CN117936314A

CN117936314A - Static contact device and grounding switch

Info

Publication number: CN117936314A
Application number: CN202211258036.0A
Authority: CN
Inventors: 肖伟建; 张周文
Original assignee: Xiamen Huadian Switchgear Co Ltd
Current assignee: Xiamen Huadian Switchgear Co Ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2024-04-26

Abstract

The invention provides a static contact device and a grounding switch, wherein the static contact device comprises: the fixed contact structure is provided with a contact part for being in contact fit with the moving contact; the conductor is coated on the outer side of the static contact structure, and is provided with an avoidance port corresponding to the contact position. According to the static contact device provided by the invention, the conductor is coated on the outer side of the static contact structure, and the conductor forms a more uniformly distributed electric field on the outer side of the static contact structure, so that the electric field of the whole device is more uniform, the insulativity is better, the dynamic stability and the thermal stability are better, and the static contact structure can meet the requirement of a 40.5kV high-voltage switch cabinet.

Description

Static contact device and grounding switch

Technical Field

The invention relates to the field of switches, in particular to a static contact device and a grounding switch.

Background

The 40.5kV high-voltage switch cabinet is widely applied in a transformer substation, and the grounding switch is used as one of core components of the transformer substation and is usually used during maintenance, so that personal safety of personnel is ensured, and meanwhile, the transformer substation has the function of protecting system safety when misoperation or short-circuit fault occurs.

The 40.5kV high-voltage switch cabinet has high requirements on the insulation performance, the dynamic stability and the thermal stability of the grounding switch, but the existing grounding switch has the problem that the electric field distribution of a high-voltage side contact is extremely uneven, and the insulation performance is poor.

Disclosure of Invention

The invention provides a static contact device and a grounding switch, and aims to solve the problem that an electric field of a static contact part of an existing grounding switch is not uniform.

In order to solve the technical problems, the invention adopts the following technical scheme:

the technical scheme of the invention provides a static contact device, which comprises:

The fixed contact structure is provided with a contact part for contact fit with the movable contact;

The conductor is coated on the outer side of the static contact structure, the conductor is provided with an avoidance port, and the avoidance port corresponds to the contact position.

According to one embodiment of the invention, the outer surface of the conductor is a plane and/or a cambered surface.

According to the technical scheme of the invention, the conductor is of a bending structure, a first side part, a second side part and a third side part are formed through bending, the first side part and the second side part are opposite in position and have a distance, the third side part is connected with the first side part and the second side part, so that a containing space is surrounded by the first side part, the second side part and the third side part, and the static contact structure is positioned in the containing space;

The avoidance port is positioned at the bending positions of the first side part and the third side part, and two ends of the avoidance port extend for a certain length along the first side part and the third side part respectively;

The extending length of the avoidance opening along the first side part is longer than that of the avoidance opening along the third side part.

According to one aspect of the present invention, the second side portion is provided with a first connection structure, and the fixed contact structure is connected to the first connection structure to be fixed on the conductor.

According to one aspect of the present invention, an end of the first side portion away from the third side portion protrudes a certain length relative to the second side portion, and an end of the first side portion away from the third side portion is provided with a second connection structure for fixing.

According to one technical scheme of the invention, the contact part comprises at least one pair of contact fingers, and the two contact fingers in the pair are opposite in position and are arranged at intervals;

The end part of each contact finger extends into the avoidance port, and each contact finger is contacted with or abutted against the inner side wall of the avoidance port.

According to one technical scheme of the invention, the avoidance port is of a closed annular structure.

In one aspect of the present invention, the conductor includes a metal piece;

The metal piece comprises a copper bar.

The invention also provides a grounding switch, comprising:

A bracket;

the movable contact is rotatably arranged on the bracket;

The static contact device according to any one of the preceding claims, wherein the moving contact can rotate relative to the static contact device and can contact or separate from the contact part of the static contact device through the escape opening of the static contact device.

According to one aspect of the invention, the conductor of the stationary contact apparatus is disposed on the bracket.

According to the static contact device provided by the invention, the conductor is coated on the outer side of the static contact structure, and the conductor forms a more uniformly distributed electric field on the outer side of the static contact structure, so that the electric field of the whole device is more uniform, the insulativity is better, the dynamic stability and the thermal stability are better, and the static contact structure can meet the requirement of a 40.5kV high-voltage switch cabinet.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic perspective view of a static contact device according to an embodiment of the present invention.

Fig. 2 is a schematic view of a part of the structure of fig. 1.

Fig. 3 is a schematic front view of a static contact device according to an embodiment of the present invention.

