Isolating switch and switch cabinet

Abstract

The invention belongs to the technical field of electrical equipment, and discloses an isolating switch and a switch cabinet. The isolating switch is arranged on a cabinet body of the switch cabinet and comprises an operating straight rod, a conducting rod and a transmission assembly, the operating straight rod penetrates through the cabinet body in a sliding mode, the conducting rod is arranged in an inner cone of a voltage transformer located in the cabinet body in a sliding mode, and the transmission assembly is connected with the operating straight rod and the conducting rod. The straight rod is operated to move to drive the conducting rod to move through the transmission assembly, so that the first end of the conducting rod is communicated with the busbar for switching on or the second end of the conducting rod is communicated with the grounding bar for switching off. When the operating straight rod is pushed and pulled and moves, the conducting rod is driven by the transmission assembly to move, so that the conducting rod is communicated with the bus bar to realize switching on or is communicated with the grounding bar to realize switching off, a direct-acting mode is adopted to replace an existing wrench mode, the overall structure is flatter, the required operation space is smaller, the overall structure is simplified, the number of used parts is reduced, and the cost is reduced. Therefore, the occupied space is reduced, and the assembling time is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an isolating switch and a switch cabinet. Background Art

[0002] Voltage transformer (PT) is a commonly used component in switchgear. Voltage transformer can convert the voltage in high voltage system into the voltage in low voltage system for measurement and monitoring. During maintenance and overhaul, it is necessary to control the on and off of busbar and voltage transformer, that is, when voltage transformer is needed, connect the voltage transformer to the main busbar, and when voltage transformer is not needed, cut off the connection between voltage transformer and main busbar.

[0003] In the prior art, an isolating knife (PT knife) is usually provided to isolate the voltage transformer from the power system. The isolating knife is operated in the form of a "wrench" to drive the isolating blade in the switch cabinet to achieve opening and closing by turning the wrench. A large operating space needs to be reserved, and the overall space occupied is large, the number of parts is large, and the assembly time is long.

[0004] That is, the existing isolating knife in the form of a "wrench" has the disadvantages of occupying a large space for the overall structure, having many parts, and taking a long time to assemble. Summary of the invention

[0005] The object of the present invention is to provide an isolating switch and a switch cabinet to solve the problems of the existing "wrench" type isolating knife, such as large overall structure space occupation, many parts and long assembly time.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The present invention provides an isolating switch, which is used to be arranged on a cabinet of a switch cabinet, wherein a busbar and a grounding bar are arranged in the cabinet, and the isolating switch comprises:

[0008] An operating straight rod, the operating straight rod is slidably arranged on the cabinet body;

[0009] A conductive rod, slidably disposed in an inner cone of a voltage transformer located in the cabinet;

[0010] A transmission assembly is located in the cabinet, and the transmission assembly connects the operating straight rod and the conductive rod. The operating straight rod moves through the transmission assembly to drive the conductive rod to move, so that the first end of the conductive rod is connected to the busbar to close the switch or the second end of the conductive rod is connected to the grounding bar to open the switch.

[0011] As an optional technical solution for an isolating switch, the transmission assembly includes:

[0012] A base, used for being fixed on the cabinet;

[0013] A swing rod is rotatably arranged on the base, wherein a first end of the swing rod is hinged to the operating straight rod and a second end is slidably connected to the conductive rod. Movement of the operating straight rod drives the swing rod to rotate, thereby pulling the conductive rod to move.

[0014] As an optional technical solution of the isolating switch, three conductive rods are provided, the swing rods are provided in one-to-one correspondence with the conductive rods, the transmission assembly further includes a rotating shaft, each of the swing rods is fixedly connected to the rotating shaft and is rotatably provided on the base through the rotating shaft;

[0015] The operating straight rod is connected to the first swing rod to drive the first swing rod and the rotating shaft to rotate, and the rotation of the rotating shaft drives the remaining swing rods to rotate.

