CN220821303U - Metallized high-voltage parallel capacitor explosion-proof device - Google Patents
Metallized high-voltage parallel capacitor explosion-proof device Download PDFInfo
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- CN220821303U CN220821303U CN202222084647.XU CN202222084647U CN220821303U CN 220821303 U CN220821303 U CN 220821303U CN 202222084647 U CN202222084647 U CN 202222084647U CN 220821303 U CN220821303 U CN 220821303U
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- out terminal
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- 239000003990 capacitor Substances 0.000 title claims abstract description 44
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 19
- 239000010949 copper Substances 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000004020 conductor Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000011810 insulating material Substances 0.000 claims abstract description 5
- 238000001465 metallisation Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 238000004880 explosion Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 11
- 239000003921 oil Substances 0.000 description 7
- 235000019198 oils Nutrition 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000003027 oil sand Substances 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
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- Fuses (AREA)
Abstract
The invention relates to an explosion-proof device of a metallized high-voltage parallel capacitor, which comprises a metallized high-voltage parallel power capacitor, a pressure protection device and a fuse arranged outside an extraction terminal I, wherein the pressure protection device is arranged on a metal shell of the metallized high-voltage parallel power capacitor, the device is of a piston structure, the center of a movable part of a piston is a copper material contact, the copper material contact is connected with the extraction terminal I of a product through the extraction terminal III, a piston cylinder body is made of an insulating material, and a copper conductor contact at the top of the cylinder body is connected with the extraction terminal IV of the product through the extraction terminal II inside the insulating cylinder body.
Description
Technical Field
The invention relates to the field of high-voltage parallel capacitors, in particular to a safety explosion-proof device for a metallized high-voltage parallel capacitor.
Background
The metallized core is characterized in that the capacitor electrode plate is formed by a metal vacuum evaporation process, and the thickness of the metal is only a few percent of micrometers, so that the metallized capacitor core has a self-healing function, namely, the metallized electrode plate can be evaporated due to the fact that the electrode plate is thin due to short-circuit energy, and the metallized electrode plate also has the problem that the metallized electrode plate cannot be protected by fuses due to infinite current caused by short-circuit like a metal electrode.
The short-circuit current and rated current of the metallized capacitor core are basically one order of magnitude, namely, the short-circuit current is 1-2 times of the rated current, so that the metallized capacitor cannot be protected by a fuse, the safety explosion-proof device of the low-voltage metallized capacitor is in a pressure explosion-proof device mode, namely, the product is additionally provided with a pressure breaking device in a metal shell to protect the safety of the product when the product is damaged, but the breaking protection of the high-voltage parallel capacitor product above 1000v can generate an arc-pulling phenomenon when the voltage is high, so that the high-voltage field cannot be directly protected by breaking.
The current products of the alternating current parallel capacitors with the voltages of 1000v and above are mainly of foil type oil immersed structures, and the current approaches infinity when the polar plates are in foil type short circuit, so that the current can be protected by fuses, and particularly, the two modes of an internal fuse and an external fuse are adopted.
The metallized high-voltage parallel capacitor has not been developed before because partial discharge is not solved, and along with the technical development, if the partial discharge is solved, the metallized high-voltage parallel capacitor has a great market prospect.
However, the metallized capacitor is characterized in that the polar plate is thin and has a self-healing function because the polar plate is formed by vacuum evaporation through a thin film process, and the safety of the product cannot be ensured by fuse protection because the short circuit current is not large and the rated current is close when the metallized capacitor breaks down and is short. There is a need for a safe explosion-proof device that is suitable for metallized capacitive features. The low voltage metallized capacitor can be broken by pressure to protect the product safety. But in the high-voltage field, the breaking protection has the arcing phenomenon and is unsafe.
Disclosure of Invention
According to the invention, when the metallized high-voltage parallel capacitor product is damaged, the pressure in the shell is increased, so that the piston of the explosion-proof device moves to cause the two poles of the product to be artificially short-circuited, and the short-circuited product can provide more than 10 times of rated current, and the short-circuited current enables the external fuse placed in the terminal to be disconnected and the power-off protection fuse core to be disconnected, so that the explosion-proof device can protect the product.
