Equipotential structure for isolating switch

Abstract

The invention relates to an equipotential structure for an isolating switch, which comprises a gear shaft mounted on a contact seat of the isolating switch and an operating mechanism, the gear shaft is provided with a first jack, a first connecting plug is arranged in the first jack, the first connecting plug is provided with an elastic contact finger, and the elastic contact finger is in contact with the inner wall of the first jack. The operating mechanism output shaft is in transmission connection with the first connecting plug through a transmission shaft, the operating mechanism output shaft is provided with a second connecting plug, one end of the second connecting plug is connected with the transmission shaft, the other end of the second connecting plug is provided with a second jack, a spring is arranged in the second jack, and the operating mechanism output shaft is inserted in the second jack and is in contact with the spring. The first connecting plug and the gear shaft are in contact through the elastic contact finger to form a conductive path, and the operating mechanism and the second connecting plug are in contact through the spring to form a conductive path, so that the gear shaft, the first connecting plug, the operating mechanism and the second connecting plug realize equipotential protection.

Description

Technical Field

[0001] The invention relates to the technical field of isolating switches, and in particular to an equipotential structure for isolating switches. Background Art

[0002] GIS equipment refers to metal-enclosed switchgear that uses insulating gas as the insulating medium in whole or in part. It is widely used in power systems due to its advantages of small footprint, being basically unaffected by the external environment, low maintenance workload, and safe and reliable operation. Isolating switches are important units in GIS equipment. They carry current and isolate the equipment. They have the ability to open and close busbars to convert current, charging current (small capacitor current), and small inductive current.

[0003] During the manufacturing, installation and operation of disconnectors, insulation defects such as suspended discharge are often inevitable, especially in the switch drive mechanism of the disconnector. Due to factors such as transportation or long-term use and wear, gaps will form inside. When high voltage is passed through the disconnector, the internal local electric field may be distorted, leading to internal partial discharge, causing damage to the disconnector and seriously endangering the safe operation of the power grid. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides an equipotential structure for an isolating switch, which can prevent the isolating switch from being damaged by suspended discharge and ensure the reliable operation of the power grid.

[0005] The present invention is achieved through the following technical scheme: an equipotential structure for an isolating switch, comprising a gear shaft installed on a contact seat of the isolating switch, and an operating mechanism, wherein the gear shaft is provided with a first jack, a first plug connector is provided in the first jack, an elastic contact finger is provided on the first plug connector, the elastic contact finger contacts the inner wall of the first jack, and the output shaft of the operating mechanism is connected to the first plug connector through a transmission shaft.

[0006] The operating mechanism of this scheme is driven by the transmission shaft, and the first plug connector connected to the transmission shaft drives the rotation of the gear shaft, thereby driving the moving contact of the disconnector to perform a switching action. During the transportation and installation process or long-term use, a gap will be generated between the first jack of the gear shaft and the first plug connector, and a suspended discharge phenomenon will occur between the gaps when high voltage is passed. The first plug connector and the first jack are connected to form a conductive path through the elastic contact finger, and the current is guided to flow through the conductive path, so that the gear shaft and the first plug connector can achieve the purpose of equipotentiality.

[0007] As an optimization, the first plug hole is a square hole, and the first plug connector is provided with a rectangular plug part adapted to the first plug hole. This optimization solution realizes the first plug connector driving the rotation of the gear shaft through the plug-in engagement of the square hole and the rectangular plug part.

[0008] As an optimization, the elastic contact finger is a bent plate, and its cross section includes a first vertical side and a first oblique side, the first vertical side is fixed to the end of the rectangular plug-in portion, one end of the first oblique side is fixed to one end of the first vertical side, and the other end of the first oblique side contacts the inner wall of the first plug hole. The elastic contact finger of this optimization solution can always maintain the connection between the first plug connector and the first plug hole.

[0009] As an optimization, the angle between the first oblique side and the first vertical side is 100° to 120°. This optimization solution enables the first oblique side to elastically press against the inner wall of the first plug hole to maintain connection stability.

[0010] As an optimization, a threaded hole is provided at the end of the rectangular plug-in portion, and the first vertical side is screwed to the threaded hole by a screw. This optimization solution facilitates the installation of the elastic contact finger.

[0011] As an optimization, the outer wall of the rectangular plug portion is provided with a receiving groove for receiving the first bevel. When the first plug connector is inserted into the first jack, the first bevel is received in the receiving groove, which facilitates the installation of the first plug connector.

