A high-voltage vacuum circuit breaker

Abstract

The application discloses a high-voltage vacuum circuit breaker, which has a control box and a solid-sealed pole connected with the control box, wherein an upper connecting arm and a lower connecting arm are arranged on the solid-sealed pole, an upper contact and a lower contact are arranged at the ends of the upper connecting arm and the lower connecting arm respectively, an arc-extinguishing chamber is arranged in the solid-sealed pole, a static contact is arranged above the arc-extinguishing chamber, and a movable contact is arranged below the arc-extinguishing chamber, a bellows is connected between the movable rod of the movable contact and the arc-extinguishing chamber, a shielding umbrella is fixedly arranged above the movable contact of the bellows, the shielding umbrella covers the bellows, a shielding cover is further arranged in the arc-extinguishing chamber, the upper part of the shielding cover is fixedly connected with the arc-extinguishing chamber, the upper half of the shielding cover is arranged as half of an ellipsoidal shell, and the lower half of the shielding cover is arranged as a cylindrical shell. The high-voltage vacuum circuit breaker is provided with a vacuum degree detector, a vibration monitor, a distance sensor and a controller. The application is accurate in judgment and improves the on-line detection capability of the high-voltage vacuum circuit breaker.

Description

Technical Field

[0001] This invention belongs to the field of circuit breakers, and specifically relates to a high-voltage vacuum circuit breaker. Background Technology

[0002] High-voltage circuit breakers are indispensable main control and protection equipment in power systems. Among them, vacuum circuit breakers have an absolute advantage in medium-voltage systems due to their advantages such as high breaking capacity, long maintenance cycle, no pollution, and no explosion hazard. They are widely used in the protection and control of power facilities in industrial and mining enterprises, power plants, and substations, switching various types of loads and in situations requiring frequent operation.

[0003] Existing technology application number CN201710774163.9, publication number CN107424866A, discloses a vacuum high-voltage circuit breaker and its operating method, including a circuit breaking chamber and a circuit breaking power chamber. The circuit breaking chamber has an upper support and a lower support, with a vacuum interrupter chamber between them. The vacuum interrupter chamber contains a stationary contact and a moving contact. An insulating cylinder covers the outside of the vacuum interrupter chamber. The upper end of the connecting rod of the stationary contact is connected and fixed to the upper support, and the lower end of the connecting rod of the moving contact passes through the lower support and is connected and fixed to a disc spring. An insulating pull rod is provided on the lower side of the disc spring. The circuit breaking power chamber houses the linkage drive mechanism of the circuit breaker of this invention, which features a compact structure and rapid response. The transmission structure of this invention is compact, tightly connected, and occupies little space. It has a fast response speed during opening and closing, and can achieve precise control of mechanical movement. The opening and closing drive mechanism of this invention is an integrated structure, with one system realizing two functions, saving both cost and space, and is suitable for practical application.

[0004] With increasingly stringent requirements for power supply stability and reliability, in order to minimize system maintenance cycles and failure frequencies, it is necessary to add measuring and detection components to vacuum circuit breakers to enable timely and accurate knowledge of their status. Summary of the Invention

[0005] In view of the above-mentioned technical problems, the present invention provides a high-voltage vacuum circuit breaker that can solve the problems in the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A high-voltage vacuum circuit breaker includes a control box 1 and a solid-sealed pole 2 connected to the control box 1. An upper connecting arm 3 and a lower connecting arm 4 are provided on the solid-sealed pole 2. An upper contact 5 and a lower contact 6 are respectively provided at the ends of the upper connecting arm 3 and the lower connecting arm 4. An arc-extinguishing chamber 7 is provided inside the solid-sealed pole 2. A stationary contact 8 is located above the arc-extinguishing chamber 7, and a moving contact 9 is located below the arc-extinguishing chamber 7. A bellows 10 is connected between the moving rod of the moving contact 9 and the arc-extinguishing chamber 7. A shielding umbrella 13 is fixedly provided above the bellows 10 and covers the bellows 10. A shielding cover 12 is also provided inside the arc-extinguishing chamber 7. The upper part of the shielding cover 12 is shaped like half of an ellipsoidal shell, and the lower part of the shielding cover 12 is cylindrical.

