CN218040238U - Reserved interval for electrified extension - Google Patents

Abstract

The utility model relates to a reservation interval of electrified extension. In the isolating switch for the extension reserved with the interval, the electric conductor is an integrated electric conducting rod, two ends of the integrated electric conducting rod are respectively in electric conduction connection with movable contact seats in two adjacent bus isolating switches, so that the structure of the electric conductor is simplified, the assembly time of the reserved interval is reduced, and the improvement of the through-current capacity of the electric conductor is facilitated; and realize operating the end through the transmission shaft and be connected with the transmission of moving contact, help simplifying the structure of drive mechanism among the isolator for the extension, the isolator upside does not need to set up additional shell structure for the extension, helps reducing and reserves spaced cost.

Description

Reserved interval for live extension

Technical Field

The utility model relates to a gas insulated switch technical field, concretely relates to reservation interval of electrified extension.

Background

GIS is widely applied to transformer substation construction due to the advantages of compact structure, small occupied area, high operation reliability, long maintenance period and the like. With the development of national economy, the power load is rapidly increased, and the power failure problem caused by project expansion in the later stage of the GIS is more and more serious.

In the prior art, an interval is reserved in a GIS to meet the requirement of electrified extension in the later extension process. For example, the invention patent document with an authorization notice number of CN106058709B and an authorization notice date of 2018, 2.2.2 discloses a GIS reserved interval, as shown in fig. 1, the reserved interval includes a first isolating switch 101 and a second isolating switch 102 which are arranged in parallel, and further includes an expanding isolating switch 103 which is located between the two isolating switches, an upper end of a stationary contact seat of the first isolating switch 101 is conductively connected with a first bus 104, an upper end of a stationary contact seat of the second isolating switch 102 is conductively connected with a second bus 105, the expanding isolating switch 103 is hermetically butted with the two isolating switches, a conductor 106 in the expanding isolating switch 103 is conductively connected with a movable contact seat of the first isolating switch 101 and is also conductively connected with a movable contact seat of the second isolating switch 102, and the expanding isolating switch 103 has a downward expanding interface end 107. In the reservation interval that above-mentioned structure set up, not only have main bus isolator to carry out electrical isolation between electrified operation's main bus and the extension interface, but also extension carries out electrical isolation with isolator, and extension work can be gone on under main bus normal operating, need not to control the main bus and has a power failure completely, satisfies electrified extension demand.

In the GIS reserved interval, as shown in fig. 1, the moving contact 108 and the fixed contact 109 of the isolating switch 103 for extension are arranged in the vertical direction, the moving contact 108 is connected with the operating end of the isolating switch 103 for extension through the pull rod 110 and the connecting lever 111, the operating end is located above the moving contact 108 and between two buses, in the process of operating the isolating switch 103 for extension, an operator needs to manually operate the operating end at a high position, the operating end is closer to the main bus, and the live operation of the main bus easily causes greater psychological pressure to the operator; the pull rod 110 and the crank arm 111 are both positioned on the upper side of the moving contact 108, and the pull rod 110 needs to be provided with a guide structure, so that the transmission structure of the isolation switch 103 for extension is relatively complex; the upper side of the isolation switch 103 for extension is connected with a crank arm box 112, the crank arm box 112 is generally formed by integral casting, the crank arm box 112 needs to be manufactured by die sinking, and the cost is high; and extension is connected with isolator 103 casing through ripple 113 pipe and one of them side isolator's casing, if the internal insulator discharges and punctures when needing the maintenance, need open the ripple 113 and take out conductive conductor, moving contact 108 and insulator in proper order, inconvenient later stage to the maintenance of reservation interval.

