CN214203544U

CN214203544U - Grounding switch device and switch cabinet

Info

Publication number: CN214203544U
Application number: CN202022644482.8U
Authority: CN
Inventors: 申河庆; 谢寅志; 王江涛; 陈轩; 张聚会; 王恩旭; 李昕莹; 肖瑞秀; 刘会远; 陶璟宸
Original assignee: State Grid Corp of China SGCC; Pinggao Group Co Ltd; Tianjin Pinggao Intelligent Electric Co Ltd
Current assignee: State Grid Corp of China SGCC; Pinggao Group Co Ltd; Tianjin Pinggao Intelligent Electric Co Ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-09-14
Anticipated expiration: 2030-11-16

Abstract

The utility model relates to an earthing switch device and cubical switchboard, earthing switch device includes: a post insulator; the static cutter head is fixedly arranged at the top end of the post insulator; the grounding knife is used for being jointed with and separated from the grounding connecting end of the static knife head; the shielding cover is covered outside the grounding connection end; the grounding connecting end is provided with a conductive lap joint part for fixing and conductively lapping an external outgoing line in the switch cabinet, so that the shielding cover is covered at the lap joint of the static cutter head and the external outgoing line; the conductive lap joint part is provided with a thread fastening structure so as to be detachably and fixedly connected with an external outgoing line. During the use, external lead-out wire and grounding switch all electrically conduct and connect in ground connection end department, make things convenient for the shield cover to cover the overlap joint of quiet tool bit and external lead-out wire, can cover the junction of quiet tool bit and grounding switch again, effectively reduce the influence of partial discharge that quiet tool bit caused, improved ground switch device performance, reduce the influence to peripheral insulating part, improved the security performance of cubical switchboard.

Description

Grounding switch device and switch cabinet

Technical Field

The utility model relates to an earthing switch device and cubical switchboard.

Background

With the increasingly wide application of the 35kV air insulation switch cabinet in the national distribution network system, the reliable operation of the switch cabinet is directly related to the power quality and the power supply reliability of the power system. Research shows that the most main destructive fault in high-voltage and medium-voltage equipment is an insulation fault, more than 80% of the insulation faults are caused by aging of an insulating part, and partial discharge exceeding is a main factor causing the aging of the insulating part.

In a 35kV air insulation switch cabinet product, because a static tool bit of a traditional grounding device is complex in structure and an electric field is not uniform, the partial discharge value is large, and the national standard requirement is difficult to meet; aiming at the problem, the main solution of the existing industry is to improve the static cutter head process of the grounding device. However, the static tool bit of the current grounding device is difficult to further improve on the premise of meeting the product performance of the 35k air-insulated switch cabinet, and meanwhile, the scheme has high processing cost and low efficiency, and a simple and effective general scheme cannot be formed.

In chinese utility model patent specification with an authorization bulletin number CN2664241Y, a small-sized earthing switch of a high-voltage switch cabinet is disclosed, a static contact and a static contact leading-out terminal are both fixed on an insulator, the static contact is used for cooperating with an earthing knife, a static contact cover is arranged corresponding to the static contact, an external electric field of the static contact can be improved by using the static contact cover, and the influence of partial discharge caused by the static contact is reduced. In the grounding switch, the outlet end of the static contact is used for being connected with the external leading-out wire in a lap joint mode so as to be in conductive connection with a corresponding electrical component of the switch cabinet, and the shielding cover in the grounding switch is not covered, so that the lap joint of the static contact and the external leading-out wire can also generate partial discharge influence.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a grounding switch device, which solves the technical problem that the overlap joint of the static contact and the external leading-out wire still has partial discharge influence because the shielding case only covers the matching part of the static contact and the grounding switch in the prior art; and simultaneously, the utility model also provides an use above-mentioned earthing switch device's cubical switchboard.

In order to achieve the above object, the present invention provides a ground switch device, comprising: an earthing switch device comprising:

a post insulator;

the static cutter head is fixedly arranged at the top end of the post insulator and is provided with a grounding connecting end;

the grounding knife is used for being jointed with and separated from the grounding connecting end so as to control the grounding switch to be switched on and off;

the shielding cover is covered outside the grounding connecting end of the static cutter head;

the grounding connecting end is provided with a conductive lap joint part for fixing and conductively lapping an external outgoing line in the switch cabinet, so that the shielding cover is covered at the lap joint of the static cutter head and the external outgoing line;

the conductive lap joint part is provided with a thread fastening structure so as to be detachably and fixedly connected with the external outgoing line.

