A gas insulated PT cabinet

Abstract

The present application relates to a kind of gas insulation PT cabinet, the PT cabinet includes cabinet, three-phase busbar is arranged in the cabinet, three-phase busbar is spaced along longitudinal direction, longitudinal direction is the cabinet depth direction;It further includes three-phase disconnecting switch corresponding to three-phase busbar one by one below busbar, three-phase disconnecting switch is spaced along longitudinal direction;Cabinet is further provided with three-phase busbar below disconnecting switch and corresponding to three-phase disconnecting switch one by one, the bottom of each busbar is provided with voltage transformer and arrester, and the voltage transformer, arrester of same phase is sequentially arranged along busbar;Three-phase busbar is spaced along transverse direction, transverse direction is the width direction of cabinet and vertical to longitudinal direction, and each phase busbar is connected between corresponding phase disconnecting switch by turning conductor;The end of the busbar is wrapped with insulating cover body.The present application effectively solves the technical problem that each phase busbar with arrester, voltage transformer in prior art cannot be transversely arranged, leading to maintenance difficulty.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-voltage electrical switchgear, and particularly relates to a gas-insulated PT cabinet. BACKGROUND

[0002] The air-charge cabinet seals the circuit breaker, grounding switch, disconnecting switch and other devices in the gas chamber filled with sulfur hexafluoride or other insulating gas to ensure the insulation performance of the switchgear. The air-charge cabinet has the advantages of compact structure, high insulation reliability, maintenance-free and the like, and is more and more valued by the market.

[0003] As one of the air-charge cabinets, the gas-insulated PT cabinet is provided with a disconnecting switch at the upper middle part, a busbar connected above the disconnecting switch, a voltage transformer and a surge arrester arranged at the bottom of the cabinet body, and the voltage transformer and the surge arrester are connected with the disconnecting switch of the same phase. In the prior art, the length of the PT cabinet in the depth direction (longitudinal direction) is usually greater than the length in the width direction (transverse direction), and in order to ensure the phase-to-phase insulation, the busbars, disconnecting switches, voltage transformers and surge arresters in the PT cabinet are arranged longitudinally and spaced apart along the depth direction of the cabinet body. However, this also brings many inconveniences. The maintenance door is usually located at one end in the longitudinal direction, and when the voltage transformer or the surge arrester (especially the middle phase) fails, the voltage transformers and surge arresters of the side phases need to be removed first, and then the voltage transformer or the surge arrester of the middle phase is repaired. Therefore, the repair of the voltage transformer not only wastes time, but also wastes energy.

[0004] The Chinese patent application with the application publication number CN108306208A and the application publication date of July 20, 2018 discloses a solid insulation PT cabinet, which is provided with longitudinally spaced busbars, disconnecting switches and transversely arranged voltage transformers. The switch devices and the corresponding voltage transformers are connected through the turning cable, so that the longitudinal and transverse arrangement between the switch devices and the voltage transformers can be realized. In this way, the repair of any voltage transformer can be completed through the maintenance door at one longitudinal side without disassembling other voltage transformers.

[0005] The solid insulation PT cabinet in the prior art only has voltage transformers, but usually, in order to protect the devices of each phase, a surge arrester is also arranged. The voltage transformers and the surge arresters of the same phase are connected at the bottom of the same busbar. At this time, in order to realize the transverse and spaced arrangement of the voltage transformers and the surge arresters of each phase, the busbars of each phase also need to be arranged transversely. However, due to the limitation of the transverse size of the cabinet body, the spacing between the adjacent phase busbars is small, and the discharge phenomenon easily occurs between the ends of the busbars, the insulation performance is poor, and the use requirements cannot be met. Therefore, when the PT cabinet is provided with both the surge arrester and the voltage transformer, the busbars still need to be arranged longitudinally, and the problem of difficult maintenance still exists. SUMMARY

[0006] The application aims to provide a gas insulation PT cabinet to solve the technical problem that the transverse arrangement of the phase bus bars with lightning arresters and voltage transformers in the prior art causes difficulty in maintenance.

