Distribution system circuit breaker selection method and device, electronic equipment, and storage medium

Abstract

The present disclosure discloses a method for selecting circuit breakers in a distribution system, which relates to the field of distribution control technology. The specific implementation scheme is as follows: based on the configuration information of each circuit breaker in the tree-topology distribution system, the attribute data of each circuit breaker is determined, each circuit breaker is used as a node of the tree-topology structure, and the nodes in the tree-topology structure are traversed; in response to detecting that the current node is a non-leaf node based on the attribute data, all subordinate nodes of the current node are traversed, and the initial setting values ​​of all subordinate nodes and the maximum setting value among all the initial setting values ​​are obtained; the initial setting values ​​of all subordinate nodes are added to obtain the added setting value; based on the added setting value and the current setting value table, the selected setting value is determined; based on the selected setting value, the maximum setting value and the fully selective coordination table, the actual setting value and selection identification information of the current node are determined.

Description

Technical Field

[0001] The present invention belongs to the technical field of power distribution control, and in particular relates to a method and device for selecting a circuit breaker for a power distribution system, an electronic device, and a computer-readable storage medium. Background Art

[0002] Modern industrial enterprises and residential buildings typically house numerous electrical devices, including numerous low-voltage loads. The complex operating conditions of these low-voltage loads typically require a two- or three-level tree-like topology for power distribution and protection. When a system fault occurs, the faulty equipment must be quickly and selectively removed from the system to ensure normal operation of the remaining components. For terminal distribution systems primarily powered by low-voltage loads, selectivity is particularly crucial. The distribution system must be able to remove the faulty circuit without impacting the normal operation of loads in upstream or adjacent circuits.

[0003] Currently, when designing a terminal low-voltage distribution system with a tree topology, the setting value of the lowest-level circuit breaker is usually determined first based on the load conditions. The setting value of the upper-level circuit breaker is then reversed based on the determined setting value of the lower-level circuit breaker. In this case, the setting value of the upper-level circuit breaker is determined based on experience and lacks a clear selective coordination mechanism. In addition, the circuit breakers at each level determined by this setting method may result in poor control of the distribution system, which may cause the fault range of the distribution system to expand in the event of a short circuit.

[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0005] The purpose of the present disclosure is to solve the technical problem of poor selection effect of existing power distribution systems, and to provide a method for selecting circuit breakers in a power distribution system.

[0006] According to a first aspect of the present disclosure, a method for selecting circuit breakers in a distribution system is provided. The method comprises: determining attribute data of each circuit breaker based on configuration information of each circuit breaker in a tree-topology distribution system, treating each circuit breaker as a node of the tree-topology structure, and traversing the nodes in the tree-topology structure; in response to detecting that a current node is a non-leaf node based on the attribute data, traversing all subordinate nodes of the current node, and obtaining initial setting values ​​of all subordinate nodes and a maximum setting value among all initial setting values; adding the initial setting values ​​of all subordinate nodes to obtain an added setting value; determining a selected setting value based on the added setting value and a pre-calibrated current setting value table, the current setting value table being used to characterize a sorted sequence of current setting values ​​of different types of circuit breakers from different manufacturers; and determining an actual setting value and selection identification information of the current node based on the selected setting value, the maximum setting value, and a pre-calibrated fully selective coordination table, the fully selective coordination table being a coordination table determined by tripping curves of the circuit breaker and each circuit breaker in the current setting value table.

[0007] According to a second aspect of the present disclosure, there is provided a device for selecting a circuit breaker for a power distribution system, the device comprising: a traversal unit configured to determine attribute data of each circuit breaker based on configuration information of each circuit breaker in a tree-type topology power distribution system, take each circuit breaker as a node of a tree-type topology structure, and traverse the nodes in the tree-type topology structure; an acquisition unit configured to, in response to detecting that a current node is a non-leaf node based on the attribute data, traverse all subordinate nodes of the current node and acquire initial setting values ​​of all subordinate nodes and a maximum setting value among all initial setting values; an addition unit configured to add all subordinate nodes to the selected nodes; The initial setting values ​​of the lower-level nodes are added to obtain the added setting value; the setting determination unit is configured to determine the selected setting value based on the added setting value and a pre-calibrated current setting value table, where the current setting value table is used to characterize the sorted sequence of current setting values ​​of different types of circuit breakers from different manufacturers; the identification determination unit is configured to determine the actual setting value and selection identification information of the current node based on the selected setting value, the maximum setting value and a pre-calibrated complete selectivity coordination table, where the complete selectivity coordination table is a coordination table determined by the circuit breakers in the current setting value table and the tripping curves of each circuit breaker.

[0008] A third aspect of the present disclosure provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method described in any implementation manner of the first aspect.

[0009] A sixth aspect of the present disclosure provides a non-transitory computer-readable storage medium storing computer instructions, where the computer instructions are used to cause a computer to execute the method described in any implementation manner of the first aspect.

[0010] Compared with the prior art, the technical effects achieved by the present invention are as follows: a circuit breaker current setting value table and a complete selection coordination table are compiled according to the project conditions, and the actual setting values ​​of the circuit breakers in the distribution system are generated by using the control process of external input parameters, so that the upper and lower circuit breakers can achieve complete selectivity and are not affected by the conditions of the lower-level loop cables. Even if a proximal short circuit occurs within the protection range of the lower-level circuit breaker and the maximum possible fault current is generated, it can still be ensured that the lower-level circuit breaker operates while the upper-level circuit breaker does not operate, thereby improving the selection effect of the circuit breakers in the distribution system and improving the safety of the distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a flow chart of an embodiment of a method for selecting a circuit breaker for a power distribution system according to the present disclosure;

[0012] Figure 2 This is a structural diagram of a tree-type topology power distribution system in the present disclosure;

[0013] Figure 3 is a flow chart of another embodiment of a method for selecting a circuit breaker for a power distribution system according to the present disclosure;

[0014] Figure 4 1 is a structural schematic diagram of an embodiment of a circuit breaker selection device for a power distribution system according to the present disclosure;

[0015] Figure 5 4 is a block diagram of an electronic device used to implement the method for selecting a circuit breaker for a power distribution system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0016] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0017] The technical solutions of the present invention are described below by means of specific embodiments. It should be understood that one or more steps mentioned in the present invention do not exclude the presence of other methods and steps before and after the combination step, or other methods and steps may be inserted between these explicitly mentioned steps. It should also be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. Unless otherwise specified, the numbering of each method step is only for the purpose of identifying each method step, and does not limit the order of arrangement of each method or the scope of implementation of the present invention. Changes or adjustments in their relative relationships can also be regarded as the scope of implementation of the present invention without substantial changes in the technical content.

