Bus protection device and bus protection method based on two-out-of-three

Abstract

The invention provides a bus protection device and method based on two-out-of-three. The bus protection device comprises an alternating current board, an input board, an output board, a management board and three independent protection CPU boards. Each independent protection CPU board completes sampling, AD conversion, CPU calculation and logic discrimination and then control relay outlets, and each branch outlet is formed by combining any two CPU outlet nodes in three outlet nodes independent of CPU control; the alternating current board collects alternating current electrical quantity of each branch in a protection area of the bus; the input board collects the input state of each branch of the protection area; each independent protection CPU board calculates a logic judgment result based on the input state and the alternating current electrical quantity so as to control the conduction of the corresponding outlet node; the bus protection device is divided into three completely independent protection control systems from sampling to CPU calculation and logic judgment and then to control on and off of outlet nodes, and under the condition that a certain component is abnormal, the bus protection device does not operate by mistake and does not refuse to operate, so that the reliability of bus protection is improved.

Description

Technical Field

[0001] The present application belongs to the field of power electronics technology, and in particular relates to a busbar protection device and a busbar protection method based on 2 out of 3. Background Art

[0002] The busbar is an indispensable device in the substation and one of the most critical devices for the stable operation of the power grid. As a device for collecting and distributing power in the process of power transmission and transformation, it is associated with the most primary devices, has the largest impact range in the event of a failure, and produces the most serious consequences. Therefore, when a busbar failure occurs in the system, how to ensure that the busbar protection device can accurately and reliably locate the fault on the busbar, isolate the fault point, and take effective treatment measures to quickly restore power supply is an important guarantee for the stable operation of the power system.

[0003] At present, most busbar protection devices have adopted microcomputer protection equipment, which is mainly composed of sampling and conversion links, CPU computer processing links, and control output links. Since the above links are mainly composed of AD chips, CPUs, relays and other devices, for the original protection device, when any link or device is abnormal, the device protection function will be lost. In severe cases, it may directly lead to refusal to operate or malfunction after a fault, which has a huge impact on the stability of power system operation. Therefore, how to improve the reliability of busbar protection is a technical problem to be solved. Summary of the invention

[0004] The purpose of this application is to provide a busbar protection device and a busbar protection method based on 2 out of 3, aiming to solve the technical problem mentioned in the above background technology that how to improve the reliability of busbar protection is an unresolved technical problem.

[0005] The first aspect of the embodiment of the present application provides a busbar protection device based on 2 out of 3, comprising: an AC board, an input board, an output board, a management board and 3 protection CPU boards; each of the protection CPU boards completes sampling to AD conversion, CPU calculation and logic judgment, and then to control relay output, wherein each branch output is composed of any two CPU output nodes in 3 output nodes independent of CPU control;

[0006] The AC board is configured to collect the AC electrical quantity of the protection area of ​​the busbar and transmit the AC electrical quantity to each of the protection CPU boards;

[0007] The digital input board is configured to collect the digital input state of the protection area and transmit the digital input state to each of the protection CPU boards respectively;

[0008] Each of the protection CPU boards is configured to calculate a logic judgment result based on the binary input state and the AC electrical quantity, and control the conduction of the corresponding output node according to the logic judgment result.

[0009] In one embodiment, the AC board is further used to isolate the AC electrical quantity through an auxiliary converter, and transmit the isolated AC electrical quantity to each of the protection CPU boards.

[0010] The digital input board is also used to perform strong and weak electrical isolation on the digital input state, and transmit the digital input state after strong and weak electrical isolation to each of the protection CPU boards respectively.

[0011] In one embodiment, each of the protection CPU boards can realize an AD conversion function and is configured to convert the AC electrical quantity and the binary input quantity status from analog quantities into digital quantities, and provide the digital quantity of the binary input quantity status and the digital quantity of the AC electrical quantity to the protection CPU board, so that the protection CPU board calculates a logical judgment result based on the digital quantity of the binary input quantity status and the digital quantity of the AC electrical quantity.

[0012] In one embodiment, the AC electrical quantity includes at least the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current of each branch connected to the bus.

[0013] In one embodiment, the binary input state at least includes a failure binary input signal of each branch.

[0014] In one embodiment, the busbar protection device further includes a display module;

[0015] The display module is used to display the logic judgment results calculated by each protection CPU board.

[0016] In one embodiment, the exit node is a relay exit node on an output plug-in;

[0017] Each of the protection CPU boards is configured to control the relay output node on the output plug-in to close according to the logic judgment result, so that the output node corresponding to the protection CPU board is turned on.