In addition, as shown in fig. 2, in the reserved space, a connection air chamber 202 is additionally arranged above the extension disconnector 201 and between disconnectors in two bus units, a housing of the connection air chamber 202 is connected with a disconnector housing in the two bus units and a housing of the extension disconnector 201 through flanges, a conductor 203 is arranged in the connection air chamber 202 and is electrically connected with three disconnectors, a window is opened on a side of the housing of the extension disconnector 201 to allow a transmission shaft 204 driving a moving contact 205 to pass through, an operating end for operating the moving contact 205 to operate is arranged below the conductor 203, so that an operator can operate a switching-on and switching-off operation of the extension disconnector 201 conveniently, and the moving contact 205 of the extension disconnector 201 is connected with the transmission shaft 204 without additionally arranging a guide structure, only a window is opened on the housing of the extension disconnector 201, and a crank arm box is not required to be additionally arranged, which is beneficial to simplifying the structure of the space and reducing the cost of the space; if the extension-used isolating switch 201 is discharged and broken down and needs to be maintained, only the sealing structure at the position of the shell window of the extension-used isolating switch 201, through which the transmission shaft 204 penetrates out, needs to be disassembled, and parts needing to be maintained can be taken out, so that later maintenance is facilitated.

In the two reserved intervals, the conductor for realizing the conductive connection of the isolation switches in the two bus units is provided with at least three sections, the structure of the conductor is relatively complex, and long time is needed to be spent when the reserved intervals are assembled.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reservation interval of electrified enlargement to solve the technical problem that prior art's reservation interval structure is complicated, the assembly is long consuming time.

The utility model discloses a reserve interval of electrified extension adopts following technical scheme:

the utility model provides a reserve interval of electrified extension, including the busbar unit who arranges side by side and the isolator for extension that is in between two adjacent busbar units, each busbar unit includes main bus and the busbar isolator who is connected with main bus electricity conduction, isolator for extension and two adjacent busbar isolators are sealed butt joint, isolator for extension has extension interface end down, be equipped with the electric conductor in the isolator for extension, the electric conductor formula conducting rod as an organic whole, the conducting rod both ends of an organic whole are connected with the movable contact seat among two adjacent busbar isolators respectively electrically conductive, the electrically conductive stationary contact seat that is connected with on the electric conductor, the movable contact seat is located the stationary contact seat below, movable contact seat and moving contact are the direction cooperation in upper and lower direction, isolator for extension includes the transmission shaft that is located the electric conductor below, one end is worn out the casing of isolator for extension, the other end stretches into in the movable contact seat and is connected with the moving contact transmission, be used for the drive to move in upper and lower direction.

The utility model has the advantages that: the utility model discloses an in the interval is reserved in electrified extension, set up integral type conducting rod in the isolator for extension, make integral type conducting rod both ends respectively with the electrically conductive connection of the movable contact base in two adjacent generating line isolator to simplify the electric conductor structure, reduce and reserve the interval and assemble long time, and set up the electric conductor into integral type conducting rod structure and help improving the through-flow capacity of electric conductor, avoid the assembly connection position department to discharge and reduce the insulating properties of the air chamber that the conducting rod is located, help improving the safety and stability in the operation process of reserving the interval; in addition, a movable contact base in the isolating switch for the extension is arranged below the static contact base, and a transmission shaft positioned below the electric conductor drives the movable contact to be matched with the movable contact base in an up-and-down guiding manner, so that an operator can conveniently operate the operating end of the isolating switch for the extension at a position which is low and far away from the electrified bus; and realize operating the transmission of end and moving contact through the transmission shaft and be connected, help simplifying the structure of drive mechanism among the isolator for the enlargement, the isolator upside for the enlargement need not set up additional shell structure, only need set up on isolator for the enlargement below the electric conductor the casing that supplies the transmission shaft to stretch out can, help reducing and reserve spaced cost.

Furthermore, insulating basins are respectively arranged between the shell of the isolating switch for the extension and the shells of the two adjacent bus isolating switches in a sealing mode, a conductive insert which is in conductive connection with a movable contact base in the corresponding bus isolating switch is installed on one insulating basin, a conductive contact base which is in conductive connection with the movable contact base in the corresponding bus isolating switch is installed on the other insulating basin, one end of the integrated conductive rod is fixedly connected with the conductive insert, and the other end of the integrated conductive rod is matched with the conductive contact base in a conductive insertion mode.

The beneficial effects are as follows: above-mentioned structure setting can have the electric current to pass through and lead to the integral type conducting rod to generate heat in the integral type conducting rod, can lead to its deformation that takes place in length direction through conducting rod and the electrically conductive cartridge cooperation compensation conducting rod expend with heat and contract with cold between the seat of touching with electrically conductive.

