Electrode taking column capacitor

Abstract

The utility model discloses an electrode-taking column capacitor, relates to the field of electronic components, and is used for solving the problems that stray capacitance of an existing electrode-taking column capacitor affects electric field distribution of the capacitor, the service life of the capacitor is affected by partial discharge and the like. Comprising a capacitor bank, the input end and the output end of which are electrically connected with a first insert and a second insert respectively; the first shielding net is positioned between the capacitor bank and the first insert; and the second shielding net is positioned between the capacitor bank and the second insert.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electronic components, more particularly to a kind of electrode pillar capacitor. BACKGROUND

[0002] Capacitors play an important role in power systems and electronic devices. However, during the operation of capacitors, partial discharge (PD) is a common problem that can affect the performance and life of capacitors. Partial discharge is usually caused by uneven electric field distribution, external electromagnetic interference and other factors. The existing capacitor structure has certain limitations in suppressing partial discharge, and there is an urgent need for a capacitor structure that can effectively improve the PD performance.

[0003] The current capacitor structure as shown in Figure 1 includes three 600pf capacitors and one 1650pf capacitor. The four capacitors are connected in parallel by tinned copper wires to form a capacitor bank 101. The two ends are respectively welded with a first insert 201 and a second insert 202. The outer side of the capacitor bank, the first insert and the second insert is connected with external components. The external components, the first insert, the second insert and the capacitor bank are poured with epoxy resin. Figure 1 The capacitor shown in the figure is used as a pole for taking electricity, which can meet the needs of customers, but the PD level is low. Because in the environment around the capacitor, there are various conductors and dielectrics, which will form stray capacitance between them and the capacitor. These stray capacitances will affect the electric field distribution of the capacitor. During use, the life of the product is greatly reduced due to the problem of partial discharge; at the same time, because of the low pass rate in the production process of the above-mentioned product, the problem of high production cost is caused. SUMMARY

[0004] The utility model embodiment provides a kind of electrode pillar capacitor for taking electricity to solve the problem that existing electrode pillar capacitor for taking electricity exists stray capacitance and can affect the electric field distribution of capacitor, and the life of capacitor is influenced by partial discharge.

[0005] The utility model embodiment provides a kind of electrode pillar capacitor for taking electricity, which includes:

[0006] The capacitor bank is electrically connected to the first insert and the second insert at the input and output ends, respectively.

[0007] The first shielding net is located between the capacitor bank and the first insert.

[0008] The second shielding net is located between the capacitor bank and the second insert.

[0009] Preferably, the capacitor bank includes four capacitors.

[0010] Preferably, the first shielding net and the second shielding net are of the same shape; both are circular and have a through hole in the middle.

[0011] Preferably, the diameter of the first shielding net is greater than the length of the long side and the length of the short side of the vertical section of the capacitor included in the capacitor group; the diameter of the second shielding net is greater than the length of the long side and the length of the short side of the vertical section of the capacitor included in the capacitor group.

[0012] Preferably, the edge of the first shielding net is located at a distance of 1 / 2 between the edge of the capacitor included in the capacitor group and the shell, and the edge of the second shielding net is located at a distance of 1 / 2 between the edge of the capacitor included in the capacitor group and the shell.

[0013] Preferably, the distance between the first shielding net and the capacitor group is greater than 1 / 2 of the distance between the capacitor group and the first insert.

[0014] The distance between the second shielding net and the capacitor group is greater than 1 / 2 of the distance between the capacitor group and the second insert.

[0015] Preferably, the first shielding net and the second shielding net are both woven by metal wires.

[0016] Preferably, the capacitor group, the first shielding net, the second shielding net, the first insert and the second insert are cast in an epoxy resin in a circular shell.

[0017] The electrode-taking capacitor provided in this embodiment includes: a capacitor bank, the input and output terminals of which are electrically connected to a first insert and a second insert, respectively; a first shielding mesh located between the capacitor bank and the first insert; and a second shielding mesh located between the capacitor bank and the second insert. When external electromagnetic waves reach the first and second shielding meshes, induced currents are generated on the first and second shielding meshes. These induced currents generate a reverse electromagnetic field that cancels out the external electromagnetic field, thereby preventing the external electromagnetic field from entering the capacitor. In other words, by adding the first and second shielding meshes, an equipotential surface is essentially created at the edge of the capacitor bank. For the capacitor bank, the presence of the equipotential surface constrains the direction of the electric field lines, making them more perpendicular and parallel to the plates, reducing the bending and concentration of the electric field lines. From the perspective of electric field theory, according to Gauss's law and the relationship between electric field strength and potential, the presence of the first and second shielding meshes changes the boundary conditions of the electric field, making the potential distribution inside the capacitor more uniform, and thus making the electric field strength distribution more uniform. A uniform electric field distribution means that there are no areas with excessively high local electric field strength inside the capacitor bank. Since partial discharge usually occurs in local areas with excessively high electric field strength, optimizing the electric field distribution can effectively reduce the phenomenon of partial discharge. Furthermore, the tapping post capacitor with the first and second shielding meshes has a more uniform electric field distribution, and its partial discharge level can be improved to 20KV. At the same time, it can also increase the service life of the capacitor. The tapping post capacitor provided in this embodiment has a reasonable structural design and simple manufacturing process, which increases the product qualification rate from 83% to 98% and reduces production costs. By adding a shielding mesh to improve the partial discharge level, it is possible to adapt to the application needs of capacitors under different working environments and voltage levels, which greatly expands the market application field. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0019] Figure 1 This is a schematic diagram of the electrode post capacitor structure provided in the prior art;

