Main transformer low-voltage side multi-branch loop modeling application method

Abstract

The invention provides a main transformer low-voltage side multi-branch loop modeling application method, which comprises the following steps of: S101, importing an SCD (Substation Configuration Description) file, and analyzing IED (Intelligent Electronic Device) information in the SCD file; s102, IED information is extracted, and low-voltage side interval equipment is divided from the IED information; s103, dividing the low-voltage side interval equipment into different interval regions; s104, carrying out pairing on the IED equipment in each spacer region; s105, importing a power system plant station model file, and analyzing a topological structure of a power system plant station; s106, associating main transformer branch attributes according to the pairing relation of the spacer equipment in the step S104, and outputting a final plant station physical model file with the main transformer branch attributes; and S107, analyzing the final plant station physical model file through a visualization generation tool to obtain a corresponding visualization view. According to the method, the secondary loop view of the main transformer branch equipment can be quickly and accurately found, the searching steps are reduced, unwanted loop views are eliminated, and the working efficiency of users is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary circuit modeling of intelligent substations, and in particular to an application method for modeling a multi-branch circuit on a low-voltage side of a main transformer. Background Art

[0002] At present, my country is vigorously developing power construction and reducing the consumption of non-renewable resources. As the core part of power construction, substations are also gradually upgraded. In the past, the traditional design method of substations mainly output non-structured documents such as CAD drawings, which could not be effectively output into digital models, resulting in problems such as difficulty in intelligent acceptance and later operation and maintenance. With the increasingly obvious trend of digital design and construction and intelligent upgrading of substations, my country's power grid has also made great progress in the direction of informatization, digitization and intelligence.

[0003] The technology of substation drawing visualization has become mature. The secondary circuit diagram generated by the visualization tool currently only supports filtering by the cabinet number. The filtered secondary circuit diagram involves many devices and circuits, and it is impossible to quickly locate the required drawings. It is necessary to manually find the required drawings according to the cabinet number on the opposite side, which is inefficient. More specifically, as a cross-voltage interval object, the main transformer has much more complex drawings and circuit information than other non-cross-voltage interval objects. In particular, when there are multiple branches on the low-voltage side of the main transformer, the circuit coordination relationship between the multi-branch interval and the main transformer interval, and between the segmented interval corresponding to the multi-branch interval and the main transformer interval is complex. The conventional way of reading drawings and model circuit visualization lack the support of the model system, and the information presentation is not intuitive enough. The real circuit and virtual circuit designs issued by some design units are also prone to errors in the coordination of different branches. Therefore, it is urgent to propose a targeted multi-branch circuit modeling method based on standardized IED naming to address the problems of complex multi-branch circuits on the low-voltage side of the main transformer and the unintuitive information presentation, so as to realize the modeling and application of multi-branch circuits on the low-voltage side of the main transformer. Summary of the invention

[0004] The purpose of the present invention is to provide an application method for modeling multi-branch circuits on the low-voltage side of a main transformer, so as to solve the current problems of complex multi-branch circuits on the low-voltage side of the main transformer and non-intuitive information presentation, and to realize modeling and application of multi-branch circuits on the low-voltage side of the main transformer.

[0005] To achieve the above-mentioned object of the invention, the present invention provides a method for modeling and applying a multi-branch circuit on the low-voltage side of a main transformer, the method comprising: S101, import the SCD file and parse the IED information in the SCD file; S102, extracting IED information and dividing low-voltage side compartment equipment therefrom; S103, dividing the low-voltage side interval equipment into different interval areas; S104, pairing the IED devices in each bay; S105, importing the power system plant model file, and analyzing the topological structure of the power system plant; S106, according to the pairing relationship of the bay equipment in step S104, the main transformer branch attributes are associated, and the final plant physical model file with the main transformer branch attributes is output; S107. Analyze the final plant physical model file through a visualization generation tool to obtain a corresponding visualization view.

[0006] Further, extracting the IED device type in the IED information specifically includes the following operations: S201, extracting the IED device type according to the IED name; S202: Extract the IED device type according to the IED description.