[0007] To achieve the above-mentioned purpose, the gas insulation PT cabinet in the application adopts the following technical scheme:

[0008] The gas insulation PT cabinet comprises a cabinet body, a three-phase bus bar arranged in the cabinet body, the three-phase bus bar being arranged in the longitudinal direction, the longitudinal direction being the depth direction of the cabinet body; three-phase disconnectors corresponding to the three-phase bus bar and arranged in the longitudinal direction below the bus bar; three-phase bus bars corresponding to the three-phase disconnectors and arranged in the transverse direction below the disconnectors, the transverse direction being the width direction of the cabinet body and being perpendicular to the longitudinal direction, each phase bus bar being connected to the corresponding phase disconnector through a turning conductor; and an insulating cover arranged on the end of the bus bar.

[0009] The above-mentioned technical scheme has the following beneficial effects: in the gas insulation PT cabinet, the three-phase bus bars are arranged in the transverse direction, and the end of the bus bar comprises an insulating cover, so that the insulation between the ends of the bus bars is ensured by the insulating cover, the discharge between the ends of the bus bars is avoided, the transverse arrangement of the three-phase bus bars meets the use requirements, the transverse arrangement of the voltage transformers and the lightning arresters of each phase is realized, and when the voltage transformer or the lightning arrester is maintained, the maintenance of any voltage transformer or lightning arrester can be completed through the maintenance door on the longitudinal side, compared with the prior art, the voltage transformer or lightning arrester of the adjacent phase does not need to be removed, time and energy are saved, and the maintenance is facilitated.

[0010] Further, the bus bar comprises a main conductor connected to the voltage transformer and the lightning arrester, and a transition conductor detachably assembled on the end of the main conductor through a bolt, the insulating cover is integrally cast on the outside of the end of the transition conductor away from the main conductor, the end of the main conductor is provided with a threaded hole, and the insulating cover and the transition conductor are both provided with a through hole through which the bolt passes.

[0011] The above-mentioned technical scheme has the following beneficial effects: the bus bar is provided with a main conductor and a transition conductor detachably assembled on the end of the main conductor through a bolt, so that when the insulating cover integrally cast on the outside of the transition conductor is damaged, the replacement of the insulating cover on the end of the bus bar is facilitated by detaching the transition conductor, compared with the replacement of the entire bus bar, the replacement is facilitated and the cost is reduced.

[0012] Further, at least one of the three-phase transition conductors is provided with a connecting sheet connected with the corresponding phase bus conductor, and the connecting sheet is clamped between the main conductor and the transition conductor in the corresponding phase bus conductor.

[0013] The above technical solution has the beneficial effects that: through clamping of the connecting sheet of the main conductor and the transition conductor to the connecting sheet of the corresponding phase transition conductor, the connection between the bus conductor and the corresponding phase transition conductor is facilitated, and at the same time, since there is no need to provide a connecting hole in the bus conductor, the probability of occurrence of the surface sharp discharge phenomenon of the bus conductor is also reduced, thereby ensuring the safety in use.

[0014] Further, the middle phase bus conductor is defined as the middle phase bus conductor in the three-phase bus conductor, and the edge phase bus conductor is defined as the edge phase bus conductor on both sides, the transition conductors corresponding to the edge phase bus conductors are provided with the connecting sheets, and the two connecting sheets are arranged at the longitudinal ends of the edge phase bus conductor; the transition conductor corresponding to the middle phase bus conductor is connected to one side of the middle phase bus conductor.

[0015] The above technical solution has the beneficial effects that: in this way, the connection between the edge phase bus conductor and the corresponding transition conductor is facilitated, the arrangement of the three-phase bus conductor and the three-phase transition conductor is facilitated, the insulation distance between the adjacent two transition conductors can be increased, the insulation effect is ensured, in addition, the length of the transition conductor connected with the edge phase bus conductor can be correspondingly reduced, the manufacturing cost is reduced, and the weight of the edge phase transition conductor is reduced.

