CN110797217B - Quick mechanical switch and switch fracture thereof - Google Patents
Quick mechanical switch and switch fracture thereof Download PDFInfo
- Publication number
- CN110797217B CN110797217B CN201810873382.7A CN201810873382A CN110797217B CN 110797217 B CN110797217 B CN 110797217B CN 201810873382 A CN201810873382 A CN 201810873382A CN 110797217 B CN110797217 B CN 110797217B
- Authority
- CN
- China
- Prior art keywords
- contact
- section
- switch
- conduction
- outer contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009413 insulation Methods 0.000 claims abstract description 19
- 230000033001 locomotion Effects 0.000 claims description 6
- 239000002184 metal Substances 0.000 description 16
- 230000005540 biological transmission Effects 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
-
- 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
- H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
- H01H33/38—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
Abstract
The invention relates to a quick mechanical switch and a switch fracture thereof. Quick mechanical switch, including insulating housing, the inside switch fracture that is equipped with of insulating housing, the switch fracture includes interior contact and outer contact, outer contact includes more than two conduction sections that the interval set up and connects the insulation section between adjacent two conduction sections, interior contact has the insulation section one-to-one with outer contact, be used for switching on the conduction section of two conduction sections of corresponding insulation section both ends department, the terminal surface that switches on the front end of section in mechanical switch combined floodgate direction has and is used for and correspondingly switches on the termination structure that the section contact switched on, the other end constitutes circumference normally closed structure with corresponding conduction section. The quick mechanical switch is conducted through the conducting section terminating structure and the normally closed structure of the inner contact and the outer contact, the overtravel of the contacts is nearly zero when the inner contact and the outer contact are conducted, and the quick insulation establishing capacity of the mechanical switch is improved.
Description
Technical Field
The invention relates to the field of high-voltage direct-current transmission equipment, in particular to a quick mechanical switch and a switch fracture thereof.
Background
With the increasing position of power resources in an energy system, the optimization configuration of the power resources is promoted, the efficient development and utilization of renewable energy sources are promoted, the reliable supply of the power is guaranteed, and the economical efficiency and the flexibility of the operation of a power grid are improved, so that the method is the key point of the development of a power utility. The flexible direct-current power transmission plays an increasingly important role in power grid construction due to the advantages of the flexible direct-current power transmission in the aspects of large-scale renewable energy power generation grid connection, island power transmission, multi-end power transmission and the like.
The developed countries in europe and america have proposed a Super Grid (Super Grid) plan to build a wide-area intelligent network based on high-voltage flexible direct-current transmission to integrate resources such as wind power, solar energy, and hydroelectric power generation in north sea, baltic sea, and north africa. The united states also proposed its 2030 Grid plan (Grid 2030), which is intended to build an intelligent power transmission network covering the entire united states to achieve a wide range of power supply and demand balance, compensating each other from seasonal, weather and other differences to improve the Grid efficiency. However, when the high-voltage flexible dc power transmission system fails, a large short-circuit current is generated, and the fault current rises very quickly, which requires that the disconnection be completed in a very short time. The on-off time of the fast switch becomes an important influence factor of the development of high-voltage flexible direct-current transmission.
