Power distribution system circuit breaker type selection method and device, electronic equipment and storage medium

Abstract

The invention discloses a power distribution system circuit breaker type selection method, and relates to the technical field of power distribution control, and the specific implementation scheme is as follows: determining the attribute data of each circuit breaker based on the configuration information of each circuit breaker in a tree topology power distribution system, and determining the attribute data of each circuit breaker based on the configuration information of each circuit breaker in the tree topology power distribution system. Determining attribute data of each circuit breaker, taking each circuit breaker as a node of the tree topology structure, and traversing the nodes in the tree topology structure; in response to the fact that the current node is detected to be 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 the maximum setting value in all the initial setting values; adding the initial setting values of all the subordinate nodes to obtain an added setting value; determining a selection setting value based on the addition setting value and the current setting value table; and determining an actual setting value and type selection identification information of the current node based on the selection setting value, the maximum setting value and the complete selectivity matching table.

Description

Technical Field

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

[0002] In modern industrial enterprises and civil buildings, a large number of electrical equipment are usually installed. These equipment contain a large number of low-voltage loads. For the complex working conditions of low-voltage loads, a distribution system with a two-level or three-level tree topology is generally required to distribute power and perform distribution protection. When a fault occurs in the system, the faulty equipment must be quickly and selectively removed from the system to ensure the normal operation of the non-faulty part. For a terminal distribution system mainly composed of low-voltage electrical loads, the requirement for selectivity is particularly prominent, requiring the distribution system to be able to cut off the faulty circuit without affecting the normal operation of the loads in the upper-level or adjacent circuits.

[0003] Currently, when designing a terminal low-voltage distribution system with a tree topology, usually according to the load situation, first determine the setting value of the lowest-level circuit breaker, and then deduce the setting value of the upper-level circuit breaker based on the determined setting value of the lower-level circuit breaker. At this time, the setting value of the upper-level circuit breaker is determined based on experience and lacks a clear selective coordination mechanism. Moreover, the circuit breakers at all levels determined by this setting method may result in a poor control effect of the distribution system. During a short circuit, it may cause the expansion of the fault range of the distribution system.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill 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 the existing distribution system, and provides a method for selecting a circuit breaker for a distribution system.

[0006] The first aspect of the present disclosure provides a method for selecting a circuit breaker in a distribution system. The method includes: based on the configuration information of each circuit breaker in a tree-topology distribution system, determining the attribute data of each circuit breaker, taking 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 the current node is a non-leaf node based on the attribute data, traversing all the subordinate nodes of the current node, and obtaining the initial setting values of all the subordinate nodes and the maximum setting value among all the initial setting values; adding up the initial setting values of all the subordinate nodes to obtain an added setting value; based on the added setting value and a pre-calibrated current setting value table, determining a selected setting value, where the current setting value table is used to represent the sorting sequence of the current setting values of 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, determining the actual setting value and the type selection identification information of the current node, 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.

[0007] The second aspect of the present disclosure provides a device for selecting a circuit breaker in a distribution system. The device includes: a traversing unit configured to, based on the configuration information of each circuit breaker in a tree-topology 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; an obtaining unit configured to, in response to detecting that the current node is a non-leaf node based on the attribute data, traverse all the subordinate nodes of the current node, and obtain the initial setting values of all the subordinate nodes and the maximum setting value among all the initial setting values; an adding unit configured to add up the initial setting values of all the subordinate nodes to obtain an added setting value; a setting determination unit configured to, based on the added setting value and a pre-calibrated current setting value table, determine a selected setting value, where the current setting value table is used to represent the sorting sequence of the current setting values of different types of circuit breakers from different manufacturers; an identification determination unit configured to, based on the selected setting value, the maximum setting value, and a pre-calibrated complete selectivity coordination table, determine the actual setting value and the type selection identification information of the current node, 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] The third aspect of the present disclosure provides an electronic device. The electronic device includes: at least one processor; and a memory communicatively connected to the at least one processor, where 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] The sixth aspect of the present disclosure provides a non-transitory computer-readable storage medium storing computer instructions for causing 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 disclosure are as follows: By preparing the circuit breaker current setting value table and the complete selection matching table according to the project situation, and using the control process of external input parameters to generate the actual setting value of the circuit breaker in the power distribution system, the complete selectivity of the upper and lower circuit breakers can be achieved, and it is not affected by the cable conditions of the lower-level circuit. Even if a proximal short circuit occurs within the protection range of the lower-level circuit breaker, generating the maximum possible fault current, it can still ensure that the lower-level circuit breaker operates while the upper-level circuit breaker does not operate, improving the circuit breaker selection effect in the power distribution system and enhancing the safety of the power distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a flowchart of an embodiment of the method for selecting a circuit breaker in a power distribution system according to the present disclosure; Figure 2 is a schematic structural diagram of a tree-shaped topology power distribution system in the present disclosure; Figure 3 is a flowchart of another embodiment of the method for selecting a circuit breaker in a power distribution system according to the present disclosure; Figure 4 is a schematic structural diagram of an embodiment of the device for selecting a circuit breaker in a power distribution system according to the present disclosure; Figure 5 is a block diagram of an electronic device for implementing the method for selecting a circuit breaker in a power distribution system according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "comprises" or "including" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0013] The technical solutions of the present invention are described below through specific embodiments. It should be understood that one or more steps mentioned in the present invention do not exclude the existence of other methods and steps before and after the combined steps, or other methods and steps can be inserted between these clearly mentioned steps. It should also be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. Unless otherwise specified, the numbers of the method steps are only for the purpose of identifying the method steps, rather than limiting the arrangement order of each method or the implementation scope of the present invention. The change or adjustment of their relative relationship, under the condition of no substantial technical content change, can also be regarded as the scope in which the present invention can be implemented.

