Multi-station isolation grounding switch

Abstract

According to the multi-station isolation grounding switch, each station is driven by an independent driving motor and an independent transmission device, a switch body is provided with four moving contacts, the four moving contacts are arranged in a cross shape, the direction of each moving contact corresponds to a static contact, three of the moving contacts are isolation switch static contacts arranged in three buses, and the other moving contacts are isolation switch static contacts arranged in three buses. One is a grounding switch static contact; an isolating fracture is arranged between the moving contact and the isolating switch static contact, and a grounding fracture is arranged between the moving contact and the grounding switch static contact. Transmission racks are arranged on the two sides of the moving contact, a transmission gear on one side is meshed with the switching-on gear and the interphase transmission piece, and a transmission gear on the other side is meshed with the switching-off gear and the interphase transmission piece; the transmission mechanism drives the switching-on gear and the interphase transmission member or the switching-off gear and the interphase transmission member to rotate, and the moving contact can be inserted into or far away from the corresponding static contact. Through the above structure, a multi-station transmission system is designed, the disconnecting switch is endowed with a flexible switching function, and the development requirement of an intelligent power grid is met.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage switch transmission equipment, in particular to a multi-station isolating earthing switch. Background Art

[0002] The 110kV and 220kV power networks are important components of our power transmission system, generally being the upper-level power supply networks of urban distribution networks. With the development of urbanization, the power consumption load has increased sharply, and the requirements for the power supply reliability and flexibility of the power grid have also increased.

[0003] In the existing power systems of 220kV and below, the isolating earthing switches that are widely used mostly adopt two-station and three-station technical solutions. Since the insulation parameters of the products at this voltage level are not high, considering the manufacturing, transportation and installation costs, the switches are generally made into three-phase coaxial boxes. The phases are connected and driven through insulating columns. Since the operation of the isolating earthing switch does not involve the opening and closing of large currents and the opening and closing speeds are relatively low, a motor drive system is generally used for driving.

[0004] Based on the existing linear drive technology, that is, a rack and pinion drive system, the utility model designs a drive system that can independently drive multiple breaking points, realizes various isolating earthing combination forms, and strongly supports the development and progress of the flexible power supply and maintenance technology of the intelligent power grid. Summary of the Invention

[0005] The utility model adopts a multi-station isolating earthing switch and matches it with a drive device that can independently control the opening and closing of each switch contact. With the help of this switch device, the switching and earthing between multiple busbars can be realized, and the flexibility and reliability of the power grid power supply and maintenance can be improved.

[0006] The utility model is realized through the following technical solutions: a multi-station isolating earthing switch, on which four moving contacts are provided on the switch body. The four moving contacts are arranged in a cross shape, and the included angle between them is 90°. A static contact corresponds to each moving contact direction. Among them, three static contacts are the isolating switch static contacts arranged in three busbars, and one static contact is the earthing switch static contact; an isolating break is arranged between the moving contact and the isolating switch static contact, and an earthing break is arranged between the moving contact and the earthing switch static contact;

[0007] Driving racks are arranged on both sides of the moving contact. One side driving gear meshes with the closing gear and the inter-phase driving member, and the other side driving gear meshes with the opening gear and the inter-phase driving member; by driving the closing gear and the inter-phase driving member or the opening gear and the inter-phase driving member to rotate through the driving mechanism, the moving contact can be inserted into or separated from the corresponding static contact.

[0008] The switch body is installed inside the overall switch through an insulating support rod. The switch body includes a support base. The moving contact is installed in the assembly groove of the support base. A conductive finger is provided outside the end of the moving contact close to the static contact. A closing transmission dead zone is provided at the end of the transmission rack on one side of the moving contact, and a tripping transmission dead zone is provided at the end of the transmission rack on the other side of the moving contact.