[0018] A second aspect of the embodiment of the present application provides a busbar protection method, which is applied to the busbar protection device as described in the first aspect, wherein the busbar protection device includes an AC board, an input board, an output board, a management board, and three protection CPU boards; each of the protection CPU boards completes sampling to AD conversion, CPU calculation and logic judgment, and then to control relay output, wherein each branch output is composed of any two CPU output nodes in three output nodes independent of CPU control, and the method includes:

[0019] The AC board collects the AC electrical quantity of the protection area of ​​the busbar, and transmits the AC electrical quantity to each of the protection CPU boards respectively;

[0020] The digital input board collects the digital input state of the protection area, and transmits the digital input state to each protection CPU board respectively;

[0021] Each protection CPU board calculates a logic judgment result based on the binary input state and the AC electrical quantity, and controls the conduction of the corresponding output node according to the logic judgment result.

[0022] In one embodiment, the AC board collects the AC electrical quantity of the bus and transmits the AC electrical quantity to each of the protection CPU boards respectively, including:

[0023] The AC board collects the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current of each branch connected to the busbar, and transmits the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current to each of the protection CPU boards respectively;

[0024] The step of collecting the binary input state of the protection area by the binary input board and transmitting the binary input state to each protection CPU board respectively includes:

[0025] The branch failure input signal of the protection area is collected by the input board, and the branch failure input signal is transmitted to each protection CPU board respectively.

[0026] In one embodiment, the method further comprises:

[0027] Among the three export nodes controlled by the protection CPU board, any combination of two CPU export nodes maintains the protection function of the protection area of ​​the bus when the corresponding branch outlet is turned on.

[0028] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: the busbar protection device based on 2 out of 3 provided by the present application includes an AC board, an input board, an output board, a management board and three independent protection CPU boards; each independent protection CPU board completes sampling to AD conversion, CPU calculation and logic judgment, and then to control relay output, and each branch output is composed of any two CPU output nodes in three output nodes independent of CPU control; the AC board collects the AC electrical quantity of the protection area of ​​the busbar; the input board collects the input quantity status of the protection area; each independent protection CPU board controls the conduction of the corresponding output node based on the input quantity status and the AC electrical quantity calculation logic judgment result; the busbar protection device of the present application is divided into three completely independent protection control systems from sampling to CPU calculation and logic judgment, and then to control the conduction of the output node, which can achieve that when a certain component is abnormal, the busbar protection device will not malfunction or refuse to operate, thereby effectively improving the reliability of the busbar protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a busbar protection device based on 2 out of 3 provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of a branch outlet circuit of a busbar protection device based on 2 out of 3 provided in an embodiment of the present invention;

[0031] Figure 3 A schematic flow chart of a busbar protection method based on 2 out of 3 provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] Embodiment 1

[0037] Figure 1 Schematic diagram of the structure of a busbar protection device based on 2 out of 3 in an embodiment of the present application. Figure 1 A busbar protection device provided by a preferred embodiment of the present application is shown, including: an AC board 10, an input board 20, and three protection CPU boards (that is, three sets of identical and independent hardware systems are selected), and these three sets of identical and independent hardware systems include a first protection CPU board 31, a second protection CPU board 32, and a third protection CPU board 33; each protection CPU board completes sampling to AD conversion, to CPU calculation and logic judgment, and then to the control relay outlet, and each outlet branch is composed of any two CPU outlet nodes of the three outlet nodes independent of CPU control. In addition, in a specific implementation, the busbar protection device of the embodiment of the present application also includes a management board 50, an outlet board, and a signal board (the outlet board and the signal board are not in Figure 2 ), power board and other plug-ins and bus backplane (including display module 61 and human-computer interaction module 62);

[0038] The AC board 10 is configured to collect AC electrical quantities in the protection area of ​​the busbar and transmit the AC electrical quantities to each protection CPU board respectively; specifically, the AC board 10 isolates the AC electrical quantities through an auxiliary converter, and converts the isolated AC electrical quantities into voltage signals and transmits them to each protection CPU board, and each independent protection CPU board can realize A / D conversion function (analog / digital conversion), and can convert analog signals into digital signals for processing and analysis; the AC electrical quantities of the embodiment of the present application may include the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current of each branch connected to the busbar.

[0039] The input board 20 is configured to collect the input state of the protection area and transmit the input state to each independent protection CPU board; in a specific implementation, the input board 20 can perform strong and weak electrical isolation on the input state, and transmit the input state after strong and weak electrical isolation to each protection CPU board. The input state of the embodiment of the present application at least includes the failure input signal of each branch.