[0012] As an optimization, the output shaft of the operating mechanism is provided with a second plug connector, one end of the second plug connector is connected to the transmission shaft, the other end of the second plug connector is provided with a second socket, a spring is provided in the second socket, and the output shaft of the operating mechanism is inserted into the second socket and contacts the spring. The output end of this optimization solution drives the transmission shaft to move through the second plug connector and then drives the rotation of the gear shaft. During the transportation and installation process or long-term use, due to the gap between the output end and the second socket, a suspended discharge phenomenon occurs between the gaps when high voltage is passed, and the output shaft and the second socket are connected by the spring to form a conductive path, and the current is guided and circulated through the conductive path, so that the operating mechanism and the second plug connector achieve the purpose of equal potential.

[0013] As an optimization, the output shaft of the operating mechanism is a regular hexagonal shaft body, and the second plug hole is a regular hexagonal hole. This optimization scheme adopts a regular hexagonal structure to achieve the output end driving the rotation of the second plug connector.

[0014] As an optimization, a fixing hole is provided at the bottom of the second insertion hole, and the spring is inserted into the fixing hole. This optimization solution improves the stability of the spring fixation.

[0015] As an optimization, the isolating switch is provided with three-phase contact seats arranged in sequence in the transverse direction, the gear shafts are installed on the three-phase contact seats, the first plug holes are through holes, the first plug connectors are plugged into both ends of the first through holes, the adjacent two first plug connectors of adjacent gear shafts are connected by a transmission shaft, and the output shaft of the operating mechanism is connected by a transmission connection with the first plug connector at the outer end. The operating mechanism of this optimization scheme can synchronously drive the three gear shafts of the three-phase contact seat to rotate synchronously, and then drive the three moving contacts on the three-phase contact seat to slide synchronously, which is easy to use.

[0016] The beneficial effects of the present invention are as follows: the device drives the transmission shaft to rotate through a second plug connector via an operating mechanism output shaft, and the three gear shafts of the three-phase contact seat are driven to move synchronously through the transmission shaft, thereby driving the three-phase moving contacts of the isolating switch to perform switching actions synchronously, which is easy to use.

[0017] During the transportation and installation process or long-term use, gaps will be generated between the first socket and the first plug connector of the gear shaft, and between the output shaft of the operating mechanism and the second socket of the second plug connector. When high voltage is applied, suspended discharge will occur between the gaps. Therefore, the first plug connector and the gear shaft are contacted by elastic contacts to form a conductive path, and the operating mechanism and the second plug connector are contacted by a spring to form a conductive path, so that the gear shaft and the first plug connector, the operating mechanism and the second plug connector can achieve equipotential protection, thereby preventing suspended discharge from damaging the disconnector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 are a front view and a side view of the first plug connector; Figure 3 It is a front view and a side view of the elastic contact finger; Figure 4 It is a schematic diagram of the installation of the elastic contact finger and the first plug connector; Figure 5 This is a schematic diagram of the installation of the first plug connector and the gear shaft; Figure 6 for Figure 5 A magnified view of; Figure 7 are a front view and a side view of the second plug connector; Figure 8 This is a schematic diagram of the installation of the second plug connector and the operating mechanism; As shown in the figure: 1. contact seat, 11. moving contact, 12. gear, 13. rack, 2. gear shaft, 21. bearing, 22. first plug hole, 3. operating mechanism, 31. output shaft of operating mechanism, 4. transmission shaft, 41. third plug hole, 5. first plug connector, 51. rectangular plug part, 52. accommodating groove, 53. threaded hole, 54. screw, 6. second plug connector, 61. cylindrical plug part, 62. second plug hole, 63. fixing hole, 7. elastic contact finger, 71. first vertical side, 72. first oblique side, 8. spring, 9. connecting part. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0020] like Figures 1 to 8 As shown, an equipotential structure for an isolating switch includes a gear shaft 2 mounted on a contact seat 1 of the isolating switch, and an operating mechanism 3. Figure 1 As shown, specifically, the isolating switch is provided with three-phase contact seats 1 arranged in sequence along the transverse direction, and the gear shaft 2 is mounted on each of the three-phase contact seats 1 .

