Dry-type DC support capacitor
By using an insulating partition in the DC support capacitor to separate the storage cavity and make the conductor current direction opposite, the problem of high inductance is solved, the effect of high withstand voltage, high current and low inductance is achieved, and the stability and reliability of the converter are improved.
Patent Information
- Application Number
- CN202510709822.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-29
- Publication Date
- 2025-07-11
AI Technical Summary
The existing DC support capacitors have high inductance, which affects the stability and reliability of the converter.
An insulating partition is used to separate the receiving cavity into two intervals, the first and second cores are connected in series through the conductor, and the current direction of the conductor is opposite to offset the magnetic field and thereby reduce the inductance.
It achieves a high withstand voltage and a large withstand current, while reducing the inductance and improving the stability and reliability of the converter.
Smart Images
Figure CN120299908A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of capacitors, and particularly to a dry-type DC support capacitor. Background Art
[0002] DC support capacitors are key components of converters and are widely used in the fields of new energy, rail transit, and smart grids. Currently, with the development of power electronics technology, converters adopt three-level and multi-level structures, which have a series effect on the inside of a single DC support capacitor, resulting in a relatively high rated voltage and large current in use, increasing the inductance of the DC support capacitor. The increase in inductance will affect the stability and reliability of the converter. Therefore, there is a need to further reduce the inductance of DC support capacitors. Summary of the Invention
[0003] The object of the present invention is to provide a dry-type DC support capacitor with high voltage withstand and large current withstand, and reduced inductance.
[0004] To achieve the above object, the present invention provides a dry-type DC support capacitor, comprising:
[0005] A housing having a receiving cavity and an insulating partition, the insulating partition dividing the receiving cavity into a first section and a second section;
[0006] A terminal assembly mounted on the housing, the terminal assembly including a first terminal, a second terminal, and a third terminal;
[0007] A first core disposed in the first section;
[0008] A second core disposed in the second section; and
[0009] A conductor assembly disposed in the receiving cavity, the conductor assembly including a first conductor, a second conductor, and a third conductor distributed from outside to inside. The first conductor is used for electrically connecting the first terminal and the input end of the first core, the second conductor is used for electrically connecting the output end of the first core and the input end of the second core, the third conductor is used for electrically connecting the output end of the second core and the third terminal, and the second terminal is electrically connected to the second conductor;
[0010] Wherein, the current direction of the second conductor is opposite to the current direction of the first conductor and the current direction of the third conductor respectively.
[0011] In some embodiments, the first core includes: a first conductive foil, a second conductive foil, and a plurality of first components. The input ends of the first components are electrically connected to the first conductor through the first conductive foil, and the output ends of the first components are electrically connected to the second conductor through the second conductive foil;
[0012] The second core includes: a third conductive foil, a fourth conductive foil, and a plurality of second components. The input ends of the second components are electrically connected to the second conductor through the third conductive foil, and the output ends of the second components are electrically connected to the third conductor through the fourth conductive foil.
[0013] In some embodiments, the first conductor is disposed in the first interval. The first conductor includes: a first conductive row and a first bus bar. The first conductive row is horizontally arranged, and the first bus bar is vertically arranged. The first connection terminal, the first conductive row, the first bus bar, and the first conductive foil are electrically connected in sequence.
[0014] In some embodiments, the second conductor includes: a second conductive row, a second bus bar, and a third bus bar. The second conductive row is horizontally disposed in the accommodation cavity, the second bus bar is vertically disposed in the first interval, and the third bus bar is vertically disposed in the second interval. The second conductive foil, the second bus bar, the second conductive row, the third bus bar, and the third conductive foil are electrically connected in sequence; the second connection terminal is electrically connected to the second conductive row.
[0015] In some embodiments, the third conductor is disposed in the second interval. The third conductor includes: a third conductive row and a fourth bus bar. The third conductive row is horizontally arranged, and the fourth bus bar is vertically arranged. The fourth conductive foil, the fourth bus bar, the third conductive row, and the third connection terminal are electrically connected in sequence.
[0016] In some embodiments, both the first component and the second component are self-healing components. The self-healing component includes: a core rod, a metallized film wound around the core rod, and sputtered metal layers provided at both ends of the core rod. The sputtered metal layers are electrically connected to the conductor assembly.