[0016] Further, the side of the middle phase bus conductor is provided with a transition conductor penetration hole, and the transition conductor corresponding to the middle phase bus conductor penetrates into the transition conductor penetration hole and is fixedly connected through a bolt.

[0017] The above technical solution has the beneficial effects that: in this way, the connection between the middle phase bus conductor and the corresponding transition conductor is facilitated, and when the transition conductor corresponding to the middle phase bus conductor penetrates into the transition conductor penetration hole, the occurrence of the sharp discharge can be avoided, thereby ensuring the safety in use.

[0018] Further, the length of the middle phase bus conductor is less than the length of the edge phase bus conductor.

[0019] The above technical solution has the beneficial effects that: the length of the middle phase bus conductor is set to be less than the length of the edge phase bus conductor, which facilitates the connection between the edge phase bus conductor and the corresponding transition conductor, and at the same time, the insulation distance between the end portions of the adjacent two bus conductors can be increased, thereby ensuring the insulation effect.

[0020] Further, the cabinet body includes an air tank, the disconnecting switch and the bus conductor are arranged in the air tank, the voltage transformer and the lightning arrester are arranged below and outside the air tank, the upper end of the voltage transformer and the lightning arrester penetrates into the air tank and is connected with the bus conductor.

[0021] The technical scheme has the beneficial effects that: the disconnectors and the busbars are arranged in the gas tank, and the insulation between the disconnectors, the busbars and the cabinet can be ensured by the insulation gas in the gas tank; the voltage transformer and the lightning arrester with large size are arranged outside the gas tank, so that the volume of the gas tank can be reduced, the cost can be saved, and the use amount of the insulation gas can be reduced.

[0022] Further, each disconnector comprises a static contact, and a connecting conductor extending transversely is arranged on the static contact; the turning conductor is arranged on the connecting conductor; one end of the connecting conductor is connected with the static contact, and the other end of the connecting conductor is arranged on the cabinet through a supporting insulator.

[0023] The technical scheme has the beneficial effects that: the connecting conductor is arranged to facilitate the connection between the turning conductor and the disconnector, and the arrangement of the turning conductor is facilitated; the supporting insulator is arranged to not only realize the insulation connection between the connecting conductor and the cabinet, but also strengthen the strength of the connecting conductor by supporting the connecting conductor, so that the deformation of the connecting conductor caused by the electric power is avoided.

[0024] Further, the supporting insulator has a high-voltage end for being connected with the connecting conductor, and has a low-voltage end for being connected with the cabinet; the outer diameter of the high-voltage end is larger than the outer diameter of the low-voltage end.

[0025] The technical scheme has the beneficial effects that: the high-voltage end can be used to uniformly distribute the electric field, so that the influence of the electric field on the corresponding end of the connecting conductor is reduced, and the insulation performance between the connecting conductor and the cabinet is ensured; the outer diameter of the high-voltage end is set to be larger than the outer diameter of the low-voltage end, so that the weight of the supporting insulator can be reduced, the manufacturing material can be saved, and the cost can be reduced.

[0026] Further, the connecting conductor comprises an intermediate conductor and a switching conductor which are arranged in sequence along the axial direction and are connected by screws; the intermediate conductor is used to be connected with the static contact by screws, and the switching conductor is used to be connected with the supporting insulator by screws; the turning conductor is connected with the intermediate conductor.

[0027] The technical scheme has the beneficial effects that: the connecting conductor is arranged as the intermediate conductor and the switching conductor, so that the static contact can be connected by the intermediate conductor, and the connection between the connecting conductor and the supporting insulator is facilitated by the switching conductor. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a perspective view of the gas insulated PT cabinet in the application;

[0029] Figure 2 is a perspective view of part of the structure of the gas insulated PT cabinet in the application (the equipment chamber is not shown);

[0030] Figure 3 is the assembly diagram of each part in the cable chamber of the gas insulated PT cabinet of the present application;

[0031] Figure 4 is the connection relationship diagram between the intermediate static contact, the intermediate conductor, the transition conductor and the support insulator in the gas insulated PT cabinet of the present application;

[0032] Figure 5 is the partial enlarged view of Figure 4 ;

[0033] Figure 6 is the schematic diagram of the support insulator in the gas insulated PT cabinet of the present application;

[0034] Figure 7 is the schematic diagram of the assembly of the insulating cover and the transition conductor in the gas insulated PT cabinet of the present application;

[0035] Figure 8 is the schematic diagram of the first phase transition conductor in the gas insulated PT cabinet of the present application;

[0036] Figure 9 is the schematic diagram of the second phase transition conductor in the gas insulated PT cabinet of the present application.