[0014] There is no specific limitation on the sources of the raw materials and instruments used in the embodiments, and they can be purchased in the market or prepared according to the conventional methods well-known to those skilled in the art.

[0015] Explanation of related terms: Tree-type topology distribution system: a widely used topology in terminal distribution systems. An upper circuit breaker protects one or more branch circuits with lower circuit breakers and the busbars, ladder cables or comb-shaped busbars at the incoming end of the branch circuit breaker, and the lower circuit breakers installed on the branch protect the branch circuit of the circuit breaker; a distribution system with such topological characteristics.

[0016] Low voltage circuit breaker setting value: The threshold value for the low voltage circuit breaker to perform the breaking action. In this disclosure, the current threshold value is mainly considered. The circuit breaker tripping characteristics are determined by this value. The setting value of some circuit breakers is adjustable, providing the product of several discrete percentage values ​​less than the rated current of the circuit breaker and the rated current as the adjustable setting value; the setting value of some circuit breakers is not adjustable, that is, the setting value is the rated value of the circuit breaker.

[0017] Protection selectivity: In a power distribution system composed of multi-stage low-voltage circuit breakers, if a fault occurs somewhere in the protection range of the lower-stage circuit breaker (including lines and loads), only the circuit breaker at this stage will operate without causing the upper-stage circuit breaker to operate, that is, only the fault circuit will be cut off without affecting other normal working circuits, then the power distribution system protection is considered to be selective. Whether the power distribution system can achieve selectivity is usually related to the setting value of the circuit breaker at this stage, the setting value of the upper-stage circuit breaker, the location of the fault within the protection range of the circuit breaker at this stage, the impedance of the cable, and the impedance of the load.

[0018] 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.

[0019] Partial selectivity: It cannot meet full selectivity, but when some lower fault current faults occur (such as remote short circuit or load overload), the circuit breaker at this level is disconnected and the upper circuit breaker does not operate, thus achieving selectivity. However, when some higher fault currents occur (such as near-end short circuit), selectivity cannot be achieved.

[0020] No selectivity: All possible fault types that occur within the protection range of this level of circuit breaker cannot be selectively protected.

[0021] Circuit breaker tripping curve: reflects the breaking action characteristics of the circuit breaker in the coordinates under a certain setting value. Generally, the horizontal axis of the coordinates is the current value and the vertical axis is the time value. In this way, the tripping curve reflects the relationship between the fault current and the action time of the circuit breaker.

[0022] When designing a terminal low-voltage distribution system with a tree topology in the prior art, usually according to the load conditions, first determine the setting value of the lowest-level circuit breaker, and then reverse-calculate the setting value of the upper-level circuit breaker based on the determined setting value of the lower-level circuit breaker. Usually, the upper-level circuit breaker adopts a setting method with a current setting value at least one level larger than that of the lower-level circuit breaker; or adjust the current setting value according to the designer's experience; or add an operating time limit setting value to the upper-level circuit breaker.

[0023] In specific engineering practices, there are various specific difficulties in achieving complete selectivity in a multi-level tree-topology distribution system, including but not limited to the following situations: During the design process of the distribution system, the input data may not be complete. For example, information such as the actual specifications and lengths of the cables in each circuit may cause the setting of the circuit breaker in that circuit to be too small or too large. The load change caused by the change in the selection of process equipment leads to a change in the expected fault current in the original circuit; the change in the grouping of process equipment leads to a change in the system topology, etc. These situations will make it difficult for the upper-level circuit breaker to find the most suitable setting value.

[0024] If the setting value of the upper-level circuit breaker is selected too large, it will increase the cost of the busbars, cables or comb-shaped busbars between the upper and lower levels.

[0025] If the setting value of the upper-level circuit breaker is too small, when a proximal short-circuit fault occurs in the lower level and the fault current is large, it may cause the lower-level circuit breaker and the upper-level circuit breaker to operate simultaneously, that is, only partial selectivity is available. Or even when a distal short circuit or load overload occurs, the lower-level and upper-level circuit breakers operate simultaneously, that is, there is no selectivity.

[0026] If, in a low-voltage distribution system composed of multi-level circuit breakers, in order to ensure complete selectivity, an operating time limit is added to the upper-level circuit breaker, then as the number of levels of the distribution system increases, once the lower-level circuit breaker fails to break reliably, it will greatly increase the existence time of the fault current in the circuit, reduce the protection of the load and the line, and may cause the protection of the medium-voltage side of the distribution transformer to operate due to the too long operating time limit of the top-level circuit breaker in the multi-level low-voltage system, expanding the scope of the system fault.

[0027] In view of the defects in the prior art, the present disclosure provides a method for selecting a circuit breaker for a distribution system. Figure 1 The flowchart 100 of an embodiment of the method for selecting a circuit breaker for a distribution system is shown. The above method for selecting a circuit breaker for a distribution system includes the following steps: Step 101, based on the configuration information of each circuit breaker in the tree-topology 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.

[0028] In this embodiment, the tree - type topology power distribution system is a power distribution system with a hierarchical structure to be designed. In the tree - type topology power distribution system, the top is the root node (such as the power supply end), which extends downward with multiple levels of sub - branches. Each branch can be further connected to sub - nodes (loads or devices). No closed loops are formed between levels, and the data transmission path is unidirectional or bidirectional.

