CN104979126B - A kind of extra-high voltage direct-current earthed switch - Google Patents
A kind of extra-high voltage direct-current earthed switch Download PDFInfo
- Publication number
- CN104979126B CN104979126B CN201510345010.3A CN201510345010A CN104979126B CN 104979126 B CN104979126 B CN 104979126B CN 201510345010 A CN201510345010 A CN 201510345010A CN 104979126 B CN104979126 B CN 104979126B
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- China
- Prior art keywords
- contact tube
- fixed
- pull bar
- support
- bottom contact
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
- H01H31/026—Movable parts and contacts mounted thereon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
- H01H21/54—Lever switches with blade-type contact co-operating with one or two spring-clip contacts, e.g. knife switch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
A kind of extra-high voltage direct-current earthed switch of the present invention, including support, the grounding static contact and earthing switch blade being equipped with, the support insulator being fixed on support and support beam, and for driving earthing switch blade operating mechanism and separating brake support frame for supported grounding plug-in strip；By the composite post insulator structure of queen post, product overall structure stability and reliability are effectively enhanced；Earthing switch blade uses vertical-telescopic structure, and the operation of contact tube progress divide-shut brake is driven using driving push rod so that improves the reliability of product in contact tube and driving push rod the formation triangular structure of "on" position；The contact tube of folding is driven from the pull bar of inside, set by the pull bar center of rotation different with bottom contact tube, the pull-up operation to contact tube can be completed in closing operation, and the folding driving in sub-switching operation, and the transmission for passing through gearcase, it ensure that the equity of two mechanisms, and division gate position being fixed and being stably connected with.
Description
Technical field
The present invention relates to high-tension apparatus field, specially a kind of extra-high voltage direct-current earthed switch.
Background technology
In recent years, D.C. high voltage transmission is had become with the advantages that its transmission line capability is big, transmission distance is remote, economy is strong
The important development direction of power system, voltage class improve constantly, and the country has had a plurality of ± 800kV extra-high voltage direct-currents defeated at present
Electric line is put into operation, and ± 1100kV transmission line of electricity is planned.According to State Grid Corporation of China's extra-high voltage project construction rule
Draw, " three China " (North China, East China, Central China) extra-high voltage grid will be built up by 2015, form " a three vertical three horizontal looped networks ", and will build
Into 11 times extra-high voltage direct-current transmission engineerings.Extra-high voltage direct-current earthed switch is a kind of important in extra-high voltage direct-current transformer station sets
It is standby.Therefore, it is necessary to develop the extra-high voltage direct-current earthed switch that a kind of stability is good, reliability is high, existing earthed switch all without
Method meets its requirement.
The content of the invention
For problems of the prior art, the present invention provides a kind of unique structure, reliable and stable, easy to operate, holds
The extra-high voltage direct-current earthed switch of easy care.
The present invention is to be achieved through the following technical solutions：
A kind of extra-high voltage direct-current earthed switch, including support, the grounding static contact and earthing switch blade being equipped with, are fixed on
Support insulator and support beam on support, and for driving earthing switch blade operating mechanism and dividing for supported grounding plug-in strip
Lock support frame；
Grounding static contact is fixed on the top of symmetrically arranged support insulator, the bottom of support insulator by connecting plate
It is fixed in support beam；
Earthing switch blade includes the moving contact being sequentially connected, and contact tube, the first connecting lever, gearcase, bottom contact tube, second turns
Arm and base, and it is arranged on the pull bar inside the contact tube of bottom and the drive mechanism being arranged on outside the contact tube of bottom；It is conductive
Pipe is connected with for forming being flexible coupling for electric pathway with bottom contact tube；
Meshed gears and rack are set in gearcase；The gear shaft being rotatably arranged on gearcase is fixed with gear, and
It is fixedly connected through gearcase with the first connecting lever；
Second connecting lever is hinged on base by rotary shaft；One end connection rack of pull bar, the other end are cut with scissors by pull rod shaft
It is connected on base；Pull rod shaft is arranged on the axis of bottom contact tube, and rotary shaft is arranged on the axis of bottom contact tube
Side；
Drive mechanism includes being arranged on the clamping plate outside the contact tube of bottom, and the driving being hinged on by axle on base pushes away
Bar；The other end of driving push rod is hinged with clamping plate, and driving push rod is arranged with bottom contact tube in angle；Axis connection actuating machine
The output end of structure.
