SPF series high-voltage parallel built-in fuse type capacitor device

Abstract

The utility model discloses an SPF series high-voltage parallel built-in fuse type capacitor device, which belongs to the technical field of capacitors, and comprises a shell and two bushings arranged on the surface of the shell, a plurality of capacitor units are arranged in the shell, each capacitor unit is composed of a fuse and an independent capacitor, a discharge resistor is arranged in the shell, and the discharge resistor is connected with the two bushings. A capacitor element is installed in the shell, the capacitor element is formed by winding a metallized polypropylene film serving as a dielectric medium and an aluminum foil, two aluminum guide plates are installed in the capacitor element, the shell is filled with high-temperature synthetic heat conduction oil, and hanging lugs are fixed to the outer walls of the two sides of the shell. According to the SPF series high-voltage parallel capacitor device with the built-in fuse, normal operation of a power system is maintained under the poor power supply condition, meanwhile, loss of the capacitor is reduced, and stability and reliability of products are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of capacitor technology, specifically relating to an SPF series high-voltage parallel internal fuse type capacitor device. Background Technology

[0002] A capacitor, often simply called a capacitor, is a device that stores electrical charge. Capacitors are among the most widely used electronic components in electronic devices, extensively applied in circuits for DC blocking and AC switching, coupling, bypassing, filtering, tuning circuits, energy conversion, and control. High-voltage parallel capacitors are suitable for 50Hz and 60Hz power frequency AC power systems. High-voltage parallel capacitors are used to provide capacitive reactive power to the power network, improve the power factor, reduce line losses, and improve power quality, thereby increasing the efficiency of power generation and supply equipment.

[0003] In traditional high-voltage parallel capacitors, the fuses used to protect the capacitors are externally connected to the outside of the high-voltage parallel capacitor's outgoing bushing. However, the internal fuses of the high-voltage parallel capacitors are not protected. If one of the parallel capacitor units inside the high-voltage parallel capacitor fails, its external fuse will trip. The fault is inconvenient to troubleshoot, and the entire high-voltage parallel capacitor needs to be replaced immediately to ensure the normal operation of high-voltage power transmission and transformation. The replacement work is complicated and increases the cost of use. Utility Model Content

[0004] The purpose of this utility model is to provide an SPF series high-voltage parallel capacitor device with internal fuse, in order to solve the problem mentioned in the background art that if one of the parallel capacitor units inside the high-voltage parallel capacitor fails, its external fuse will activate, making it inconvenient to troubleshoot the fault. The entire high-voltage parallel capacitor needs to be replaced immediately to ensure the normal operation of high-voltage power transmission and transformation, and the replacement work is complicated, increasing the cost of use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an SPF series high-voltage parallel internally connected fuse-type capacitor device, comprising a housing and two bushings mounted on the surface of the housing, wherein multiple capacitor units are installed inside the housing, each capacitor unit consisting of a fuse and an independent capacitor, a discharge resistor is installed inside the housing, and a capacitor element is installed inside the housing, wherein the capacitor element is formed by winding a metallized polypropylene film as a dielectric with aluminum foil, and two aluminum conductive plates are installed inside the capacitor element.

[0006] In a further embodiment, the outer shell is filled with high-temperature synthetic heat-conducting oil, and hooks are fixed to both outer walls of the outer shell.

[0007] In a further embodiment, two mounting holes are symmetrically provided on the ear, and a nameplate is fixed to one side of the outer wall of the ear.

[0008] In a further embodiment, the capacitor element employs a salient electrode folding technique, and the welding between the aluminum foil and the aluminum conductor plate is performed using a rotary soldering iron technique.

[0009] In a further embodiment, each of the two sleeves is equipped with a terminal block at its top, and the top cover of the housing, the sleeves, and the terminal blocks are all integrally rolled.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] The SPF series high-voltage parallel capacitor bank with internal fuse has a fuse installed in each capacitor unit. When the line or individual capacitors are abnormal, the capacitors will not explode, thus providing safety and explosion protection. At the same time, when a single capacitor unit fails, its internal fuse will melt immediately, thereby isolating the fault. The entire capacitor can then continue to work normally, reducing subsequent maintenance time and costs.

[0012] The capacitor element is coated with high-temperature synthetic heat-conducting oil on all sides, which provides good protection and excellent partial discharge extinguishing capability, greatly reducing capacitor loss.

[0013] The use of a rolled, integrated housing cover, sleeve, and terminals solves the problem of oil leakage in capacitor sleeves. This SPF series high-voltage parallel internal fuse-type capacitor device maintains the normal operation of the power system under poor power supply conditions, while reducing capacitor losses and ensuring product stability and reliability. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in 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 utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of this utility model in a partially cut-away state;

[0017] Figure 3 This is the front view of the present invention;

[0018] Figure 4 This is a cross-sectional view of the present invention;

[0019] Figure 5 This is a schematic diagram of the structure of the capacitor element of this utility model.