The utility model discloses a utility model specification that bulletin number is CN204230133U discloses an hypervelocity mechanical switch, this mechanical switch includes the switch fracture, this switch fracture includes first contact (being equivalent to interior contact) and second contact (being equivalent to outer contact), it is first, the second contact is close to relatively or keeps away from under corresponding operating mechanism's drive and realizes closing a floodgate or separating brake, when closing a floodgate first, the second contact all is in the closing position, when separating brake first, the second contact all is in the separating brake position, it is first, be equipped with conductive metal spare (being equivalent to the conduction section) along the direction of motion interval in proper order on the second contact, the position department of spacing between per two adjacent conductive metal spare is insulating. When the switch is switched on, the peripheral surface of the conductive metal piece on the first contact is in contact with the peripheral surface of the corresponding conductive metal piece on the second contact to realize the conduction of the first contact and the second contact. When the first contact is disconnected, at least one conductive metal piece on the first contact is disconnected with the corresponding conductive metal piece on the second contact, and disconnection is completed. The mechanical switch has short contact moving distance and short required time when opening and closing. However, the mechanical switch has larger overtravel, a fracture can be formed only by long displacement, the insulation building time is longer, and the on-off time of the switch is greatly limited; in addition, the contact with the outside switching position in the structure has the rapid weight increase along with the lifting of the current capacity, and the effectiveness of the driving mechanism is greatly limited. This mechanism limits the current carrying capacity of the fast switch and increases the insulation build-up time.
Disclosure of Invention
The invention aims to provide a quick mechanical switch to solve the overtravel problem of a mechanical switch contact; the invention also aims to provide a switch fracture suitable for the rapid mechanical switch.
In order to achieve the purpose, the technical scheme of the quick mechanical switch is as follows:
the technical scheme 1: quick mechanical switch, including insulating housing, the inside switch fracture that is equipped with of insulating housing, the switch fracture includes interior contact and outer contact, and outer contact switches on the section and connects the insulating section between adjacent two conduction sections more than two that the interval set up, and interior contact has with the insulating section one-to-one of outer contact, be used for switching on the conduction section of two conduction sections of corresponding insulating section both ends department, the terminal surface that switches on the section at the ascending front end of mechanical switch combined floodgate direction has and is used for and correspondingly switches on the termination structure that the section contact switched on, and the other end constitutes circumference normally closed structure with the corresponding section that switches on.
Has the advantages that: the quick mechanical switch is conducted through the conducting section terminating structure and the normally closed structure on the inner contact and the outer contact, the overtravel of the contacts is nearly zero when the inner contact and the outer contact are conducted, the quick insulation establishing capacity of the mechanical switch is improved, the overtravel is small, the required stroke for insulation establishing is correspondingly reduced, the quick movement speed is effectively reduced, and the impact stress borne by components is reduced. The terminating structure reduces the abrasion degree of the contact surface of the conducting section after the rapid switch is used for a long time, thereby increasing the use stability of the rapid switch.
The technical scheme of the switch fracture is as follows:
the technical scheme 1: switch fracture, including interior contact and outer contact, outer contact includes that the interval sets up two above conduction sections and connects the insulating section between adjacent two conduction sections, interior contact have with the insulating section one-to-one of outer contact, be used for switching on the conduction section of two conduction sections of corresponding insulating section both ends department, the terminal surface that switches on the section front end in mechanical switch combined floodgate direction has and is used for and correspondingly switches on the termination structure that the section contact switched on, and the other end constitutes circumference normally closed structure with corresponding conduction section.