[0029] In this embodiment, the tree - type topology power distribution system can be a subsystem obtained by improving a non - tree - type topology power distribution system. For example, in a non - tree - type topology power distribution system, there is a part of the subsystem that is a tree - type topology structure from a certain node to all its lower - level nodes until the leaf sub - nodes, and this part of the subsystem can be directly extracted as the tree - type topology power distribution system.

[0030] In this embodiment, the tree - type topology power distribution system includes multiple circuit breakers, and each circuit breaker needs to be selected. To achieve complete selectivity for all circuit breakers in the tree - type topology power distribution system, all circuit breakers need to be selected so that the circuit breakers selected with corresponding actual setting values and selection identification information can meet complete selectivity.

[0031] As Figure 2 shown, it is a schematic structural diagram of a tree - type topology power distribution system. This figure is a single - line system diagram. The lines in the figure only show the upper - lower logic relationship of the components and do not represent the actual number of cable phases. Component 0 is a power transformer, which can be understood as the system power supply. The power distribution system includes circuit breakers No. 1 to No. 7, the power supply circuits between them, and the loads under each circuit breaker. Circuit breaker No. 1 is the root - node circuit breaker in the tree - type topology structure, and circuit breakers No. 2, 3, 5, 6, and 7 are the leaf - node circuit breakers in the tree - type topology structure. Circuit breaker No. 1 is the upper - level node (parent node) of circuit breakers No. 2, 3, and 4; circuit breaker No. 4 is the upper - level node of circuit breakers No. 5, 6, and 7. Circuit breakers No. 2, 3, and 4 are the lower - level nodes (sub - nodes) of circuit breaker No. 1; circuit breakers No. 5, 6, and 7 are the lower - level nodes (sub - nodes) of circuit breaker No. 4.

[0032] In Figure 2 , if a short - circuit occurs in the line at the lower port of circuit breaker No. 6, the short - circuit current will flow from the power transformer (component 0) through circuit breaker No. 1, the line between circuit breaker No. 1 and circuit breaker No. 4, circuit breaker No. 4, the line between circuit breaker No. 4 and circuit breaker No. 6, and circuit breaker No. 6. If circuit breaker No. 6 operates while other circuit breakers do not operate when this short - circuit fault occurs, it is considered that the protection has selectivity. If circuit breaker No. 6 operates when this short - circuit fault occurs, and any one of circuit breakers No. 4 and No. 1 operates or both circuit breakers No. 4 and No. 1 operate, it is considered that the protection does not have selectivity.

[0033] In this embodiment, the configuration information of the circuit breaker is the setting information of the circuit breaker obtained before selecting the type of the circuit breaker. The configuration information includes: the number of the circuit breaker, the number of child nodes included in the node corresponding to the circuit breaker in the tree-shaped topology power distribution system, which branch of the superior node the node corresponding to the circuit breaker in the tree-shaped topology power distribution system is, the parent node number of the node corresponding to the circuit breaker in the tree-shaped topology power distribution system, etc. Through the configuration information, the positional relationship of each circuit breaker in the tree-shaped topology power distribution system can be determined. The attribute data is used to reflect the attributes of each circuit breaker in the tree-shaped topology power distribution system. For example, the attribute data includes: whether it belongs to a leaf node, whether it belongs to a non-leaf node. When it belongs to a non-leaf node, the sub-attribute data of its child nodes below. The above-mentioned determination of the attribute data based on the configuration information includes: in response to the child node included in the current circuit breaker not being a circuit breaker, determining that the current circuit breaker belongs to a leaf node in the attribute topology structure formed by the circuit breakers.

[0034] In this embodiment, the tree-shaped topology structure is a new topology structure formed by extracting all the circuit breakers in the tree-shaped topology power distribution system and using these all circuit breakers as nodes. When traversing the nodes in the tree-shaped topology structure, the traversal can be carried out in a certain order, such as starting from the leaf nodes of the tree-shaped topology structure.

[0035] Step 102, in response to detecting that the current node is a non-leaf node based on the attribute data, traverse all the lower-level nodes of the current node, and obtain the initial setting values of all the lower-level nodes and the maximum setting value among all the initial setting values.

[0036] In this embodiment, a non-leaf node refers to a node having child nodes in the lower layer in the tree-shaped topology structure. When there is only one child node in the lower layer of the non-leaf node in the tree-shaped topology structure and the child node 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-shaped topology power distribution system, and this initial setting value is used as the maximum setting value.

[0037] In this embodiment, when there are multiple layers of child nodes below the non-leaf node in the tree-shaped topology structure, start from the child nodes of the adjacent leaf nodes and adopt the circuit breaker type selection method for the power distribution system of the present disclosure to obtain the actual setting values of each child node, and select the maximum value from the actual setting values of all the child nodes as the maximum setting value.

[0038] Step 103, add up the initial setting values of all the lower-level nodes to obtain the added setting value.

[0039] In this embodiment, when there is only one value among the initial setting values of all the lower-level nodes, directly add this value to zero, or directly use this initial setting value as the added setting value.

[0040] In this embodiment, when there are multiple initial setting values for all lower-level nodes, the multiple values are summed to obtain the added setting value.

[0041] Step 104: Based on the added setting value and a pre-calibrated current setting value table, determine the selected setting value.

