CN103219190A - +/-1100kV high-voltage direct current disconnecting switch - Google Patents
+/-1100kV high-voltage direct current disconnecting switch Download PDFInfo
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- CN103219190A CN103219190A CN2013101219204A CN201310121920A CN103219190A CN 103219190 A CN103219190 A CN 103219190A CN 2013101219204 A CN2013101219204 A CN 2013101219204A CN 201310121920 A CN201310121920 A CN 201310121920A CN 103219190 A CN103219190 A CN 103219190A
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Abstract
The invention discloses a +/-1100kV high-voltage direct current disconnecting switch, which comprises two static side strut insulators with top parts being provided with static contacts, and a middle strut insulator arranged between the two static side strut insulators, wherein an operation insulator is arranged at a central position in the middle strut insulator; an electric conduction knife switch is arranged on an upper end of the operation insulator; and moving contacts matched with the static contacts are arranged on two ends of the electric conduction knife switch. The direct current disconnecting switch is of a three-column horizontal opening dual-fracture structure, and the electric conduction knife switch is arranged on the operation insulator, so that the electric conduction knife switch is rotated around a center of the middle strut insulator, and the aim that switching-on is formed when two ends of the electric conduction knife switch enter into the static contacts on upper parts of the struts on two ends, and switching-off is formed when the two ends of the electric conduction knife switch are separated from inner parts of the static contacts on the two ends and are rotated at a certain angle is realized. The high-voltage direct current disconnecting switch can meet the requirements on insulation capacity, flow capacity, bore terminal tensile force, standards of wireless interference, and usability.
Description
Technical field
The present invention relates to the high voltage isolator field, relate in particular to a kind of ± 1100kV high voltage direct current isolating switch.
Background technology
Development and national economy constantly increases electricity needs, transports to all parts of the country for high efficiency electric energy the abundant area of electric power resource, and State Grid Corporation of China proposes construction ± 1100kV high voltage direct current lines.Construction ± 1100kV high voltage direct current lines just must have ± 1100kV high voltage direct current isolating switch.
At present, electric pressure is the highest in the world accomplishes ± 800kV that ± 1100kV high voltage direct current isolating switch was not also produced in the world for the high voltage direct current isolating switch.Because the electric pressure height, the air insulation distance is big, and the external form of decision product is relatively large, conduction at isolating switch, the dynamic/static contact structure, the design of base and drive system, post insulator and operating mechanism select for use and square technology such as production and processing has many difficult problems to overcome.
Summary of the invention
The objective of the invention is to solve existing problem in the above-mentioned prior art, a kind of ± 1100kV high voltage direct current isolating switch is provided, this high voltage direct current isolating switch can satisfy ± and the 1100kV direct current transportation uses, and can satisfy insulation, through-current capability, bear terminal pulling force and radio and do instructions for use around critical technical parameter such as level and serviceability.
In order to solve the problems of the technologies described above, this present invention's technical scheme is: comprise that the top has two quiet lateral brace insulators of fixed contact, and be arranged on the intermediate studdle insulator between the two quiet lateral brace insulators; The inside center position of intermediate studdle insulator is provided with an operation insulator, and the upper end of operation insulator is equipped with the conduction plug-in strip; The two ends of conduction plug-in strip are provided with the moving contact that matches with fixed contact; Quiet lateral brace insulator is installed on the quiet wing base, and the intermediate studdle insulator is installed on the center base that has operating mechanism; The horizontal double break mouth structure of the common formation of conduction plug-in strip, fixed contact and moving contact.
Above-mentioned two quiet lateral brace insulators and intermediate studdle insulator are the combination post insulator, wherein, each combination post insulator is assembled into one by three posts that are distributed in an Atria summit independent post insulator and some triangle connecting frames respectively, and the top of post insulator is provided with the equal trim ring of leg-of-mutton insulator.
All be welded with the equal trim ring mounting panel of fixedlying connected on every limit of the equal trim ring of above-mentioned insulator with the triangle connecting frame at post insulator top.
Above-mentioned fixed contact comprises the contact base of fixedlying connected with quiet lateral brace insulator; The top of described contact base is equipped with the guide plate that makes correct deciliter of plug-in strip of conduction, and the top of guide plate is provided with the equal trim ring of fixed contact that is used to improve electric field, and the rear of guide plate is equipped with and is used for the binding post that is connected with bus; The installed inside of guide plate has static contact.