Has the advantages that: the conduction section terminating structure and the normally closed structure on the inner contact and the outer contact are conducted, the overtravel of the contacts is nearly zero when the inner contact and the outer contact are conducted, the quick insulation establishing capacity of the mechanical switch is improved, the overtravel is small, the required stroke for establishing insulation is correspondingly reduced, the quick movement speed is effectively reduced, and the impact stress born by the components is reduced. The terminating structure reduces the abrasion degree of the contact surface of the conducting section after the rapid switch is used for a long time, thereby increasing the use stability of the rapid switch.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a fast mechanical switch of the present invention;
FIG. 2 is a schematic view of the break of the switch during opening;
FIG. 3 is a schematic view of a break in the switch during closing;
in the drawings: 1. a switch break; 110. an outer contact; 111. a conducting section A; 112. a conducting section B; 113. a conducting section C; 114. a conducting section D; 120. an inner contact; 121. a conducting segment a; 122. a conducting section b; 123. a conducting section c; 2. an insulating cylinder; 3. an incoming terminal; 4. a conductive barrel; 5. electrically connecting; 6. a conductive contact finger; 7. a metal tie rod; 8. a gas circuit; 9. a gas joint; 10. an outlet terminal; 11. an insulating block; 12. an insulating block; 13. a brake separating coil; 14. a repulsive force plate; 15. a closing coil; 16. a holding mechanism; 161. a cover plate; 162. connecting plates; 163. a spring; 164. a slider; 165. a holding member.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The specific embodiment of the fast mechanical switch of the invention, as shown in fig. 1 to fig. 3, comprises a sealed insulating cylinder 2, wherein the upper end of the insulating cylinder 2 is fixedly provided with a wire inlet terminal 3 for connecting a wire inlet, the lower end of the wire inlet terminal 3 is connected with a conductive cylinder 4, the conductive cylinder 4 is connected with a switch fracture 1 through an electric connection 5, and a conductive contact finger 6 is arranged between the conductive cylinder 4 and the electric connection 5. The switch fracture 1 comprises an outer contact 110 and an inner contact 120, the outer contact 110 is fixedly connected with an outlet terminal 10, and the inner contact 120 penetrates through the outlet terminal 10 to be connected with an operating mechanism for driving the inner contact 120 to be opened and closed with the outer contact 110.
The outer contact 110 in the present invention is a cylindrical structure, the inner wall of the cylindrical outer contact 110 has conducting sections with different diameters, the conducting sections are circumferentially arranged on the inner wall of the outer contact 110 at intervals, an insulating section is arranged between adjacent conducting sections, and the center of the outer contact 110 forms a cavity. The conducting sections are distributed in a trapezoidal shape inside the outer contact 110 according to the diameter. The uppermost conductive segment of the outer contact 110 has the smallest diameter and the lowermost conductive segment has the largest diameter. The outer contact 110 in this embodiment has four conducting segments, which are a conducting segment a111, a conducting segment B112, a conducting segment C113, and a conducting segment D114 from top to bottom, wherein the conducting segment a111 has the smallest diameter. The conducting section D114 at the bottom of the outer contact 110 is connected to the outlet terminal 10. The inner contact 120 is also a cylindrical structure, and the outer wall of the cylindrical inner contact 120 has conducting sections with different diameters, and the conducting sections are circumferentially arranged on the outer wall of the inner contact 120 at intervals. The conducting sections are distributed in a trapezoidal shape on the outer wall of the inner contact 120 according to the diameter. The diameter of the uppermost conducting section of the inner contact 120 is the smallest, the diameter of the lowermost conducting section is the largest, and two adjacent conducting sections are insulated. The inner contact 120 in this embodiment has three conducting segments, which are a conducting segment a121, a conducting segment b122, and a conducting segment c123 from top to bottom, wherein the conducting segment c123 has the largest diameter.
When the switch fracture 1 of the fast switch of the invention is opened, as shown in fig. 2, the conducting section a111 on the outer contact 110 is disconnected from the conducting section a121 on the inner contact 120, the conducting section a111 on the outer contact 110 is insulated from the conducting section a121 on the inner contact 120 by the insulating part on the contact and the insulating gas filled in the fracture, and the outer contact 110 and the inner contact 120 are in the breaking state, so that the fast switch is opened. When the switch break 1 is closed, as shown in fig. 3, the lower end surface of the conducting segment a111 on the outer contact 110 is connected to the upper end surface of the conducting segment a121 on the inner contact 120, the outer peripheral surface of the conducting segment a121 is connected to the outer peripheral surface of the conductive metal B112, the upper end surface of the conducting segment B122 is in contact with the lower end surface of the conducting segment B112, the outer peripheral surface of the conducting segment B122 is in contact with the outer peripheral surface of the conducting segment C113, the upper end surface of the conducting segment C123 is in contact with the lower end surface of the conducting segment C113, and the outer peripheral surface of the conducting segment C123 is in contact with the outer peripheral surface of the conducting segment D114. The conducting section on the outer contact 110 and the conducting section on the inner contact 120 are in a contact mode that end surface contact and peripheral surface contact are crossed. When the switch is switched on, the current sequentially flows through the conduction section on the outer contact 110 and the conduction section on the inner contact 120 matched with the conduction section on the outer contact 110 to realize the conduction between the outer contact 110 and the inner contact 120, so that the switch-on purpose is achieved.