[0042] In this embodiment, the current setting value table is used to represent the sorting sequence of the current setting values of 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 selectivity coordination table.

[0043] In this embodiment, in this alternative implementation, the above current setting value table is calibrated through the following steps: Determine the models and manufacturers of all circuit breakers in the power distribution system; Arrange all circuit breakers in the order of the magnitude of the current setting values of each circuit breaker among all circuit breakers; In response to circuit breakers with the same current setting value among all circuit breakers, arrange the current setting values of such circuit breakers according to the cost of the circuit breaker.

[0044] Specifically, all possible low-voltage circuit breaker models applicable to the power distribution system can be listed and arranged in ascending order of the setting value. If there are circuit breakers of different types with the same setting value, they are arranged in ascending order of their cost, denoted as numbered from 1 to n, where the number represents the circuit breaker model of different manufacturers, and the corresponding current setting values are denoted as I[1] to I[n], where n > 1. As shown in Table 1.

[0045] Table 1

[0046] In this embodiment, the above step 104 includes: Compare the added setting value with the current setting values in the current setting value table one by one. In response to detecting that the added setting value is greater than the current setting values in the current setting value table, it is determined that the current node does not meet full selectivity, and the actual setting value of the current node is determined according to the maximum partial selectivity. At this time, the selected setting value is equal to the last current setting value in the current setting value table.

[0047] Step 105: Based on the selected setting value, the maximum setting value, and a pre-calibrated full selectivity coordination table, determine the actual setting value and the selection identification information of the current node.

[0048] In this embodiment, the full selectivity coordination table is a coordination table determined through 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 represent whether multiple circuit breakers meet full selectivity, and the circuit breakers that meet full selectivity can be determined through the full selectivity coordination table.

[0049] In this embodiment, the calibration process of the complete selectivity coordination table is as follows: the row number is recorded as the lower circuit breaker, recorded as D[1] to D[n], and the column number is recorded as the upper circuit breaker, recorded as U[1] to U[n], and a complete selectivity coordination table is compiled. The complete selectivity coordination table is a table with n rows and n columns of data, as shown in Table 2 below: Table 2

[0050] Since the upper circuit breaker should be at least larger than the lower circuit breaker, the lower left part of the table is invalid data and is recorded as "Null". The upper right part of the table is compiled according to the coordination table or tripping curve of the tripper provided by the circuit breaker sample.

[0051] In this embodiment, the circuit breaker has a time-current characteristic. Generally, the tripping curve of the circuit breaker has a coordinate axis with the horizontal axis being 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 is 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 left-down curve 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 corresponding curve of the lower-level circuit breaker moving up. If the curves of the two circuit breakers still have no intersection after the upward movement, it can be considered that the two circuit breakers have full selectivity.

[0052] Whether the lower circuit breaker can form complete selectivity with the upper circuit breaker can be determined according to three situations in the product data: ① The setting value of a certain type of circuit breaker indicates at least how much setting value it has to have complete selectivity compared to circuit breakers of the same type.

[0053] ② A certain type of circuit breaker does not indicate at what setting value it has to have full selectivity with the same type of circuit breakers under 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 there is no intersection between the upper and lower circuit breaker tripping curves, 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.

[0054] ③ For two circuit breakers of different types, the product tripping curves are plotted in the same tripping curve coordinates. The lower circuit breaker increases the tripping curve offset according to the total action time. If the two tripping curves of the circuit breaker have no intersection, it has complete selectivity; otherwise, if there is an intersection, it is considered that the complete selectivity requirement is not met.

[0055] 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".

[0056] It should be noted that the coordination table provided in the circuit breaker sample is also the selective coordination table for two types of circuit breakers. The row number represents the upstream circuit breaker, and the column number represents the downstream circuit breaker. For example, the annotation "T" in the table indicates that the upstream and downstream circuit breakers have complete selectivity. The numbers in the table indicate that the upstream and downstream circuit breakers only have partial selectivity. The number represents that the short-circuit current passing through the upstream and downstream circuit breakers is less than this value, and the upstream and downstream circuit breakers have selectivity. The blank cells in the table represent that there is no selectivity between the corresponding upstream and downstream circuit breakers.

[0057] The content of the complete selectivity coordination table of the present disclosure can be similar to the coordination table provided in the circuit breaker sample, but only includes complete selectivity, that is, the information containing "T" in the coordination table provided in the corresponding circuit breaker sample is filled with 1 in the complete selectivity coordination table of the present disclosure. Other cases with only partial selectivity or no selectivity are filled with 0 in the complete selectivity coordination table of the present disclosure.

[0058] In this embodiment, the actual setting value is the optimal or complete selectivity-satisfying current setting value determined for the circuit breaker corresponding to the current node in the tree topology.

[0059] In this embodiment, the above step 105 includes: matching the selected setting value and the maximum setting value with the current setting values in the complete selectivity matching table respectively. In response to both matches being successful, detecting whether the selected setting value and the maximum setting value satisfy complete selectivity in the complete selectivity matching table. In response to detecting that the selected setting value and the maximum setting value satisfy complete selectivity, taking the selected setting value as the actual setting value of the current node, and taking the manufacturer and circuit breaker model of the upstream circuit breaker corresponding to the selected setting value and the maximum setting value as the selection identification information.

