Vacuum gap switch control method, control mechanism and direct current circuit breaker

Abstract

This application discloses a vacuum gap switch control method, a control mechanism, and a DC circuit breaker, relating to the field of power electronics technology. The vacuum gap switch control method includes: receiving an opening command sent by a main control system; and, in response to the opening command, controlling the moving contact of the vacuum gap switch to move at a first speed in a first direction to increase the opening distance between the moving contact and the stationary contact of the vacuum gap switch; wherein the first direction is the direction away from the stationary contact. According to the scheme disclosed in this application, the insulation recovery requirements for high-voltage levels can be met while satisfying the initial triggering requirements of the vacuum gap switch.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, and in particular relates to a vacuum gap switch control method, control mechanism and DC circuit breaker. Background Technology

[0002] DC circuit breakers are critical equipment for ensuring the safe and stable operation of power systems. They can quickly interrupt current when a power system fault occurs, preventing damage and playing a key role in improving power system reliability. With the increasing demand for high reliability and rapid response in power systems, vacuum switches are commonly used in DC circuit breakers to handle the current-carrying and arc-extinguishing functions of the main current-carrying branches. However, limited by finite contact spacing and short arcing time, vacuum switches cannot fully utilize their optimal insulation recovery performance, affecting the overall performance of the DC circuit breaker.

[0003] To improve the performance of DC circuit breakers, vacuum gap switches are added. During normal operation of the power system, the vacuum switch is responsible for current flow. When a fault occurs in the power system, the vacuum gap switch conducts, transferring current from one branch to another. After the arc is extinguished by the vacuum gap switch current crossing zero, the current is further transferred to the energy-consuming branch. Thanks to the longer opening distance of the vacuum gap switch, its post-arc recovery capability is significantly better than that of a traditional vacuum circuit breaker. However, vacuum gap switches in related technologies are all fixed-distance switches. When this fixed opening distance is small, it cannot meet the insulation recovery requirements of high-voltage levels. Summary of the Invention

[0004] This application provides a vacuum gap switch control method, operating mechanism, and DC circuit breaker, which can solve the problem of failing to meet the insulation restoration requirements of high voltage levels.

[0005] In a first aspect, embodiments of this application provide a vacuum gap switch control method, including: Receive the start / stop command sent by the main control system; In response to an opening command, the moving contact of the vacuum gap switch is controlled to move at a first speed in a first direction to increase the opening distance between the moving contact and the stationary contact of the vacuum gap switch; wherein, the first direction is the direction away from the stationary contact.

[0006] Secondly, embodiments of this application provide a control mechanism, including: The receiving module is used to receive the start / stop commands sent by the main control system; The control module is used to respond to an opening command by controlling the moving contact of the vacuum gap switch to move at a first speed in a first direction to increase the opening distance between the moving contact and the stationary contact of the vacuum gap switch; wherein the first direction is the direction away from the stationary contact.

[0007] Thirdly, embodiments of this application provide a DC circuit breaker, comprising: Vacuum gap switch and control mechanism provided in the embodiments of this application.

[0008] In this embodiment, the control mechanism receives an opening / closing command from the main control system; in response to the opening / closing command, it controls the moving contact of the vacuum gap switch to move at a first speed in a first direction to increase the gap between the moving contact and the stationary contact of the vacuum gap switch; wherein, the first direction is the direction away from the stationary contact. In this way, the gap between the moving and stationary contacts of the vacuum gap switch can be increased, satisfying both the initial triggering requirements and the insulation recovery requirements while meeting the initial triggering requirements of the vacuum gap switch. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic flowchart of the vacuum gap switch control method provided in the embodiments of this application; Figure 2 This is a schematic diagram illustrating the first variation of the opening distance provided in some embodiments of this application; Figure 3 This is a schematic diagram illustrating a second variation of the opening distance provided in some embodiments of this application; Figure 4 This is a schematic diagram of the control mechanism provided in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the DC circuit breaker provided in the embodiments of this application. Detailed Implementation

[0011] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0012] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0013] It should be noted that the acquisition, storage, use, and processing of data in this application embodiment all comply with the relevant provisions of national laws and regulations.

[0014] It should be noted that in the embodiments of this application, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, it does not mean that the applicant has used or necessarily used the solution.

[0015] The vacuum gap switch control method, operating mechanism, and DC circuit breaker provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0016] It should be noted that the vacuum gap switch control method provided in this application can be executed by a control mechanism. Some embodiments of this application use a control mechanism as the execution subject to illustrate the vacuum gap switch control method provided in this application. The vacuum gap switch in this application is a trigger vacuum switch (TVS).