[0017] In some embodiments, it further includes: an insulating component and a filling resin. The insulating component includes a first insulating layer, a second insulating layer, a third insulating layer, a fourth insulating layer, a first insulating member, and a second insulating member. The first conductor is disposed between the first insulating layer and the second insulating layer, the second conductor is disposed between the second insulating layer and the third insulating layer, the third insulating layer is disposed between the second conductor and the third conductor, the fourth insulating layer is disposed at the bottoms of the first core and the second core, the first insulating member is disposed on both sides of the first core, the second insulating member is disposed on both sides of the second core, and the filling resin is disposed in the accommodating cavity.
[0018] In some embodiments, it further includes: a mounting bracket and a fastener. The mounting bracket is fixed to both sides of the housing, and the fastener is disposed on the mounting bracket.
[0019] In some embodiments, the housing includes: a housing body and a housing cover detachably mounted on the housing body. The housing cover is used to open or close the accommodating cavity, and the terminal block assembly is mounted on the housing cover.
[0020] In some embodiments, the first terminal, the second terminal, and the third terminal all adopt insulating terminals. The insulating terminal includes: an insulator, a conductive rod, and a nut. The insulator is mounted on the housing cover, the conductive rod is mounted on the insulator, one end of the conductive rod extends out of the insulator and is disposed in the accommodating cavity and is threadedly connected to the nut, and the conductive rod is electrically connected to the conductor assembly.
[0021] The present invention provides a dry-type DC support capacitor. Compared with the prior art, its beneficial effects are as follows:
[0022] The provided insulating partition divides the accommodating cavity into a first interval and a second interval. The first core is disposed in the first interval, and the second core is disposed in the second interval. The first conductor is used to electrically connect the first terminal and the input end of the first core, the second conductor is used to electrically connect the output end of the first core and the input end of the second core, the third conductor is used to electrically connect the output end of the second core and the third terminal, and the second terminal is electrically connected to the second conductor. In this way, the first core and the second core are connected in series through the second conductor, and can withstand high voltage and large current; the first conductor, the second conductor, and the third conductor are distributed from outside to inside in sequence, and the current directions of the second conductor are opposite to the current directions of the first conductor and the third conductor respectively, thereby reducing the inductance. Description of the Drawings
[0023] Figure 1Front view structural schematic diagram of the dry-type DC support capacitor provided by some embodiments of the present invention.
[0024] Figure 2 Left view structural schematic diagram of the dry-type DC support capacitor provided by some embodiments of the present invention.
[0025] Figure 3 Top view structural schematic diagram of the dry-type DC support capacitor provided by some embodiments of the present invention.
[0026] Figure 4 Principle structural schematic diagram of the dry-type DC support capacitor provided by some embodiments of the present invention.
[0027] Figure 5 For Figure 2 Front view structural schematic diagram of the cross-section along the A direction in
[0028] Figure 6 For Figure 5 Local enlarged structural schematic diagram at B in
[0029] Figure 7 For Figure 2 Rear view structural schematic diagram of the cross-section along the A direction in
[0030] Figure 8 For Figure 7 Local enlarged structural schematic diagram at C in
[0031] Figure 9 Explosion structural schematic diagram of the first terminal of the dry-type DC support capacitor provided by some embodiments of the present invention.
[0032] Figure 10 Top view structural schematic diagram after laying flat the first conductive bar, the second conductive bar and the third conductive bar of the dry-type DC support capacitor provided by some embodiments of the present invention.
[0033] Figure 11 Front view enlarged structural schematic diagram of the conductor assembly of the dry-type DC support capacitor provided by some embodiments of the present invention.
[0034] In the figure:
[0035] 1. Outer shell; 11. Accommodation cavity; 111. First interval; 112. Second interval; 12. Insulating partition; 13. Housing; 14. Shell cover;
[0036] 2. Terminal assembly; 2a. First terminal; 2b. Second terminal; 2c. Third terminal; 21. Insulator; 22. Conductive rod; 23. Nut;
[0037] 3. First core; 31. First conductive foil; 32. Second conductive foil; 33. First element;
[0038] 4. Second core; 41. Third conductive foil; 42. Fourth conductive foil; 43. Second component;
[0039] 5. Conductor assembly; 51. First conductor; 511. First conductive row; 5111. First square hole; 5112. First round hole; 512. First bus bar; 52. Second conductor; 521. Second conductive row; 5211. Second square hole; 5212. Second round hole; 5213. Third round hole; 522. Second bus bar; 523. Third bus bar; 53. Third conductor; 531. Third conductive row; 5311. Third square hole; 5312. Fourth round hole; 532. Fourth bus bar;
[0040] 6. Insulation assembly; 61. First insulation layer; 62. Second insulation layer; 63. Third insulation layer; 64. Fourth insulation layer; 65. First insulation part; 66. Second insulation part;
[0041] 7. Filling resin;
[0042] 8. Mounting bracket;
[0043] 9. Fastener. Detailed implementation manners
[0044] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.