Preferably, the top of support insulator is provided with pressure-equalizing device, and described pressure-equalizing device includes junction and is arranged on branch
The upper grading ring and lower uniform pressure ring on post insulator top；Connecting plate is arranged between grading ring and lower uniform pressure ring.
Preferably, grounding static contact includes the binding post being fixed on connecting plate, and is successively set on binding post
On connecting seat, fingertip and in horn-like guide sleeve；For coordinating the fingertip electrically connected to be arranged on by spring with moving contact
On connecting seat, the end of fingertip is provided with the guide sleeve being fixed on connecting seat；The outer cover of fingertip is provided with and is fixed on connecting seat
On radome.
Further, connecting seat is connected on binding post by rotating shaft, and torsion spring is provided between connecting seat and binding post；
The bent plate fixed with binding post is arranged with rotating shaft, bent plate is used to limit amplitude of fluctuation of the connecting seat on torsion direction.
Preferably, top contact tube is provided between contact tube and the first connecting lever；The upper end of top contact tube passes through anchor ear
It is fixedly connected with contact tube.
Preferably, guide pad is fixedly installed on pull bar, guide pad is slidably connected with bottom contact tube inwall.
Preferably, the bottom fixed cover on pull bar is provided with push rod, and the connection of push rod upper end is set in the disc spring on pull bar, disc spring
Upper end fixed by the fixed block being fixed in the contact tube of bottom；It is provided with and is set on pull bar between pull bar inside disc spring
Guide pipe.
Preferably, the output end of operating mechanism passes sequentially through bearing block, drives pull bar and the 3rd connecting lever and axis connection；Bearing
Seat is fixedly installed on base, and driving pull bar one end is rotatably connected on bearing block, and the other end is hinged on one end of the 3rd connecting lever；
The free end of 3rd wall built-up is fixedly connected with axle.
Preferably, it is fixedly installed counterbalance device along the direction opposite with bottom contact tube in rotary shaft.
Preferably, support beam uses channel steel support, and support uses steel bracket.
Compared with prior art, the present invention has technique effect beneficial below：
The present invention uses the composite post insulator structure of queen post, effectively enhances product overall structure stability and can
By property；Earthing switch blade uses vertical-telescopic structure, and the operation of contact tube progress divide-shut brake is driven using driving push rod so that
The contact tube of "on" position improves the reliability of product with driving push rod formation triangular structure；From internal pull bar to folding
Contact tube be driven, set, can be completed in closing operation by the pull bar center of rotation different with bottom contact tube
Pull-up operation to contact tube, and the folding driving in sub-switching operation, and by the transmission of gearcase, ensure that two works
With the equity of process, and division gate position being fixed and being stably connected with, simple in construction, ingenious in design, easy to operate, safeguards letter
It is single；And using the separating brake support frame set, force-bearing situation of the product in open position can be effectively improved, improves product
Reliability.
Further, using the pressure-equalizing device for including upper grading ring and lower uniform pressure ring, good shielding harness, energy are formd
The Electric Field Distribution of product is enough effectively improved, improves the insulating properties of product.
Further, can be the company of moving contact and static contact by the setting of horn-like guide sleeve in grounding static contact
Connect and improve certain guide function, preferably by torsion spring can grounding static contact swung in the range of certain angle, have
There is good guide function, can effectively ensure the operational stability and reliability of earthed switch.
Further, by grounding static contact set spring structure, ensure that the clamping force of fingertip so that moving contact and
Fingertip reliable contacts, increase the reliability of product；And by the setting of Mume flower contact, it is set to possess the larger short circuit current of carrying
Ability, improve the security reliability of total.
