Arc-free on-off method and device of vacuum mechanical switch, electronic equipment and storage medium

Abstract

The invention discloses an arc-free on-off method and device of a vacuum mechanical switch, electronic equipment and a storage medium, the method is suitable for a vacuum mechanical circuit breaker, the vacuum mechanical circuit breaker comprises two branches which are connected in parallel, and each branch comprises a diode and a vacuum mechanical switch; the diodes in the two branches are reversely connected in parallel; the arc-free breaking method comprises the following steps: when the vacuum mechanical circuit breaker has a short-circuit fault, determining current half-waves which can pass through a first diode and a second diode, and according to positive and negative half-waves of short-circuit current and the current half-waves which can pass through the first diode and the second diode, carrying out arc-free breaking on the vacuum mechanical circuit breaker; obtaining a first time period in which the passing current in the first diode is zero and a second time period in which the passing current in the second diode is zero; and the first vacuum mechanical switch is controlled to be switched off in the first time period, and the second vacuum mechanical switch is controlled to be switched off in the second time period. According to the invention, arc-free on-off of the vacuum mechanical switch can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of large-capacity breaking, and in particular to an arc-free breaking method, device, electronic equipment and storage medium of a vacuum mechanical switch. Background Art

[0002] With the rapid development of industry and economy, hydropower, nuclear power, and thermal power units with a single unit capacity of more than 1000MW are widely used throughout the country. The operating reliability of large-capacity generator circuit breakers plays a vital role in the safety of power plants. Therefore, the study of large-capacity circuit breakers is of great significance for the stable operation of power systems. At present, there are mainly two types of generator circuit breakers: SF6 circuit breakers and vacuum circuit breakers. SF6 circuit breakers use SF6 gas with a strong greenhouse effect, which causes environmental pollution and is restricted from large-scale use. At the same time, vacuum circuit breakers have gradually become a research hotspot with their advantages of being green and pollution-free, simple structure, low manufacturing cost, and strong arc extinguishing ability. Therefore, it is of great significance to study environmentally friendly and large-capacity vacuum circuit breakers that can break.

[0003] Mechanical circuit breakers are widely used for their advantages such as simple structure and fast action speed. However, the basic principle of mechanical circuit breakers is to drive the arc extinguishing chamber to move through the operating mechanism, generate an arc and wait for the current to cross zero. When the current flowing through the arc extinguishing chamber is zero, the arc is extinguished and the breaking is completed. Using this principle, mechanical circuit breakers can improve the breaking speed of mechanical circuit breakers by using fast switches and applying phase control technology. However, it is inevitable that no matter which method is used, the arc gap of the arc extinguishing chamber will be burned within a certain period of time. This is because it is necessary to generate an arc by driving the arc extinguishing chamber to move through the mechanism before the current crosses zero. This causes an arc to be generated in the arc extinguishing chamber every time the mechanical switch breaks the current. The large arc energy and high heat will cause ablation of the arc extinguishing chamber contacts, thereby causing the arc extinguishing chamber to age and fail. For some mechanical circuit breakers with large rated operating current, such as the generator outlet circuit breaker, the arc current generated during breaking is larger, and the energy and heat generated are greater. Often, breaking a short-circuit current will cause serious burning of the arc extinguishing chamber contacts, seriously affecting the stable operation of the mechanical circuit breaker and the life of the arc extinguishing chamber. Summary of the invention

[0004] The present invention provides an arc-free breaking method, device, electronic equipment and storage medium of a vacuum mechanical switch to solve the technical problem that the breaking current of the vacuum mechanical switch will generate an arc in the arc extinguishing chamber, and the large arc energy and high heat will cause ablation of the arc extinguishing chamber contacts, thereby causing aging and failure of the arc extinguishing chamber.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides an arc-free breaking method of a vacuum mechanical switch, which is applicable to a vacuum mechanical circuit breaker:

[0006] The vacuum mechanical circuit breaker comprises: a first branch and a second branch; the first branch and the second branch are connected in parallel;

[0007] The first branch includes: a first vacuum mechanical switch and a first diode, wherein the first vacuum mechanical switch and the first diode are connected in series;

[0008] The second branch includes: a second vacuum mechanical switch and a second diode, the second vacuum mechanical switch and the second diode are connected in series; the first diode and the second diode are connected in reverse parallel;

