CN201274252Y - DC ultra-high-voltage isolation switch - Google Patents

DC ultra-high-voltage isolation switch Download PDF

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Publication number
CN201274252Y
CN201274252Y CNU2008201587747U CN200820158774U CN201274252Y CN 201274252 Y CN201274252 Y CN 201274252Y CN U2008201587747 U CNU2008201587747 U CN U2008201587747U CN 200820158774 U CN200820158774 U CN 200820158774U CN 201274252 Y CN201274252 Y CN 201274252Y
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CN
China
Prior art keywords
fingertip
contact
bearing
plate
direct current
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.)
Expired - Lifetime
Application number
CNU2008201587747U
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Chinese (zh)
Inventor
张婵玉
马晓
黄展先
邓文华
文伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Changgao High Voltage Switchgear Group Co Ltd
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Hunan Changgao High Voltage Switchgear Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hunan Changgao High Voltage Switchgear Group Co Ltd filed Critical Hunan Changgao High Voltage Switchgear Group Co Ltd
Priority to CNU2008201587747U priority Critical patent/CN201274252Y/en
Application granted granted Critical
Publication of CN201274252Y publication Critical patent/CN201274252Y/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses a DC super-voltage isolating switch which comprises two wire holder assemblies, a contact terminal side assembly, a contact finger side assembly, two support insulators, a mounting base and a driving and transmission mechanism. The lower ends of the two support insulators are fixed on a rotary bearing seat of the mounting base; the wire holder assemblies are respectively fixed on the top ends of the support insulators; the driving and transmission mechanism used for driving the support insulators to rotate is fixed on the mounting base; and the contact terminal side assembly and the contact finger side assembly are respectively arranged in the horizontal holes of the wire holder assemblies at the top ends of the two support insulators. The DC super-voltage isolating switch is simple and compact in structure, low in cost, high in insulation performance, strong in radio interference resistance, high in rated current parameter, and excellent in thermal stability and dynamic stable electric conductivity.

Description

Direct current superhigh pressure isolating switch
Technical field
The utility model is mainly concerned with field of electrical equipment, refers in particular to a kind of direct current superhigh pressure isolating switch.
Background technology
In high voltage power transmission and transformation technology, direct current transportation has that transmission distance is far away, transmission capacity is big, line loss is little, is easy to characteristics such as control and adjusting, be fit to the asynchronous interconnected of remote jumbo power delivery and regional power grid, aspect transmission power, for example 1,000,000 KW can be carried in a 500kV alternating current circuit, and ± 500 direct current transportation can reach 3,000,000 KW; Aspect fed distance, ± 500 can reach more than the 1000km, and ± 800 can reach more than the 2000km.The people that adopt the direct current back-to-back converter substation to be fit to adjacent electrical network go on foot interconnected.Need heavy current disconnecting switches during in view of the transmission line ice-melt in the freezing environment, and superheating phenomenon appears in direct current system direct current disconnecting link again and again at present, the heavy DC isolating switch has become market in urgent need, but this kind of switch at home, outer industry production field still is in blank out.
The utility model content
Problem to be solved in the utility model just is: at the technical problem that prior art exists, the utility model provide a kind of simple and compact for structure, with low cost, insulation property are high, anti-radio interference ability strong, rated current parameter height, thermal stability and the moving good direct current superhigh pressure isolating switch of electric conductivity of stablizing.
For solving the problems of the technologies described above, the solution that the utility model proposes is: a kind of direct current superhigh pressure isolating switch, it is characterized in that: it comprises two junction block assemblings, the assembling of contact side, the assembling of fingertip side, two post insulators, mounting seat and drive transmission device, the lower end of described two post insulators is fixed on the rotating shaft holder of mounting seat, the junction block assembling is individually fixed in the top of post insulator, be used for driving the drive transmission device that post insulator rotates and be fixed on the mounting seat, described contact side assembling and the assembling of fingertip side are oppositely arranged and are installed in respectively in the lateral aperture that two post insulator top junction blocks assemble.