Further, using the setting of anchor ear and top contact tube, enable to the length of conductive plug-in strip can be certain
Degree, which is realized, to be changed, and is easily facilitated adjustment, is effectively improved the adaptability of product.
Further, balanced respectively in difference by using internal disk spring energy storage, and the mode of external balance hammer energy storage
The mode that contact tube is conducted oneself with dignity during operation realizes the control to balance, effectively increases the equilibrium response of product.
Further, by using the actuating transmission of driving pull bar, the adjustability of transmission is ensure that, and improve transmission
Efficiency, improve overall reliability.
Further, by using the support beam and support of steel, its service life is improved, can be carried out convenient
Plant maintenance.
Brief description of the drawings
Fig. 1 is general assembly structural representation described in present example；Fig. 1 a are side view, and Fig. 1 b are left view.
Fig. 2 is the structural representation of balanced pressure system described in invention example.
Fig. 3 is the structural representation of grounding static contact described in invention example.
Fig. 4 is the structural representation of earthing switch blade described in invention example.
Fig. 5 is the flexible joint part structural representation of earthing switch blade described in invention example.
Fig. 6 is earthed switch divide-shut brake principle schematic described in invention example.
In figure：1 is grounding static contact；2 be earthing switch blade；3 be support insulator；4 be support beam；5 be support；6 are
Operating mechanism；7 be separating brake support frame；8 be upper grading ring；9 be lower uniform pressure ring；10 be connecting plate；11 be bent plate；12 be terminals
Son；13 be torsion spring；14 be connecting seat；15 be radome；16 be fingertip；17 be spring；18 be guide sleeve；19 be moving contact；20
For contact tube；21 be anchor ear；22 be top contact tube；23 be the first connecting lever；24 be gearcase；25 be gear；26 be rack；27
For pull bar；28 be guide pad；29 be clamping plate；30 be fixed block；31 be disc spring；32 be guide pipe；33 be push rod；34 turn for second
Arm；35 be base；36 be driving pull bar；37 be bearing block；38 be counterbalance device；39 be the 3rd connecting lever；40 be axle；41 be drive
Dynamic push rod；42 be to be flexible coupling；43 be rotary shaft；44 be support shaft；45 be bottom contact tube；46 be gear shaft；Pull rod shaft 47.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
A kind of extra-high voltage direct-current earthed switch of the present invention, as shown in figure 1, including grounding static contact 1, earthing switch blade 2, pillar
Insulator 3, support beam 4, support 5, operating mechanism 6 and separating brake support frame 7；Support beam 4 is preferably made of channel-section steel, branch
Frame 5 is preferably adopted and is made of a steel；Wherein earthing switch blade 2 is arranged in support beam 4；Support beam 4 is arranged on support 5；Behaviour
Motivation structure is arranged on support 5, and is connected with earthing switch blade 2；Support insulator 3 is fixed on support 5；Grounding static contact 1 is solid
It is scheduled on the upper end of support insulator 3；As depicted in figs. 1 and 2, the top of support insulator 3 is provided with pressure-equalizing device, and pressure-equalizing device includes
Upper grading ring 8 and lower uniform pressure ring 9, the junction of upper grading ring 8 and lower uniform pressure ring 9 are arranged on 3 top of support insulator；Even
Fishplate bar 10 is installed between grading ring 8 and lower uniform pressure ring 9；Grounding static contact 1 is arranged on the centre position of connecting plate 10；Separating brake
Support frame 7 is arranged on the open position of earthing switch blade 2.The both sides of preferable separating brake support frame 7 are provided with grading ring.
