A modeling application method for multi-branch circuits on the low-voltage side of a main transformer

Abstract

The present invention provides an application method for modeling a multi-branch circuit on the low-voltage side of a main transformer, comprising the following steps: S101, importing an SCD file and parsing IED information in the SCD file; S102, extracting IED information and dividing low-voltage side bay devices therefrom; S103, dividing the low-voltage side bay devices into different bays; S104, pairing the IED devices in each bay; S105, importing a power system plant model file and parsing the topological structure of the power system plant; S106, associating the main transformer branch attributes based on the pairing relationship of the bay devices in step S104, and outputting a final plant physical model file with the main transformer branch attributes; S107, parsing the final plant physical model file using a visualization generation tool to obtain a corresponding visualization view. The method can quickly and accurately find secondary circuit views of main transformer branch devices, reduce search steps, eliminate unnecessary circuit views, and improve the work efficiency of users.

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 the low-voltage side of a main transformer. Background Art

[0002] Currently, my country is vigorously developing power construction and reducing the consumption of non-renewable resources. Substations, as a core component of power construction, are also being gradually upgraded. Traditional substation design methods have primarily relied on outputting unstructured documents such as CAD drawings, which cannot be effectively converted into digital models. This has led to difficulties in intelligent acceptance and subsequent operation and maintenance. With the increasing trend towards digital design and construction of substations and intelligent upgrades, my country's power grid has also made significant progress towards informatization, digitization, and intelligence.

[0003] While the technology for visualizing substation drawings has matured, current visualization tools only support filtering by panel number. The resulting secondary circuit diagrams contain numerous devices and circuits, making it difficult to quickly locate the required drawings. Manual search based on the opposite panel number is required, resulting in low efficiency. More specifically, as a bay object spanning voltage levels, the main transformer's drawings and circuit information are significantly more complex than those for other bay objects that do not span voltage levels. This is especially true when multiple branches exist on the main transformer's low-voltage side. The circuit coordination relationships between the multi-branch bays and the main transformer bays, and between the corresponding segmented bays and the main transformer bays, are complex. Conventional drawing reading methods and model circuit visualization lack a supporting modeling system, resulting in inaccurate information presentation. The real and virtual circuit designs produced by some design firms are also prone to errors in the coordination of different branches. Therefore, it is urgent to address the complex multi-branch circuits and unintuitive information presentation on the main transformer's low-voltage side. A targeted multi-branch circuit modeling method based on standardized IED nomenclature is needed to enable the modeling and application of multi-branch circuits on the main transformer's low-voltage side. 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, 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 the modeling and application of multi-branch circuits on the low-voltage side of the main transformer.

[0005] To achieve the above-mentioned object, 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:

[0006] S101. Import the SCD file and parse the IED information in the SCD file;

[0007] S102, extracting IED information and dividing the low-voltage side compartment equipment therefrom;

[0008] S103, dividing the low-voltage side partition equipment into different partition areas;

[0009] S104, pairing the IED devices in each bay;

[0010] S105, importing the power system plant model file and analyzing the topological structure of the power system plant;

[0011] S106. According to the pairing relationship of the bay devices 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;

[0012] S107. Parse the final plant physical model file using a visualization generation tool to obtain a corresponding visualization view.

[0013] Furthermore, the IED device type in the IED information is extracted, specifically including the following operations:

[0014] S201. Extract the IED device type according to the IED name;

[0015] S202: Extract the IED device type according to the IED description.

[0016] Furthermore, the IED device type is extracted based on the IED name, which specifically includes the following operations:

[0017] Determine the number of characters in the IED name. If the number is 8, extract the first two characters of the IED name. Based on the first conversion rule, convert the first two characters according to their contents to obtain the IED device type.

[0018] 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.

[0019] Furthermore, the IED device type is extracted according to the IED description, which specifically includes the following operations:

[0020] S301, initialize a type queue, and write a number of different type words into the type queue in order from first to last;

[0021] 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;

[0022] 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, execute S302 again.