[0020] In the diagram: 1. Outer casing; 2. Sleeve; 3. Fuse; 4. Discharge resistor; 5. Capacitor element; 6. Aluminum foil; 7. Aluminum conductor plate; 8. Lug; 9. Nameplate; 10. Independent capacitor. Detailed Implementation

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0022] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0023] This utility model provides, for example Figure 1-5 The SPF series high-voltage parallel internal fuse type capacitor device shown includes a housing 1 and two bushings 2 mounted on the surface of the housing 1. The top of each bushing 2 is equipped with a terminal. The top cover of the housing 1, the bushings 2 and the terminal are all rolled into one piece. The rolled-in one-piece design of the top cover of the housing 1, the bushings 2 and the terminal solves the problem of oil leakage of the capacitor bushings 2. The surface of the housing 1 is shot-blasted to increase the adhesion of the paint on the surface of the housing 1 and make the surface less prone to rust.

[0024] Multiple capacitor units are installed inside the outer casing 1. Each capacitor unit consists of a fuse 3 and an independent capacitor 10. The capacitor units are connected in parallel, and the fuse 3 is connected in series with the independent capacitor 10. A discharge resistor 4 is installed inside the outer casing 1. Each capacitor unit has a fuse 3 installed inside. When the circuit or individual capacitors are abnormal, the capacitors are prevented from bursting, thus providing a safety and explosion-proof protection. At the same time, when a single capacitor unit fails, the fuse 3 inside it will immediately melt, thereby isolating the fault. Then the entire capacitor can continue to work normally, reducing subsequent maintenance time and maintenance costs.

[0025] The outer casing 1 houses a capacitor element 5, which is formed by winding a metallized polypropylene film as the dielectric with an aluminum foil 6. Two aluminum conductor plates 7 are installed inside the capacitor element 5. The capacitor element 5 uses a salient electrode folding technology. The welding between the aluminum foil 6 and the aluminum conductor plates 7 is done using a rotary soldering iron technology, which makes the welding between the aluminum foil 6 and the lead wire more secure, the contact resistance lower, and the welding very uniform. This can greatly reduce the probability of failure caused by poor welding, reduce capacitor loss, and ensure product quality stability and reliability.

[0026] The outer casing 1 is filled with high-temperature synthetic heat-conducting oil. The capacitor element 5 is covered with high-temperature synthetic heat-conducting oil, which has a good protective function and excellent partial discharge extinguishing ability, greatly reducing the loss of the capacitor. The outer walls on both sides of the outer casing 1 are welded with lugs 8. Two mounting holes are symmetrically opened on the lugs 8. A nameplate 9 is fixed on one side of the outer wall of the lugs 8, and the nameplate 9 records the information of the capacitor.

[0027] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The control method of this utility model is through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0028] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Working principle:

[0030] The SPF series high-voltage parallel capacitor with internal fuse is designed for use. When the capacitor is installed in a suitable location, if an abnormality occurs in the line or an individual capacitor, the fuse 3 installed in each capacitor unit ensures that the capacitor will not explode, thus providing safety and explosion protection. At the same time, if a single capacitor unit fails, its internal fuse 3 will immediately melt, thereby isolating the fault, and the entire capacitor can continue to work normally, reducing subsequent maintenance time and costs.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An SPF series high-voltage parallel internally connected fuse-type capacitor device, comprising a housing (1) and two bushings (2) mounted on the surface of the housing (1), characterized in that: Multiple capacitor units are installed inside the housing (1). Each capacitor unit consists of a fuse (3) and an independent capacitor (10). A discharge resistor (4) is installed inside the housing (1). A capacitor element (5) is installed inside the housing (1). The capacitor element (5) is formed by winding a metallized polypropylene film as a dielectric with an aluminum foil (6). Two aluminum conductors (7) are installed inside the capacitor element (5).

2. The SPF series high-voltage parallel internal fuse type capacitor device according to claim 1, characterized in that: The outer shell (1) is filled with high-temperature synthetic heat-conducting oil, and the outer walls on both sides of the outer shell (1) are fixed with hanging ears (8).

3. The SPF series high-voltage parallel internal fuse type capacitor device according to claim 2, characterized in that: Two mounting holes are symmetrically opened on the ear (8), and a nameplate (9) is fixed on one side of the outer wall of the ear (8).

4. The SPF series high-voltage parallel internal fuse type capacitor device according to claim 1, characterized in that: The capacitor element (5) uses a salient electrode folding technique inside, and the welding between the aluminum foil (6) and the aluminum conductor plate (7) uses a rotary soldering iron technique.

5. The SPF series high-voltage parallel internal fuse type capacitor device according to claim 1, characterized in that: Both of the sleeves (2) are equipped with terminals on their tops, and the top cover of the housing (1), the sleeves (2) and the terminals are all integrally rolled.

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