[0018] The sources of the raw materials and instruments used in the examples are not particularly limited and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0019] Explanation of relevant terms:

[0020] Tree-type topology distribution system: A widely used topology in terminal distribution systems. A topology in which an upper-level circuit breaker protects one or more branch circuits with lower-level circuit breakers and the busbars, ladder cables, or comb-type busbars at the incoming line of the branch circuit breaker. Lower-level circuit breakers installed on the branch line protect the branch circuit breaker. A distribution system with this topology.

[0021] Low-voltage circuit breaker setting: The threshold at which a low-voltage circuit breaker trips, primarily the current threshold in this disclosure. This value determines the circuit breaker's tripping characteristics. Some circuit breakers have an adjustable setting, providing discrete percentages of the breaker's rated current multiplied by the rated current. Other circuit breakers have a non-adjustable setting, meaning the setting is the breaker's rated value.

[0022] Protection selectivity: In a distribution system composed of multiple low-voltage circuit breakers, if a fault occurs somewhere within the protection range of a lower-level circuit breaker (including lines and loads), only the circuit breaker at that level will operate without causing the upper-level circuit breaker to operate. This means that only the faulty circuit will be disconnected without affecting other normally operating circuits. Whether a distribution system can achieve selectivity is generally related to the setting of the circuit breaker at that level, the setting of the upper-level circuit breaker, the location of the fault within the protection range of the circuit breaker at that level, the impedance of the cable, and the impedance of the load.

[0023] Full selectivity: All possible fault types within the protection range of this level of circuit breaker, from overload to non-resistance short-circuit current (short-circuit current from small to large), regardless of proximal short circuit or overload and distal short circuit or overload, this level of circuit breaker can be disconnected without the upper level circuit breaker operating.

[0024] Partial selectivity: It cannot meet the requirements of full selectivity. However, when certain lower fault current faults occur (such as remote short circuit or load overload), the circuit breaker at this level will trip while the upper circuit breaker will not operate, thus achieving selectivity. However, when certain higher fault current faults occur (such as local short circuit), selectivity cannot be achieved.

[0025] No selectivity: All possible fault types that occur within the protection range of this level of circuit breaker cannot be selectively protected.

[0026] Circuit breaker trip curve: This curve reflects the breaking characteristics of a circuit breaker at a certain setting. Generally, the horizontal axis is current and the vertical axis is time. This curve reflects the relationship between the fault current and the operating time of the circuit breaker.

[0027] In the prior art, when designing a terminal low-voltage distribution system with a tree topology, the setting value of the lowest-level circuit breaker is usually determined first based on the load conditions. The setting value of the upper-level circuit breaker is then reversely deduced based on the determined setting value of the lower-level circuit breaker. Typically, the upper-level circuit breaker adopts a setting method that is at least one level larger than the current setting value of the lower-level circuit breaker; or the current setting value is adjusted based on the designer's experience; or an action time limit setting value is added to the upper-level circuit breaker.

[0028] In actual engineering practice, achieving full selectivity in a multi-level tree topology distribution system faces various specific difficulties, including but not limited to the following:

[0029] During the power distribution system design process, input data is not always complete. Information such as the actual specifications and lengths of cables in each circuit can cause the circuit breaker setting to be too low or too high. Changes in process equipment selection can cause load fluctuations, leading to changes in the expected fault current in the original circuit. Changes in process equipment grouping can also lead to changes in the system topology. These situations can make it difficult to find the optimal setting for the upper-level circuit breaker.

[0030] If the setting value of the upper-level short-circuit breaker is too large, the cost of the busbar, cable or comb busbar between the upper and lower levels will increase.

[0031] If the upper circuit breaker setting is too low, then when a short circuit occurs at the lower level and the fault current is large, the lower and upper circuit breakers may operate simultaneously, which means only partial selectivity. Or even if a remote short circuit or load overload occurs, the lower and upper circuit breakers may operate simultaneously, which means no selectivity.

[0032] If, in a low-voltage distribution system composed of multiple circuit breakers, an operating time limit is added to the upper-level circuit breaker to ensure complete selectivity, then as the number of distribution system levels increases, once the lower-level circuit breaker fails to reliably disconnect, the time the fault current exists in the circuit will be greatly increased, reducing the protection of the load and line. In addition, the operating time limit of the uppermost circuit breaker in the multi-level low-voltage system may be too long, causing the medium-voltage side protection of the distribution transformer to be activated, thereby expanding the scope of the system fault.

[0033] In view of the deficiencies in the prior art, the present disclosure provides a method for selecting circuit breakers for a power distribution system. Figure 1 A process 100 of an embodiment of a method for selecting a circuit breaker for a power distribution system is shown. The method for selecting a circuit breaker for a power distribution system includes the following steps:

[0034] Step 101: determine attribute data of each circuit breaker based on configuration information of each circuit breaker in a tree topology power distribution system, take each circuit breaker as a node of a tree topology structure, and traverse the nodes in the tree topology structure.

[0035] In this embodiment, a tree-topology power distribution system is a hierarchical power distribution system to be designed. In the tree-topology power distribution system, the top is the root node (such as the power supply end), and multiple sub-branches extend downward. Each branch can be connected to a sub-node (load or equipment). No closed loop is formed between the levels, and the data transmission path is unidirectional or bidirectional.

[0036] In this embodiment, the tree-topology distribution system can be a subsystem obtained by improving the non-tree-topology distribution system. For example, in the non-tree-topology distribution system, there is a part of the subsystem from a certain node to all its subordinate nodes, all the way to the leaf node, which is a tree topology structure. This part of the subsystem can be directly extracted as a tree-topology distribution system.

[0037] In this embodiment, the tree-type topology distribution system includes multiple circuit breakers, and each circuit breaker needs to be selected. In order to achieve full selectivity of all circuit breakers in the tree-type topology distribution system, it is necessary to select all circuit breakers so that the selected circuit breakers corresponding to the actual setting values ​​and selection identification information can meet full selectivity.