Furthermore, the static contact seat and the integrated conducting rod in the isolating switch for the extension are of an integrated structure.

The beneficial effects are as follows: the aforesaid sets up the integral type structure with stationary contact seat and integral type conducting rod and helps improving the structural strength of stationary contact seat and integral type conducting rod, avoids the through-flow in-process of integral type conducting rod to generate heat and leads to warping.

Further, the static contact base protrudes downwards and is arranged on the integrated conducting rod.

The beneficial effects are as follows: the structural arrangement can ensure the integrity of the conducting rod and ensure the structural strength and the current capacity of the conductor.

Furthermore, the housing of the extension isolating switch is of a T-shaped structure and comprises a horizontal section and a vertical section, the integrated conducting rod is located in the horizontal section, and the movable contact base of the extension isolating switch is located in the vertical section.

The beneficial effects are as follows: in the structure, the shell of the isolating switch for extension is set to be of a T-shaped structure so as to adapt to the arrangement structure of the integrated conducting rod and the moving contact and the static contact in the isolating switch for extension in the vertical direction, simplify the structure of the shell of the isolating switch for extension, reduce the mold cost of the shell of the isolating switch for extension and reduce the cost of reserved intervals.

Furthermore, a rack extending in the up-down direction is arranged on the moving contact, a gear meshed with the rack is connected to the transmission shaft, and the transmission shaft drives the moving contact to reciprocate in the up-down direction through the rack and the gear.

The beneficial effects are as follows: the structure that the moving contact is driven to move up and down in a reciprocating mode through the gear and rack meshing is simple, occupied space is small, and the structure is favorable for improving the structural stability of the moving contact in the moving process.

Furthermore, the moving contact base is of a cylindrical structure with an opening at the upper end, and the moving contact is in guiding fit with the inner cylinder wall of the cylindrical structure in the vertical direction.

The beneficial effects are as follows: set the movable contact seat to tubular structure, through tubular structure's inner tube wall and movable contact direction cooperation, need not to set up other and movable contact direction complex structures in isolator for the extension, help simplifying isolator for the extension and whole electrified extension and reserve spaced structure.

Furthermore, the inner cylinder wall of the movable contact base is provided with a weight reduction groove.

The beneficial effects are as follows: the structure is provided to help reduce the weight of the movable contact base and the equipment gravity borne on the isolation switch shell for extension.

Furthermore, the weight reduction grooves are annular grooves, at least two weight reduction grooves are arranged, the weight reduction grooves are arranged at intervals in the vertical direction, and guide sections matched with the movable contact in a guide mode are formed in the grooves of the annular grooves along the section of the inner cylinder wall where the annular grooves are located.

The beneficial effects are as follows: the structure arrangement can form a plurality of guide sections matched with the movable contact in a guide way on the movable contact base, and is beneficial to improving the guidance of the movable contact base to the movable contact.

Furthermore, a shell through hole is formed in a shell of the isolation switch for the extension, a sealing cover is installed on the shell through hole, the transmission shaft penetrates through the sealing cover, a moving contact seat through hole for the transmission shaft to penetrate through is formed in the moving contact seat, the transmission shaft comprises an insulating shaft section, the insulating shaft section is located in the shell of the isolation switch for the extension, one end of the insulating shaft section extends into the sealing cover, and the other end of the insulating shaft section extends into the moving contact seat through hole.

The beneficial effects are as follows: above-mentioned structure sets up and can guarantee to be located the transmission shaft section of enlargement in with isolator air chamber for insulating section, helps reducing the risk of discharge breakdown in the isolator air chamber for the enlargement to above-mentioned structure sets up when the isolator internal insulation discharges and punctures and needs the maintenance for the enlargement, only needs open the sealed lid that supplies the transmission shaft to stretch out, can take out and need maintain the part, makes things convenient for the later stage to reserving spaced maintenance.