[0009] The arc-free breaking method comprises:

[0010] When a short-circuit fault occurs in the vacuum mechanical circuit breaker, determining the positive half-wave and the negative half-wave of the short-circuit current according to the short-circuit current of the vacuum mechanical circuit breaker;

[0011] According to the current flow direction of the short-circuit current, a half-wave of current that can pass through the first diode and a half-wave of current that can pass through the second diode are obtained; according to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of current that can pass through the first diode and the half-wave of current that can pass through the second diode, a first time period in which the current passing through the first diode is zero and a second time period in which the current passing through the second diode is zero are obtained by analysis;

[0012] The first vacuum mechanical switch is controlled to be opened in a first time period, and the second vacuum mechanical switch is controlled to be opened in a second time period.

[0013] As a preferred solution, whether the vacuum mechanical circuit breaker has a short circuit fault is determined in the following manner:

[0014] Acquire the current sampling value in the vacuum mechanical circuit breaker in real time, and calculate the corresponding F according to the current sampling value and the preset current estimation value 0 Hypothesis test value;

[0015] The F0 hypothesis test value is compared with a preset threshold value. When the F0 hypothesis test value is less than the preset threshold value, it is determined that a short circuit fault has occurred in the vacuum mechanical circuit breaker, and the corresponding current sampling value is used as the short-circuit current of the vacuum mechanical circuit breaker; otherwise, it is determined that no short circuit fault has occurred in the vacuum mechanical circuit breaker.

[0016] As a preferred solution, the F 0 The calculation formula for the hypothesis test value is:

[0017]

[0018] Among them, SSR is the regression sum of squares, SS E is the residual sum of squares, m is the number of unknown variables, n is the number of sample values ​​in the test, p is the number of columns in the coefficient matrix, is the estimated current value, is the sampling mean, y i is the current sampling value.

[0019] As a preferred solution, the vacuum mechanical circuit breaker further comprises: the third branch;

[0020] The third branch is connected in parallel with the first branch and the second branch respectively;

[0021] The third branch includes: a lightning arrester.

[0022] As a preferred solution, after controlling the first vacuum mechanical switch to be opened in the first time period and controlling the second vacuum mechanical switch to be opened in the second time period, the method further includes:

[0023] The arrester is controlled to operate so as to absorb the residual energy in the vacuum mechanical circuit breaker.

[0024] As a preferred solution, the analysis of obtaining a first time period in which the current passing through the first diode is zero and a second time period in which the current passing through the second diode is zero based on the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of the current that can pass through the first diode, and the half-wave of the current that can pass through the second diode includes:

[0025] According to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of the current that can pass through the first diode, and the half-wave of the current that can pass through the second diode, if the half-wave of the current that can pass through the first diode is a positive half-wave, the time period corresponding to the negative half-wave of the short-circuit current is used as the first time period when the current passing through the first diode is zero, and the time period corresponding to the positive half-wave of the short-circuit current is used as the second time period when the current passing through the second diode is zero; wherein the half-waves of the current that can pass through the first diode and the second diode are opposite;

[0026] If the current half-wave that can pass through the first diode is a negative half-wave, the time period corresponding to the positive half-wave of the short-circuit current is used as the first time period when the current passing through the first diode is zero, and the time period corresponding to the negative half-wave of the short-circuit current is used as the second time period when the current passing through the second diode is zero.

[0027] As a preferred solution, after controlling the arrester to act so that the arrester absorbs the residual energy in the vacuum mechanical circuit breaker, the method further includes:

[0028] The first vacuum machine and the second vacuum machine are controlled to switch and gate.

[0029] Based on the above embodiment, another embodiment of the present invention provides an arc-free breaking device for a vacuum mechanical switch, comprising: a short-circuit current analysis module, a diode current analysis module and a vacuum mechanical switch opening control module;

[0030] The short-circuit current analysis module is used to determine the positive half-wave and negative half-wave of the short-circuit current according to the short-circuit current of the vacuum mechanical circuit breaker when a short-circuit fault occurs in the vacuum mechanical circuit breaker;

[0031] The diode current analysis module is used to obtain a current half-wave that can pass through the first diode and a current half-wave that can pass through the second diode according to the current flow direction of the short-circuit current, and to analyze and obtain a first time period in which the current passing through the first diode is zero, and a second time period in which the current passing through the second diode is zero according to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the current half-wave that can pass through the first diode, and the current half-wave that can pass through the second diode;

[0032] The vacuum mechanical switch opening control module is used to control the first vacuum mechanical switch to be opened in a first time period, and to control the second vacuum mechanical switch to be opened in a second time period.