The beneficial effects are that: the utility model provides an among the earthing switch device, the ground connection link sets up electrically conductive overlap joint portion, during the use, external lead-out wire and grounding switch all electrically conduct and connect in grounding connection department, make things convenient for the overlap joint department that the shield can cover quiet tool bit and external lead-out wire, can cover the junction of quiet tool bit and grounding switch again, the influence is put in the office that effectively reduces quiet tool bit and causes, earthing switch device performance has been improved, reduce the influence to peripheral insulating part, the security performance of the cubical switchboard that uses earthing switch device has been improved. And, set up the screw thread fastening structure on electrically conductive overlap joint portion, convenient and external lead-out wire detachable fixed assembly.

As a further improvement, the shielding cover is fixedly arranged at the top end of the post insulator.

The beneficial effects are that: the shield cover is convenient to fixedly mount, can be mounted in comparison with a static cutter head, and does not need to be additionally provided with a mounting position.

As a further improvement, the shielding cover is detachably and fixedly arranged at the top end of the post insulator.

The beneficial effects are that: the disassembly and replacement are convenient, and the external outgoing line and the static cutter head are connected in a lap-joint and conductive manner in a follow-up manner.

In a further improvement, the shielding cover and the static cutter head are provided with bolt mounting holes which are arranged in a penetrating way, so that the shielding cover and the static cutter head can be detachably and fixedly mounted at the top end of the post insulator through threaded fasteners which are arranged in the bolt mounting holes in a penetrating way.

The beneficial effects are that: the shielding cover and the static cutter head are fixed on the post insulator by using the threaded fastener, so that the structure is simple and the installation is convenient.

As a further improvement, the top end of the post insulator is provided with a threaded hole which is arranged to penetrate through the bolt mounting holes on the shielding case and the static tool bit, and the threaded fastener is a fastening bolt which is in threaded fastening connection with the threaded hole.

The beneficial effects are that: set up the screw hole on post insulator top, make things convenient for the screw fastening assembly.

As a further improvement, the shield case includes a case body portion and a fixing shank portion fixedly mounted on the top end of the post insulator.

The beneficial effects are that: the shielding cover is provided with the fixed handle part, so that the installation is convenient.

As a further improvement, the static cutter head is strip-shaped, one end of the static cutter head is the grounding connecting end, the other end of the static cutter head is a fixed supporting end, the fixed supporting end is fixedly connected with the top end of the post insulator so as to fixedly install the static cutter head on the post insulator, and the fixed supporting end and the fixed handle part are stacked and arranged.

The beneficial effects are that: the static cutter head is strip-shaped, so that the static cutter head and the shielding cover are conveniently stacked and fixed on the top end of the post insulator.

As a further improvement, the grounding connecting end and the fixed supporting end are arranged in a staggered manner in the extending direction of the post insulator; fixed stalk portion has the stiff end, and stiff end fixed mounting is in post insulator top, fixed stalk portion include the slope changeover portion, and the slope changeover portion transitional coupling is in so that stiff end and cover body part dislocation arrangement between stiff end and the cover body part, with the dislocation arrangement ground connection link and fixed stay end correspond.

The beneficial effects are that: the shielding cover and the static cutter head are arranged in a staggered mode, the shape and position consistency is improved, and the shielding protection effect is improved.

As a further improvement, the cover body part is of a cylindrical structure with a C-shaped cross section, and both ends of the cover body part in the axial direction of the cover body part are of an open structure.

The beneficial effects are that: the cover body part of the C-shaped tubular structure is convenient to buckle and cover on the static cutter head and is beneficial to ventilation and heat dissipation.

The utility model provides a technical scheme is of cubical switchboard: a switchgear cabinet comprising:

an electric element to be grounded having a ground terminal;

the grounding switch is electrically connected with the grounding terminal through an external outgoing line so as to ground the electric element;

the grounding switch includes:

a post insulator;

the grounding connecting end is provided with a conductive overlapping part so as to fixedly overlap the external outgoing line at the grounding connecting end, so that the shielding cover is covered at the overlapping part of the static cutter head and the external outgoing line;

the conductive lap joint part is provided with a thread fastening structure so as to be detachably and fixedly connected with an external outgoing line.

The beneficial effects are that: the utility model provides an among the cubical switchboard, electric elements's ground terminal is connected through the ground connection link electricity conduction of external lead-out wire and quiet tool bit, external lead-out wire and ground sword all electrically conductive connection are in ground connection link department, make things convenient for the shield cover to cover the overlap joint of quiet tool bit and external lead-out wire, can cover the junction of quiet tool bit and ground sword again, effectively reduce the influence is put in the office that quiet tool bit caused, the earthing switch device performance has been improved, reduce the influence to peripheral insulating part, the security performance of the cubical switchboard that uses earthing switch device has been improved. And, set up the screw thread fastening structure on electrically conductive overlap joint portion, convenient and external lead-out wire detachable fixed assembly.