Fig. 4 is a schematic side view of a static contact device according to an embodiment of the present invention.

Fig. 5 is a schematic front view of a static contact structure according to an embodiment of the present invention.

Fig. 6 is a schematic perspective view of a static contact structure according to an embodiment of the present invention.

Fig. 7 is a schematic front view of a moving contact according to an embodiment of the present invention.

Fig. 8 is a schematic side view of a moving contact according to an embodiment of the present invention.

Fig. 9 is a schematic side view of the first phase of an embodiment of the present invention.

Fig. 10 is a schematic top view of a first phase of an embodiment of the present invention.

Fig. 11 is a schematic diagram of an assembled three-phase structure according to an embodiment of the present invention.

Fig. 12 is a partial schematic structure of fig. 11.

Fig. 13 is a schematic structural view of a grounding switch according to an embodiment of the present invention.

Fig. 14 is a schematic structural view of a grounding switch according to an embodiment of the present invention.

Fig. 15 is a schematic view of the spring assembly of an embodiment of the present invention.

Fig. 16 is a schematic diagram showing a structure of a closing position indication according to an embodiment of the present invention.

Fig. 17 is a schematic diagram of a structure of a brake-off position indication according to an embodiment of the present invention.

Fig. 18 is a schematic side view of a joint and joint indication mounting plate according to an embodiment of the present invention.

The reference numerals are explained as follows:

10. A grounding switch;

100. A stationary contact device; 110. a stationary contact structure; 1101. a contact portion; 111. a contact base; 1111. a contact finger; 1112. a connecting wall; 11121. a connection hole; 112. a connecting shaft; 113. an axial retainer ring; 114. a nut; 115. stacking springs; 116. a pin sleeve; 120. a conductor; 1201. an avoidance port; 1202. an inner sidewall; 121. a first side portion; 122. a second side portion; 123. a third side portion; 124. an accommodating space; 125. a second connection structure; 126. a plane; 127. a cambered surface; 128. pre-breakdown location;

201. A bracket; 202. operating the main shaft; 203. a left mounting underframe; 204. a right mounting underframe; 205. a confluence copper pipe; 206. a position indication device; 2061. a closing instruction; 2062. a brake-separating indication; 2063. fixing the bending plate; 2064. a mounting plate; 207. grounding soft braided copper wires; 208. a double-ended screw; 209. a shaft sleeve; 210. a limit cam; 211. a limiting shaft sleeve; 212. driving a dial; 213. spring assembly; 2131. a cotter pin; 2132. a positioning pin; 2133. shifting fork; 2134. waist roller sleeve; 2135. a large spring; 2136. a small spring; 2137. a guide shaft; 2138. a spring seat; 214. a sensor;

300. a moving contact; 310. a contact shaft sleeve; 320. a movable crank arm; 330. a contact piece; 340. and an elastic pin.

Detailed Description

While this invention is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to that as illustrated.

Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the invention, not to imply that each embodiment of the invention must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

In the embodiment shown in the drawings, indications of orientation (such as up, down, in, out, left, right, front, back, etc.) are used to explain the structure and movement of the various components of the invention are not absolute but relative. These descriptions are appropriate when the components are in the positions shown in the drawings. If the description of the location of these components changes, then the indication of these directions changes accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.

Preferred embodiments of the present invention will be further elaborated below with reference to the drawings of the present specification.

As shown in fig. 1 and 2, the present invention proposes a stationary contact apparatus 100, including: a stationary contact structure 110 and a conductor 120.

The fixed contact structure 110 is provided with a contact portion 1101 for contact fit with the moving contact 300, the conductor 120 is coated on the outer side of the fixed contact structure 110, the conductor 120 is provided with an escape opening 1201, and the escape opening 1201 corresponds to the contact portion 1101 in position, so that the moving contact 300 can pass through the escape opening 1201 to be in contact fit with the fixed contact structure 110.

According to the static contact device 100 provided by the invention, the conductor 120 is coated on the outer side of the static contact structure 110, and the conductor 120 forms a more uniform electric field on the outer side of the static contact structure 110, so that the electric field of the whole device is more balanced, the insulativity is better, the dynamic stability and the thermal stability are better, and the static contact structure 110 can meet the requirement of a 40.5kV high-voltage switch cabinet.

It should be noted that, as shown in fig. 3, the conductor 120 in this embodiment wraps the outer side of the fixed contact structure 110, and the conductor 120 completely wraps the fixed contact structure 110, but means that the fixed contact structure 110 is blocked by the conductor 120 at least at one side facing the moving contact 300, instead of the inner surface of the conductor 120 being completely attached to the outer surface of the fixed contact structure 110.