[0007] Furthermore, according to the IED name, the IED device type is extracted, which specifically includes the following operations: The number of characters in the IED name is determined. If the number of characters is 8, the first two characters of the IED name are extracted. Based on the first conversion rule, the first two characters are converted according to their contents to obtain the IED device type. If it is not 8 characters, the first character of the IED name is extracted, and based on the second conversion rule, the extracted first character is converted according to its content to obtain the IED device type.

[0008] Further, according to the IED description, the IED device type is extracted, which specifically includes the following operations: S301, initializing a type queue, and writing a number of different type words into the type queue in order from first to last; S302, sequentially taking out a type word from the type queue, and determining whether the type word is included in the IED description each time a type word is taken out; S303: If the IED description contains the type word extracted this time, determine the IED device type according to the type word; if the IED description does not contain the type word extracted this time, re-execute S302.

[0009] Furthermore, the low voltage side interval equipment is divided from the IED information, which specifically includes the following operations: S401, extracting characters according to the IED name, extracting numbers from the first five characters of the IED name, and determining the corresponding voltage level according to the extracted numbers; S402, extracting a voltage level description according to the IED description, and determining a voltage level according to the voltage level description; S403, according to the IED devices of each voltage level, analyzing the voltage level structure of the current SCD, and dividing the IED devices of the low voltage side; S404: Determine the low-voltage side branch status of the main transformer according to the divided low-voltage side IED devices.

[0010] Furthermore, the interval area includes a main transformer protection area, a main transformer branch area and other interval areas, and the low-voltage side interval equipment is divided into different interval areas, specifically including: S501, according to the extracted IED information, the IED device types are divided into main transformer protection, main transformer measurement and control, and main transformer protection and measurement integration into the main transformer protection zone; S502, dividing the branch equipment on the low-voltage side of the main transformer into the main transformer branch area according to the branch situation on the low-voltage side of the main transformer; S503, allocating the other equipment on the low voltage side except the IED equipment in the main transformer bay to other bays.

[0011] Furthermore, the devices in each interval are paired, specifically including: For the same main transformer, the equipment in the main transformer protection zone is only connected to the corresponding main transformer branch equipment. The associated bus and set attributes are introduced to pair the IED equipment, determine the combination relationship between the main transformer protection and the main transformer branch equipment, and determine the uniqueness and correlation in the equipment connection relationship through the set attributes. If there are two branches in the main transformer branch area of ​​the same main transformer, the associated busbars of the two branches are adjacent busbars. The associated busbar attributes are introduced, and the connection relationship with other interval area devices is confirmed through the combined relationship between the main transformer protection and the main transformer branch. The uniqueness and correlation of the equipment connection relationship are determined through the set attributes.

[0012] Furthermore, step S106 specifically includes: combining the pairing relationship of the equipment in each bay area, adding FZ attribute under the Unit level of the main transformer branch area equipment, recording the branch number to which the corresponding equipment belongs, and outputting the final plant physical model file with the main transformer branch attribute.

[0013] Furthermore, step S107 specifically includes: S601, importing the final plant physical model file outputted in S106 into a visualization generation tool, parsing the element attributes in the final plant physical model file through the visualization generation tool, and generating a plant topology structure; S602, based on the plant and station topology structure, generate a visualized plant and station secondary circuit connection diagram through topology model association; S603, filtering and selecting the main transformer branch number based on the plant secondary circuit connection diagram, and retrieving the relevant circuit wiring diagram of the main transformer branch related equipment.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an application method for modeling a multi-branch circuit on the low-voltage side of a main transformer. By confirming the low-voltage side IED device in the SCD file, the low-voltage side IED device is divided into different interval areas, and the connection relationship of each IED device in the interval area is paired. The physical connection relationship of the multi-branch device on the low-voltage side is digitally modeled and applied to secondary circuit visualization. When viewing digital drawings, the secondary circuit view of the main transformer branch device can be quickly and accurately found by using branch number condition filtering, thereby reducing the search steps, excluding unnecessary circuit views, and improving the work efficiency of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the overall process of an application method for modeling a multi-branch circuit on the low-voltage side of a main transformer provided by an embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the connection relationship of the interval partitions provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The enumerated embodiments are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] Reference Figure 1 This embodiment provides a main transformer low-voltage side multi-branch circuit modeling application method, the method comprising the following steps: S101. Import the SCD file and parse the IED information in the SCD file.