[0021] like Figure 5 As shown, the two ends of the outer wall of the gear shaft 2 are rotatably connected to the contact seat 1 through bearings 21. A moving contact 11 is arranged inside the contact seat 1. The moving contact 11 slides along the axial direction of the contact seat. A rack groove is provided on the top of the moving contact 11. A rack 13 is fixed in the rack groove. The rack extends along the length direction of the moving contact. The gear 12 on the outer wall of the gear shaft 2 is meshed with the rack 13 on the moving contact 11, so that the sliding of the moving contact 11 is driven by the rotation of the gear shaft 2, thereby realizing the opening and closing action of the disconnector. This is an existing conventional technology and will not be described in detail here.

[0022] like Figure 2 , 5 As shown, the gear shaft 2 is provided with a first plug hole 22, and a first plug connector 5 is provided in the first plug hole 22. Specifically, the first plug hole 22 is a through hole, and the first plug connector 5 is plugged into both ends of the first plug hole 22. In this embodiment, the first plug hole 22 is a square hole, and the first plug connector 5 is provided with a rectangular plug portion 51 adapted to the first plug hole. The first plug connector 5 is inserted into the square first plug hole 22 through the rectangular plug portion 51 to achieve engagement, thereby driving the rotation of the gear shaft.

[0023] like Figure 3 , 6 As shown, the first plug connector 5 is provided with an elastic contact finger 7, which contacts the inner wall of the first plug hole 22. The elastic contact finger 7 in this embodiment is an integrally formed bent plate, and its cross section includes a first vertical side 71 and a first oblique side 72, and the angle between the first oblique side 72 and the first vertical side 71 is 100° to 120°.

[0024] like Figure 4 As shown, the first vertical side 71 is fixed to the end of the rectangular plug-in portion 51, one end of the first oblique side 72 is fixed to one end of the first vertical side 71, and the other end of the first oblique side 72 contacts the inner wall of the first plug hole 22. A threaded hole 53 is provided at the end of the rectangular plug-in portion 51 described in this embodiment, and the first vertical side 71 is screwed and fixed to the threaded hole 53 by a screw 54. A receiving groove 52 for receiving the first oblique side 72 is provided on the outer wall of the rectangular plug-in portion 51, and the first oblique side is located in the receiving groove. The first plug connector 5 is electrically connected to the gear shaft 2 through the elastic contact finger 7, so as to achieve the purpose of equal potential between the gear shaft and the first plug connector. The elastic contact finger can withstand discharge in the first time to prevent the suspended discharge from damaging the single-phase contact seat.

[0025] like Figure 1 As shown, specifically, the axes of the three gear shafts 2 are located on the same axis, and the adjacent two first plug connectors 5 of the adjacent gear shafts 2 are connected by a transmission shaft 4. The three gear shafts are connected by the transmission shaft to achieve synchronous rotation, thereby driving the three moving contacts of the three-phase contact seat to move synchronously.

[0026] The operating mechanism 3 is used to provide driving force for the rotation of the gear shaft, which is an existing conventional technology, and the specific structure is not repeated here. The operating mechanism output shaft 31 is connected to the first plug connector 5 through the transmission shaft 4. In this embodiment, the operating mechanism output shaft 31 and the axis of the three gear shafts 2 are located on the same axis, and the operating mechanism output shaft 31 is connected to the first plug connector 5 located at the outer end through the transmission shaft 4, so that the operating mechanism 3 drives the three gear shafts 2 to rotate synchronously.

[0027] like Figure 7 , 8 As shown, specifically, the operating mechanism output shaft 31 is provided with a second plug connector 6, one end of the second plug connector 6 is connected to the transmission shaft 4, and the other end of the second plug connector 6 is provided with a second socket 62, and a spring 8 is provided in the second socket 62. The operating mechanism output shaft 31 is inserted into the second socket 62 and contacts the spring 8.

[0028] The output shaft 31 of the operating mechanism in this embodiment is a regular hexagonal shaft, and the second plug hole 62 is a regular hexagonal hole adapted to the shaft. A fixing hole 63 is provided at the bottom of the second plug hole 62, and the spring 8 is inserted into the fixing hole 63, with one end of the spring 8 resting on the bottom of the fixing hole 63, and the other end of the spring 8 resting on the end of the output shaft 31 of the operating mechanism. The output shaft 31 of the operating mechanism is in contact with the second plug connector 6 through the spring 8 to achieve conductive connection, so as to achieve the purpose of equal potential between the operating mechanism and the second plug connector, and the spring can withstand discharge in the first time to prevent the suspension discharge from causing damage to the driving mechanism.