[0009] The transmission mechanism includes a driving motor. The driving motor meshes with a closing ratchet gear and a commutation gear set through a speed-changing gear set. The commutation gear set meshes with a tripping ratchet gear. The closing ratchet gear drives a closing gear and an interphase transmission member, and the tripping ratchet gear drives a tripping gear and an interphase transmission member.

[0010] The closing gear and the interphase transmission member include three closing output gears. Between the three closing output gears and between the closing output gear and the closing ratchet gear, they are connected by an interphase transmission insulating rod.

[0011] The tripping gear and the interphase transmission member include three tripping output gears. Between the three tripping output gears and between the tripping output gear and the closing ratchet gear, they are connected by an interphase transmission insulating rod.

[0012] The beneficial effects of the present utility model are as follows: Through the above structure, the present utility model uses a multi-station isolating earthing switch to replace the two-station and three-station isolating earthing equipment commonly used in the power system. The structure has flexible station switching, which better meets the development needs of intelligent urban power supply. While endowing the isolating switch with the function of flexible switching, it meets the development requirements of the smart grid. Description of the Drawings

[0013] Figure 1 Single-phase sectional view of the multi-station isolating earthing switch;

[0014] Figure 2 Single-phase sectional view of the multi-station isolating earthing switch body;

[0015] Figure 3 Drive schematic diagram of each station;

[0016] Figure 4 Interphase drive schematic diagram;

[0017] Figure 5 Structure diagram of a conventional three-station isolating earthing switch.

[0018] In the figure: 1 - busbar; 2 - isolating break; 3 - switch body, 4 - static contact of the isolating switch; 5 - earthing break; 6 - static contact of the earthing switch; 7 - transmission mechanism; 8 - support insulating rod;

[0019] 3.1 - Moving contact; 3.2 - Conductive finger; 3.3 - Closing gear and phase - to - phase transmission parts; 3.3.1 - Closing output gear; 3.4 - Transmission rack; 3.5 - Closing transmission dead travel; 3.6 - Support seat; 3.7 - Tripping gear and phase - to - phase transmission parts; 3.7.1 - Tripping output gear; 3.8 - Tripping transmission dead travel; 3.9 - Phase - to - phase transmission insulating rod;

[0020] 7.1 - Closing ratchet gear; 7.2 - Driving motor; 7.3 - Speed - changing gear set; 7.4 - Reversing gear set; 7.5 - Tripping ratchet gear; 7.6 - Mechanism frame. Detailed implementation mode

[0021] A multi - station isolating earthing switch, and each station needs to be equipped with a set of transmission device and a driving motor. There are four stations in total. Three stations respectively correspond to three busbars, and one station corresponds to the grounding end. Four moving contacts 3.1 are provided on the switch body 3. The four moving contacts 3.1 are arranged in a cross shape, and the included angle between them is 90°, and there is a static contact corresponding to the direction of each moving contact 3.1. Among them, three static contacts are isolating switch static contacts 4 arranged in three busbars 1, and one static contact is an earthing switch static contact 6; there is an isolating break 2 between the moving contact 3.1 and the isolating switch static contact 4, and there is an earthing break 5 between the moving contact 3.1 and the earthing switch static contact 6.

[0022] The static contact is a special - shaped conductor. One end is processed with a mounting hole and is connected to the pot - type insulator. The other end is processed with a cylindrical inner cavity, and the inner cavity is processed with a finger groove for installing the finger, and forms a conductive connection when meshing with the moving contact.

[0023] The switch body 3 is installed inside the overall switch through the insulating support rod 8. The switch body 3 includes a support seat 3.6. The moving contact 3.1 is installed in the assembly groove of the support seat 3.6. A conductive finger 3.2 is arranged outside the end of the moving contact 3.1 close to the static contact. At the end of the transmission rack 3.4 on one side of the moving contact 3.1, there is a closing transmission dead travel 3.5, and at the end of the transmission rack 3.4 on the other side of the moving contact 3.1, there is a tripping transmission dead travel 3.8. The support seat 3.6 is a cast aluminum component, and its thickness in the z - direction is basically equal, and its shape on the x - y plane is irregular. Cylindrical inner cavities are respectively processed in the x and y directions for installing the moving contact 3.1; a finger groove is processed at the front end of the inner cavity for installing the conductive finger 3.2 to form an electrical connection with the moving contact 3.1; gear grooves are processed along the z - direction on both sides of each inner cavity for installing the closing and tripping drive gears; bolt connection holes are processed at the bottom in the y - direction and can be fixed to the support insulating rod.