In certain embodiments, the outer surface of the conductor 120 is a planar surface 126 and/or an arcuate surface 127. In more detail, as shown in fig. 2, the conductor 120 is of a unitary structure, and the outer surface of the conductor 120 has a plurality of flat surfaces 126, and the adjacent flat surfaces 126 are smoothly transitioned by an arc surface 127. Thus, the electric field distribution of the conductor 120 is more uniform, the risk of tip discharge is reduced, and the insulating performance of the product is greatly improved.

In some embodiments, the conductor 120 is of a bent structure, and is bent to form a first side 121, a second side 122 and a third side 123, the first side 121 and the second side 122 are opposite in position and have a distance, the third side 123 is connected with the first side 121 and the second side 122, so that the first side 121, the second side 122 and the third side 123 enclose a containing space 124, the static contact structure 110 is located in the containing space 124, and therefore, while ensuring the coating effect of the conductor 120 on the static contact structure 110, the processing technology of the conductor 120 is simpler, the containing space 124 is three-sided open, and assembly between the static contact structure 110 and the conductor 120 is facilitated.

The avoidance opening 1201 is located at the bending positions of the first side portion 121 and the third side portion 123, so as shown in fig. 14, the moving contact 300 moves towards the position where the avoidance opening 1201 is located to be in contact with the fixed contact structure 110, the bending positions of the first side portion 121 and the third side portion 123 are the smallest in opening distance of the moving contact 300, and in the closing process, the pre-breakdown position 128 of the electric arc is located at the bending positions of the first side portion 121 and the third side portion 123, so that the influence on the fixed contact structure 110 is small, and closing is facilitated.

The two ends of the avoidance opening 1201 extend along the first side portion 121 and the third side portion 123 respectively for a certain length, so that the avoidance opening 1201 has a larger arrangement space, and the moving contact 300 can more conveniently pass through the avoidance opening 1201 to contact with the static contact structure 110.

Further, the extending length of the avoidance opening 1201 along the first side portion 121 is greater than the extending length of the avoidance opening 1201 along the third side portion 123, so that on one hand, the first side portion 121 has a larger arrangement space than the third side portion 123, and is also beneficial to shortening the length of the third side portion 123, thereby enabling the whole conductor 120 to be miniaturized, and on the other hand, with reference to fig. 12 and 13, the extending length of the avoidance opening 1201 along the first side portion 121 is greater, thereby facilitating the moving contact 300 to be inserted deeper into the conductor 120, and further enabling the moving contact 300 to be fully contacted with the static contact structure 110.

In some embodiments, the second side 122 is provided with a first connection structure, and the stationary contact structure 110 is connected to the first connection structure to be fixed on the conductor 120. Thus, the conductor 120 and the static contact structure 110 are split components, the conductor 120 has replaceability, and after the conductor 120 is deformed and burnt, a new conductor 120 can be replaced, so that the maintenance is more convenient.

For example, the first connection structure is a through hole, and the fastener passes through the through hole and is locked on the fixed contact structure 110, so that the connection between the conductor 120 and the fixed contact structure 110 is realized, and the structure is simple and the connection is convenient.

Of course, other structural forms, such as a buckle, a slot, etc., may be adopted for the first connection structure, which are not listed herein, and the first connection structure may be omitted, and the conductor 120 and the fixed contact structure 110 may be formed into an integral structure by welding, etc., so that the connection between the two structures is more firm and not easy to be released by force.

In some embodiments, an end of the first side portion 121 remote from the third side portion 123 protrudes a certain length relative to the second side portion 122, and an end of the first side portion 121 remote from the third side portion 123 is provided with a second connection structure 125 for fixing. The first side part 121 is arranged to protrude out of the second side part 122 by a certain length, and the second connecting structure 125 is arranged at one end far away from the third side part 123, so that the fixed contact device 100 is installed and fixed, and meanwhile, the opening distance between the fixed contact structure 110 and the moving contact 300 is reduced, when the short-circuit current is closed, the arc generating time is shorter, the conductor 120 is not easy to burn, the requirement on the spring assembly 213 is reduced, and the closing reliability of the moving contact 300 is ensured.

In some embodiments, as shown in fig. 4, 5 and 6, the contact portion 1101 includes at least one pair of contact fingers 1111, where two contact fingers 1111 in a pair are disposed opposite to each other and spaced apart from each other, an end portion of each contact finger 1111 extends into the avoidance opening 1201, and each contact finger 1111 contacts or abuts against an inner sidewall 1202 of the avoidance opening 1201, so that the contact finger 1111 is laterally limited by the conductor 120, which is beneficial to strengthening a clamping force of the contact finger 1111 on the moving contact 300, and cannot be sprung out when an electric repulsive force is generated when a large-capacity current flows.