[0038] like Figure 2 The figure below shows a schematic diagram of a tree-topology power distribution system. This diagram is a single-line system diagram. The lines in the diagram only represent the logical hierarchy of components and do not represent the actual number of cable phases. Component 0 is the power transformer, which can be understood as the system power supply. The power distribution system includes circuit breakers 1 through 7, the power supply circuits in between, and the loads under each circuit breaker. Circuit breaker 1 is the root node in the tree topology, while circuit breakers 2, 3, 5, 6, and 7 are leaf nodes. Circuit breaker 1 is the parent node of circuit breakers 2, 3, and 4; circuit breaker 4 is the parent node of circuit breakers 5, 6, and 7. Circuit breakers 2, 3, and 4 are subordinate nodes (child nodes) of circuit breaker 1; and circuit breakers 5, 6, and 7 are subordinate nodes (child nodes) of circuit breaker 4.

[0039] exist Figure 2 In this example, if a short circuit occurs in the line below circuit breaker 6, the short-circuit current will flow from the power transformer (element 0) through circuit breaker 1, the line between circuit breaker 1 and circuit breaker 4, the short circuit in circuit 4, the line between circuit breaker 4 and circuit breaker 6, and finally circuit breaker 6. If circuit breaker 6 operates and none of the other breakers operate when this short circuit occurs, the protection is considered selective. If circuit breaker 6 operates and either circuit breakers 4 or 1 operate, or both circuit breakers 4 and 1 operate, the protection is considered non-selective.

[0040] In this embodiment, the configuration information of the circuit breaker is the setting information of the circuit breaker obtained before the circuit breaker is selected. The configuration information includes: the circuit breaker number, the number of child nodes contained in the node corresponding to the circuit breaker in the tree-topology power distribution system, the branch of the node corresponding to the circuit breaker in the tree-topology power distribution system, the parent node number of the node corresponding to the circuit breaker in the tree-topology power distribution system, etc. The positional relationship of each circuit breaker in the tree-topology power distribution system can be determined through the configuration information. The attribute data is used to reflect the attributes of each circuit breaker in the tree-topology power distribution system. For example, the attribute data includes: whether it is a leaf node, whether it is a non-leaf node, and if it is a non-leaf node, the sub-attribute data of its child nodes. The above-mentioned determination of the attribute data based on the configuration information includes: in response to the child node contained in the current circuit breaker not being a circuit breaker, determining that the current circuit breaker is a leaf node in the attribute topology structure formed by the circuit breaker.

[0041] In this embodiment, the tree topology is a new topology structure formed by extracting all circuit breakers in the tree topology distribution system and using all the circuit breakers as nodes. The nodes in the tree topology can be traversed in a certain order, such as starting from the leaf nodes of the tree topology.

[0042] Step 102 : In response to detecting that the current node is a non-leaf node based on the attribute data, traverse all subordinate nodes of the current node, and obtain initial setting values ​​of all subordinate nodes and a maximum setting value among all initial setting values.

[0043] In this embodiment, a non-leaf node refers to a node with child nodes in the lower layer in the tree topology structure. When there is only one child node in the lower layer of the non-leaf node in the tree topology structure that is a leaf node, the initial setting value of the leaf node can be directly obtained through the load of the leaf node in the tree topology distribution system, and the initial setting value is used as the maximum setting value.

[0044] In this embodiment, when there are multiple layers of child nodes under the non-leaf node in the tree topology structure, the distribution system circuit breaker selection method disclosed in this disclosure is adopted starting from the child nodes of the adjacent leaf nodes to obtain the actual setting value of each child node, and the largest value is selected from the actual setting values ​​of all child nodes as the maximum setting value.

[0045] Step 103: Add the initial setting values ​​of all lower-level nodes to obtain a summed setting value.

[0046] In this embodiment, when the initial setting values ​​of all lower-level nodes have only one value, the value is directly added to zero, or the initial setting value is directly used as the added setting value.

[0047] In this embodiment, when the initial setting values ​​of all lower-level nodes have multiple values, the multiple values ​​are summed to obtain the added setting value.

[0048] Step 104 : Determine the selected setting value based on the added setting value and a pre-calibrated current setting value table.

[0049] In this embodiment, the current setting value table is used to represent the sorted sequence of current setting values ​​for different types of circuit breakers from different manufacturers. The selected setting value is the current setting value selected for the current node with reference to the current setting value table and can be matched with the selective coordination table.

[0050] In this embodiment, in this optional implementation, the above-mentioned current setting value table is calibrated through the following steps: determining the models and manufacturers of all circuit breakers in the power distribution system; arranging all circuit breakers in order of the current setting values ​​of each circuit breaker; and responsive to circuit breakers having the same current setting value among all circuit breakers, arranging the current setting values ​​of the circuit breakers according to their costs.

[0051] Specifically, all low-voltage circuit breaker models that may be used in the distribution system can be listed and arranged from small to large according to the setting value. If there are circuit breakers of different types with the same setting value, they can be arranged from low to high according to their cost, and numbered from 1 to n, where the number represents the circuit breaker model of different manufacturers, and the corresponding current setting value is recorded as I[1] to I[n], where n>1. This is shown in Table 1.

[0052] Table 1

[0053]

[0054] In this embodiment, step 104 includes sequentially comparing the summed set value with the current set values ​​in the current set value table. In response to detecting that the summed set values ​​are all greater than the current set values ​​in the current set value table, determining that the current node does not meet full selectivity, determining an actual set value for the current node based on maximum partial selectivity, and selecting a set value equal to the last current set value in the current set value table.

[0055] Step 105 : Determine the actual setting value and selection identification information of the current node based on the selected setting value, the maximum setting value and the pre-calibrated complete selectivity coordination table.

[0056] In this embodiment, the full selectivity coordination table is a coordination table determined by the circuit breakers in the current setting value table and the tripping curves of each circuit breaker. The full selectivity coordination table is used to indicate whether full selectivity is achieved between multiple circuit breakers. The full selectivity coordination table can be used to determine the circuit breakers that meet full selectivity.

[0057] In this embodiment, the calibration process of the complete selectivity coordination table is as follows: the row numbers are recorded as lower-level circuit breakers, denoted as D[1] to D[n], and the column numbers are recorded as upper-level circuit breakers, denoted as U[1] to U[n], to compile a complete selectivity coordination table. The complete selectivity coordination table is a table with n rows and n columns of data, as shown in Table 2 below:

[0058] Table 2

[0059]

[0060] Because the upper circuit breaker must be at least larger than the lower circuit breaker, the lower left portion of the table contains invalid data and is marked as "Null." The upper right portion of the table is compiled based on the coordination table or tripping curve provided in the circuit breaker catalog.