[0040] Each independent protection CPU board is configured to calculate the logic judgment result based on the binary input state and the AC electrical quantity, and control the conduction of the corresponding output node according to the logic judgment result. That is, each protection CPU board is responsible for completing the analog sampling value AD conversion, calculation and protection logic judgment functions.

[0041] It should be noted that the CPUs of the three independent protection CPU boards of the busbar protection device in the embodiment of the present application all use completely consistent programs and sampling processes to perform a series of calculations and logical judgments on the digital quantity information collected by each of them;

[0042] In the embodiment of the present application, the output node is a relay output node (corresponding to) on the output plug-in corresponding to each independent protection CPU board. Figure 2 In the example of "exit node 1", "exit node 2", "exit node 3"), each independent protection CPU board (the first protection CPU board 31, the second protection CPU board 32 and the third protection CPU board 33) will control the closure of the relay outlet node on the corresponding output plug-in according to the logical judgment results calculated by each of them, so that the output node corresponding to the protection CPU board is turned on. The busbar protection device of the embodiment of the present application is equipped with multiple output plug-ins, each of which is completely independent, and each protection CPU controls the relay outlet node on the output plug-in corresponding to the CPU according to its own logical judgment results.

[0043] It can be understood that, among the three independent CPU-controlled export nodes of each branch of the bus protection device in the embodiment of the present application, any two CPU export nodes are combined, that is, the device is divided into three completely independent protection sampling calculation and logic export circuits from sampling to AD conversion, to CPU calculation and logic judgment, and then to control relay export. Under normal circumstances, the protection function will not be lost for any two of the three circuits.

[0044] refer to Figure 2 and Figure 3The exit node of each branch of the busbar protection device of the embodiment of the present application is composed of any two CPU exit nodes (exit node 1, exit node 2, exit node 3) controlled by three independent CPUs. Taking the exit of branch 1 as an example, the exit 1 corresponding to the first protection CPU board 31 includes at least two groups of exit nodes of branch 1, which are respectively recorded as: TR1_1 and TR1_2; the exit 2 corresponding to the second protection CPU board 32 also includes at least two groups of exit nodes of branch 1, which are respectively recorded as:

[0045] The outlet 3 corresponding to the third protection CPU board 33 also includes at least two groups of outlet nodes of branch 1, which are respectively recorded as: TR3_1 and TR3_2.

[0046] At this time, the exit circuit design of branch 1 is as follows

[0047] 1) First, connect any two CPU exit nodes in series:

[0048] TR1_1&&TR2_1, represents the serial connection of CPU1 and CPU2 exit nodes;

[0049] TR1_2&&TR3_1, represents the serial connection of CPU1 and CPU3 exit nodes;

[0050] TR2_2&&TR3_2, represents the serial connection of CPU2 and CPU3 exit nodes;

[0051] 2) Then connect the above serially connected outlets in parallel:

[0052] (TR1_1&&TR2_1)||(TR1_2&&TR3_1)||(TR2_2&&TR3_2), at this time, any one of the three groups of outlets can be turned on, the branch 1 outlet loop is turned on, and then the 3-out-of-2 function is realized. The branch n outlet loop is shown as follows Figure 3 shown.

[0053] The busbar protection device of the embodiment of the present application is divided into three completely independent protection control systems from sampling to AD conversion, to CPU calculation and logic judgment, and then to control relay output. Finally, the 3-out-of-2 method is adopted to achieve that when any AD chip, any CPU or any relay is abnormal, the busbar protection device will not malfunction or refuse to operate, which effectively improves the reliability of busbar protection. When two of the three independently corresponding output branches of the protection CPU board are turned on, the protection function of the protection area of ​​the busbar is maintained.

[0054] In addition, in a specific implementation, each protection CPU board can be configured with a power board, which is responsible for providing working power, such as Figure 2As shown, the first protection CPU board 31 corresponds to the power board 1 , the second protection CPU board 32 corresponds to the power board 2 , and the third protection CPU board 33 corresponds to the power board 3 .

[0055] In addition, the output board of the busbar protection device of the embodiment of the present application is responsible for completing the protection output function with isolation, and each output board is independently controlled by a single CPU, such as Figure 2 As shown, one end of the outlet branch is connected to the protection CPU board, and the outlet board can be set at Figure 2 The other end of the exit branch.

[0056] In addition, the management board 50 of the busbar protection device in the embodiment of the present application is responsible for completing the display, communication and human-machine interface functions. The management board 50 is connected to the display module 61, and the display module 61 is also powered by a power board. The display module 61 displays the logical judgment results calculated by each of the protection CPU boards.

