Low-partial-discharge indoor high-voltage vacuum circuit breaker
By designing structures such as insulating plates, vacuum tubes, blade contacts, and protective covers in vacuum circuit breakers, the partial discharge problem was solved, realizing a high-voltage vacuum circuit breaker with low partial discharge, thus improving the safety and reliability of the equipment.
Patent Information
- Application Number
- CN202423268799.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Vacuum circuit breakers are prone to partial discharge when in the conducting state, which can lead to dangerous equipment use.
The design incorporates an insulating plate and vacuum tube, combined with blade-type moving contacts, stationary contacts, and an isolation protective cover. The isolation mechanism reduces partial discharge between contacts and in high-voltage equipment. The equalizing ring distributes high voltage evenly, and the sheath and isolation wall divide the moving contact mounting cavity to ensure stability and isolation effect.
It effectively reduces partial discharge, lowers the risk of equipment burnout, and improves the safety and reliability of the equipment.
Smart Images
Figure CN223651315U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power equipment, and in particular relates to a vacuum circuit breaker. Background Technology
[0002] A vacuum circuit breaker is named for its high-vacuum arc-extinguishing medium and the high-vacuum insulation medium between the contacts after arc extinguishing. The structure of a vacuum circuit breaker includes: opposing insulating plates and three-phase vacuum tubes installed between the insulating plates. Two rotatable blade-type moving contacts are located at the upper end of the vacuum tubes. Side plates are connected to both sides of the insulating plates. The side plates have an upper crossbeam at the upper end, a square shaft in the middle, and a grounding beam at the lower end. A crank arm on the square shaft drives the blade-type moving contacts to rotate. A blade-type stationary contact is located on the upper crossbeam, and a grounding stationary contact is located on the grounding beam. When the vacuum circuit breaker is in the conducting state, high voltage is generated between its contacts and at the connection points with high-voltage equipment, which can easily lead to partial discharge (PD), posing a danger to the equipment. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a low partial discharge indoor high voltage vacuum circuit breaker.
[0004] To solve the above problems, the technical solution adopted by this utility model includes: an insulating plate arranged opposite to each other and a vacuum tube installed between the insulating plates in a three-phase distribution. The upper end of the vacuum tube is provided with two rotatable blade-type moving contacts. Side plates are connected to both sides of the insulating plate. The upper end of the side plate is provided with an upper crossbeam, the middle part is provided with a square shaft, and the lower end is provided with a grounding beam. The square shaft is provided with a crank arm that drives the blade-type moving contacts to rotate. The upper crossbeam is provided with a blade-type stationary contact, and the grounding beam is provided with a grounding stationary contact. The characteristic is that: the middle part of the blade-type moving contact is provided with a protective sleeve, the front end of the crank arm is hinged to the protective sleeve, the insulating plate is provided with a lower partition plate corresponding to the vacuum tube, and the upper end of the lower partition plate is provided with an upper isolation part extending to the protective sleeve. The lower end of the upper crossbeam is provided with an upper partition plate corresponding to both sides of the blade-type stationary contact, and the front end of the side plate is provided with an isolation protective cover covering the blade-type moving contact and the grounding stationary contact.
[0005] The low partial discharge indoor high voltage vacuum circuit breaker is characterized in that: the grounding beam has an L-shaped cross-section, the grounding stationary contact is installed on the lower edge of the grounding beam, and the lower end of the isolation protective cover is connected to the upper edge of the grounding beam.
[0006] The low partial discharge indoor high voltage vacuum circuit breaker is characterized in that: each of the oppositely arranged insulating plates is provided with a wire outlet, and the lower end of the vacuum tube is connected to a flexible connecting wire led out from the wire outlet, and the adjacent flexible connecting wires face opposite directions.
[0007] The low partial discharge indoor high voltage vacuum circuit breaker is characterized in that: an equalizing ring is provided at the rear end of the blade-type stationary contact.