[0061] In this embodiment, the circuit breaker has a time-current characteristic. Generally, the tripping curve of the circuit breaker has a horizontal axis representing the current value, represented by *In, where In is the rated current of the circuit breaker, that is, the multiple of the rated current is the horizontal axis coordinate. The vertical axis represents time, in seconds. The calibration principle of the fully selective coordination table is as follows: the tripping curves of two different circuit breakers are plotted in the same time / current coordinate system with a unified coordinate scale. If the two tripping curves have no intersection, the curve on the lower left side is added with the total action time corresponding to the circuit breaker (the time from the energization of the circuit breaker tripping coil to the extinction of all phase arcs of the short-circuit current), resulting in the curve corresponding to the lower circuit breaker being shifted upward. If the curves of the two circuit breakers still have no intersection after the upward shift, then it can be considered that the two circuit breakers have full selectivity.

[0062] Whether the lower-level circuit breaker can form complete selectivity with the upper-level circuit breaker can be determined based on three conditions in the product data:

[0063] ① The setting value of a certain type of circuit breaker indicates at least how much setting value it has complete selectivity with circuit breakers of the same type.

[0064] ② A certain type of circuit breaker does not indicate at what setting value it must meet the requirement of full selectivity compared with circuit breakers of the same type at a certain setting value. This is determined by plotting the product tripping curve in the same tripping curve coordinate system. The lower-level circuit breaker increases the tripping curve offset according to the total operating time. If the tripping curves of the upper and lower circuit breakers do not intersect, it is considered that the full selectivity requirement is met; if there is an intersection, it is considered that the full selectivity requirement is not met.

[0065] ③ For two circuit breakers of different types, the tripping curves of the products are plotted in the same tripping curve coordinates. The tripping curve offset of the lower circuit breaker is increased according to the total operating time. If the two tripping curves of the circuit breaker have no intersection, it has full selectivity; otherwise, if there is an intersection, it is considered that the full selectivity requirement is not met.

[0066] If the superior and subordinate can achieve complete selectivity, the corresponding position in the table is recorded as "1", if not, it is recorded as "0".

[0067] It should be noted that the coordination table provided with the circuit breaker catalog also shows the selectivity of the two types of circuit breakers. The rows are numbered for the upper circuit breaker, and the columns are numbered for the lower circuit breaker. For example, a "T" in the table indicates that the upper and lower circuit breakers have full selectivity. A number in the table indicates that the upper and lower circuit breakers have only partial selectivity. The number indicates that the upper and lower circuit breakers are only selective when the short-circuit current passing through the upper and lower circuit breakers is less than this value. Blank cells in the table indicate that the corresponding upper and lower circuit breakers have no selectivity.

[0068] The content of the fully selective coordination table disclosed herein can be similar to the coordination table provided in the circuit breaker catalog, but only includes full selectivity. That is, the information containing "T" in the coordination table provided in the circuit breaker catalog is filled in as 1 in the fully selective coordination table disclosed herein. Other information with only partial selectivity or no selectivity is filled in as 0 in the fully selective coordination table disclosed herein.

[0069] In this embodiment, the actual setting value is the optimal current setting value or the current setting value that satisfies complete selectivity determined for the circuit breaker corresponding to the current node in the tree topology.

[0070] In this embodiment, the above-mentioned step 105 includes: matching the selected setting value and the maximum setting value with the current setting value in the complete selectivity matching table respectively; in response to both being successfully matched, detecting whether the selected setting value and the maximum setting value both meet the complete selectivity in the complete selectivity matching table; in response to detecting that both the selected setting value and the maximum setting value both meet the complete selectivity, using the selected setting value as the actual setting value of the current node, and using the manufacturer and circuit breaker model of the upper-level circuit breaker corresponding to the selected setting value and the maximum setting value as selection identification information.

[0071] The present disclosure provides a method for selecting a circuit breaker for a distribution system. First, based on the configuration information of each circuit breaker in the tree-topology distribution system, the attribute data of each circuit breaker is determined, each circuit breaker is used as a node of the tree-topology structure, and the nodes in the tree-topology structure are traversed. Second, in response to detecting that the current node is a non-leaf node based on the attribute data, all subordinate nodes of the current node are traversed, and the initial setting values ​​of all subordinate nodes and the maximum setting value among all initial setting values ​​are obtained. Third, the initial setting values ​​of all subordinate nodes are added to obtain an added setting value. Then, based on the added setting value and a pre-calibrated current setting value table, a selected setting value is determined. The current setting value table is used to characterize the sorted sequence of current setting values ​​of different types of circuit breakers from different manufacturers. Finally, based on Select the setting value, maximum setting value and pre-calibrated full selectivity coordination table to determine the actual setting value and selection identification information of the current node. The full selectivity coordination table is a coordination table determined by the circuit breaker in the current setting value table and the tripping curve of each circuit breaker. Prepare the circuit breaker current setting value table and the full selection coordination table according to the project situation, and use the control process of external input parameters to generate the actual setting value of the circuit breaker in the distribution system. This can make the upper and lower circuit breakers fully selective and not be affected by the situation of the lower loop cable. Even if a proximal short circuit occurs within the protection range of the lower circuit breaker and the maximum possible fault current is generated, it can still ensure that the lower circuit breaker operates while the upper circuit breaker does not operate, thereby improving the selection effect of the circuit breaker in the distribution system and improving the safety of the distribution system.

[0072] In some embodiments of the present disclosure, the above-mentioned determination of the actual setting value and selection identification information of the current node based on the selected setting value, the maximum setting value and the pre-calibrated full selectivity coordination table includes: detecting whether the selected setting value satisfies the full selectivity based on the selected setting value, the maximum setting value and the pre-calibrated full selectivity coordination table; in response to detecting that the selected setting value satisfies the full selectivity, using the selected setting value as the actual setting value of the current node; and determining the selection identification information of the current node according to the actual setting value of the current node and the tripping curve of the current node.

