CN112530730A - Distribution network overhead line isolating switch - Google Patents
Distribution network overhead line isolating switch Download PDFInfo
- Publication number
- CN112530730A CN112530730A CN202011368778.XA CN202011368778A CN112530730A CN 112530730 A CN112530730 A CN 112530730A CN 202011368778 A CN202011368778 A CN 202011368778A CN 112530730 A CN112530730 A CN 112530730A
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- contact
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- hemispherical shell
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- 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
- H01H31/023—Base and stationary contacts mounted thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/62—Heating or cooling of contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/64—Protective enclosures, baffle plates, or screens for contacts
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- 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
-
- 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
Landscapes
- Elimination Of Static Electricity (AREA)
Abstract
The invention discloses a distribution network overhead line isolating switch which comprises a first contact, a second contact and a switch blade, wherein the first contact and the second contact are respectively installed on an insulator, the switch blade is rotationally connected with the insulator, the switch blade can be rotationally contacted with or separated from the first contact and the second contact, the first contact and the second contact are respectively connected with a bus, a conductive spherical shell covering the first contact and the second contact is arranged in the insulator, the conductive spherical shell comprises a first hemispherical shell and a second hemispherical shell which are hinged on the insulator through a rotating shaft, the rotating shaft is provided with a gear, a rack is arranged between the gears of the first hemispherical shell and the second hemispherical shell, the rack is in sliding connection with the insulator, and the insulator is provided with a torsion spring for driving the first hemispherical shell and the second hemispherical shell to be opened mutually. The invention provides a distribution network overhead line isolating switch which protects a contact and solves the problem caused by overlarge current generated by lightning stroke to a certain extent.
Description
Technical Field
The invention relates to the technical field of isolating switches, in particular to an isolating switch for overhead lines of a distribution network.
Background
At present, the disconnecting switch of the overhead line of the distribution network is simple disconnecting switch structure equipment, the contact part of a disconnecting switch contact possibly generates heat, is affected by expansion and contraction and electric power, a contact screw is loosened, a moving port is not closed tightly, overheating or knife edge fusion welding is caused, flashover can occur in a seriously polluted area or under the condition of overvoltage, a porcelain bottle is exploded, the disconnecting switch equipment is damaged, and particularly after the disconnecting switch is struck by lightning, the lightning strikes enable strong current to flow through the contact, so that the problems are aggravated. The existing distribution network overhead line isolating switch still has a larger technical improvement space in the aspects of safety and reliability.
Disclosure of Invention
Aiming at the prior art, the invention provides a distribution network overhead line isolating switch which protects a contact and solves the problem caused by overlarge current generated by lightning stroke to a certain extent.
The technical scheme of the invention is realized as follows:
a distribution network overhead line isolating switch comprises a first contact, a second contact and a knife switch, wherein the first contact and the second contact are respectively arranged on an insulator, the knife switch is rotationally connected with the insulator, the knife switch can be rotationally contacted with or separated from the first contact and the second contact, the first contact and the second contact are respectively connected with a bus, a conductive spherical shell for coating the first contact and the second contact is arranged in the insulator, the conductive spherical shell comprises a first hemispherical shell and a second hemispherical shell, the first hemispherical shell is connected with the insulator, the second hemispherical shell is connected with the knife switch, the first hemispherical shell covers the second hemispherical shell along with the rotation of the knife switch, the bottom of the second hemispherical shell is provided with a drain hole, the first hemispherical shell is provided with a plurality of first inserting pieces, the second hemisphere shell is equipped with a plurality of second inserted sheets, first inserted sheet inserts between the second inserts.
The switch blade is connected with the insulator in a rotating mode, the switch blade can be further contacted with or separated from the first contact and the second contact in a rotating mode, the first hemispherical shell and the second hemispherical shell respectively comprise an inner shell and an outer shell, the outer shell is fixed on the inner shell through a connecting rod, the outer shell is provided with a plurality of first through holes, and the inner shell is provided with a second through hole.