[0045] It should be understood that in the description of the present application, the orientation or positional relationships indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. That is, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In addition, unless otherwise specified, the meaning of "plurality" is two or more.
[0046] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0047] Such as Figures 1-11As shown in the figure, the dry-type DC support capacitor provided by the embodiment of the present invention includes: a housing 1, a terminal assembly 2, a first core 3, a second core 4, and a conductor assembly 5. Among them, the first core 3 and the second core 4 are connected in series with each other through the conductor assembly 5, and are connected to the terminal assembly 2, and are connected to an external circuit through the terminal assembly 2.
[0048] The housing 1 has a receiving cavity 11 and an insulating partition 12. The insulating partition 12 divides the receiving cavity 11 into a first section 111 and a second section 112. The first core 3 is arranged in the first section 111, and the second core 4 is arranged in the second section 112. In this way, insulation between the first core 3 and the second core 4 is achieved through the insulating partition 12.
[0049] The terminal assembly 2 is installed on the housing 1. The terminal assembly 2 includes a first terminal 2a, a second terminal 2b, and a third terminal 2c.
[0050] The conductor assembly 5 is arranged in the receiving cavity 11. The conductor assembly 5 includes a first conductor 51, a second conductor 52, and a third conductor 53 distributed from the outside to the inside. The first conductor 51 is used to electrically connect the first terminal 2a and the input end of the first core 3. The second conductor 52 is used to electrically connect the output end of the first core 3 and the input end of the second core 4. The third conductor 53 is used to electrically connect the output end of the second core 4 and the third terminal 2c. The second terminal 2b is electrically connected to the second conductor 52. In this way, the first core 3 and the second core 4 are connected in series through the second conductor 52. The first core 3 is electrically connected to the first terminal 2a through the first conductor 51, and the second core 4 is electrically connected to the third terminal 2c through the third conductor 53.
[0051] In this embodiment, the current directions of the second conductor 52 are respectively opposite to the current directions of the first conductor 51 and the third conductor 53. In this way, the magnetic field generated on the second conductor 52 can cancel out the magnetic fields generated by the first conductor 51 and the third conductor 53, thereby reducing the inductance.
[0052] Based on the above structural arrangement, the first core 3 and the second core 4 are connected in series through the second conductor 52, which can enable the dry-type DC support capacitor to have a high withstand voltage and a large withstand current. The first conductor 51, the second conductor 52, and the third conductor 53 are distributed from the outside to the inside in sequence, and the current directions of the second conductor 52 are respectively opposite to the current directions of the first conductor 51 and the third conductor 53, so that the magnetic field generated on the second conductor 52 can cancel out the magnetic fields generated by the first conductor 51 and the third conductor 53, thereby reducing the inductance.
[0053] As Figures 5-8As shown, in some embodiments, the first core 3 includes: a first conductive foil 31, a second conductive foil 32, and a plurality of first components 33. The input ends of the first components 33 are electrically connected to the first conductor 51 through the first conductive foil 31, and the output ends of the first components 33 are electrically connected to the second conductor 52 through the second conductive foil 32. In this way, the first components 33 are connected in parallel, and the wiring is carried out through the first conductive foil 31 and the second conductive foil 32, which is convenient for folding and adjusting the position, and has a good heat dissipation effect.
[0054] The second core 4 includes: a third conductive foil 41, a fourth conductive foil 42, and a plurality of second components 43. The input ends of the second components 43 are electrically connected to the second conductor 52 through the third conductive foil 41, and the output ends of the second components 43 are electrically connected to the third conductor 53 through the fourth conductive foil 42. In this way, the second components 43 are connected in parallel, and the wiring is carried out through the third conductive foil 41 and the fourth conductive foil 42, which is convenient for folding and adjusting the position, and has a good heat dissipation effect.