[0073] In this optional implementation, the full selectivity coordination table records information on whether the two setting values ​​meet the full selectivity. After obtaining the selected setting value and the maximum setting value, the selected setting value and the maximum setting value are matched with the setting values ​​in the full selectivity coordination table respectively. When the selected setting value and the maximum setting value are matched with the setting values ​​in the full selectivity coordination table, the full selectivity of the two setting values ​​in the table is determined through full selectivity matching, and whether the selected setting value and the maximum setting value meet the full selectivity is detected.

[0074] In this optional implementation, the selection identification information is the selection information of the circuit breaker, which includes information such as the manufacturer and model of the circuit breaker corresponding to the current node. After determining the actual setting value and tripping curve, the selection identification information of the current node can be obtained by matching the two with the circuit breaker information of different manufacturers.

[0075] The present disclosure provides a method for determining the actual set value and selection identification information of the current node. The method detects whether the selected set value satisfies full selectivity based on the selected set value, the maximum set value, and a pre-calibrated full selectivity coordination table. In response to detecting that the selected set value satisfies full selectivity, the selected set value is used as the actual set value of the current node. The selection identification information of the current node is determined based on the actual set value of the current node and the tripping curve of the current node, thereby providing a reliable implementation method for obtaining the actual set value and selection identification information.

[0076] In some optional implementations of the present disclosure, the above-mentioned detection of whether the selection setting value satisfies the full selectivity based on the selection setting value, the maximum setting value and the pre-calibrated full selectivity matching table includes: matching the row value of the pre-calibrated full selection configuration table with the selection setting value to obtain a matching row value; matching the column value of the full selection configuration table with the maximum setting value to obtain a matching column value; detecting whether the marked value corresponding to the matching row value and the matching column value in the full selection configuration table indicates full selectivity; and determining that the selection setting value satisfies the full selectivity in response to the marked value indicating full selectivity.

[0077] In this optional implementation, the information in the circuit breaker full selectivity coordination table (such as the table shown in Table 2) is used to determine whether the selection setting value of the current node and the maximum setting value of the child node can form full selectivity, by the following method: substitute the selection setting value corresponding to I[z] into the corresponding row number in Table 2, substitute the maximum setting value into the corresponding column number in Table 2, query the data of the corresponding row and column in the table, if it is 1, then full selectivity is satisfied, if not 1, then full selectivity is not satisfied.

[0078] This optional implementation provides a method for detecting whether the selection setting value satisfies complete selectivity, matching the row value of a pre-calibrated complete selection configuration table with the selection setting value to obtain a matching row value; matching the column value of the complete selection configuration table with the maximum setting value to obtain a matching column value; detecting whether the marked value corresponding to both the matching row value and the matching column value in the complete selection configuration table indicates complete selectivity; and determining that the selection setting value satisfies complete selectivity in response to the marked value indicating complete selectivity, thereby providing a reliable implementation method for detecting complete selectivity.

[0079] In some embodiments of the present disclosure, the above method also includes: in response to detecting that the selected setting value does not meet the full selectivity, determining a new selected setting value based on the added setting value and the current setting value table; using the new selected setting value as the selected setting value, and continuing to detect whether the selected setting value meets the full selectivity based on the selected setting value, the maximum setting value and a pre-calibrated full selectivity coordination table until all current setting values ​​in the current setting value table are detected; in response to all current setting values ​​in the current setting value table being detected, using the current selected setting value as the actual setting value, and determining the selection identification information of the current node based on the current selected setting value and the tripping curve of the current node.

[0080] Figure 3 A process 300 of another embodiment of a method for selecting a circuit breaker for a power distribution system is shown. The method for selecting a circuit breaker for a power distribution system includes the following steps:

[0081] Step 301 : Based on the configuration information of each circuit breaker in the tree topology power distribution system, determine the attribute data of each circuit breaker, take each circuit breaker as a node of the tree topology structure, and traverse the nodes in the tree topology structure. Then, execute step 302 .

[0082] Step 302, in response to detecting that the current node is a non-leaf node based on the attribute data, traverse all subordinate nodes of the current node, and obtain the initial setting values ​​of all subordinate nodes and the maximum setting value among all the initial setting values, and then execute step 303.

[0083] In step 303 , the initial setting values ​​of all lower-level nodes are added together to obtain an added setting value, and then step 304 is executed.

[0084] Step 304 , based on the added set value and the pre-calibrated current set value table, determine the selected set value, and then execute step 305 .

[0085] In this embodiment, the current setting value table is used to represent the sorting sequence of current setting values ​​of different types of circuit breakers from different manufacturers.

[0086] Step 305 , based on the selected set value, the maximum set value and the pre-calibrated full selectivity matching table, detect whether the selected set value satisfies full selectivity; if so, execute step 306 ; if not, execute step 309 .

[0087] In step 306 , the set value is selected as the actual set value of the current node, and then step 307 is executed.

[0088] Step 307 : Determine the selection identification information of the current node according to the actual setting value of the current node and the tripping curve of the current node, and then execute step 308 .

[0089] Step 308, end.

[0090] Step 309 , checking whether all current setting values ​​in the current setting value table have been checked; if not, executing step 310 ; if so, executing step 311 .

[0091] In this embodiment, a selected setting value whose current value is greater than or equal to the added setting value is selected in the current setting value table. The selected setting value is compared with the maximum setting value in the node below the current node, and the circuit breaker full selectivity coordination table is queried. If the full selectivity can be met, the value is used as the actual current setting value of the current node. If it cannot be met, the setting value of the next higher level is selected and the comparison is continued until the full selectivity is met or the maximum partial selectivity is met if the full selectivity cannot be met, and finally the actual setting value of the current node is returned.

[0092] In step 310 , a new selected setting value is determined based on the added setting value and the current setting value table, and the new selected setting value is used as the selected setting value. Thereafter, step 305 is executed.

[0093] In this embodiment, all lower-level nodes are traversed, and the actual setting values ​​of the lower-level nodes are obtained, and then the actual setting values ​​of the lower-level nodes are added to obtain the added setting value of the current node.

[0094] In this embodiment, the added setting value is compared with the current setting value in the current setting value table, that is, the current setting value is selected from the current setting value table as the new selected setting value.

[0095] Step 311 : Use the current selected setting value as the actual setting value, and determine the selection identification information of the current node based on the current selected setting value and the tripping curve of the current node, and then execute step 308 .