[0020] Exemplarily, this embodiment parses IED information according to Appendix B Table B.1 “IED name table” of DL / T 1873 “Technical Specifications for Smart Substation System Configuration Description (SCD) File”.

[0021] S102, extracting IED information and dividing low-voltage side compartment equipment therefrom.

[0022] Obviously, the low voltage side interval device is an IED device. As a possible implementation, extracting the IED device type in the IED information specifically includes the following operations: S201. Extract the IED device type according to the IED name.

[0023] This step specifically includes the following operations: The number of characters in the IED name is judged. If it is 8 characters, the first two characters of the IED name are extracted. Based on the first conversion rule, the first two characters are converted according to their contents to obtain the IED device type.

[0024] Exemplarily, the first conversion rule is specifically: convert "P_" into "protection", convert "PC_" into "protection and measurement in one", convert "I_" into "intelligent terminal", convert "M_" into "merging unit", and convert "MI" into "merging and intelligence in one" to obtain the IED device type.

[0025] If it is not 8 characters, the first character of the IED name is extracted, and based on the second conversion rule, the extracted first character is converted according to its content to obtain the IED device type.

[0026] Exemplarily, the second conversion rule is specifically: convert "P" to "protection", convert "S" to "integrated protection and measurement", convert "M" to "merging unit", convert "I" to "intelligent terminal", and convert "U" to "integrated intelligence" to obtain the IED device type.

[0027] Table 1 lists the attribute information tables generated by four IED devices based on the IED names.

[0028] Table 1 IED attribute information

[0029] S202: Extract the IED device type according to the IED description.

[0030] As a possible implementation method, this step specifically includes the following operations: S301, initialize a type queue, and write a number of different type words into the type queue in order from first to last. The type words are in order of "intelligent terminal", "merging unit", "integrated protection and measurement / protection and measurement / protection and measurement and control", "integrated intelligence unit / intelligent unit / integrated intelligence terminal / integrated intelligence", "protection", and "measurement and control".

[0031] S302, taking out a type word from the type queue in sequence, and determining whether the type word is included in the IED description each time a type word is taken out.

[0032] S303: If the IED description contains the type word extracted this time, the IED device type is determined according to the type word. If the IED description does not contain the type word extracted this time, S302 is executed again. For example, if the IED description contains the keyword "integrated protection and measurement" or "protection and measurement" or "protection, measurement and control", the IED device type is integrated protection and measurement. Otherwise, a new type word is extracted from the type queue for judgment.

[0033] In this embodiment, the IED device object and type are preferentially based on the IED device object and type extracted according to the IED name. When the IED device object and type are extracted according to the IED name, the IED device object and type are extracted according to the IED description.

[0034] S103, dividing the low-voltage side partition equipment into different partition areas.

[0035] S104: Pair the IED devices in each bay.

[0036] S105. Import the power system plant model file and analyze the topological structure of the power system plant.

[0037] Exemplarily, the power system plant model file is in XML format, which integrates the inter-cabinet connection relationship of the design institute's blueprint and the intra-cabinet connection relationship provided by the manufacturer. The file mainly includes: Region (small room), Cableset (inter-cabinet cable) two levels, there are multiple Cubicles (panel cabinets) under Region, Cubicle level contains Unit (equipment), TerminalBlock (terminal block), AirSwitch (air switch), Strap (pressure plate), ResetButton (button), ChangeSwitch (change switch), Relay (relay), Inwire (in-cabinet wire) and other elements, TerminalBlock contains terminal block terminals, Cableset contains multiple Wireset (cable core) and Coreset (optical cable core) elements. By matching keywords such as Cubicle (panel), Unit (equipment), TerminalBlock (terminal block), AirSwitch (circuit switch), Strap (pressure plate), ResetButton (button), ChangeSwitch (change switch), Relay (relay), Inwire (wire in the cabinet), etc., you can get the small room, panel, equipment, components, attributes and subordinate relationships. By matching the attributes in the Cable element, you can get the connection between the panels and cabinets, and by matching the Core, you can describe the connection relationship between the terminals.

