Substation design method and system

Abstract

The invention relates to the technical field of substation design, and discloses a substation design method and system. The method comprises the steps of obtaining outgoing line loop information and calculating a load rate of a transformer; matching adaptive equipment specifications based on the transformer parameters; calculating the number of wire cabinets in combination with a preset reserve rate, the cabinet modulus and the loop data; according to a load grade and a current size rule, distributing loops to an outgoing line cabinet and configuring a standby loop; and finally, generating a system construction drawing through multi-dimensional verification. Manual operation is replaced by data driving in the whole process, and automation of the whole process from information input to drawing output is achieved. According to the method, by automatically calculating the load rate, matching the equipment parameters and distributing the outgoing line loop, the tedious work of manually checking information of hundreds of loops by a designer is omitted, and the original design period needing several days is greatly shortened. The technical problems that existing design highly depends on manual operation, a large amount of time is consumed when a designer checks all power utilization loop information, and design efficiency is low are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of substation design, and in particular to a substation design method and system. Background Art

[0002] With the continuous development of society and the economy, the demand for electricity in various industries is increasing. Many enterprises and industrial parks have proposed the transformation of existing power supply systems for production and operation or expansion and upgrade needs. Among them, the design of substations for users below 35kV has become a key link in meeting such needs. As the core node connecting the public power grid and user electrical equipment, the design quality of substations is directly related to the safety, reliability, and economic efficiency of user electricity use. Therefore, in the context of the current continuous increase in electricity demand, the design task of substations below 35kV is becoming increasingly arduous, placing higher demands on the accuracy and efficiency of the design.

[0003] Therefore, when designing a user substation, existing designers must carefully verify the user's various power consumption indicators and collect specific information for each power circuit, including load type, power level, and operating characteristics. Secondly, they must aggregate all collected information to calculate the substation's capacitance and determine core parameters such as the main transformer capacity and outgoing line configuration. Finally, they must report the relevant design parameters to the power supply company. Only after obtaining the company's approval for the power capacity can they begin drawing the substation construction drawings. However, due to significant differences in production processes and load characteristics among different power users, this design process is highly reliant on manual labor. Designers spend a significant amount of time verifying all power circuit information, resulting in low design efficiency. Summary of the Invention

[0004] The present invention provides a substation design method and system, which solves the technical problem that the existing design process is highly dependent on manual operation, designers need to spend a lot of time in checking all power circuit information, resulting in low design efficiency.

[0005] A first aspect of the present invention provides a substation design method, applied to drawing assistant software, comprising: Obtaining outgoing line circuit information of the substation to be designed, and determining the transformers of each outgoing line circuit and the load rate of each transformer according to the outgoing line circuit information; Determining equipment parameters suitable for each transformer based on each transformer and its load rate; Extracting the target number of outgoing line circuits and the target switch module of each transformer from the outgoing line circuit information, and calculating the number of outgoing line cabinets of the substation to be designed by using a preset outgoing line circuit reserve rate, a preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits and the target switch module; Allocating all outgoing line circuits of each transformer according to a preset allocation rule, and placing each outgoing line circuit and a spare circuit in an outgoing line cabinet of the substation to be designed according to the allocation result; The load rate, the equipment parameters, the target number of outgoing line circuits, the target switch module, the preset outgoing line circuit backup rate and the cabinet electrical corresponding to the outgoing line cabinet are verified respectively, and the system construction drawing of the substation to be designed is generated according to the verification results.

[0006] Optionally, the obtaining of outgoing line circuit information of the substation to be designed, and determining the transformer of each outgoing line circuit and the load rate of each transformer according to the outgoing line circuit information, includes: Fill in the information of each outgoing line circuit in the load statistics distribution table according to the project requirements of the substation to be designed; Calculating the calculated current of each outgoing line loop in the outgoing line loop information; According to the calculated current, selecting the set current of the outgoing line switch of the substation to be designed; Generate circuit information of the substation to be designed by using the circuit number, load name, equipment capacity, required coefficient, calculated current and set current of each outgoing circuit; According to the outgoing line loop information, the transformer corresponding to each outgoing line loop and the load rate of the transformer are determined.

[0007] Optionally, determining equipment parameters adapted for each transformer based on each transformer and its load rate includes: Reading the load statistics distribution table; Based on the load statistical distribution table and preset design requirements, equipment parameters suitable for each transformer are selected through each transformer and the load rate of each transformer; wherein the equipment parameters include high-voltage incoming cable parameters, transformer-side low-voltage incoming frame circuit breaker and bus tie circuit breaker parameters, reactive capacitor compensation parameters and active filter device parameters.

[0008] Optionally, it also includes: According to the preset power supply plan, select the voltage level, high-voltage cabinet type and metering method of the substation to be designed from the high-voltage part setting page of the drawing assistant software; According to the reserved space of the preset project building, the transformer layout corresponding to the substation to be designed is determined.