[0024] The moving contact is a cylindrical conductor. Two drive rack mounting grooves are symmetrically machined in the direction parallel to the cylinder normal, and drive racks 3.4 are installed. One end of the drive rack 3.4 coincides with the end of the groove, and there is a space on the other side from the end of the groove, forming a drive dead space. The drive dead space on the closing drive side is at the tail of the moving contact, and the dead space on the opening drive side is at the front end of the moving contact.

[0025] Drive racks 3.4 are provided on both sides of the moving contact 3.1. One side of the drive gear 3.4 meshes with the closing gear and the phase-interval drive member 3.3, and the other side of the drive gear 3.4 meshes with the opening gear and the phase-interval drive member 3.7; by driving the closing gear and the phase-interval drive member 3.3 or the opening gear and the phase-interval drive member 3.7 to rotate through the drive mechanism 7, the moving contact 3.1 can be inserted into or away from the corresponding static contact.

[0026] The drive mechanism 7 includes a drive motor 7.2. The drive motor 7.2 meshes with the closing ratchet gear 7.1 and the reversing gear set 7.4 through a speed-changing gear set 7.3, and the reversing gear set 7.4 meshes with the opening ratchet gear 7.5; the closing ratchet gear 7.1 drives the closing gear and the phase-interval drive member 3.3, and the opening ratchet gear 7.5 drives the opening gear and the phase-interval drive member 3.7. Specifically, the closing gear and the phase-interval drive member 3.3 include three closing output gears 3.3.1. Between the three closing output gears 3.3.1 and between the closing output gear 3.3.1 and the closing ratchet gear 7.1, they are connected through a phase-interval drive insulating rod 3.9. The opening gear and the phase-interval drive member 3.7 include three opening output gears 3.7.1. Between the three opening output gears 3.7.1 and between the opening output gear 3.7.1 and the closing ratchet gear 7.1, they are connected through a phase-interval drive insulating rod 3.9.

[0027] During specific use:

[0028] The overall structure of the switch is as Figure 1 shown. The switch body is fixed through a support seat 3.6 and a support insulating rod 8. The isolating static contact 4 and the grounding static contact 6 are fixed on the insulating basin and the cover plate.

[0029] As Figure 2 shown, each moving contact 3.1 has an independent drive system. During the closing operation, the closing action is completed by the closing drive gear 3.3 meshing with the drive rack 3.4. After closing in place, it enters the position of the closing drive dead space 3.5, and the moving contact 3.1 enters the isolating static contact 4, forming a reliable electrical connection through the conductive finger 3.2. During the opening operation, the opening action is completed by the opening drive gear 3.7 meshing with the drive rack 3.4. After opening in place, it enters the position of the opening drive dead space 3.8.

[0030] As Figures 3 - 4As shown, the driving gears of each phase are connected by an inter-phase insulating rod 3.9 to ensure three-phase synchronous movement. Each station is driven by an independent driving motor and a transmission device.

[0031] When the switch receives a closing action instruction, the driving motor 7.2 rotates counterclockwise, adjusts the speed through the speed-changing gear 7.3, then drives the closing ratchet gear 7.1 to rotate clockwise, and then drives the three-phase disconnector to close through the inter-phase insulating rod 3.9; at this time, when the speed-changing gear 7.3 meshes with the opening ratchet gear 7.5 through the reversing gear 7.4, the rotation direction is counterclockwise. Since the opening ratchet gear 7.5 can only rotate clockwise, the opening ratchet gear 7.5 idles at this time. When the switch moves to the closing position, the auxiliary switch switches, the driving motor loses power, and the closing action is completed.