Drawings

Fig. 1 is a schematic structural diagram of a grounding switch device provided by the present invention;

FIG. 2 is a right side schematic view of FIG. 1;

FIG. 3 is an exploded view of the shield and post insulator of FIG. 2;

FIG. 4 is a schematic diagram of the static tool tip of FIG. 3;

FIG. 5 is a schematic structural view of the shield of FIG. 3;

FIG. 6 is a schematic view of an assembly structure of an external lead wire and a grounding switch device when the grounding switch device shown in FIG. 1 is applied to a switch cabinet;

fig. 7 is a schematic structural view of fig. 4 without the shield case.

Description of reference numerals:

1-shielding case, 11-fixed end, 12-inclined transition section, 13-cover body part, 2-base, 3-static cutter head, 31-fixed support end, 32-dislocation connecting section, 33-conducting plate part, 34-connecting bulge, 35-bolt hole, 4-pillar insulator, 5-branch busbar, 6-fixing bolt, 7-fastening bolt, 8-grounding cutter shaft and 9-grounding cutter.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

The present invention will be described in further detail with reference to examples.

The utility model provides a specific embodiment 1 of earthing switch device:

the utility model provides an earthing switch device is used for installing in the gas insulated switchgear, consequently, needs to notice the influence is put in the office of quiet tool bit among the earthing switch device, to this problem, has disposed the shield cover specially, and this shield cover not only can cover the cooperation junction of quiet tool bit and earthing sword, can also cover the electrically conductive overlap joint department of external lead-out wire and quiet tool bit, so, the influence is put in the office that can effectual reduction quiet tool bit junction brought.

As shown in fig. 1 to 5, in this embodiment, the grounding switch device integrally includes a base 2, three post insulators 4 corresponding to three phases are sequentially arranged on the base 2 at intervals in the left-right direction, the top end of each post insulator 4 is detachably and fixedly connected to a static cutter head 3 and a shielding cover 1, a grounding cutter shaft 8 is arranged in front of the post insulator 4 on the base 2, and a grounding cutter 9 is mounted on the grounding cutter shaft 8 and used for engaging with and disengaging from the static cutter head 3 on the top end of the corresponding post insulator 4, so as to control the grounding switch device to be turned on and off.

In this embodiment, as shown in fig. 4, the static cutter head 3 is strip-shaped as a whole, one end of the static cutter head 3 is a fixed support end 31, and the fixed support end 31 is provided with a screw mounting hole for passing a fastening bolt 7 so as to fixedly mount the static cutter head 3 on the top end of the post insulator 4; the other end of the static cutter head 3 is a grounding connection end, the grounding connection end comprises a conductive plate part 33, and a connecting protrusion 34 is arranged on one side of the conductive plate part 33 facing the grounding cutter 9, and the connecting protrusion 34 is used for correspondingly engaging with and disengaging from the grounding cutter 9.

For the static blade 3, the conductive plate portion 33 is used as a conductive overlapping portion, four bolt holes 35 are formed in the conductive plate portion 33, the bolt holes are used as a thread fastening structure, and as shown in fig. 7, when the branch busbar 5 serving as an external lead wire in the switch cabinet is overlapped on the conductive plate portion 33, the fixing bolt 6 is penetrated, so that the branch busbar 5 and the conductive plate portion 33 can be overlapped and electrically connected.

The fixed support end 31 and the ground connection end of the stationary blade 3 are arranged offset in the up-down direction in which the post insulator 4 extends, so that the ground connection end is higher than the fixed support end 31. Specifically, the conductive plate portion 33 and the fixed support end 31 are transitionally connected by the offset connecting section 32.

Correspondingly, as shown in fig. 5, the shielding case 1 is also a bar structure as a whole, the shielding case 1 includes a fixed handle portion and a cover portion 13 as a whole, wherein the fixed handle portion has a fixed end 11, the fixed end 11 is stacked with the fixed supporting end 31 of the stationary tool bit 3, the fixed end 11 is also provided with a bolt mounting hole, and the bolt mounting hole is correspondingly communicated with the bolt mounting hole of the fixed supporting end 31 of the stationary tool bit 3 and the threaded hole at the top end of the post insulator 4, so as to wear the fastening bolt 7, and further fix the shielding case 1 and the stationary tool bit 3 together at the top end of the post insulator 4.