[0009] Optionally, extracting a target number of outgoing line circuits and a target switch module of each transformer from the outgoing line circuit information, and calculating the number of outgoing line cabinets of the substation to be designed by using a preset outgoing line circuit reserve rate, a preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits, and the target switch module, includes: Extracting the initial number of outgoing line loops and the initial switch module of each transformer from the outgoing line loop information; Determine whether the initial number of outgoing line circuits and the initial switch module number are within a preset reasonable range for low-voltage outgoing line circuit allocation; If not, the initial number of outgoing line circuits and the initial switch modulus are adjusted to generate new initial number of outgoing line circuits and initial switch modulus, and the process jumps to the step of determining whether the initial number of outgoing line circuits and the initial switch modulus meet the preset reasonable range of low-voltage outgoing line circuit allocation; If yes, the initial number of outgoing line loops and the initial switch modulus are determined as the target number of outgoing line loops and the target switch modulus; The number of outgoing line cabinets of the substation to be designed is calculated using the preset outgoing line circuit reserve rate, the preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits and the target number of switches.

[0010] Optionally, allocating all outgoing line circuits of each transformer according to a preset allocation rule, and placing each outgoing line circuit and a spare circuit in an outgoing line cabinet of the substation to be designed according to the allocation result, includes: Classifying all outgoing line loops of each transformer according to different transformers to generate a plurality of outgoing line loops of the transformer; Arrange the outgoing cabinets of each load in the order of preset load levels; Arrange the load levels according to the switch setting value sorting rules of the outgoing line circuit, and place the loads corresponding to each load level in the corresponding outgoing line cabinet; Each of the outgoing line circuits and the standby circuit is placed in each of the outgoing line cabinets according to preset placement rules.

[0011] Optionally, the respectively verifying the load rate, the equipment parameters, the target number of outgoing line circuits, the target switch module, the preset outgoing line circuit standby rate, and the cabinet electrical system corresponding to the outgoing line cabinet, and generating a system construction drawing of the substation to be designed according to the verification results, includes: Verifying the load rate and equipment parameters of each transformer to generate a first verification result; Verifying the integrity of the outgoing line loops corresponding to the target number of outgoing line loops and the target switch module to generate a second verification result; Verifying the preset outgoing line loop standby rate to generate a third verification result; Calculating the sum of all set currents of the outgoing switches corresponding to the outgoing cabinet, and verifying the sum of all the set currents to generate a fourth verification result; Saving parameter information and / or setting information corresponding to the first verification result, the second verification result, the third verification result, and the fourth verification result respectively; A system construction drawing of the substation to be designed is generated based on the parameter information and / or the setting information data.

[0012] A second aspect of the present invention provides a substation design system, which is applied to drawing assistant software and includes: An acquisition module is used to obtain the outgoing line circuit information of the substation to be designed, and determine the transformer of each outgoing line circuit and the load rate of each transformer according to the outgoing line circuit information; An equipment parameter module, configured to determine equipment parameters suitable for each transformer based on each transformer and its load factor; an extraction module, configured to extract the target number of outgoing line circuits and the target switch modulus of each transformer from the outgoing line circuit information, and calculate the number of outgoing line cabinets of the substation to be designed by using a preset outgoing line circuit reserve rate, a preset low-voltage outgoing line cabinet modulus, the target number of outgoing line circuits and the target switch modulus; An allocation module is used to allocate all outgoing line circuits of each transformer according to a preset allocation rule, and place each outgoing line circuit and a spare circuit in an outgoing line cabinet of the substation to be designed according to the allocation result; The verification module is used to verify the load rate, the equipment parameters, the target number of outgoing line circuits, the target switch module, the preset outgoing line circuit backup rate and the cabinet electrical corresponding to the outgoing line cabinet, and generate the system construction drawing of the substation to be designed according to the verification results.

[0013] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the substation design method as described in any one of the above items.

[0014] A fourth aspect of the present invention provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer executes the substation design method as described above.

[0015] It can be seen from the above technical solutions that the present invention has the following advantages: The present invention first obtains the outgoing line loop information and calculates the load rate of the transformer; matches the equipment specifications based on the transformer parameters; calculates the number of outgoing line cabinets in combination with the preset spare rate, cabinet module and loop data; allocates the loop to the outgoing line cabinet according to the load level and current size rules and configures the spare loop; and finally generates the system construction drawing through multi-dimensional verification. Data-driven operation replaces manual operation throughout the process, realizing full process automation from information entry to drawing output. The present invention saves the designer the tedious work of manually checking hundreds of loop information by automatically calculating the load rate, matching equipment parameters, and allocating outgoing line loops, greatly shortening the design cycle that originally took several days; with the help of standardized data entry and automated verification, it avoids problems such as loop mismatch and parameter inconsistency caused by manual omissions, while ensuring the consistency of the primary system diagram and the ordering diagram, while improving design efficiency, significantly reducing the risk of project delays caused by time-consuming information verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A flowchart of a substation design method provided in accordance with the first embodiment of the present invention; Figure 2 A schematic diagram of an information list of outgoing line loop information provided in the first embodiment of the present invention; Figure 3 A page diagram for reading capacity and switch information provided in the first embodiment of the present invention; Figure 4 This is a diagram of the upper half of a page for reading capacity and switch information provided in the first embodiment of the present invention; Figure 5 A lower half page diagram of a read capacity and switch information provided in the first embodiment of the present invention; Figure 6 A page diagram selected for the first cabinet arrangement form provided in the first embodiment of the present invention; Figure 7 A page diagram selected for the second cabinet arrangement provided in the first embodiment of the present invention; Figure 8 A page diagram for selecting the third cabinet arrangement form provided in the first embodiment of the present invention; Figure 9 A page diagram for previewing a low-voltage outlet switch provided in the first embodiment of the present invention; Figure 10A partial page diagram of transformer outgoing line parameter indicators generated by an adjustment switch provided in the first embodiment of the present invention; Figure 11 A diagram of a partial page of error information prompts generated by an adjustment switch provided in the first embodiment of the present invention; Figure 12 A page diagram of a portion of an outlet cabinet generated by adjusting a switch provided in the first embodiment of the present invention; Figure 13 Another part of the page diagram of the outgoing line cabinet generated by adjusting the switch provided in the first embodiment of the present invention; Figure 14 This is a structural block diagram of a substation design system provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0018] The embodiments of the present invention provide a substation design method and system for solving the technical problem that the existing design process is highly dependent on manual operation, designers need to spend a lot of time in checking all power circuit information, resulting in low design efficiency.