[0060] The circuit breaker selection method provided by the present disclosure. First, based on the configuration information of each circuit breaker in a tree-topology power distribution system, determine the attribute data of each circuit breaker, use each circuit breaker as a node of the tree-topology structure, and traverse the nodes in the tree-topology structure. Second, in response to detecting that the current node is a non-leaf node based on the attribute data, traverse all the subordinate nodes of the current node, and obtain the initial setting values of all the subordinate nodes and the maximum setting value among all the initial setting values. Third, add up the initial setting values of all the subordinate nodes to obtain the added setting value. Fourth, based on the added setting value and a pre-calibrated current setting value table, determine the selected setting value. The current setting value table is used to represent the sorting sequence of the current setting values of different types of circuit breakers from different manufacturers. Finally, based on the selected setting value, the maximum setting value, and a pre-calibrated complete selectivity coordination table, determine the actual setting value and the selection identification information of the current node. The complete selectivity coordination table is a coordination table determined through the circuit breakers in the current setting value table and the tripping curves of each circuit breaker. After preparing the circuit breaker current setting value table and the complete selection coordination table according to the project situation, using the control flow of the externally input parameters to generate the actual setting value of the circuit breaker in the power distribution system can enable the upper and lower circuit breakers to achieve complete selectivity and is not affected by the situation of the lower circuit cable. Even if a proximal short circuit occurs within the protection range of the lower circuit breaker, generating the maximum possible fault current, it can still ensure that the lower circuit breaker operates while the upper circuit breaker does not operate, improving the circuit breaker selection effect in the power distribution system and enhancing the safety of the power distribution system.

[0061] In some embodiments of the present disclosure, the above-mentioned determining the actual setting value and the 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 includes: based on the selected setting value, the maximum setting value, and a pre-calibrated complete selectivity coordination table, detecting whether the selected setting value meets complete selectivity; in response to detecting that the selected setting value meets complete selectivity, use the selected setting value as the actual setting value of the current node; according to the actual setting value of the current node and the tripping curve of the current node, determine the selection identification information of the current node.

[0062] In this alternative implementation, the complete selectivity coordination table records information on whether two setting values conform to complete selectivity. After obtaining the selected setting value and the maximum setting value, match the selected setting value and the maximum setting value with the setting values in the complete selectivity coordination table respectively. When both the selected setting value and the maximum setting value match the setting values in the complete selectivity coordination table, detect whether the selected setting value and the maximum setting value meet complete selectivity through the complete selectivity of these two setting values in the complete selectivity coordination table.

[0063] In this alternative implementation, the selection identification information is the selection information of the circuit breaker. The selection identification information includes information such as the manufacturer and model of the circuit breaker corresponding to the current node. After determining the actual setting value and the tripping curve, by matching the two with the circuit breaker information of different manufacturers, the selection identification information of the current node can be obtained.

[0064] The method provided by the present disclosure for determining the actual setting value and the 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, detects whether the selected setting value meets complete selectivity; in response to detecting that the selected setting value meets complete selectivity, takes the selected setting value as the actual setting value of the current node; and determines 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, providing a reliable implementation for obtaining the actual setting value and the selection identification information.

[0065] In some alternative implementations of the present disclosure, the detecting whether the selected setting value meets complete selectivity based on the selected setting value, the maximum setting value, and a pre-calibrated complete selectivity coordination table includes: matching the row values of the pre-calibrated complete selection configuration table with the selected setting value to obtain the matching row values; matching the column values of the complete selection configuration table with the maximum setting value to obtain the matching column values; detecting whether the marked value corresponding to the matching row values and the matching column values in the complete selection configuration table represents complete selectivity; and in response to the marked value representing complete selectivity, determining that the selected setting value meets complete selectivity.

[0066] In this alternative implementation, to determine whether the selected setting value of the current node and the maximum setting value of the child node can form complete selectivity according to the information in the circuit breaker complete selectivity coordination table (such as the table shown in Table 2), the following method is used: substitute the selected 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, and query the data in the corresponding row and column in the table. If it is 1, it meets complete selectivity; if it is not 1, it does not meet complete selectivity.

[0067] The method provided by this alternative implementation for detecting whether the selected setting value meets complete selectivity matches the row values of the pre-calibrated complete selection configuration table with the selected setting value to obtain the matching row values; matches the column values of the complete selection configuration table with the maximum setting value to obtain the matching column values; detects whether the marked value corresponding to the matching row values and the matching column values in the complete selection configuration table represents complete selectivity; and in response to the marked value representing complete selectivity, determines that the selected setting value meets complete selectivity, providing a reliable implementation for the detection of complete selectivity.

[0068] In some embodiments of the present disclosure, the above method further 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 the pre-calibrated full selectivity coordination table until all the current setting values in the current setting value table have been detected; in response to all the 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 model selection identification information of the current node according to the current selected setting value and the tripping curve of the current node.

[0069] Figure 3 Fig. 300 shows the flow of another embodiment of the method for selecting a circuit breaker in a distribution system. The above method for selecting a circuit breaker in a distribution system includes the following steps: Step 301, based on the configuration information of each circuit breaker in the tree-shaped topology distribution system, determining the attribute data of each circuit breaker, taking each circuit breaker as a node of the tree-shaped topology structure, and traversing the nodes in the tree-shaped topology structure. After that, step 302 is executed.

[0070] Step 302, in response to detecting that the current node is a non-leaf node based on the attribute data, traversing all the subordinate nodes of the current node, and obtaining the initial setting values of all the subordinate nodes and the maximum value among all the initial setting values. After that, step 303 is executed.

[0071] Step 303, adding up the initial setting values of all the subordinate nodes to obtain the added setting value. After that, step 304 is executed.