Further, the inner shell is an insulating shell, the first through hole is an annular through hole, the first through hole divides the outer shell into a plurality of metal rings which are not in mutual contact, the first through hole is horizontally arranged, the metal rings above the first through hole are provided with metal protrusions, the metal protrusions are not in contact with the metal rings below the first through hole, the first through hole and the second through hole are staggered, and the second through hole is provided with a metal net.
Furthermore, the first through hole is aligned with the second through hole, and metal meshes are arranged on the first through hole and the second through hole.
Further, the metal mesh is located on the slide bar, the slide bar cup joints first water-swelling strip and second water-swelling strip, first water-swelling strip one end is fixed the middle part of slide bar, the other end with locate the metal mesh of shell is connected, second water-swelling strip one end is fixed the middle part of slide bar, the other end with locate the metal mesh of inner shell is connected.
Furthermore, the metal net is composed of a plurality of vertical metal wires, and the metal wires are provided with elastic villi which are perpendicular to the metal wires and face the outside of the conductive spherical shell.
Furthermore, the metal mesh comprises an inner metal mesh and an outer metal mesh, the elastic fluff is arranged on the outer metal mesh, and the elastic fluff is metal fluff.
Furthermore, the surface of the shell is provided with a plurality of projections made of hydrophilic materials.
The invention has the beneficial effects that: the first contact and the second contact are respectively arranged on the insulator, so that the insulation between the first contact and the second contact is ensured, the first contact and the second contact are respectively connected with the bus, the first contact is rotationally connected with the knife switch, the knife switch can be contacted with or separated from the second contact when rotating, and the circuit of the two buses is connected when the knife switch is contacted with the second contact. When the switch blade rotates to be in contact with the second contact, the second hemispherical shell is driven to cover the first hemispherical shell, so that the first hemispherical shell and the second hemispherical shell form a complete conductive spherical shell. When two buses are isolated, the switch blade is separated from the second contact, the first hemispherical shell is separated from the second hemispherical shell, and the opening angle of the first hemispherical shell and the second hemispherical shell is large, so that the first contact and the second contact can be maintained conveniently. The first inserting sheet and the second inserting sheet are mutually staggered and inserted to form a barrier to isolate part of insects and prevent the insects from entering. An airflow channel is formed between the first inserting sheet and the second inserting sheet, and heat dissipation of the first contact and the second contact is facilitated. The second inserted sheet and second inserted sheet form the groove of retaining in rainy weather, and the rainwater is filled between first inserted sheet and second inserted sheet, because the rainwater has electric conductivity, the rainwater fills the clearance between first hemisphere shell and the second hemisphere shell and makes the electrostatic shielding effect of electrically conductive spherical shell improve.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a distribution network overhead line disconnecting switch according to embodiment 1 of the present invention;
FIG. 2 is an enlarged view of area A in bitmap 1;
fig. 3 is a schematic structural diagram of a distribution network overhead line disconnecting switch according to embodiment 2 of the present invention;
FIG. 4 is a schematic view of the metal mesh structure of the present invention;
in the figure, 1 a first contact, 2 a second contact, 3 a knife switch, 4 insulators, 5 a conductive spherical shell, 6 a first hemispherical shell, 7 a second hemispherical shell, 8 a first inserting piece, 9 a second inserting piece, 10 an inner shell, 11 an outer shell, 12 a first through hole, 13 a second through hole, 14 connecting rods, 15 metal rings, 16 metal bulges, 17 metal meshes, 18 sliding rods, 19 a first water-swelling strip, 20 a second water-swelling strip, 21 elastic villi, 22 an inner metal mesh, 23 an outer metal mesh and 24 bulges.
Detailed Description
In order to better understand the technical content of the invention, specific embodiments are provided below, and the invention is further described with reference to the accompanying drawings.