[0037] In the figure: 10, cabinet body; 11, bus chamber; 12, cable chamber; 13, equipment chamber; 14, partition; 15, front door of the cabinet body; 16, rear door of the cabinet body; 17, maintenance access; 20, bus; 21, bus cone; 30, three-position switch; 31, isolation static contact; 32, moving contact; 33, intermediate static contact; 34, grounding contact; 35, transmission shaft; 40, intermediate conductor; 50, transition conductor; 51, first connecting section; 52, second connecting section; 60, support insulator; 61, first insert; 62, second insert; 70, fixed plate; 80, first phase transition conductor; 81, first connecting plate; 90, intermediate phase transition conductor; 100, first phase bus conductor; 101, first phase main conductor; 110, intermediate phase bus conductor; 111, intermediate phase main conductor; 120, insulating cover; 130, first outgoing line cone; 140, second outgoing line cone; 150, voltage transformer; 160, surge arrester; 170, second phase transition conductor; 171, second connecting plate; 180, second phase bus conductor; 181, second phase main conductor; 190, transition conductor. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and are not intended to limit the present application, i.e., the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0039] Therefore, the detailed description of the embodiments of the present application provided below in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without making creative efforts fall within the scope of the present application.

[0040] It should be noted that in the specific embodiments of the present application, the relationship terms such as "first" and "second" and the like that can appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between the entities or operations. Moreover, the terms such as "include", "contain" or any other variants that can appear are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. The limiting elements that can appear, such as "including a", do not exclude the presence of other identical elements in the process, method, article or device including the elements, without more limitations.

[0041] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" that can appear should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the description of the present application, unless otherwise explicitly specified and limited, the term "provided with" that can appear should be understood broadly, for example, the object "provided with" can be a part of the body, or arranged separately from the body and connected to the body, and the connection can be detachable connection, or non-detachable connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] The present invention will be further described in detail below with reference to the embodiments.

[0044] Example 1 of the gas-insulated PT cabinet in this invention:

[0045] like Figure 1 and Figure 2 As shown, the gas-insulated PT cabinet includes a cabinet body 10. Two partitions 14 are spaced vertically within the cabinet body 10, dividing the interior into a busbar compartment 11, a cable compartment 12, and an equipment compartment 13 arranged vertically. The busbar compartment 11 and cable compartment 12 are filled with insulating gas to form a gas chamber, while the equipment compartment 13 is located below and outside the gas chamber. The busbar compartment 11 contains three-phase busbars 20, arranged longitudinally along the depth of the cabinet body 10. Both ends of the three-phase busbars 20 are connected to the cabinet body 10 via busbar cones 21, and the three-phase busbars 20 can also be connected to external busbars 20 within the cabinet body 10 via their respective busbar cones 21.

[0046] like Figure 1 and Figure 2 As shown, the cable compartment 12 is equipped with three-phase disconnect switches located below the busbars 20 and corresponding one-to-one with the three-phase busbars 20. In this embodiment, all three-phase disconnect switches are three-position switches 30, and each three-position switch 30 is also arranged at intervals along the longitudinal direction. Figure 2 and Figure 3 As shown, each three-position switch 30 includes an isolating stationary contact 31, an intermediate stationary contact 33, and a grounding contact 34 arranged sequentially at intervals. It also includes a moving contact 32 located within the intermediate stationary contact 33 and slidingly engaging with it. The isolating stationary contact 31 is used to insert into the upper end of the moving contact 32, and it passes vertically through the partition 14 between the busbar compartment 11 and the cable compartment 12, and is connected to the corresponding phase busbar 20 via a conductor. The grounding contact 34 is also used to insert into the lower end of the moving contact 32, and it is connected to the cabinet 10 for grounding.