[0072] Step 304, determining the selected setting value based on the added setting value and the pre-calibrated current setting value table. After that, step 305 is executed.

[0073] In this embodiment, the current setting value table is used to represent the sorting sequence of the current setting values of different types of circuit breakers from different manufacturers.

[0074] Step 305, detecting whether the selected setting value meets the full selectivity based on the selected setting value, the maximum setting value, and the pre-calibrated full selectivity coordination table; if it meets the full selectivity, step 306 is executed; if it does not meet the full selectivity, step 309 is executed.

[0075] Step 306, using the selected setting value as the actual setting value of the current node. After that, step 307 is executed.

[0076] Step 307, determining the model 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. After that, step 308 is executed.

[0077] Step 308, end.

[0078] Step 309, check whether all current setting values in the current setting value table have been detected; if not, execute Step 310, if so, execute Step 311.

[0079] In this embodiment, select a selected setting value in the current setting value table whose current value is greater than or equal to the added setting value. Compare this selected setting value with the maximum setting value among the lower-level nodes of the current node, and query the complete selectivity coordination table of the circuit breaker. If complete selectivity can be satisfied, use this value as the actual current setting value of the current node. If not, select a larger-level setting value and continue to compare until complete selectivity is satisfied or maximum partial selectivity is satisfied when complete selectivity cannot be satisfied. Finally, return the actual setting value of the current node.

[0080] Step 310, based on the added setting value and the current setting value table, determine a new selected setting value, and use the new selected setting value as the selected setting value. After that, execute Step 305.

[0081] In this embodiment, traverse all lower-level nodes, obtain the actual setting values of the lower-level nodes, and then add up the actual setting values of the lower-level nodes to obtain the added setting value of the current node.

[0082] In this embodiment, compare the added setting value with the current setting values in the current setting value table, that is, select a current setting value from the current setting value table as the new selected setting value.

[0083] Step 311, use the current selected setting value as the actual setting value, and determine the selected type identification information of the current node according to the current selected setting value and the tripping curve of the current node, and execute Step 308.

[0084] In this embodiment, when it is proved that all current setting values in the current setting value table have been detected, it means that even if the maximum current value in the circuit breaker current setting value table (Table 1) is selected as the selected setting value of the current node, complete selectivity cannot be satisfied. Then, use the selected setting value corresponding to the existing I[z] (at this time I[z] is equal to I[n]) as the final actual setting value of the current node. Although the result cannot meet the requirements of complete selectivity, it can achieve the 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 complete selectivity, but it can guarantee maximum partial selectivity.

[0085] 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-shaped busbars between the upper and lower levels. Minimizing the upper-level circuit breaker can effectively reduce the cost of the busbars, cables or comb-shaped busbars between each level.

[0086] The distribution system circuit breaker selection method provided by the present embodiment detects that the selection setting value does not meet the full selectivity, and determines a new selection setting value based on the addition setting value and the current setting value table; uses the new selection setting value as the selection setting value, and continues to detect whether the selection setting value meets the full selectivity based on the selection setting value, the maximum setting value and the pre-calibrated full selectivity coordination table, until all the current setting values ​​in the current setting value table are detected, thereby improving the reliability of the selection of the selection setting value.

[0087] 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.

[0088] 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; taking 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 according to the actual setting value and the tripping curve type of the current node.

[0089] In this embodiment, the setting value of the circuit breaker of the lowest level circuit of the 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 rated current of the load, meeting the requirements of the rated capacity of the load, and selecting the appropriate type of tripping curve 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 in 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.

[0090] In some alternative implementations of the present disclosure, the above-mentioned process of 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 the initial setting values in response to detecting that the current node is a non-leaf node based on attribute data includes: 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 a 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 a 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.

[0091] The method for obtaining the initial setting value and the maximum setting value provided by this alternative implementation gives the obtaining processes of the initial setting value and the maximum setting value respectively for the cases where the subordinate node is a leaf node or a non-leaf node, improving the comprehensiveness and reliability of obtaining the initial setting value and the maximum setting value.

[0092] In some alternative implementations of the present disclosure, the above-mentioned process of determining the selected setting value based on the added setting value and the pre-calibrated current setting value table includes: sequentially obtaining the current setting values of the pre-calibrated current setting value table; detecting 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, using the obtained current setting value as the selected setting value.

[0093] The method for determining the selected setting value provided by this alternative implementation sequentially obtains the current setting values of the pre-calibrated current setting value table; detects 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, uses the obtained current setting value as the selected setting value, improving the reliability of obtaining the selected setting value.

[0094] Optionally, in response to detecting that the obtained current setting value is less than the added setting value, continue to obtain a new current setting value from the current setting value table in the current order.

[0095] Further referring to Figure 4 , as an implementation of the methods shown in the above figures, the present disclosure provides an embodiment of a device for selecting a circuit breaker in a power distribution system. This device embodiment corresponds to Figure 1 the method embodiment shown, and this device can be specifically applied to various electronic devices.

[0096] As shown in Figure 4As shown in the figure, the breaker selection device 400 for a power distribution system 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. Among them, the traversal unit 401 can be configured to determine the attribute data of each breaker based on the configuration information of each breaker in the tree-topology power distribution system, use each 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 the subordinate nodes of the current node, and acquire the initial setting values of all the subordinate nodes and the maximum initial setting value among all the initial setting values. The addition unit 403 can be configured to add up the initial setting values of all the subordinate nodes to obtain an added setting value. The setting determination unit 404 can be configured to determine a 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 represent the sorting sequence of the current setting values of different types of breakers from different manufacturers. The identification determination unit 405 is configured to determine the actual setting value and the selection identification information of the current node based on the selected setting value, the maximum setting value, and a pre-calibrated full selectivity coordination table, where the full selectivity coordination table is a coordination table determined through the breakers in the current setting value table and the tripping curves of each breaker.