[0096] In this embodiment, if all current setting values ​​in the current setting value table have been checked, it indicates that even if the maximum current value in the circuit breaker current setting value table (Table 1) is selected, the selected setting value for the current node still cannot achieve full selectivity. In this case, the selected setting value corresponding to the existing I[z] (where I[z] equals I[n]) is used as the final actual setting value for the current node. Although this result does not meet the requirement for full selectivity, it can achieve maximum selectivity among all available circuit breaker models. The current selected setting value can be the last current setting value in the table obtained after comparison with the current setting value table. This value may not guarantee full selectivity, but it can ensure maximum selectivity.

[0097] On the basis of achieving complete selectivity, the setting value of the upper-level circuit breaker is minimized. The selection of the setting value of the upper-level circuit breaker will affect the current-carrying capacity selection of the busbars, cables or comb busbars between the upper and lower levels. Minimizing the upper-level circuit breaker can effectively reduce the cost of the busbars, cables or comb busbars between each level.

[0098] The distribution system circuit breaker selection method provided by this embodiment detects that the selected setting value does not meet full selectivity, and determines a new selected setting value based on the added setting value and the current setting value table. The new selected setting value is used as the selected setting value, and the selected setting value is continuously tested based on the selected setting value, the maximum setting value, and a pre-calibrated full selectivity coordination table to determine whether the selected setting value meets full selectivity until all current setting values ​​in the current setting value table are tested, thereby improving the reliability of the selected setting value selection.

[0099] In some embodiments of the present disclosure, the above method also includes: in response to detecting that the current node is a leaf node based on attribute data, determining the load capacity, sample rated current and startup characteristics of the current node based on the attribute data of the current node; based on the load capacity, sample rated current and startup characteristics, determining the actual setting value and selection identification information of the current node.

[0100] In this embodiment, the above-mentioned determination of the actual setting value, manufacturer, and circuit breaker model of the current node based on the load capacity, sample rated current, and starting characteristics includes: determining the load rated current based on the load capacity; detecting whether the sample rated current is greater than the load rated current; in response to detecting that the sample rated current is greater than the load rated current, determining the tripping curve type of the current node based on the starting characteristics; using the setting value that satisfies both the sample rated current and the tripping curve type as the actual setting value of the current node, and determining the circuit breaker model of the current node based on the actual setting value and the tripping curve type of the current node.

[0101] In this embodiment, the setting value of the circuit breaker of the lowest level circuit of the power distribution system is determined according to the rated load capacity, rated current and starting characteristics of the circuit. According to the circuit breaker sample, the appropriate rated current of the circuit breaker is selected so that the rated current of the lowest level circuit breaker is greater than the load rated current, meeting the load rated capacity requirement, and the appropriate tripping curve type is selected so that the circuit breaker tripping curve can avoid the maximum starting current and normal operating current that may be generated by the load. The distribution system circuit breaker selection method provided by this embodiment, in response to detecting that the current node is a leaf node based on attribute data, determines the load capacity, sample rated current and starting characteristics of the current node based on the attribute data of the current node; based on the load capacity, sample rated current and starting characteristics, determines the actual setting value and selection identification information of the current node, providing another reliable implementation method for obtaining the actual setting value and selection identification information of the current node.

[0102] In some optional implementations of the present disclosure, in response to detecting that the current node is a non-leaf node based on attribute data, traversing all subordinate nodes of the current node, and obtaining the initial setting values ​​of all subordinate nodes and the maximum setting value among all initial setting values ​​include: in response to detecting that the current node is a non-leaf node based on attribute data, traversing all subordinate nodes of the current node; in response to the subordinate node being a leaf node, obtaining the initial setting value of the subordinate node based on the attribute data of the subordinate node; in response to the subordinate node being a non-leaf node, calculating the actual setting value of the subordinate node, and using the actual setting value of the subordinate node as the initial setting value of the subordinate node; after obtaining the initial setting values ​​of all subordinate nodes, comparing the initial setting values ​​of all subordinate nodes, and using the largest initial setting value as the maximum setting value.

[0103] The method for obtaining the initial setting value and the maximum setting value provided by this optional implementation method provides the process of obtaining the initial setting value and the maximum setting value respectively for the case where the lower-level node is a leaf node or a non-leaf node, thereby improving the comprehensiveness and reliability of obtaining the initial setting value and the maximum setting value.

[0104] In some optional implementations of the present disclosure, determining the selected setting value based on the added setting value and a pre-calibrated current setting value table includes: sequentially obtaining current setting values ​​from a pre-calibrated current setting value table; detecting whether the obtained current setting value is greater than the added setting value; and in response to detecting that the obtained current setting value is greater than the added setting value, using the obtained current setting value as the selected setting value.

[0105] The method for determining the selected setting value provided by this optional implementation sequentially obtains current setting values ​​from a pre-calibrated current setting value table; detects whether the obtained current setting value is greater than the added setting value; and in response to detecting that the obtained current setting value is greater than the added setting value, uses the obtained current setting value as the selected setting value, thereby improving the reliability of obtaining the selected setting value.

[0106] Optionally, in response to detecting that the acquired current setting value is less than the added setting value, a new current setting value is continuously acquired from the current setting table according to the current sequence.

[0107] Further references Figure 4 As an implementation of the methods shown in the above figures, the present disclosure provides an embodiment of a distribution system circuit breaker selection device, which is similar to Figure 1 Corresponding to the method embodiment shown, the device can be specifically applied to various electronic devices.

[0108] like Figure 4As shown, the distribution system circuit breaker selection device 400 provided in this embodiment includes: a traversal unit 401, an acquisition unit 402, an addition unit 403, a setting determination unit 404, and an identification determination unit 405. The traversal unit 401 can be configured to determine the attribute data of each circuit breaker based on the configuration information of each circuit breaker in the tree topology distribution system, treat each circuit breaker as a node of the tree topology structure, and traverse the nodes in the tree topology structure. The acquisition unit 402 can be configured to, in response to detecting that the current node is a non-leaf node based on the attribute data, traverse all subordinate nodes of the current node and obtain the initial setting values ​​of all subordinate nodes and the maximum setting value among all initial setting values. The addition unit 403 can be configured to add the initial setting values ​​of all subordinate nodes to obtain an added setting value. The setting determination unit 404 can be configured to determine the selected setting value based on the added setting value and a pre-calibrated current setting value table. The current setting value table is used to represent the sorted sequence of current setting values ​​for different types of circuit breakers from different manufacturers. The identification determination unit 405 can be configured to determine the actual setting value and selection identification information for the current node based on the selected setting value, the maximum setting value, and a pre-calibrated complete selectivity coordination table. The complete selectivity coordination table is a coordination table determined by the circuit breakers and tripping curves of each circuit breaker in the current setting value table.