The cover body 13 is a cylindrical structure with a C-shaped cross section, so as to cover the grounding connection end of the static cutter head 3 conveniently, form shielding protection at the lap joint of the grounding connection end and the branch busbar 5, and form shielding protection at the joint of the connection protrusion 34 of the grounding connection end and the grounding cutter 9, thereby eliminating partial discharge influence generated by the static cutter head 3. Moreover, both ends of the cover body 13 in the axial direction are open structures, so that the ventilation and heat dissipation effects are improved.

In fact, the fixed handle further includes an inclined transition section 12 corresponding to the grounding connection end and the fixed support end 31 arranged in a staggered manner on the static cutter head 3, and the inclined transition section 12 is transitionally connected between the fixed end 11 and the cover body 13, so that the fixed end 11 and the cover body 13 are arranged in a staggered manner.

When the grounding switch device is used, the grounding switch device is installed in a switch cabinet, as shown in fig. 6 and 7, a branch busbar 5 connected to a grounding terminal of an electric element to be grounded in the switch cabinet is lapped with a current conducting plate of a static cutter head 3 and is fixed by a fixing bolt 6, the lapping conductive connection of the branch busbar 5 and the static cutter head 3 is ensured, for convenient assembly, a shielding cover 1 can be firstly detached, then the branch busbar 5 and the static cutter head 3 are fixedly connected, then the shielding cover 1 is fixedly installed at the top end of a post insulator 4, a cover body part 13 covers the lapping part of the static cutter head 3 and the branch busbar 5, meanwhile, a connecting bulge 34 covering the static cutter head 3 and a grounding cutter 9 joint are covered, good shielding protection is formed, further partial discharge influence generated by the static cutter head 3 is effectively eliminated, and partial discharge performance is met.

In the earthing switch device that this embodiment provided, because quiet tool bit itself is on the post insulator top with fixed mounting, when with shield cover fixed mounting on post insulator top, can directly assemble the shield cover with the help of the mounting structure of quiet tool bit, need not complicated processing technology, and simultaneously, female the ground connection end overlap joint conductive connection who arranges and quiet tool bit of branch as external lead-out wire, utilize the shielding effect of shield cover, the local that has effectively reduced quiet tool bit and the female overlap joint of branch and prevented too big problem, thereby make the local discharge value of the cubical switchboard of using above-mentioned earthing switch device satisfy the national standard requirement, it produces the property to promote, reduce the insulating accident probability of occurrence that arouses because of the local discharge value is too big.

The utility model provides a specific embodiment 2 of earthing switch device:

the difference from example 1 is mainly that: in embodiment 1, shield cover and quiet tool bit are all fixed on post insulator top through fastening bolt, conveniently dismantle the shield cover with the female arranging of installation branch. In this embodiment, the shield cover also can not detachable fixed mounting in advance on quiet tool bit, for example with shield cover welded connection on quiet tool bit, at this moment, but branch mother arranges the overlap joint on the side of the grounded knife of orientation of quiet tool bit, wear to adorn fixing bolt from bottom to top, during the assembly, usable instrument sends into fixation nut in the shield cover to cooperate with the fixing bolt that stretches out from bottom to top, in order to arrange branch with quiet tool bit fastening assembly together.

The utility model provides a specific embodiment 3 of earthing switch device:

the difference from example 1 is mainly that: in embodiment 1, the post insulator top sets up the screw hole to convenient and corresponding fastening bolt cooperation is fixed shield cover and quiet tool bit on the post insulator top. In this embodiment, a stud may be fixedly disposed at the top end of the post insulator in advance, and after the static cutter head and the shield cover are mounted on the stud in a penetrating manner, the lock nut is screwed.

The utility model provides a specific embodiment 4 of earthing switch device:

the difference from example 1 is mainly that: in example 1, the shield body portion of the shield case has a C-shaped cross section. In this embodiment, the cover body may be a sphere, which needs to retain a necessary gap to ensure the protrusion of the stationary blade, the introduction of the external lead wire, and the insertion of the grounding blade.

The utility model provides a specific embodiment 5 of earthing switch device:

the difference from example 1 is mainly that: in embodiment 1, the conductive bridging portion of the static cutter head comprises a conductive plate, and four bolt holes are formed in the conductive plate so as to fix and assemble the branch busbar and the conductive plate together through fixing bolts. In this embodiment, the connection stud is welded in advance on the conductive plate portion of the ground connection end of the stationary cutter head, the assembly hole is formed in the external lead-out wire, the assembly hole is inserted into the connection stud serving as the threaded fastening structure, and then the fixing nut is selectively installed.

