Miniaturized three-station isolation grounding switch for combined electric appliance

Abstract

The invention belongs to the technical field of high-voltage electrical equipment, and particularly relates to a miniaturized three-station isolation grounding switch for a combined electric appliance. The miniaturized three-station isolation grounding switch for the combined electric appliance comprises a shell in which a moving contact, an isolation static contact and a grounding static contact are arranged, and is characterized in that the moving contact is connected with a rack, the rack is meshed with a gear, the gear is fixed with an insulation shaft, the insulation shaft is driven by an output shaft, the output shaft is arranged in an operating mechanism, and the grounding static contact is arranged in the operating mechanism. The isolation static contact comprises an isolation static contact seat, and an isolation main contact and an arc striking contact higher than the isolation main contact are installed in the isolation static contact seat. The beneficial effects of the invention are that the compact structure design is adopted, and the size of the switch is effectively reduced. The electric shifting fork operating mechanism is adopted, linkage operation of the three-position switch is achieved, and operation is simple, convenient and reliable. Modularized design and high-quality materials are adopted, so that the mechanical life and the electrical performance of the switch are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage electrical equipment, and in particular relates to a miniaturized three-position isolating grounding switch for combined electrical appliances. Background Art

[0002] The development of power systems has placed higher demands on the size, performance, and reliability of 40.5kV combined electrical equipment. Traditional three-position isolating and grounding switches are bulky, complex to operate, and have low reliability, making them difficult to meet the modern power system's demand for miniaturization, intelligence, and high reliability. Summary of the Invention

[0003] In order to make up for the deficiencies of the prior art, the present invention provides a miniaturized three-position isolating grounding switch for a combination electrical appliance.

[0004] The present invention is achieved through the following technical solutions: A miniaturized three-position isolating and grounding switch for a combination electrical appliance comprises a housing, in which a moving contact, an isolating static contact, and a grounding static contact are arranged. The switch is characterized in that the moving contact is connected to a rack, the rack is meshed with a gear, the gear is fixed to an insulating shaft, the insulating shaft is driven by an output shaft, and the output shaft is mounted in an operating mechanism. The isolating static contact comprises an isolating static contact seat, in which an isolating main contact and an arcing contact higher than the isolating main contact are mounted.

[0005] The tops of the moving contact and the arcing contact are respectively provided with a copper-tungsten alloy layer.

[0006] The output shaft is fixed to the driving plate, a U-shaped groove is provided on the driving plate, a driving wheel is provided in the U-shaped groove, the driving wheel is mounted on the nut slider, the nut slider is mounted on the lead screw, and the lead screw is driven by the motor.

[0007] The lead screw is driven by a driven gear, the driven gear is meshed with a driving gear, and the driving gear is driven by a motor.

[0008] The moving contact is installed on the moving cutting conductor, the isolating static contact is installed on the isolating static cutting conductor, and the grounding static contact is installed on the grounding static cutting conductor.

[0009] The present invention offers the following advantages: a compact design effectively reduces the size of the switch; an electric fork operating mechanism enables coordinated operation of the three-position switch, resulting in simple and reliable operation; and a modular design and high-quality materials improve the mechanical life and electrical performance of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described below with reference to the accompanying drawings.

[0011] Attachment Figure 1 This is a schematic diagram of the main structure of the present invention; Attachment Figure 2 It is a side structural schematic diagram of the present invention; Attachment Figure 3 Schematic diagram of the internal transmission structure of the operating mechanism of the present invention; Attachment Figure 4 This is a schematic diagram of the arc-striking contact installation structure of the present invention; Attachment Figure 5 This is a schematic diagram of the power transmission structure of the moving contact of the present invention; In the figure, 1 is a housing, 2 is a moving contact, 3 isolating static contact, 4 is a grounding static contact, 5 is a rack, 6 is a gear, 7 is an insulating shaft, 8 is an output shaft, 9 is an operating mechanism, 10 isolating static contact seat, 11 isolating main contact, 12 is an arcing contact, 13 is a copper-tungsten alloy layer, 14 is a driving plate, 15 is a U-shaped groove, 16 is a driving wheel, 17 is a nut slider, 18 is a lead screw, 19 is a motor, 20 is a driven gear, 21 is a driving gear, 22 is a moving cutting conductor, 23 isolating static cutting conductor, 24 is a grounding static cutting conductor, and 25 is a moving contact seat. DETAILED DESCRIPTION

[0012] The accompanying drawings illustrate a specific embodiment of the present invention. This embodiment includes a housing 1, within which are disposed a movable contact 2, an isolating static contact 3, and a grounding static contact 4. The movable contact 2 is connected to a rack 5, which meshes with a gear 6, which is secured to an insulating shaft 7. The insulating shaft 7 is driven by an output shaft 8, which is mounted in an operating mechanism 9. The isolating static contact 3 includes an isolating static contact seat 10, within which are mounted an isolating main contact 11 and an arcing contact 12, which is higher than the isolating main contact 11.