Described contact side assembling comprises contact, contact aluminium conductive plate, contact joint, contact contact tube and contact guide vane end stop, described contact is half frame type structure and three sides that are fixed on contact aluminium conductive plate, the another one side of contact aluminium conductive plate is affixed by contact joint and contact contact tube, the contact contact tube is installed in the lateral aperture of post insulator top junction block assembling, and described contact guide vane end stop is installed on the bottom of contact aluminium conductive plate.
Described fingertip side assembling comprises the fingertip contact tube, the fingertip joint, fingertip aluminium conductive plate, main fingertip, the spacing plate that colludes, positive stop strip, guide plate is welded and the fingertip limiting plate, described two fingertip aluminium conductive plate one ends that are oppositely arranged are affixed by fingertip joint and fingertip contact tube, the fingertip contact tube is installed in the lateral aperture of post insulator top junction block assembling, two main fingertips are installed between two fingertip aluminium conductive plates and are individually fixed on the inner face of two fingertip aluminium conductive plates, the outer face of two fingertip aluminium conductive plates is welded with guide plate respectively and is used for linking to each other with the spacing plate that colludes that the contact guide vane end stop cooperates, positive stop strip is fixed on spacing bottom surface of colluding plate by adapter sleeve, and the fingertip limiting plate is fixed between two fingertip aluminium conductive plates.
Described spacing plate or the guide plate of colluding is equiped with alignment pin on being welded, and the outside of alignment pin is arranged with the fingertip spring, and an end of fingertip spring is pressed on the main fingertip by insulating case, and the other end is pressed on the shaft shoulder of alignment pin.
The upper/lower terminal of described contact contact tube is respectively equipped with a contact shading ring by the aluminium bent plate, and the upper/lower terminal of described fingertip contact tube is respectively equipped with a fingertip shading ring by the aluminium bent plate.
Described junction block assembling comprises al wiring seat, U-shaped fingertip, U-shaped fingertip spring, conductive shaft, insulating sleeve, tagblock and cover plate, offer vertical hole and lateral aperture on the described al wiring seat, conductive shaft is arranged in the vertical hole of al wiring seat, the upper end of conductive shaft fixedly contacts with tagblock, one end of described U-shaped fingertip is fixed on the al wiring seat, the other end contacts with conductive shaft is movable, and U-shaped fingertip spring housing is located on the dielectric pin.
Be equiped with the insulator shading ring between described post insulator and the al wiring seat.
Described rotating shaft holder is an all-sealed structure, and it comprises main shaft, bearing pedestal and bearing (ball) cover.The top of described inner hole of bearing seat is equipped with entad needle bearing, the bottom is equipped with bearing (ball) cover, entad needle bearing and needle roller thrust bearing are installed down in the described bearing (ball) cover, and main shaft passes through bearing pedestal and cooperates with last entad needle bearing, following entad needle bearing and needle roller thrust bearing formation.
Compared with prior art, advantage of the present utility model just is:
1, adopt the grading ring of aluminum material to form a perfect shielding harness in the utility model, increase the electric capacity of high-field electrode to body, capacitive earth current is compensated and improves voltage and distribute, thereby effectively improved the distribution of electric field, has the insulation property height, the strong advantage of anti-radio interference ability, its product experiment insulation parameter and anti-radio trepang number reach: 60min power-frequency withstand voltage 800kV, lightning impulse withstand voltage (effective value) 2680kV, switching impulse withstand voltage (effective value) 1860kV, anti-radio interference level≤500 μ V, its technical indicator is better than world level.
