Equipotential connection structure, switching apparatus including same, and method of manufacturing same
By adopting an equipotential bonding structure in high-voltage switchgear, the problem of floating potential of the rotating shaft under high rated voltage is solved, and equipotential bonding between the rotating shaft and the conduction arm is achieved, reducing the risk of discharge and making it suitable for a variety of switchgear.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-29
- Publication Date
- 2026-03-27
AI Technical Summary
In high-voltage switchgear, the rotating shaft may exhibit a floating potential under high rated voltage, leading to a risk of discharge.
An equipotential bonding structure is adopted, in which the rotating shaft is sleeved in an insulating sleeve, and the rotating shaft is electrically connected to the conducting arm using an equipotential bonding component, ensuring that the rotating shaft and the conducting arm remain at the same potential during rotation.
It effectively prevents the rotating shaft from discharging into the air under high voltage, reducing safety risks. It also has a simple structure, is cost-effective, and is suitable for various switchgear.
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Figure CN121753129A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the technical field of high-voltage power transmission. Specifically, this disclosure relates to an equipotential bonding structure for switching equipment, a switching equipment including the equipotential bonding structure, and a method for manufacturing the equipotential bonding structure. Background Technology
[0002] The main blade of a high-voltage switchgear (e.g., a pantograph disconnector) includes a first and a second conductive arm that are pivotally connected to each other via a rotating shaft, wherein the rotating shaft passes through a hole provided in each of the first and second conductive arms and is rotatably mounted into the hole via an insulating sleeve.
[0003] The drawback of this type of high-voltage switchgear is that when the main blades are subjected to high rated voltage, if the rotating shaft is not reliably connected to the conduction arm, a floating potential will appear in the rotating shaft, which may discharge into the air and create a safety risk. Summary of the Invention
[0004] In view of the above, this disclosure aims to provide an equipotential bonding structure for switching devices to overcome the aforementioned deficiencies in the prior art.
[0005] To this end, a first aspect of this disclosure provides an equipotential bonding structure for a switching device, the equipotential bonding structure including a first conductive arm and a second conductive arm pivotally connected to each other via a rotating shaft, wherein the rotating shaft passes through a first hole provided in the first conductive arm and is rotatably mounted into the first hole through a first insulating sleeve, and the rotating shaft passes through a second hole provided in the second conductive arm and is rotatably mounted into the second hole through a second insulating sleeve, and wherein the equipotential bonding structure further includes an equipotential bonding member, the equipotential bonding member including: a body sleeved on the rotating shaft and electrically connected to the rotating shaft; and at least one connecting leg extending from the body and abutting against the first conductive arm or the second conductive arm to allow the rotating shaft to be electrically connected to the first conductive arm or the second conductive arm.
[0006] According to this disclosure, the equipotential bonding member electrically connects the rotating shaft to one of the conductive arms to ensure that the rotating shaft and the conductive arms are at the same potential as they rotate relative to each other, thereby preventing floating potentials within the rotating shaft and avoiding safety risks caused by the rotating shaft discharging into the air.
[0007] According to a preferred embodiment of the present disclosure, the equipotential bonding member includes a plurality of connecting legs evenly distributed along its circumferential direction.
[0008] According to a preferred embodiment of this disclosure, the equipotential bonding member includes three connecting legs evenly distributed at 120° angular intervals.
[0009] According to a preferred embodiment of the present disclosure, the equipotential bonding structure further includes a first positioning pin and a second positioning pin, wherein the first positioning pin passes radially through the rotation shaft to allow the rotation shaft to be axially positioned relative to the first conductive arm, and the second positioning pin passes radially through the rotation shaft to allow the rotation shaft to be axially positioned relative to the second conductive arm, and wherein the equipotential bonding member is electrically connected to the first positioning pin or the second positioning pin.
[0010] According to a preferred embodiment of this disclosure, the body is sandwiched between the first positioning pin and the first insulating sleeve and electrically connected to the first positioning pin; or the body is sandwiched between the second positioning pin and the second insulating sleeve and electrically connected to the second positioning pin.
