CN112509853A - Airflow control element with shielding function - Google Patents
Airflow control element with shielding function Download PDFInfo
- Publication number
- CN112509853A CN112509853A CN202011389097.1A CN202011389097A CN112509853A CN 112509853 A CN112509853 A CN 112509853A CN 202011389097 A CN202011389097 A CN 202011389097A CN 112509853 A CN112509853 A CN 112509853A
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- China
- Prior art keywords
- shielding
- shielding function
- diameter
- airflow control
- annular structure
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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
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/22—Selection of fluids for arc-extinguishing
-
- 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
- H01H33/02—Details
Abstract
The invention discloses an airflow control element with a shielding function, which is structurally composed of a substrate sintered by polytetrafluoroethylene materials and a shielding element embedded in the substrate, wherein the substrate is of an annular structure and is provided with a streamline outer surface, and the top of the substrate is a throat region; the other structure is formed by overlapping a shielding base body made of aluminum materials or copper materials or steel materials with an arc combustion resistant coating sprayed on the outer surface, and the top of the shielding base body is a throat area. The high-voltage breaker has the shielding function while controlling the airflow, realizes the guidance and control of SF6 high-pressure airflow in the process of breaking large current by the breaker, controls the maximum field intensity under the transient recovery voltage, and solves the requirements of the high-voltage breaker on the large-current breaking performance and the electric field intensity control under the transient recovery voltage; the electric field distribution of the movable contact and the fixed contact under the transient recovery voltage is effectively improved, and the difficulty of breaking large current of the circuit breaker is reduced.
Description
Technical Field
The invention relates to an airflow control element with a shielding function, and belongs to the technical field of high-voltage power equipment.
Background
High voltage circuit breakers are important devices for ensuring safe operation of electrical power systems and function to break normal load currents and short circuit fault currents in the circuit. When the short-circuit breaking current is as high as 50kA, 63kA, 80kA, 100kA or 120kA, the breaking task is very difficult for the circuit breaker.
The circuit breaker opening process is shown in figure 1. Fig. 1a), the arc extinguishing chamber of the circuit breaker is in the switching-on position, and normal load current or short-circuit fault current flows on the electric connection formed by the movable main contact 4 and the static main contact 1 and the electric connection formed by the movable arc contact 3 and the static arc contact 2. Fig. 1b), the circuit breaker arc extinguish chamber is driven by an operating mechanism (not shown in the patent) to perform opening and closing movement, SF6 gas in a pressure gas chamber 5 is compressed through a piston 6, a movable main contact 4 and a static main contact 1 are just separated, the electric connection formed by the movable main contact 4 and the static main contact 1 is disconnected, and current flows only on the electric connection formed by the movable arc contact 3 and the static arc contact 2. Fig. 1c), the moving arc contact 3 and the stationary arc contact 2 are separated, an arc is generated between the separated moving arc contact 3 and the stationary arc contact 2, and the arc heats SF6 gas in the plenum 5 while being blown by high pressure SF6 gas in the plenum 5; in order to form effective arc blowing, an air flow control element is arranged between the moving arc contact 3 and the static arc contact 2. The arc current crosses zero, the arc current is extinguished under the strong blowing of high-pressure SF6 gas realized by an airflow control element, the arc gap recovers the dielectric strength of the arc gap, and the transient recovery voltage is applied between the moving contact and the static contact; if the dielectric insulation strength between the arc gaps is higher than the electric field strength of the circuit breaker under the transient recovery voltage, the circuit breaker is successfully switched on and switched off, otherwise, the circuit breaker fails to be switched on and switched off. Fig. 1d), the circuit breaker is in the open position.
In the process of opening and closing the circuit breaker, the electric field distribution of the moving contact and the static contact under the transient recovery voltage has great influence on the success or failure of the opening and closing of the circuit breaker. The electric field strength of the movable and static contacts under the transient recovery voltage depends on the transient recovery voltage on one hand and the insulation structure of the movable and static contacts on the other hand, particularly the shape of the movable and static arcing contacts. The static arc contact is generally designed into a ball head cylindrical shape, and the moving arc contact is generally designed into a self-operated petal-shaped structure. The existing self-force contact consists of multi-petal contact fingers, a gap of about 1mm is formed between adjacent petal contact fingers, and an open petal structure of about 1mm deteriorates an insulation structure of the contact, so that the short-circuit current is difficult to open and close. Current airflow control elements do not have a shielding function.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: current airflow control elements do not have a shielding function.