[0016] As an optional technical solution for an isolating switch, it also includes a fastener, a slide groove is provided on the conductive rod, the conductive rod is connected to the inner cone of the voltage transformer through the fastener, and the fastener is slidably arranged in the slide groove.

[0017] As an optional technical solution for the isolating switch, it also includes a first elastic member, which is arranged between the fastener and the conductive rod, so that the conductive rod is in contact with the inner cone of the voltage transformer.

[0018] As an optional technical solution for an isolating switch, at least two fasteners are provided, and the two fasteners are arranged side by side and spaced apart along the moving direction of the conductive rod.

[0019] As an optional technical solution for the isolating switch, it also includes a second elastic member, and each of the two ends of the conductive rod is provided with a second elastic member, and the second elastic member is located between the conductive rod and the bus bar or the grounding bar.

[0020] As an optional technical solution for the isolating switch, a mounting groove is provided at the end of the conductive rod, and the second elastic member is at least partially disposed in the mounting groove and fixed to the bottom of the mounting groove.

[0021] As an optional technical solution for an isolating switch, it also includes a sealing structure, in which the operating straight rod is slidably inserted, and the sealing structure is used to be embedded and fixed on the cabinet.

[0022] The present invention provides a switch cabinet, comprising a cabinet body, a busbar, a grounding bar, an inner cone of a voltage transformer and the above-mentioned isolating switch.

[0023] Beneficial effects:

[0024] The present invention provides an isolating switch, which is used to be arranged on a cabinet of a switch cabinet, wherein a busbar and a grounding bar are arranged in the cabinet, and the isolating switch comprises an operating straight rod, a conductive rod and a transmission assembly, wherein the operating straight rod is slidably arranged on the cabinet, and the conductive rod is slidably arranged on an inner cone of a voltage transformer located in the cabinet, and the transmission assembly is located in the cabinet, and the transmission assembly connects the operating straight rod and the conductive rod, and the operating straight rod moves to drive the conductive rod to move through the transmission assembly, so that the first end of the conductive rod is connected to the busbar to close the switch or the second end of the conductive rod is connected to the grounding bar to open the switch. By sliding the operating straight rod through the cabinet, and sliding the conductive rod on the inner cone of the voltage transformer, and using the push-pull operating straight rod, when the operating straight rod moves, the conductive rod is driven to move through the transmission assembly, so that the conductive rod is connected to the busbar to close the switch or connected to the grounding bar to open the switch, the "direct-acting type" is adopted to replace the existing "wrench type", the overall structure is flatter, the required operating space is smaller, the overall structure is simplified, and the used parts are reduced, thereby reducing the occupied space, and helping to save assembly time.

[0025] The present invention provides a switch cabinet, which includes a cabinet body, a busbar, a grounding bar, an inner cone of a voltage transformer and the above-mentioned isolating switch. By arranging the switch cabinet with the isolating switch, the on and off of the busbar and the voltage transformer can be controlled, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the isolating switch in the closed state provided by an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of an isolating switch in an open state provided by an embodiment of the present invention;

[0028] Figure 3 is a cross-sectional view of an isolating switch provided by an embodiment of the present invention;

[0029] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0030] Figure 5 is a structural schematic diagram of a switch cabinet provided by an embodiment of the present invention from a first perspective;

[0031] Figure 6 is a structural schematic diagram of a switch cabinet provided by an embodiment of the present invention from a second viewing angle;

[0032] Figure 7 is a structural schematic diagram of a switch cabinet provided by an embodiment of the present invention from a third viewing angle;

[0033] Figure 8 It is a partial structural schematic diagram of an isolating switch provided in an embodiment of the present invention.

