CN110648878A - High-voltage-class vacuum arc-extinguishing chamber with outer shielding case - Google Patents
High-voltage-class vacuum arc-extinguishing chamber with outer shielding case Download PDFInfo
- Publication number
- CN110648878A CN110648878A CN201911059316.7A CN201911059316A CN110648878A CN 110648878 A CN110648878 A CN 110648878A CN 201911059316 A CN201911059316 A CN 201911059316A CN 110648878 A CN110648878 A CN 110648878A
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- Prior art keywords
- outer shielding
- vacuum arc
- end outer
- static
- movable end
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
- H01H2033/66292—Details relating to the use of multiple screens in vacuum switches
Landscapes
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
A high-voltage grade vacuum arc extinguish chamber with an outer shield cover belongs to the field of high-voltage vacuum switches and comprises a vacuum arc extinguish chamber body, a movable end outer shield cover and a static end outer shield cover; outer shielding covers are respectively added at the welding positions of the movable end plate and the static end plate at two ends of the vacuum arc extinguish chamber and the ceramic shell so as to balance the electric field distribution at the three-phase interface of the cover plate, the ceramic shell and the air and improve the insulating property of the vacuum arc extinguish chamber; the invention can obviously improve the insulating property of the vacuum arc-extinguishing chamber, promote the vacuum arc-extinguishing chamber to develop to a high voltage grade and meet the insulating requirement of a power transmission grade switch.
Description
Technical Field
The invention belongs to the field of medium and high voltage vacuum switches, and particularly relates to a high voltage grade vacuum arc-extinguishing chamber with an outer shielding case.
Background
Vacuum interrupter is the core component of a vacuum circuit breaker, which in the medium voltage distribution sector occupies more than 95% of the switchgear, but at transmission levels above 126kV, is still SF today6Gas switches dominate. However, SF6Is one of 6 greenhouse effect gases pointed out by the Jingdu protocol and the global warmingCoefficient of CO223800 times higher, and its lifetime in the atmosphere is 3200 years, which is extremely difficult to degrade. Therefore, to control the greenhouse effect, SF is limited or even eliminated6The use of gases is a necessary trend. The vacuum arc-extinguishing chamber has the characteristics of high insulating property, environmental friendliness and the like, and is considered to replace SF6Gas switches are one of the important options for applications in the field of high voltage power transmission.
Currently, the application range of the vacuum interrupter is continuously developing towards high voltage grade and miniaturization, which requires the vacuum interrupter to have higher insulation parameters and better insulation performance. The inner shield is usually arranged at the welding position of the movable end plate and the static end plate in the vacuum arc extinguish chamber and the ceramic shell so as to balance the electric field aggregation at the intersection of vacuum, ceramic and metal, and the insulation performance in the vacuum arc extinguish chamber is usually good. However, air or other insulating media are usually outside the vacuum arc-extinguishing chamber, and an electric field at the intersection of the air (or other insulating media), the metal and the ceramic is not well distributed, so that electric field concentration occurs at the welding position of the ceramic shell and the end plate, and in severe cases, the insulation of the vacuum arc-extinguishing chamber is damaged, and the switch fails. With the development of the vacuum arc-extinguishing chamber towards high-voltage grade application and miniaturization, the vacuum arc-extinguishing chamber is required to have not only good internal insulation performance, but also better external insulation performance.
Disclosure of Invention
In order to improve the insulating capability of the vacuum arc-extinguishing chamber, the invention provides the high-voltage-grade vacuum arc-extinguishing chamber with the outer shielding cover, the outer shielding cover is additionally arranged at the joint of the outer side of the vacuum arc-extinguishing chamber, the two end plates and the ceramic shell, the electric field distribution at the external triple-phase interface of the vacuum arc-extinguishing chamber can be effectively balanced, and the insulating capability of the vacuum arc-extinguishing chamber is obviously improved.
In order to achieve the above purposes, the invention adopts the technical scheme that:
a high-voltage class vacuum arc extinguish chamber with an outer shielding case comprises a vacuum arc extinguish chamber body, a movable end outer shielding case 2 and a static end outer shielding case 4; the movable end outer shielding cover 2 is welded at the joint of the movable end cover plate 1 and the ceramic shell 3 outside the vacuum arc extinguish chamber body, and the static end outer shielding cover 4 is welded at the joint of the static end cover plate 5 and the ceramic shell 3 outside the vacuum arc extinguish chamber body; the movable end outer shielding case 2 can balance the electric field at the interface of the movable end cover plate 1 of the vacuum arc-extinguishing chamber, the ceramic shell 3 and the air; meanwhile, the static end outer shielding case 4 can balance the electric field distribution at the intersection of the static end cover plate 5 of the vacuum arc-extinguishing chamber, the ceramic shell 3 and the air; the insulating property of the vacuum arc-extinguishing chamber can be obviously improved.