2, in the junction block of the present utility model assembling: fingertip is auto purification type " U-shaped " fingertip structure, is subjected to the inside electrodynamic repulsion force of self another side one side fingertip contacts with conductive shaft during energising, and fingertip is tightly clamped conductive shaft, has increased the reliability that flexible lamp contacts.Contact, fingertip assembling place: contact, fingertip all adopt thick copper coin to be shaped, the movable contact jaw of fingertip is from fixedly the contact jaw path is long simultaneously, increase conductive cross-sectional area guaranteeing that the switch fingertip does not produce under the prerequisite of plastic deformation like this, be well suited for heavy current disconnecting switches; After switch closes a floodgate and puts in place, the spacing just in time guide vane end stop wedge angle of centering contact assembling of plate hook that colludes of main fingertip assembling side, being subjected to external force effect such as binding post like this when the main switch cutter causes the contact fingertip to be engaged with when breaking away from tendency, the spacing plate that colludes can catch on guide vane end stop and prevents the charged separating brake fault of isolating switch, has increased the switch electric stability; Both sides aluminium conductive plate is separate with being connected of fingertip, makes to be electrically connected safe and reliablely herein, avoids occurring some switch and establish the whole connected mode of fixed block cause the generating heat situation of scaling loss switch between the fingertip of both sides; It is limited that contact is run into the spacing batten of main fingertip assembling side during combined floodgate, makes both sides contact, fingertip even contact, switch heating scaling loss when avoiding monolateral contact.Make product have the good thermally-stabilised and moving electric conductivity of stablizing from whole main switch cutter assembly structure, can carry bigger load current value, test shows that product can be by the temperature rise test examination of the big electric current of 5600A, and can bear the dynamic current value of 2 seconds heat-stable current 63kA and 170kA, its electric property is in the leading level in the world.
3, the utility model rotating shaft holder adopts entad needle bearing and the combined mode of needle roller thrust bearing, this compound mode compact conformation, two kinds of bearings are distinguished bearing radial force and axial force, stressed rationally, rigidity is high, strengthened the mechanical stability of switch widely;
4. contact fingertip of the present utility model adopts thick red copper silver-plated, and conduction partly adopts high-strength aluminum alloy pipe and Birmasil spare, and drive disk assembly has adopted hermetically sealed needle bearing, and switch has good corrosion resistance.
5, the utility model adopts the post insulator that isostatic pressing process is made, and enough insulation, mechanical strength and rigidity are arranged, and substantially exceeds the service condition requirement of product regulation.
Description of drawings
Fig. 1 is a general assembly structural representation of the present utility model;
Fig. 2 is the structural representation of the utility model shielding harness;
Fig. 3 is the plan structure schematic diagram of the utility model junction block assembling;
Fig. 4 is the sectional structure schematic diagram at A-A place among Fig. 3;
Fig. 5 is the plan structure schematic diagram of the utility model contact side assembling;
Fig. 6 is the side-looking structural representation of the utility model contact side assembling;
Fig. 7 is the side-looking structural representation of the utility model fingertip side assembling;
Fig. 8 is the sectional structure schematic diagram at B-B place among Fig. 7;
Fig. 9 is the utility model bearing pedestal assembled construction schematic diagram.
Marginal data
1, junction block assembling 2, the assembling of contact side
3, fingertip side assembling 4, post insulator
5, mounting seat 6, rotating shaft holder
7, drive transmission device 8, contact side insulator shading ring
9, contact side lower uniform pressure ring 10, contact side grading ring mounting panel
11, grading ring 12, fingertip side grading ring mounting panel on the contact side
13, grading ring 14, fingertip side lower uniform pressure ring on the fingertip side
15, fingertip side insulator shading ring 16, al wiring seat
17, U-shaped fingertip 18, fingertip spring
19, conductive shaft 20, insulating sleeve
21, tagblock 22, cover plate
23, contact 24, contact aluminium conductive plate
25, contact joint 26, contact contact tube
27, contact guide vane end stop 28, fingertip contact tube
29, fingertip joint 30, fingertip aluminium conductive plate
31, main fingertip 32, fingertip spring
33, alignment pin 34, insulating case
35, spacing plate 36, the positive stop strip of colluding
37, adapter sleeve 38, guide plate are welded
39, fingertip limiting plate 40, main shaft
41, dust ring 42, bearing pedestal
43, entad needle bearing 44, following needle bearing entad on
45, needle roller thrust bearing 46, sealing ring
47, bearing (ball) cover 48, vertical hole
49, lateral aperture
Embodiment
Below with reference to the drawings and specific embodiments the utility model is described in further details.
As shown in Figure 1, direct current superhigh pressure isolating switch of the present utility model, it comprises two junction block assemblings 1, contact side assembling 2, fingertip side assembling 3, two post insulators 4, mounting seat 5 and drive transmission device 7, the lower end of two post insulators 4 is fixed on the rotating shaft holder 6 of mounting seat 5, junction block assembling 1 is individually fixed in the top of post insulator 4, be used for driving the drive transmission device 7 that post insulator 4 rotates and be fixed on the mounting seat 5, assembling 2 of contact side and fingertip side assembling 3 are oppositely arranged and are installed in respectively in the lateral aperture 49 of two post insulators, 4 top junction blocks assemblings 1.The post insulator that post insulator 4 adopts isostatic pressing process to make.