[0034] In the figure:

[0035] 11. operating straight rod; 12. transmission assembly; 121. base; 122. swing rod; 123. rotating shaft; 13. conductive rod; 131. slide groove; 132. mounting groove; 14. fastener; 15. first elastic member; 16. second elastic member; 17. sealing structure; 18. retaining spring;

[0036] 20. Cabinet; 21. Busbar; 22. Grounding bar; 23. Inner cone of voltage transformer. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figures 1 to 4As shown, this embodiment provides a disconnector and a switch cabinet, the switch cabinet comprising a cabinet 20, a bus bar 21, a grounding bar 22, a voltage transformer inner cone 23 and a disconnector. The disconnector is used to be arranged on the cabinet 20 of the switch cabinet, the cabinet 20 is provided with a bus bar 21 and a grounding bar 22, the disconnector comprises an operating straight rod 11, a conductive rod 13 and a transmission assembly 12, the operating straight rod 11 is slidably arranged on the cabinet 20, the conductive rod 13 is slidably arranged on the voltage transformer inner cone 23 located in the cabinet 20, the transmission assembly 12 is located in the cabinet 20, the transmission assembly 12 connects the operating straight rod 11 and the conductive rod 13, the operating straight rod 11 moves through the transmission assembly 12 to drive the conductive rod 13 to move, so that the first end of the conductive rod 13 is connected to the bus bar 21 to close the switch or the second end of the conductive rod 13 is connected to the grounding bar 22 to open the switch.

[0042] By setting a switch cabinet with an isolating switch, when a voltage transformer is needed, the inner cone 23 of the voltage transformer is connected to the bus bar 21 through the conductive rod 13, and when a voltage transformer is not needed, the inner cone 23 of the voltage transformer is disconnected from the bus bar 21 and connected to the grounding bar 22 through the conductive rod 13, thereby controlling the on and off of the bus bar 21 and the voltage transformer, thereby improving safety. By sliding the operating straight rod 11 through the cabinet 20, and sliding the conductive rod 13 on the inner cone 23 of the voltage transformer, the straight rod 11 is pushed and pulled, and when the operating straight rod 11 moves, the conductive rod 13 is driven to move through the transmission assembly 12, so that the conductive rod 13 is connected to the bus bar 21 to achieve closing or connected to the grounding bar 22 to achieve opening, and the "direct-acting type" is used instead of the existing "wrench type", the overall structure is flatter, the required operating space is smaller, the overall structure is simplified, and the used parts are reduced, thereby reducing the occupied space and helping to save assembly time.

[0043] Specifically, the axes of the operating rod 11 and the conductive rod 13 are parallel; one end of the operating rod 11 is located inside the cabinet 20 and connected to the transmission assembly 12, and the other end of the operating rod 11 extends outside the cabinet 20. During operation, the operating rod 11 is pushed and pulled along the axis of the operating rod 11 outside the cabinet 20, and the conductive rod 13 can be driven to move through the transmission assembly 12, thereby achieving closing or opening of the switch.

[0044] Furthermore, the isolating switch further includes a sealing structure 17, in which the operating rod 11 is slidably inserted, and the sealing structure 17 is used to be embedded and fixed on the cabinet 20. By arranging the sealing structure 17 to be embedded and fixed on the cabinet 20, it is helpful to ensure the sealing of the cabinet 20. In this embodiment, the sealing structure 17 is annular and is a dynamic seal, which means that the sealing can be achieved when the operating rod 11 is in a moving state. The specific structure and material used for the dynamic seal can be set with reference to the prior art.

[0045] Furthermore, the transmission assembly 12 includes a base 121 and a swing rod 122. The base 121 is used to be fixed on the cabinet 20. The swing rod 122 is rotatably set on the base 121. The first end of the swing rod 122 is hinged to the operating straight rod 11. The second end of the swing rod 122 is slidably connected to the conductive rod 13. The movement of the operating straight rod 11 drives the swing rod 122 to rotate, thereby pulling the conductive rod 13 to move.