As shown in figures 1 and 3, grounding static contact 1 includes bent plate 11, binding post 12, torsion spring 13, connecting seat 14, shielding
Cover 15, fingertip 16, spring 17 and guide sleeve 18；Its middle connecting terminal 12 is arranged on connecting plate 10；The one end of bent plate 11 is arranged on
On binding post 12, the other end is connected with connecting seat 14；Torsion spring 13 is installed between binding post 12 and connecting seat 14, the company of realization
Reset of the joint chair 14 on the torsion direction of torsion spring 13 is swung；Radome 15 is installed on the lower end of connecting seat 14；Fingertip 16 is arranged on
On connecting seat 14；In the installation of spring 17 and fingertip 16, fingertip 16 preferably uses plum blossom fingertip；Guide sleeve 18 is arranged on radome
On 15.
As shown in Figure 4 and Figure 5, earthing switch blade 2 is vertical-telescopic structure, including moving contact 19, contact tube 20, anchor ear
21st, top contact tube 22, the first connecting lever 23, gearcase 24, gear 25, rack 26, pull bar 27, guide pad 28, clamping plate 29, fixation
Block 30, disc spring 31, guide pipe 32, push rod 33, second largest connecting lever 34, base 35, driving pull bar 36, bearing block 37, counterweight dress
Put the 38, the 3rd connecting lever 39, driving push rod 41；Wherein moving contact 19 is fixed on the upper end of contact tube 20；Contact tube 20 and upper guide
Fulgurite 22 is connected by anchor ear 21；The lower end of top contact tube 22 is fixed on the first connecting lever 23；The upper end peace of bottom contact tube 45
Equipped with gearcase 24；Gear 25 is arranged in gearcase 24；After gear 25 is fixedly connected with the first connecting lever 23 by gear shaft 46
Set in linkage；Gear 25 is rotatablely connected by axle sleeve and bottom contact tube 45；Top contact tube 22 and bottom contact tube 45 it
Between be provided with and be flexible coupling 42；The lower end of bottom contact tube 45 is connected with the second connecting lever 34；Second connecting lever 34 and base 35 pass through rotation
Rotating shaft 43 is connected；Clamping plate 29 is on installation bottom contact tube 45；One end of driving push rod 41 and clamping plate 29 pass through the phase of support shaft 44
Even, the other end and the 3rd connecting lever 39 are connected by axle 40；Bearing block 37 is installed on base 35；Driving pull bar 36 is installed on bearing
Between seat 37 and connecting lever 39；Counterbalance device 38 is arranged in rotary shaft 43；Base 35 is arranged in support beam 4；Rack 26
Being engaged with gear 25, rack 26 is connected with pull bar 27, and in installation and bottom contact tube 45；Guide pad 28 is fixed on pull bar 27
On；Fixed block 30 is arranged on bottom contact tube 45；Push rod 33 is arranged on pull bar 27；Disc spring 31 is installed on pull bar 27, between
Between fixed block 30 and push rod 33；Guide pipe 32 is arranged between disc spring 31 and pull bar 27, and the end of pull bar 27 is connected to base
In the pull rod shaft 47 set on 35, pull rod shaft 47 is placed in rotary shaft 43.
Wherein, base 35 preferably uses welded-steel plate construction, and the rotary part use of bearing block 37 and earthing switch blade is entirely
Sealed bearing structure, there is the advantages of transmission efficiency, non-maintaining, facilitate plant maintenance, while improve service life；It is dynamic to touch
First 19 use red copper bar and copper pipe welded structure, and fingertip 16 is using the technique of copper tube machine add-on type, leading in earthing switch blade 2
Fulgurite is welded using the aluminium-alloy pipe of high intensity, ensures that product has good mechanical strength and corrosion resistance.