[0038] In smart substations, the secondary circuit model does not describe the virtual circuit connection between devices, but only describes the optical cable connection between devices. The SCD file is parsed to describe the virtual circuit connection between devices. After the model is parsed, the model file structure diagram of the plant is generated. The model file structure mainly includes: Substation (substation) level, multiple Cubicle (panel cabinet) elements under the Substation level, multiple TerminalBlock (terminal block) elements under the Cubicle level, and multiple CTerminal (terminal) subnodes under the TerminalBlock (terminal block) level.

[0039] S106. According to the pairing relationship of the bay equipment in step S104, the main transformer branch attributes are associated, and a final plant physical model file with the main transformer branch attributes is output.

[0040] S107. Analyze the final plant physical model file through a visualization generation tool to obtain a corresponding visualization view.

[0041] As a possible implementation, in S102, dividing the low-voltage side interval equipment from the IED information specifically includes the following operations: S401 . Extract characters according to the IED name, extract numbers from the first five characters of the IED name, and determine the corresponding voltage level according to the extracted numbers.

[0042] The numbers in the first five characters of the IED name mainly include 75, 50, 22, 11, 66, 35, and 10, which represent the voltage levels of 750 kV, 500 kV, 220 kV, 110 kV, 66 kV, 35 kV, and 10 kV, respectively. Table 2 lists the voltage level information generated by 4 IEDs based on the IED name.

[0043] Table 2 Voltage level information

[0044] S402: extract the voltage level description according to the IED description, and determine the voltage level according to the voltage level description.

[0045] This step directly determines the voltage level by extracting the kV unit and the number before the kV unit in the IED description. For example, when the extracted voltage level description is "750kV", the corresponding voltage level is 750kV; when the extracted voltage level description is "220kV", the corresponding voltage level is 220kV.

[0046] S403: According to the IED devices of each voltage level, the voltage level structure of the current SCD is analyzed to divide the IED devices of the low voltage side.

[0047] Exemplary, standard voltage level structures may include: The voltage level structure of a 500kV substation is: 500kV, 220kV, 35kV; The voltage level structure of a 220kV substation is: 220kV, 110kV, 10kV; The voltage level structure of a 110kV substation is: 110kV, 35kV, 10kV.

[0048] Some substations have only two voltage levels, for example: The voltage level structure of 220kV substation is: 220kV, 66kV; The voltage level structure of a 110kV substation is: 110kV, 10kV.

[0049] The voltage level structure is analyzed and arranged in order of voltage level. The voltage level with the smallest number is the low voltage side in the SCD file. The IED devices belonging to the voltage level are extracted to divide the IED devices on the low voltage side of the SCD file.

[0050] S404: Determine the low-voltage side branch status of the main transformer according to the divided low-voltage side IED devices.

[0051] Exemplarily, judging the branch situation on the low-voltage side of the main transformer may be: When parsing the IED device name naming specification, the branch situation is directly determined based on the name, specifically: The main method for judging the characters of the IED name is: parse the IED names of the low-voltage side main transformer merging unit, integrated intelligent unit, intelligent terminal and other IED devices, extract the last three characters in the name, and in order from left to right, the third to last character is the main transformer object. If the number is 1, it is the #1 main transformer, if the number is 2, it is the #2 main transformer, and so on. When the third to last digit is not 0 and the numbers are the same, compare the second to last digit of the device name of the same type. If the numbers are different, the main transformer has a branch situation, and the branch situation is distinguished according to the number, that is, the number 1 represents the 1 branch, the number 2 represents the 2 branch, and the number 0 represents no branch. The IED device to which it belongs is the interval device corresponding to the branch. Table 3 lists the branch situations generated by 4 IEDs based on the IED name.