[0017] Figure 1 This is a schematic flowchart of the vacuum gap switch control method provided in an embodiment of this application. Figure 1 As shown, the vacuum gap switch control method may include: Step 101: Receive the on / off command sent by the main control system; In some embodiments of this application, when the main control system detects a fault in the power system equipped with a DC circuit breaker, the main control system sends an opening command to the vacuum gap switch and the control mechanism. After receiving the opening command, the vacuum gap switch ignites through a trigger (e.g., a trigger pin) to quickly break through the gap of the vacuum gap switch, so that the vacuum gap switch is turned on and the current is transferred from the DC of the vacuum switch to the branch of the vacuum gap switch.

[0018] Step 102: In response to the opening command, control the moving contact of the vacuum gap switch to move in a first direction at a first speed to increase the opening distance between the moving contact and the stationary contact of the vacuum gap switch; wherein, the first direction is the direction away from the stationary contact.

[0019] In some embodiments of this application, the control mechanism can be connected to the moving contact of the vacuum gap switch. After receiving the opening command, the control mechanism controls the moving contact of the vacuum gap switch to move away from the stationary contact at a first speed, thereby increasing the gap between the moving contact and the stationary contact of the vacuum gap switch to meet the insulation restoration requirements.

[0020] In this embodiment, the control mechanism receives an opening / closing command from the main control system; in response to the opening / closing command, it controls the moving contact of the vacuum gap switch to move at a first speed in a first direction to increase the gap between the moving contact and the stationary contact of the vacuum gap switch; wherein, the first direction is the direction away from the stationary contact. In this way, the gap between the moving and stationary contacts of the vacuum gap switch can be increased, satisfying both the initial triggering requirements of the vacuum gap switch and the insulation recovery requirements for high voltage levels.

[0021] In some embodiments of this application, the first speed can be preset, for example, the preset first speed is 2.4 m / s.

[0022] In some embodiments of this application, before step 102, the vacuum gap switch control method provided in this application may further include: determining a first speed based on the initial opening distance of the vacuum gap switch, the voltage level of the DC circuit breaker including the vacuum gap switch, and the insulation recovery requirements.

[0023] In some embodiments of this application, the initial opening distance of the vacuum gap switch is the distance between the moving contact and the stationary contact of the vacuum gap switch when the vacuum gap switch is not conducting.

[0024] In some embodiments of this application, the DC circuit breaker in the embodiments of this application can be a DC circuit breaker.

[0025] For example, the initial opening distance of the vacuum gap switch is 8 mm, and its corresponding voltage level is 10 kV. The voltage level of the DC circuit breaker is 13 kV. The corresponding insulation recovery requirement is: the opening distance of the vacuum gap switch is 13 mm, and the insulation recovery requirement needs to be met 2 milliseconds after the vacuum gap switch is turned on.

[0026] The first velocity is: (13 mm - 8 mm) / 2 seconds = 2.5 mm / millisecond = 2.5 m / second.

[0027] For example, the initial opening distance of the vacuum gap switch is 8 mm, and its corresponding voltage level is 10 kV. The voltage level of the DC circuit breaker is 12 kV. The corresponding insulation recovery requirement is: the opening distance of the vacuum gap switch is 12 mm, and the insulation recovery requirement needs to be met 2 milliseconds after the vacuum gap switch is turned on.

[0028] The first velocity is: (12 mm - 8 mm) / 2 seconds = 2 mm / millisecond = 2 m / second.

[0029] It should be noted that the above correspondence between vacuum gap switches and voltage levels is only illustrative and can be determined according to actual circumstances.

[0030] In some embodiments of this application, the initial opening distance of the vacuum gap switch needs to ensure that the vacuum gap switch has an excellent static insulation withstand voltage level and maintains a low trigger energy requirement in a vacuum environment, thereby determining the safety of the vacuum gap switch in the non-conducting state and the sensitivity and reliability of the trigger response.

[0031] In some embodiments of this application, the initial opening distance can range from 3 mm to 8 mm.

[0032] In some embodiments of this application, the initial opening distance can be set according to actual needs.

[0033] In some embodiments of this application, the vacuum gap switch control method provided in this application may further include: controlling the moving contact of the vacuum gap switch to stop moving when the vacuum gap switch current crosses zero and the arc is extinguished.