[0019] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 13 , Figure 1 This is a flowchart of the steps of a substation design method provided in Example 1 of the present invention.

[0021] The present invention provides a substation design method, which is applied to drawing assistant software and includes: Step 101: Obtain outgoing line circuit information of the substation to be designed, and determine the transformer of each outgoing line circuit and the load rate of each transformer according to the outgoing line circuit information.

[0022] In the embodiment of the present invention, the substation to be designed refers to a user substation below 35 kV that needs to be designed.

[0023] Outgoing line circuit information refers to the detailed parameters of each power supply circuit drawn from the low-voltage side in the substation to be designed.

[0024] An outgoing circuit is a circuit path that originates from the low-voltage side of a substation and supplies power to specific electrical equipment or areas, such as basement lighting or a low-voltage electrical equipment room. Each outgoing circuit corresponds to an independent electrical load and requires control via a device such as a circuit breaker.

[0025] A transformer refers to the core equipment in a substation that converts high voltage electricity (such as 10kV, 20kV) into low voltage electricity (such as 0.4kV), providing power support for the outgoing line circuit.

[0026] The load rate of a transformer refers to the ratio of the actual load borne by the transformer to its rated capacity (the calculation formula can be simplified as: load rate = actual load ÷ rated capacity × 100%).

[0027] This invention standardizes the collection format of all power circuits in a substation design project using an Excel spreadsheet, assisting designers in determining the project's overall power consumption and effectively allocating loads to individual transformers. Based on this standardized spreadsheet, this user-defined substation drawing assistant software was developed on the ZWCAD platform (hereinafter referred to as CAD). It automatically generates core content, such as the primary system diagram and electrical ordering diagram, for a user's substation based on the standardized spreadsheet filled out by the designer.

[0028] The load statistical distribution table collects detailed information on all outgoing line circuits (such as equipment capacity, power factor, etc.). This is the basis for subsequent design. Based on the outgoing line circuit information, each circuit is assigned to a specific transformer (for example, the designer fills in which transformer is powered by each circuit) to ensure that the load is reasonably distributed among multiple transformers. During the distribution process, the load rate of each transformer is calculated and displayed in real time through the table to verify the rationality of the distribution plan (for example, to avoid excessively high load rates that lead to transformer overload, or excessively low load rates that lead to resource waste).

[0029] Furthermore, step 101 includes the following sub-steps: S11. Fill in the information of each outgoing line circuit in the load statistics distribution table according to the project requirements of the substation to be designed.

[0030] In this embodiment of the present invention, the load statistics and distribution table refers to a standardized spreadsheet tool designed on the Excel platform. It is used to centrally collect key information about all low-voltage outgoing line circuits in the substation to be designed, and automatically complete functions such as electrical parameter calculation and load distribution assistance. Its core function is to standardize the data collection format, simplify the designer's calculation work, and provide basic data support for subsequent substation equipment selection and blueprint drawing.

[0031] At the outset of a project, designers use the load distribution table (hereinafter referred to as the distribution table) included in the present invention to compile a statistical summary of all circuits in the project, as provided by the building electrical engineering department, that require power from the user's substation. Based on project requirements, the table accurately fills in information for each outgoing circuit, including circuit number, load name, equipment capacity (kW), demand coefficient, equipment power factor, and load level, to obtain information for each outgoing circuit.

[0032] S12. Calculate the calculated current of each outgoing line loop in the outgoing line loop information.

[0033] In this embodiment of the present invention, calculated current refers to the automatic calculation of outgoing line circuit information (such as equipment capacity, demand coefficient, and equipment power factor) entered in the load statistics and distribution table using the table's built-in formula. This serves as an important basis for designers to select the setting current of the corresponding substation's outgoing line switches and is directly related to the selection and safe operation of outgoing line circuit electrical equipment.

[0034] The allocation table automatically calculates the calculated current of each outgoing circuit (the current size of the circuit when it is in normal use under theoretical conditions).

[0035] S13. Based on the calculated current, select the set current of the outgoing line switch of the substation to be designed.

[0036] In the embodiment of the present invention, the set current refers to the rated operating current value set by the designer for the outgoing line switch (such as a low-voltage circuit breaker) of the substation to be designed based on the calculated current of the outgoing line circuit.

[0037] In the load statistics distribution table, after filling in the equipment capacity, required coefficient, power factor and other information of a certain outgoing line circuit, the table will automatically calculate the calculated current of the circuit based on these parameters. The designer will then determine the set current of the outgoing line switch of the circuit based on this calculated current to ensure the safety and rationality of the circuit operation.

[0038] S14. Generate circuit information of the substation to be designed using the circuit number, load name, equipment capacity, required coefficient, calculated current, and set current of each outgoing circuit.