[0052] Table 3 Branches generated based on IED names

[0053] When the parsed IED device name is not standardized, read the IED description. If the description contains the keyword "branch", determine the main transformer branch situation based on the keyword, specifically: Parse the IED description of IED devices such as the main transformer merging unit, integrated intelligent unit, and intelligent terminal on the low-voltage side, and extract keywords in the IED description. If the keyword "branch" appears, it means that the main transformer has a branch at this time. If the keyword "branch" does not exist, it means that the main transformer does not have a branch at this time. Further parse the IED name of the device, compare the type, voltage level, object, and set information of the device. If all are consistent and there are multiple devices, it means that the main transformer has multiple branches at this time. If the type, voltage level, object, and set information of the device are the same at this time, and there is only a single set of equipment, it means that the main transformer has no branches or only a single branch at this time. The keyword "main transformer" is used to determine the main transformer object, that is, the Arabic numerals, Roman numerals, and Chinese numerals that appear on both sides of the keyword "main transformer" are extracted to determine the main transformer object to which it belongs. The method is to extract the numbers, convert them into a unified integer through encoding, and sort them from small to large. The smallest number is the #1 main transformer, and the other numbers are deduced in the same way. If the device with the keyword "branch" in the description exists, it is determined to be the IED device of the branch interval.

[0054] In this embodiment, the interval area includes a main transformer protection area, a main transformer branch area and other interval areas. In S103, the low-voltage side interval equipment is divided into different interval areas, specifically including: S501. According to the extracted IED information, the IED equipment types are divided into main transformer protection, main transformer measurement and control, and main transformer protection and measurement integration into main transformer protection zones. The number of main transformer protection zones is the same as the number of main transformers.

[0055] The equipment divided into the bay area is modeled as a standard model and the model attributes are defined. The standard equipment model is named based on: IED type, IED device object, bay equipment area, branch, and set. The standard model naming format is A_B_CDEFG, and the attributes defined by each letter are listed in Table 4.

[0056] Table 4 IED model attributes

[0057] For example, define a standard template named A_B_CD_E, and the specific definition is as follows: (1) A represents the equipment type, which mainly includes: P: protection, C: measurement and control, I: intelligent terminal, M: merging unit, PC: protection and measurement integration, MI: integration and intelligence integration, SP: standby automatic investment; (2) B represents equipment objects, mainly including: L: line, T: main transformer, H: main transformer body, K: section, J: busbar, M: busbar, X: reactance, C: capacitor, Z: backup automatic switch, S: station transformer, O: others; (3) CD represents the main transformer protection zone to which the equipment belongs: 01: #1 main transformer protection zone; 02: #2 main transformer protection zone; 03: #3 main transformer protection zone; if it is 00, it means there is no main transformer interval at this time; (4) EF represents the branch area to which the equipment belongs, and is used to distinguish different branches of the main transformer. 01: the first branch of the main transformer; 02: the second branch of the main transformer; 00: the single branch of the main transformer; (5) G represents the branch area to which the equipment belongs and the type of set: A: first set; B: second set; 0: single set.

[0058] In the embodiment of the present invention, a main transformer protection zone model is modeled, and the EF attributes of the main transformer protection zone equipment in the model are all default values ​​00. The naming method of some standard protection zone equipment models is shown in Table 5.

[0059] Table 5 Naming of some standard protection zone equipment models

[0060] S502. According to the branching situation on the low-voltage side of the main transformer, divide the branching equipment on the low-voltage side of the main transformer into the main transformer branch area.

[0061] In this step, the same number of main transformer branch areas are divided as the number of main transformers on the low-voltage side of the main transformer. If there are multiple branches on the low-voltage side, the corresponding multi-branch area is divided into branch area 1 and branch area 2 in sequence. The IED devices in the main transformer branch area only include the IED devices of the main transformer branch, such as the main transformer intelligent terminal, merging unit, and integrated intelligent device. The main transformer branch area equipment is modeled as a standard model. The naming method of some standard main transformer branch area equipment models is shown in Table 6.

[0062] Table 6 Naming of some standard main transformer branch area equipment models

[0063] S503, allocating the other equipment on the low voltage side except the IED equipment in the main transformer bay to other bays.

[0064] The other IED devices on the low voltage side, except for the main transformer bay IED devices, are typically: segmentation, backup automatic switching, busbar, capacitor, reactor, grounding transformer equipment, etc. These IED devices are divided into other bay partitions. The standard model is modeled for the other bay area equipment, and the names of some other bay area equipment models are shown in Table 7.