Drawings

Fig. 1 is a schematic structural diagram of a GIS reserved interval in the prior art;

fig. 2 is a schematic diagram of another structure of a GIS reserved interval in the prior art;

fig. 3 is a schematic structural diagram of the reserved space of the live extension of the present invention in embodiment 1;

FIG. 4 is a right side view of FIG. 3;

fig. 5 is a schematic structural view of the extension disconnector in fig. 3;

in fig. 1 and 2:

101. a first isolation switch; 102. a second isolation switch; 103. an extension disconnector; 104. a first bus bar; 105. a second bus bar; 106. an electrical conductor; 107. extending an interface end; 108. a moving contact; 109. static contact; 110. a pull rod; 111. a crank arm; 112. a crank arm box; 113. a bellows; 201. an extension disconnector; 202. connecting the air chamber; 203. an electrical conductor; 204. a drive shaft; 205. a moving contact;

in fig. 3 to 5:

1. a first bus bar unit; 2. a second bus bar unit; 3. a first main bus; 4. a second main bus; 5. a first isolation switch; 6. a second isolation switch; 7. a sealing cover; 8. an extension disconnector; 9. a ground terminal; 10. an integral conductive rod; 11. extending an interface end; 12. a movable contact base; 13. a stationary contact base; 14. a moving contact; 15. a drive shaft; 16. a housing of the extension disconnector; 17. an annular groove; 18. a guide section; 19. insulating the shaft section; 20. a conductive insert; 21. a conductive contact base; 22. a horizontal segment; 23. a vertical section.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention, i.e., the described embodiments are merely illustrative of some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention 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, which may be present, 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, terms such as "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, an element defined by the language "comprising one of 8230; \8230;" etc. does not exclude a process, method or the like that comprises such an element.

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 through specific situations.

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 reserve spaced embodiment 1 of electrified extension:

as shown in fig. 3 to 4, the reserved interval of the live extension in the present embodiment includes a first bus bar unit 1 and a second bus bar unit 2 arranged in parallel. The first bus unit 1 comprises a first main bus 3 and a first isolating switch 5 which is positioned below the first main bus 3 and is in conductive connection with the first main bus 3, and a shell of the first isolating switch 5 is in sealing connection with a shell of the first main bus 3 through a flange and an insulating basin. The second bus unit 2 comprises a second main bus 4 and a second isolating switch 6 which is positioned below the second main bus 4 and is in conductive connection with the second main bus 4, wherein a shell of the second isolating switch 6 is connected with a shell of the second main bus 4 through a second flange and sealed through a second insulating basin. The moving contact seat in each isolating switch is positioned below the static contact seat, wherein a grounding terminal 9 is arranged on one side of the shell of the first isolating switch 5, which is positioned on the moving contact seat and is back to the static contact seat, and the moving contact in the first isolating switch 5 can be in conductive communication with the grounding terminal 9 in the process of up-and-down guiding movement in the moving contact seat so as to form the grounding switch in the first isolating switch 5.

In this embodiment, as shown in fig. 3, the reserved interval for live extension further includes an extension disconnecting switch 8 located between the first disconnecting switch 5 and the second disconnecting switch 6, a housing of the extension disconnecting switch 8 is butted with a housing of the first disconnecting switch 5 and a housing of the second disconnecting switch 6 through flanges, two adjacent disconnecting switches are sealed by an insulating basin to form an independent air chamber in each disconnecting switch housing, the extension disconnecting switch 8 includes a conductor located in the housing and horizontally arranged, and two ends of the conductor are respectively in conductive connection with a moving contact in the first disconnecting switch 5 and a moving contact in the second disconnecting switch 6.