The quick mechanical switch is characterized in that the outer part of the insulating cylinder 2 is also connected with a gas connector 9, and the gas connector 9 fills insulating gas into the insulating cylinder 2 through a gas path 8. The lower end of the inner contact 120 in the invention is connected with an operating mechanism for controlling the opening and closing of the inner contact 120 and the outer contact 110. The operating mechanism comprises a metal pull rod 7 connected with an inner contact, a repulsion disc 14 is fixed on the metal pull rod 7, the plane of the repulsion disc 14 is perpendicular to the metal pull rod 7, two insulating blocks 11 and 12 are respectively arranged around the repulsion disc 14, the insulating blocks 11 and the insulating blocks 12 are identical in structure, grooves with opposite openings and with openings facing the repulsion disc 14 are respectively arranged on the insulating blocks 11 and 12, the grooves of the insulating blocks 11 and 12 are matched with the periphery of the repulsion disc 14, an opening coil 13 and a closing coil 15 are respectively fixedly arranged at the bottoms of the grooves, the outer diameters of the opening coil 13 and the closing coil 15 are identical to the outer diameter of the repulsion disc 14 and are matched with the groove diameter of the grooves, and the opening coil 13 and the closing coil 15 are both parallel to the repulsion disc 14 and are positioned at two sides of the repulsion disc 14.
The working process of the embodiment of the fast mechanical switch of the invention is as follows: when the switch is opened, the switch fracture 1 is at the switch-on position, that is, the outer contact 110 and the inner contact 120 are in the switch-on state, the pulse current energizes the opening coil 13, the repulsion plate 14 generates an induced eddy current, the induced eddy current is opposite to the current direction of the opening coil 13, and the repulsion plate 14 and the opening coil 13 generate repulsion force, so that the repulsion plate 14 drives the metal pull rod 7 to move downwards, thereby realizing the purpose of opening the switch. When the switch is switched on, the switch fracture 1 is at a switch-off position, the outer contact 110 and the inner contact 120 are in a switch-off state, the pulse current is conducted to the switch-on coil 15, the repulsion plate 14 generates an induced eddy current, the direction of the induced eddy current is opposite to that of the current of the switch-on coil 15, the repulsion plate 14 and the switch-on coil 15 generate repulsion force, and therefore the repulsion plate 14 drives the metal pull rod 7 to move upwards, and the switch-on purpose is achieved. In the whole opening process, the spring 163 in the opening and closing retaining mechanism 16 is in the earlier stage of movement of the repulsion plate 14, the sliding block 164 approaches to the limiting cylinder, the spring 163 is compressed, when the metal pull rod 7 drives the sliding block 164 to move downwards to pass through the limiting sleeve, the spring 163 extends, when the metal pull rod 7 moves to a certain position, the spring 163 can apply a retaining force to the sliding block 164 and the retaining part 165, and the metal pull rod 7 is kept at the opening position. The principle of the closing process and the retaining mechanism 16 is similar to that of the opening process, and the description is omitted. The outer contact 110 and the inner contact 120 in this embodiment are both tubular, and in other embodiments, the inner hole may be a quadrilateral, a triangle, or a hexagon.
In other embodiments, the number of the conducting segments on the outer contact can be any other number, such as two, four, five, etc.
The switch fracture structure in the embodiment of the switch fracture is the same as that in each embodiment of the rapid mechanical switch, and the detailed description is omitted.