[0039] In the embodiment of the present invention, see Figure 2 As shown, the system collects core information for each outgoing line circuit, including the circuit number (e.g., WLM1), load name (e.g., basement lighting B1-ZAL1), equipment capacity (kW), demand factor, calculated current, and the set current selected based on the calculated current. These parameters are systematically integrated to form comprehensive information that fully reflects the electrical characteristics of each outgoing line circuit in the substation to be designed. This circuit information serves as the foundation for subsequent transformer load allocation, equipment parameter matching, and the automatic generation of construction drawings such as primary system diagrams and electrical ordering drawings. It ensures data integrity and consistency throughout the design process, supporting the accuracy and efficiency of substation design.

[0040] S15. Determine the transformer corresponding to each outgoing line circuit and the load rate of the transformer according to the outgoing line circuit information.

[0041] In the embodiment of the present invention, after filling in all outgoing line circuits, the designer fills in which transformer supplies power to each circuit based on the calculated parameters.

[0042] During this process, designers can clearly determine the project's power capacity and the optimal number of transformers. The table also displays the current transformer load factor as designers assign the load of outgoing power circuits to specific transformers, providing a technical reference for subsequent assignments. Once all outgoing circuit information is filled in and all circuits are assigned to the appropriate transformers, the first part of the work is complete.

[0043] This step leverages the power of Excel itself, simplifying the designer's work by embedding formulas within the spreadsheet, eliminating the massive amount of calculations they previously had to do. This facilitates the designer's ability to determine the capacity of each power transformer and assists in assigning transformers to each circuit, laying the foundation for the subsequent accurate and efficient creation of key elements such as the primary system diagram and electrical ordering diagram for the user's substation.

[0044] Step 102: Based on each transformer and its load rate, determine equipment parameters suitable for each transformer.

[0045] In this embodiment of the present invention, equipment parameters refer to the technical specifications and performance indicators of various electrical equipment used with the transformer. These parameters must be determined based on the transformer's capacity, load factor, and relevant design specifications to ensure safe, economical, and reliable substation operation. Specific equipment parameters include: the model of the high-voltage incoming cable (e.g., ZRYJV22-8.7 / 15kV-3*120mm²), the setting parameters of the low-voltage incoming frame circuit breaker and bus tie circuit breaker (e.g., frame rated current, overload long-time delay current), the capacity of the reactive power compensation device (e.g., 480kVar), and the specifications of the active power filter (e.g., 250A).

[0046] First, based on the assigned transformer and its real-time load factor, the transformer's actual operating requirements (such as capacity and voltage level) are determined. Then, based on national and local standards (such as GB50053-2013 and DB32 / T3748-2020), combined with the power supply company's drawing review standards and project experience, the transformer is matched with the specific parameters of appropriate high-voltage incoming cables, circuit breakers, reactive power compensation devices, and other equipment. For example, a 1600kVA transformer requires a 3200A frame current circuit breaker and a 480kVar reactive power compensation device. This ensures that equipment parameters match the transformer's capacity and load factor, avoiding power supply failures or resource waste caused by parameter mismatches and providing an accurate basis for equipment selection in subsequent construction drawing design.

[0047] Furthermore, step 102 includes the following sub-steps: S21. Read the load statistics distribution table.

[0048] In the embodiment of the present invention, the "NETLOAD" command is used in CAD to load the user-defined drawing assistant software (hereinafter referred to as the drawing assistant), and the completed load statistical distribution table is read in the pop-up interface.

[0049] S22. Based on the load statistical distribution table and preset design requirements, select equipment parameters that are suitable for each transformer through each transformer and its load rate; among which, the equipment parameters include high-voltage incoming cable parameters, transformer-side low-voltage incoming frame circuit breaker and busbar circuit breaker parameters, reactive capacitor compensation parameters and active filter device parameters.

[0050] In the embodiment of the present invention, the preset design requirements refer to the requirements of various regulations and codes, as well as the power supply company's years of drawing review results and the staff's years of design experience.

[0051] High-voltage incoming cable parameters refer to the technical specifications of the cable connecting the power supply to the high-voltage side of the transformer. They are determined based on the rated current and voltage level of the transformer's high-voltage side, as well as the installation environment. These parameters include cable model (e.g., ZRYJV22, flame-retardant cross-linked polyethylene steel-tape armored cable), voltage level (e.g., 10kV corresponds to 8.7 / 15kV, 20kV corresponds to 18 / 24kV), and cross-sectional area (e.g., 3*120mm²). These specifications must meet short-circuit current withstand, overload capacity, and allowance for future expansion.

[0052] The parameters of the low-voltage incoming frame circuit breaker on the transformer side refer to the technical indicators of the circuit breaker connecting the low-voltage side of the transformer (0.4kV) and the low-voltage busbar, including the frame rated current, overload long-time delay current (Ir1), short-circuit short-time delay current (Ir2), short-circuit instantaneous current (Ir3), shunt function and voltage loss delay, etc., which must match the rated current and short-circuit current level of the low-voltage side of the transformer.

[0053] The bus tie circuit breaker parameters refer to the technical indicators of the circuit breaker connecting the low-voltage busbars of two transformers when dual power supply is used. The parameter requirements are consistent with the low-voltage incoming line frame circuit breaker and are used to ensure electrical communication between the two transformers and safe isolation in the event of a fault.