[0047] like Figure 4 As shown, a longitudinally extending drive shaft 35 is also provided in the cable compartment 12. The drive shaft 35 is connected to the three-phase moving contacts 32 respectively. The transmission method between the drive shaft 35 and the three-phase moving contacts 32 is a gear and rack transmission. Since the gear and rack transmission between the drive shaft 35 and the moving contacts 32 is prior art, it will not be repeated here. Specifically, the gear and rack transmission between the drive shaft and the moving contacts is disclosed in Chinese invention patent application with publication number CN111696819A.

[0048] like Figure 4 and Figure 5As shown, each intermediate static contact 33 is connected with a transversely extending connecting conductor through screw connection, the transverse direction is the width direction of the cabinet 10 and perpendicular to the longitudinal direction, and the connecting conductor comprises an intermediate conductor 40 and an adapter conductor 50 arranged in sequence along the axial direction and connected through screw connection. Among them, the intermediate conductor 40 is used for screw connection with the intermediate static contact 33, the adapter conductor 50 is in the shape of L as a whole, the adapter conductor 50 comprises a first connecting segment 51 extending in the same direction as the intermediate conductor 40, and a second extending segment perpendicular to the extending direction of the intermediate conductor 40, and the first extending segment and the intermediate conductor 40 are connected through screw connection.

[0049] As shown in Figures 1 to 6 , a support insulator 60 is arranged between each connecting conductor and the cabinet 10, the support insulator 60 is integrally cast by epoxy resin, one end of the support insulator 60 close to the connecting conductor is a high-voltage end, the first insert 61 is embedded and installed at the high-voltage end, the first insert 61 and the second connecting segment 52 of the adapter conductor 50 are connected through screw connection, so as to realize the connection between the adapter conductor 50 and the support insulator 60; one end of the support insulator 60 close to the cabinet 10 is a low-voltage end, the outer diameter of the low-voltage end is smaller than that of the high-voltage end, and the second insert 62 is embedded and installed at the low-voltage end, the second insert 62 and the fixing plate 70 on the cabinet 10 are connected through screw connection, so as to realize the connection between the cabinet 10 and the support insulator 60, and through the support insulator 60 connected between the adapter conductor 50 and the cabinet 10, not only the insulating connection between the connecting conductor and the cabinet 10 can be realized, but also the strength of the connecting conductor can be strengthened, so as to avoid the deformation of the connecting conductor due to the electric power, and further affect the coaxiality between the moving contact 32 and the isolation static contact 31, that is, the plug-in fit between the moving contact 32 and the isolation static contact 31 can be ensured.

[0050] As shown in Figure 2 , Figure 3 , and Figure 4 , the middle part of each intermediate conductor 40 is connected with a turning conductor corresponding to the three-phase intermediate conductor 40, specifically, the upper side of the middle part of each intermediate conductor 40 is provided with a countersunk hole extending in the radial direction thereof, a screw is installed in each countersunk hole, and the lower side of the middle part of each intermediate conductor 40 is provided with a turning conductor penetrating hole extending in the radial direction, the upper end of each turning conductor is inserted into the turning conductor penetrating hole of the corresponding phase intermediate conductor 40 and is threadedly connected with the screw in the corresponding countersunk hole. The lower end of each turning conductor away from the connecting conductor is connected with a longitudinally extending bus conductor, the three bus conductors correspond to the three-phase busbar 20 one by one, and the three bus conductors are arranged in the transverse direction.

[0051] As shown in Figure 4 , and Figure 7As shown, the busbar includes a main conductor and transition conductors 190 located at both axial ends of the main conductor, wherein an end of the transition conductor 190 away from the main conductor is integrally cast with an insulating cover 120 of epoxy resin material outside, both axial ends of the main conductor are provided with axially extending threaded holes, and the main conductor and the transition conductors 190 at both axial ends are detachably assembled through threaded connection of bolts and threaded holes. The insulating cover 120 and the transition conductor 190 are both provided with through holes for the bolts to pass through.