[0008] The low partial discharge indoor high voltage vacuum circuit breaker is characterized in that: the sheath is divided into independently spaced moving contact mounting cavities by an intermediate isolation wall, and the sheath is provided with pin holes at both ends and a shaft hole in the middle.
[0009] The low partial discharge indoor high voltage vacuum circuit breaker is characterized in that: the intermediate isolation wall is provided with a support rib supporting the blade-type moving contact.
[0010] The low partial discharge indoor high voltage vacuum circuit breaker is characterized in that: the lower end of the lower partition plate is provided with a lower isolation part extending to the space between the flexible connecting wires.
[0011] The advantages of this low partial discharge indoor high-voltage vacuum circuit breaker are as follows: isolation mechanisms are provided between each contact and between the contact and high-voltage equipment, which can greatly reduce the partial discharge phenomenon.
[0012] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description
[0013] Figure 1 This is a cross-sectional view of the low partial discharge indoor high voltage vacuum circuit breaker of this utility model;
[0014] Figure 2 yes Figure 1 Sectional view along axis AA;
[0015] Figure 3 This is a schematic diagram of the equalizing ring of this utility model;
[0016] Figure 4 This is a schematic diagram of the structure of the sheath of this utility model;
[0017] Figure 5 yes Figure 4 BB-direction sectional view;
[0018] Figure 6 This is a schematic diagram of the structure of the lower partition of this utility model;
[0019] Figure 7 This is a partially enlarged view of the low partial discharge indoor high voltage vacuum circuit breaker of this utility model. Detailed Implementation
[0020] Reference Figure 1-7As shown, the low partial discharge indoor high-voltage vacuum circuit breaker of this utility model includes an insulating plate 1 arranged opposite to each other and a vacuum tube 2 installed between the insulating plates 1 in a three-phase distribution. Two rotatable blade-type moving contacts 3 are provided at the upper end of the vacuum tube 2, and side plates 4 are connected to both sides of the insulating plate 1. An upper crossbeam 5 is provided at the upper end of the side plate 4, a square shaft 6 is provided in the middle of the side plate 4, and a grounding beam 7 is provided at the lower end of the side plate 4. A crank arm 8 that drives the blade-type moving contacts 3 to rotate is provided on the square shaft 6. A blade-type stationary contact 9 is provided on the upper crossbeam 5. A grounding stationary contact 10 is provided on the grounding beam 7. When closing: the blade-type moving contacts 3 and the blade-type stationary contacts 9 are closed; when opening: the blade-type moving contacts 3 and the grounding stationary contact 10 are closed. A sheath 11 is provided in the middle of the blade-type moving contacts 3, and the sheath 11 is made of insulating plastic. The front end of the crank arm 8 is hinged to the sheath 11. The insulating plate 1 is provided with a lower partition 12 between the vacuum tube 2 and the upper end of the lower partition 12 is provided with an upper isolation part 25 extending to the sheath 11. The lower end of the upper crossbeam 5 is provided with upper partitions 13 on both sides of the blade-type stationary contact (9). The front end of the side plate 4 is provided with an isolation protective cover 14 covering the blade-type moving contact 3 and the grounding stationary contact 10.
[0021] Preferably, the grounding beam 7 has an L-shaped cross-section, the grounding stationary contact 10 is installed on the lower edge 16 of the grounding beam 7, and the lower end of the isolation protective cover 14 is connected to the upper edge 17 of the grounding beam 7. This facilitates the installation of the grounding stationary contact 10 and the isolation protective cover 14.
[0022] Preferably, each of the oppositely arranged insulating plates 1 is provided with a wire outlet 18, and the lower end of the vacuum tube 2 is connected to a flexible connecting wire 15 led out from the wire outlet 18, and the adjacent flexible connecting wires 15 face opposite directions, thereby preventing discharge between adjacent flexible connecting wires 15.