Claims (11)
1. Quick mechanical switch, including insulating housing, the inside switch fracture that is equipped with of insulating housing, the switch fracture includes interior contact and outer contact, and the outer contact switches on the section and connects the insulating section between adjacent two conduction sections more than two that the interval set up, and interior contact has with the insulating section one-to-one of outer contact, be used for switching on the section that switches on of two conduction sections at corresponding insulating section both ends department, its characterized in that: the end face of the front end of the conducting section in the closing direction of the mechanical switch is provided with a terminating structure used for being in contact conduction with the corresponding conducting section, and the other end of the conducting section and the corresponding conducting section form a circumferential normally closed structure; the quick insulation building capability of the mechanical switch is improved, the stroke required by insulation building is correspondingly reduced, the quick movement speed is effectively reduced, and the impact stress borne by the component is reduced.
2. The fast mechanical switch of claim 1, wherein: the front end face of the conduction section on the inner contact is in contact conduction with the rear end face of the corresponding conduction section on the outer contact.
3. The fast mechanical switch according to claim 2, wherein: each conducting section on the inner contact and the outer contact is arranged in a step shape.
4. A fast mechanical switch according to any of claims 1 to 3, characterized in that: the number of the conduction sections on the inner contact is three, and the number of the conduction sections on the outer contact is four.
5. A fast mechanical switch according to any of claims 1 to 3, characterized in that: and insulating gas is filled between the inner contact and the outer contact.
6. A fast mechanical switch according to any of claims 1 to 3, characterized in that: the outer contact is fixedly connected with the shell through a conductive structure, and the inner contact is connected with an operating mechanism used for being pushed in and pulled out from the outer contact.
7. Switch fracture, including interior contact and outer contact, outer contact includes that the interval sets up two more than switch on the section and connect the insulating section between adjacent two switch on sections, interior contact have with the insulating section one-to-one of outer contact, be used for switching on the section that switches on of two of corresponding insulating section both ends department, its characterized in that: the end face of the front end of the conducting section in the closing direction of the mechanical switch is provided with a terminating structure used for being in contact conduction with the corresponding conducting section, and the other end of the conducting section and the corresponding conducting section form a circumferential normally closed structure; the quick insulation building capability of the mechanical switch is improved, the stroke required by insulation building is correspondingly reduced, the quick movement speed is effectively reduced, and the impact stress borne by the component is reduced.
8. The switch break of claim 7, characterized in that: the front end face of the conduction section on the inner contact is in contact conduction with the rear end face of the corresponding conduction section on the outer contact.
9. The switch break of claim 8, characterized in that: each conducting section on the inner contact and the outer contact is arranged in a step shape.
10. The switch break of any one of claims 7 to 9, characterized in that: the number of the conduction sections on the inner contact is three, and the number of the conduction sections on the outer contact is four.
11. The switch break of any one of claims 7 to 9, characterized in that: and insulating gas is filled between the inner contact and the outer contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810873382.7A CN110797217B (en) | 2018-08-02 | 2018-08-02 | Quick mechanical switch and switch fracture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810873382.7A CN110797217B (en) | 2018-08-02 | 2018-08-02 | Quick mechanical switch and switch fracture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110797217A CN110797217A (en) | 2020-02-14 |