The movable end outer shield cover 2 and the static end outer shield cover 4 are made of metal materials and are processed into an L shape, and the bent part of the L shape and the end parts of two straight edges are rounded.
One end of the movable end outer shielding cover 2 and one end of the static end outer shielding cover 4 are respectively fixed on a movable end cover plate 1 and a static end cover plate 5 of the vacuum arc-extinguishing chamber through welding or are fixed on the end plane of the ceramic shell 3 through welding, the other end of the movable end outer shielding cover 2 and the static end outer shielding cover 4 are 1-20mm away from the outer surface of the ceramic shell 3, and the height H of the movable end outer shielding cover 2 and the static end outer shielding cover 4 can ensure that the lower edges of the movable end outer shielding cover 2 and the static end outer shielding cover 4 shield the end plane of the ceramic shell 3 by 3-20 mm; the small inner diameters A of the movable end outer shielding cover 2 and the static end outer shielding cover 4 are respectively larger than or equal to the diameters of the movable end cover plate 1 and the static end cover plate 5 of the vacuum arc-extinguishing chamber, and the large inner diameters B are larger than the outer diameter of the ceramic shell 3 of the vacuum arc-extinguishing chamber and are spaced by 1-20 mm.
Compared with the prior art, the invention has the following advantages:
the movable end outer shielding cover and the static end outer shielding cover are additionally arranged outside the vacuum arc extinguish chamber, so that the electric field distribution at the external triple-phase boundary of the vacuum arc extinguish chamber is balanced, the insulating capability of the vacuum arc extinguish chamber is improved, the reliability of the vacuum arc extinguish chamber is improved, and the vacuum arc extinguish chamber can be promoted to be popularized and applied to a high-voltage power transmission grade switch.
Drawings
Fig. 1 is a front view of a high voltage class vacuum interrupter with an outer shield according to the present invention.
Fig. 2 is a partially enlarged view of the external shield of the present invention secured to the end plate of the vacuum interrupter.
Fig. 3 is a front sectional view of the outer shield of the present invention.
Detailed Description
As shown in fig. 1 and fig. 2, the high-voltage class vacuum interrupter with the external shield according to the present invention includes a vacuum interrupter body, a moving end external shield 2 and a static end external shield 4; the movable end outer shielding cover 2 is welded at the joint of the movable end cover plate 1 and the ceramic shell 3 outside the vacuum arc extinguish chamber body, and the static end outer shielding cover 4 is welded at the joint of the static end cover plate 5 and the ceramic shell 3 outside the vacuum arc extinguish chamber body; the movable end outer shielding case 2 can balance the electric field at the interface of the movable end cover plate 1 of the vacuum arc-extinguishing chamber, the ceramic shell 3 and the air; meanwhile, the static end outer shielding case 4 can balance the electric field distribution at the intersection of the static end cover plate 5 of the vacuum arc-extinguishing chamber, the ceramic shell 3 and the air; the insulating property of the vacuum arc-extinguishing chamber can be obviously improved.
In a preferred embodiment of the present invention, the movable end outer shield 2 and the stationary end outer shield 4 are formed by machining an "L" shape using a metal material, and rounding a bent portion of the "L" shape and end portions of two straight edges.
As a preferred embodiment of the invention, one end of the movable end outer shielding case 2 and one end of the static end outer shielding case 4 are respectively fixed on the movable end cover plate 1 and the static end cover plate 5 of the vacuum arc-extinguishing chamber through welding or are fixed on the end plane of the ceramic shell 3 through welding, the other end is 1-20mm away from the outer surface of the ceramic shell 3, the height H of the movable end outer shield 2 and the static end outer shield 4 can ensure that the lower edges of the movable end outer shield 2 and the static end outer shield 4 shield the end plane of the ceramic shell 3 by 3-20mm, as shown in figure 3, the small inner diameter A of the movable end outer shielding case 2 and the static end outer shielding case 4 is respectively larger than or equal to the diameter of the movable end cover plate 1 and the static end cover plate 5 of the vacuum arc-extinguishing chamber, and the large inner diameter B is larger than the outer diameter of the ceramic shell 3 of the vacuum arc-extinguishing chamber and is spaced by 1-20 mm.