Example 1
Referring to fig. 1-2, a distribution network overhead line disconnector comprises a first contact 1, a second contact 2 and a switch blade 3, wherein the first contact 1 and the second contact 2 are respectively mounted on an insulator 4, the switch blade 3 is rotatably connected with another insulator 4, the switch blade 3 is rotatably contacted with or separated from the first contact 1 and the second contact 2, the first contact 1 and the second contact 2 are respectively connected with a bus, a conductive spherical shell 5 covering the first contact 1 and the second contact 2 is arranged in the insulator 4, the conductive spherical shell 5 comprises a first hemispherical shell 6 and a second hemispherical shell 7, the first hemispherical shell 6 is connected with the insulator 4, the second hemispherical shell 7 is connected with the switch blade 3, the first hemispherical shell 6 covers the second hemispherical shell 7 along with the rotation of the switch blade 3, a drain hole (not marked) is arranged at the bottom of the second hemispherical shell 7, first hemisphere shell 6 is equipped with a plurality of first inserted sheets 8, second hemisphere shell 7 is equipped with a plurality of second inserted sheets 9, and first inserted sheet 7 and second inserted sheet 8 all are located the juncture of two hemisphere shells, first inserted sheet 8 inserts between the second inserts. The first contact 1 and the second contact 2 are respectively arranged on the insulator 4, so that the insulation between the first contact 1 and the second contact 2 is ensured, the first contact 1 and the second contact 2 are respectively connected with a bus, the knife switch 3 is rotatably connected with the insulator 4, the knife switch 3 can be rotatably contacted with or separated from the first contact 1 and the second contact 2, and when the knife switch 3 is contacted with the first contact 1 and the second contact 2, the circuit of the two buses is connected. When the switch blade 3 rotates to be in contact with the first contact 1 and the second contact 2, the second hemispherical shell 7 is driven to cover the first hemispherical shell 6, so that the first hemispherical shell 6 and the second hemispherical shell 7 form a complete conductive spherical shell 5, and as the conductive spherical shell 5 covers the first contact 1 and the second contact 2 to form a certain degree of electrostatic shielding effect, current flows through the surface of the conductive spherical shell 5 when lightning strike occurs, so that the first contact 1 and the second contact 2 are protected. When two buses are isolated, the switch blade 3 is separated from the second contact 2, the first hemispherical shell 6 is separated from the second hemispherical shell 7, and the opening angles of the first hemispherical shell 6 and the second hemispherical shell 7 are large, so that the first contact 1 and the second contact 2 can be maintained conveniently. The first inserting sheet 8 and the second inserting sheet 9 are inserted in a staggered mode to form a barrier, a part of insects are isolated, and the insects are prevented from entering the barrier. An air flow channel is formed between the first inserting sheet 8 and the second inserting sheet 9, and heat dissipation of the first contact 1 and the second contact 2 is facilitated. Second inserted sheet 9 and second inserted sheet 9 form the groove of retaining in rainy weather, and the rainwater is filled between first inserted sheet 8 and second inserted sheet 9, because the rainwater has electric conductivity, and the rainwater fills the clearance between first hemisphere shell 6 and the second hemisphere shell 7 makes the electrostatic shielding effect of electrically conductive spherical shell 5 improve.
Specifically, the first hemispherical shell 6 and the second hemispherical shell 7 both comprise an inner shell 10 and an outer shell 11, the outer shell 11 is fixed on the inner shell 10 through a connecting rod 14, the outer shell 11 is provided with a plurality of first through holes 12, and the inner shell 10 is provided with a second through hole 13. The first through hole 12 and the second through hole 13 can pass through air flow, and the heat dissipation effect of the contact is improved. The first through hole 12 is covered by rain water in the rain, and the covered housing 11 forms an electrostatic shield due to the conductivity of rain water, effectively protecting the contact in the event of a lightning strike.