Specifically, as shown in fig. 3, the conductive rod 10 with the integrated conductive body is helpful for simplifying the structure of the conductive body, reducing the assembly time of the reserved interval, improving the structural strength of the conductive body and the current capacity of the conductive body, and also can avoid the reduction of the insulation performance of the isolation switch air chamber for extension due to the fact that the conductive body discharges at the assembly connection position due to the adoption of the assembly structure, and is helpful for improving the safety and stability in the operation process of the reserved interval. The housing 16 of the isolation switch for expansion is in a T-shaped structure and comprises a horizontal section 22 and a vertical section 23, the lower port of the vertical section forms an expansion interface end 11, and the expansion interface end 11 is connected with a shielding structure through an insulation basin and a flange before expansion. The two ends of the horizontal segment 22 are respectively sealed with the shell of the first isolating switch 5 and the shell of the second isolating switch 6 through insulating basins, the insulating basin on the side of the first isolating switch is provided with a conductive insert 20, the conductive insert 20 is conductively connected with the movable contact base of the first isolating switch 5, the insulating basin on the side of the second isolating switch is provided with a conductive contact base 21, the conductive contact base 21 is conductively connected with the movable contact base of the second isolating switch 6, one end of the integrated conductive rod 10 is fixedly connected with the conductive insert 20, the other end of the integrated conductive rod is in plug-in fit with the conductive contact base 21, when current passes through the integrated conductive rod 10 and the integrated conductive rod 10 is heated, and the integrated conductive rod 10 is compensated through the plug-in fit between the integrated conductive rod 10 and the conductive contact base 21 to expand with heat and contract with cold to cause the deformation of the integrated conductive rod 10 in the length direction.

The extension isolating switch 8 further comprises a static contact seat 13 and a movable contact seat 12 which are positioned in the shell and are arranged at intervals in the vertical direction, and the static contact seat 13 is in conductive connection with the integrated conducting rod 10. As shown in fig. 3, the integrated conducting rod 10 is disposed in the horizontal section 22 of the housing 16 of the extension disconnector, the fixed contact base 13 is disposed on the integrated conducting rod 10 in a downward protruding manner, and the movable contact base 12 is disposed in the vertical section 23 of the housing 16 of the extension disconnector, so that the housing 16 of the extension disconnector is adapted to the integrated conducting rod 10 and the arrangement structure of the movable contact base 12 and the fixed contact base 13 in the extension disconnector in the vertical direction, the housing structure of the extension disconnector is simplified, the housing mold cost of the extension disconnector is reduced, and the cost of reserved intervals is reduced.

As shown in fig. 3, the stationary contact 13 is integrally provided with the integrated conducting rod 10, and this structural arrangement also helps to improve the structural strength of the integrated conducting rod 10, and avoids the reduction of the gas insulation performance in the extension disconnector housing due to the connection structure between the stationary contact 13 and the integrated conducting rod 10.

In this embodiment, the movable contact base 12 is a tubular structure with an open upper end, the closed end of the movable contact base 12 is fixed on the insulating basin, the open end is arranged toward the stationary contact base 13, and the movable contact 14 in the extension disconnecting switch 8 is in guiding fit with the inner tubular wall of the tubular structure of the movable contact base 12 in the up-down direction. As shown in fig. 3 and 5, two weight-reducing grooves are formed in the inner cylinder wall of the movable contact base 12, the two weight-reducing grooves are arranged at intervals in the vertical direction, each weight-reducing groove is an annular groove 17 to reduce the weight of the movable contact base 12 and the equipment gravity borne by the housing of the extension-use isolating switch 8, a guide section 18 in guiding fit with the movable contact 14 is formed in a groove of the annular groove 17 along the inner cylinder wall where the annular groove 17 is located, the annular groove 17 located on the lower side of the two annular grooves 17 is arranged close to the cylinder bottom of the cylindrical structure, so that the inner cylinder wall between the two annular grooves 17 and the inner cylinder wall at the opening position of the cylindrical structure are both in guiding fit with the movable contact 14, and the guiding property of the movable contact base 12 to the movable contact 14 is improved.

In this embodiment, as shown in fig. 3 and 5, the extension disconnecting switch 8 further includes a transmission shaft 15 below the integrated conducting rod 10, an extending direction of the transmission shaft 15 is the same as an extending direction of the integrated conducting rod 10, a moving contact through hole is formed in a side wall of the moving contact 12, a housing through hole coaxially arranged with the moving contact through hole is correspondingly formed in a housing 16 of the extension disconnecting switch corresponding to the moving contact through hole, a sealing cover 7 is installed in the housing through hole, one end of the transmission shaft 15 penetrates through the moving contact through hole and is in transmission connection with the moving contact 14, and the other end penetrates through the sealing cover 7 to form an operating end of the extension disconnecting switch 8. The end part of the transmission shaft 15 in transmission connection with the moving contact 14 is connected with a gear, the moving contact 14 is provided with a rack extending in the up-down direction, the gear is meshed with the rack, and the moving contact 14 can move up and down in the moving contact base 12 in a guiding manner through the transmission shaft 15.