[0034] For example, the initial opening distance of the vacuum gap switch is 8 mm. When the main control system detects a fault in the power system equipped with a DC circuit breaker, it sends an opening command to the vacuum gap switch and the operating mechanism. Upon receiving the opening command, the vacuum gap switch ignites its trigger element, rapidly breaking down the gap and turning on the vacuum gap switch, transferring the current from the vacuum switch's DC circuit to the vacuum gap switch's branch circuit. Upon receiving the opening command, the operating mechanism controls the moving contact of the vacuum gap switch to move away from the stationary contact at a speed of 2.4 m / s, increasing the opening distance between the moving and stationary contacts to meet insulation restoration requirements.

[0035] Assuming that the vacuum gap switch extinguishes the arc by crossing zero current 2 seconds after receiving the interruption command, the moving contact of the vacuum gap switch will stop moving. At this time, the gap between the moving and stationary contacts of the vacuum gap switch reaches 12.8 mm. During the post-arc recovery phase, the gap between the moving and stationary contacts of the vacuum gap switch remains 12.8 mm.

[0036] The change in the opening distance between the moving and stationary contacts of a vacuum gap switch is as follows: Figure 2 As shown, Figure 2 This is a schematic diagram illustrating the first variation of the opening distance provided in some embodiments of this application.

[0037] exist Figure 2 In this context, T1 is the time when the vacuum gap switch receives the interruption command, and T2 is the time when the vacuum gap switch current crosses zero and extinguishes the arc.

[0038] In some embodiments of this application, the vacuum gap switch control method provided in this application may further include: controlling the moving contact of the vacuum gap switch to stop moving when the gap between the moving contact and the stationary contact reaches a first gap; wherein the first gap is the distance corresponding to the insulation recovery requirement of the DC circuit breaker including the vacuum gap switch.

[0039] For example, the initial opening distance of the vacuum gap switch is 8 mm, and the first opening distance is 12 mm. When the main control system detects a fault in the power system equipped with a DC circuit breaker, the main control system sends an opening command to the vacuum gap switch and the operating mechanism. Upon receiving the opening command, the vacuum gap switch ignites its trigger element, rapidly breaking down the gap of the vacuum gap switch, causing the vacuum gap switch to conduct and transferring the current from the vacuum switch DC to the vacuum gap switch branch. Upon receiving the opening command, the operating mechanism controls the moving contact of the vacuum gap switch to move away from the stationary contact at a speed of 2.5 m / s, increasing the opening distance between the moving and stationary contacts of the vacuum gap switch to meet the insulation restoration requirements.

[0040] 1.6 seconds after the vacuum gap switch receives the interruption command, when the gap between the moving and stationary contacts reaches 12 mm, the moving contact of the vacuum gap switch stops moving. Assuming that the vacuum gap switch current crosses zero and extinguishes the arc 2 seconds after receiving the interruption command, the gap between the moving and stationary contacts remains at 12 mm. During the post-arc recovery phase, the gap between the moving and stationary contacts remains at 12 mm.

[0041] The change in the opening distance between the moving and stationary contacts of a vacuum gap switch is as follows: Figure 3 As shown, Figure 3 This is a schematic diagram illustrating a second variation of the opening distance provided in some embodiments of this application.

[0042] exist Figure 3 In the diagram, T1 is the time when the vacuum gap switch receives the interruption command, T2 is the time when the opening distance between the moving and stationary contacts of the vacuum gap switch reaches the first opening distance, and T3 is the time when the current of the vacuum gap switch crosses zero and extinguishes the arc.

[0043] This application also provides a control mechanism, such as... Figure 4 As shown. Figure 4 This is a schematic diagram of the structure of the control mechanism provided in the embodiment of this application. The control mechanism 400 may include: The receiving module 401 is used to receive the start / stop command sent by the main control system; The control module 402 is used to respond to the opening command and control the moving contact of the vacuum gap switch to move in a first direction at a first speed to increase the opening distance between the moving contact and the stationary contact of the vacuum gap switch; wherein, the first direction is the direction away from the stationary contact.

[0044] In this embodiment, the control mechanism receives an opening / closing command from the main control system; in response to the opening / closing command, it controls the moving contact of the vacuum gap switch to move at a first speed in a first direction to increase the gap between the moving contact and the stationary contact of the vacuum gap switch; wherein, the first direction is the direction away from the stationary contact. In this way, the gap between the moving and stationary contacts of the vacuum gap switch can be increased, satisfying both the initial triggering requirements of the vacuum gap switch and the insulation recovery requirements for high voltage levels.

[0045] In some embodiments of this application, the control mechanism 400 further includes: The determination module is used to determine the first speed based on the initial opening distance of the vacuum gap switch, the voltage level of the DC circuit breaker including the vacuum gap switch, and the insulation recovery requirements.