[0046] By setting a base 121 and a swing rod 122, the swing rod 122 is rotatably set on the base 121, and the swing rod 122 is used to transmit force between the operating straight rod 11 and the conductive rod 13. When the operating straight rod 11 moves, the swing rod 122 is driven to rotate. The structure is simple and compact, the installation is convenient, the transmission is stable and the efficiency is high.

[0047] See also Figures 5 to 8 There are three conductive rods 13, and the swing rods 122 are arranged in a one-to-one correspondence with the conductive rods 13. The transmission assembly 12 also includes a rotating shaft 123. Each swing rod 122 is fixedly connected to the rotating shaft 123 and is rotatably arranged on the base 121 through the rotating shaft 123; the operating straight rod 11 is connected to the first swing rod 122 to drive the first swing rod 122 and the rotating shaft 123 to rotate, and the rotation of the rotating shaft 123 drives the remaining swing rods 122 to rotate.

[0048] Three conductive rods 13 and corresponding swing rods 122 are arranged to correspond to the three-phase circuit. A rotating shaft 123 is rotatably arranged on the base 121. Each swing rod 122 is fixed on the rotating shaft 123. The operating straight rod 11 is connected to the first swing rod 122. When the operating straight rod 11 moves, the first swing rod 122 and the rotating shaft 123 are driven to rotate synchronously, and the rotating shaft 123 drives the remaining swing rods 122 to rotate, thereby realizing the three-phase synchronous opening and closing action, which is helpful to connect or disconnect the circuit at the same time, protect the voltage transformer, and avoid current dislocation or voltage imbalance.

[0049] In this embodiment, two bases 121 are provided, and both ends of the rotating shaft 123 are rotatably provided on one base 121; the swing rod 122 and the rotating shaft 123 are both made of insulating material; two or three conductive rods 13 are arranged side by side at intervals, and the three swing rods 122 are arranged side by side at intervals and fixed on the rotating shaft 123. The swing rod 122 located in the middle position among the three swing rods 122 is the first swing rod 122, and the operating straight rod 11 is hinged to the end of the first swing rod 122; the extension direction of the rotating shaft 123 intersects with the extension direction of the conductive rod 13; the cross-sectional profile shape of the middle part of the rotating shaft 123 is a regular hexagonal deformation. In other embodiments, the cross-sectional profile shape of the middle part of the rotating shaft 123 can also be a triangle or a quadrilateral.

[0050] Specifically, three groups of mounting through holes are provided on the rotating shaft 123 for passing through limit members, each group includes two mounting through holes, and each swing rod 122 is located between the two mounting through holes in the same group; the limit member is passed through the mounting through hole and both ends extend outside the mounting through hole, and the two limit members respectively stop the swing rod 122 from both sides to prevent relative movement between the swing rod 122 and the rotating shaft 123.

[0051] See also Figure 8 Optionally, the operating straight rod 11 and the first end of the swing rod 122 are hinged through a connecting piece, and a retaining spring 18 is provided at the hinge, and the retaining spring 18 is sleeved on the connecting piece for fixing and limiting the axial movement of the connecting piece; the connecting piece can be a connecting pin.

[0052] In this embodiment, a waist-shaped hole is provided at the second end of the swing rod 122, and the conductive rod 13 is connected to the second end of the swing rod 122 through a fixing member, and the fixing member is inserted into the waist-shaped hole and can slide in the waist-shaped hole; the fixing member can be a positioning pin. In other embodiments, a cylindrical protrusion can also be provided on the conductive rod 13, and the cylindrical protrusion can be inserted into the waist-shaped hole and slide in the waist-shaped hole.