[0033] Based on the above embodiments, another embodiment of the present invention provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the arc-free breaking method of the vacuum mechanical switch described in the above invention embodiments is implemented.

[0034] Based on the above embodiments, another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the arc-free breaking method of the vacuum mechanical switch described in the above invention embodiment.

[0035] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0036] The present invention provides an arc-free breaking method of a vacuum mechanical switch, which is applicable to a vacuum mechanical circuit breaker, wherein the vacuum mechanical circuit breaker comprises: a first branch and a second branch; the first branch and the second branch are connected in parallel; the first branch comprises: a first vacuum mechanical switch and a first diode, the first vacuum mechanical switch and the first diode are connected in series; the second branch comprises: a second vacuum mechanical switch and a second diode, the second vacuum mechanical switch and the second diode are connected in series; the first diode and the second diode are connected in reverse parallel. Since the diode has only unidirectional conduction capability and the two diodes are connected in reverse parallel, the diode of one branch allows current to flow from left to right, and the diode of the other branch allows current to flow from right to left, that is, the two branches only flow current within a specific half-wave under the left and right sides of the diodes, so when a short circuit fault occurs in the vacuum mechanical circuit breaker, the current flowing through the two vacuum mechanical switches is zero for a period of time.

[0037] When a short circuit fault occurs in the vacuum mechanical circuit breaker, the positive half-wave and negative half-wave of the short circuit current are determined according to the short circuit current of the vacuum mechanical circuit breaker; the current half-wave that can pass through the first diode and the current half-wave that can pass through the second diode are obtained according to the current flow direction of the short circuit current; according to the positive half-wave of the short circuit current, the negative half-wave of the short circuit current, the current half-wave that can pass through the first diode and the current half-wave that can pass through the second diode, the first time period in which the current passing through the first diode is zero and the second time period in which the current passing through the second diode is zero are analyzed; the first vacuum mechanical switch is controlled to be opened in the first time period, and the second vacuum mechanical switch is controlled to be opened in the second time period. In the present invention, when the current passing through the two branches is zero, the vacuum mechanical switch of the corresponding branch is controlled to be opened. Since no current passes through the vacuum mechanical switch during the opening, no arc is generated, that is, the current is disconnected, so that the arc-free breaking of the vacuum mechanical switch is realized. Therefore, under ideal conditions, the contact of the vacuum mechanical switch will not be ablated, which can significantly improve the service life of the vacuum mechanical switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of an arc-free breaking method of a vacuum mechanical switch provided by one embodiment of the present invention;

[0039] Figure 2 This is the topological structure diagram corresponding to the large-capacity arc-free interruption of the vacuum mechanical switch in combination with the diode;

[0040] Figure 3 It is the breaking flow chart of vacuum mechanical switch;

[0041] Figure 4 It is the waveform diagram of the rated current of the breaking system;

[0042] Figure 5 It is the waveform diagram of the short-circuit current of the breaking system;

[0043] Figure 6 It is a structural schematic diagram of an arc-free breaking device of a vacuum mechanical switch provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] Embodiment 1

[0052] Please refer to Figure 1 , is a flow chart of an arc-free breaking method of a vacuum mechanical switch provided by an embodiment of the present invention, the method is applicable to a vacuum mechanical circuit breaker, the vacuum mechanical circuit breaker comprises: a first branch and a second branch; the first branch and the second branch are connected in parallel;

[0053] The first branch includes: a first vacuum mechanical switch and a first diode, wherein the first vacuum mechanical switch and the first diode are connected in series;

[0054] The second branch includes: a second vacuum mechanical switch and a second diode, the second vacuum mechanical switch and the second diode are connected in series; the first diode and the second diode are connected in reverse parallel.

[0055] Preferably, the vacuum mechanical circuit breaker further includes: the third branch; the third branch is connected in parallel with the first branch and the second branch respectively; the third branch includes: a lightning arrester.

