing is fitted with several vertical rods, the outer casing is fixed with threaded rods, and the top of the outer casing is fixed with multiple leads.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: The integrated design significantly reduces installation space and overall weight. With internal components pre-connected, external wiring is simpler, and installation is more efficient. Furthermore, the design reduces capacitor components and connection points, effectively lowering the risk of failure and significantly improving overall system reliability. The device integrates three identical capacitor units, ensuring highly consistent capacitance values ​​and equivalent series resistance. This design enables comprehensive and balanced compensation at the three-phase input terminals, maximizing system power factor optimization, reducing total line current and energy consumption, and improving operating efficiency. Attached Figure Description

[0015] Figure 1 This diagram shows the internal structure of the capacitor of this invention. Figure 2 A cross-sectional view of the housing of this utility model is shown.

[0016] Legend: 10. Housing; 11. Lead wire; 12. Vertical rod; 13. Threaded rod; 14. Metallized polypropylene film; 15. PET film A; 16. PET film B; 17. PET film C; 18. PET film D; 19. Core rod; 20. First connecting piece; 21. Second connecting piece; 22. Third connecting piece; 23. First terminal; 24. Second terminal; 25. Third terminal. Detailed Implementation

[0017] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-2 This utility model provides a technical solution: a three-phase low-loss compensation capacitor that reduces installation space. Its core is to integrate the capacitor unit group into a housing 10 and pre-complete the internal delta connection, thereby achieving the purpose of compact structure and simple wiring.

[0019] The housing 10 is used to house and protect all electrical components inside it, and multiple leads 11 are fixed on its top to enable external electrical connection. The housing 10 is provided with components for structural support and positioning, such as several embedded vertical rods 12 and fixed threaded rods 13, which are used to improve the overall mechanical strength.

[0020] The capacitor unit group integrated inside the housing 10 includes a first capacitor unit, a second capacitor unit, and a third capacitor unit. These capacitor units are the core components for realizing three-phase compensation. To ensure the balance of three-phase compensation, the electrical parameters of the first capacitor unit, the second capacitor unit, and the third capacitor unit are completely consistent during the design. Specifically, their capacitance values ​​and equivalent series resistances are the same.

[0021] The capacitor unit assembly is formed by winding a metallized polypropylene film 14 onto a core rod 19, with the core rod 19 serving as the central structure for supporting and fixing the capacitor unit.

[0022] The capacitor unit group is equipped with PET film A15, PET film B16, PET film C17 and PET film D18.

[0023] The core of this implementation lies in the electrical connection method of the capacitor unit group inside the capacitor.

[0024] As attached Figure 1As shown, this capacitor unit group forms a closed electrical circuit through three internal connecting pieces. Specifically, the first connecting piece 20 connects the third capacitor unit to the first capacitor unit; the second connecting piece 21 connects the first capacitor unit to the second capacitor unit; and the third connecting piece 22 connects the second capacitor unit to the third capacitor unit.

[0025] The capacitor is connected to an external three-phase power supply (L1, L2, L3 phase lines) through its three external terminals, which are respectively connected to the three nodes of the delta connection.

[0026] The first terminal 23 is connected to the node formed by the first connecting piece 20, that is, the connection point between the first capacitor unit and the third capacitor unit; the second terminal 24 is connected to the node formed by the second connecting piece 21, that is, the connection point between the first capacitor unit and the second capacitor unit; the third terminal 25 is connected to the node formed by the third connecting piece 22, that is, the connection point between the second capacitor unit and the third capacitor unit.

[0027] When an external three-phase power supply is connected to the capacitor through the first terminal 23, the second terminal 24 and the third terminal 25, the current flows into the internally preset delta capacitor network, thereby achieving synchronous and balanced reactive power compensation for the three-phase power grid.

[0028] The key to the success of this implementation plan lies in ensuring a high degree of consistency in capacitance value and equivalent series resistance among the capacitor units, which constitutes the basic condition for achieving three-phase power balance compensation.

[0029] The first connecting piece 20, the second connecting piece 21, and the third connecting piece 22 should be made of materials with excellent electrical conductivity and thermal stability, such as copper or aluminum with high conductivity. At the same time, they should be ensured to have sufficient cross-sectional area to safely carry the rated operating current. All internal welding points, as marked with thick black dots in the figure, must be firmly welded and there should be no false welding or poor contact to avoid local overheating or open circuit, thereby ensuring the reliability and service life of the capacitor in long-term operation.

[0030] By adopting the above-mentioned integration and connection method, this capacitor has the following significant advantages compared to the traditional structure composed of three independent single-phase capacitors: the integrated vertical stacked compact structure significantly reduces the floor space and volume required for installation; the internal complex delta connection design allows users to connect only the phase wires of the three-phase power supply to the three terminals during on-site installation, simplifying wiring operations and effectively reducing the possibility of wiring errors; at the same time, the internal integrated connection method reduces the number of external connection points and related accessories, thereby reducing the risk of failure caused by loose or poor contact of external connections.

[0031] Furthermore, integrating three capacitor units with highly consistent parameters into the same housing 10 can effectively eliminate the three-phase compensation imbalance problem caused by parameter differences that may occur when using three independent single-phase capacitors, which helps to improve the power quality of the system. At the same time, the compact internal connection design helps to reduce the overall equivalent series resistance and equivalent series inductance, thereby reducing the energy consumption of the capacitor itself and reducing the total line current.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A three-phase low-loss compensation capacitor with reduced installation space, comprising a housing (10), characterized in that: The outer shell (10) is provided with a capacitor unit group, which includes a first capacitor unit, a second capacitor unit and a third capacitor unit. The capacitor unit is formed by winding a metallized polypropylene film (14) onto a mandrel (19). The capacitor unit group is provided with at least one first terminal (23), a second terminal (24) and a third terminal (25) for connecting to an external three-phase power supply; The capacitor unit group is connected to the first terminal (23), the second terminal (24) and the third terminal (25) in a delta connection through multiple internal connectors, thereby realizing three-phase reactive power compensation.

2. A three-phase low-loss compensation capacitor with reduced installation space according to claim 1, characterized in that: The capacitance value and equivalent series resistance of the capacitor unit group are kept consistent with each other to ensure that the first terminal (23), the second terminal (24) and the third terminal (25) receive consistent compensation.

3. A three-phase low-loss compensation capacitor with reduced installation space according to claim 1, characterized in that: The internal connector includes at least one first connecting piece (20) for connecting the first capacitor unit and the second capacitor unit.

4. A three-phase low-loss compensation capacitor with reduced installation space according to claim 3, characterized in that: The internal connector includes at least one second connecting piece (21) for connecting the second capacitor unit and the third capacitor unit.

5. A three-phase low-loss compensation capacitor with reduced installation space according to claim 4, characterized in that: The internal connector includes at least one third connecting piece (22) for connecting the third capacitor unit and the first capacitor unit.

6. A three-phase low-loss compensation capacitor with reduced installation space according to claim 5, characterized in that: The first connecting piece (20), the second connecting piece (21) and the third connecting piece (22) have sufficient cross-sectional area to carry the system operating current, and the welding points at all connections are firm and reliable.

7. A three-phase low-loss compensation capacitor with reduced installation space according to claim 1, characterized in that: The capacitor unit group is provided with PET film A (15), PET film B (16), PET film C (17) and PET film D (18).

8. A three-phase low-loss compensation capacitor with reduced installation space according to claim 1, characterized in that: The outer casing (10) is fitted with several vertical rods (12), the outer casing (10) is fixed with threaded rods (13), and the top of the outer casing (10) is fixed with multiple leads (11).

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