Furthermore, the avoidance opening 1201 is a closed annular structure, the avoidance opening 1201 of the closed annular structure further increases the clamping force of the conductor 120 on the contact finger 1111, and the closed annular structure is more stable, which is beneficial to reducing the risk of stress deformation of the conductor 120.

In some embodiments, the conductor 120 comprises a metallic member such that the electric field generated by the conductor 120 is more uniformly distributed.

For example, the metal piece comprises a copper bar, and the copper bar has the advantages of convenience in material acquisition, low cost and easiness in processing.

The present invention also provides a grounding switch 10 comprising: the support 201, the moving contact 300 and the stationary contact apparatus 100 according to any of the foregoing embodiments.

The moving contact 300 is rotatably disposed on the support 201, and the moving contact 300 can rotate relative to the fixed contact device 100 and can contact with or separate from the contact portion 1101 of the fixed contact device 100 through the escape opening 1201 of the fixed contact device 100.

Further, the conductor 120 of the stationary contact apparatus 100 is disposed on the bracket 201. Thus, the static contact device 100 is integrated on the support 201, so that the integrity is better, and the assembly is convenient.

Of course, in other embodiments, a split type structure scheme may be adopted for the stationary contact apparatus 100 and the moving contact 300.

One embodiment is

This embodiment provides a grounding switch 10 that can be applied to 40.5kV cabinets. The grounding switch 10 includes a fixed contact device 100 and a movable contact 300.

As shown in fig. 1 to 6, the static contact device 100 includes a static contact structure 110 and a U-shaped copper bar, and the static contact structure 110 is installed in the U-shaped copper bar in a cladding manner, so that the electric field of the whole high-voltage static contact device 100 is balanced, and insulation is facilitated.

In more detail, regarding the static contact structure 110, the static contact structure 110 includes two opposite L-shaped contact seats 111 disposed at intervals, one end of each contact seat 111 is formed with a contact finger 1111, the other end is formed with a connecting wall 1112, the connecting wall 1112 is provided with a connecting hole 11121 for connecting with a U-shaped copper bar, the connecting shaft 112 passes through the two contact seats 111, and the connecting shaft 112 passes through the axial retainer ring 113, the stack spring 115, the L-shaped contact seat 111, and the pin bush 116 in sequence and then is held tightly by the nut 114.

As shown in fig. 7 and 8, the movable contact 300 includes a movable crank arm 320, a contact piece 330 and an elastic pin 340, and the movable crank arm 320 is fixed by the elastic pin 340 after assembling the contact piece 330 and the contact sleeve 310.

The grounding switch 10 further includes an operating main shaft 202, a left mounting chassis 203, a right mounting chassis 204, a bus copper pipe 205, a position indicating device 206, a ground soft braid copper wire 207, a double-ended screw 208, a shaft sleeve, a limit cam 210, a limit shaft sleeve 211, a drive dial 212, a spring assembly 213, and a sensor 214.

As shown in fig. 9, 10 and 11, the operation main shaft 202 passes through the left mounting chassis 203, the shaft sleeve 209, the driving dial 212, the moving contact 300 and the right mounting chassis 204 in turn from left to right, passes through the left mounting chassis 203, the right mounting chassis 204, the front waist roller sleeve 2134 and the rear limit shaft sleeve 211 by bolts, is locked by locknuts, and then locks the position of the operation main shaft 202 by the limit cam 210, thereby completing the installation of the first chassis, and completing the assembly of the second and third chassis according to the requirement of the space dimension.

The double-headed screw 208 sequentially passes through the moving contact 300 and the bus copper pipe 205 in advance, and the left and right moving contacts 300 are fixedly covered by locknuts after being sheathed with the terminals of the grounded soft braided copper wire 207 corresponding to the double-headed screw 208.

As shown in fig. 15, the spring assembly 213 includes a split pin 2131, a positioning pin 2132, a fork 2133, a lumbar roller sleeve 2134, a large spring 2135, a small spring 2136, a guide shaft 2137, and a spring seat 2138, wherein after the positioning pin 2132 passes through the fork 2133 and the movable crank arm 320 in sequence, the positioning pin 2131 is used for limiting and fixing, and after the guide shaft 2137 passes through the spring seat 2138, the large spring 2135 and the small spring 2136 are pressed onto the lumbar roller sleeve 2134 by a fixture, and the second group and the third group of spring assemblies 213 are completed in sequence.