The external shielding cover is used for shielding three-phase junction areas at two external ends of the vacuum arc extinguish chamber, and the insulating capability of the vacuum arc extinguish chamber is improved.
Claims (3)
1. The utility model provides a high voltage level vacuum interrupter with outer shield cover which characterized in that: comprises a vacuum arc extinguish chamber body (6), a movable end outer shielding case (2) and a static end outer shielding case (4); the movable end outer shielding cover (2) is welded at the joint of the movable end cover plate (1) and the ceramic shell (3) outside the vacuum arc extinguish chamber body (6), and the static end outer shielding cover (4) is welded at the joint of the static end cover plate (5) and the ceramic shell (3) outside the vacuum arc extinguish chamber body (6); the movable end outer shielding case (2) can balance the electric field at the interface of the movable end cover plate (1) of the vacuum arc-extinguishing chamber, the ceramic shell (3) and the air; meanwhile, the static end outer shielding cover (4) can balance the electric field distribution at the interface of the static end cover plate (5) of the vacuum arc-extinguishing chamber, the ceramic shell (3) and the air; the insulating property of the vacuum arc-extinguishing chamber can be obviously improved.
2. The high voltage class vacuum interrupter with the external shield according to claim 1, wherein: the movable end outer shielding cover (2) and the static end outer shielding cover (4) are processed into an L shape by using metal materials, and the bent part of the L shape and the end parts of two straight edges are rounded.
3. The high voltage class vacuum interrupter with the external shield according to claim 1, wherein: one end of the movable end outer shielding cover (2) and one end of the static end outer shielding cover (4) are respectively fixed on a movable end cover plate (1) and a static end cover plate (5) of the vacuum arc-extinguishing chamber through welding or fixed on the end plane of the ceramic shell (3) through welding, the other end of the movable end outer shielding cover (2) and the static end outer shielding cover (4) are 1-20mm away from the outer surface of the ceramic shell (3), and the height H of the movable end outer shielding cover (2) and the static end outer shielding cover (4) can ensure that the lower edges of the movable end outer shielding cover (2) and the static end outer shielding cover (4) can shield the end plane of the ceramic shell (3) by 3; the small inner diameter A of the movable end outer shielding cover (2) and the static end outer shielding cover (4) is respectively larger than or equal to the diameters of the movable end cover plate (1) and the static end cover plate (5) of the vacuum arc-extinguishing chamber, and the large inner diameter B is larger than the outer diameter of the ceramic shell (3) of the vacuum arc-extinguishing chamber, and an interval of 1-20mm is reserved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911059316.7A CN110648878A (en) | 2019-11-01 | 2019-11-01 | High-voltage-class vacuum arc-extinguishing chamber with outer shielding case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911059316.7A CN110648878A (en) | 2019-11-01 | 2019-11-01 | High-voltage-class vacuum arc-extinguishing chamber with outer shielding case |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110648878A true CN110648878A (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911059316.7A Pending CN110648878A (en) | 2019-11-01 | 2019-11-01 | High-voltage-class vacuum arc-extinguishing chamber with outer shielding case |
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| CN (1) | CN110648878A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112435889A (en) * | 2020-12-01 | 2021-03-02 | 郑州大学 | High-voltage integrated static and dynamic self-voltage-sharing vacuum arc extinguish chamber |
| CN112509854A (en) * | 2020-12-11 | 2021-03-16 | 郑州大学 | Integrated resistance-capacitance voltage-sharing vacuum arc extinguish chamber |
| CN112786346A (en) * | 2021-01-07 | 2021-05-11 | 郑州大学 | Double-fracture self-voltage-sharing vacuum arc extinguish chamber |
-
2019
- 2019-11-01 CN CN201911059316.7A patent/CN110648878A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112435889A (en) * | 2020-12-01 | 2021-03-02 | 郑州大学 | High-voltage integrated static and dynamic self-voltage-sharing vacuum arc extinguish chamber |
| CN112509854A (en) * | 2020-12-11 | 2021-03-16 | 郑州大学 | Integrated resistance-capacitance voltage-sharing vacuum arc extinguish chamber |
| CN112786346A (en) * | 2021-01-07 | 2021-05-11 | 郑州大学 | Double-fracture self-voltage-sharing vacuum arc extinguish chamber |
| CN112786346B (en) * | 2021-01-07 | 2024-05-28 | 郑州大学 | Double-fracture self-equalizing vacuum arc-extinguishing chamber |
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