The utility model provides an embodiment of cubical switchboard:

as shown in fig. 6 and 7, the switch cabinet in this embodiment includes a cabinet body, an electrical component is disposed in the cabinet body, the electrical component has a ground terminal for connecting a ground switch to control the electrical component to achieve grounding, the ground switch here may adopt the structure of the ground switch device in the above-mentioned switch device embodiment 1, which is not described herein again, and during assembly, the branch busbar 5 serving as an external outgoing line is fixedly connected between the ground terminal and the stationary blade 3.

During specific assembly, can dismantle shield cover 1 on the earthing switch device earlier, rethread fixing bolt 6 is arranged branch mother and is in the same place with quiet tool bit 3 fixed assembly, then fix shield cover 1 and quiet tool bit 3 together on the top of post insulator 4 through fastening bolt 7, so that shield cover 1 can cover quiet tool bit 3 and the female 5 overlap joints that arrange of branch, can cover the protruding and earthing knife 9's of connection of quiet tool bit 3 junction simultaneously, improve the partial discharge performance of quiet tool bit conductive connection department, optimize the earthing switch performance, reduce the damage of partial discharge to the insulating part, and the safety performance is improved.

Of course, in other embodiments, the grounding switch may also adopt the grounding switch device in any one of embodiments 2 to 5 of the grounding switch device, and will not be described herein again. In other embodiments, the external outgoing line can also adopt other commonly used lap cables, and the static cutter head is ensured to be conductively connected with the grounding terminal of the electric element to be grounded.

Finally, it should be noted that the above mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made without inventive effort to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An earthing switch device comprising:

a post insulator (4);

the static cutter head (3) is fixedly arranged at the top end of the post insulator (4) and is provided with a grounding connecting end;

the grounding knife (9) is used for being jointed with and separated from the grounding connecting end so as to control the grounding switch to be switched on and off;

the shielding cover (1) is covered outside the grounding connection end of the static cutter head;

the grounding connection end is provided with a conductive lap joint part for fixing and electrically lapping an external outgoing line in a switch cabinet, so that the shielding cover is covered at the lap joint of the static cutter head and the external outgoing line;

2. An earthing switch device according to claim 1, characterized in that said shielding cage (1) is fixedly mounted on top of said post insulator (4).

3. An earthing switch device according to claim 2, characterized in that said shielding cage (1) is removably fixedly mounted on top of said post insulator.

4. An earthing switch device according to claim 3, characterized in that bolt mounting holes are provided through the shield (1) and the stationary blade (3) for detachably and fixedly mounting the shield and the stationary blade on the top end of the post insulator by means of threaded fasteners inserted in the bolt mounting holes.

5. An earthing switch device according to claim 4, characterized in that the top end of the post insulator is provided with a threaded hole arranged to pass through bolt mounting holes in the shield and stationary blade, and the threaded fastener is a fastening bolt (6) which is in threaded fastening connection with the threaded hole.

6. An earthing switch device according to any one of claims 2-5, characterized in that the shielding cage comprises a cage body (13) and a fixing shank, which is fixedly mounted on top of the post insulator.

7. An earthing switch device according to claim 6, characterized in that said static cutter head (3) is bar-shaped, one end is said earthing connection end, the other end is a fixed support end (31), the fixed support end is fixedly connected with the top end of the post insulator to fixedly mount the static cutter head on the post insulator, said fixed support end is arranged in a superposed manner with said fixed handle.

8. An earthing switch device according to claim 7, characterized in that the earthing connection end and the fixed support end (31) are arranged offset in the post insulator extension direction; fixed stalk portion has stiff end (11), and stiff end fixed mounting is in post insulator (4) top, fixed stalk portion include slope changeover portion (12), and slope changeover portion transitional coupling is in between stiff end (11) and cover body portion (13) so that stiff end and cover body portion dislocation arrangement, with the dislocation arrangement ground connection end and fixed support end correspond.

9. The earthing switch device according to claim 6, characterized in that the cover body portion (13) is a cylindrical structure having a C-shaped cross-section, and both ends of the cover body portion in the axial direction thereof are open structures.

10. A switchgear, comprising:

an electric element to be grounded having a ground terminal;

the grounding switch is characterized in that the grounding switch device of any one of claims 1 to 9 is adopted as the grounding switch, and the external outgoing line is in conductive lap joint connection with the grounding connection end of the static cutter head of the grounding switch device through a corresponding conductive lap joint part.