[0109] In this embodiment, the specific processing and technical effects of the traversal unit 401, the acquisition unit 402, the addition unit 403, the setting determination unit 404, and the identification determination unit 405 in the distribution system circuit breaker selection device 400 can be referred to respectively. Figure 1 The relevant descriptions of step 101, step 102, step 103, step 104 and step 105 in the corresponding embodiment are not repeated here.

[0110] In one embodiment of the present disclosure, the identification determination unit 405 is configured to: detect whether the selected setting value satisfies full selectivity based on the selected setting value, the maximum setting value, and a pre-calibrated full selectivity coordination table; in response to detecting that the selected setting value satisfies full selectivity, use the selected setting value as the actual setting value of the current node; and determine the selection identification information of the current node based on the actual setting value of the current node and the tripping curve of the current node.

[0111] In one embodiment of the present disclosure, the above-mentioned identification determination unit 405 is configured to: match the row value of the pre-calibrated complete selection configuration table with the selection setting value to obtain a matching row value; match the column value of the complete selection configuration table with the maximum setting value to obtain a matching column value; detect whether the marked value corresponding to the matching row value and the matching column value in the complete selection configuration table represents complete selectivity; in response to the marked value representing complete selectivity, determine that the selection setting value satisfies complete selectivity.

[0112] In one embodiment of the present disclosure, the distribution system circuit breaker selection device 400 further includes a detection unit (not shown), the detection unit being configured to: in response to detecting that the selected setting value does not satisfy full selectivity, determine a new selected setting value based on the added setting value and the current setting value table; use the new selected setting value as the selected setting value, and continue to detect whether the selected setting value satisfies full selectivity based on the selected setting value, the maximum setting value, and a pre-calibrated full selectivity coordination table until all current setting values ​​in the current setting value table have been tested; and in response to all current setting values ​​in the current setting value table having been tested, use the current selected setting value as the actual setting value, and determine the selection identification information of the current node based on the current selected setting value and the tripping curve of the current node.

[0113] In one embodiment of the present disclosure, the distribution system circuit breaker selection device 400 further includes: a leaf setting unit (not shown in the figure), which is configured to: in response to detecting that the current node is a leaf node based on attribute data, determine the load capacity, sample rated current and startup characteristics of the current node based on the attribute data of the current node; and determine the actual setting value and selection identification information of the current node based on the load capacity, sample rated current and startup characteristics.

[0114] In one embodiment of the present disclosure, the acquisition unit 402 is further configured to: in response to detecting that the current node is a non-leaf node based on attribute data, traverse all subordinate nodes of the current node; in response to the subordinate node being a leaf node, obtain the initial setting value of the subordinate node based on the attribute data of the subordinate node; in response to the subordinate node being a non-leaf node, calculate the actual setting value of the subordinate node, and use the actual setting value of the subordinate node as the initial setting value of the subordinate node; after obtaining the initial setting values ​​of all subordinate nodes, compare the initial setting values ​​of all subordinate nodes, and use the largest initial setting value as the maximum setting value.

[0115] In one embodiment of the present disclosure, the above-mentioned adding unit 403 is further configured to: sequentially obtain current setting values ​​from a pre-calibrated current setting value table; detect whether the obtained current setting value is greater than the added setting value; in response to detecting that the obtained current setting value is greater than the added setting value, use the obtained current setting value as the selected setting value.

[0116] In the present embodiment, the embodiment of the present disclosure provides a distribution system circuit breaker selection device. First, the traversal unit 401 determines the attribute data of each circuit breaker based on the configuration information of each circuit breaker in the tree topology distribution system, takes each circuit breaker as a node of the tree topology structure, and traverses the nodes in the tree topology structure; secondly, the acquisition unit 402 traverses all subordinate nodes of the current node in response to detecting that the current node is a non-leaf node based on the attribute data, and obtains the initial setting values ​​of all subordinate nodes and the maximum setting value among all initial setting values; thirdly, the addition unit 403 adds the initial setting values ​​of all subordinate nodes to obtain the added setting value; then, the setting determination unit 404 determines the selected setting value based on the added setting value and a pre-calibrated current setting value table, where the current setting value table is used to characterize the current of different types of circuit breakers from different manufacturers. finally, the identification determination unit 405 determines the actual setting value and selection identification information of the current node based on the selected setting value, the maximum setting value and the pre-calibrated full selectivity coordination table. The full selectivity coordination table is a coordination table determined by the circuit breaker in the current setting value table and the tripping curve of each circuit breaker. The circuit breaker current setting value table and the full selection coordination table are compiled according to the project situation. The actual setting value of the circuit breaker in the distribution system is generated by the control process of the external input parameters. This can make the upper and lower circuit breakers fully selective and not be affected by the situation of the lower loop cable. Even if a near-end short circuit occurs within the protection range of the lower circuit breaker and the maximum possible fault current is generated, it can still be ensured that the lower circuit breaker is operated while the upper circuit breaker does not operate, thereby improving the selection effect of the circuit breaker in the distribution system and improving the safety of the distribution system.

[0117] According to an embodiment of the present disclosure, the present disclosure also provides an electronic device, a readable storage medium, and a computer program product.

[0118] Figure 5 A schematic block diagram of an example electronic device 500 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their modes are provided for example only and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0119] like Figure 5As shown, electronic device 500 includes a computing unit 501, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 502 or a computer program loaded from a storage unit 508 into a random access memory (RAM) 503. RAM 503 may also store various programs and data required for the operation of electronic device 500. Computing unit 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to bus 504.

[0120] Multiple components in the electronic device 500 are connected to the I / O interface 505, including: an input unit 506, such as a keyboard, a mouse, etc.; an output unit 507, such as various types of displays, speakers, etc.; a storage unit 508, such as a magnetic disk, an optical disk, etc.; and a communication unit 509, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 509 allows the electronic device 500 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0121] The computing unit 501 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the computing unit 501 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 501 performs the various methods and processes described above, such as the method for selecting a circuit breaker for a distribution system. For example, in some embodiments, the method for selecting a circuit breaker for a distribution system may be implemented as a computer software program tangibly embodied in a machine-readable medium, such as the storage unit 508. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 500 via the ROM 502 and / or the communication unit 509. When the computer program is loaded into the RAM 503 and executed by the computing unit 501, one or more steps of the method for selecting a circuit breaker for a distribution system described above may be performed. Alternatively, in other embodiments, the computing unit 501 may be configured to execute the power distribution system circuit breaker selection method in any other appropriate manner (eg, by means of firmware).