As shown in fig. 16, 17 and 18, the closing instruction 2061 and the opening instruction 2062 are attached to the mounting plate 2064 in advance, and are fixed to the required position of the operation main shaft 202 by the locking method using the fixing bent plate 2063.

The sensor 214 is fixed by the underframe of the preassembled grounding switch 10 through a standard component, and the U-shaped copper bar is connected with the sensor 214 to complete the whole machine assembly.

The grounding switch 10 is switched on: according to the installation form (left operation or right operation) of the operation main shaft 202, when the grounding switch 10 is at the opening position, the operation main shaft 202 is rotated clockwise or anticlockwise to drive the driving plate 212 to rotate, so that the positioning pin 2132 is driven to compress the large and small springs 2136 towards the direction of the guide shaft 2137 and rotate the spring assembly 213; when the positioning pin 2132 rotates to be in line with the centers of the operating main shaft 202 and the lumbar roller sleeve 2134, namely a dead point position, the acting force of the spring is maximum, and when the dead point position is over, the spring rapidly pushes the positioning pin 2132 to rotate towards the closing direction of the grounding switch 10; when the moving contact 300 is closed in place, the contact finger 1111 is forced by the peripheral overlying spring 115 with its own rigidity, so that the contact reliability of the contact and the contact finger 1111 is ensured.

The grounding switch 10 is opened: according to the installation form (left operation or right operation) of the operation main shaft 202, when the grounding switch 10 is in a closing position, the operation main shaft 202 is rotated anticlockwise or clockwise, and after overcoming the clamping force of a contact and a contact finger 1111, the driving dial 212 is driven to rotate, so that the positioning pin 2132 compresses a large spring 2136 and a small spring 2136 towards the direction of the guide shaft 2137 and rotates a spring assembly 213; when the positioning pin 2132 rotates to be in line with the centers of the operating main shaft 202 and the lumbar roller sleeve 2134, namely, a dead point position, the acting force of the spring is maximum, and when the dead point position is exceeded, the spring rapidly pushes the positioning pin 2132 to rotate towards the opening direction of the grounding switch 10 until the opening is in place.

The embodiment has at least the following advantages:

1. The electric field distribution is more balanced through the U-shaped copper bars;

2. The 1101-bit contact part of the contact and the contact finger 1111 is opposite to the slot of the U-shaped copper bar and is transversely limited, and the contact finger 1111 cannot be sprung when electric repulsive force is generated by high-capacity current flowing through the contact;

3. In the closing process of the ground knife, arc pre-breakdown occurs at the bending position of the peripheral U-shaped copper bar, so that the static contact structure 110 is not greatly influenced, and the closing is facilitated.

While the application has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present application may be embodied in several forms without departing from the spirit or essential attributes thereof, it should be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalences of such metes and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A stationary contact apparatus, comprising:

2. A stationary contact apparatus according to claim 1, wherein,

The outer surface of the conductor is a plane and/or an arc surface.

3. The stationary contact apparatus according to claim 1 or 2, characterized in that,

The conductor is of a bending structure and is bent to form a first side part, a second side part and a third side part, the first side part and the second side part are opposite in position and have a distance, the third side part is connected with the first side part and the second side part, so that a containing space is surrounded by the first side part, the second side part and the third side part, and the static contact structure is positioned in the containing space;

4. A stationary contact apparatus according to claim 3, wherein,

The second side part is provided with a first connecting structure, and the fixed contact structure is connected with the first connecting structure so as to be fixed on the conductor.

5. A stationary contact apparatus according to claim 3, wherein,

One end of the first side part far away from the third side part protrudes a certain length relative to the second side part, and one end of the first side part far away from the third side part is provided with a second connecting structure used for fixing.

6. The stationary contact apparatus according to claim 1 or 2, characterized in that,

The contact part comprises at least one pair of contact fingers, and the two contact fingers in the pair are opposite in position and are arranged at intervals;

7. The stationary contact apparatus according to claim 6, wherein,

The avoidance port is of a closed annular structure.

8. The stationary contact apparatus according to claim 1 or 2, characterized in that,

The conductor comprises a metal piece;

The metal piece comprises a copper bar.

9. A grounding switch, comprising:

A bracket;

the movable contact is rotatably arranged on the bracket;

The stationary contact apparatus according to any one of claims 1 to 8, wherein the movable contact is rotatable relative to the stationary contact apparatus and is contactable with or separable from a contact portion of the stationary contact apparatus via an escape port of the stationary contact apparatus.

10. The grounding switch as in claim 9, wherein,

The conductor of the static contact device is arranged on the bracket.