[0065] Table 7 Naming of some other compartment equipment models

[0066] Reference Figure 2In step S104, according to the interval partitioning of S103, the IED devices in each interval area are paired, specifically including: For the same main transformer, the equipment in the main transformer protection zone is only connected to the corresponding main transformer branch equipment. The associated bus and set attributes are introduced to pair the IED equipment, determine the combination relationship between the main transformer protection and the main transformer branch equipment, and determine the uniqueness and correlation in the equipment connection relationship through the set attributes.

[0067] If there are two branches in the main transformer branch area of ​​the same main transformer, the associated busbars of the two branches are adjacent busbars. The associated busbar attributes are introduced, and the connection relationship with other interval area devices is confirmed through the combined relationship between the main transformer protection and the main transformer branch. The uniqueness and correlation of the equipment connection relationship are determined through the set attributes.

[0068] As a possible implementation method, step S106 specifically includes: by associating the main transformer branch equipment and segmented interval equipment models with the parsed plant physical model, by importing the standard equipment model to parse the equipment type, object, branch number, set and other attributes, and searching and matching with the Unit (equipment) in the plant physical model through the IED name and description. The program obtains the branch attributes in the standard model file, and automatically adds the FZ attribute under the Unit level in the plant physical model file, aiming to describe the main transformer branch number to which the equipment belongs. Associate the branch attributes in the standard model file to the FZ attribute. The number 0 in the FZ attribute represents a single branch or no branch, the number 1 represents the main transformer branch one, and the number 2 represents the main transformer branch two. Combined with the pairing relationship of the equipment in each interval area in step 4, associate the required main transformer and segmented interval equipment, and output the final physical model file with the main transformer branch attributes.

[0069] As a possible implementation, step S107 specifically includes: S601, importing the final plant physical model file outputted by S106 into a visualization generation tool, parsing the element attributes in the final plant physical model file through the visualization generation tool, and generating a plant topology structure.

[0070] S602. Based on the plant topology structure, a visualized plant secondary circuit connection diagram is generated by associating the topology model.

[0071] S603, filtering and selecting the main transformer branch number based on the plant secondary circuit connection diagram, and retrieving the relevant circuit wiring diagram of the main transformer branch related equipment.

[0072] In this implementation, through the topological model, typical graphics elements of equipment, components, and cabinets are created, the properties of the cables in the model file are parsed, the cross-connection relationship in each graphic element is obtained, and finally a visualization view of the graphic element connection is automatically generated. In the visualization interface, a filtering option bar is set to facilitate the screening of the circuit diagrams that need to be viewed. It supports displaying the secondary circuit connection schematic diagram of the cabinet according to the cabinet number. Since there are many circuits connected to a cabinet in the substation, the branch number filter condition can also be used for the equipment in the main transformer bay to retrieve the visualization diagram of the main transformer branch-related equipment. The visualization tool parses the FZ attribute in the model file to obtain the branch number to which the equipment belongs. The user selects the main transformer object and the branch number for filtering. The visualization interface jumps and switches the drawings according to the filtering conditions, and displays the current main transformer branch number and the secondary circuit of the associated main transformer object, which is convenient for users to quickly view the secondary circuit diagram of the main transformer branch bay equipment.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for modeling and applying multi-branch circuits on the low-voltage side of a main transformer, characterized in that: The method comprises: S101, import the SCD file and parse the IED information in the SCD file; S102, extracting IED information and dividing low-voltage side compartment equipment therefrom; S103, dividing the low-voltage side interval equipment into different interval areas; S104, pairing the IED devices in each bay; S105, importing the power system plant model file, and analyzing the topological structure of the power system plant; S106, according to the pairing relationship of the bay equipment in step S104, the main transformer branch attributes are associated, and the final plant physical model file with the main transformer branch attributes is output; S107. Analyze the final plant physical model file through a visualization generation tool to obtain a corresponding visualization view.

2. According to claim 1, a main transformer low-voltage side multi-branch circuit modeling application method is characterized in that: Extract the IED device type from the IED information, including the following operations: S201, extracting the IED device type according to the IED name; S202: Extract the IED device type according to the IED description.