[0054] Reactive capacitor compensation parameters refer to the technical specifications of capacitor compensation devices used to compensate for reactive power in the power grid and improve the power factor. They mainly include compensation capacity (determined as 20%-30% of the transformer capacity, such as 480kVar for a 1600kVA transformer), functional characteristics (such as zero-crossing switching and phase compensation, with the phase compensation capacity being no less than 40% of the total capacity), and parameters of supporting filtering and inrush current suppression devices.

[0055] Active filter device parameters refer to the technical specifications of active filter equipment used to suppress grid harmonics and improve power quality. These include the device's rated current (e.g., 250A) and the busbar CT transformer ratio (e.g., 3000 / 5A). These specifications are determined based on the transformer capacity, the load's harmonic characteristics, and the user's power quality requirements.

[0056] The drawing assistant combines the requirements of various regulations, along with the power supply company's years of review results and the staff's design experience, to directly provide the required design parameters based on the transformer capacity, including specifications for the 0.4kV incoming line cabinet and busbar, reactive power compensation device parameters, active power filter device parameters, transformer dimensions, and 0.4kV busbar specifications. During the actual design process, designers should refer to the national standards GB50053-2013 <<Design Specifications for Substations 20kV and Below>>, GB50054-2011 <<Design Specifications for Low-Voltage Distribution Systems>>, GB50052-2009 <<Design Specifications for Power Supply and Distribution Systems>>, GB51348-2019 <<Design Standards for Electrical Equipment for Civil Buildings>>, and, in Jiangsu Province, the local standard DB32 / T3748-2020 <<Construction Standards for Substations 35kV and Below>>. Based on these standards, equipment of varying specifications should be matched to transformers of varying capacities to ensure safe, economical, and reliable power supply. The main equipment parameters are: 1. Parameters of high voltage incoming cable: According to the specification, the incoming cables in the substation are uniformly selected as ZRYJV22 (flame-retardant cross-linked polyethylene steel tape armored cable). Depending on the voltage level, 8.7 / 15kV is selected for the 10kV voltage level (rated insulation voltage to ground is 8.7kV, rated insulation voltage between phases is 15kV); 18 / 24kV is selected for the 20kV voltage level (rated insulation voltage to ground is 18kV, rated insulation voltage between phases is 24kV). The rated current calculation formula on the high-voltage side of the transformer is:

[0057] Where, S is the capacity of the transformer; U It is the voltage level on the high voltage side of the transformer.

[0058] Taking a 10kV dry-type transformer with a 1600kVA capacity as an example, the above formula calculates that the rated current on the transformer's high-voltage side is approximately 92.4A. Considering the possibility of short-term overloads and allowing for future user expansion, and after consulting the ZRYJV22 cable's product technical manual and combining the power supply company's years of review and the staff's extensive design experience, the drawing assistant ultimately selected the ZRYJV22-8.7 / 15kV-3*120mm² model for the 1600kVA transformer's high-voltage incoming cable.

[0059] 2. Parameters of the low-voltage incoming line frame circuit breaker and the bus tie circuit breaker (the circuit breaker for electrical connection between the two transformers in the case of dual power supply) on the 0.4kV side of the transformer: In the case of different transformer capacities, the rated current of the transformer on the low voltage side (0.4kV side) is still calculated first. The calculation formula is:

[0060] Where, S is the capacity of the transformer; U It is the voltage level on the high voltage side of the transformer.

[0061] Taking a 10kV dry-type transformer with a 1600kVA capacity as an example, the above formula calculates that the transformer's low-voltage side rated current is approximately 2309A. Based on the various parameters of frame circuit breakers from imported, joint venture, and domestic brands currently on the market, and in accordance with regulatory requirements and the power supply company's performance requirements for the circuit breaker's ultimate sectionalizing capability, the Drawing Assistant ultimately selected a four-phase frame circuit breaker with a motorized shunt function and a 3-second voltage loss delay for the low-voltage incoming line and bus tie circuit breakers on the 0.4kV side of the 1600kVA transformer. The frame rated current is 3200A, the overload long-time delay current Ir1 is 2500A, the short-circuit short-time delay current Ir2 is 16kA, the short-circuit instantaneous current Ir3 is 20kA, and the short-circuit instantaneous current is 20kA.

[0062] 3. Parameters of reactive capacitor compensation: National and local standards clearly stipulate that reactive power compensation equipment parameters for 10kV and 20kV substations can be determined as 20% to 30% of the transformer capacity. For example, for a 10kV dry-type transformer with a capacity of 1600kVA, the standard stipulates that the reactive power compensation device configured for this transformer should have a compensation capacity of 480kVA and include zero-crossing switching, split-phase compensation, harmonic suppression filters, and inrush current devices. The split-phase compensation capacity must not be less than 40% of the total compensation capacity.

[0063] 4. Parameters of active filter device: Some users have high power quality requirements or require precision equipment to eliminate multiple harmonic interference, so installing active power filters is necessary to further improve power quality. Drawing on years of design experience and feedback from numerous large and medium-sized projects, our staff has developed a comprehensive set of active power filter parameter settings for transformers of varying capacities. For example, for a 10kV dry-type transformer with a 1600kVA capacity, the active power filter should be set to 250A, and the busbar CT transformer ratio should be set to 3000 / 5A.

[0064] The above data, based on years of project experience, was compiled under strict compliance with national and regional (Jiangsu Province) standards and industry specifications for different transformer capacities. Staff embedded this data into a drawing assistant plug-in, eliminating the tedious process of calculating parameters and consulting regulatory standards when designing substations. This streamlined the process and eliminated the possibility of mismatches between device parameters and transformer capacity due to designer miscalculations.