The operation principle of the earthed switch of the present invention, as shown in fig. 6, when earthed switch closes a floodgate, operating mechanism 6 drives ground connection
Plug-in strip 2 goes to closing position along combined floodgate direction from open position, drives bearing block 37 to rotate by operating mechanism 6, so that
Driving pull bar 36 drives the 3rd connecting lever 39 to rotate, and rotates driving push rod 41 by axle 40, then drive bottom contact tube 45 around rotation
Rotating shaft 43 rotates to upright position from horizontal level, because pull bar 27 is different with the center of rotation of bottom contact tube 45, makes pull bar
27 and bottom contact tube 45 produce relative displacement so that rack 26 promote gear 25 rotate, make the top being connected with gear 25
Relative motion occurs for the opposing lower portions contact tube 45 of contact tube 22, and top contact tube 22 goes to upright position by horizontal level, moves and touches
First 19 are also inserted into grounding static contact 1, complete the whole actions closed a floodgate from separating brake band.In addition, while pull bar 27 rotates, dish
Spring 31 and counterbalance device 38 start simultaneously at energy storage or release energy, to balance the trimming moment of earthing switch blade 2, ensure earthed switch
Smoothly realize divide-shut brake；Counterbalance device 38 realizes energy storage under gate-dividing state, and disc spring 31 realizes energy storage under "on" position.
Claims (3)
- A kind of 1. extra-high voltage direct-current earthed switch, it is characterised in that including support (5), the grounding static contact being equipped with (1) and Earthing switch blade (2), the support insulator (3) being fixed on support (5) and support beam (4), and for driving earthing switch blade (2) operating mechanism (6) and the separating brake support frame (7) for supported grounding plug-in strip (2)；Described grounding static contact (1) is fixed on the top of symmetrically arranged support insulator (3), pillar by connecting plate (10) The bottom of insulator (3) is fixed in support beam (4)；Described earthing switch blade (2) includes the moving contact (9) being sequentially connected, contact tube (20), the first connecting lever (23), gearcase (24), bottom contact tube (45), the second connecting lever (34) and base (35), and it is arranged on the internal pull bar of bottom contact tube (45) (27) and it is arranged on the outside drive mechanism of bottom contact tube (45)；Contact tube (20) is connected with bottom contact tube (45) to be used for Form being flexible coupling (42) for electric pathway；Meshed gears (25) and rack (26) are set in described gearcase (24)；The tooth being rotatably arranged on gearcase (24) Wheel shaft (46) is fixed with gear (25), and is fixedly connected through gearcase (24) with the first connecting lever (23)；Described the second connecting lever (34) is hinged on base (35) by rotary shaft (43)；One end connection rack of pull bar (27) (26), the other end is hinged on base (35) by pull rod shaft (47)；Pull rod shaft (47) is arranged in bottom contact tube (45) On axis, rotary shaft (43) is arranged on the side of the axis of bottom contact tube (45)；Described drive mechanism includes being arranged on the outside clamping plate (29) of bottom contact tube (45), and is hinged on by axle (40) Driving push rod (41) on base (35)；The other end of driving push rod (41) is be hinged with clamping plate (29), and driving push rod (41) Arranged with bottom contact tube (45) in angle；The output end of axle (40) connection operating mechanism (6)；Grounding static contact (1) includes the binding post (12) being fixed on connecting plate (10), and is successively set on binding post (12) connecting seat (14), fingertip (16) on and in horn-like guide sleeve (18)；Electrically connected for coordinating with moving contact (19) Fingertip (16) by spring (17) be arranged on connecting seat (14) on, the end of fingertip (16), which is provided with, is fixed on connecting seat (14) On guide sleeve (18)；The outer cover of fingertip (16) is provided with the radome (15) being fixed on connecting seat；Connecting seat (14) is connected on binding post (12) by rotating shaft, is provided between connecting seat (14) and binding post (12) Torsion spring (13)；The bent plate (11) fixed with binding post (12) is arranged with rotating shaft, bent plate (11) is used to limit connecting seat (14) Amplitude of fluctuation on torsion direction；In rotary shaft (43) counterbalance device (38) is fixedly installed along the direction opposite with bottom contact tube (45)；Top contact tube (22) is provided between contact tube (20) and the first connecting lever (23)；The upper end of top contact tube (22) passes through Anchor ear (21) is fixedly connected with contact tube (20)；Guide pad (28) is fixedly installed on pull bar (27), guide pad (28) is slidably connected with bottom contact tube (45) inwall；The bottom fixed cover of (27) is provided with push rod (33) on pull bar, and the connection of push rod (33) upper end is set in the disc spring on pull bar (27) (31), the upper end of disc spring (31) is fixed by the fixed block (30) being fixed in bottom contact tube (45)；Disc spring (31) it is internal with The guide pipe (32) being set on pull bar (27) is provided between pull bar (27)；The output end of operating mechanism (6) passes sequentially through bearing block (37), driving pull bar (36) and the 3rd connecting lever (39) and axle (40) Connection；Bearing block (37) is fixedly installed on base (35), and driving pull bar (36) one end is rotatably connected on bearing block (37), separately One end is hinged on one end of the 3rd connecting lever (39)；The free end of 3rd connecting lever (39) is fixedly connected with axle (40).