[0011] According to a preferred embodiment of the present disclosure, the body is sandwiched between the first locating pin and the first insulating sleeve by at least one washer and is electrically connected to the first locating pin via the washer; or the body is sandwiched between the second locating pin and the second insulating sleeve by at least one washer and is electrically connected to the second locating pin via the washer.
[0012] A second aspect of this disclosure provides a switching device including an equipotential bonding structure according to a first aspect of this disclosure.
[0013] A third aspect of this disclosure provides a method for manufacturing an equipotential bonding structure for a switching device, the method comprising: providing a first conductive arm and a second conductive arm, and pivotally connecting the first conductive arm to the second conductive arm via a rotating shaft, wherein the rotating shaft passes through a first hole in the first conductive arm and is rotatably mounted into the first hole via a first insulating sleeve, and the rotating shaft passes through a second hole in the second conductive arm and is rotatably mounted into the second hole via a second insulating sleeve; providing an equipotential bonding member including a body and at least one connecting leg extending from the body; and arranging the body to be sleeved on and electrically connected to the rotating shaft, and arranging the connecting leg to abut against the first conductive arm or the second conductive arm to allow the rotating shaft to be electrically connected to the first conductive arm or the second conductive arm.
[0014] According to a preferred embodiment of the present disclosure, the method further includes: arranging a first locating pin radially through the rotating shaft to allow the rotating shaft to be axially positioned relative to the first conductive arm; arranging a second locating pin radially through the rotating shaft to allow the rotating shaft to be axially positioned relative to the second conductive arm; and electrically connecting an equipotential bonding member to the first locating pin or the second locating pin.
[0015] According to a preferred embodiment of the present disclosure, the method further includes: arranging the body between the first locating pin and the first insulating sleeve via at least one washer and electrically connected to the first locating pin via the washer; or arranging the body between the second locating pin and the second insulating sleeve via at least one washer and electrically connected to the second locating pin via the washer.
[0016] The equipotential bonding structure according to this disclosure is simple, cost-effective, and easy to assemble, and therefore can be widely used in various types of switching devices.
[0017] Generally, all terms used in the claims will be interpreted according to their common meaning in the technical field, unless otherwise expressly defined herein. All references to “a / an / element, device, component, member, apparatus, step, etc.” will be publicly interpreted as referring to at least one instance of an element, device, component, member, apparatus, step, etc., unless otherwise expressly stated. Attached Figure Description
[0018] Other features and advantages of this disclosure will be better understood through the following preferred embodiments described in detail with reference to the accompanying drawings, wherein the same reference numerals indicate the same or similar parts.
[0019] Figure 1 A partial schematic diagram of a switching device in a first state according to one embodiment of the present disclosure is shown.
[0020] Figure 2 It shows Figure 1 The diagram shows a partial schematic of the switching device in its second state.
[0021] Figure 3 It shows Figure 1 The diagram shows an enlarged view of the equipotential bonding structure of the switching device in its first state.
[0022] Figure 4 It shows Figure 3 The enlarged view of the equipotential bonding structure shown is in the second state.
[0023] Figure 5 It shows Figure 3 The diagram shows a cross-sectional view of the equipotential bonding structure.
[0024] Figure 6 It shows Figure 3 An exploded view of the equipotential bonding structure shown.
[0025] Figure 7 It shows Figure 3 A perspective view of the equipotential bonding component of the equipotential bonding structure shown.
[0026] Figure 8 It shows Figure 3 The cross-sectional view of the equipotential bonding structure shown.
[0027] It should be noted that the accompanying drawings are not only used to explain and describe this disclosure, but also help to define this disclosure when necessary. Detailed Implementation
[0028] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are only intended to illustrate specific ways of implementing and using this disclosure, and are not intended to limit the scope of protection of this disclosure.