Above-mentioned conduction plug-in strip comprises conducting rod, and the middle part of conducting rod is provided with and makes whole conduction plug-in strip rotation and the rotation inverted box of overturning; The top of described rotation inverted box is provided with the equal trim ring of conduction plug-in strip that is used to improve rotation inverted box top electric field, and the below is provided with and is used to the bracing frame that supports whole conduction plug-in strip and link to each other with the operation insulator; The side, two ends of described conducting rod is provided with to match with static contact realizes conducting and the movable contact spring that separates; The end of conducting rod also is provided with the shielding ball that is used to improve conducting rod end electric field, and the shielding ball is installed in the end of conducting rod by mounting panel.
Above-mentioned conducting rod is the aluminium-alloy pipe of mid portion diameter greater than the two end portions diameter; Described moving contact is embedded in the end of conducting rod.
Above-mentioned bracing frame comprises upper flange, lower flange and three supporting brackets; Described upper flange is fixedlyed connected with the rotation inverted box, lower flange with operate insulator and fixedly connected, an end of three supporting brackets be fixed on upper and lower flange, between, the other end is fixedlyed connected with the intermediate studdle insulator.
Above-mentioned quiet wing base comprises and corresponding steel strut of quiet lateral brace insulator and the connecting plate that is connected steel strut; Fixedly connected with the bottom of quiet lateral brace insulator in the top of described steel strut.
The structure of above-mentioned center base is identical with quiet wing base, and middle also be provided with and operate the bearing pedestal that insulator links to each other; Operating mechanism is installed on the connecting plate of center base one side, and operating mechanism is connected with bearing pedestal by a linkage.
Aforementioned link mechanism comprises the vertical links that an end is fixedlyed connected with the operating mechanism output, and the waling stripe that links to each other with bearing pedestal of an end; The top of vertical links links to each other with an end that rotates connecting lever, rotates connecting lever and waling stripe and is hinged.
With respect to prior art, the present invention has following beneficial effect:
DC-isolation switch of the present invention is a kind of three post horizontally openable double break mouth structures, by at the center of intermediate studdle insulator setting operation insulator, and will conduct electricity plug-in strip be installed in the operation insulator on, make the conduction plug-in strip around the rotation of the center of intermediate studdle insulator, realized that entering into the fixed contact that is positioned at pillar top, two ends inner at conduction plug-in strip two ends is to close a floodgate, broken away from and rotate into certain Angle from two ends fixed contact inside to be separating brake; The present invention can satisfy the level and the serviceability of insulation, negotiability, the terminal pulling force that bears and the radio interference of high voltage direct current isolating switch fully.
Further, quiet lateral brace insulator of the present invention and intermediate studdle insulator are the combination post insulator, independently post insulator and some triangle connecting frames assemble by three posts, its low cost of manufacture, electrical insulation properties is good, especially mechanical performance is outstanding, and enough pulling force can be born in the top, and deformation takes place hardly; In addition, the equal trim ring on insulator top is designed to triangle, matches with the shape of post insulator, has both improved electric field effectively, has also saved space and raw material.
Further, the present invention is conducted electricity plug-in strip employing centre slightly, and the thin aluminium-alloy pipe in two ends welds together, and makes it more steady when rotated; Adopt the material of aluminium-alloy pipe simultaneously, alleviated the weight of conduction plug-in strip, increased the stability and the accuracy of whole device as conducting rod; In addition, the conducting rod two ends are provided with the shielding ball, in case conduction plug-in strip end when the separating brake position produces too high suspension voltage, the equal trim ring that is provided with above conducting rod has improved the electric field on rotation inverted box top, is that whole device is more stable when operation.
Further, the movable contact spring at conducting rod of the present invention two ends adopts mosaic technology to be embedded in the end of conducting rod, when guaranteeing that its cocurrent flow performance is good, has alleviated the weight of conducting rod end; In addition, conduction plug-in strip of the present invention is installed on the bracing frame, and is connected with the upper flange of bracing frame, and bracing frame is connected with the intermediate studdle insulator by three supporting brackets, and whole conduction plug-in strip is supported on the intermediate studdle insulator reliably.