In this embodiment, as shown in fig. 3 and 5, the transmission shaft 15 is respectively matched with the sealing cover 7 and the moving contact base through hole in a sealing manner, the transmission shaft 15 includes an insulating shaft section 19, the insulating shaft section 19 is located in the housing 16 of the extension disconnector, one end of the insulating shaft section 19 extends into the sealing cover 7, and the other end of the insulating shaft section extends into the moving contact base through hole, so as to ensure that the section of the transmission shaft 15 exposed outside in the housing 16 of the extension disconnector is an insulating section, which is beneficial to reducing the risk of electrical breakdown in the gas chamber of the extension disconnector 8.

In this embodiment, as shown in fig. 4, three phases in each bus unit are in a common box, three phases in each disconnecting switch are in a separate box, and the live extension reservation apparatus further includes a support, where the support is used to support a disconnecting switch housing in each bus unit, and is used to raise an extension interface end 11 of the isolating switch 8 for extension, so that a circuit breaker is conveniently connected to the extension interface end 11 during extension.

The live-line extension reserved interval of the embodiment is in a live-line extension process, two main buses are electrified, so that the first isolating switch 5 and the second isolating switch 6 are in an open-brake disconnection state, the grounding switch in the first isolating switch 5 is in a closed-brake state, the movable contact base of the first isolating switch 5, the movable contact base of the second isolating switch 6 and the extension isolating switch 8 are ensured to be wholly at zero potential, after insulating gas in the shell 16 of the extension isolating switch is reduced in voltage, the shielding structure of the extension interface end 11 is removed, the extension interface end 11 is butted with a circuit breaker, and finally, a support is removed to complete extension operation.

In this embodiment, one isolating switch 8 for extension is added between the isolating switches of two bus units, so that two isolating fractures are formed between the extension interface end 11 and each main bus, one isolating fracture is in the bus unit, the other isolating fracture is in the isolating switch 8 for extension, and the isolating switch 8 for extension can be used as one of the double fractures, so as to play a role in electrically isolating the main bus from the extension part, and can also be used as a transition air chamber for butt-joint installation, so that the pressure difference between two sides of an insulating basin between two adjacent isolating switches is reduced, and the personal safety of operators is ensured.

In the extension process, if the first isolating switch 5 or the second isolating switch 6 is broken down to discharge, the discharge current can be led into the ground through the grounding end and cannot flow into the extension interface end 11 of the isolating switch 8 for extension, and because the isolating switch 8 for extension is wholly in the grounding state in the extension process, the isolating switch 8 for extension cannot be broken down, and the safety of extension workers can be effectively ensured.

Carry out withstand voltage test in-process after the extension is accomplished, if take place discharge phenomenon and lead to the extension to switch on with isolator 8 port, the fault current can be through the leading-in ground of integrated conducting rod 10 and the earthing terminal 9 among the first isolator 5, the moving contact of first isolator 5 and the moving contact of second isolator 6 are because with earthing terminal 9 intercommunication, the voltage is zero potential, can guarantee the electrical insulation of first isolator fracture and second isolator fracture, keep apart the trouble at the extension isolator part, can not transmit to electrified main bus part, thereby can not influence electrified partial normal operating.

In this embodiment, after the extension operation is completed, an operator operates the operation end of the extension disconnecting switch 8 to make the extension disconnecting switch 8 in a closing conducting state, and then operates the first disconnecting switch 5 and the second disconnecting switch 6 to make both disconnecting switches in the closing conducting state to operate the breaker to normally supply power after closing.