[0013] The tops of the moving contact 2 and the arcing contact 12 are each provided with a copper-tungsten alloy layer 13. The output shaft 8 is fixed to a drive plate 14, which is provided with a U-shaped groove 15. A drive wheel 16 is located within the U-shaped groove 15. The drive wheel 16 is mounted on a nut slider 17, which is mounted on a lead screw 18, which is driven by a motor 19. The lead screw 18 is driven by a driven gear 20, which meshes with a driving gear 21, which is driven by the motor 19. The moving contact 2 is mounted on the moving cutting conductor 22, the isolating static contact 3 is mounted on the isolating static cutting conductor 23, and the grounding static contact 4 is mounted on the grounding static cutting conductor 24.

[0014] The miniaturized three-position isolating and grounding switch for the combined electrical appliance of the present invention is used, and the operating mechanism 9 adopts an electric fork operating mechanism. The output torque of the mechanism drives the three-phase moving contact 2 to perform opening and closing actions through the insulating shaft 7 of the side phase and the middle phase. When the moving contact 2 is in the middle position, the isolation and grounding are both in the open state. When the isolation is closed, the output shaft 8 rotates a fixed angle, drives the moving contact 2 to move downward, and inserts it into the isolating static contact seat 10 to complete the closing action. At this time, the grounding is opened. When the grounding is closed, the output shaft 8 rotates a fixed angle in the opposite direction, and the moving contact 2 moves upward and inserts it into the grounding static contact seat of the grounding static contact 4 to complete the grounding closing. At this time, the isolation is in the open position. In summary, the mechanical interlocking of the isolation and grounding can be realized to prevent misoperation and ensure safe operation.

[0015] During isolation closing, the motor 19 drives the lead screw 18 through the driving gear 21 and the driven gear 20, which in turn drives the nut slider 17 in linear motion. The drive wheel 16 of the nut slider 17 enters the U-shaped groove 15 of the drive plate 14, driving the output shaft 8 connected via the key to rotate a certain angle. After that, the drive wheel 16 of the nut slider 17 disengages the U-shaped groove 15 of the drive plate 14, and the output shaft 8 stops rotating. The same principle applies to opening, and any output angle can be achieved with the gear transmission. The principle of grounding closing and opening is the same as above.

[0016] During isolation and opening, the moving contact 2 and the arcing contact 12 are separated last, and the arc only burns the copper-tungsten alloy layer 13 of the moving contact 2 and the arcing contact 12, so as to reduce the burning loss and the generation of charged metal particles, which is beneficial to breaking and reduces the burning of the main contact by the arc root. The disconnector can obtain the breaking capacity of large current and high bus conversion voltage up to the rated bus current.

[0017] The rack 5 is installed in the moving contact 2. When opening and closing, the gear 6 drives the rack 5 to move along the axis of the guide sleeve to realize the opening and closing actions. The spur gear transmission structure is adopted to improve the transmission efficiency and reliability.

[0018] The miniaturized three-position isolating and grounding switch for combination electrical appliances of the present invention utilizes a welded housing 1, reducing costs. The dynamic cutting conductor 22, the isolating static cutting conductor 23, and the grounding static cutting conductor 24 are constructed from 50mm or 60mm thick aluminum sheets, cut and formed integrally using high-power laser cutting equipment. This avoids the long production cycle, high mold costs, and potential casting defects associated with cast conductors, resulting in a simple appearance and easy processing. The laser-cut conductors are made of 6063-T6 aluminum alloy, which offers higher conductivity and superior electrical performance than the ZL101A material commonly used for cast conductors.

Claims

1. A miniaturized three-position isolating and grounding switch for a combination electrical appliance, comprising a housing (1), wherein a movable contact (2), an isolating static contact (3) and a grounding static contact (4) are provided in the housing (1), and wherein: The movable contact (2) is connected to the rack (5), the rack (5) is meshed with the gear (6), the gear (6) is fixed to the insulating shaft (7), the insulating shaft (7) is driven by the output shaft (8), and the output shaft (8) is installed in the operating mechanism (9). The isolating static contact (3) includes an isolating static contact seat (10), and an isolating main contact (11) and an arc-strike contact (12) higher than the isolating main contact (11) are installed in the isolating static contact seat (10).

2. The miniaturized three-position isolating and grounding switch for combination electrical appliances according to claim 1 is characterized in that: A copper-tungsten alloy layer (13) is provided on the top of each of the moving contact (2) and the arc-striking contact (12).

3. The miniaturized three-position isolating and grounding switch for combination electrical appliances according to claim 1 is characterized in that: The output shaft (8) is fixed to the drive plate (14), a U-shaped groove (15) is provided on the drive plate (14), a drive wheel (16) is provided in the U-shaped groove (15), the drive wheel (16) is mounted on the nut slider (17), the nut slider (17) is mounted on the lead screw (18), and the lead screw (18) is driven by the motor (19).

4. The miniaturized three-position isolating and grounding switch for a combination electrical appliance according to claim 3, characterized in that: The lead screw (18) is driven by a driven gear (20), the driven gear (20) is meshed with a driving gear (21), and the driving gear (21) is driven by a motor (19).

5. The miniaturized three-position isolating and grounding switch for combination electrical appliances according to claim 1, characterized in that: The moving contact (2) is mounted on the moving cutting conductor (22), the isolating static contact (3) is mounted on the isolating static cutting conductor (23), and the grounding static contact (4) is mounted on the grounding static cutting conductor (24).

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