Description of drawings
Fig. 1 is a front view of the present invention;
Fig. 2 is the internal organs view of "on" position of the present invention;
Fig. 3 is the internal organs view of gate-dividing state of the present invention;
Fig. 4 is the perspective view of intermediate studdle insulator of the present invention;
Fig. 5-1 is the front view of the quiet lateral brace insulator of the present invention; Equal trim ring;
Fig. 5-2 is the vertical view of the quiet lateral brace insulator of the present invention;
Fig. 6-1 is the structural representation of the equal trim ring of insulator of the present invention;
Fig. 6-2 is the vertical view of the equal trim ring of insulator of the present invention;
Fig. 7-1 is the front view of fixed contact of the present invention;
Fig. 7-2 is the end view of fixed contact of the present invention;
Fig. 8 conducts electricity the overall structure schematic diagram of plug-in strip for the present invention;
Fig. 9 conducts electricity the end view of plug-in strip for the present invention;
Figure 10-1 is the front view of bracing frame of the present invention;
Figure 10-2 is the vertical view of bracing frame of the present invention;
Figure 11 shields the structural representation of ball for the present invention;
Figure 12 is the structural representation of the quiet wing base of the present invention;
Figure 13 is the structural representation of center base of the present invention;
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Participate in Fig. 1, the present invention includes two quiet lateral brace insulators 4 that the top has fixed contact 1, and be arranged on the intermediate studdle insulator 3 between the two quiet lateral brace insulators; Shown in Fig. 5-1 and 5-2, two quiet lateral brace insulators 4 and intermediate studdle insulator 3 are the combination post insulator, wherein, each combination post insulator is assembled into one by three posts that are distributed in an Atria summit independent post insulator 41 and some triangle connecting frames 42 respectively, and the top of post insulator 41 is provided with the equal trim ring 7 of leg-of-mutton insulator, shown in Fig. 6-1 and 6-2, all be welded with the equal trim ring mounting panel 71 of fixedlying connected on every limit of the equal trim ring 7 of insulator with the triangle connecting frame 42 at post insulator 4 tops.As shown in Figure 4, the inside center position of intermediate studdle insulator 3 is provided with an operation insulator 31, and the upper end of operation insulator 31 is equipped with conduction plug-in strip 2; The two ends of conduction plug-in strip 2 are provided with the moving contact that matches with fixed contact 1; Quiet lateral brace insulator is installed on the quiet wing base 5, and as shown in figure 12, quiet wing base 5 comprises and quiet lateral brace insulator 4 corresponding steel struts 8 and the connecting plate 9 that is connected steel strut 8; Fixedly connected with the bottom of quiet lateral brace insulator 4 in the top of described steel strut 8; Intermediate studdle insulator 3 is installed on the center base 6 that has operating mechanism 62, and as shown in figure 13, the structure of center base 6 is identical with quiet wing base, and middle also be provided with and operate the bearing pedestal 61 that insulator links to each other; Operating mechanism 62 is installed on the connecting plate of center base 6 one sides, and operating mechanism 62 is connected with bearing pedestal 61 by a linkage, this linkage comprises the vertical links 63 that an end is fixedlyed connected with operating mechanism 62 outputs, and the waling stripe 64 that links to each other with bearing pedestal of an end; The top of vertical links 63 links to each other with an end of rotation connecting lever 65, rotate connecting lever 65 and be hinged with waling stripe 64, thereby the driving torque of operating mechanism output converts the rotation of the horizontal movement drive bearing pedestal of waling stripe to by the rotation connecting lever; The horizontal double break mouth structure of the common formation of conduction plug-in strip 2, fixed contact 1 and moving contact.
Shown in Fig. 7-1 and 7-2, above-mentioned fixed contact 1 comprises the contact base 11 of fixedlying connected with quiet lateral brace insulator; The top of described contact base 11 is equipped with the guide plate 12 that makes correct deciliter of plug-in strip of conduction, and the top of guide plate 12 is provided with the equal trim ring 13 of fixed contact that is used to improve electric field, and the rear of guide plate 12 is equipped with and is used for the binding post 14 that is connected with bus; The installed inside of guide plate 12 has static contact 15.