As shown in Figure 5 and Figure 6, in the present embodiment, contact side assembling 2 comprises contact 23, contact aluminium conductive plate 24, contact joint 25, contact contact tube 26 and contact guide vane end stop 27, contact 23 is half frame type structure and three sides that are fixed on contact aluminium conductive plate 24, the another one side of contact aluminium conductive plate 24 is affixed by contact joint 25 and contact contact tube 26, contact contact tube 26 is installed in the lateral aperture of post insulator 4 top junction block assemblings 1, and contact guide vane end stop 27 is installed on the bottom of contact aluminium conductive plate 24.As shown in Figure 7 and Figure 8, in the present embodiment, fingertip side assembling 3 comprises fingertip contact tube 28, fingertip joint 29, fingertip aluminium conductive plate 30, main fingertip 31, the spacing plate 35 that colludes, positive stop strip 36, guide plate is welded 38 and fingertip limiting plate 39, two fingertip aluminium conductive plate 30 1 ends that are oppositely arranged are affixed by fingertip joint 29 and fingertip contact tube 28, fingertip contact tube 28 is installed in the lateral aperture of post insulator 4 top junction block assemblings 1, two main fingertips 31 are installed between two fingertip aluminium conductive plates 30 and are individually fixed on the inner face of two fingertip aluminium conductive plates 30, the outer face of two fingertip aluminium conductive plates 30 is welded 38 and be used for linking to each other with the spacing plate 35 that colludes that contact guide vane end stop 27 cooperates with guide plate respectively, positive stop strip 36 is fixed on spacing bottom surface of colluding plate 35 by adapter sleeve 37, and fingertip limiting plate 39 is fixed between two fingertip aluminium conductive plates 30.Spacing plate 35 or the guide plate of colluding is welded and is equiped with alignment pin 33 on 38, and the outside of alignment pin 33 is arranged with fingertip spring 32, and an end of fingertip spring 32 is pressed on the main fingertip 31 by insulating case 34, and the other end is pressed on the shaft shoulder of alignment pin 33.Referring to Fig. 2, the upper/lower terminal of contact contact tube 26 is respectively equipped with a contact shading ring 9 by aluminium bent plate 10, and the upper/lower terminal of fingertip contact tube 28 is respectively equipped with a fingertip shading ring 14 by aluminium bent plate 12.
As shown in Figure 3 and Figure 4, in the present embodiment, junction block assembling 1 comprises al wiring seat 16, U-shaped fingertip 17, U-shaped fingertip spring 18, conductive shaft 19, insulating sleeve 20, tagblock 21 and cover plate 22, offer vertical hole 48 and lateral aperture 49 on the al wiring seat 16, conductive shaft 19 is arranged in the vertical hole 48 of al wiring seat 16, the upper end of conductive shaft 19 fixedly contacts with tagblock 21, one end of U-shaped fingertip 17 is fixed on the al wiring seat 16, the other end and conductive shaft 19 movable contacts, U-shaped fingertip spring 18 is sheathed on the dielectric pin.Referring to Fig. 2, be equiped with insulator shading ring 8 and 15 between post insulator 4 and the al wiring seat 16, the last shading ring 11 of contact side, following shading ring 9 are installed in respectively on the contact side grading ring mounting panel 10 of fixedlying connected with contact tube; The last shading ring 13 of fingertip side, following shading ring 14 are installed in respectively on the fingertip side grading ring mounting panel 12 of fixedlying connected with contact tube.This contact side insulator shading ring 8 has been formed shielding harness of the present utility model with contact shading ring 9, fingertip shading ring 14, fingertip side insulator shading ring 15.