[0023] Furthermore, the low-voltage side compartment equipment is divided from the IED information, which specifically includes the following operations:

[0024] S401, extracting characters from the IED name, extracting numbers from the first five characters of the IED name, and determining the corresponding voltage level based on the extracted numbers;

[0025] S402: extracting a voltage level description from the IED description, and determining a voltage level based on the voltage level description;

[0026] S403, according to the IED devices of each voltage level, analyze the voltage level structure of the current SCD and divide the IED devices on the low voltage side;

[0027] S404: Determine the low-voltage side branch status of the main transformer based on the divided low-voltage side IED devices.

[0028] 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:

[0029] 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;

[0030] S502. Divide the low-voltage side branch equipment of the main transformer into the main transformer branch area according to the low-voltage side branch situation of the main transformer;

[0031] S503: Allocate all devices on the low-voltage side except the IED devices in the main transformer bay to other bays.

[0032] Furthermore, the devices in each compartment are paired, specifically including:

[0033] For the same main transformer, the devices in the main transformer protection zone are only connected to the corresponding main transformer branch devices. By introducing the associated bus and set attributes, IED devices are paired to determine the combination relationship between the main transformer protection and the main transformer branch devices. The set attributes are used to determine the uniqueness and correlation of the device connection relationship.

[0034] 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 attribute is introduced, and the connection relationship with the equipment in other bays is confirmed through the combination 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 attribute.

[0035] Furthermore, step S106 specifically includes: combining the pairing relationship of the equipment in each bay area, adding FZ attributes 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 attributes.

[0036] Furthermore, step S107 specifically includes:

[0037] 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 by the visualization generation tool, and generating a plant topology structure;

[0038] S602. Based on the plant / station topology structure, generate a visualized plant / station secondary circuit connection diagram by associating the topology model;

[0039] S603. Filter the main transformer branch number based on the plant secondary circuit connection diagram, and retrieve the relevant circuit wiring diagram of the main transformer branch related equipment.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 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 intervals, and the connection relationship of each IED device in the interval is paired. The physical connection relationship of the multi-branch device on the low-voltage side is digitally modeled and applied to the 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 the branch number condition filtering, reducing the search steps, eliminating unnecessary circuit views, and improving the work efficiency of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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.

[0043] 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.

[0044] Figure 2 It is a schematic diagram of the connection relationship of the interval partitions provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The principles and features of the present invention are described below with reference to 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.

[0046] Reference Figure 1 This embodiment provides a method for modeling and applying a multi-branch circuit on the low-voltage side of a main transformer, the method comprising the following steps:

[0047] S101. Import an SCD file and parse IED information in the SCD file.

[0048] Illustratively, this embodiment parses IED information according to Table B.1 (IED name table) in Appendix B of DL / T 1873 (Technical Specifications for Smart Substation System Configuration Description (SCD) Files).

[0049] S102: Extract IED information and separate low-voltage side compartment devices.

[0050] Obviously, the low-voltage side partition device is an IED device. As a possible implementation, extracting the IED device type from the IED information specifically includes the following operations:

[0051] S201. Extract the IED device type according to the IED name.

[0052] This step specifically includes the following operations:

[0053] The number of characters in the IED name is determined. If the number 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] Table 1 lists the attribute information tables generated for four IED devices based on the IED names.

[0058] Table 1 IED attribute information

[0059]

[0060] S202: Extract the IED device type according to the IED description.

[0061] As a possible implementation, this step specifically includes the following operations:

[0062] S301. Initialize a type queue and write a number of different type words into the type queue in descending order. The type words are, in descending order, "intelligent terminal," "merging unit," "integrated protection and measurement / integrated protection and measurement and control," "integrated intelligent unit / intelligent unit / integrated intelligent terminal / integrated intelligent unit," "protection," and "measurement and control."

[0063] S302: Take out a type word from the type queue in sequence, and determine whether the IED description contains the type word each time the type word is taken out.

[0064] S303: If the IED description contains the newly extracted type word, the IED device type is determined based on the newly extracted type word. If the IED description does not contain the newly extracted type word, 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 retrieved from the type queue for determination.