Shown in Fig. 8 and 9, conduction plug-in strip 2 comprises conducting rod 21, and the middle part of conducting rod 21 is provided with and makes whole conduction plug-in strip rotation and the rotation inverted box 22 of overturning, and conducting rod 21 is the aluminium-alloy pipe of mid portion diameter greater than the two end portions diameter; Described moving contact is embedded in the end of conducting rod 21.The top of described rotation inverted box 22 is provided with the equal trim ring 23 of conduction plug-in strip that is used to improve rotation inverted box top electric field, the below is provided with the bracing frame 24 that is used to support whole conduction plug-in strip and links to each other with operation insulator 31, shown in Figure 10-1 and 10-2, bracing frame 24 comprises upper flange 241, lower flange 242 and three supporting brackets 243; Described upper flange 241 is fixedlyed connected with the rotation inverted box, and lower flange 242 is fixedlyed connected with the operation insulator, and an end of three supporting brackets 243 is fixed between the upper and lower flange 241,242, and the other end is fixedlyed connected with intermediate studdle insulator 3; The side, two ends of described conducting rod 21 is provided with to match with static contact realizes conducting and the movable contact spring 25 that separates; The end of conducting rod 21 also is provided with the shielding ball 26 that is used to improve conducting rod end electric field, and as shown in figure 11, shielding ball 26 is installed in the end of conducting rod by mounting panel 261.
The course of work of the present invention is achieved in that
Isolating switch closes a floodgate: the output of operating mechanism is made clockwise and is rotated, drive the operation insulator by vertical links and waling stripe and also do the clockwise rotation, the operation insulator drives lower flange and the upper flange rotation in top and the bracing frame that it is connected, upper flange drives rotation inverted box and the rotation of conduction plug-in strip that is connected with it, when arriving state as shown in Figure 2, making process is finished, line conduction.
The isolating switch separating brake: the separating brake process is just in time opposite with making process, and the separating brake process is finished when the conduction plug-in strip moves to as shown in Figure 3 the position, and circuit disconnects.
The present invention kept apart with former high voltage ac/dc and compares, international at home electric pressure of ± 1100kV high voltage direct current isolating switch and correlation technique parameter are the highest, dielectric strength and product design maximum, the mechanical strength of bearing during operation is higher, so difficulty is bigger when designing and adding fabrication and processing.
Technical parameter of the present invention is as follows:
The present invention supports domestic power grid construction to develop to the more large and better direction of benefit of the higher transmission capacity of voltage, completely carries out useful innovation accumulation simultaneously in super-huge DC-isolation switch manufacturing side, promotes whole isolated switch industry technology and manufacture level and promotes.Simultaneously, ± 1100kV high voltage direct current isolating switch is that electric pressure is the highest in the world at present, the isolating switch of transmission capacity maximum, unique, this product characteristics is that the air insulation distance is bigger, and conducting rod is long especially, realizes that the difficulty of correct deciliter of isolating switch is bigger; Post insulator is high especially, and insulator easily was offset after certain pulling force was born in the end, the reliability that influence is used every cutter; Operation under ± 1120kV voltage, electric field is also bigger to the influence of environment, after employing design of the present invention, has solved the problems referred to above effectively, has satisfied user security and has used reliably.
Above content is that combination is specifically to further describing that the present invention did; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by claims of being submitted to.
Claims (10)
1. one kind ± 1100kV high voltage direct current isolating switch is characterized in that: comprise that the top has two quiet lateral brace insulators (4) of fixed contact (1), and be arranged on the intermediate studdle insulator (3) between the two quiet lateral brace insulators (4); The inside center position of intermediate studdle insulator (3) is provided with an operation insulator (31), and the upper end of operation insulator (31) is equipped with conduction plug-in strip (2); The two ends of conduction plug-in strip (2) are provided with the moving contact that matches with fixed contact (1); Quiet lateral brace insulator is installed on the quiet wing base (5), and intermediate studdle insulator (3) is installed on the center base (6) that has operating mechanism (62); The horizontal double break mouth structure of the common formation of conduction plug-in strip (2), fixed contact (1) and moving contact.
2. according to claim 1 ± 1100kV high voltage direct current isolating switch, it is characterized in that: described two quiet lateral brace insulators (4) and intermediate studdle insulator (3) are the combination post insulator, wherein, each combination post insulator is assembled into one by three posts that are distributed in an Atria summit independent post insulator (41) and some triangle connecting frames (42) respectively, and the top of post insulator (41) is provided with the equal trim ring of leg-of-mutton insulator (7).