As shown in Figure 9, rotating shaft holder 6 is an all-sealed structure, and it comprises main shaft 40, bearing pedestal 42 and bearing (ball) cover 47.The top of bearing pedestal 42 endoporus is equipped with entad needle bearing 43, the bottom is equipped with bearing (ball) cover 47, entad needle bearing 44 and needle roller thrust bearing 45 are installed down in the bearing (ball) cover 47, and main shaft 40 passes through bearing pedestal 42 and cooperates with last entad needle bearing 43, following entad needle bearing 44 and needle roller thrust bearing 45 formation.With the outside position that contacts dust ring 41 is installed at bearing.
Operation principle: the handle of operating operator operating mechanism 7 clockwise, drive by the transmission device on the base 5 that left side post insulator 4 clockwise rotates, right side post insulator 4 rotates counterclockwise, thereby drive contact side assembling 2, fingertip side are assembled 3 locking phases to closing up, make contact insert between the fingertip and produce stable clamping force, thereby finish feed motion.The separating brake process in contrast.
The above only is a preferred implementation of the present utility model, and protection range of the present utility model also not only is confined to the foregoing description, and all technical schemes that belongs under the utility model thinking all belong to protection range of the present utility model.Should be pointed out that for those skilled in the art in the some improvements and modifications that do not break away under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.

Claims (9)

1, a kind of direct current superhigh pressure isolating switch, it is characterized in that: it comprises two junction block assemblings (1), contact side assembling (2), fingertip side assembling (3), two post insulators (4), mounting seat (5) and drive transmission device (7), the lower end of described two post insulators (4) is fixed on the rotating shaft holder (6) of mounting seat (5), junction block assembling (1) is individually fixed in the top of post insulator (4), be used for driving the drive transmission device (7) that post insulator (4) rotates and be fixed on the mounting seat (5), described contact side assembling (2) and fingertip side assembling (3) are oppositely arranged and are installed in respectively two post insulators (4) top junction block and assemble in the lateral aperture (49) of (1).
2, direct current superhigh pressure isolating switch according to claim 1, it is characterized in that: described contact side assembling (2) comprises contact (23), contact aluminium conductive plate (24), contact joint (25), contact contact tube (26) and contact guide vane end stop (27), described contact (23) is half frame type structure and three sides that are fixed on contact aluminium conductive plate (24), the another one side of contact aluminium conductive plate (24) is affixed by contact joint (25) and contact contact tube (26), contact contact tube (26) is installed in the lateral aperture of post insulator (4) top junction block assembling (1), and described contact guide vane end stop (27) is installed on the bottom of contact aluminium conductive plate (24).
3, direct current superhigh pressure isolating switch according to claim 2, it is characterized in that: described fingertip side assembling (3) comprises fingertip contact tube (28), fingertip joint (29), fingertip aluminium conductive plate (30), main fingertip (31), the spacing plate (35) that colludes, positive stop strip (36), guide plate is welded (38) and fingertip limiting plate (39), described two fingertip aluminium conductive plate (30) one ends that are oppositely arranged are affixed by fingertip joint (29) and fingertip contact tube (28), fingertip contact tube (28) is installed in the lateral aperture of post insulator (4) top junction block assembling (1), two main fingertips (31) are installed between two fingertip aluminium conductive plates (30) and are individually fixed on the inner face of two fingertip aluminium conductive plates (30), the outer face of two fingertip aluminium conductive plates (30) is welded with guide plate (38) respectively and is used for linking to each other with the spacing plate (35) that colludes that contact guide vane end stop (27) cooperates, positive stop strip (36) is fixed on spacing bottom surface of colluding plate (35) by adapter sleeve (37), and fingertip limiting plate (39) is fixed between two fingertip aluminium conductive plates (30).
4, direct current superhigh pressure isolating switch according to claim 3, it is characterized in that: described spacing plate (35) or the guide plate of colluding is welded and is equiped with alignment pin (33) on (38), the outside of alignment pin (33) is arranged with fingertip spring (32), one end of fingertip spring (32) is pressed on the main fingertip (31) by insulating case (34), and the other end is pressed on the shaft shoulder of alignment pin (33).
5, direct current superhigh pressure isolating switch according to claim 3, it is characterized in that: the upper/lower terminal of described contact contact tube (26) is respectively equipped with a contact shading ring (9) by aluminium bent plate (10), and the upper/lower terminal of described fingertip contact tube (28) is respectively equipped with a fingertip shading ring (14) by aluminium bent plate (12).