[0055] Exemplarily, the first conductive foil 31, the second conductive foil 32, the third conductive foil 41, and the fourth conductive foil 42 are all made of copper foil.
[0056] Such as Figure 5 、 Figure 6 and Figure 11 , in some embodiments, the first conductor 51 is disposed in the first interval 111. The first conductor 51 includes: a first conductive row 511 and a first bus bar 512. The first conductive row 511 is horizontally arranged, and the first bus bar 512 is vertically arranged. The first connection terminal 2a, the first conductive row 511, the first bus bar 512, and the first conductive foil 31 are electrically connected in sequence. In this way, the current direction is: the first connection terminal 2a → the first conductive row 511 → the first bus bar 512 → the first conductive foil 31 → the first component 33. During installation, one end of the first conductive row 511 has a folded edge, and the first bus bar 512 is welded to the folded edge of the first conductive row 511 to ensure the structural stability of the connection.
[0057] Such as Figure 5 、 Figure 6 and Figure 11, in some embodiments, the second conductor 52 includes: a second conductive row 521, a second bus bar 522, and a third bus bar 523. The second conductive row 521 is horizontally disposed in the accommodation cavity 11, the second bus bar 522 is vertically disposed in the first interval 111, and the third bus bar 523 is vertically disposed in the second interval 112. The second conductive foil 32, the second bus bar 522, the second conductive row 521, the third bus bar 523, and the third conductive foil 41 are electrically connected in sequence; the second terminal 2b is electrically connected to the second conductive row 521. Thus, the current direction is: second conductive foil 32 → second bus bar 522 → second conductive row 521 → third bus bar 523 → third conductive foil 41. During installation, the two ends of the second conductive row 521 have flanges, and the second bus bar 522 and the third bus bar 523 are correspondingly welded to the flanges at the two ends of the second conductive row 521 to ensure the structural stability of the connection part.
[0058] As Figure 5 , Figure 6 and Figure 11 , in some embodiments, the third conductor 53 is disposed in the second interval 112. The third conductor 53 includes: a third conductive row 531 and a fourth bus bar 532. The third conductive row 531 is horizontally arranged, and the fourth bus bar 532 is vertically arranged. The fourth conductive foil 42, the fourth bus bar 532, the third conductive row 531, and the third terminal 2c are electrically connected in sequence. Thus, the current direction is: fourth conductive foil 42 → fourth bus bar 532 → third conductive row 531 → third terminal 2c. During installation, one end of the third conductive row 531 has a flange, and the fourth bus bar 532 is welded to the flange of the third conductive row 531 to ensure the structural stability of the connection part.
[0059] As Figure 5 , Figure 6 and Figure 11 , in the above embodiments, the first conductive row 511, the second conductive row 521, and the third conductive row 531 are distributed from outside to inside in sequence. The current direction of the second conductive row 521 is opposite to the current directions of both the first conductive row 511 and the third conductive row 531, which can reduce the inductance; the first bus bar 512 is located outside the second bus bar 522, and the current direction of the first bus bar 512 is opposite to the current direction of the second bus bar 522, which can reduce the inductance; the third bus bar 523 is located outside the fourth bus bar 532, and the current direction of the third bus bar 523 is opposite to the current direction of the fourth bus bar 532, which can reduce the inductance.
[0060] Exemplarily, the first conductive row 511, the first bus bar 512, the second conductive row 521, the second bus bar 522, the third bus bar 523, the third conductive row 531, and the fourth bus bar 532 are all made of copper bars.
[0061] In some embodiments, both the first element 33 and the second element 43 are self-healing elements. The self-healing element includes: a mandrel, a metallized film wound around the mandrel, and sputtered metal layers provided at both ends of the mandrel. The sputtered metal layers are electrically connected to the conductor assembly 5. Among them, the metallized film has the characteristic of instantly restoring the dielectric insulation performance between the electrodes after being broken down, enabling the self-healing element to have self-healing properties. Specifically, when the applied voltage increases, the metallized film is first broken down at the weak electrical point to form a discharge channel. Charge forms a large current through the discharge channel, generating a high-temperature arc, which causes the metal layer around the breakdown point to heat up and evaporate and diffuse outward. When the evaporation and diffusion area increases to a certain extent, the plasma discharge arc extinguishes, and the metallized film restores insulation. The process of the metal layer heating up and evaporating requires that the duration and energy consumption of the arc do not cause damage to the dielectric.