Specifically, the inner shell 10 is an insulating shell, the first through hole 12 is an annular through hole, the first through hole 12 is used for dividing the outer shell 11 into a plurality of metal rings 15 which are not in mutual contact, the first through hole 12 is horizontally arranged, the metal ring 15 above the first through hole 12 is provided with a metal bulge 16, the metal bulge 16 is not in contact with the metal ring 15 below the first through hole 12, the first through hole 12 and the second through hole 13 are staggered, and the second through hole 13 is provided with a metal mesh 17. The second through hole 13 is an annular through hole and is parallel to the horizontal plane, and rainwater covers the second through hole 13 to form electrostatic shielding when raining. Because the conductivity of water is weaker than that of metal, the distance between the two metal rings 15 at the metal bulge 16 part is smaller than that at other parts, when lightning strike occurs, the metal bulge 16 forms a discharge electrode, current discharges from the metal bulge 16 to break through a through hole covered by rainwater, a discharge arc is formed, air in the conductive shell 11 is heated, the air expands to be sprayed out from the first through hole 12 and the second through hole 13, and the sprayed air blows to the electric arc to play an arc extinguishing role. Due to the heat absorption effect of the rainwater, part of heat generated during lightning stroke is absorbed, and therefore the influence of the lightning stroke on the contact is reduced. The first through hole 12 and the second through hole 13 are staggered, so that rainwater in rainy days can be prevented from being blown into the first contact 1 in the conductive shell 11 by wind. The metal mesh 17 can adsorb rainwater, promote the rainwater to cover the second through hole 13, improve the electrostatic shielding effect. When the rain does not appear, the metal mesh 17 can ventilate, so that the ventilation and heat dissipation effects are improved.
Example 2
Referring to fig. 3 to 4, the present embodiment is different from embodiment 1 in that the first through hole 12 is aligned with the second through hole 13, and the first through hole 12 and the second through hole 13 are both provided with a metal mesh 17. The first and second metal meshes 17 and 17 facilitate rainwater to cover the first and second through holes 12 and 13, and at the same time, an airflow path can be formed to promote heat dissipation of the first and second wiring contacts in the absence of rain.
Specifically, metal mesh 17 is located on slide bar 18, slide bar 18 has cup jointed first water-swelling strip 19 and second water-swelling strip 20, 19 one end of first water-swelling strip is fixed slide bar 18's middle part, the other end with locate the metal mesh 17 of shell 11 connects, 20 one end of second water-swelling strip is fixed slide bar 18's middle part, the other end with locate the metal mesh 17 of inner shell 10 connects. The expanded metal 17 can be slid along the slide bar 18 so that the expanded metal 17 can be detached from the outer case 11 or the inner case 10. The metal mesh 17 arranged on the inner shell 10 is connected with the sliding rod 18 through the second water-swelling strip 20, the second water-swelling strip 20 is reduced in sunny days, the metal mesh 17 is separated from the inner shell 10, the ventilation and heat dissipation effects are improved, when rainwater submerges the second water-swelling strip 20 in rainy days, the second water-swelling strip 20 expands to push the metal mesh 17 to slide to cover the second through hole 13 in the inner shell 10, the sealing effect is improved, the rainwater is promoted to cover the inner shell 10, the electrostatic shielding effect is improved, and the first contact 1 and the second contact 2 can be better protected in rainy days when lightning strikes. Similarly, the metal mesh 17 of locating the shell 11 is connected with slide bar 18 through first water-swelling strip 19, first water-swelling strip 19 reduces when fine, make metal mesh 17 and inner shell 10 separation, improve ventilation cooling effect, when the first water-swelling strip 19 of rainwater submergence when raining, first water-swelling strip 19 inflation promotion metal mesh 17 slides and covers first through-hole 12 on the shell 11, sealing effect has been improved, promote rainwater cover inner shell 10, electrostatic shielding's effect has been improved, the first contact 1 of protection and second contact 2 that can be better when the thunderbolt takes place in rainwater weather. The water-swellable tape can also be applied to example 1.