[0065] 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. If the IED device object and type extraction by the IED name fails, the IED device object and type extracted by the IED description is used as the basis.

[0066] S103. Divide the low-voltage side partition equipment into different partition areas.

[0067] S104: Pair the IED devices in each bay.

[0068] S105. Import the power system plant model file and analyze the topological structure of the power system plant.

[0069] For example, the power system plant model file is in XML format. The file 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 two levels: Region (small room) and Cableset (inter-cabinet cables). There are multiple Cubicles (panel cabinets) under Region. The Cubicle level contains Unit (equipment), TerminalBlock (terminal block), AirSwitch (circuit breaker), Strap (pressure plate), ResetButton (button), ChangeSwitch (change switch), Relay (relay), Inwire (in-cabinet wire) and other elements. TerminalBlock contains terminal block terminals, and Cableset contains multiple Wireset (cable core) and Coreset (optical cable core) elements. By matching keywords on elements such as Cubicle (panel), Unit (device), TerminalBlock (terminal block), AirSwitch (circuit breaker), Strap (strap), ResetButton (button), ChangeSwitch (change switch), Relay (relay), and Inwire (in-panel wiring), you can retrieve information about cubicles, panels, devices, components, attributes, and relationships. You can also match attributes within the Cable element to retrieve connections between panels, and match Core to describe the connection relationships between terminals.

[0070] In a smart substation, the secondary circuit model does not describe the virtual circuit connections between devices, only the optical cable connections between them. Parsing the SCD file describes the virtual circuit connections between devices. After the model is parsed, the substation model file structure diagram is generated. The model file structure mainly includes: a Substation level, multiple Cubicle elements under the Substation level, multiple TerminalBlock elements under the Cubicle level, and multiple CTerminal subnodes under the TerminalBlock level.

[0071] 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.

[0072] S107. Parse the final plant physical model file using a visualization generation tool to obtain a corresponding visualization view.

[0073] As a possible implementation, in S102, the low-voltage side bay devices are divided from the IED information, specifically including the following operations:

[0074] 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.

[0075] The numbers in the first five characters of an IED name primarily include 75, 50, 22, 11, 66, 35, and 10, representing 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 four IEDs based on their names.

[0076] Table 2 Voltage level information

[0077]

[0078] S402: Extract the voltage level description according to the IED description, and determine the voltage level according to the voltage level description.

[0079] This step directly determines the voltage level by extracting the kV unit and the number preceding the kV unit from 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.

[0080] S403: Analyze the voltage level structure of the current SCD according to the IED devices of each voltage level, and divide the IED devices of the low voltage side.

[0081] For example, a standard voltage level structure may include:

[0082] The voltage level structure of a 500kV substation is: 500kV, 220kV, 35kV;

[0083] The voltage level structure of a 220kV substation is: 220kV, 110kV, 10kV;

[0084] The voltage level structure of a 110kV substation is: 110kV, 35kV, and 10kV.

[0085] Some substations have only two voltage levels, for example:

[0086] The voltage level structure of a 220kV substation is: 220kV, 66kV;

[0087] The voltage level structure of a 110kV substation is: 110kV, 10kV.

[0088] The parsed voltage level structure is sorted in descending order. The voltage level with the smallest number is the low-voltage side of the SCD file. The IEDs belonging to that voltage level are extracted, and the low-voltage IEDs in the SCD file are divided.

[0089] S404: Determine the low-voltage side branch status of the main transformer based on the divided low-voltage side IED devices.

[0090] For example, the condition of the branch on the low-voltage side of the main transformer can be determined by:

[0091] When parsing the IED device name naming convention, the branch situation is directly determined based on the name, specifically:

[0092] The main method for determining IED names based on character encoding is to parse the IED names of low-voltage main transformer merging units, integrated intelligent devices, and smart terminals. The last three characters of the names are extracted, and the third-to-last character is the main transformer, starting from left to right. If the number is 1, it indicates main transformer #1; if the number is 2, it indicates main transformer #2; and so on for other numbers. If the third-to-last digit is not 0 and the numbers are the same, the second-to-last digit of the names of devices of the same type is compared. If the numbers are different, the main transformer has a branch. The branch is identified by the number: 1 indicates branch 1, 2 indicates branch 2, and 0 indicates no branch. The associated IED device is the bay device corresponding to the branch. Table 3 lists the branch information generated for four IEDs based on the IED name.