[0122] Various embodiments of the systems and techniques described above can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0123] Program code for implementing the methods of the present disclosure can be written in any combination of one or more programming languages. Such program code can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable power distribution system circuit breaker selection device, such that when executed by the processor or controller, the program code implements the modes / operations specified in the flowcharts and / or block diagrams. The program code can be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0124] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fibers, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0125] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0126] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), and the Internet.

[0127] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved. This is not limited herein.

[0128] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for selecting a circuit breaker for a power distribution system, characterized in that: The method comprises: Determine attribute data of each circuit breaker based on configuration information of each circuit breaker in the tree topology power distribution system, take each circuit breaker as a node of the tree topology structure, and traverse the nodes in the tree topology structure; In response to detecting that the current node is a non-leaf node based on the attribute data, traversing all subordinate nodes of the current node, and obtaining initial setting values ​​of all subordinate nodes and a maximum setting value among all initial setting values; Add up the initial setting values ​​of all lower-level nodes to obtain the added setting value; Determining a selected setting value based on the added setting value and a pre-calibrated current setting value table, the current setting value table being used to represent a sorted sequence of current setting values ​​for different types of circuit breakers from different manufacturers; Based on the selected setting value, the maximum setting value and a pre-calibrated complete selectivity coordination table, the actual setting value and selection identification information of the current node are determined, wherein the complete selectivity coordination table is a coordination table determined by the circuit breaker in the current setting value table and the tripping curves of each circuit breaker.

2. The method according to claim 1, characterized in that The determining of the actual setting value and selection identification information of the current node based on the selected setting value, the maximum setting value and the pre-calibrated complete selectivity coordination table includes: Based on the selected setting value, the maximum setting value and a pre-calibrated full selectivity matching table, detecting whether the selected setting value satisfies full selectivity; In response to detecting that the selected setting value satisfies full selectivity, using the selected setting value as an actual setting value of the current node; The selection identification information of the current node is determined based on the actual setting value of the current node and the tripping curve of the current node.

3. The method according to claim 2, characterized in that The detecting whether the selected setting value satisfies full selectivity based on the selected setting value, the maximum setting value, and a pre-calibrated full selectivity coordination table includes: Matching the row value of the pre-calibrated complete selection configuration table with the selected setting value to obtain a matching row value; Matching the column value of the complete selection configuration table with the maximum setting value to obtain a matching column value; Detecting whether the marked value corresponding to both the matching row value and the matching column value in the complete selection configuration table indicates complete selectivity; In response to the marked value indicating full selectivity, it is determined that the selected setting value satisfies full selectivity.

4. The method according to claim 2, characterized in that The method further comprises: In response to detecting that the selection set value does not meet full selectivity, determining a new selection set value based on the summed set value and the current set value table; Using the new selected set value as the selected set value, and continuing to test whether the selected set value satisfies full selectivity based on the selected set value, the maximum set value, and a pre-calibrated full selectivity coordination table until all current set values ​​in the current set value table have been tested; In response to all current setting values ​​in the current setting value table being detected, the current selected setting value is used as the actual setting value, and the selection identification information of the current node is determined according to the current selected setting value and the tripping curve of the current node.

5. The method according to any one of claims 1 to 4, characterized in that The method further comprises: In response to detecting that the current node is a leaf node based on the attribute data, determining a load capacity, a sample rated current, and a startup characteristic of the current node based on the attribute data of the current node; Based on the load capacity, the sample rated current and the startup characteristics, an actual setting value and selection identification information of the current node are determined.

6. The method according to any one of claims 1 to 4, characterized in that In response to detecting that the current node is a non-leaf node based on the attribute data, traversing all subordinate nodes of the current node, and obtaining initial setting values ​​of all subordinate nodes and a maximum setting value among all initial setting values ​​includes: In response to detecting that the current node is a non-leaf node based on the attribute data, traversing all subordinate nodes of the current node; In response to the lower-level node being a leaf node, obtaining an initial setting value of the lower-level node based on attribute data of the lower-level node; In response to the lower-level node being a non-leaf node, calculating an actual setting value of the lower-level node, and using the actual setting value of the lower-level node as an initial setting value of the lower-level node; After obtaining the initial setting values ​​of all lower-level nodes, the initial setting values ​​of all lower-level nodes are compared, and the largest initial setting value is taken as the maximum setting value.

7. The method according to any one of claims 1 to 4, characterized in that The determining of the selected setting value based on the added setting value and the pre-calibrated current setting value table includes: Sequentially obtain current setting values ​​from a pre-calibrated current setting value table; Detecting whether the acquired current setting value is greater than the added setting value; In response to detecting that the acquired current set value is greater than the added set value, the acquired current set value is used as the selected set value.

8. A device for selecting circuit breakers in a power distribution system, characterized in that: The device comprises: a traversal unit configured to determine attribute data of each circuit breaker based on configuration information of each circuit breaker in the tree topology power distribution system, take each circuit breaker as a node of the tree topology structure, and traverse the nodes in the tree topology structure; an acquiring unit configured to, in response to detecting that the current node is a non-leaf node based on the attribute data, traverse all subordinate nodes of the current node and acquire initial setting values ​​of all subordinate nodes and a maximum setting value among all initial setting values; The adding unit is configured to add the initial setting values ​​of all the lower-level nodes to obtain an added setting value; a setting determination unit configured to determine a selected setting value based on the added setting value and a pre-calibrated current setting value table, the current setting value table being used to represent a sorted sequence of current setting values ​​for different types of circuit breakers from different manufacturers; The identification determination unit is configured to determine the actual setting value and selection identification information of the current node based on the selected setting value, the maximum setting value and a pre-calibrated complete selectivity coordination table, wherein the complete selectivity coordination table is a coordination table determined by the circuit breaker in the current setting value table and the tripping curves of each circuit breaker.

9. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that: The computer instructions are used to enable the computer to execute the method according to any one of claims 1 to 7.

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