[0065] Furthermore, the method further comprises the following sub-steps: S31. According to the preset power supply plan, select the voltage level, high-voltage cabinet type and metering method of the substation to be designed from the high-voltage part setting page of the drawing assistant software.

[0066] In the embodiment of the present invention, the preset power supply plan refers to the "Power Supply Plan Reply Sheet" document of the power supply company.

[0067] Voltage level refers to the voltage standard for the power supply connected to the substation being designed. It is the power system voltage level determined by the Power Supply Plan Response Sheet approved by the power supply company. This includes two voltage levels: 10 kV and 20 kV. These levels directly impact design factors such as high-voltage incoming cable parameters and equipment insulation ratings. For example, a 10 kV voltage level corresponds to an 8.7 / 15 kV high-voltage incoming cable insulation standard.

[0068] High-voltage cabinet type refers to the cabinet structure used to receive and distribute electrical energy on the high-voltage side of a substation. Selection should be based on project power consumption, regulatory requirements, and equipment cost. The types mentioned in this article include ring main cabinets (suitable for projects with standard capacity), center cabinets (suitable for larger capacity projects), and central station direct connection (suitable for projects with extremely high power consumption and integrated with the user power supply central station). These different types vary in their ultimate breaking capacity and structural complexity.

[0069] Metering refers to the way the power supply company measures and charges for electricity used in a substation, primarily reflecting the location of the meter. This method is categorized as either metered (meters are placed within the substation to be designed) or unmetered (meters are not located within the substation). This method is determined based on the Power Supply Plan Response and the project's specific circumstances.

[0070] After configuring the transformer capacity of the user's substation and the parameters of the corresponding electrical equipment according to the information in the load statistics distribution table, enter the relevant settings for the power supply access of the user's substation. After the construction party applies for electricity, the power supply company will approve the power source of the user's substation based on the power demand provided by the construction party and the existing power supply conditions in the surrounding area. Usually, the power supply company will explain the power supply approved by the power supply company in response to the power supply application submitted by the user in the form of a "Power Supply Plan Reply Form". This mainly includes the voltage level of the power supply (10 kV / 20 kV) and the access point of the power supply (such as a large substation near the power consumption area). The "Power Supply Plan Reply Form" also clarifies how the power supply company will meter and charge for the user's substation.

[0071] After setting up steps 101 and 102, the designer needs to select the voltage level of the substation as 10 kV or 20 kV in the "High Voltage Part Settings" area of ​​the drawing assistant software interface ① according to the "Power Supply Plan Reply Form" approved by the power supply company. In terms of the high-voltage incoming line cabinet setting, if the electricity consumption of this project is very large, it is necessary to set up a separate user power supply center station and the user substation is designed to be built together with the user power supply center station, then select the "Direct connection to the center station" option. Otherwise, according to the capacity of the transformer, in accordance with the specifications and the requirements of the power supply company, after fully considering the difference in the ultimate breaking capacity of the high-voltage receiving cabinet and the equipment cost and other factors, the designer decides whether to choose a "ring network cabinet" or a "center cabinet" for the high-voltage receiving part. Finally, based on the "Power Supply Plan Reply Form" and the basic situation of the project, decide whether the power supply company's metering meters are placed in the user substation, that is, whether the user substation designed this time has the power supply company's metering. Refer to Figure 3 and Figure 5 shown.

[0072] S32. Determine the transformer layout corresponding to the substation to be designed according to the reserved space of the preset project building.

[0073] In this embodiment of the present invention, the pre-set project building reserved space refers to the physical installation area planned in advance by the architectural professionals for the substation to be designed, including spatial conditions such as the room's width, length, and layout. This invention emphasizes that this is a key factor in determining the transformer layout; for example, a narrow and long room requires a specific arrangement.

[0074] Transformer layout refers to the spatial arrangement of transformers and supporting electrical devices within a substation. This invention provides three preset layouts: 2 transformers arranged in 2 rows: Suitable for wide rooms, transformers are arranged face to face, and the bus duct is at the end of the low-voltage cabinet; Two transformers arranged in one row: suitable for narrow and long rooms, arranged in the same row according to the specifications; 2 transformers are arranged in 2 rows (busbar connection at the front): Similar to the first type, but the busbar connection cabinet is placed in front to facilitate the addition of outgoing line circuits in the future.

[0075] After step S31, the designer needs to consult the project's architectural and structural drawings and determine the layout of the transformer and other electrical devices in the user's substation based on the room conditions reserved for the user's substation by the architectural design department. Based on the staff's many years of design experience and the vast number of substation projects that have been put into operation, the drawing assistant software currently provides three layout types: 1) Two transformers are arranged in two rows This layout is the most commonly used layout, suitable for reserved spaces with a relatively large room width. Two transformers can be arranged face to face, and the bus duct for dual power connection is at the end of the low-voltage cabinet. Figure 6 .

[0076] 2) Two transformers are arranged in the same row This type of layout exists in some narrow and long rooms. In order to improve the utilization of space, the architectural profession reserves a narrower user substation room during design. According to the provisions of the "Civil Building Electrical Design Standard" on the layout of substations, two transformers can only be arranged in the same row. Figure 7 .