[0052] The middle-phase busbar 110 is defined as the middle-phase busbar in the three-phase busbar, the edge-phase busbar is defined as the busbar at both sides, and the length of the middle-phase busbar 110 is less than the length of the edge-phase busbar. The two edge-phase busbars are respectively a first edge-phase busbar 100 and a second edge-phase busbar 180, and the first edge-phase busbar 100 and the second edge-phase busbar 180 extend in opposite directions. The corresponding phase transition conductors corresponding to the first edge-phase busbar 100 and the second edge-phase busbar 180 are respectively a first edge-phase transition conductor 80 and a second edge-phase transition conductor 170, and the middle-phase transition conductor 90 is located between the first edge-phase transition conductor 80 and the second edge-phase transition conductor 170.

[0053] As shown in Figure 8 and Figure 9 , the lower ends of the first edge-phase transition conductor 80 and the second edge-phase transition conductor 170 are respectively provided with a first connecting sheet 81 and a second connecting sheet 171, wherein, as shown in Figure 4 , the first connecting sheet 81 is clamped between the first edge-phase main conductor 101 of the first edge-phase busbar 100 and the transition conductor 190, and the second connecting sheet 171 is clamped between the second edge-phase main conductor 181 of the second edge-phase busbar 180 and the transition conductor 190, so as to realize the connection between the edge-phase transition conductor and the corresponding edge-phase busbar, and the first connecting sheet 81 and the second connecting sheet 171 are respectively arranged at the longitudinal ends of the edge-phase busbar. The middle-phase transition conductor 90 and the corresponding middle-phase busbar 110 are connected to one side of the middle-phase busbar 110. Specifically, the upper side of the middle-phase main conductor 111 of the middle-phase busbar 110 is provided with a transition conductor penetration hole, the lower end of the middle-phase transition conductor 90 penetrates into the transition conductor penetration hole and is fixedly connected through a bolt.

[0054] As shown in Figure 1As shown, each bus conductor is provided with a first outgoing cone 130 and a second outgoing cone 140, each of which is mounted on the partition 14 between the cable chamber 12 and the equipment chamber 13 and connected with the main conductor of the corresponding bus conductor through a conductive rod, and the two outgoing cones corresponding to the same bus conductor are arranged in the extension direction of the bus conductor. The equipment chamber 13 is provided with a voltage transformer 150 and a lightning arrester 160 corresponding to each phase bus conductor, and the voltage transformers 150 and the lightning arresters 160 of the same phase are arranged in sequence along the bus conductor, and each voltage transformer 150 is connected with the first outgoing cone 130 of the corresponding phase through a conductor, and each lightning arrester 160 is connected with the second outgoing cone 140 of the corresponding phase.

[0055] In addition, it should be pointed out that the bus cone and the outgoing cone are both composed of a conductor and an insulating material wrapped outside the conductor, so that the conductive connection between two conductors can be realized through the bus cone or the outgoing cone.

[0056] The cabinet body 10 on the longitudinal two sides of the equipment chamber 13 is respectively provided with a cabinet rear door 16 and a cabinet front door 15, wherein the cabinet front door 15 is arranged close to the side of the lightning arrester 160, and the lightning arrester 160 in the cable chamber 12 can be maintained through the cabinet front door 15 and the maintenance passage 17 in the cable chamber 12. The cabinet rear door 16 is arranged close to the side of the voltage transformer 150, and the voltage transformer 150 in the equipment chamber 13 can be directly maintained by opening the cabinet rear door 16.

[0057] In the gas insulated PT cabinet of the present application, the three-phase bus conductors are arranged in transverse intervals, and the end portions of the bus conductors include insulating cover bodies, so that the insulation performance between the end portions of the bus conductors can be ensured through the insulating cover bodies, the discharge phenomenon between the end portions of the bus conductors is avoided, the transverse interval arrangement of the three-phase bus conductors meets the use requirements, and the transverse interval arrangement of the voltage transformers and the lightning arresters of each phase is also realized. When the voltage transformer or the lightning arrester is maintained, the maintenance of any voltage transformer or lightning arrester can be completed through the maintenance door on the longitudinal side, compared with the prior art, the voltage transformer or the lightning arrester of the adjacent phase does not need to be removed, time and energy are saved, and the maintenance is facilitated.