[0029] In this embodiment, the first plug connector 5 includes a trumpet-shaped connecting portion 9 and the rectangular plug-in portion 51. The rectangular plug-in portion 51 is located at the large-diameter end of the connecting portion 9. The rectangular plug-in portion 51 and the connecting portion 9 are an integrally formed structure.

[0030] The second plug connector of this embodiment also includes a trumpet-shaped connecting portion 9 and a cylindrical plug connector 61, wherein the cylindrical plug connector 61 is located at the large-diameter end of the connecting portion 9, and the cylindrical plug connector 61 and the connecting portion 9 are an integrally formed structure. The second plug connector 6 is rotatably mounted on the operating mechanism 3 through the cylindrical plug connector 61, the second plug hole 62 is provided at the end of the cylindrical plug connector 61, and the operating mechanism output shaft 31 is inserted into the second plug hole 62, thereby driving the rotation of the second plug connector 6.

[0031] The transmission shaft 4 in this embodiment is an insulating shaft. Both ends of the transmission shaft 4 are provided with third plug holes 41 adapted to the connecting portion 9 . The first plug connector 5 or the second plug connector 6 is fixedly connected to the transmission shaft 4 via the connecting portion 9 .

[0032] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An equipotential structure for an isolating switch, comprising a gear shaft (2) mounted on an isolating switch contact seat (1), and an operating mechanism (3), characterized in that: The gear shaft (2) is provided with a first plug hole (22), a first plug connector (5) is provided in the first plug hole, an elastic contact finger (7) is fixedly provided on the first plug connector (5), the elastic contact finger is in contact with the inner wall of the first plug hole (22), and the operating mechanism output shaft (31) and the first plug connector (5) are connected in transmission via a transmission shaft (4).

2. The equipotential structure for an isolating switch according to claim 1, characterized in that: The first plug hole (22) is a square hole, and the first plug connector (5) is provided with a rectangular plug portion (51) adapted to the first plug hole (22).

3. The equipotential structure for an isolating switch according to claim 2, characterized in that: The elastic contact finger (7) is a bent plate, and its cross section comprises a first vertical side (71) and a first oblique side (72), the first vertical side (71) being fixedly connected to the end of the rectangular plug-in portion (51), one end of the first oblique side being fixedly connected to one end of the first vertical side, and the other end of the first oblique side (72) being in contact with the inner wall of the first plug hole (22).

4. The equipotential structure for an isolating switch according to claim 3, characterized in that: The included angle between the first oblique side (72) and the first vertical side (71) is 100° to 120°.

5. The equipotential structure for an isolating switch according to claim 3, characterized in that: A threaded hole (53) is provided at the end of the rectangular plug-in portion (51), and the first vertical side (71) is screwed to the threaded hole via a screw (54).

6. The equipotential structure for an isolating switch according to claim 3, characterized in that: The outer wall of the rectangular plug-in portion (51) is provided with a receiving groove (52) for receiving the first beveled edge (72).

7. The equipotential structure for an isolating switch according to claim 1, characterized in that: The operating mechanism output shaft (31) is provided with a second plug connector (6), one end of the second plug connector (6) is connected to the transmission shaft (4), the other end of the second plug connector is provided with a second plug hole (62), a spring (8) is provided in the second plug hole, and the operating mechanism output shaft (31) is inserted into the second plug hole (62) and contacts the spring (8).

8. The equipotential structure for an isolating switch according to claim 7, characterized in that: The operating mechanism output shaft (31) is a regular hexagonal shaft body, and the second insertion hole (62) is a regular hexagonal hole.

9. The equipotential structure for an isolating switch according to claim 7, characterized in that: A fixing hole (63) is provided at the bottom of the second insertion hole (62), and the spring (8) is inserted into the fixing hole.

10. The equipotential structure for an isolating switch according to claim 1, characterized in that: The isolating switch is provided with three-phase contact seats (1) arranged in sequence in a transverse direction, the gear shafts (2) are all mounted on the three-phase contact seats, the first plug holes (22) are through holes, both ends of the first plug holes are plugged with the first plug connectors (5), two adjacent first plug connectors (5) of adjacent gear shafts (2) are transmission-connected via a transmission shaft (4), and the operating mechanism output shaft (31) is transmission-connected to the first plug connectors (5) located at the outer ends.

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