[0029] As a non-limiting example, the switching device according to this disclosure is a pantograph disconnector switch PD as shown in the accompanying drawings. Specifically, as Figure 1 and Figure 2 As shown, the main blades of the pantograph disconnector PD are supported by a supporting insulator 11 and include a first conductive arm 20 (i.e., the upper conductive arm) and a second conductive arm 30 (i.e., the lower conductive arm, which can be pivotally connected to the supporting insulator 11) that are pivotally connected to each other. Figure 1 In the disconnected state shown, the first conductive arm 20 and the second conductive arm 30 rotate to form a small angle therebetween, and the top movable contact or movable contact finger 22 of the first conductive arm 20 separates from the external fitting to disconnect the electrical connection. Figure 2 In the closed state shown, the first conductive arm 20 and the second conductive arm 30 rotate by driving the insulator 12 to form a large angle therebetween, and the top movable contact or movable contact finger 22 of the first conductive arm 20 contacts the external fitting to form an electrical connection.
[0030] like Figures 3 to 6 As shown, the first conductive arm 20 includes two first connecting blocks 21 positioned at its lower end, and the second conductive arm 30 includes two second connecting blocks 31 positioned at its upper end. A rotating shaft 50 passes through a first hole 211 in each of the first connecting blocks 21 and is rotatably mounted into the first hole 211 via a first insulating sleeve 61. Similarly, the rotating shaft 50 passes through a second hole 311 in each of the second connecting blocks 31 and is rotatably mounted into the second hole 311 via a second insulating sleeve 62, such that the first conductive arm 20 and the second conductive arm 30 can be pivotally connected to each other via the rotating shaft 50.
[0031] Furthermore, each of the first connecting blocks 21 is provided with a plurality of first connecting holes 212, and the first connecting plate 41 is mounted and electrically connected to each of the first connecting blocks 211 by a plurality of bolts 44 passing through the first connecting holes 212. Each of the second connecting blocks 31 is provided with a plurality of second connecting holes 312, and the second connecting plate 42 is mounted and electrically connected to each of the second connecting blocks 311 by a plurality of bolts 44 passing through the second connecting holes 312. The first connecting plate 41 and the second connecting plate 42 are electrically connected to each other by a flexible connecting piece (soft connection) 43, thereby electrically connecting the first conductive arm 20 and the second conductive arm 30 to each other. Figure 3 and Figure 4 As shown, when the first conductive arm 20 and the second conductive arm 30 rotate relative to each other between a closed state and an open state via a rotation shaft 50, the first conductive arm 20 and the second conductive arm 30 are arranged to maintain an electrical connection with each other by the bending deformation of the flexible connecting piece 43.
[0032] Since the rotating shaft 50 is separated from the first conductive arm 20 through the first insulating sleeve 61 and from the second conductive arm 30 through the second insulating sleeve 62, a floating potential will appear in the rotating shaft 50 when the main blade is subjected to a high rated voltage. As a result, the rotating shaft 50 may discharge into the air and create a safety risk.
[0033] Therefore, as Figures 6 to 8 As shown, the pantograph disconnector PD of this disclosure further includes an equipotential bonding member 90, which includes an annular body 91 and at least one connecting leg 92 extending from the outer edge of the body 91. The body 91 is fitted onto and electrically connected to the rotating shaft 50. At least one connecting leg 92 resiliently abuts against one of the first connecting blocks 21 of the first conductive arm 20 or one of the second connecting blocks 31 of the second conductive arm 30 to allow the rotating shaft 50 to be electrically connected to the first conductive arm 20 or the second conductive arm 30, thereby preventing floating potential within the rotating shaft 50. Preferably, the equipotential bonding member 90 includes a plurality of connecting legs 92 evenly distributed along its circumferential direction, for example, two to five connecting legs 92. In the illustrated embodiment, the equipotential bonding member 90 includes three connecting legs 92 evenly distributed at 120° angular intervals.
[0034] The detailed construction and assembly method of the equipotential bonding structure S of the pantograph disconnector PD are described below with the aid of Figures 6 to 8 Describe it.
[0035] like Figures 6 to 8 As shown, the equipotential bonding structure S includes a first positioning pin 71, a second positioning pin 72, a first washer 81, a second washer 82, and a third washer 83.
[0036] Each of the first locating pin 71 and the second locating pin 72 is, for example, a cotter pin. After the first guide arm 20 and the second guide arm 30 can be pivotally connected to each other via the rotating shaft 50, the first locating pin 71 is arranged to pass radially through a first through hole 51 provided in the rotating shaft 50 and protrude from the rotating shaft 50 to allow the rotating shaft 50 to be axially positioned relative to the first connecting block 21 of the first guide arm 20, and the second locating pin 72 is arranged to pass radially through a second through hole 52 provided in the rotating shaft 50 and protrude from the rotating shaft 50 to allow the rotating shaft 50 to be axially positioned relative to the second connecting block 31 of the second guide arm 30, thereby preventing the rotating shaft 50 from becoming loose from the first guide arm 20 and the second guide arm 30.
[0037] Specifically, the first washer 81 is arranged to be sleeved on the rotating shaft 50 and tightly clamped between the first locating pin 71 and the flange 611 of the first insulating sleeve 61. The second washer 82, the body 91 of the equipotential bonding member 90, and the third washer 83 are arranged sequentially to be sleeved on the rotating shaft 50 and tightly clamped between the flange 621 of the second insulating sleeve 62 and the second locating pin 72. This allows the body 91 to be electrically connected to the second locating pin 72 via the third washer 83, and allows the abutting end 921 of the connecting leg 92 of the equipotential bonding member 90 to abut against the second connecting block 31 of the second conductive arm 30 for electrical connection to the second conductive arm 30. Therefore, the second conductive arm 30, the equipotential bonding member 90, the third washer 83, the second locating pin 72, and the rotating shaft 50 are sequentially electrically connected, thereby preventing floating potential within the rotating shaft 50.
[0038] According to a variant not shown, the body 91 of the equipotential bonding member 90 can be arranged to be sandwiched between the first locating pin 71 and the flange 611 of the first insulating sleeve 61 by at least one washer and electrically connected to the first locating pin 71 via the washer. The abutting end 921 of the connecting leg 92 of the equipotential bonding member 90 can be arranged to abut against the first connecting block 21 of the first conductive arm 20 to be electrically connected to the first conductive arm 20, thereby electrically connecting the first conductive arm 20 to the rotating shaft 50 via the equipotential bonding member 90, thereby preventing floating potential from occurring in the rotating shaft 50.
[0039] In summary, the equipotential bonding structure S according to this disclosure is simple, cost-effective, and easy to assemble, and the switching equipment to which this equipotential bonding structure is applied is not limited to the pantograph disconnector PD shown. In fact, the equipotential bonding structure S according to this disclosure is suitable for application to any type of switching equipment comprising two conductive arms pivotally connected to each other via a rotating shaft having a floating potential.
[0040] The technical content and features of this disclosure have been disclosed above. However, it is conceivable that those skilled in the art can make various changes and improvements to the concepts disclosed above based on the inventive ideas of this disclosure, but all such changes and improvements fall within the protection scope of this disclosure. The description of the above embodiments is exemplary and not restrictive, and the protection scope of this disclosure is defined by the appended claims.
Claims
1. An equipotential bonding structure (S) for a switching device (PD), the equipotential bonding structure (S) comprising a first conductive arm (20) and a second conductive arm (30) pivotally connected to each other via a rotation shaft (50), wherein, The rotating shaft (50) passes through the first hole (211) in the first conductive arm (20) and is rotatably installed in the first hole (211) through the first insulating sleeve (61). The rotating shaft (50) also passes through the second hole (311) in the second conductive arm (30) and is rotatably installed in the second hole (311) through the second insulating sleeve (62). The equipotential bonding structure (S) further includes an equipotential bonding member (90), which comprises: Body (91), said body (91) being sleeved on the rotating shaft (50) and electrically connected to the rotating shaft (50); and At least one connecting leg (92) extends from the body (91) and abuts against the first conductive arm (20) or the second conductive arm (30) to allow the rotating shaft (50) to be electrically connected to the first conductive arm (20) or the second conductive arm (30).
2. The equipotential bonding structure (S) according to claim 1, wherein, The equipotential bonding member (90) includes a plurality of connecting legs (92) evenly distributed along the circumferential direction of the equipotential bonding member (90).
3. The equipotential bonding structure (S) according to claim 2, wherein, The equipotential bonding member (90) includes three connecting legs (92) evenly distributed at 120° angular intervals.
4. The equipotential bonding structure (S) according to any one of claims 1 to 3, wherein, The equipotential bonding structure (S) further includes a first positioning pin (71) and a second positioning pin (72), wherein the first positioning pin (71) passes radially through the rotating shaft (50) to allow the rotating shaft (50) to be axially positioned relative to the first conductive arm (20), and the second positioning pin (72) passes radially through the rotating shaft (50) to allow the rotating shaft (50) to be axially positioned relative to the second conductive arm (30), and wherein the equipotential bonding member (90) is electrically connected to the first positioning pin (71) or the second positioning pin (72).
5. The equipotential bonding structure (S) according to claim 4, wherein, The body (91) is sandwiched between the first positioning pin (71) and the first insulating sleeve (61) and electrically connected to the first positioning pin (71); or the body (91) is sandwiched between the second positioning pin (72) and the second insulating sleeve (62) and electrically connected to the second positioning pin (72).
6. The equipotential bonding structure (S) according to claim 5, wherein, The body (91) is sandwiched between the first positioning pin (71) and the first insulating sleeve (61) by at least one washer and is electrically connected to the first positioning pin (71) via the washer; or the body (91) is sandwiched between the second positioning pin (72) and the second insulating sleeve (62) by at least one washer and is electrically connected to the second positioning pin (72) via the washer.
7. A switching device (PD) comprising an equipotential bonding structure (S) according to any one of claims 1 to 6.
8. A method for manufacturing an equipotential bonding structure (S) for a switching device (PD), the method comprising: A first conductive arm (20) and a second conductive arm (30) are provided, and the first conductive arm (20) is pivotally connected to the second conductive arm (30) via a rotating shaft (50), wherein the rotating shaft (50) passes through a first hole (211) provided in the first conductive arm (20) and is rotatably installed in the first hole (211) via a first insulating sleeve (61), and the rotating shaft (50) passes through a second hole (311) provided in the second conductive arm (30) and is rotatably installed in the second hole (311) via a second insulating sleeve (62). The method further includes: An equipotential bonding member (90) is provided, the equipotential bonding member (90) comprising a body (91) and at least one connecting leg (92) extending from the body (91); and The body (91) is arranged to be sleeved on the rotating shaft (50) and electrically connected to the rotating shaft (50), and the connecting leg (92) is arranged to abut against the first conductive arm (20) or the second conductive arm (30) to allow the rotating shaft (50) to be electrically connected to the first conductive arm (20) or the second conductive arm (30).
9. The method according to claim 8, wherein, The method further includes: arranging a first locating pin (71) radially through the rotating shaft (50) to allow the rotating shaft (50) to be axially positioned relative to the first conductive arm (20); arranging a second locating pin (72) radially through the rotating shaft (50) to allow the rotating shaft (50) to be axially positioned relative to the second conductive arm (30); and electrically connecting the equipotential bonding member (90) to the first locating pin (71) or the second locating pin (72).
10. The method according to claim 8, wherein, The method further includes: arranging the body (91) between the first locating pin (71) and the first insulating sleeve (61) by means of at least one washer and electrically connected to the first locating pin (71) via the washer; or arranging the body (91) between the second locating pin (72) and the second insulating sleeve (62) by means of at least one washer and electrically connected to the second locating pin (72) via the washer.