The invention aims to provide a safety explosion-proof device for a metallized high-voltage parallel power capacitor, which utilizes the phenomenon that when a metallized capacitor core breaks down and is short-circuited, only the internal pressure of a capacitor shell is increased to push a pressure device to move, so that a manually arranged mechanism realizes metal short-circuit to provide enough short-circuit current, and the phenomenon that the current is not enough and cannot be protected by a fuse wire when the metallized capacitor core is short-circuited is solved.
The technical proposal of the invention is as follows
A metallized high-voltage parallel capacitor explosion-proof device comprises a metallized high-voltage parallel power capacitor, a pressure protection device and a fuse arranged outside an extraction terminal I (6), wherein the pressure protection device (10) is arranged on a metal shell (5) of the metallized high-voltage parallel power capacitor, the device is of a piston type structure, a copper material contact (14) is arranged at the center of a movable part of a piston, the copper material contact (14) is connected with the extraction terminal I (6) of a product through an extraction terminal III (15), a piston cylinder body is made of an insulating material, and a copper conductor contact (12) at the top of the cylinder body is connected to the extraction terminal IV (7) of the product through an extraction terminal II (13) inside the insulating cylinder body.
The pressure protection device (10) is provided with a turnbuckle, the leading-out terminal I (6) of a connection product is a conductor contact 12, the conductor contact (12) and the leading-out terminal II (13) are metal inserts, the metal inserts are injected into a piston shell, the copper material contact (14) and the leading-out terminal III (15) of the connection leading-out terminal (6) are fixed on a movable insulating piston body in a screw fastening mode, the middle insulating partition plate (17) is of a circular structure, and the connection device is assembled in a clamping groove of an inner cavity of the piston.
As shown in figure 1, a pressure short-circuit protection device as shown in figure 4 is added on a metallized high-voltage parallel power capacitor shell, the device is of a piston type structure, the center of a movable part of a piston is a copper material contact 14 which is connected with a lead-out terminal I6 of a product through a lead-out terminal III15, a piston cylinder body is made of insulating materials and has good insulativity, and a conductor contact 12 at the top of the cylinder body is connected to a lead-out terminal IV (7) of the product through a lead-out terminal II13 inside the insulating cylinder body. Normally the conductor contact 12 and the copper contact 14 meet the performance requirements of the product because of the dielectric strength of the piston inner chamber diaphragm.
However, when the product core breaks down, the internal pressure of the product can be greatly increased, the piston can move to cause the two-point contact of the conductor contact 12 and the copper material contact 14, which is equivalent to the direct short circuit between the lead-out terminal I6 and the lead-out terminal IV (7) of the product, so that the short circuit current can be very large and is tens times or even tens times of the rated current of the product, and the fuse 11 arranged in the terminal can be easily disconnected by the short circuit current, thereby realizing the power-off protection of the product.
The invention has the advantages that: the internal pressure can be greatly increased by using the breakdown of the metallized high-parallel power capacitor core to push the pressure protection device to displace to artificially realize the short circuit of the product, and the hard short circuit current approaches infinity and can easily blow the fuse 11 outside the terminal, thereby realizing the power-off protection of the product.
Drawings
Fig. 1 is a schematic diagram of the product of the present invention.
Fig. 2 is a general assembly view of a metallized high voltage shunt capacitor with a pressure short circuit protection device of the present invention.
Fig. 3 is a drawing of a terminal with an external fuse of the product.
Fig. 4 is a schematic structural view of the pressure protection apparatus 10.
In the figure, 1 is a core (24), 2 is a connecting wire, 3 is a positioning sleeve, 4 is oil sand filled between a core group and a shell, 5 is a metal shell, 6 is a lead-out terminal I, 7 is a lead-out terminal IV of a product, 8 is an oil filling hole, 9 is an overvoltage protection valve device, 10 is a pressure protection device, 11 is a fuse wire, 12 is a conductor contact, 13 is a lead-out terminal II of a connecting contact 12, 14 is a copper material contact, 15 is a lead-out terminal III of the connecting contact 14, 16 is a lead-out terminal nut, and 17 is an insulating partition plate.