[0053] See also Figure 4 and Figure 5 Further, the disconnector further includes a fastener 14, a slide groove 131 is provided on the conductive rod 13, the conductive rod 13 is connected to the inner cone 23 of the voltage transformer through the fastener 14, and the fastener 14 is slidably arranged in the slide groove 131. By arranging the fastener 14, the conductive rod 13 is connected to the inner cone 23 of the voltage transformer through the fastener 14, and when the conductive rod 13 moves, the fastener 14 slides in the slide groove 131, which can not only ensure that the conductive rod 13 is connected to the inner cone 23 of the voltage transformer, but also realize the opening and closing operation by using the movement of the conductive rod 13.

[0054] Optionally, the disconnector further comprises a first elastic member 15, which is disposed between the fastener 14 and the conductive rod 13, so that the conductive rod 13 contacts the inner cone 23 of the voltage transformer. By disposing the first elastic member 15 and compressing the first elastic member 15 with the fastener 14, the elastic force is used to ensure that the conductive rod 13 and the inner cone 23 of the voltage transformer maintain contact and conduction.

[0055] In this embodiment, an auxiliary sleeve is inserted into the conductive rod 13, the first elastic member 15 is arranged between the auxiliary sleeve and the fastener 14, the first elastic member 15 is sleeved outside the auxiliary sleeve, one end of the fastener 14 presses against the first elastic member 15 and the other end passes through the auxiliary sleeve and is fixed on the inner cone 23 of the voltage transformer.

[0056] Optionally, at least two fasteners 14 are provided, and the two fasteners 14 are arranged side by side and spaced apart along the moving direction of the conductive rod 13. By providing two fasteners 14, the two fasteners 14 are spaced apart along the moving direction of the conductive rod 13, which neither affects the movement of the conductive rod 13 nor helps to ensure the stability of the connection between the conductive rod 13 and the inner cone 23 of the voltage transformer. In this embodiment, the conductive rod 13 moves along its own axial direction, the slide groove 131 is provided in the middle of the conductive rod 13, and the axial direction of the conductive rod 13 is the length direction of the slide groove 131.

[0057] Furthermore, the isolating switch further includes a second elastic member 16, and a second elastic member 16 is provided at both ends of the conductive rod 13, and the second elastic member 16 is located between the conductive rod 13 and the bus bar 21 or the grounding bar 22. By providing the second elastic member 16, the conductive rod 13 and the bus bar 21 or the grounding bar 22 can be in contact and connected through the second elastic member 16, thereby preventing the manual operation of the straight rod 11 from being out of place and thus affecting the normal operation of the isolating switch.

[0058] Optionally, a mounting groove 132 is provided at the end of the conductive rod 13, and the second elastic member 16 is at least partially disposed in the mounting groove 132 and fixed to the bottom of the mounting groove 132. The mounting groove 132 provided on the conductive rod 13 can not only accommodate the second elastic member 16, but also limit the second elastic member 16, thereby preventing the second elastic member 16 from deforming in an uncontrolled and unexpected direction when it is extended or retracted.

[0059] In this embodiment, the first elastic member 15 and the second elastic member 16 are both springs; the end of the second elastic member 16 is fixed to the bottom of the mounting slot 132 of the conductive rod 13 by screws. In other embodiments, the second elastic member 16 can also be fixed by welding or clamping.

[0060] See also Figure 1 and Figure 2 The following is the specific use process of the isolating switch (taking the horizontal push-pull operation straight rod 11 as an example):

[0061] When opening the circuit breaker, push the operating rod 11 from left to right, the operating rod 11 moves to the right, drives the swing rod 122 to rotate counterclockwise by a certain angle, and the swing rod 122 pulls the conductive rod 13 to move to the left, and the first end of the conductive rod 13 gradually moves away from the busbar 21 until the second end of the conductive rod 13 contacts and connects with the grounding bar 22, thus achieving opening the circuit breaker. Figure 2 At this time, in the open state, the central axis of the swing rod 122 forms an angle θ with the vertical direction; in this embodiment, the angle θ is 15 degrees.