[0058] Embodiment 2 of the gas insulated PT cabinet in the present application:

[0059] The difference between this embodiment and embodiment 1 is that the disconnector in embodiment 1 is a three-position switch, while the disconnector in this embodiment is a two-position switch.

[0060] Embodiment 3 of the gas insulated PT cabinet in the present application:

[0061] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the busbar comprises a main conductor and transition conductors which are detachably assembled at two ends of the main conductor, and the insulating cover is integrally cast on the outside of the end of the transition conductor which is away from the main conductor. In the embodiment, the busbar is an integral piece, and the two ends of the busbar are integrally cast with the insulating cover respectively.

[0062] The embodiment 4 of the gas-insulated PT cabinet in the application:

[0063] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the first connecting sheet and the second connecting sheet are arranged at the longitudinal two ends of the busbar. In the embodiment, the first connecting sheet and the second connecting sheet are arranged at the same longitudinal end of the busbar.

[0064] The embodiment 5 of the gas-insulated PT cabinet in the application:

[0065] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the transition conductor corresponding to the busbar at the two sides is provided with a connecting sheet for connecting with the corresponding busbar, and the busbar at the middle is connected with the corresponding transition conductor through a screw. In the embodiment, the transition conductor corresponding to the busbar at the middle is provided with a connecting sheet for connecting with the corresponding busbar, and the busbar at the middle is connected with the corresponding transition conductor through a screw. In other embodiments, as long as one transition conductor is provided with a connecting sheet for connecting with the corresponding busbar, or each transition conductor is connected with the corresponding busbar through a screw.

[0066] The embodiment 6 of the gas-insulated PT cabinet in the application:

[0067] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the lower end of the transition conductor at the middle phase penetrates into the transition conductor penetration hole on the busbar at the middle phase and is fixedly connected through a bolt. In the embodiment, the transition conductor at the middle phase is directly connected with the outer side of the busbar at the middle phase through a bolt; or the transition conductor at the middle phase can be directly welded on the busbar at the middle phase.

[0068] The embodiment 7 of the gas-insulated PT cabinet in the application:

[0069] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the length of the busbar at the middle phase is less than the length of the busbar at the side phase. In the embodiment, the length of the busbar at the middle phase is greater than the length of the busbar at the side phase. In other embodiments, the length of the busbar at the middle phase is equal to the length of the busbar at the side phase.

[0070] The embodiment 8 of the gas-insulated PT cabinet in the application:

[0071] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the disconnecting switch and the bus conductor are arranged in the gas tank, that is, the insulation effect is ensured by the insulation gas in the gas tank, while in the embodiment, the voltage transformer and the arrester are arranged in the gas tank.

[0072] The embodiment 9 of the gas insulated PT cabinet in the application:

[0073] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the intermediate static contact is provided with a transversely extending connecting conductor, and the turning conductor is connected with the intermediate static contact by connecting with the connecting conductor, while in the embodiment, the turning conductor is directly connected with the intermediate static contact.

[0074] The embodiment 10 of the gas insulated PT cabinet in the application:

[0075] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the outer diameter of the high-voltage end is larger than that of the low-voltage end, while in the embodiment, the outer diameters of the high-voltage end and the low-voltage end of the supporting insulator are equal.

[0076] The embodiment 11 of the gas insulated PT cabinet in the application:

[0077] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the connecting conductor comprises the intermediate conductor and the turning conductor connected with each other, while in the embodiment, the connecting conductor is an integral piece.

[0078] The above is only the preferred embodiment of the application, and is not used to limit the application, the patent protection scope of the application is subject to the claims, any equivalent structural changes made by using the content of the specification and the drawings of the application should be included in the protection scope of the application.