Detailed Description
The utility model provides a metallization high voltage shunt capacitor explosion-proof equipment, it includes metallization high voltage shunt power capacitor and pressure protection device and external fuse in extraction terminal I6, its characterized in that: a pressure protection device 10 is arranged on a metal shell 5 of a metallized high-voltage parallel power capacitor, the device is of a piston type structure, the center of a movable part of a piston is a copper material contact 14, a leading-out terminal III is a leading-out terminal of a connecting contact 14, a leading-out terminal II13 is a leading-out terminal of a connecting contact 12, a leading-out terminal III15 is connected with a leading-out terminal I6, a piston cylinder body is made of an insulating material, and a copper conductor contact 12 at the top of the cylinder body is connected to a leading-out terminal IV7 of a product through the leading-out terminal II13 of the connecting contact 12. The pressure protection device 10 is provided with a turnbuckle, the conductor contact 12 and the leading-out terminal II13 are metal inserts, the metal inserts are injected into the piston shell, the copper material contact 14 and the leading-out terminal III15 connected with the leading-out terminal I6 are fixed on the movable insulating piston body in a screw fastening mode, and the disc structure of the middle insulating partition 17 is assembled in the clamping groove of the inner cavity of the piston.
The first step is to weld the metallized capacitor cores in series and parallel to form a core group by braided copper wires according to a schematic diagram.
And secondly, assembling a cover plate according to a schematic diagram, wherein one terminal of the cover plate is made as shown in fig. 3 on the basis of a lead-out terminal of a conventional product, namely, a fuse is additionally arranged in a terminal cavity of the conventional high-voltage parallel capacitor to protect the product. The core group and the terminals are connected to a pressure short circuit explosion-proof device according to a schematic diagram to form a parallel connection state of the high-voltage parallel capacitor core group and the pressure short circuit protection device, then the cover plate and the metal shell of the capacitor are welded into a whole by argon arc welding or laser welding according to the normal process of the high-voltage parallel capacitor, and then insulating oil suitable for the metallized capacitor core, such as silicone oil, vegetable oil, epoxy soybean oil and the like, is vacuum-filled according to the process of a conventional product, and after the test of the encapsulation oil filling hole is qualified, the box is marked. In order to meet the development requirements of dry type and oil reduction, the core is filled with 40-150 mesh quartz sand after being assembled with the shell. Thus, the inside of the metal shell of the metallized high-voltage parallel capacitor is filled with oil sand, the core group still works in the oil environment, but the oil consumption in the whole product is greatly reduced.
Claims (2)
1. The utility model provides a metallization high voltage shunt capacitor explosion-proof equipment, it includes metallization high voltage shunt power capacitor and pressure protection device and external fuse in terminal I (6), its characterized in that: a pressure protection device (10) is arranged on a metal shell (5) of a metallized high-voltage parallel power capacitor, the device is of a piston type structure, the center of a movable part of a piston is provided with a copper material contact (14), the copper material contact (14) is connected with a product lead-out terminal I (6) through a lead-out terminal III (15), a piston cylinder body is made of an insulating material, and a copper conductor contact (12) at the top of the cylinder body is connected with a product lead-out terminal IV (7) through an insulating cylinder body inner lead-out terminal II (13).
2. A metallized high voltage shunt capacitor explosion proof device according to claim 1, wherein: the pressure protection device (10) is provided with a turnbuckle, the conductor contact (12) is connected with a contact of a leading-out terminal of a product, the conductor contact (12) and the leading-out terminal II (13) are metal inserts and are injection molded into a piston shell, a copper material contact (14) and a leading-out terminal III (15) of a leading-out terminal I (6) of the product are fixed on a movable insulating piston body in a screw fastening mode, and an intermediate insulating partition plate (17) is of a circular structure and is assembled into a clamping groove of an inner cavity of the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222084647.XU CN220821303U (en) | 2022-08-09 | 2022-08-09 | Metallized high-voltage parallel capacitor explosion-proof device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222084647.XU CN220821303U (en) | 2022-08-09 | 2022-08-09 | Metallized high-voltage parallel capacitor explosion-proof device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220821303U true CN220821303U (en) | 2024-04-19 |
Family
ID=90712330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222084647.XU Active CN220821303U (en) | 2022-08-09 | 2022-08-09 | Metallized high-voltage parallel capacitor explosion-proof device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220821303U (en) |
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2022
- 2022-08-09 CN CN202222084647.XU patent/CN220821303U/en active Active
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