6, according to claim 1 or 2 or 3 or 4 or 5 described direct current superhigh pressure isolating switches, it is characterized in that: described junction block assembling (1) comprises al wiring seat (16), U-shaped fingertip (17), U-shaped fingertip spring (18), conductive shaft (19), insulating sleeve (20), tagblock (21) and cover plate (22), offer vertical hole (48) and lateral aperture (49) on the described al wiring seat (16), conductive shaft (19) is arranged in the vertical hole (48) of al wiring seat (16), the upper end of conductive shaft (19) fixedly contacts with tagblock (21), one end of described U-shaped fingertip (17) is fixed on the al wiring seat (16), the other end contacts with conductive shaft (19) is movable, and U-shaped fingertip spring (18) is sheathed on the dielectric pin.
7, direct current superhigh pressure isolating switch according to claim 6 is characterized in that: be equiped with the insulator shading ring between described post insulator (4) and the al wiring seat (16).
8, according to claim 1 or 2 or 3 or 4 or 5 described direct current superhigh pressure isolating switches, it is characterized in that: described rotating shaft holder (6) is an all-sealed structure, and it comprises main shaft (40), bearing pedestal (42) and bearing (ball) cover (47); The top of described bearing pedestal (42) endoporus is equipped with entad needle bearing (43), the bottom is equipped with bearing (ball) cover (47), entad needle bearing (44) and needle roller thrust bearing (45) are installed down in the described bearing (ball) cover (47), and main shaft (40) passes through bearing pedestal (42) and cooperates with last entad needle bearing (43), following entad needle bearing (44) and needle roller thrust bearing (45) formation.
9, direct current superhigh pressure isolating switch according to claim 6, it is characterized in that: described rotating shaft holder (6) is an all-sealed structure, and it comprises main shaft (40), bearing pedestal (42) and bearing (ball) cover (47); The top of described bearing pedestal (42) endoporus is equipped with entad needle bearing (43), the bottom is equipped with bearing (ball) cover (47), entad needle bearing (44) and needle roller thrust bearing (45) are installed down in the described bearing (ball) cover (47), and main shaft (40) passes through bearing pedestal (42) and cooperates with last entad needle bearing (43), following entad needle bearing (44) and needle roller thrust bearing (45) formation.
CNU2008201587747U 2008-10-15 2008-10-15 DC ultra-high-voltage isolation switch Expired - Lifetime CN201274252Y (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CNU2008201587747U CN201274252Y (en) 2008-10-15 2008-10-15 DC ultra-high-voltage isolation switch

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101916685A (en) * 2010-08-05 2010-12-15 湖南长高高压开关集团股份公司 1100kV ultra-high voltage isolating switch for opening and closing switching current of high-parameter bus
CN102931021A (en) * 2012-11-21 2013-02-13 正泰电气股份有限公司 Three-phase horizontal line-arrayed isolating switch with self-compacting earthing switch
CN105261514A (en) * 2015-11-17 2016-01-20 寇明军 Double-column double-arm inserting type disconnecting switch
CN114400161A (en) * 2022-02-25 2022-04-26 广东电网有限责任公司 Forced heat dissipation high-voltage isolating switch

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101916685A (en) * 2010-08-05 2010-12-15 湖南长高高压开关集团股份公司 1100kV ultra-high voltage isolating switch for opening and closing switching current of high-parameter bus
CN101916685B (en) * 2010-08-05 2013-01-09 湖南长高高压开关集团股份公司 1100kV ultra-high voltage isolating switch for opening and closing switching current of high-parameter bus
CN102931021A (en) * 2012-11-21 2013-02-13 正泰电气股份有限公司 Three-phase horizontal line-arrayed isolating switch with self-compacting earthing switch
CN105261514A (en) * 2015-11-17 2016-01-20 寇明军 Double-column double-arm inserting type disconnecting switch
CN114400161A (en) * 2022-02-25 2022-04-26 广东电网有限责任公司 Forced heat dissipation high-voltage isolating switch
CN114400161B (en) * 2022-02-25 2023-06-23 广东电网有限责任公司 Forced radiating high-voltage isolating switch

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Granted publication date: 20090715

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