3. according to claim 2 ± 1100kV high voltage direct current isolating switch, it is characterized in that: all be welded with the equal trim ring mounting panel (71) of fixedlying connected on every limit of the equal trim ring of described insulator (7) with the triangle connecting frame (42) at post insulator (4) top.
4. according to claim 1 ± 1100kV high voltage direct current isolating switch, it is characterized in that: described fixed contact (1) comprises the contact base (11) of fixedlying connected with quiet lateral brace insulator; The top of described contact base (11) is equipped with the guide plate (12) that makes correct deciliter of conduction plug-in strip, the top of guide plate (12) is provided with the equal trim ring of fixed contact (13) that is used to improve electric field, and the rear of guide plate (12) is equipped with and is used for the binding post (14) that is connected with bus; The installed inside of guide plate (12) has static contact (15).
5. according to claim 1 or 4 described ± 1100kV high voltage direct current isolating switch, it is characterized in that: described conduction plug-in strip (2) comprises conducting rod (21), and the middle part of conducting rod (21) is provided with and makes whole conduction plug-in strip rotation and the rotation inverted box (22) of overturning; The top of described rotation inverted box (22) is provided with the equal trim ring of conduction plug-in strip (23) that is used to improve rotation inverted box top electric field, and the below is provided with and is used to the bracing frame (24) that supports whole conduction plug-in strip and link to each other with operation insulator (31); The side, two ends of described conducting rod (21) is provided with to match with static contact realizes conducting and the movable contact spring that separates (25); The end of conducting rod (21) also is provided with the shielding ball (26) that is used to improve conducting rod end electric field, and shielding ball (26) is installed in the end of conducting rod by mounting panel (261).
6. according to claim 5 ± 1100kV high voltage direct current isolating switch, it is characterized in that: described conducting rod (21) is the aluminium-alloy pipe of mid portion diameter greater than the two end portions diameter; Described moving contact is embedded in the end of conducting rod (21).
7. according to claim 5 ± 1100kV high voltage direct current isolating switch, it is characterized in that: support frame as described above (24) comprises upper flange (241), lower flange (242) and three supporting brackets (243); Described upper flange (241) is fixedlyed connected with the rotation inverted box, lower flange (242) is fixedlyed connected with the operation insulator, one end of three supporting brackets (243) is fixed between the upper and lower flange (241,242), and the other end is fixedlyed connected with intermediate studdle insulator (3).
8. according to claim 1 ± 1100kV high voltage direct current isolating switch, it is characterized in that: described quiet wing base (5) comprises and corresponding steel strut of quiet lateral brace insulator (4) (8) and the connecting plate (9) that is connected steel strut (8); Fixedly connected with the bottom of quiet lateral brace insulator (4) in the top of described steel strut (8).
9. according to claim 1 ± 1100kV high voltage direct current isolating switch, it is characterized in that: the structure of described center base (6) is identical with quiet wing base, and middle also be provided with and operate the bearing pedestal (61) that insulator links to each other; Operating mechanism (62) is installed on the connecting plate of center base (6) one sides, and operating mechanism (62) is connected with bearing pedestal (61) by a linkage.