[0056] For details, please refer to Figure 2 , which is the topological structure diagram corresponding to the large-capacity arc-free interruption of the vacuum mechanical switch in combination with the diode. Its topological structure consists of three parallel branches, two of which are composed of vacuum mechanical series diodes. The parameters of the vacuum mechanical switches and diodes in these two branches are the same. The diode in one branch allows the current to flow from left to right, and the diode in the other branch allows the current to flow from right to left. The third branch is composed of a lightning arrester, which will absorb the remaining energy after the vacuum mechanical switch successfully breaks the current to limit the system overvoltage.

[0057] The current flowing through the two branches is limited by two anti-parallel diodes. When the rated operating current passes, under the action of the anti-parallel diodes, the two parallel current-carrying branches will only pass the current of their respective half-waves; when the short-circuit current passes, under the action of the anti-parallel diodes, the two parallel branches will only pass the current in a single direction.

[0058] When disconnecting the rated operating current, the disconnection control device will send opening instructions to the vacuum mechanical switches of the two current branches respectively when the currents flowing through the two current branches are zero according to the collected current signals, so that the vacuum mechanical switches will be disconnected when the currents flowing through each of them are zero, thereby completing the arc-free disconnection of the rated operating current of the system.

[0059] Please refer to Figure 3 , is a flow chart of the breaking of a vacuum mechanical switch. The control part of the arc-free breaking method is composed of a signal acquisition system, a fault judgment device and a mechanical vacuum switch control device, including the following specific steps:

[0060] S1. When a short-circuit fault occurs in the vacuum mechanical circuit breaker, determining the positive half-wave and the negative half-wave of the short-circuit current according to the short-circuit current of the vacuum mechanical circuit breaker;

[0061] Preferably, whether a short circuit fault occurs in the vacuum mechanical circuit breaker is determined in the following manner: a current sampling value in the vacuum mechanical circuit breaker is acquired in real time, and a corresponding F0 hypothesis test value is calculated based on the current sampling value and a preset current estimation value; the F0 hypothesis test value is compared with a preset threshold value, and when the F0 hypothesis test value is less than the preset threshold value, it is determined that a short circuit fault occurs in the vacuum mechanical circuit breaker, and the corresponding current sampling value is used as the short-circuit current of the vacuum mechanical circuit breaker; otherwise, it is determined that no short circuit fault occurs in the vacuum mechanical circuit breaker.

[0062] Preferably, the calculation formula of the F0 hypothesis test value is:

[0063]

[0064]

[0065] Among them, SS R is the regression sum of squares, SS E is the residual sum of squares, m is the number of unknown variables, n is the number of sample values ​​in the test, p is the number of columns in the coefficient matrix, is the estimated current value, is the sampling mean, y i is the current sampling value.

[0066] Please refer to Figure 4, which is the waveform diagram of the rated current of the breaking system. When the power system is running stably, since the diode has only unidirectional conduction capability, the current will flow through different paths in different positive and negative half-waves. The signal acquisition system continuously collects current signals and transmits them to the fault judgment device. At this time, no fault occurs in the system, so the fault judgment device will not transmit the signal to the switch control device, and both vacuum mechanical switches remain closed.

[0067] Please refer to Figure 5 , is the waveform of the short-circuit current of the disconnected system. When a short-circuit fault occurs in the system, the signal acquisition system collects the fault current and transmits the fault current to the fault judgment device. At this time, the fault judgment device uses the "F0 hypothesis test" algorithm to calculate and judge whether a short-circuit fault occurs in the system. The formula of the "F0 hypothesis test" or "significance test of the regression equation" is as follows:

[0068]

[0069] Among them, SS R is the regression sum of squares, SS E is the residual sum of squares, m is the number of unknown variables, n is the number of sample values ​​in the test, p is the number of columns in the coefficient matrix, Estimate the current value for the model, is the sampling mean, y i is the current sampling value.