[0008] Furthermore, the shielding cover 12 is disposed above the shielding umbrella 13, and the diameter of the lower half of the shielding cover 12 is smaller than the diameter of the shielding umbrella 13; the moving rod of the moving contact 9 is connected to an insulating pull rod 11, and the stationary contact 8 and the moving contact 9 have the same structure, with a plurality of evenly distributed arc-shaped grooves 14 provided on the contact surface.

[0009] Furthermore, the high-voltage vacuum circuit breaker is also equipped with,

[0010] A vacuum level detector, which is used to obtain the vacuum level in the arc-extinguishing chamber in real time;

[0011] A vibration monitor, which is used to measure the vibration data of the arc-extinguishing chamber in real time;

[0012] Distance sensor, the distance sensor being used to acquire the distance the lever has moved;

[0013] The controller calculates the status of the high-voltage vacuum circuit breaker based on vacuum level, vibration data, and movement distance.

[0014] Furthermore, the controller includes a vacuum degree calculation module, and the vacuum degree calculation module calculates the vacuum degree as follows:

[0015] Obtain the vacuum degree P during the non-switching process measured by the vacuum degree detector. a,i (i = 1, 2, ..., n), obtain the vacuum degree P during the switching process measured by the vacuum degree detector. b,j (j = 1, 2, ...

[0016] n);

[0017] in

[0018] f a(i) represents the change in vacuum during the non-interruption process. If the subsequent measurement value is less than the previous measurement value, it is recorded as 0.

[0019] in

[0020] f b (j) represents the change in vacuum during the switching process. If the subsequent measurement value is less than the previous measurement value, it is recorded as 0.

[0021] Calculate the rate of change of vacuum degree Q during the non-interruption process and the rate of change of vacuum degree Q during the interruption process, respectively. a,i and Q b,j ,

[0022]

[0023] Δt a,i Indicates the measured value P a,i and P a,i-1 The accumulated time during the non-interruption process, Δt b,j Indicates the measured value P b,j and P b,j-1 The accumulated time during the interruption process;

[0024] According to the vacuum degree change rate Q a,i and Q b,j Determine the rate at which the high-voltage vacuum circuit breaker fails due to changes in vacuum pressure during both the non-breaking and breaking processes.

[0025] Furthermore, considering that the changes in vacuum degree caused by the non-suspension process and the suspension process are mutually influential, an expression for the vacuum degree influence factor is established.

[0026]

[0027] Where λ1 and λ2 are influence constants, and 0≤λ1≤1, 0≤λ2≤1, 0.8≤λ1+λ2≤1; the vacuum degree calculation module is based on... To determine the impact of changes in vacuum level on the reliability of high-voltage vacuum circuit breakers.

[0028] Furthermore, the controller includes a vibration calculation module. This module stores standard vibration data for the opening and closing of the high-voltage vacuum circuit breaker under normal operating conditions. It also acquires measured vibration data from the vibration monitor during actual operation of the high-voltage vacuum circuit breaker during opening and closing. The standard vibration data and measured vibration data are then processed using the EMD decomposition method to obtain the IMF component, denoted as [missing information].

[0029] Normal value A during circuit breaker tripping 分闸正常 =[a 分闸正常1 a 分闸正常2 a分闸正常3 a 分闸正常总 ]

[0030] Normal value A when closing 合闸正常 =[a 合闸正常1 a 合闸正常2 a 合闸正常3 a 合闸正常总 ]

[0031] A 分闸实测 =[a 分闸实测1 a 分闸实测2 a 分闸实测3 a 分闸实测总 ]

[0032] A 合闸实测 =[a 合闸实测1 a 合闸实测2 a 合闸实测3 a 合闸实测总 ]

[0033] Calculate the normal value range for opening and closing the circuit breaker respectively.