[0062] When closing the circuit breaker, pull the operating rod 11 to the left, and the operating rod 11 moves to the left, driving the swing rod 122 to rotate clockwise by a certain angle. The swing rod 122 pushes the conductive rod 13 to move to the right, and the second end of the conductive rod 13 gradually moves away from the grounding bar 22 until the first end of the conductive rod 13 contacts and connects with the busbar 21, thereby achieving closing the circuit breaker.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Isolating switch, characterized in that: The isolating switch is used to be arranged on a cabinet body (20) of a switch cabinet, wherein a busbar (21) and a grounding bar (22) are arranged in the cabinet body (20), and the isolating switch comprises: An operating straight rod (11), the operating straight rod (11) being slidably disposed on the cabinet (20); A conductive rod (13) slidably disposed in an inner cone (23) of a voltage transformer located in the cabinet (20); A transmission assembly (12) is located in the cabinet (20), and the transmission assembly (12) is connected to the operating straight rod (11) and the conductive rod (13). The operating straight rod (11) moves through the transmission assembly (12) to drive the conductive rod (13) to move, so that the first end of the conductive rod (13) is connected to the busbar (21) to close the switch, or the second end of the conductive rod (13) is connected to the grounding bar (22) to open the switch.

2. The isolating switch according to claim 1, characterized in that: The transmission assembly (12) comprises: A base (121) used for being fixed on the cabinet (20); A swing rod (122) is rotatably disposed on the base (121); a first end of the swing rod (122) is hinged to the operating straight rod (11) and a second end is slidably connected to the conductive rod (13); movement of the operating straight rod (11) drives the swing rod (122) to rotate, thereby pulling the conductive rod (13) to move.

3. The isolating switch according to claim 2, characterized in that: The conductive rods (13) are provided with three, the swing rods (122) are provided in one-to-one correspondence with the conductive rods (13), the transmission assembly (12) further comprises a rotating shaft (123), each of the swing rods (122) is fixedly connected to the rotating shaft (123) and is rotatably provided on the base (121) through the rotating shaft (123); The operating straight rod (11) is connected to the first swing rod (122) to drive the first swing rod (122) and the rotating shaft (123) to rotate, and the rotation of the rotating shaft (123) drives the remaining swing rods (122) to rotate.

4. The isolating switch according to claim 1, characterized in that: It also includes a fastener (14), a slide groove (131) is provided on the conductive rod (13), the conductive rod (13) is connected to the inner cone (23) of the voltage transformer through the fastener (14), and the fastener (14) is slidably arranged in the slide groove (131).

5. The isolating switch according to claim 4, characterized in that: It also comprises a first elastic member (15), wherein the first elastic member (15) is arranged between the fastener (14) and the conductive rod (13), so that the conductive rod (13) is in contact with the inner cone (23) of the voltage transformer.

6. The isolating switch according to claim 4, characterized in that: At least two fasteners (14) are provided, and the two fasteners (14) are arranged side by side and spaced apart along the moving direction of the conductive rod (13).

7. The isolating switch according to any one of claims 1 to 6, characterized in that: It also includes a second elastic member (16), each of the two ends of the conductive rod (13) being provided with a second elastic member (16), and the second elastic member (16) is located between the conductive rod (13) and the busbar (21) or the grounding bar (22).

8. The isolating switch according to claim 7, characterized in that: The end of the conductive rod (13) is provided with a mounting groove (132), and the second elastic member (16) is at least partially disposed in the mounting groove (132) and fixed to the bottom of the mounting groove (132).

9. The isolating switch according to any one of claims 1 to 6, characterized in that: It also includes a sealing structure (17), wherein the operating straight rod (11) is slidably inserted into the sealing structure (17), and the sealing structure (17) is used to be embedded and fixed on the cabinet (20).

10. A switch cabinet, characterized in that: It comprises a cabinet (20), a busbar (21), a grounding bar (22), an inner cone of a voltage transformer (23), and an isolating switch as claimed in any one of claims 1 to 9.

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