[0070] When there is no short-circuit fault in the system, the current sampling data is equal to the current estimated value data, and F0 is infinite at this time; when a fault occurs, the current sampling data will not be equal to the current estimated value data, and F0 will be a relatively small number. The value of F0 under short-circuit fault and overload conditions is very different. By setting the threshold of F0, it is possible to determine whether a short-circuit fault has occurred by judging the calculated F0 and the threshold, and then determine whether a short-circuit fault signal is issued. If a short-circuit fault occurs, the fault judgment device transmits the fault signal and the current signal collected by the signal acquisition system to the disconnection control device. After receiving the fault signal transmitted by the fault judgment device and the current signal collected by the signal acquisition system, the disconnection control device controls the opening and closing of the two mechanical vacuum switches in real time according to the current signal.

[0071] In a specific embodiment, the generator is set on the left side of the circuit breaker. At this time, the first diode in the first branch only allows current to flow from left to right, that is, to flow through the positive half-wave of current, and the second diode in the second branch allows current to flow from right to left, that is, to flow through the negative half-wave of current.

[0072] When interrupting the short-circuit fault current, the interrupter control device will determine the positive and negative of the short-circuit current signal based on the collected short-circuit current signal through the judgment statement written in advance, and then determine the positive and negative half-waves of the short-circuit current.

[0073] S2, obtaining a half-wave of current that can pass through the first diode and a half-wave of current that can pass through the second diode according to the current flow direction of the short-circuit current, and analyzing and obtaining a first time period in which the current passing through the first diode is zero and a second time period in which the current passing through the second diode is zero according to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of current that can pass through the first diode and the half-wave of current that can pass through the second diode;

[0074] Preferably, the analysis to obtain the first time period during which the current passing through the first diode is zero and the second time period during which the current passing through the second diode is zero according to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of the current that can pass through the first diode and the half-wave of the current that can pass through the second diode includes: according to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of the current that can pass through the first diode and the half-wave of the current that can pass through the second diode, if the half-wave of the current that can pass through the first diode is a positive half-wave, then the time period corresponding to the negative half-wave of the short-circuit current is used as the first time period during which the current passing through the first diode is zero, and the time period corresponding to the positive half-wave of the short-circuit current is used as the second time period during which the current passing through the second diode is zero; wherein the half-waves of the current that can pass through the first diode and the second diode are opposite; if the half-wave of the current that can pass through the first diode is a negative half-wave, then the time period corresponding to the positive half-wave of the short-circuit current is used as the first time period during which the current passing through the first diode is zero, and the time period corresponding to the negative half-wave of the short-circuit current is used as the second time period during which the current passing through the second diode is zero.

[0075] Specifically, since the two branches only flow current within a specific half-wave on the left and right sides of the diode, after the short-circuit current occurs, the current flowing through the two vacuum mechanical switches is zero for a period of time, that is, the current only flows through the other branch at this time. In a specific embodiment, the generator is set on the left side of the circuit breaker. At this time, the first diode in the first branch only allows the current to flow from left to right, that is, to flow through the positive half-wave of the current, and the second diode in the second branch allows the current to flow from right to left, that is, to flow through the negative half-wave of the current. After determining the positive and negative half-waves of the current, the vacuum mechanical switch of the first branch is controlled to operate during the positive half-wave of the current, and the vacuum mechanical switch of the second branch is controlled to operate during the negative half-wave of the current, thereby completing arc-free breaking when both branches are not flowing.

[0076] S3. Control the first vacuum mechanical switch to be opened in a first time period, and control the second vacuum mechanical switch to be opened in a second time period.

[0077] Preferably, after controlling the first vacuum mechanical switch to open within the first time period and controlling the second vacuum mechanical switch to open within the second time period, it also includes: controlling the arrester to operate so that the arrester absorbs residual energy in the vacuum mechanical circuit breaker.

[0078] Preferably, after controlling the arrester to operate so that the arrester absorbs the residual energy in the vacuum mechanical circuit breaker, the method further includes: controlling the first vacuum mechanical switch and the second vacuum mechanical switch to perform AND operation.

[0079] Specifically, when the disconnect control device receives a fault signal, the control device sends a trip signal to the vacuum switch during a time period when the current flowing through each of the two vacuum switches is zero, until both vacuum switches are successfully disconnected.