[0032] When the switch receives an opening action instruction, the driving motor 7.2 rotates clockwise, adjusts the speed through the speed-changing gear 7.3, meshes with the opening ratchet gear 7.5 through the reversing gear 7.4, and then drives the three-phase disconnector to open through the inter-phase insulating rod 3.9; at this time, the closing ratchet gear 7.1 idles counterclockwise. When the switch moves to the opening position, the auxiliary switch switches, the driving motor loses power, and the opening action is completed.

[0033] Figure 5 It is a conventional three-position isolating earthing switch. This structure can only achieve the isolation and earthing functions of a single isolating disconnector. This technical solution can achieve the control and protection of multiple disconnectors.

[0034] Compared with the conventional three-position product, this switch can freely combine three busbars with the earthing switch, has a multi-position switching function, realizes the flexible operation and maintenance of the power system, and contributes to the development of an intelligent power grid.

Claims

1. A multi-position isolating grounding switch, characterized in that: The switch body (3) is provided with four moving contacts (3.1), which are arranged in a cross shape, with an angle of 90% between them, and each moving contact (3.1) corresponds to a stationary contact, wherein three stationary contacts are isolating switch stationary contacts (4) arranged in three busbars (1), and one stationary contact is a grounding switch stationary contact (6); an isolating break (2) is provided between the moving contact (3.1) and the isolating switch stationary contact (4), and a grounding break (5) is provided between the moving contact (3.1) and the grounding switch stationary contact (6); Transmission racks (3.4) are provided on both sides of the moving contact (3.1); the transmission gear (3.4) on one side meshes with the closing gear and the interphase transmission member (3.3), and the transmission gear (3.4) on the other side meshes with the opening gear and the interphase transmission member (3.7); the closing gear and the interphase transmission member (3.3) or the opening gear and the interphase transmission member (3.7) are driven to rotate by the transmission mechanism (7), and the moving contact (3.1) can be inserted into or away from the corresponding static contact.

2. A multi-position isolating and grounding switch according to claim 1, characterized in that: The switch body (3) is installed inside the switch body through an insulating support rod (8), the switch body (3) comprises a support seat (3.6), the moving contact (3.1) is installed in an assembly groove of the support seat (3.6), a conductive contact finger (3.2) is provided on the outside of the moving contact (3.1) close to one end of the static contact, a closing transmission idle stroke (3.5) is provided at the end of a transmission rack (3.4) on one side of the moving contact (3.1), and an opening transmission idle stroke (3.8) is provided at the end of a transmission rack (3.4) on the other side of the moving contact (3.1).

3. The multi-position isolating and grounding switch according to claim 1, characterized in that: The transmission mechanism (7) comprises a driving motor (7.2), the driving motor (7.2) meshes with a closing ratchet gear (7.1) and a reversing gear set (7.4) through a speed change gear set (7.3), and the reversing gear set (7.4) meshes with an opening ratchet gear (7.5); the closing ratchet gear (7.1) drives the closing gear and the interphase transmission member (3.3), and the opening ratchet gear (7.5) drives the opening gear and the interphase transmission member (3.7).

4. A multi-position isolating and grounding switch according to claim 3, characterized in that: The closing gear and inter-phase transmission member (3.3) comprises three closing output gears (3.3.1), and the three closing output gears (3.3.1) and the closing output gears (3.3.1) and the closing ratchet gear (7.1) are connected via an inter-phase transmission insulating rod (3.9).

5. The multi-position isolating and grounding switch according to claim 3, characterized in that: The opening gear and inter-phase transmission member (3.7) comprises three opening output gears (3.7.1), and the three opening output gears (3.7.1) and the opening output gears (3.7.1) and the closing ratchet gear (7.1) are connected via inter-phase transmission insulating rods (3.9).

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