[0062] As Figure 5 and 6 shown, in some embodiments, the dry-type DC support capacitor further includes: an insulation assembly 6 and a filling resin 7. The insulation assembly 6 includes a first insulating layer 61, a second insulating layer 62, a third insulating layer 63, a fourth insulating layer 64, a first insulating member 65, and a second insulating member 66. The first conductor 51 is disposed between the first insulating layer 61 and the second insulating layer 62, the second conductor 52 is disposed between the second insulating layer 62 and the third insulating layer 63, and the third insulating layer 63 is disposed between the second conductor 52 and the third conductor 53. In this way, the first conductor 51, the second conductor 52, and the third conductor 53 are insulated from each other. The fourth insulating layer 64 is disposed at the bottom of the first core 3 and the second core 4, the first insulating member 65 is disposed on both sides of the first core 3, the second insulating member 66 is disposed on both sides of the second core 4, and the filling resin 7 is disposed in the accommodation cavity 11. In this way, the insulation between the first core 3, the second core 4, and the housing 1 is further improved. Specifically, the filling resin 7 is polyurethane.
[0063] As Figure 1 shown, in some embodiments, the dry-type DC support capacitor further includes: a mounting bracket 8 and a fastener 9. The mounting bracket 8 is fixed to both sides of the housing 1, and the fastener 9 is disposed on the mounting bracket 8. In this way, the housing 1 is mounted and fixed at the working position through the fastener 9 on the mounting bracket 8. Specifically, the fastener adopts a bolt and nut structure.
[0064] As Figure 1 and 5 shown, in some embodiments, the housing 1 includes: a housing body 13 and a housing cover 14 detachably mounted on the housing body 13. The housing cover 14 is used to open or close the accommodation cavity 11, and the terminal block assembly 2 is mounted on the housing cover 14. Among them, the part of the terminal block assembly 2 passing through the housing cover 14 is sealed with a sealant.
[0065] As Figure 9 and 10As shown, in some embodiments, the first terminal 2a, the second terminal 2b, and the third terminal 2c all adopt insulating terminals. The insulating terminal includes: an insulator 21, a conductive rod 22, and a nut 23. The insulator 21 is installed on the housing cover 14, the conductive rod 22 is installed on the insulator 21, one end of the conductive rod 22 extends out of the insulator 21 and is arranged in the accommodating cavity 11, and is threadedly connected to the nut 23. The conductive rod 22 is electrically connected to the conductor assembly 5.
[0066] During specific installation, the first conductive busbar 511 is provided with a first square hole 5111 and a first round hole 5112. The conductive rod 22 of the first terminal 2a is welded in the first square hole 5111 to make the conductive rod 22 of the first terminal 2a energized with the first conductive busbar 511. The conductive rod 22 of the second terminal 2b passes through the first round hole 5112, and an insulating layer is used to insulate the conductive rod 22 of the second terminal 2b from the first conductive busbar 511.
[0067] The second conductive busbar 521 is provided with a second square hole 5211, a second round hole 5212, and a third round hole 5213. The conductive rod 22 of the second terminal 2b is welded in the second square hole 5211 to make the conductive rod 22 of the second terminal 2b energized with the second conductive busbar 521. The conductive rod 22 of the first terminal 2a passes through the second round hole 5212 and is locked by the nut 23. The conductive rod 22 of the third terminal 2c passes through the third round hole 5213, and an insulating layer is used to insulate both the conductive rod 22 of the first terminal 2a and the conductive rod 22 of the third terminal 2c from the second conductive busbar 521.
[0068] The third conductive busbar 531 is provided with a third square hole 5311 and a fourth round hole 5312. The conductive rod 22 of the third terminal 2c is welded in the third square hole 5311 and locked by the nut 23 to make the conductive rod 22 of the third terminal 2c energized with the third conductive busbar 531. The conductive rod 22 of the second terminal 2b passes through the fourth round hole 5312 and is locked by the nut 23, and an insulating layer is used to insulate the conductive rod 22 of the second terminal 2b from the first conductive busbar 511.
[0069] It should be noted that when observing from a front view perspective, the first conductive busbar 511, the second conductive busbar 521, and the third conductive busbar 531 are horizontally arranged from outside to inside in sequence.
[0070] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.