In the reserved interval of the live-line extension of the embodiment, the movable contact base 12 in the isolation switch 8 for extension is arranged below the fixed contact base 13, and the movable contact 14 and the movable contact base 12 are driven to be matched in a vertical guiding manner through the transmission shaft 15 positioned below the electric conductor, so that an operator can conveniently operate the operation end of the isolation switch 8 for extension at a position which is low and far away from a live main bus, the operation of the operator is facilitated, and the psychological pressure of the operator can be reduced; and the extension is with isolator 8 in this embodiment drives the transmission structure that moving contact 14 leads removal from top to bottom through transmission shaft 15 and rack and pinion, and is simple, compact, help reducing extension with isolator 8's volume, simplify extension with isolator 8 in the structure of drive mechanism, and compare with the reservation interval among the prior art, reserve interval extension in this embodiment and use isolator 8 upside and need not set up shell structure in addition, only need set up the casing perforation that supplies transmission shaft 15 to stretch out on extension with isolator's casing 16 below the electric conductor can, help reducing the cost of reserving the interval.

In this embodiment, among the above-mentioned isolator 8 for extension's structural configuration, need not set up the bellows between two adjacent isolators, when its inside insulator discharge punctures and needs the maintenance, only need open the sealed lid 7 that supplies transmission shaft 15 to stretch out on isolator's for extension casing 16, can take out the inside insulating part that needs the maintenance, make things convenient for the later stage to reserve spaced maintenance.

The utility model discloses a reserve spaced embodiment 2 with electricity extension:

the difference from the specific example 1 is that: the transmission shaft is in transmission connection with the moving contact through a connecting lever and a connecting rod, one end of the connecting lever is fixed on the transmission shaft, one end of the connecting rod is hinged with the other end of the connecting lever, and the other end of the connecting rod is hinged with the end, back to the static contact seat, of the moving contact so as to drive the moving contact to move up and down in the moving contact seat through the transmission shaft.

The utility model discloses a reserve spaced embodiment 3 of electrified extension:

the difference from the specific example 1 is that: the movable contact seat is a C-shaped structure with an opening at the circumferential side part, a weight reduction groove is not arranged on the movable contact seat, and a guide section matched with the movable contact in a guide way is formed on the inner peripheral wall of the C-shaped structure.

In other embodiments, the movable contact base is a cylindrical structure, the movable contact is a tubular structure, and the peripheral surface of the movable contact base forms a guide section which is matched with the movable contact in a guide way.

The utility model discloses a reserve spaced embodiment 4 of electrified extension:

the differences from the specific example 1 are: the number of the annular grooves on the inner cylinder wall of the movable contact seat is three, and the annular grooves are arranged at intervals in the axial direction of the movable contact seat. In other embodiments, the number of the annular grooves on the inner cylinder wall of the movable contact base can also be four, five or more than six.

The utility model discloses a reserve spaced embodiment 5 of electrified extension:

the difference from the specific example 1 is that: the inner cylinder wall of the movable contact seat is not provided with an annular groove, and the weight reduction grooves on the inner cylinder wall of the movable contact seat are circumferentially arranged at intervals.

The utility model discloses a reserve spaced embodiment 6 of electrified extension:

the difference from the specific example 1 is that: according to the arrangement requirement of construction occasions, the extending direction of the transmission shaft is perpendicular to the extending direction of the conducting rod, and the structure arrangement is convenient for operators to operate the operation end of the isolation switch for extension at a low position.

The utility model discloses a reserve spaced embodiment 7 of electrified extension:

the difference from the specific example 1 is that: the static contact seat is fixed on the mounting surface of the conductive rod through a bolt.

The utility model discloses a reserve spaced embodiment 8 of electrified extension:

the difference from the specific example 1 is that: the conducting rod is provided with an inward concave part, and the inward concave part forms a static contact seat which is inserted and matched with the moving contact.

The utility model discloses a reserve spaced embodiment 9 of electrified extension:

the difference from the specific example 1 is that: the transmission shaft is made of insulating materials so as to ensure the gas insulation property in the isolation switch shell for extension.

The utility model discloses a reserve spaced embodiment 10 of electrified extension:

the differences from the specific example 1 are: the transmission shaft is arranged in a downward inclined mode, an acute angle is formed between the axis of the transmission shaft and the axis of the conducting rod, the operating end of the transmission shaft is lower than the connecting end of the transmission shaft and the moving contact, and the rack on the moving contact is arranged in an upward inclined mode in the axial direction of the moving contact so as to ensure that the moving contact can move in a guiding mode in the up-and-down direction under the driving of the transmission shaft and the meshing gear rack.