[0034] A′ 分闸正常 =[a′ 分闸正常1 ,a′ 分闸正常2 ,a′ 分闸正常3 ,a′ 分闸正常总 ]

[0035] A′ 合闸正常 =[a′ 合闸正常1 ,a′ 合闸正常2 ,a′ 合闸正常3 ,a′ 合闸正常总 ]

[0036] Calculate the ratio of each component separately.

[0037]

[0038] Calculate the degree of difference of the ratios based on the ratios of each component.

[0039] The vibration calculation module compares σ 分闸 2 and σ′ 分闸 2 σ 合闸 2 and σ′ 合闸 2 Size, if σ 分闸 2 >σ′ 分闸 2 Abnormal tripping; if σ 合闸 2 >σ′ 合闸2 The circuit breaker failed to close.

[0040] Furthermore, the controller has a distance sensor to measure Δt when the circuit is closed. 合,1 The corresponding distance S 合,1 Δt 合,2 The corresponding distance S 合,2 ……Δt 合,n The corresponding distance S 合,n Δt during circuit breaker tripping 分,1 The corresponding distance S 分,1 Δt 分,2 The corresponding distance S 分,2 ……Δt 分,n The corresponding distance S 分,n Based on the above measurements, the following speeds were calculated respectively.

[0041]

[0042] The standard deviations of a single closing and opening circuit are respectively

[0043]

[0044] Let σ be the standard deviation of m closing and opening cycles. 合闸,l and σ 分闸,l l = 1, 2...m; introduce coefficient γ 合,l and γ 分,l ,

[0045]

[0046]

[0047] Calculate the impact factor

[0048]

[0049] Where v 合l,i v is the velocity of the i-th opening phase during the l-th closing process. 分l,i v is the speed at the i-th tripping moment during the l-th tripping process. 合l,平均 v 分l,平均 Let i = 1, 2, ..., n, l = 1, 2, ..., m, and let max(λ) be the average velocity during the l-th closing and opening processes. 合 , λ 分 The determination of whether to close or open the circuit breaker has a significant impact on the circuit breaker.

[0050] The present invention has the following technical effects:

[0051] 1. The present invention is provided with a shielding cover and a shielding umbrella. The shielding umbrella is located below the shielding cover, and the diameter of the shielding umbrella is larger than the diameter of the shielding cover, which can protect the bellows and improve the service life of the bellows; the present invention has grooves on the contacts, which can achieve the effect of rapid arc extinguishing.

[0052] 2. This invention is equipped with a vacuum degree detector, which measures the vacuum degree in real time during the non-breaking process and the breaking process, calculates the rate of change of vacuum degree, and judges the influence of the process; it establishes an expression for the vacuum degree influence factor, which can clearly understand the impact of the change of vacuum degree on the high-voltage vacuum circuit breaker.

[0053] 3. The present invention is equipped with a vibration monitor to acquire monitoring data, and uses the EMD decomposition method to obtain the IMF component to determine whether the circuit breaker is closed or opened abnormally.

[0054] 4. A distance sensor is installed to monitor the moving distance and calculate the moving speed. At the same time, a speed influence factor is introduced to determine whether the circuit breaker is closed or opened, which has a significant impact on the circuit breaker.

[0055] This invention provides accurate judgment and improves the online detection capability of high-voltage vacuum circuit breakers. Attached Figure Description

[0056] Figure 1 A schematic diagram of the high-voltage vacuum circuit breaker of the present invention;

[0057] Figure 2 A schematic diagram of the internal structure of the solid-sealed pole of the high-voltage vacuum circuit breaker of this invention;

[0058] Figure 3 A schematic diagram of the contacts of the high-voltage vacuum circuit breaker of the present invention;