Specifically, the metal mesh 17 is composed of a plurality of vertical metal wires, and the metal wires are provided with elastic fluffs 21 which are perpendicular to the metal wires and face the outside of the conductive spherical shell 5. The vertical metal wires are beneficial to downward discharge of water, and under the action of the adsorption force of the water, rainwater is adhered to the metal wires and adsorbs two adjacent metal wires to form a water film to cover the through hole. The metal wire is provided with elastic villus, the villus is beneficial to adsorbing more water, and the villus can deform to contact with the metal wire under the action of the adsorption force of the water, so that the conduction effect is improved, and the electrostatic shielding effect is improved. The elastic fluff 21 absorbs some impurities to dissolve in the rainwater, and can improve the conductivity of the rainwater.
Specifically, the metal mesh 17 includes an inner metal mesh 22 and an outer metal mesh 23, the elastic pile 21 is disposed on the outer metal mesh 23, and the elastic pile 21 is a metal pile. The double-layer metal net 17 is beneficial to forming a thicker water film, the shielding effect is improved, and the elastic fluff 21 is metal fluff for improving the conductivity.
Specifically, the surface of the housing 11 is provided with a plurality of projections made of hydrophilic materials. And absorb rainwater, improve shielding effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A distribution network overhead line isolating switch is characterized by comprising a first contact, a second contact and a knife switch, wherein the first contact and the second contact are respectively installed on an insulator, the knife switch is rotatably connected with the other insulator, the knife switch can be rotatably contacted with or separated from the first contact and the second contact, the first contact and the second contact are respectively connected with a bus, a conductive spherical shell for covering the first contact and the second contact is arranged in the insulator, the conductive spherical shell comprises a first hemispherical shell and a second hemispherical shell, the first hemispherical shell is connected with the insulator, the second hemispherical shell is connected with the knife switch, the first hemispherical shell covers the second hemispherical shell along with the rotation of the knife switch, a drain hole is arranged at the bottom of the second hemispherical shell, the first hemispherical shell is provided with a plurality of first inserting pieces, the second hemispherical shell is provided with a plurality of second inserting pieces, the first inserting piece is inserted between the second inserting pieces.
2. The distribution network overhead line isolating switch as claimed in claim 1, wherein the first hemispherical shell and the second hemispherical shell each comprise an inner shell and an outer shell, the outer shell is fixed on the inner shell through a connecting rod, the outer shell is provided with a plurality of first through holes, and the inner shell is provided with a second through hole.
3. The distribution network overhead line isolating switch of claim 2, wherein the inner shell is an insulating shell, the first through hole is an annular through hole, the outer shell is divided into a plurality of metal rings which are not in contact with each other by the first through hole, the first through hole is horizontally arranged, the metal ring above the first through hole is provided with a metal protrusion, the metal protrusion is not in contact with the metal ring below the first through hole, the first through hole and the second through hole are staggered, and the second through hole is provided with a metal mesh.
4. The distribution network overhead line isolation switch of claim 2, wherein the first through hole is aligned with the second through hole, and the first through hole and the second through hole are provided with metal meshes.
5. The utility model provides a join in marriage net aerial conductor isolator of claim 4, characterized in that, the metal mesh is located on the slide bar, first water-swelling strip and second water-swelling strip have been cup jointed to the slide bar, first water-swelling strip one end is fixed the middle part of slide bar, the other end with locate the metal mesh of shell is connected, second water-swelling strip one end is fixed the middle part of slide bar, the other end with locate the metal mesh of inner shell is connected.
6. The disconnecting switch for the overhead lines of a distribution network according to claim 5, wherein the metal net is composed of a plurality of vertical metal wires, and the metal wires are provided with elastic fuzz which is perpendicular to the metal wires and faces the outside of the conductive spherical shell.
7. The distribution network overhead line isolating switch of claim 6, wherein the metal mesh comprises an inner metal mesh and an outer metal mesh, the elastic fluff is arranged on the outer metal mesh, and the elastic fluff is metal fluff.