3. The method for modeling and applying a multi-branch circuit on the low-voltage side of a main transformer according to claim 2 is characterized in that: Extract the IED device type based on the IED name, including the following operations: The number of characters in the IED name is determined. If the number of characters is 8, the first two characters of the IED name are extracted. Based on the first conversion rule, the first two characters are converted according to their contents to obtain the IED device type. If it is not 8 characters, the first character of the IED name is extracted, and based on the second conversion rule, the extracted first character is converted according to its content to obtain the IED device type.

4. According to claim 2, a main transformer low-voltage side multi-branch circuit modeling application method is characterized in that: Extract the IED device type according to the IED description, including the following operations: S301, initializing a type queue, and writing a number of different type words into the type queue in order from first to last; S302, sequentially taking out a type word from the type queue, and determining whether the type word is included in the IED description each time a type word is taken out; S303: If the IED description contains the type word extracted this time, determine the IED device type according to the type word; if the IED description does not contain the type word extracted this time, re-execute S302.

5. The method for modeling and applying a multi-branch circuit on the low-voltage side of a main transformer according to claim 1 is characterized in that: Isolate the low voltage side compartment equipment from the IED information, including the following operations: S401, extracting characters according to the IED name, extracting numbers from the first five characters of the IED name, and determining the corresponding voltage level according to the extracted numbers; S402, extracting a voltage level description according to the IED description, and determining a voltage level according to the voltage level description; S403, according to the IED devices of each voltage level, analyzing the voltage level structure of the current SCD, and dividing the IED devices of the low voltage side; S404: Determine the low-voltage side branch status of the main transformer according to the divided low-voltage side IED devices.

6. A main transformer low voltage side multi-branch circuit modeling application method according to claim 5, characterized in that: The interval area includes the main transformer protection area, the main transformer branch area and other interval areas, and the low-voltage side interval equipment is divided into different interval areas, specifically including: S501, according to the extracted IED information, the IED device types are divided into main transformer protection, main transformer measurement and control, and main transformer protection and measurement integration into the main transformer protection zone; S502, dividing the branch equipment on the low-voltage side of the main transformer into the main transformer branch area according to the branch situation on the low-voltage side of the main transformer; S503, allocating the other equipment on the low voltage side except the IED equipment in the main transformer bay to other bays.

7. A main transformer low voltage side multi-branch circuit modeling application method according to claim 6, characterized in that: Pair the devices in each compartment, including: For the same main transformer, the equipment in the main transformer protection zone is only connected to the corresponding main transformer branch equipment. The associated bus and set attributes are introduced to pair the IED equipment, determine the combination relationship between the main transformer protection and the main transformer branch equipment, and determine the uniqueness and correlation in the equipment connection relationship through the set attributes. If there are two branches in the main transformer branch area of ​​the same main transformer, the associated busbars of the two branches are adjacent busbars. The associated busbar attributes are introduced, and the connection relationship with other interval area devices is confirmed through the combined relationship between the main transformer protection and the main transformer branch. The uniqueness and correlation of the equipment connection relationship are determined through the set attributes.

8. The method for modeling and applying a multi-branch circuit on the low-voltage side of a main transformer according to claim 1 is characterized in that: Step S106 specifically includes: combining the pairing relationship of the equipment in each bay area, adding FZ attribute under the Unit level of the main transformer branch area equipment, recording the branch number to which the corresponding equipment belongs, and outputting the final plant physical model file with the main transformer branch attribute.

9. The method for modeling and applying a multi-branch circuit on the low-voltage side of a main transformer according to claim 1 is characterized in that: Step S107 specifically includes: S601, importing the final plant physical model file outputted by S106 into a visualization generation tool, parsing the element attributes in the final plant physical model file through the visualization generation tool, and generating a plant topology structure; S602, based on the plant and station topology structure, generate a visualized plant and station secondary circuit connection diagram through topology model association; S603, filtering and selecting the main transformer branch number based on the plant secondary circuit connection diagram, and retrieving the relevant circuit wiring diagram of the main transformer branch related equipment.

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