[0059] The diagram shows: 1. Control box; 2. Solid-sealed pole; 3. Upper connecting arm; 4. Lower connecting arm; 5. Upper contact; 6. Lower contact; 7. Arc extinguishing chamber; 8. Stationary contact; 9. Moving contact; 10. Bellows; 11. Insulating tie rod; 12. Shielding cover; 13. Shielding umbrella; 14. Arc groove. Detailed Implementation

[0060] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0061] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0063] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0064] This invention discloses a high-voltage vacuum circuit breaker. To improve the safety of the high-voltage vacuum circuit breaker, it is equipped with a vacuum degree detector for real-time acquisition of the vacuum degree in the arc-extinguishing chamber; a vibration monitor for real-time measurement of vibration data in the arc-extinguishing chamber; a distance sensor for acquiring the movement distance of the moving rod; and a controller for calculating the state of the high-voltage vacuum circuit breaker based on the vacuum degree, vibration data, and movement distance.

[0065] The controller is a key component for data analysis in this invention, and it includes a vacuum degree calculation module, a vibration calculation module, a distance sensor, and a velocity calculation module.

[0066] The functions of each module of the controller are as follows:

[0067] (1) The vacuum degree calculation module is used to calculate the vacuum degree inside the high-voltage vacuum circuit breaker in real time. The calculation method of the vacuum degree calculation module is as follows:

[0068] Obtain the vacuum degree P during the non-switching process measured by the vacuum degree detector. a,i (i = 1, 2, ..., n), obtain the vacuum degree P during the switching process measured by the vacuum degree detector. b,j (j = 1, 2, ..., n);

[0069] in

[0070] f a (i) represents the change in vacuum during the non-interruption process. If the subsequent measurement value is less than the previous measurement value, it is recorded as 0.

[0071] in

[0072] f b (j) represents the change in vacuum during the switching process. If the subsequent measurement value is less than the previous measurement value, it is recorded as 0.

[0073] Calculate the rate of change of vacuum degree Q during the non-interruption process and the rate of change of vacuum degree Q during the interruption process, respectively. a,i and Q b,j ,

[0074]

[0075] Δt a,i Indicates the measured value P a,i and P a,i-1 The accumulated time during the non-interruption process, Δt b,j Indicates the measured value P b,j and P b,j-1 The accumulated time during the interruption process;

[0076] According to the vacuum degree change rate Q a,i and Q b,j Determine the rate at which the high-voltage vacuum circuit breaker fails due to changes in vacuum pressure during both the non-breaking and breaking processes.

[0077] Furthermore, considering that the changes in vacuum degree caused by the non-suspension process and the suspension process are mutually influential, an expression for the vacuum degree influence factor is established.

[0078]

[0079] Where λ1 and λ2 are influence constants, and 0≤λ1≤1, 0≤λ2≤1, 0.8≤λ1+λ2≤1; the vacuum degree calculation module is based on... To determine the impact of changes in vacuum level on the reliability of high-voltage vacuum circuit breakers.

[0080] (2) The vibration calculation module is used to calculate the ratio difference degree based on the measured vibration data. The vibration calculation module stores standard vibration data for opening and closing of the high-voltage vacuum circuit breaker under normal operating conditions. The module also acquires the measured vibration data of the high-voltage vacuum circuit breaker during actual operation (opening and closing) monitored by the vibration monitor. The IMF component is obtained from the standard vibration data and the measured vibration data using the EMD decomposition method, denoted as .

[0081] Normal value A during circuit breaker tripping 分闸正常 =[a 分闸正常1 a 分闸正常2 a 分闸正常3 a 分闸正常总 ]

[0082] Normal value A when closing 合闸正常 =[a 合闸正常1 a 合闸正常2 a 合闸正常3 a 合闸正常总 ]

[0083] A 分闸实测 =[a 分闸实测1 a 分闸实测2 a 分闸实测3 a 分闸实测总 ]

[0084] A 合闸实测 =[a 合闸实测1 a 合闸实测2 a 合闸实测3 a 合闸实测总 ]

[0085] Calculate the normal value range for opening and closing the circuit breaker respectively.