[0080] After both vacuum switches have successfully completed the opening, the arrester of the energy-consuming branch absorbs the remaining energy in the system and limits the overvoltage protection diodes and other devices in the system. In addition, after the short-circuit current is interrupted and the system overvoltage is limited, if the system needs to perform a reclosing operation, a closing command is sent to the interruption control device through the command port, and the mechanical vacuum switch performs reclosing. If the system fault has been removed at this time, the reclosing is completed. If the system fault has not been removed at this time, the system will continue to have a short-circuit current after reclosing. At this time, the signal acquisition system collects the fault current and transmits it to the fault judgment device, and the fault current is interrupted according to the one-time breaking process.

[0081] It can be seen that the present invention provides an arc-free breaking method for a vacuum mechanical switch. Through the above working process, the short-circuit fault current and the rated breaking current in the system can be cut off, and large-capacity short-circuit breaking and rated breaking can be achieved. And when the fault current comes in the reverse direction, it also has the breaking function; at the same time, the vacuum interrupter of the present breaking method is an arc-free breaking current, with a fast recovery speed, which can meet the requirements of fast reclosing, has a reclosing function, and the interrupter will not be burned by arc during the breaking process, which greatly extends the service life of the vacuum interrupter.

[0082] Embodiment 2

[0083] Please refer to Figure 6 , is a structural schematic diagram of an arc-free breaking device of a vacuum mechanical switch provided by an embodiment of the present invention, the device comprising: a short-circuit current analysis module, a diode current analysis module and a vacuum mechanical switch opening control module;

[0084] The short-circuit current analysis module is used to determine the positive half-wave and negative half-wave of the short-circuit current according to the short-circuit current of the vacuum mechanical circuit breaker when a short-circuit fault occurs in the vacuum mechanical circuit breaker;

[0085] The diode current analysis module is used to obtain a current half-wave that can pass through the first diode and a current half-wave that can pass through the second diode according to the current flow direction of the short-circuit current, and to analyze and obtain a first time period in which the current passing through the first diode is zero, and a second time period in which the current passing through the second diode is zero according to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the current half-wave that can pass through the first diode, and the current half-wave that can pass through the second diode;

[0086] The vacuum mechanical switch opening control module is used to control the first vacuum mechanical switch to be opened in a first time period, and to control the second vacuum mechanical switch to be opened in a second time period.

[0087] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0088] Those skilled in the art can clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0089] Embodiment 3

[0090] Accordingly, an embodiment of the present invention provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the arc-free breaking method of the vacuum mechanical switch described in the above-mentioned embodiment of the invention is implemented.

[0091] The electronic device may be a computing device such as a desktop computer, a notebook, a palm computer, a cloud server, etc. The device may include, but is not limited to, a processor and a memory.

[0092] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the device, and various interfaces and lines are used to connect various parts of the entire device.

[0093] Embodiment 4

[0094] Accordingly, an embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the arc-free breaking method of the vacuum mechanical switch described in the above-mentioned embodiment of the invention.

[0095] The memory can be used to store the computer program, and the processor realizes various functions of the device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0096] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, the steps of each method embodiment described above can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0097] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An arc-free breaking method for a vacuum mechanical switch, applicable to a vacuum mechanical circuit breaker, characterized in that: The vacuum mechanical circuit breaker comprises: a first branch and a second branch; the first branch and the second branch are connected in parallel; The first branch includes: a first vacuum mechanical switch and a first diode, wherein the first vacuum mechanical switch and the first diode are connected in series; The second branch includes: a second vacuum mechanical switch and a second diode, the second vacuum mechanical switch and the second diode are connected in series; the first diode and the second diode are connected in reverse parallel; The arc-free breaking method comprises: When a short-circuit fault occurs in the vacuum mechanical circuit breaker, determining the positive half-wave and the negative half-wave of the short-circuit current according to the short-circuit current of the vacuum mechanical circuit breaker; According to the current flow direction of the short-circuit current, a half-wave of current that can pass through the first diode and a half-wave of current that can pass through the second diode are obtained; according to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of current that can pass through the first diode and the half-wave of current that can pass through the second diode, a first time period in which the current passing through the first diode is zero and a second time period in which the current passing through the second diode is zero are obtained by analysis; The first vacuum mechanical switch is controlled to be opened in a first time period, and the second vacuum mechanical switch is controlled to be opened in a second time period.