[0093] Table 3 Branches generated based on IED names

[0094]

[0095] When parsing an IED device name that is not standardized, read the IED description. If the description contains the keyword "branch", determine the main transformer branch status based on the keyword. Specifically:

[0096] Parse the IED descriptions of low-voltage main transformer merging units, integrated intelligent devices, and smart terminals, and extract keywords from the IED descriptions. If the keyword "branch" appears, the main transformer has a branch. If the keyword "branch" is absent, the main transformer does not have a branch. Further parse the device's IED name and compare the device type, voltage level, object, and set information. If all match and there are multiple devices, the main transformer has multiple branches. If the device type, voltage level, object, and set information are the same and only a single device exists, the main transformer has no branches or only a single branch. Use the keyword "main transformer" to identify the main transformer. This involves extracting the Arabic numerals, Roman numerals, and Chinese numerals that appear on either side of the keyword to determine the main transformer. This is done by extracting the numbers, converting them to integers through encoding, and sorting them in ascending order. The smallest number is main transformer #1, and the remaining numbers follow this order. If the device description contains the keyword "branch," it is identified as the IED device for that branch bay.

[0097] In this embodiment, the interval area includes the main transformer protection area, the main transformer branch area and other interval areas. In S103, the low-voltage side interval equipment is divided into different interval areas, specifically including:

[0098] S501: Based on 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 main transformer protection zones. The number of main transformer protection zones is the same as the number of main transformers.

[0099] Create a standard model for the devices assigned to the bays and define the model attributes. Standard device models are named based on IED type, IED device object, bay area, branch, and suite. The standard model naming format is A_B_CDEFG. Table 4 lists the attributes defined by each letter.

[0100] Table 4 IED model attributes

[0101]

[0102] For example, define a standard template named A_B_CD_E, and the specific definition is as follows:

[0103] (1) A represents the equipment type, mainly including: P: protection, C: measurement and control, I: intelligent terminal, M: merging unit, PC: integrated protection and measurement, MI: integrated intelligence, SP: standby automatic start;

[0104] (2) B represents the equipment object, mainly including: L: line, T: main transformer, H: main transformer body, K: section, J: busbar, M: busbar, X: reactor, C: capacitor, Z: standby automatic switch, S: station transformer, O: others;

[0105] (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, there is no main transformer interval at this time;

[0106] (4) EF represents the branch area to which the equipment belongs, which 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;

[0107] (5) G represents the branch area to which the equipment belongs and the type of set: A: the first set; B: the second set; 0: a single set.

[0108] 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.

[0109] Table 5 Naming of some standard protection zone equipment models

[0110]

[0111] S502. Divide 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.

[0112] In this step, the number of main transformer branch areas is divided according to the number of main transformers on the low-voltage side. If the low-voltage side has multiple branches, the corresponding multi-branch area is divided into branch area 1 and branch area 2, respectively. The IEDs in the main transformer branch area only include those in the main transformer branch, such as the main transformer intelligent terminal, merging unit, and integrated intelligent device. Standard models are modeled for the main transformer branch area equipment. Table 6 shows some standard naming methods for main transformer branch area equipment models.

[0113] Table 6 Naming of some standard main transformer branch area equipment models

[0114]

[0115] S503: Allocate all devices on the low-voltage side except the IED devices in the main transformer bay to other bays.

[0116] On the low-voltage side, other IEDs besides those in the main transformer bay typically include sectionalizers, backup automatic switching (BAT), busbars, capacitors, reactors, and grounding transformers. These IEDs are assigned to other bays. Standard models are modeled for these bays. The names of some of the other bay equipment models are shown in Table 7.