[0086] A′ 分闸正常 =[a′ 分闸正常1 ,a′ 分闸正常2 ,a′ 分闸正常3 ,a′ 分闸正常总 ]

[0087] A′ 合闸正常 =[a′ 合闸正常1 ,a′ 合闸正常2 ,a′ 合闸正常3 ,a′ 合闸正常总 ]

[0088] Calculate the ratio of each component separately.

[0089]

[0090]

[0091] Calculate the degree of difference of the ratios based on the ratios of each component.

[0092]

[0093] The vibration calculation module compares σ 分闸 2 and σ′ 分闸 2 σ 合闸 2 and σ′ 合闸2 Size, if σ 分闸 2 >σ′ 分闸 2 Abnormal tripping; if σ 合闸 2 >σ′ 合闸 2 The circuit breaker failed to close.

[0094] (3) The distance sensor and speed calculation module calculate the speed based on the measured amount of movement and the time of movement, and also has the function of calculating the speed influence factor.

[0095] Measuring Δt during closing 合,1 The corresponding distance S 合,1 Δt 合,2 The corresponding distance S 合,2 ……Δt 合,n The corresponding distance S 合,n Δt during circuit breaker tripping 分,1 The corresponding distance S 分,1 Δt 分,2 The corresponding distance S 分,2 ……Δt 分,n The corresponding distance S 分,n Based on the above measurements, the following speeds were calculated respectively.

[0096]

[0097]

[0098] The standard deviations of a single closing and opening circuit are respectively

[0099]

[0100] Let σ be the standard deviation of m closing and opening cycles. 合闸,l and σ 分闸,l l = 1, 2...m; introduce coefficient γ 合,l and γ 分,l ,

[0101]

[0102] Calculate the impact factor

[0103]

[0104] Where v 合l,i v is the velocity of the i-th opening phase during the l-th closing process. 分l,i v is the speed at the i-th tripping moment during the l-th tripping process. 合l,平均 v 分l,平均Let i = 1, 2, ..., n, l = 1, 2, ..., m, and let max(λ) be the average velocity during the l-th closing and opening processes. 合 , λ 分 The determination of whether to close or open the circuit breaker has a significant impact on the circuit breaker.

[0105] refer to Figure 1-3 The high-voltage vacuum circuit breaker including the above-mentioned measurement and calculation module has a control box 1 and a solid-sealed pole 2 connected to the control box 1. An upper connecting arm 3 and a lower connecting arm 4 are provided on the solid-sealed pole 2. An upper contact 5 and a lower contact 6 are respectively provided at the ends of the upper connecting arm 3 and the lower connecting arm 4. An arc-extinguishing chamber 7 is provided inside the solid-sealed pole 2. A stationary contact 8 is provided above and a moving contact 9 is provided below inside the arc-extinguishing chamber 7. A bellows 10 is connected between the moving rod of the moving contact 9 and the arc-extinguishing chamber 7. A shielding umbrella 13 is fixedly provided above the bellows 10 and the connection of the moving contact 9. The shielding umbrella 13 covers the bellows 10. A shielding cover 12 is also provided inside the arc-extinguishing chamber 10. The upper part of the shielding cover 12 is fixedly connected to the arc-extinguishing chamber 7, and the upper half of the shielding cover 12 is set as half of an ellipsoidal shell, and the lower half of the shielding cover 12 is set as a cylinder. The shielding cover 12 is disposed above the shielding umbrella 13, and the diameter of the lower half of the shielding cover 12 is smaller than the diameter of the shielding umbrella 13; the moving rod of the moving contact 9 is connected to an insulating pull rod 11, and the stationary contact 8 and the moving contact 9 have the same structure, with a plurality of evenly distributed arc-shaped grooves 14 provided on the contact surface.