[0020] Figure 2 A schematic diagram of the electrode post capacitor structure provided for this utility model embodiment;

[0021] Figure 3 A schematic diagram of the shielding mesh structure provided in an embodiment of this utility model;

[0022] Figure 4 A three-dimensional structure schematic diagram of the electrode column capacitor is provided in the embodiment of the present application.

[0023] Among them, 101-capacitor group, 201-first insert, 202-second insert, 301-first shielding net, 302-second shielding net. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] Figure 2 A structure schematic diagram of the electrode column capacitor is provided in the embodiment of the present application. Figure 3 A structure schematic diagram of the shielding net is provided in the embodiment of the present application. Figure 4 A three-dimensional structure schematic diagram of the electrode column capacitor is provided in the embodiment of the present application. Hereinafter, the electrode column capacitor provided in the embodiment of the present application will be described in detail with the following Figures 2 to 4 as an example.

[0026] As shown in Figure 2 the electrode column capacitor mainly comprises a capacitor group 101, a first shielding net 301, a second shielding net 302, a first insert 201 and a second insert 202.

[0027] Specifically, the capacitor group comprises four capacitors, the four capacitors are arranged in a parallel manner, the capacitor group composed of the four capacitors is mainly responsible for storing electric charge; the four capacitors are connected through tinned copper wires, here the tinned copper wires play a role of conducting current; further, the input end of the capacitor group composed of the four capacitors is electrically connected with the first insert, and the output end is electrically connected with the second insert, the first insert and the second insert are used for fixing the capacitor group on one hand, and can be used as an interface for external connection on the other hand.

[0028] In the embodiment of the utility model, in order to optimize electric field distribution, reduce partial discharge phenomenon, set up first shielding net between first insert and input end of capacitor group, set up second shielding net between second insert and output end of capacitor group. Through set up first shielding net and second shielding net, can constrain the trend of electric field line, make electric field line more perpendicular and parallel to polar plate, reduce the bending and concentration of electric field line, thereby make the electric field distribution in capacitor more uniform. Further, set up the electrode column capacitor of first shielding net and second shielding net, its electric field distribution is more uniform, its partial discharge level can improve to 20KV partial discharge, simultaneously, can also increase the service life of capacitor, the electrode column capacitor provided in this embodiment has reasonable structure design and simple manufacturing process, makes product qualified rate improve from 83% to 98%, reduces production cost.

[0029] Exemplarily, the electrode column capacitor provided by the embodiment of the utility model has the same shape of the first shielding net and the second shielding net, both are circular, and a through hole is arranged in the middle, as shown in Figure 3 It should be noted that the first shielding net and the second shielding net provided by the embodiment of the utility model are both woven by metal wires, preferably, the first shielding net and the second shielding net are woven by copper wires with good conductivity.

[0030] However, in actual application, the size of the first shielding net and the second shielding net should completely cover the capacitor, that is, the diameter of the first shielding net and the second shielding net needs to be greater than the diameter of the capacitor, but in this embodiment, as shown in Figure 4 The setting mode of the first shielding net is different from the setting mode of the cylindrical capacitor, therefore, the diameter of the first shielding net is required to be greater than the length of the long side and the length of the short side of the vertical section of the capacitor included in the capacitor group; and the diameter of the second shielding net is greater than the length of the long side and the length of the short side of the vertical section.

[0031] Through the above setting, the size of the first shielding net and the second shielding net should completely cover the capacitor. At the same time, the first shielding net and the second shielding net need to maintain a proper distance from the shell of the electrode column capacitor and the capacitor group, so as to well achieve the effect of reducing partial discharge, in this embodiment, the edge of the first shielding net is located at the distance of 1 / 2 between the edge of the capacitor included in the capacitor group and the shell of the electrode column capacitor, and the edge of the second shielding net is located at the distance of 1 / 2 between the edge of the capacitor included in the capacitor group and the shell of the electrode column capacitor.