In order to solve the above problems, the present invention provides an airflow control element with a shielding function, which is disposed between a moving arc contact and a stationary arc contact of a circuit breaker, and is characterized by comprising:
the base body is of an annular structure, the diameter of the excircle of the top end of the base body is smaller than that of the excircle of the bottom end of the base body, the base body is provided with a streamline outer surface, the diameter of the inner circle of the top end of the annular structure is smaller than that of the inner circle of the bottom end of the annular structure, the inside of the annular structure is step-shaped, the top of the annular structure is a throat area, the diameter of the inner circle of the throat area is smaller than that;
a shielding element embedded around the inside of the substrate.
Preferably, the streamline outer surface is designed in a diagonal streamline mode, and the included angle between the streamline outer surface and the vertical line is 4-5 degrees.
Preferably, the end part of the streamline outer surface adopts circular arc smooth transition.
Preferably, the diameter of the throat area is 30-35 mm.
Preferably, the cross-sectional diameter of the shielding element is between 6 and 10 mm.
Preferably, the shielding element is a solid rod or a hollow tube.
Preferably, the shielding element is made of aluminum material or copper material or steel material.
The invention provides another airflow control element with a shielding function, which is arranged between a movable arc contact and a static arc contact of a circuit breaker, and is characterized in that: including the coating of shielding base member and resistant electric arc burning, the shielding base member is the loop configuration that top excircle diameter is less than bottom excircle diameter, forms by aluminum product or copper product or steel preparation, and the coating is established on shielding base member surface, resistant electric arc burning's coating is the polytetrafluoroethylene coating, the interior circle diameter on loop configuration top is less than the interior circle diameter of bottom, and the loop configuration is inside to be the step form, and the loop configuration's top is the throat region that the circle diameter is little than other positions interior circle diameters for interior circle diameter.
Preferably, the thickness of the coating resistant to arc combustion is between 5 and 8 mm.
Preferably, the outer surface of the shielding base body is in arc smooth transition at the turning position.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to an airflow control element with a shielding function, which structurally comprises a substrate and a shielding element, wherein the substrate is made of polytetrafluoroethylene materials, the shielding element is embedded in the substrate, the substrate is provided with a streamline outer surface, and one end of the substrate is a throat area with a smaller inner diameter than the other end of the substrate; the other structure is formed by overlapping a shielding base body made of aluminum material or copper material or steel material with an arc combustion resistant coating sprayed on the outer surface. The high-voltage circuit breaker is arranged between the movable arc contact and the fixed arc contact of the circuit breaker, has a shielding function while controlling airflow, realizes the guiding and controlling of SF6 high-pressure airflow in the process of breaking large current by the circuit breaker, controls the maximum field intensity under the transient recovery voltage, and solves the electric field intensity control requirements of the high-voltage circuit breaker on the large-current breaking performance and the transient recovery voltage; the electric field distribution of the movable contact and the fixed contact under the transient recovery voltage is effectively improved, and the difficulty of breaking large current of the circuit breaker is reduced.
Drawings
Fig. 1 is a schematic diagram of a circuit breaker opening process;
FIG. 2 is a schematic structural diagram of an airflow control device with shielding function according to the present invention;
FIG. 3 is a schematic structural diagram of another airflow control device with shielding function according to the present invention;
description of reference numerals: 1-a stationary main contact; 2-a stationary arc contact; 3-moving arc contact; 4-moving the main contact; 5-air compression chamber; 6-a piston; 7-a nozzle;
10-a streamlined outer surface; 20-throat region; 30-a shielding element; 40-a substrate; 50-a shielding matrix; 60-arc combustion resistant coating.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
As shown in FIG. 2, the airflow control element 100 with shielding function provided by the invention comprises a substrate 40 made of a sintered polytetrafluoroethylene material and a shielding element 30 embedded in the substrate 40, wherein the substrate 40 is of an annular structure, the top end outer circle diameter of the annular structure is smaller than the bottom end outer circle diameter, the substrate 40 is provided with a streamline outer surface 10, the streamline outer surface 10 adopts a diagonal design with an included angle of 4-5 degrees with a vertical line, and the end part of the streamline outer surface 10 adopts circular arc smooth transition with a radius of R2-R5.
The diameter of the inner circle at the top end of the annular structure is smaller than that of the inner circle at the bottom end of the annular structure, the inside of the annular structure is step-shaped, and the step-shaped turning part adopts circular arc smooth transition with the radius of R2-R5. The top of the annular structure is a throat area 20 with the inner circle diameter smaller than that of the inner circles of other parts, and the diameter of the throat area 20 ranges from 30 mm to 35 mm. The shielding element 30 is made of aluminum material, copper material or steel material, and can be made into a solid bar or a hollow tube. The diameter of the shielding element 30 is between 6 and 10mm and is embedded in the throat region 20 of the base body 40 in a circle.