8. The overhead line isolation switch of the distribution network of claim 1, wherein the surface of the housing is provided with a plurality of projections made of hydrophilic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011368778.XA CN112530730B (en) | 2020-11-30 | 2020-11-30 | Wire-distribution overhead line isolating switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011368778.XA CN112530730B (en) | 2020-11-30 | 2020-11-30 | Wire-distribution overhead line isolating switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112530730A true CN112530730A (en) | 2021-03-19 |
| CN112530730B CN112530730B (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011368778.XA Active CN112530730B (en) | 2020-11-30 | 2020-11-30 | Wire-distribution overhead line isolating switch |
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| CN (1) | CN112530730B (en) |
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| 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 |
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| CN109564832A (en) * | 2016-06-03 | 2019-04-02 | Abb瑞士股份有限公司 | Gas-insulating type low pressure or in break load switch |
| CN208848802U (en) * | 2018-08-30 | 2019-05-10 | 山西天安翔宇电器有限公司 | A kind of double-column horizontal open-type outdoor AC isolation switch |
| CN110146132A (en) * | 2019-06-18 | 2019-08-20 | 国网湖南省电力有限公司 | A kind of overhead transmission line channel environment parameter acquisition devices and its method |
| CN209461895U (en) * | 2019-04-22 | 2019-10-01 | 李亚迅 | A kind of shielding case connecing electricity for the built-in table of batch meter |
| CN210444692U (en) * | 2019-04-10 | 2020-05-01 | 友和利德(天津)科技有限公司 | Shielding shell for encoder |
| CN210897107U (en) * | 2020-01-08 | 2020-06-30 | 陕西科技大学 | Isolating switch for electric power |
| CN211377352U (en) * | 2019-12-25 | 2020-08-28 | 广东电网有限责任公司 | Insulating shielding tool for ten kilovolt outdoor cable isolation switch |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2606209A1 (en) * | 1986-11-03 | 1988-05-06 | Merlin Gerin | MULTIPOLAR ROTARY SWITCH WITH GAS ISOLATION |
| CA2316581A1 (en) * | 1999-08-27 | 2001-02-27 | David C. Funyak | Insulator for a lug assembly accessory of a circuit interrupter |
| CN102013831A (en) * | 2010-11-22 | 2011-04-13 | 李羲 | Electrostatic screen generator |
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| CN203983131U (en) * | 2014-07-18 | 2014-12-03 | 扬州华鼎电器有限公司 | A kind of solid insulation ring main unit three station rotary isolation switchs |
| CN105185642A (en) * | 2015-09-16 | 2015-12-23 | 上海天灵开关厂有限公司 | Directly-operated three-station disconnecting switch and gas-insulated switchgear |
| CN109564832A (en) * | 2016-06-03 | 2019-04-02 | Abb瑞士股份有限公司 | Gas-insulating type low pressure or in break load switch |
| CN206349646U (en) * | 2017-01-13 | 2017-07-21 | 北京兴达奇热工控制设备有限公司 | A kind of distribution isolating device |
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| 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 |
| CN207149447U (en) * | 2017-09-27 | 2018-03-27 | 青岛特锐德电气股份有限公司 | A kind of three-phase lightning protector with isolating device |
| CN208848802U (en) * | 2018-08-30 | 2019-05-10 | 山西天安翔宇电器有限公司 | A kind of double-column horizontal open-type outdoor AC isolation switch |
| CN210444692U (en) * | 2019-04-10 | 2020-05-01 | 友和利德(天津)科技有限公司 | Shielding shell for encoder |
| CN209461895U (en) * | 2019-04-22 | 2019-10-01 | 李亚迅 | A kind of shielding case connecing electricity for the built-in table of batch meter |
| CN110146132A (en) * | 2019-06-18 | 2019-08-20 | 国网湖南省电力有限公司 | A kind of overhead transmission line channel environment parameter acquisition devices and its method |
| CN211377352U (en) * | 2019-12-25 | 2020-08-28 | 广东电网有限责任公司 | Insulating shielding tool for ten kilovolt outdoor cable isolation switch |
| CN210897107U (en) * | 2020-01-08 | 2020-06-30 | 陕西科技大学 | Isolating switch for electric power |
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| CN112530730B (en) | 2023-04-28 |
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