[0032] Further, after adding the first shielding net and the second shielding net, in order to effectively shield external interference, the first shielding net and the second shielding net should be placed in a suitable position. If the first shielding net and the second shielding net are too close to the plates of the capacitor bank, the original electric field distribution inside the capacitor can be affected. Therefore, the distance between the first shielding net and the input end of the capacitor bank and the distance between the second shielding net and the output end of the capacitor bank should be appropriate, so as to well achieve the effect of reducing partial discharge. In this embodiment, the distance between the first shielding net and the input end of the capacitor bank is greater than 1 / 2 of the distance between the input end of the capacitor bank and the first insert, and correspondingly, the distance between the second shielding net and the output end of the capacitor bank is greater than 1 / 2 of the distance between the capacitor bank and the second insert.

[0033] It should be noted that the electrode column capacitor provided by the embodiment of the utility model includes the capacitor bank, the first shielding net, the second shielding net, the first insert and the second insert which are all cast in the circular shell by epoxy resin.

[0034] The electrode column capacitor provided by the embodiment of the utility model comprises: a capacitor bank, an input end and an output end of the capacitor bank are electrically connected with a first insert and a second insert respectively; a first shielding net is located between the capacitor bank and the first insert; and a second shielding net is located between the capacitor bank and the second insert. When external electromagnetic waves reach the first shielding net and the second shielding net, induced current is generated on the first shielding net and the second shielding net, the induced current generates a reverse electromagnetic field which counteracts the external electromagnetic field, thereby preventing the external electromagnetic field from entering the capacitor. That is, after the first shielding net and the second shielding net are added, the first shielding net and the second shielding net are equivalent to establishing an equipotential surface at the edge of the capacitor bank. For the capacitor bank, the existence of the equipotential surface can constrain the direction of the electric field lines, so that the electric field lines are more perpendicular and parallel to the plates, reducing the bending and concentration of the electric field lines. From the electric field theory, according to Gauss theorem and the relationship between electric field intensity and electric potential, the existence of the first shielding net and the second shielding net changes the boundary conditions of the electric field, so that the electric potential distribution inside the capacitor is more uniform, and the electric field intensity distribution is more uniform. Uniform electric field distribution means that there is no area with excessively high local electric field intensity inside the capacitor bank, and partial discharge usually occurs in the local area with excessively high electric field intensity. Therefore, by optimizing the electric field distribution, the partial discharge phenomenon can be effectively reduced. Further, the electrode column capacitor provided by the embodiment of the utility model has more uniform electric field distribution, the partial discharge level can be improved to 20KV, and the service life of the capacitor can be increased. The electrode column capacitor provided by the embodiment has reasonable structure design and simple manufacturing process, so that the product qualification rate is improved from 83% to 98%, and the production cost is reduced. After the shielding net is installed to improve the partial discharge level, the capacitor can adapt to the application requirements of capacitors in different working environments and voltage grades, greatly expanding the market application field.

[0035] While the preferred embodiments of the application have been described, those skilled in the art will recognize that many modifications and variations of this application are possible. Accordingly, the intended scope of the application is indicated by the following claims and their equivalents.

[0036] It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover the modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A tapped post capacitor, comprising: The capacitor group is electrically connected with the first and second inserts respectively at its input and output ends. The first shielding net is located between the capacitor group and the first insert. The second shielding net is located between the capacitor group and the second insert. The capacitor group comprises four capacitors.

2. The pin-electrode condenser according to claim 1, wherein The first and second shielding nets are circular and have a through hole in the middle.

3. The pin-electrode condenser according to claim 1, wherein The diameter of the first shielding net is greater than the length of the long side and the length of the short side of the vertical section of the capacitors comprised in the capacitor group.

4. The pin-electrode condenser according to claim 3, wherein The diameter of the second shielding net is greater than the length of the long side and the length of the short side of the vertical section of the capacitors comprised in the capacitor group.

5. The pin-electrode condenser according to claim 3, wherein The edge of the first shielding net is located at a distance of 1 / 2 between the edge of the capacitors comprised in the capacitor group and the shell.

6. The pin-electrode condenser according to claim 3, wherein The distance between the first shielding net and the capacitor group is greater than 1 / 2 of the distance between the capacitor group and the first insert. The distance between the second shielding net and the capacitor group is greater than 1 / 2 of the distance between the capacitor group and the second insert.

7. The pin-electrode condenser according to claim 3, wherein The first and second shielding nets are both made of metal wires.

8. The pin-electrode condenser according to claim 1, wherein The capacitor group, the first and second shielding nets, the first and second inserts are cast in an epoxy resin in a circular shell.

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