2. The arc-free breaking method of a vacuum mechanical switch according to claim 1, characterized in that: Determine whether the vacuum mechanical circuit breaker has a short circuit fault by the following method: Acquire a current sampling value in the vacuum mechanical circuit breaker in real time, and calculate a corresponding F0 hypothesis test value according to the current sampling value and a preset current estimation value; The F0 hypothesis test value is compared with a preset threshold value. When the F0 hypothesis test value is less than the preset threshold value, it is determined that a short circuit fault has occurred in the vacuum mechanical circuit breaker, and the corresponding current sampling value is used as the short-circuit current of the vacuum mechanical circuit breaker; otherwise, it is determined that no short circuit fault has occurred in the vacuum mechanical circuit breaker.

3. The arc-free breaking method of a vacuum mechanical switch according to claim 2, characterized in that: The calculation formula of the F0 hypothesis test value is: Among them, SS R is the regression sum of squares, SS E is the residual sum of squares, m is the number of unknown variables, n is the number of sample values ​​in the test, p is the number of columns in the coefficient matrix, is the estimated current value, is the sampling mean, y i is the current sampling value.

4. The arc-free breaking method of a vacuum mechanical switch according to claim 1, characterized in that: The vacuum mechanical circuit breaker further comprises: the third branch; The third branch is connected in parallel with the first branch and the second branch respectively; The third branch includes: a lightning arrester.

5. The arc-free breaking method of a vacuum mechanical switch according to claim 4, characterized in that: After controlling the first vacuum mechanical switch to be opened in the first time period and controlling the second vacuum mechanical switch to be opened in the second time period, the method further includes: The arrester is controlled to operate so as to absorb the residual energy in the vacuum mechanical circuit breaker.

6. The arc-free breaking method of a vacuum mechanical switch according to claim 5, characterized in that: The step of analyzing the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of the current that can pass through the first diode, and the half-wave of the current that can pass through the second diode to obtain a first time period in which the current passing through the first diode is zero, and a second time period in which the current passing through the second diode is zero, comprises: According to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the half-wave of the current that can pass through the first diode, and the half-wave of the current that can pass through the second diode, if the half-wave of the current that can pass through the first diode is a positive half-wave, the time period corresponding to the negative half-wave of the short-circuit current is used as the first time period when the current passing through the first diode is zero, and the time period corresponding to the positive half-wave of the short-circuit current is used as the second time period when the current passing through the second diode is zero; wherein the half-waves of the current that can pass through the first diode and the second diode are opposite; If the current half-wave that can pass through the first diode is a negative half-wave, the time period corresponding to the positive half-wave of the short-circuit current is used as the first time period when the current passing through the first diode is zero, and the time period corresponding to the negative half-wave of the short-circuit current is used as the second time period when the current passing through the second diode is zero.

7. The arc-free breaking method of a vacuum mechanical switch according to claim 6, characterized in that: After controlling the arrester to act so that the arrester absorbs the residual energy in the vacuum mechanical circuit breaker, the method further includes: The first vacuum machine and the second vacuum machine are controlled to switch and gate.

8. An arc-free breaking device for a vacuum mechanical switch, characterized in that: include: Short-circuit current analysis module, diode current analysis module and vacuum mechanical switch opening control module; The short-circuit current analysis module is used to determine the positive half-wave and negative half-wave of the short-circuit current according to the short-circuit current of the vacuum mechanical circuit breaker when a short-circuit fault occurs in the vacuum mechanical circuit breaker; The diode current analysis module is used to obtain a current half-wave that can pass through the first diode and a current half-wave that can pass through the second diode according to the current flow direction of the short-circuit current, and to analyze and obtain a first time period in which the current passing through the first diode is zero, and a second time period in which the current passing through the second diode is zero according to the positive half-wave of the short-circuit current, the negative half-wave of the short-circuit current, the current half-wave that can pass through the first diode, and the current half-wave that can pass through the second diode; The vacuum mechanical switch opening control module is used to control the first vacuum mechanical switch to be opened in a first time period, and to control the second vacuum mechanical switch to be opened in a second time period.

9. An electronic device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the arc-free breaking method of the vacuum mechanical switch according to any one of claims 1 to 7 when executing the computer program.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute the arc-free breaking method of the vacuum mechanical switch according to any one of claims 1 to 7.

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