[0057] Compared with the prior art, the busbar protection device of the embodiment of the present application is divided into three completely independent protection control systems from sampling to AD conversion, to CPU calculation and logic judgment, and then to control relay output. Finally, the 3-out-of-2 method is adopted to ensure that when any AD chip, any CPU or any relay has an abnormality alone, the busbar protection device will not malfunction or refuse to operate, thereby effectively improving the reliability of the busbar protection.

[0058] Embodiment 2

[0059] On the basis of the above-mentioned embodiment 1, embodiment 2 proposes a busbar protection method based on 2 out of 3. The busbar protection method of the embodiment of the present application is applied to the busbar protection device of embodiment 1, and the method includes:

[0060] Step S10: The AC board collects the AC electrical quantities in the protection area of ​​the busbar, and transmits the AC electrical quantities to each of the protection CPU boards respectively; specifically, the AC board collects the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current of each branch connected to the busbar, and transmits the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current to each of the protection CPU boards respectively.

[0061] Step S20: The digital input board collects the digital input status of the protection area, and transmits the digital input status to each of the protection CPU boards respectively; specifically, the digital input board collects the branch failure digital input signal of the protection area, and transmits the branch failure digital input signal to each of the protection CPU boards respectively.

[0062] In the specific implementation, the busbar protection device collects the instantaneous values ​​of the A, B, and C three-phase currents of all branches connected to the busbar at a constant sampling frequency as AC electrical quantities, and collects branch protection failures in the protection area at a constant sampling frequency as input quantity states; in the specific implementation, the voltage or current can be collected at a sampling frequency of 0.417ms or 0.833;

[0063] The instantaneous current value collected by the busbar protection device is converted by the device's small mutual inductor and then divided into three completely identical analog data paths, which are transmitted to three different CPUs through the bus board. The external failure input of the device is split into three paths through the bus board and transmitted to three different CPUs respectively.

[0064] The busbar protection device is equipped with three independent protection CPU boards, which are powered by independent power modules. The AD conversion chip on each CPU board is responsible for converting the analog data collected by this plug-in into digital data and then providing it to the CPU;

[0065] Step S30: Each of the protection CPU boards calculates a logic judgment result based on the binary input state and the AC electrical quantity, and controls the conduction of the corresponding outlet node according to the logic judgment result.

[0066] In a specific implementation, the three independent protection CPU boards of the embodiment of the present application all use completely consistent programs and sampling processes to perform a series of calculations and logical judgments on the digital quantity information collected by each of them;

[0067] Each protection CPU board of the busbar protection device of the embodiment of the present application independently performs a series of processing such as calculation and logical judgment on the analog quantity and input quantity data collected by the CPU. The three CPUs have completely consistent software and hardware and can be replaced with each other. The three CPUs perform the above processing synchronously, and the CPUs are independent of each other and do not interfere with each other.

[0068] Each protection CPU board outputs logical judgment results based on its own data, and sends the calculation results and action records to the management CPU for display. At the same time, each independent protection CPU board controls the corresponding output node according to its own judgment results, such as the first protection CPU board 31 controls the output node 1, the second protection CPU board 32 controls the output node 2, and the third protection CPU board 33 controls the output node 3. Each output is completely independent, and there is only one protection CPU to control it.

[0069] The busbar protection device of the embodiment of the present application is equipped with multiple output plug-ins, each of which is completely independent, and each protection CPU board controls the relay output node on the output plug-in corresponding to the CPU according to its own logic judgment result. Among the output nodes of each branch of the busbar protection device of the embodiment of the present application controlled by three independent CPUs, any two CPU output nodes are combined, that is, the device is divided into three completely independent protection sampling calculation and logic output circuits from sampling to AD conversion, to CPU calculation and logic judgment, and then to control relay output. Under normal circumstances, the protection function will not be lost for any two of the three circuits.

[0070] The busbar protection method of the embodiment of the present application splits the sampling and conversion link, the CPU computer processing link, and the control output link into three completely independent modules, each of which is powered by an independent power supply and processed by an independent CPU. When any link or device is abnormal, the protection function of the busbar protection device of the embodiment of the present application will not be lost. The embodiment of the present application effectively reduces the impact of the abnormality of a single component, a single CPU, or a single relay on the function of the protection device, and can effectively avoid the situation where the protection device refuses to operate or malfunctions due to the above abnormalities, greatly improving the reliability of the microcomputer protection device and strengthening the operation stability of the power system. The busbar protection method of the embodiment of the present application does not require changes to the original AC sampling of the busbar protection and the input and output analog wiring, and does not require changes to the internal sampling and logic processing judgment of the CPU. It only needs to be designed in accordance with the three-way completely independent processing and control system in the overall hardware and software architecture. The function is simple and reliable, and can effectively improve the safety and reliability of the operation of the protection device.