Fig. 3 shows another airflow control element 200 with shielding function according to the present invention, which is composed of a shielding substrate 50 and an arc-burning resistant coating 60 coated on the outer surface of the shielding substrate. The shielding base body 50 is of an annular structure, the diameter of the top end outer circle of the annular structure is smaller than that of the bottom end outer circle, the shielding base body 50 is made of aluminum materials or copper materials or steel materials, the diameter of the inner circle of the top end of the annular structure is smaller than that of the inner circle of the bottom end, the inside of the annular structure is of a step shape, and the round arc smooth transition with the radius of R2-R5 is adopted at the turning position of the step shape. The top of the annular structure is a throat area 20 with the inner circle diameter smaller than that of the inner circles of other parts, and the diameter of the throat area 20 ranges from 30 mm to 35 mm.
The inner and outer surfaces of the shielding substrate 50 are sprayed with an arc combustion resistant coating 60, and the arc combustion resistant coating 60 is a polytetrafluoroethylene coating. The outer surface of the coating 60 resistant to electric arc combustion is in a streamline design, an oblique line streamline design with an included angle of 4-5 degrees with a vertical line is adopted, and the thickness of the coating 60 resistant to electric arc combustion is 5-8 mm. The end parts and the turning parts of the coating 60 which is resistant to the arc combustion are in smooth transition by adopting circular arcs from R2 to R5.
The airflow control element is arranged between the movable arc contact 3 and the static arc contact 2 of the circuit breaker, is used for controlling the flowing direction of SF6 gas in the opening and closing process of the circuit breaker and improving the electric field distribution between the movable arc contact and the static arc contact in the opening and closing process of the circuit breaker, and can be applied to an SF6 circuit breaker with higher voltage grade and higher rated short circuit opening and closing current.
Claims (10)
1. The utility model provides a take shielding function's air current control component establishes between moving arc contact (3) and quiet arc contact (2) of circuit breaker, its characterized in that includes:
the base body (40) is of an annular structure, the diameter of the excircle of the top end of the annular structure is smaller than that of the excircle of the bottom end of the annular structure, the base body (40) is provided with a streamline outer surface (10), the diameter of the inner circle of the top end of the annular structure is smaller than that of the inner circle of the bottom end of the annular structure, the inside of the annular structure is step-shaped, the top of the annular structure is a throat region (20) with the inner circle diameter smaller than that of the inner circles of other parts, and the base;
a shielding element (30), said shielding element (30) being embedded around the inside of the matrix (40).
2. An airflow control member with a shielding function according to claim 1, characterized in that: the streamline outer surface (10) is in a diagonal streamline design with an included angle of 4-5 degrees with a vertical line.
3. An airflow control member with a shielding function according to claim 1, characterized in that: the end part of the streamline outer surface (10) adopts circular arc smooth transition.
4. An airflow control member with a shielding function according to claim 1, characterized in that: the diameter of the throat area (20) is 30-35 mm.
5. An airflow control member with a shielding function according to claim 1, characterized in that: the cross section diameter of the shielding element (30) is 6-10 mm.
6. An airflow control member with a shielding function according to claim 1, characterized in that: the shielding element (30) is a solid rod or a hollow tube.
7. An airflow control member with a shielding function according to claim 1, characterized in that: the shielding element (30) is made of aluminum material or copper material or steel material.
8. The utility model provides a take shielding function's air current control component establishes between moving arc contact (3) and quiet arc contact (2) of circuit breaker, its characterized in that: including shielding base member (50) and coating (60) of resistant electric arc burning, shielding base member (50) are less than the loop configuration of bottom excircle diameter for top excircle diameter, form by aluminum product or copper product or steel preparation, and coating (60) are established on shielding base member (50) surface, resistant electric arc burning coating (60) are the polytetrafluoroethylene coating, the interior circle diameter on loop configuration top is less than the interior circle diameter of bottom, and loop configuration is inside to be the step form, and loop configuration's top is for the throat region (20) that the interior circle diameter is less than the circle diameter in other positions in interior circle diameter.
9. An airflow control member with a shielding function according to claim 8, characterized in that: the thickness of the arc combustion resistant coating (60) is 5-8 mm.