[0106] The present invention has the following technical effects:

[0107] 1. The present invention is provided with a shielding cover and a shielding umbrella. The shielding umbrella is located below the shielding cover, and the diameter of the shielding umbrella is larger than the diameter of the shielding cover, which can protect the bellows and improve the service life of the bellows; the present invention has grooves on the contacts, which can achieve the effect of rapid arc extinguishing.

[0108] 2. This invention is equipped with a vacuum degree detector, which measures the vacuum degree in real time during the non-breaking process and the breaking process, calculates the rate of change of vacuum degree, and judges the influence of the process; it establishes an expression for the vacuum degree influence factor, which can clearly understand the impact of the change of vacuum degree on the high-voltage vacuum circuit breaker.

[0109] 3. The present invention is equipped with a vibration monitor to acquire monitoring data, and uses the EMD decomposition method to obtain the IMF component to determine whether the circuit breaker is closed or opened abnormally.

[0110] 4. A distance sensor is installed to monitor the moving distance and calculate the moving speed. At the same time, a speed influence factor is introduced to determine whether the circuit breaker is closed or opened, which has a significant impact on the circuit breaker.

[0111] This invention provides accurate judgment and improves the online detection capability of high-voltage vacuum circuit breakers.

[0112] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-voltage vacuum circuit breaker, comprising a control box (1) and a solid-sealed pole (2) connected to the control box (1), wherein an upper connecting arm (3) and a lower connecting arm (4) are provided on the solid-sealed pole (2), and an upper contact (5) and a lower contact (6) are respectively provided at the ends of the upper connecting arm (3) and the lower connecting arm (4), wherein an arc-extinguishing chamber (7) is provided inside the solid-sealed pole (2), and a stationary contact (8) located above and a moving contact (9) located below are provided inside the arc-extinguishing chamber (7), characterized in that: A bellows (10) is connected between the moving rod of the moving contact (9) and the arc-extinguishing chamber (7). A shielding umbrella (13) is fixedly installed on the connection of the moving contact (9) above the bellows (10). The shielding umbrella (13) covers the bellows (10). A shielding cover (12) is also installed inside the arc-extinguishing chamber (7). The upper part of the shielding cover (12) is fixedly connected to the arc-extinguishing chamber (7). The upper half of the shielding cover (12) is set as half of an ellipsoidal shell, and the lower half of the shielding cover (12) is set as a cylinder. The high-voltage vacuum circuit breaker is equipped with a vacuum degree detector, a vibration monitor, a distance sensor, and a controller. The vacuum degree detector is used to acquire the vacuum degree in the arc-extinguishing chamber in real time. The vibration monitor is used to measure the vibration data of the arc-extinguishing chamber in real time. The distance sensor is used to acquire the moving distance of the moving rod. The controller calculates the state of the high-voltage vacuum circuit breaker based on the vacuum degree, vibration data, and moving distance. The controller has a vacuum degree calculation module, and the vacuum degree calculation module calculates the vacuum degree as follows. Obtain the vacuum degree P during the non-switching process measured by the vacuum degree detector. a,i Let i = 1, 2, ..., n, and obtain the vacuum degree P during the switching process measured by the vacuum degree detector. b,j j = 1, 2, ..., n; in f a (i) represents the change in vacuum during the non-interruption process. If the subsequent measurement value is less than the previous measurement value, it is recorded as 0. in f b (j) represents the change in vacuum during the switching process. If the subsequent measurement value is less than the previous measurement value, it is recorded as 0. Calculate the rate of change of vacuum degree Q during the non-interruption process and the rate of change of vacuum degree Q during the interruption process, respectively. a,i WaQ n,j , Δt a,i Indicates the measured value P a,i and P a,i-1 The accumulated time during the non-interruption process, Δt b,j Indicates the measured value P b,j and P b,j-1 The accumulated time during the interruption process; According to the vacuum degree change rate Q a,i and Q b,j Determine the rate at which the high-voltage vacuum circuit breaker fails due to changes in vacuum pressure during both the non-breaking and breaking processes. Considering that the changes in vacuum degree caused by the non-suspension process and the suspension process are mutually influential, an expression for the vacuum degree influence factor is established. Where λ1 and λ2 are influence constants, and 0≤λ1≤1, 0≤λ2≤1, 0.8≤λ1+λ2≤1; the vacuum degree calculation module is based on... To determine the impact of changes in vacuum level on the reliability of high-voltage vacuum circuit breakers.