[0071] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0072] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0073] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0074] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0075] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0076] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0077] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0078] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. . Wherein, 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. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, 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. 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.

[0079] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A busbar protection device based on 2 out of 3, characterized in that: include: AC board, input board, output board, management board and 3 protection CPU boards; each protection CPU board is configured to complete sampling, perform AD conversion, complete AD conversion, perform CPU calculation and logic judgment, and finally control relay output, wherein each branch output is composed of any two CPU output nodes from 3 output nodes that are independent of CPU control; The AC board is configured to collect the AC electrical quantity of the protection area of ​​the busbar and transmit the AC electrical quantity to each of the protection CPU boards; The digital input board is configured to collect the digital input state of the protection area and transmit the digital input state to each of the protection CPU boards respectively; Each of the protection CPU boards is configured to calculate a logic judgment result based on the binary input state and the AC electrical quantity, and control the conduction of the corresponding output node according to the logic judgment result.

2. The busbar protection device according to claim 1, characterized in that: The AC board is also used to isolate the AC electrical quantity through an auxiliary converter and transmit the isolated AC electrical quantity to each of the protection CPU boards; The digital input board is also used to perform strong and weak electrical isolation on the digital input state, and transmit the digital input state after strong and weak electrical isolation to each of the protection CPU boards respectively.

3. The busbar protection device according to claim 2, characterized in that: Each of the protection CPU boards can realize AD conversion to convert the AC electrical quantity and the binary input quantity status from analog quantity into digital quantity, and provide the digital quantity of the binary input quantity status and the digital quantity of the AC electrical quantity to the protection CPU board, so that the protection CPU board calculates the logical judgment result according to the digital quantity of the binary input quantity status and the digital quantity of the AC electrical quantity.

4. The busbar protection device according to claim 1, characterized in that: The AC electrical quantity includes at least the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current of each branch connected to the busbar.

5. The busbar protection device according to claim 1, characterized in that: The binary input state at least includes the failure binary input signal of each branch.

6. The busbar protection device according to claim 1, characterized in that: Also includes a display module; The display module is used to display the logic judgment results calculated by each protection CPU board.

7. The busbar protection device according to any one of claims 1 to 6, characterized in that: The exit node is a relay exit node on the output plug-in; Each of the protection CPU boards is configured to control the relay output node on the output plug-in to close according to the logic judgment result, so that the output node corresponding to the protection CPU board is turned on.

8. A busbar protection method based on 2 out of 3, characterized in that: The method is applied to the busbar protection device as described in any one of claims 1 to 7 above, the busbar protection device comprises an AC board, an input board, an output board, a management board and three protection CPU boards; each of the protection CPU boards is configured to complete sampling to perform AD conversion, and complete the AD conversion to CPU execution calculation and logic judgment until controlling the relay outlet, wherein each of the branch outlets is composed of any two CPU outlet nodes in three outlet nodes independent of CPU control, and the method comprises: The AC board collects the AC electrical quantity of the protection area of ​​the busbar, and transmits the AC electrical quantity to each of the protection CPU boards respectively; The digital input board collects the digital input state of the protection area, and transmits the digital input state to each protection CPU board respectively; Each protection CPU board calculates a logic judgment result based on the binary input state and the AC electrical quantity, and controls the conduction of the corresponding output node according to the logic judgment result.

9. The busbar protection method according to claim 8, characterized in that: The AC board collects the AC electrical quantity of the bus and transmits the AC electrical quantity to each of the protection CPU boards respectively, including: The AC board collects the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current of each branch connected to the busbar, and transmits the instantaneous value of the A-phase current, the instantaneous value of the B-phase current, and the instantaneous value of the C-phase current to each of the protection CPU boards respectively; The step of collecting the binary input state of the protection area by the binary input board and transmitting the binary input state to each protection CPU board respectively includes: The branch failure input signal of the protection area is collected by the input board, and the branch failure input signal is transmitted to each protection CPU board respectively.

10. The busbar protection method according to claim 8 or 9, characterized in that: The method further comprises: Among the three export nodes controlled by the protection CPU board, any combination of two CPU export nodes maintains the protection function of the protection area of ​​the bus when the corresponding branch outlet is turned on.

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