Claims

1. A gas insulated PT cabinet, comprising a cabinet body, a three-phase busbar arranged in the cabinet body, the three-phase busbar being arranged in a longitudinal direction, the longitudinal direction being a cabinet depth direction of the cabinet body; three-phase disconnectors corresponding to the three-phase busbar one by one and arranged in the longitudinal direction below the three-phase busbar; and three-phase busbars corresponding to the three-phase disconnectors one by one and arranged in the longitudinal direction below the three-phase disconnectors in the cabinet body, the bottom of each busbar being provided with a voltage transformer and a lightning arrester, the voltage transformers and the lightning arresters of the same phase being arranged in sequence along the busbar; characterized in that, The three-phase busbars are arranged in transverse direction and extend in longitudinal direction, the transverse direction is the width direction of the cabinet and is perpendicular to the longitudinal direction, each phase busbar is connected with the corresponding disconnector through a turning conductor, each disconnector comprises a static contact, the static contact is provided with a transversely extending connecting conductor, the turning conductor is arranged on the connecting conductor, the turning conductors on the longitudinally arranged connecting conductors are connected with the three-phase busbars arranged in transverse direction in sequence, and the connecting positions of the turning conductors are the front section, the middle section and the rear section of the three-phase busbars in sequence, and the voltage transformers and the arresters connected on the busbars are aligned in the transverse direction; the end of the busbar is wrapped with an insulating cover.

2. The gas insulated PT cabinet according to claim 1, characterized in that, The busbar comprises a main conductor connected with the voltage transformer and the arrester, and a transition conductor detachably assembled on the end of the main conductor through a bolt, the insulating cover is integrally cast on the end of the transition conductor away from the main conductor, the end of the main conductor is provided with a threaded hole, and the insulating cover and the transition conductor are both provided with a through hole through which the bolt passes.

3. The gas insulated PT cabinet according to claim 2, characterized in that, At least one of the three-phase turning conductors is provided with a connecting piece connected with the corresponding phase busbar, and the connecting piece is clamped between the main conductor and the transition conductor of the corresponding phase busbar.

4. The gas insulated PT cabinet according to claim 3, characterized in that, The middle phase busbar is defined as the phase busbar located in the middle, and the side phase busbars are defined as the phase busbars located on both sides, the turning conductors corresponding to the side phase busbars are both provided with the connecting pieces, and the two connecting pieces are arranged at the longitudinal ends of the side phase busbars; the turning conductor corresponding to the middle phase busbar is connected to one side of the middle phase busbar.

5. The gas insulated PT cabinet according to claim 4, characterized in that, The side of the middle phase busbar is provided with a turning conductor insertion hole, and the turning conductor corresponding to the middle phase busbar is inserted into the turning conductor insertion hole and fixedly connected through a bolt.

6. The gas insulated PT cabinet according to claim 4 or 5, characterized in that, The length of the middle phase busbar is less than the length of the side phase busbar.

7. The gas-insulated PT cabinet according to any one of claims 1 to 5, characterized in that, The cabinet comprises an air tank, the disconnectors and the busbars are arranged in the air tank, and the voltage transformers and the arresters are arranged below the air tank, the upper ends of the voltage transformers and the arresters are inserted into the air tank and connected with the busbars.

8. The gas-insulated PT cabinet according to any one of claims 1 to 5, characterized in that, One end of the connecting conductor is connected with the static contact, and the other end is arranged on the cabinet through a supporting insulator.

9. The gas insulated PT cabinet according to claim 8, characterized in that, The supporting insulator has a high-voltage end for connecting with the connecting conductor, and a low-voltage end for connecting with the cabinet, and the outer diameter of the high-voltage end is greater than that of the low-voltage end.

10. The gas insulated PT cabinet according to claim 8, characterized in that, The connecting conductor comprises an intermediate conductor and a switching conductor arranged in sequence along the axial direction and connected through a screw, the intermediate conductor is used for connecting with the static contact through the screw, and the switching conductor is used for connecting with the supporting insulator through the screw; and the turning conductor is connected to the intermediate conductor.

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