[0023] Preferably, the blade-type stationary contact 9 has an equalizing ring 19 at its rear end. The equalizing ring 19 is ideally made of aluminum. The equalizing ring 19 can evenly distribute high voltage around the object, ensuring that there is no potential difference between the different parts of the ring, thereby achieving the effect of equalizing voltage, reducing the generation of electric arcs, and lowering the risk of equipment burnout.
[0024] Preferably, the sheath 11 is divided into independently spaced moving contact mounting cavities 21 by a central partition wall 20. The sheath 11 has pin holes 22 at both ends and a shaft hole 23 in the middle. This allows for the independent installation of the two blade-type moving contacts 3. A pin is inserted into the pin hole 22 to connect with the blade-type moving contact 3. The shaft hole 23 provides a rotatable connection with the crank arm 8.
[0025] Preferably, the intermediate isolation wall 20 is provided with support ribs 24 to support the blade-type moving contact 3, so as to improve the stability of the blade-type moving contact 3 after installation.
[0026] Preferably, the lower partition 12 has a lower isolation portion 26 extending to the space between the flexible connecting wires 18. In some cases, it is necessary for the flexible connecting wires 18 to be installed on the same side. In this case, the lower isolation portion 26 is used to achieve isolation between the flexible connecting wires 18.
[0027] The above description is not intended to limit the present invention in any way. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A low partial discharge indoor high-voltage vacuum circuit breaker, comprising an insulating plate (1) arranged opposite to each other and a vacuum tube (2) installed between the insulating plates (1) in a three-phase distribution, wherein the upper end of the vacuum tube (2) is provided with two rotatable blade-type moving contacts (3), and side plates (4) are connected to both sides of the insulating plate (1). The side plate (4) is provided with an upper crossbeam (5) at its upper end, a square shaft (6) in its middle, and a grounding beam (7) at its lower end. The square shaft (6) is provided with a crank arm (8) that drives the blade-type moving contacts (3) to rotate. The upper crossbeam (5) is provided with a blade-type stationary contact (9), and the grounding beam (7) is provided with a grounding stationary contact (10). The circuit breaker is characterized in that: The blade-type moving contact (3) is provided with a sheath (11) in the middle. The front end of the crank arm (8) is hinged to the sheath (11). The insulating plate (1) is provided with a lower partition (12) between the vacuum tube (2) and the upper end of the lower partition (12) is provided with an upper isolation part (25) extending to the sheath (11). The lower end of the upper crossbeam (5) is provided with an upper partition (13) on both sides of the blade-type stationary contact (9). The front end of the side plate (4) is provided with an isolation protective cover (14) covering the blade-type moving contact (3) and the grounding stationary contact (10).
2. The low partial discharge indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: The grounding beam (7) has an L-shaped cross section. The grounding stationary contact (10) is installed on the lower edge (16) of the grounding beam (7). The lower end of the isolation protective cover (14) is connected to the upper edge (17) of the grounding beam (7).
3. The low partial discharge indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: Each of the oppositely arranged insulating plates (1) is provided with a wire outlet (18), and the lower end of the vacuum tube (2) is connected to a flexible connecting wire (15) led out from the wire outlet (18), and the adjacent flexible connecting wires (15) face opposite directions.
4. The low partial discharge indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: The blade-type stationary contact (9) is provided with an equalizing ring (19) at its rear end.
5. The low partial discharge indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that: The sheath (11) is divided into moving contact mounting cavities (21) with independent intervals by the intermediate partition wall (20). The sheath (11) has pin holes (22) at both ends and a shaft hole (23) in the middle.
6. The low partial discharge indoor high-voltage vacuum circuit breaker according to claim 5, characterized in that: The intermediate isolation wall (20) is provided with a support rib (24) supporting the blade-type moving contact (3).
7. The low partial discharge indoor high-voltage vacuum circuit breaker according to claim 3, characterized in that: The lower end of the lower partition (12) is provided with a lower isolation portion (26) extending between the flexible connecting wires (18).