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 the technical solutions described in the foregoing embodiments may be modified without inventive effort, or some technical features may be substituted equally. 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 (9)

1. A reserved interval for electrified extension comprises bus units arranged in parallel and isolating switches (8) for extension positioned between two adjacent bus units, each bus unit comprises a main bus and a bus isolating switch in conductive connection with the main bus, each isolating switch (8) for extension is in sealed butt joint with the two adjacent bus isolating switches, and each isolating switch (8) for extension is provided with a downward extension interface end (11), the interval is characterized in that a conductor is arranged in each isolating switch (8) for extension and is an integrated conducting rod (10), two ends of each integrated conducting rod (10) are respectively in conductive connection with moving seats in the two adjacent bus isolating switches, each conductor is in conductive connection with a fixed contact seat (13), each moving contact seat (12) is positioned below the corresponding fixed contact seat (13), each moving contact seat (12) is in guide fit with each moving contact (14) in the up-down direction, each isolating switch (8) for extension comprises a transmission shaft (15) positioned below, one end of each transmission shaft (15) penetrates through a shell (16) of each isolating switch for extension, the other end of each moving contact seat (12) is connected with each moving contact (14) in the up-down direction, and used for driving the moving contacts (14);

a shell perforation is arranged on a shell (16) of the isolation switch for the extension, a sealing cover (7) is installed on the shell perforation, a transmission shaft (15) penetrates through the sealing cover (7), a moving contact seat perforation for the transmission shaft (15) to penetrate through is arranged on a moving contact seat (12), the transmission shaft (15) comprises an insulating shaft section (19), the insulating shaft section (19) is located in the shell (16) of the isolation switch for the extension, one end of the insulating shaft section extends into the sealing cover (7), and the other end of the insulating shaft section extends into the moving contact seat perforation.

2. The pre-set interval of the electrified extension according to claim 1, characterized in that insulation basins are respectively arranged between the housing (16) of the extension disconnector and the housings of two adjacent busbar disconnectors in a sealing manner, one insulation basin is provided with a conductive insert (20) which is in conductive connection with the movable contact base in the corresponding busbar disconnector, the other insulation basin is provided with a conductive contact base (21) which is in conductive connection with the movable contact base in the corresponding busbar disconnector, one end of the integrated conductive rod (10) is fixedly connected with the conductive insert (20), and the other end of the integrated conductive rod is in conductive plug-in fit with the conductive contact base (21).

3. -a pre-established gap according to claim 2, characterised in that the static contact seat (13) in the extension disconnector (8) is of one-piece construction with an integral conducting rod (10).

4. -an electrically enlarged obligatory interval according to claim 3, characterized in that said static seat (13) is provided projecting downwards on an integral conductive rod (10).

5. An electrified extension obligatory interval according to any of the claims 1 to 4, characterized in that the casing of the extension disconnector (8) is of T-shaped structure, comprising a horizontal section and a vertical section, the integrated conducting rod (10) being located in the horizontal section and the movable contact base (12) of the extension disconnector (8) being located in the vertical section.

6. The reserved interval of the charged extension according to any one of claims 1 to 4, wherein a rack extending in the up-down direction is provided on the movable contact (14), a gear engaged with the rack is connected to the transmission shaft (15), and the transmission shaft (15) drives the movable contact (14) to reciprocate in the up-down direction through the rack and the gear.

7. The pre-set space of an electrified extension according to any one of claims 1-4, characterized in that the moving contact base (12) is a tubular structure with an open upper end, and the moving contact (14) is in guiding fit with the inner tubular wall of the tubular structure in the up-down direction.

8. The pre-set interval for electrified extension according to claim 7, characterized in that the inner cylinder wall of the moving contact base (12) is provided with weight-reducing grooves.

9. The pre-set space of the live extension according to claim 8, wherein the lightening grooves are annular grooves (17) and there are at least two lightening grooves, each lightening groove is arranged at intervals in the up-down direction, and the grooves of the annular grooves (17) form guiding sections (18) which are in guiding fit with the movable contacts (14) along the inner cylinder wall section.

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