Claims
1. A dry-type DC support capacitor, characterized in that, Comprising: A housing having a receiving cavity and an insulating partition, the insulating partition dividing the receiving cavity into a first section and a second section; A terminal assembly mounted on the housing, the terminal assembly including a first terminal, a second terminal and a third terminal; A first core disposed in the first section; A second core disposed in the second section; And A conductor assembly disposed in the receiving cavity, the conductor assembly including a first conductor, a second conductor and a third conductor distributed from outside to inside, the first conductor being used for electrically connecting the first terminal and the input end of the first core, the second conductor being used for electrically connecting the output end of the first core and the input end of the second core, the third conductor being used for electrically connecting the output end of the second core and the third terminal, and the second terminal being electrically connected to the second conductor; Wherein, the current direction of the second conductor is opposite to the current direction of the first conductor and the current direction of the third conductor respectively.
2. The dry-type DC support capacitor according to claim 1, wherein The first core includes: a first conductive foil, a second conductive foil and a plurality of first components, the input ends of the first components are electrically connected to the first conductor through the first conductive foil, and the output ends of the first components are electrically connected to the second conductor through the second conductive foil; The second core includes: a third conductive foil, a fourth conductive foil and a plurality of second components, the input ends of the second components are electrically connected to the second conductor through the third conductive foil, and the output ends of the second components are electrically connected to the third conductor through the fourth conductive foil.
3. The dry-type DC support capacitor according to claim 2, characterized in that, The first conductor is disposed in the first section, the first conductor includes: a first conductive row and a first bus bar, the first conductive row is horizontally arranged, the first bus bar is vertically arranged, and the first terminal, the first conductive row, the first bus bar and the first conductive foil are electrically connected in sequence.
4. The dry-type DC support capacitor according to claim 2, characterized in that, The second conductor includes: a second conductive row, a second bus bar and a third bus bar, the second conductive row is horizontally disposed in the receiving cavity, the second bus bar is vertically disposed in the first section, the third bus bar is vertically disposed in the second section, and the second conductive foil, the second bus bar, the second conductive row, the third bus bar and the third conductive foil are electrically connected in sequence; the second terminal is electrically connected to the second conductive row.
5. The dry-type DC support capacitor according to claim 2, characterized in that, The third conductor is disposed in the second section, the third conductor includes: a third conductive row and a fourth bus bar, the third conductive row is horizontally arranged, the fourth bus bar is vertically arranged, and the fourth conductive foil, the fourth bus bar, the third conductive row and the third terminal are electrically connected in sequence.
6. The dry-type DC support capacitor according to claim 2, wherein, Both the first component and the second component are self-healing components, the self-healing component includes: a core rod, a metallized film wound around the core rod and spraying metal layers disposed at both ends of the core rod, and the spraying metal layers are electrically connected to the conductor assembly.
7. The dry-type DC support capacitor according to claim 1, characterized in that, Further comprising: Insulating component and filling resin, the insulating component includes a first insulating layer, a second insulating layer, a third insulating layer, a fourth insulating layer, a first insulating member and a second insulating member. The first conductor is disposed between the first insulating layer and the second insulating layer, the second conductor is disposed between the second insulating layer and the third insulating layer, the third insulating layer is disposed between the second conductor and the third conductor, the fourth insulating layer is disposed at the bottoms of the first core and the second core, the first insulating member is disposed on both sides of the first core, the second insulating member is disposed on both sides of the second core, and the filling resin is disposed in the accommodating cavity.
8. The dry-type DC support capacitor according to claim 1, characterized in that, Further included are: A mounting bracket and a fastener, the mounting bracket is fixed to both sides of the housing, and the fastener is disposed on the mounting bracket.
9. The dry-type DC support capacitor according to claim 1, characterized in that, The housing includes: a housing body and a housing cover detachably mounted on the housing body. The housing cover is used to open or close the accommodating cavity, and the terminal block assembly is mounted on the housing cover.
10. The dry-type DC support capacitor according to claim 9, characterized in that, The first terminal, the second terminal and the third terminal all adopt insulating terminals. The insulating terminal includes: an insulator, a conductive rod and a nut. The insulator is mounted on the housing cover, the conductive rod is mounted on the insulator, one end of the conductive rod extends out of the insulator and is disposed in the accommodating cavity, and is threadedly connected to the nut. The conductive rod is electrically connected to the conductor assembly.