[0097] In this embodiment, in the breaker selection device 400 for a power distribution system: the specific processing of the traversal unit 401, the acquisition unit 402, the addition unit 403, the setting determination unit 404, and the identification determination unit 405 and the technical effects brought thereby can respectively refer to Figure 1 the relevant descriptions of steps 101, 102, 103, 104, and 105 in the corresponding embodiment, which will not be elaborated here.

[0098] In an embodiment of the present disclosure, the identification determination unit 405 is configured to: detect whether the selected setting value meets 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 meets 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 according to the actual setting value of the current node and the tripping curve of the current node.

[0099] In an embodiment of the present disclosure, the identification determination unit 405 is configured to: match the row value of the pre-calibrated full selection configuration table with the selected setting value to obtain a matching row value; match the column value of the full 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 full selection configuration table represents having full selectivity; and in response to the marked value representing having full selectivity, determine that the selected setting value meets full selectivity.

[0100] In one embodiment of the present disclosure, the above-mentioned circuit breaker selection device 400 for the power distribution system further includes: a detection unit (not shown in the figure), and the detection unit is configured to: in response to detecting that the selected setting value does not satisfy complete selectivity, based on the added setting value and the current setting value table, determine a new selected setting value; use the new selected setting value as the selected setting value, and continue to detect whether the selected setting value satisfies complete selectivity based on the selected setting value, the maximum setting value, and the pre-calibrated complete selectivity coordination table until all the current setting values in the current setting value table have been detected; in response to all the current setting values in the current setting value table having been detected, use the current selected setting value as the actual setting value, and determine the selection identification information of the current node according to the current selected setting value and the tripping curve of the current node.

[0101] In one embodiment of the present disclosure, the above-mentioned circuit breaker selection device 400 for the power distribution system further includes: a leaf setting unit (not shown in the figure), and the leaf setting unit is configured to: in response to detecting that the current node is a leaf node based on the attribute data, determine the load capacity, sample rated current, and starting characteristics of the current node based on the attribute data of the current node; determine the actual setting value and the selection identification information of the current node based on the load capacity, sample rated current, and starting characteristics.

[0102] In one embodiment of the present disclosure, the above-mentioned acquisition unit 402 is further configured to: in response to detecting that the current node is a non-leaf node based on the attribute data, traverse all the lower-level nodes of the current node; in response to the lower-level node being a leaf node, obtain the initial setting value of the lower-level node based on the attribute data of the lower-level node; in response to the lower-level node being a non-leaf node, calculate the actual setting value of the lower-level node, and use the actual setting value of the lower-level node as the initial setting value of the lower-level node; after obtaining the initial setting values of all the lower-level nodes, compare the initial setting values of all the lower-level nodes, and use the largest initial setting value as the maximum setting value.

[0103] In one embodiment of the present disclosure, the above-mentioned addition unit 403 is further configured to: sequentially obtain the current setting values of the 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.

[0104] In the circuit breaker selection device for a power distribution system provided in the embodiments of the present disclosure, first, a traversal unit 401 determines the attribute data of each circuit breaker based on the configuration information of each circuit breaker in a tree-shaped topology power distribution system, takes each circuit breaker as a node of the tree-shaped topology structure, and traverses the nodes in the tree-shaped topology structure; second, an acquisition unit 402, in response to detecting that the current node is a non-leaf node based on the attribute data, traverses all the lower-level nodes of the current node, and acquires the initial setting values of all the lower-level nodes and the maximum setting value among all the initial setting values; third, an addition unit 403 adds up the initial setting values of all the lower-level nodes to obtain an added setting value; fourth, a setting determination unit 404 determines a 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 represent the sorting sequence of the current setting values of different types of circuit breakers from different manufacturers; finally, an identification determination unit 405 determines the actual setting value and the selection identification information of the current node based on the selected setting value, the maximum setting value, and a pre-calibrated full selectivity coordination table. 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. By preparing the circuit breaker current setting value table and the full selection coordination table according to the project situation and generating the actual setting value of the circuit breaker in the power distribution system using the control flow of external input parameters, the upper and lower circuit breakers can achieve full selectivity and are not affected by the situation of the lower-level loop cables. Even if a proximal short circuit occurs within the protection range of the lower-level circuit breaker, generating the maximum possible fault current, it is still possible to ensure that the lower-level circuit breaker operates while the upper-level circuit breaker does not operate, improving the circuit breaker selection effect in the power distribution system and enhancing the safety of the power distribution system.

[0105] 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.

[0106] Figure 5 FIG. shows a schematic block diagram of an exemplary electronic device 500 that can be used to implement the embodiments of the present disclosure. The electronic device is intended to represent various forms of digital computers, such as, for example, a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, for example, a personal digital processor, a cellular phone, a smartphone, a wearable device, and other similar computing devices. The components shown herein, their connections and relationships, and their modes are merely examples and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0107] As Figure 5As shown, the 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. In the RAM 503, various programs and data required for the operation of the electronic device 500 can also be stored. The computing unit 501, the ROM 502, and the RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0108] 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 disc, 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.