2. A high-voltage vacuum circuit breaker according to claim 1, characterized in that: The shielding cover (12) is positioned above the shielding umbrella (13), and the diameter of the lower half of the shielding cover (12) is smaller than the diameter of the shielding umbrella (13); the moving rod of the moving contact (9) is connected to an insulating pull rod (11), and the stationary contact (8) and the moving contact (9) have the same structure, with a plurality of evenly distributed arc-shaped grooves (14) on the contact surface.

3. A high-voltage vacuum circuit breaker according to claim 2, characterized in that: The controller has a vibration calculation module that stores standard vibration data for opening and closing of the high-voltage vacuum circuit breaker under normal operating conditions. The module also acquires measured vibration data of the high-voltage vacuum circuit breaker during actual operation (opening and closing) monitored by the vibration monitor. The standard vibration data and measured vibration data are then processed using the EMD decomposition method to obtain the IMF component, denoted as [missing information]. Normal value A during circuit breaker tripping 分闸正常 =[a 分闸正常1 a 分闸正常2 a 分闸正常3 a 分闸正常总 ] Normal value A when closing 合闸正常 =[a 合闸正常1 a 合闸正常2 a 合闸正常3 a 合闸正常总 ] A 分闸实测 =[a 分闸实测1 ,a 分闸实测2 ,a 分闸实测3 ,a 分闸实测总 ] A 合闸实测 =[a 合闸实测1 ,a 合闸实测2 ,a 合闸实测3 ,a 合闸实测总 ] Calculate the normal value range for opening and closing the circuit breaker respectively. A′ 分闸正常 =[a′ 分闸正常1 ,a′ 分闸正常2 ,a′ 分闸正常3 ,a′ 分闸正常总 ] A′ 合闸正常 =[a′ 合闸正常1 ,a′ 合闸正常2 ,a′ 合闸正常3 ,a′ 合闸正常总 ] Calculate the ratio of each component separately. Calculate the degree of difference of the ratios based on the ratios of each component. The vibration calculation module compares σ 分闸 2 and σ′ 分闸 2 σ 合闸 2 and σ′ 合闸 2 Size, if σ 分闸 2 >σ′ 分闸 2 Abnormal tripping; if σ 合闸 2 >σ′ 合闸 2 The circuit breaker failed to close.

4. A high-voltage vacuum circuit breaker according to claim 3, characterized in that: The controller has a distance sensor that measures Δt when the circuit is closed. 合,1 The corresponding distance S 合,1 Δt 合,2 The corresponding distance S 合,2 ……Δt 合,n The corresponding distance S 合,n Δt during circuit breaker tripping 分,1 The corresponding distance S 分,1 Δt 分,2 The corresponding distance S 分,2 ……Δt 分,n The corresponding distance S 分,n Based on the above measurements, the following speeds were calculated respectively. The standard deviations of a single closing and opening circuit are respectively Let σ be the standard deviation of m closing and opening cycles. 合闸,l and σ 分闸,l l = 1, 2...m; introduce coefficient γ 合,l and γ 分,l , Calculate the impact factor Where v 合l,i v is the velocity of the i-th opening phase during the l-th closing process. 分l,i v is the speed at the i-th tripping moment during the l-th tripping process. 合l,平均 v 分l,平均 Let i = 1, 2, ..., n, l = 1, 2, ..., m, and let max(λ) be the average velocity during the l-th closing and opening processes. 合 , λ 分 The determination of whether to close or open the circuit breaker has a significant impact on the circuit breaker.

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