10. according to claim 9 ± 1100kV high voltage direct current isolating switch, it is characterized in that: described linkage comprises the vertical links (63) that an end is fixedlyed connected with operating mechanism (62) output, and the waling stripe (64) that links to each other with bearing pedestal of an end; The top of vertical links (63) links to each other with an end that rotates connecting lever (65), rotates connecting lever (65) and is hinged with waling stripe (64).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310121920.4A CN103219190B (en) | 2013-04-09 | 2013-04-09 | +/-1100kV high-voltage direct current disconnecting switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310121920.4A CN103219190B (en) | 2013-04-09 | 2013-04-09 | +/-1100kV high-voltage direct current disconnecting switch |
Publications (2)
| Publication Number | Publication Date |
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| CN103219190A true CN103219190A (en) | 2013-07-24 |
| CN103219190B CN103219190B (en) | 2015-04-22 |
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| CN201310121920.4A Active CN103219190B (en) | 2013-04-09 | 2013-04-09 | +/-1100kV high-voltage direct current disconnecting switch |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229207A (en) * | 2016-08-23 | 2016-12-14 | 国家电网公司 | Shield gold utensil and use the disconnecting switch of this shielding gold utensil |
| CN106783351A (en) * | 2017-02-24 | 2017-05-31 | 山东泰开隔离开关有限公司 | A kind of single armed is folded for insertion into formula ± 1100kV extra-high voltage direct-current disconnecting switch |
| CN109074972A (en) * | 2016-04-20 | 2018-12-21 | 通用电器技术有限公司 | HVDC disconnecting switch |
| CN109243906A (en) * | 2018-09-29 | 2019-01-18 | 湖南长高高压开关集团股份公司 | A kind of extreme high voltage combined direct-current isolating switch of right angle double-fracture, altogether static contact |
| CN109599290A (en) * | 2018-10-19 | 2019-04-09 | 中铁五局集团电务工程有限责任公司 | A kind of field railway high voltage isolator support device of recyclable recycling |
| CN112530730A (en) * | 2020-11-30 | 2021-03-19 | 海南电网有限责任公司东方供电局 | Distribution network overhead line isolating switch |
| CN114050083A (en) * | 2021-11-24 | 2022-02-15 | 镇江市丹高电器有限公司 | Electric control type single-pole double-head high-voltage isolating switch |
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| CN202564114U (en) * | 2012-03-23 | 2012-11-28 | 平高集团有限公司 | Bypass isolation switch for 1100kV extra-high voltage series compensation |
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| US4112268A (en) * | 1976-12-01 | 1978-09-05 | H. K. Porter Company, Inc. | Double side air break disconnecting switch |
| JPH1079216A (en) * | 1996-09-03 | 1998-03-24 | Takaoka Electric Mfg Co Ltd | Multiple disconnector |
| CN201060783Y (en) * | 2007-05-17 | 2008-05-14 | 西安西电高压开关有限责任公司 | Supervoltage AC 1100kV isolating switch |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109074972A (en) * | 2016-04-20 | 2018-12-21 | 通用电器技术有限公司 | HVDC disconnecting switch |
| CN109074972B (en) * | 2016-04-20 | 2019-12-27 | 通用电器技术有限公司 | HVDC disconnecting switch |
| CN106229207A (en) * | 2016-08-23 | 2016-12-14 | 国家电网公司 | Shield gold utensil and use the disconnecting switch of this shielding gold utensil |
| CN106229207B (en) * | 2016-08-23 | 2019-06-07 | 国家电网公司 | Shield fitting and the disconnecting switch using the shielding fitting |
| CN106783351A (en) * | 2017-02-24 | 2017-05-31 | 山东泰开隔离开关有限公司 | A kind of single armed is folded for insertion into formula ± 1100kV extra-high voltage direct-current disconnecting switch |
| CN106783351B (en) * | 2017-02-24 | 2019-03-05 | 国家电网公司 | A kind of single armed is folded for insertion into formula ± 1100kV extra-high voltage direct-current disconnecting switch |
| CN109243906A (en) * | 2018-09-29 | 2019-01-18 | 湖南长高高压开关集团股份公司 | A kind of extreme high voltage combined direct-current isolating switch of right angle double-fracture, altogether static contact |
| CN109243906B (en) * | 2018-09-29 | 2024-02-02 | 长高电新科技股份公司 | Extra-high voltage combined direct-current isolating switch with right-angle double-fracture and co-static contact |
| CN109599290A (en) * | 2018-10-19 | 2019-04-09 | 中铁五局集团电务工程有限责任公司 | A kind of field railway high voltage isolator support device of recyclable recycling |
| CN112530730A (en) * | 2020-11-30 | 2021-03-19 | 海南电网有限责任公司东方供电局 | Distribution network overhead line isolating switch |
| CN112530730B (en) * | 2020-11-30 | 2023-04-28 | 海南电网有限责任公司东方供电局 | Wire-distribution overhead line isolating switch |
| CN114050083A (en) * | 2021-11-24 | 2022-02-15 | 镇江市丹高电器有限公司 | Electric control type single-pole double-head high-voltage isolating switch |
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| CN103219190B (en) | 2015-04-22 |
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