10. An airflow control member with a shielding function according to claim 8, characterized in that: the outer surface turning part of the shielding base body (50) adopts circular arc smooth transition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011389097.1A CN112509853A (en) | 2020-12-02 | 2020-12-02 | Airflow control element with shielding function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011389097.1A CN112509853A (en) | 2020-12-02 | 2020-12-02 | Airflow control element with shielding function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112509853A true CN112509853A (en) | 2021-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011389097.1A Pending CN112509853A (en) | 2020-12-02 | 2020-12-02 | Airflow control element with shielding function |
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| Country | Link |
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| CN (1) | CN112509853A (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1383570A (en) * | 1971-09-01 | 1974-02-12 | Sachsenwerk Licht & Kraft Ag | High-voltage circuit breaker |
| US3889080A (en) * | 1973-12-19 | 1975-06-10 | Westinghouse Electric Corp | Vacuum interrupter shield protector |
| US4236053A (en) * | 1977-09-02 | 1980-11-25 | Hitachi, Ltd. | Puffer type gas circuit breaker |
| JP2009176442A (en) * | 2008-01-22 | 2009-08-06 | Mitsubishi Electric Corp | Switch |
| CN101582348A (en) * | 2009-06-05 | 2009-11-18 | 山东晨鸿电气有限公司 | Low-voltage large-current vacuum arc extinguishing chamber |
| CN201570435U (en) * | 2009-12-24 | 2010-09-01 | 上海思源高压开关有限公司 | Double-action arc extinguish chamber structure |
| CN102074406A (en) * | 2009-11-24 | 2011-05-25 | Abb技术有限公司 | Gas-insulated high-voltage switch |
| CN201918303U (en) * | 2010-12-13 | 2011-08-03 | 北京北开电气股份有限公司 | Up-and-down shielding case |
| CN102592876A (en) * | 2012-03-01 | 2012-07-18 | 广东金晖隆开关有限公司 | Air blowing arc extinguishing load switch |
| KR101188449B1 (en) * | 2011-11-01 | 2012-10-08 | 현대중공업 주식회사 | Instant vaccum circuit breaker |
| CN204102798U (en) * | 2014-08-29 | 2015-01-14 | 国家电网公司 | A kind of SF6 high-voltage breaker explosion chamber with contact shield cover |
| CN204289252U (en) * | 2014-07-22 | 2015-04-22 | 国家电网公司 | A kind of arc-extinguishing chamber of circuit breaker quiet side radome |
| JP2017050212A (en) * | 2015-09-03 | 2017-03-09 | 富士電機株式会社 | Gas Circuit Breaker |
| CN208093437U (en) * | 2017-12-26 | 2018-11-13 | 特变电工中发上海高压开关有限公司 | A kind of electric arc control element |
-
2020
- 2020-12-02 CN CN202011389097.1A patent/CN112509853A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1383570A (en) * | 1971-09-01 | 1974-02-12 | Sachsenwerk Licht & Kraft Ag | High-voltage circuit breaker |
| US3889080A (en) * | 1973-12-19 | 1975-06-10 | Westinghouse Electric Corp | Vacuum interrupter shield protector |
| US4236053A (en) * | 1977-09-02 | 1980-11-25 | Hitachi, Ltd. | Puffer type gas circuit breaker |
| JP2009176442A (en) * | 2008-01-22 | 2009-08-06 | Mitsubishi Electric Corp | Switch |
| CN101582348A (en) * | 2009-06-05 | 2009-11-18 | 山东晨鸿电气有限公司 | Low-voltage large-current vacuum arc extinguishing chamber |
| CN102074406A (en) * | 2009-11-24 | 2011-05-25 | Abb技术有限公司 | Gas-insulated high-voltage switch |
| US20110120975A1 (en) * | 2009-11-24 | 2011-05-26 | Abb Technology Ag | Gas-insulated high-voltage switch |
| CN201570435U (en) * | 2009-12-24 | 2010-09-01 | 上海思源高压开关有限公司 | Double-action arc extinguish chamber structure |
| CN201918303U (en) * | 2010-12-13 | 2011-08-03 | 北京北开电气股份有限公司 | Up-and-down shielding case |
| KR101188449B1 (en) * | 2011-11-01 | 2012-10-08 | 현대중공업 주식회사 | Instant vaccum circuit breaker |
| CN102592876A (en) * | 2012-03-01 | 2012-07-18 | 广东金晖隆开关有限公司 | Air blowing arc extinguishing load switch |
| CN204289252U (en) * | 2014-07-22 | 2015-04-22 | 国家电网公司 | A kind of arc-extinguishing chamber of circuit breaker quiet side radome |
| CN204102798U (en) * | 2014-08-29 | 2015-01-14 | 国家电网公司 | A kind of SF6 high-voltage breaker explosion chamber with contact shield cover |
| JP2017050212A (en) * | 2015-09-03 | 2017-03-09 | 富士電機株式会社 | Gas Circuit Breaker |
| CN208093437U (en) * | 2017-12-26 | 2018-11-13 | 特变电工中发上海高压开关有限公司 | A kind of electric arc control element |
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