| CN110797217B true CN110797217B (en) | 2022-03-29 |
Family
ID=69425938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810873382.7A Active CN110797217B (en) | 2018-08-02 | 2018-08-02 | Quick mechanical switch and switch fracture thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110797217B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111415830B (en) * | 2020-02-25 | 2022-03-29 | 平高集团有限公司 | Electromagnetic repulsion force operating mechanism and switch using same |
| CN113161193B (en) * | 2020-11-27 | 2022-08-30 | 平高集团有限公司 | Vacuum circuit breaker and vacuum arc extinguish chamber |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03110725A (en) * | 1989-09-22 | 1991-05-10 | Tanaka Kikinzoku Kogyo Kk | Rivet contact |
| DE19517615A1 (en) * | 1995-05-13 | 1996-11-14 | Abb Research Ltd | Circuit breaker |
| CN101950697A (en) * | 2010-10-14 | 2011-01-19 | 句容市华通电器有限公司 | Fixed contact |
| CN204230133U (en) * | 2014-10-16 | 2015-03-25 | 平高集团有限公司 | Ultrahigh speed mechanical switch and switch fracture thereof and switch contact thereof |
| CN104616927A (en) * | 2015-02-03 | 2015-05-13 | 广东金晖隆开关有限公司 | Blowing arc extinguishing chamber of breaker |
| CN204966812U (en) * | 2015-08-25 | 2016-01-13 | 重庆民生变压器有限责任公司 | Inside and outside cascaded large tracts of land short stroke electric power binding post |
-
2018
- 2018-08-02 CN CN201810873382.7A patent/CN110797217B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03110725A (en) * | 1989-09-22 | 1991-05-10 | Tanaka Kikinzoku Kogyo Kk | Rivet contact |
| DE19517615A1 (en) * | 1995-05-13 | 1996-11-14 | Abb Research Ltd | Circuit breaker |
| CN101950697A (en) * | 2010-10-14 | 2011-01-19 | 句容市华通电器有限公司 | Fixed contact |
| CN204230133U (en) * | 2014-10-16 | 2015-03-25 | 平高集团有限公司 | Ultrahigh speed mechanical switch and switch fracture thereof and switch contact thereof |
| CN104616927A (en) * | 2015-02-03 | 2015-05-13 | 广东金晖隆开关有限公司 | Blowing arc extinguishing chamber of breaker |
| CN204966812U (en) * | 2015-08-25 | 2016-01-13 | 重庆民生变压器有限责任公司 | Inside and outside cascaded large tracts of land short stroke electric power binding post |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110797217A (en) | 2020-02-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110797217B (en) | Quick mechanical switch and switch fracture thereof | |
| CN102360851B (en) | Combined permanent-magnetic mechanism voltage/capacity adjusting switch | |
| CN104810200A (en) | Super-quick vacuum switch device | |
| CN202339881U (en) | Fast horizontal type vacuum switch for flexible power transmission | |
| CN205069503U (en) | Monostable permanent magnetic mechanism and vacuum circuit breaker | |
| CN111627749A (en) | Bistable spring retaining device with buffering function for electromagnetic repulsion mechanism and method | |
| CN102426975A (en) | Permanent magnetic operation mechanism | |
| CN204632662U (en) | Supper-fast vacuum switching device | |
| CN105185648A (en) | Vacuum switch tube | |
| CN202339884U (en) | Permanent operating mechanism | |
| CN201576608U (en) | Conductive switch blade device of high voltage isolation switch | |
| CN104332351A (en) | Soft connection device and embedded pole using the same | |
| CN111146040B (en) | High-power alternating current variable frequency alternating current vacuum contactor of aviation variable frequency power supply system | |
| CN100454461C (en) | Double-fracture combination column type superhigh voltage multiplier breaking circuit breaker | |
| CN2909495Y (en) | Double-break combined column superhigh voltage multi-speed breaking circuit breaker | |
| CN202487484U (en) | Indoor high pressure vacuum breaker | |
| CN105390333A (en) | Fast double-power transfer switch and switching control method | |
| CN203339048U (en) | Colum vacuum circuit breaker | |
| CN204834386U (en) | Electromagnetic type electrical switching | |
| CN203967004U (en) | A kind of transmission line is from recovering blow-out device | |
| CN202153499U (en) | Fast-assembling vacuum load switch for no power-off operation | |
| CN205122469U (en) | Vacuum switch tube | |
| CN204480949U (en) | A kind of outdoor AC high-voltage isolating switch | |
| CN219958865U (en) | Split type fast switch | |
| CN202183332U (en) | Outdoor alternating current (AC) high-voltage switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |