Equipotential connection structure, switchgear device comprising the same, and method for manufacturing the same

Abstract

The present disclosure relates to an equipotential connection structure for a switchgear device, a switchgear device comprising the same, and a method for manufacturing the same. The equipotential connection structure comprises a first conductive arm (20) and a second conductive arm (30) pivotably connected to each other by a rotation shaft (50), wherein the rotation shaft (50) passes through and is rotatably mounted into a first hole (211) provided in the first conductive arm (20) by a first insulated sleeve (61), and passes through and is rotatably mounted into a second hole (311) provided in the second conductive arm (30) by a second insulated sleeve (62), and wherein the equipotential connection structure (S) further comprises an equipotential connection member (90) comprising: a body (91) sleeved on the rotation shaft (50) and electrically connected to the rotation shaft (50); and at least one connection leg (92) extending from the body (91) and abutting against the first conductive arm (20) or the second conductive arm (30) to allow the rotation shaft (50) to be electrically connected to the first conductive arm (20) or the second conductive arm (30).

Description

EQUIPOTENTIAL CONNECTION STRUCTURE, SWITCHGEAR DEVICECOMPRISING THE SAME, AND METHOD FOR MANUFACTURING THE SAMETECHNICAL FIELD

[0001] The present disclosure relates to the technical field of high-voltage power transmission. Specifically, the present disclosure relates to an equipotential connection structure for a switchgear device, a switchgear device comprising the same, and a method for manufacturing the same.BACKGROUND

[0002] A main blade of a kind of high-voltage switchgear device, for example, a pantograph disconnector, comprises a first conductive arm and a second conductive arm pivotably connected to each other by a rotation shaft, wherein the rotation shaft passes through and is rotatably mounted into an hole provided in each of the first conductive arm and the second conductive arm by an insulated sleeve.

[0003] The defect of this type of high-voltage switchgear device lies in that, when the main blade is subjected to a high rated voltage, if the rotation shaft is not reliably connected to the conductive arms, a floating potential will occur in the rotation shaft, whereby the rotating shaft may discharge into the air and create a safety risk.SUMMARY

[0004] In view of the above, the present disclosure aims to provide an equipotential connection structure for a switchgear device so as to overcome the above-mentioned defect in the prior art.

[0005] To this end, a first aspect of the present disclosure provides an equipotential connection structure for a switchgear device, comprising a first conductive arm and a second conductive arm pivotably connected to each other by a rotation shaft, wherein the rotation shaft passes through and is rotatably mounted into a first hole provided in the first conductive arm by a first insulated sleeve, and the rotation shaft passes through and is rotatably mounted into a second hole provided in the second conductive arm by a second insulated sleeve, and wherein the equipotential connection structure further comprises an equipotential connectionmember comprising: a body sleeved on the rotation shaft and electrically connected to the rotation shaft; and at least one connection leg extending from the body and abutting against the first conductive arm or the second conductive arm to allow the rotation shaft to be electrically connected to the first conductive arm or the second conductive arm.

[0006] According to the present disclosure, the equipotential connection member electrically connects the rotation shaft to one of the conductive arms, so as to ensure that the rotation shaft and the conductive arms are equipotential when they rotate relative to each other, thereby preventing occurrence of a floating potential within the rotation shaft, and avoiding a safety risk due to a discharge of the rotation shaft into the air.

[0007] According to a preferred embodiment of the present disclosure, the equipotential connection member comprises a plurality of connection legs evenly distributed along its circumferential direction.

[0008] According to a preferred embodiment of the present disclosure, the equipotential connection member comprises three connection legs evenly distributed at an angular interval of 120°.

[0009] According to a preferred embodiment of the present disclosure, the equipotential connection structure further comprises a first positioning pin and a second positioning pin, wherein the first positioning pin radially passes through the rotation shaft to allow the rotation shaft to be axially positioned relative to the first conductive arm, and the second positioning pin radially passes through the rotation shaft to allow the rotation shaft to be axially positioned relative to the second conductive arm, and wherein the equipotential connection member is electrically connected to the first positioning pin or the second positioning pin .

[0010] According to a preferred embodiment of the present disclosure, the body is sandwiched between the first positioning pin and the first insulated sleeve and is electrically connected to the first positioning pin, or the body is sandwiched between the second positioning pin and the second insulated sleeve and is electrically connected to the second positioning pin.

[0011] According to a preferred embodiment of the present disclosure, the body is sandwiched between the first positioning pin and the first insulated sleeve by at least one washer and is electrically connected to the first positioning pin via the washer, or the body is sandwiched between the second positioning pin and the second insulated sleeve by at leastone washer and is electrically connected to the second positioning pin via the washer.

[0012] A second aspect of the present disclosure provides a switchgear device comprising the equipotential connection structure according to the first aspect of the present disclosure.

[0013] A third aspect of the present disclosure provides a method for manufacturing an equipotential connection structure for a switchgear device, comprising: providing a first conductive arm and a second conductive arm, and pivotably connecting the first conductive arm to the second conductive arm by a rotation shaft, wherein the rotation shaft passes through and is rotatably mounted into a first hole provided in the first conductive arm by a first insulated sleeve, and the rotation shaft passes through and is rotatably mounted into a second hole provided in the second conductive arm by a second insulated sleeve; providing an equipotential connection member comprising a body and at least one connection leg extending from the body; and arranging the body to be sleeved on the rotation shaft and electrically connected to the rotation shaft, and arranging the connection leg to abut against the first conductive arm or the second conductive arm to allow the rotation 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 comprises: arranging a first positioning pin to radially pass through the rotation shaft to allow the rotation shaft to be axially positioned relative to the first conductive arm; arranging a second positioning pin to radially pass through the rotation shaft to allow the rotation shaft to be axially positioned relative to the second conductive arm; and electrically connecting the equipotential connection member to the first positioning pin or the second positioning pin.

[0015] According to a preferred embodiment of the present disclosure, the method further comprises: arranging the body to be sandwiched between the first positioning pin and the first insulated sleeve by at least one washer and electrically connected to the first positioning pin via the washer, or arranging the body to be sandwiched between the second positioning pin and the second insulated sleeve by at least one washer and electrically connected to the second positioning pin via the washer.

[0016] The equipotential connection structure according to the present disclosure is simple, cost-effective and easy to assemble, thus can be widely used in various types of switchgear device.

[0017] Generally, all terms used in the claims are to be interpreted according to their ordinarymeaning in the technical field, unless explicitly defined otherwise herein. All references to “a / an / the element, device, component, member, means, step, etc.” are to be interpreted openly as referring to at least one instance of the element, device, component, member, means, step, etc., unless explicitly stated otherwise.BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features and advantages of the present disclosure will be better understood through the following preferred embodiment described in detail with reference to the accompanying drawings, in which a same reference numeral indicates a same or similar component.

[0019] Fig.1 shows a partial schematic view of a switchgear device according to an embodiment of the present disclosure in a first state.

[0020] Fig.2 shows a partial schematic view of the switchgear device shown in Fig.l in a second state.

[0021] Fig.3 shows an enlarged view of an equipotential connection structure of the switchgear device shown in Fig.l in the first state.

[0022] Fig.4 shows an enlarged view of the equipotential connection structure shown in Fig.3 in the second state.

[0023] Fig.5 shows a cutaway schematic view of the equipotential connection structure shown in Fig.3

[0024] Fig.6 shows an exploded view of the equipotential connection structure shown in Fig.3.

[0025] Fig.7 shows a perspective view of an equipotential connection member of the equipotential connection structure shown in Fig.3.

[0026] Fig.8 shows a cross-sectional view of the equipotential connection structure shown in Fig.3.

[0027] It should be noted that the drawings not only are used for the explanation and description of the present disclosure, but also are helpful for the definition of the present disclosure when necessary.DETAILED DESCRIPTION

[0028] The implementation and usage of the embodiment are discussed in detail below. However, it should be understood that the specific embodiment discussed are merely intended to illustrate specific ways of implementing and using the present disclosure, and are not intended to limit the protection scope of the present disclosure.

[0029] As a non-limitative example, the switchgear device according to the present disclosure is a pantograph disconnector PD as shown in the accompanying drawings. Specifically, as shown in Figs.l and 2, a main blade of the pantograph disconnector PD is supported by a support insulator 11 and comprises a first conductive arm 20 (i.e., an upper conductive arm) and a second conductive arm 30 (i.e., a lower conductive arm pivotably connected to the support insulator 11) that are pivotably connected to each other. In an opened state shown in Fig. l, the first conductive arm 20 and the second conductive arm 30 are rotated to form a smaller angle therebetween, and a top moving contact or moving contact finger 22 of the first conductive arm 20 is separated from an external fitting to break an electrical connection. In a closed state shown in Fig.2, the first conductive arm 20 and the second conductive arm 30 are rotated by a drive insulator 12 to form a larger angle therebetween, and the top moving contact or moving contact finger 22 of the first conductive arm 20 is in contact with the external fitting to form the electrical connection.

[0030] As shown in Figs.3 to 6, the first conductive arm 20 comprises two first connection blocks 21 positioned at a lower end thereof, and the second conductive arm 30 comprises two second connection blocks 31 positioned at an upper end thereof. A rotation shaft 50 passes through and is rotatably mounted into a first hole 211 provided in each of the first connection blocks 21 by a first insulated sleeve 61, and passes through and is rotatably mounted into a second hole 311 provided in each of the second connection blocks 31 by a second insulated sleeve 62, such that the first conductive arm 20 and the second conductive arm 30 are pivotably connected to each other by the rotation shaft 50.

[0031] Further, each of the first connection blocks 21 is provided with a plurality of first connection holes 212, and a first connection plate 41 is mounted and electrically connected to each of the first connection blocks 21 by a plurality of bolts 44 passing through the first connection holes 212. Each of the second connection blocks 31 is provided with a plurality of second connection holes 312, and a second connection plate 42 is mounted and electricallyconnected to each of the second connection blocks 31 by a plurality of bolts 44 passing through the second connection holes 312. The first connection plate 41 and the second connection plate 42 are electrically connected to each other by a flexible connection sheet (a soft connection) 43, such that the first conductive arm 20 and the second conductive arm 30 are electrically connected to each other. As shown in Figs.3 and 4, when the first conductive arm 20 and the second conductive arm 30 are rotated relative to each other via the rotation shaft 50 between the closed state and the opened state, the first conductive arm 20 and the second conductive arm 30 are arranged to remain electrically connected to each other by bending deformation of the flexible connection sheet 43.

[0032] Since the rotation shaft 50 is separated from the first conductive arm 20 by the first insulated sleeve 61 and from the second conductive arm 30 by the second insulated sleeve 62, when the main blade is subjected to a high rated voltage, a floating potential will occur in the rotation shaft 50, whereby the rotating shaft 50 may discharge into the air and create a safety risk.

[0033] Thus, as shown in Figs 6 to 8, the pantograph disconnector PD of the present disclosure further comprises an equipotential connection member 90 comprising an annular body 91 and at least one connection leg 92 extending from an outer edge of the body 91. The body 91 is sleeved on the rotation shaft 50 and electrically connected to the rotation shaft 50. The at least one connection leg 92 elastically abuts against one of the first connection blocks 21 of the first conductive arm 20 or one of the second connection blocks 31 of the second conductive arm 30 to allow the rotation shaft 50 to be electrically connected to the first conductive arm 20 or the second conductive arm 30, thereby preventing the occurrence of the floating potential within the rotation shaft 50. Preferably, the equipotential connection member 90 comprises a plurality of connection legs 92, for example two to five connection legs 92, evenly distributed along its circumferential direction. In the shown embodiment, the equipotential connection member 90 comprises three connection legs 92 evenly distributed at an angular interval of 120°.

[0034] The detailed construction and assembling method of the equipotential connection structure S of the pantograph disconnector PD is described below with the help of Figs.6 to 8.

[0035] As shown in Fig.6 to 8, the equipotential connection structure S comprises 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 positioning pin 71 and the second positioning pin 72 is, for example, a cotter pin. After the first conductive arm 20 and the second conductive arm 30 are pivotably connected to each other by the rotation shaft 50, the first positioning pin 71 is arranged to radially pass through a first through-hole 51 provided in the rotation shaft 50 and protruding from the rotation shaft 50 to allow the rotation shaft 50 to be axially positioned relative to the first connection block 21 of the first conductive arm 20, and the second positioning pin 72 is arranged to radially pass through a second through-hole 52 provided in the rotation shaft 50 and protruding from the rotation shaft 50 to allow the rotation shaft 50 to be axially positioned relative to the second connection block 31 of the second conductive arm 30, whereby the rotation shaft 50 will not come loose from the first conductive arm 20 and the second conductive arm 30.

[0037] Specifically, the first washer 81 is arranged to be sleeved on the rotation shaft 50 and tightly sandwiched between the first positioning pin 71 and a flange 611 of the first insulated sleeve 61, and the second washer 82, the body 91 of the equipotential connection member 90, and the third washer 83 are arranged to be sequentially sleeved on the rotation shaft 50 and tightly sandwiched between a flange 621 of the second insulated sleeve 62 and the second positioning pin 72 to allow the body 91 to be electrically connected to the second positioning pin 72 via the third washer 83, and to allow an abutting end 921 of the connection leg 92 of the equipotential connection member 90 to abut against the second connection block 31 of the second conductive arm 30 to be electrically connected to the second conductive arm 30. Thus, the second conductive arm 30, the equipotential connection member 90, the third washer 83, the second positioning pin 72 and the rotation shaft 50 are electrically connected in sequence, thus preventing the occurrence of the floating potential within the rotation shaft 50.

[0038] According to a non-illustrated variant, the body 91 of the equipotential connection member 90 may be arranged to be sandwiched between the first positioning pin 71 and the flange 611 of the first insulated sleeve 61 by at least one washer and electrically connected to the first positioning pin 71 via the washer, and the abutting end 921 of the connection leg 92 of the equipotential connection member 90 may be arranged to abut against the first connection block 21 of the first conductive arm 20 to be electrically connected to the first conductive arm 20, whereby the first conductive arm 20 is electrically connected to the rotation shaft 50 via the equipotential connection member 90, thus preventing the occurrence of the floating potential within the rotation shaft 50.

[0039] In summary, the equipotential connection structure S according to the present disclosure is simple, cost-effective and easy to assemble, and the switchgear device to which it is applied is not limited to the pantograph disconnector PD as shown. In fact, the equipotential connection structure S according to the present disclosure is adapted to be applied to any type of switchgear device comprising two conductive arms pivotably connected to each other by a rotation shaft with a floating potential.

[0040] The technical contents and features of the present disclosure have been disclosed above. However, it is conceivable that, under the creative ideas of the present disclosure, those skilled in the art can make various changes and improvements to the concepts disclosed above, but these changes and improvements all belong to the protection scope of the present disclosure. The description of the above embodiment is exemplary rather than limitative, and the protection scope of the present disclosure is defined by the appended claims.

Claims

CLAIMS1. An equipotential connection structure (S) for a switchgear device (PD), comprising a first conductive arm (20) and a second conductive arm (30) pivotably connected to each other by a rotation shaft (50), wherein the rotation shaft (50) passes through and is rotatably mounted into a first hole (211) provided in the first conductive arm (20) by a first insulated sleeve (61), and the rotation shaft (50) passes through and is rotatably mounted into a second hole (311) provided in the second conductive arm (30) by a second insulated sleeve (62), and wherein the equipotential connection structure (S) further comprises an equipotential connection member (90) comprising: a body (91) sleeved on the rotation shaft (50) and electrically connected to the rotation shaft (50); and at least one connection leg (92) extending from the body (91) and abutting against the first conductive arm (20) or the second conductive arm (30) to allow the rotation shaft (50) to be electrically connected to the first conductive arm (20) or the second conductive arm (30).

2. The equipotential connection structure (S) according to claim 1, wherein the equipotential connection member (90) comprises a plurality of connection legs (92) evenly distributed along its circumferential direction.

3. The equipotential connection structure (S) according to claim 2, wherein the equipotential connection member (90) comprises three connection legs (92) evenly distributed at an angular interval of 120°.

4. The equipotential connection structure (S) according to any one of claims 1 to 3, wherein the equipotential connection structure (S) further comprises a first positioning pin (71) and a second positioning pin (72), wherein the first positioning pin (71) radially passes through the rotation shaft (50) to allow the rotation shaft (50) to be axially positioned relative to the first conductive arm (20), and the second positioning pin (72) radially passes through the rotation shaft (50) to allow the rotation shaft (50) to be axially positioned relative to the second conductive arm (30), and wherein the equipotential connection member (90) iselectrically connected to the first positioning pin (71) or the second positioning pin (72).

5. The equipotential connection structure (S) according to claim 4, wherein the body (91) is sandwiched between the first positioning pin (71) and the first insulated sleeve (61) and is electrically connected to the first positioning pin (71), or the body (91) is sandwiched between the second positioning pin (72) and the second insulated sleeve (62) and is electrically connected to the second positioning pin (72).

6. The equipotential connection structure (S) according to claim 5, wherein the body (91) is sandwiched between the first positioning pin (71) and the first insulated 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 insulated sleeve (62) by at least one washer and is electrically connected to the second positioning pin (72) via the washer.

7. A switchgear device (PD) comprising the equipotential connection structure (S) according to any one of claims 1 to 6.

8. A method for manufacturing an equipotential connection structure (S) for a switchgear device (PD), comprising: providing a first conductive arm (20) and a second conductive arm (30), and pivotably connecting the first conductive arm (20) to the second conductive arm (30) by a rotation shaft (50), wherein the rotation shaft (50) passes through and is rotatably mounted into a first hole (211) provided in the first conductive arm (20) by a first insulated sleeve (61), and the rotation shaft (50) passes through and is rotatably mounted into a second hole (311) provided in the second conductive arm (30) by a second insulated sleeve (62), wherein the method further comprises: providing an equipotential connection member (90) comprising a body (91) and at least one connection leg (92) extending from the body (91); and arranging the body (91) to be sleeved on the rotation shaft (50) and electricallyconnected to the rotation shaft (50), and arranging the connection leg (92) to abut against the first conductive arm (20) or the second conductive arm (30) to allow the rotation 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 comprises: arranging a first positioning pin (71) to radially pass through the rotation shaft (50) to allow the rotation shaft (50) to be axially positioned relative to the first conductive arm (20); arranging a second positioning pin (72) to radially pass through the rotation shaft (50) to allow the rotation shaft (50) to be axially positioned relative to the second conductive arm (30); and electrically connecting the equipotential connection member (90) to the first positioning pin (71) or the second positioning pin (72).

10. The method according to claim 8, wherein the method further comprises: arranging the body (91) to be sandwiched between the first positioning pin (71) and the first insulated sleeve (61) by at least one washer and electrically connected to the first positioning pin (71) via the washer, or arranging the body (91) to be sandwiched between the second positioning pin (72) and the second insulated sleeve (62) by at least one washer and electrically connected to the second positioning pin (72) via the washer.

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