[0077] 3) Two transformers are arranged in two rows The transformer and low-voltage incoming line cabinet and capacitor compensation cabinet in this arrangement are the same as those in the first arrangement. The difference is that the 0.4kV busbar interconnection cabinet is placed in advance. This is particularly convenient for adding outgoing line circuits after the user's substation is completed. This arrangement is suitable for situations where there is a high possibility of changes in future electricity consumption (such as when a shopping mall suddenly attracts merchants and needs to add power supply circuits). Figure 8 .

[0078] At this point, the designer, using Drawing Assistant software, has already determined the high-voltage section of the customer's substation, the transformer and its supporting equipment, and their layout by simply reading the load distribution table and referring to the "Power Supply Plan Response Sheet" approved by the power supply company. Without Drawing Assistant software, the designer would have to frequently calculate and record various parameters. Using Drawing Assistant software greatly improves design efficiency and accuracy, allowing the designer to focus more on verifying key data and making the correct settings based on the "Power Supply Plan Response Sheet."

[0079] Step 103: Extract the target number of outgoing line circuits and the target switch module of each transformer from the outgoing line circuit information, and calculate the number of outgoing line cabinets of the substation to be designed using the preset outgoing line circuit reserve rate, the preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits and the target switch module.

[0080] In the embodiment of the present invention, the target number of outgoing line circuits refers to the total number of all outgoing line circuits in the substation to be designed, and is a basic count for classifying and managing each circuit.

[0081] The target switch module refers to the unit of space occupied by the switch, determined based on the rated current and physical dimensions of the outgoing cabinet (for example, in an MNS cabinet, 1 module corresponds to a certain space dimension). This is used to plan the arrangement of switches in the cabinet.

[0082] The preset outgoing line circuit reserve rate refers to the capacity ratio reserved for the circuit to cope with future load growth. The reserve rate in the present invention is 20%, ensuring that there is room for expansion of switches and cabinets.

[0083] The preset module of the low-voltage outlet cabinet refers to the standard space unit of the cabinet. The 9 modules of the MNS cabinet in the present invention means that each cabinet can accommodate switches of 9 modules.

[0084] The number of outgoing line cabinets refers to the total number of required outgoing line cabinets calculated based on the switch modules, standby rate and cabinet modules of each circuit (for example, a transformer fire load circuit in a certain project has 8 circuits, and the corresponding switches for the 8 circuits require 12 modules. After summarizing multiple circuits, it is calculated as 9 modules per cabinet, and 2 cabinets are required).

[0085] By integrating key circuit parameters (such as calculated current and set current) and cabinet design standards (such as module and reserve rate), the system generates a distribution cabinet configuration plan that meets capacity matching, reasonable space, and reserved expansion requirements, providing data support for subsequent construction drawing drawing.

[0086] Furthermore, step 103 includes the following sub-steps: S41. Extracting the initial number of outgoing line loops and the initial switch module number of each transformer from the outgoing line loop information.

[0087] In the embodiment of the present invention, the initial number of outgoing line circuits refers to the total number of outgoing line circuits calculated at the initial design stage based on the core parameters of each outgoing line circuit of the substation to be designed (such as circuit number, calculated current, etc.), which is the basic data reflecting the scale of the substation power supply circuit.

[0088] The initial switch module refers to the initial occupied space unit set for the substation outgoing line switch based on the rated current of each outgoing line circuit and the parameters of the high-voltage incoming line and low-voltage equipment. It is a key indicator for measuring the physical size of the switch and the cabinet layout.

[0089] After completing the basic settings in steps 101 and 102, click the "Save Plan" button in the drawing assistant software to enter the "② Preview Low-Voltage Outgoing Switch" interface. In this interface, the drawing assistant software first reads all outgoing circuits from the load statistics distribution table and displays them in a table format. The table details the outgoing circuit number, load name, equipment capacity (kW), load level, and assigned transformer serial number (the background color for transformer 1's load is red, and the background color for transformer 2's load is yellow).

[0090] To give designers a more intuitive understanding of each power circuit, the drawing assistant software provides a "filter by condition" function, which can query circuits that meet the requirements based on the load level or filter based on the different transformers. At the same time, the "Low-voltage Outgoing Circuit Statistics Table" in the software is in the form of a table. According to the two filtering criteria of the number of outgoing circuits (i.e., the initial number of outgoing circuits) and the number of outgoing switch modules (i.e., the initial number of switch modules) according to different load levels, the power supply status of each transformer is displayed in two tables respectively. This informs the designer whether the number of outgoing circuits set in the current load statistical distribution table is balanced. It also analyzes whether the distribution of each power circuit in the load statistical distribution table is reasonable from the perspective of quantity and the physical size of the switches. It also provides a data basis for the next step of automatically allocating outgoing circuits.

[0091] S42. Determine whether the initial number of outgoing line circuits and the initial switch module number conform to a preset reasonable range for low-voltage outgoing line circuit allocation.