- A kind of 2. extra-high voltage direct-current earthed switch according to claim 1, it is characterised in that the top of support insulator (3) Portion is provided with pressure-equalizing device, described pressure-equalizing device include junction be arranged on support insulator (3) top upper grading ring (8) and Lower uniform pressure ring (9)；Connecting plate (10) is arranged between grading ring (8) and lower uniform pressure ring (9).
- 3. a kind of extra-high voltage direct-current earthed switch according to claim 1, it is characterised in that support beam (4) uses groove Bracing members, support (5) use steel bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510345010.3A CN104979126B (en) | 2015-06-19 | 2015-06-19 | A kind of extra-high voltage direct-current earthed switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510345010.3A CN104979126B (en) | 2015-06-19 | 2015-06-19 | A kind of extra-high voltage direct-current earthed switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104979126A CN104979126A (en) | 2015-10-14 |
| CN104979126B true CN104979126B (en) | 2017-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510345010.3A Active CN104979126B (en) | 2015-06-19 | 2015-06-19 | A kind of extra-high voltage direct-current earthed switch |
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| Country | Link |
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| CN (1) | CN104979126B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711529B (en) * | 2018-08-06 | 2024-04-05 | 湖南长高高压开关有限公司 | Extra-high voltage + -1100 kv direct current folding arm telescopic horizontal type ground grounding switch |
| CN111091994B (en) * | 2019-11-11 | 2022-06-17 | 平高集团有限公司 | Movable end assembly of switch device and switch device |
| JP6877515B1 (en) * | 2019-11-27 | 2021-05-26 | 三菱電機株式会社 | Manufacturing method of grounding device, switchboard and grounding device |
| CN111525396B (en) * | 2020-05-26 | 2021-10-15 | 广东电网有限责任公司 | Power grid grounding system |
| CN111769507B (en) * | 2020-06-28 | 2024-09-10 | 长高电新科技股份公司 | Grounding device of high-voltage iron tower power transmission line and high-voltage iron tower cross arm |
| CN112750647B (en) * | 2020-12-11 | 2023-09-01 | 平高集团有限公司 | Grounding switch static contact and straight swing plug-in type grounding switch |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3526732A (en) * | 1967-10-09 | 1970-09-01 | Westinghouse Electric Corp | Electric switch structure |
| CN201048104Y (en) * | 2007-03-07 | 2008-04-16 | 湖南长高高压开关集团股份公司 | 1100kV extra-high voltage ground switch |
| CN104252990A (en) * | 2013-05-29 | 2014-12-31 | 国家电网公司 | A HVDC grounding switch and a stationary contact component thereof |
-
2015
- 2015-06-19 CN CN201510345010.3A patent/CN104979126B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3526732A (en) * | 1967-10-09 | 1970-09-01 | Westinghouse Electric Corp | Electric switch structure |
| CN201048104Y (en) * | 2007-03-07 | 2008-04-16 | 湖南长高高压开关集团股份公司 | 1100kV extra-high voltage ground switch |
| CN104252990A (en) * | 2013-05-29 | 2014-12-31 | 国家电网公司 | A HVDC grounding switch and a stationary contact component thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104979126A (en) | 2015-10-14 |
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