[0117] Table 7 Naming of some other spacer equipment models

[0118]

[0119] Reference Figure 2 In step S104, the IED devices in each bay are paired according to the bay partitioning in S103, specifically including:

[0120] For the same main transformer, the devices in the main transformer protection zone are only connected to the corresponding main transformer branch devices. By introducing associated bus and set attributes, IED devices are paired to determine the combination relationship between the main transformer protection and the main transformer branch devices. The uniqueness and correlation in the device connection relationship are determined through the set attributes.

[0121] 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 attribute is introduced, and the connection relationship with the equipment in other bays is confirmed through the combination 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 attribute.

[0122] As a possible implementation method, step S106 specifically includes: associating the main transformer branch equipment and segmented interval equipment models with the parsed plant physical model, importing the standard equipment model to parse the equipment type, object, branch number, set type and other attributes, and searching and matching them 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 to describe the main transformer branch number to which the equipment belongs. Associate the branch attributes in the standard model file with 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.

[0123] As a possible implementation, step S107 specifically includes:

[0124] 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.

[0125] S602. Based on the plant / station topology structure, a visualized plant / station secondary circuit connection diagram is generated by associating the topology model.

[0126] S603. Filter the main transformer branch number based on the plant secondary circuit connection diagram, and retrieve the relevant circuit wiring diagram of the main transformer branch related equipment.

[0127] In this implementation, through the topological model, typical graphics elements of equipment, components, and panels are created, the attributes of the cables in the model file are parsed, the cross-connection relationships in each graphic element are obtained, and finally a visualization view of the graphic element connection is automatically generated. In the visualization interface, a filter 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 panel cabinet centered on the panel cabinet number. Since a panel cabinet in the substation is connected to many circuits, 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 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, so that the user can quickly view the secondary circuit diagram of the main transformer branch bay equipment.

[0128] 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 principles of the present invention should be included in the scope of protection 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 the low-voltage side compartment equipment therefrom; S103, dividing the low-voltage side partition equipment into different partition 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 devices 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; S107. Parse the final plant physical model file using a visualization generation tool to obtain a corresponding visualization view.

2. 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: Extract the IED device type from the IED information, including the following operations: S201. Extract 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: Determine the number of characters in the IED name. If the number is 8, extract the first two characters of the IED name. Based on the first conversion rule, convert the first two characters 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. 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 description, including 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; 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, execute S302 again.

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 bay equipment from the IED information, including the following operations: S401, extracting characters from the IED name, extracting numbers from the first five characters of the IED name, and determining the corresponding voltage level based on the extracted numbers; S402: extracting a voltage level description from the IED description, and determining a voltage level based on the voltage level description; S403, according to the IED devices of each voltage level, analyze the voltage level structure of the current SCD and divide the IED devices on the low voltage side; S404: Determine the low-voltage side branch status of the main transformer based on 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. Divide the low-voltage side branch equipment of the main transformer into the main transformer branch area according to the low-voltage side branch situation of the main transformer; S503: Allocate all devices on the low-voltage side except the IED devices in the main transformer bay to other bays.

7. The method for modeling and applying a multi-branch circuit on the low-voltage side of a main transformer according to claim 6 is characterized in that: Pair the devices in each bay, including: For the same main transformer, the devices in the main transformer protection zone are only connected to the corresponding main transformer branch devices. By introducing the associated bus and set attributes, IED devices are paired to determine the combination relationship between the main transformer protection and the main transformer branch devices. The set attributes are used to determine the uniqueness and correlation of the device connection relationship. 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 attribute is introduced, and the connection relationship with the equipment in other bays is confirmed through the combination 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 attribute.

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 attributes 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 attributes.

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 in S106 into a visualization generation tool, parsing the element attributes in the final plant physical model file by the visualization generation tool, and generating a plant topology structure; S602. Based on the plant / station topology structure, generate a visualized plant / station secondary circuit connection diagram by associating the topology model; S603. Filter the main transformer branch number based on the plant secondary circuit connection diagram, and retrieve the relevant circuit wiring diagram of the main transformer branch related equipment.

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