[0109] The computing unit 501 can be various general-purpose and / or special-purpose processing components 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 dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 501 executes the various methods and processes described above, such as the method for selecting a circuit breaker for a power distribution system. For example, in some embodiments, the method for selecting a circuit breaker for a power distribution system can be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as the storage unit 508. In some embodiments, part or all of the computer program can be loaded and / or installed onto 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 power distribution system described above can be executed. Alternatively, in other embodiments, the computing unit 501 can be configured to execute the method for selecting a circuit breaker for a power distribution system in any other appropriate way (e.g., by means of firmware).

[0110] The various embodiments of the systems and techniques described above in this specification can be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on a chip (SOCs), complex 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 interpretable on a programmable system including at least one programmable processor, which can be a special-purpose or general-purpose programmable processor that receives data and instructions from, and transmits data and instructions to, a storage system, at least one input device, and at least one output device.

[0111] The program code for implementing the methods of the present disclosure can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable circuit breaker selection device, such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The program code can be executed entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine, or entirely on the remote machine or server.

[0112] In the context of this disclosure, a machine-readable medium can be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0113] To provide for interaction with a user, the systems and techniques described here 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 a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the computer. Other kinds of devices can also be used to provide for interaction with the user; for example, 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).

[0114] The systems and techniques described here can be implemented in a computing system including backend components (e.g., as a data server), or a computing system including middleware components (e.g., an application server), or a computing system including frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described here), or a computing system including any combination of such backend components, middleware components, or frontend 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.

[0115] It should be understood that the various forms of the processes shown above can be used, steps can be reordered, added, or deleted. For example, the steps recited in this disclosure can be executed 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. No limitation is imposed herein.

[0116] The foregoing description of specific exemplary embodiments of the invention has been presented for purposes of illustration and example. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that, according to the above teachings, many modifications and variations are possible. The purpose of selecting and describing the exemplary embodiments is to explain the particular principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize the various different exemplary embodiments of the invention, as well as various different selections 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 includes: Based on the configuration information of each circuit breaker in the tree - type topology distribution system, determine the attribute data of each circuit breaker, take each circuit breaker as a node of the tree - type topology structure, and traverse the nodes in the tree - type topology structure; In response to detecting that the current node is a non - leaf node based on the attribute data, traverse all the subordinate nodes of the current node, and obtain the initial setting values of all the subordinate nodes and the maximum setting value among all the initial setting values; Add up the initial setting values of all the subordinate nodes to obtain the added setting value; Based on the added setting value and a pre - calibrated current setting value table, determine the selected setting value. The current setting value table is used to represent the sorting sequence of the current setting values of 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, determine the actual setting value and the selection identification information of the current node. 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.

2. The method according to claim 1, characterized in that, The determining the actual setting value and the 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 includes: Based on the selected setting value, the maximum setting value, and a pre - calibrated complete selectivity coordination table, detect whether the selected setting value meets complete selectivity; In response to detecting that the selected setting value meets complete selectivity, take the selected setting value as the actual setting value of the current node; According to the actual setting value of the current node and the tripping curve of the current node, determine the selection identification information of the current node.

3. The method according to claim 2, wherein The detecting whether the selected setting value meets complete selectivity based on the selected setting value, the maximum setting value, and a pre - calibrated complete selectivity coordination table includes: Match the row value of the pre - calibrated complete selection configuration table with the selected setting value to obtain the matching row value; Match the column value of the complete selection configuration table with the maximum setting value to obtain the 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 selected setting value meets complete selectivity.

4. The method according to claim 2, wherein The method further includes: In response to detecting that the selected setting value does not meet complete selectivity, based on the added setting value and the current setting value table, determine a new selected setting value; Take the new selected setting value as the selected setting value, and continue to detect whether the selected setting value meets complete selectivity based on the selected setting value, the maximum setting value, and a pre - calibrated complete selectivity coordination table until all the current setting values in the current setting value table have been detected; In response to all the current setting values in the current setting value table having been detected, take the current selected setting value as the actual setting value, and according to the current selected setting value and the tripping curve of the current node, determine the selection identification information of the current node.

5. The method according to any one of claims 1-4, characterized in that, The method further includes: In response to detecting that the current node is a leaf node based on the attribute data, determine 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, the sample rated current, and the starting characteristics, determine the actual setting value and the selection identification information of the current node.

6. The method according to any one of claims 1-4, characterized in that, The steps for, 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 the initial setting values of all subordinate nodes and the maximum setting value among all the initial setting values include: 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; 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.

7. The method according to any one of claims 1 to 4, characterized in that, The steps for determining the selected setting value based on the added setting value and a pre-calibrated current setting value table include: Sequentially obtain the current setting values in the 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.

8. A circuit breaker selection device for a power distribution system, characterized in that, The device includes: A traversing unit configured to determine the attribute data of each circuit breaker based on the configuration information of each circuit breaker in a tree-topology distribution system, use each circuit breaker as a node of the tree-topology structure, and traverse the nodes in the tree-topology structure; An obtaining 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 obtain the initial setting values of all subordinate nodes and the maximum setting value among all the initial setting values; An adding unit configured to add the initial setting values of all subordinate nodes to obtain an added setting value; A setting determination unit 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 represent the sorting sequence of the current setting values of different types of circuit breakers from different manufacturers; An identification determination unit configured to determine the actual setting value and the 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.

9. An electronic device, characterized in that, It includes: 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 so that the at least one processor can execute the method according to any one of claims 1-7.

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

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