[0046] In some embodiments of this application, the control module 402 is further configured to: When the arc is extinguished due to the zero current of the vacuum gap switch, the moving contact of the vacuum gap switch is controlled to stop moving.

[0047] In some embodiments of this application, the control module 402 is further configured to: When the gap between the moving contact and the stationary contact reaches the first gap, the moving contact of the vacuum gap switch is controlled to stop moving; wherein, the first gap is the distance corresponding to the insulation recovery requirement of the DC circuit breaker including the vacuum gap switch.

[0048] This application also provides a DC circuit breaker, such as... Figure 5 As shown. Figure 5 This is a schematic diagram of the structure of a DC circuit breaker provided in an embodiment of this application. The DC circuit breaker 500 may include: Vacuum gap switch 501 and control mechanism 400.

[0049] In some embodiments of this application, the DC circuit breaker 500 also includes a vacuum switch; The control mechanism 400 is also used to: control the vacuum switch to open in response to an opening command.

[0050] In some embodiments of this application, when the main control system detects a fault in the power system equipped with a DC circuit breaker, the main control system sends an opening command to the vacuum gap switch and the control mechanism. Upon receiving the opening command, the vacuum gap switch ignites its trigger element, rapidly breaking down the gap of the vacuum gap switch and turning it on, transferring the current from the vacuum switch's DC circuit to the vacuum gap switch's branch circuit. Upon receiving the opening command, the control mechanism controls the vacuum switch to open and controls the moving contact of the vacuum gap switch to move away from the stationary contact at a first velocity, increasing the gap between the moving and stationary contacts of the vacuum gap switch to meet the insulation restoration requirements.

[0051] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0052] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable read-only memory (EROM), floppy disks, compact disc read-only memory (CD-ROM), optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0053] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0054] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0055] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A vacuum gap switch control method, characterized in that, The method includes: Receive the start / stop command sent by the main control system; In response to the interruption command, the moving contact of the vacuum gap switch is controlled to move at a first speed in a first direction to increase the gap between the moving contact and the stationary contact of the vacuum gap switch; wherein, the first direction is the direction away from the stationary contact.

2. The method according to claim 1, characterized in that, Before the moving contact of the control vacuum gap switch moves in a first direction at a first speed, the method further includes: The first speed is determined based on the initial opening distance of the vacuum gap switch, the voltage level of the DC circuit breaker including the vacuum gap switch, and the insulation recovery requirements.

3. The method according to claim 1, characterized in that, The method further includes: When the arc is extinguished due to the zero current of the vacuum gap switch, the moving contact of the vacuum gap switch is controlled to stop moving.

4. The method according to claim 1, characterized in that, The method further includes: When the gap between the moving contact and the stationary contact reaches a first gap, the moving contact of the vacuum gap switch is controlled to stop moving; wherein, the first gap is the distance corresponding to the insulation recovery requirement of the DC circuit breaker including the vacuum gap switch.

5. A control mechanism, characterized in that, The control mechanism includes: The receiving module is used to receive the start / stop commands sent by the main control system; A control module is configured to, in response to the opening command, control the moving contact of the vacuum gap switch to move at a first speed in a first direction to increase the opening distance between the moving contact and the stationary contact of the vacuum gap switch; wherein the first direction is the direction away from the stationary contact.

6. The control mechanism according to claim 5, characterized in that, The control mechanism also includes: The determining module is used to determine the first speed based on the initial opening distance of the vacuum gap switch, the voltage level of the DC circuit breaker including the vacuum gap switch, and the insulation recovery requirements.

7. The control mechanism according to claim 5, characterized in that, The control module is also used for: When the current of the vacuum gap switch crosses zero and the arc is extinguished, the moving contact of the vacuum gap switch is controlled to stop moving.

8. The control mechanism according to claim 5, characterized in that, The control module is also used for: When the gap between the moving contact and the stationary contact reaches a first gap, the moving contact of the vacuum gap switch is controlled to stop moving; wherein, the first gap is the distance corresponding to the insulation recovery requirement of the DC circuit breaker including the vacuum gap switch.

9. A DC circuit breaker, characterized in that, The DC circuit breaker includes: Vacuum gap switch and the control mechanism according to any one of claims 5 to 8.

10. The DC circuit breaker according to claim 9, characterized in that, The DC circuit breaker also includes a vacuum switch; The control mechanism is also used to: control the vacuum switch to open in response to the opening command.

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