[0092] In the embodiment of the present invention, see Figure 9As shown, the low-voltage outgoing line circuit statistics in the upper right corner show that Transformer 1 provides 19 circuits, including 6 fire load circuits, 6 secondary load circuits, and 7 tertiary load circuits; while Transformer 2 provides 20 circuits, including 6 fire load circuits, 6 secondary load circuits, and 8 tertiary load circuits. The design is generally balanced in terms of the number of circuits. Analyzing the number of switch modules (the amount of physical space occupied by switches), Transformer 1's low-voltage outgoing line switches require a total of 34 modules, including 9 for fire load circuits, 7 for secondary load circuits, and 18 for tertiary load circuits; while Transformer 2's low-voltage outgoing line switches require a total of 35 modules, including 9 for fire load circuits, 7 for secondary load circuits, and 19 for tertiary load circuits. These statistics indicate that the number of low-voltage outgoing line switches on the low-voltage busbars of the two transformers is similar in physical space. Combined with the transformer load factor calculations in the load distribution table, designers can quickly determine whether the distribution of the numerous low-voltage outgoing line circuits is appropriate. This also provides designers with a powerful criterion, solving the problem that has troubled designers for a long time: how to judge whether a large number of outgoing line circuits are reasonably and balancedly distributed to two different transformers.

[0093] If not, the initial number of outgoing line circuits and the initial switch modulus are adjusted to generate new initial number of outgoing line circuits and initial switch modulus, and the process jumps to the step of determining whether the initial number of outgoing line circuits and the initial switch modulus meet the preset reasonable range of low-voltage outgoing line circuit allocation.

[0094] In an embodiment of the present invention, according to two data statistics, namely the number of circuits and the module of switches, it is shown that the number of low-voltage outgoing line cabinets on the low-voltage side busbars of two transformers in physical space is similar. Combined with the relevant calculation of the transformer load rate in the load statistical distribution table, the designer can quickly determine whether the distribution of the numerous low-voltage outgoing line circuits is reasonable. If not, the initial number of outgoing line circuits and the initial module of switches can be adjusted. The new number of outgoing line circuits and the module of switches can be used to further determine whether the distribution of the numerous low-voltage outgoing line circuits is reasonable.

[0095] S44: If yes, the initial number of outgoing line loops and the initial switch modulus are determined as the target number of outgoing line loops and the target switch modulus.

[0096] In an embodiment of the present invention, according to two statistical data, namely the number of circuits and the module of switches, it is shown that the number of low-voltage outgoing line cabinets on the low-voltage side busbars of two transformers in physical space is similar. Combined with the relevant calculation of the transformer load rate in the load statistical distribution table, the designer can quickly determine whether the distribution of numerous low-voltage outgoing line circuits is reasonable. If reasonable, the initial number of outgoing line circuits and the initial module of switches are respectively determined as the target number of outgoing line circuits and the target module of switches.

[0097] S45. Calculate the number of outgoing line cabinets of the substation to be designed using the preset outgoing line circuit reserve rate, the preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits, and the target number of switch modules.

[0098] In this embodiment of the present invention, by step S44, the designer has already completed the configuration and verification of all key design points for the user substation being designed using the various software functions provided by the drawing assistant. The next step is to use the drawing assistant software to automatically allocate the numerous outgoing line circuits. The following details the judgment logic of the drawing assistant software: First of all, according to the requirements of the power supply company, the backup rate of the low-voltage outgoing line circuit needs to reach 20%.

[0099] Secondly, the type of low-voltage outlet cabinet currently used on a large scale in design is the MNS cabinet. This type of cabinet has a total of 9 modules from top to bottom, which can accommodate various low-voltage outlet frame circuit breakers / drawer cabinet switches. Of course, if the project uses other types of cabinets, resulting in a maximum of 9 switch modules that can be set per cabinet, the designer can manually modify the data according to the actual situation.

[0100] Then, the designer can click on "estimate the number of outgoing line cabinets", and the drawing assistant will calculate the number of low-voltage outgoing line cabinets required for the transformer to place outgoing line switches according to the different load levels of each transformer and the set reserve rate. Figure 9 For example, in Figure 9 As can be seen in the figure, transformer 1's low-voltage outgoing line switches require a total of 34 modules, including 9 modules for the fire load circuit, 7 modules for the secondary load circuit, and 18 modules for the tertiary load circuit. Transformer 2's low-voltage outgoing line switches require a total of 35 modules, including 9 modules for the fire load circuit, 7 modules for the secondary load circuit, and 19 modules for the tertiary load circuit. Taking transformer 1 as an example, its fire load requires 9 modules of space for the switches. Considering a 20% reserve ratio, the final space required for transformer 1's fire load is 9 * (1 + 20%) = 10.8 ≈ 11 modules. A single MNS outgoing line cabinet only has 9 modules available. Therefore, the drawing assistant determines and recommends that two MNS outgoing line cabinets be used to house the outgoing line switches for transformer 1's fire load. Similarly, for other cases, the number of outgoing line cabinets required for all loads in this user's substation can be calculated. Figure 9 The table shows that the user's substation requires a total of 12 outgoing line cabinets, of which transformer 1 and transformer 2 each require 6 low-voltage outgoing line cabinets with a placement space of 9 modules.

[0101] Step 104: Allocate all outgoing line circuits of each transformer according to a preset allocation rule, and place each outgoing line circuit and a spare circuit in an outgoing line cabinet of the substation to be designed according to the allocation result.

[0102] In the embodiment of the present invention, the standby circuit refers to a circuit reserved for the substation to be designed, which is not directly allocated to the current outgoing line circuit but can be used for future expansion or temporary increase of load. Its parameters (such as calculated current and set current) must reserve margin according to the specifications.

[0103] The outlet cabinet refers to the cabinet used to install high-voltage incoming cables, low-voltage circuit breakers and other equipment. It is the physical carrier that centrally accommodates and protects low-voltage incoming frame circuit breakers, busbar circuit breakers and other devices.

[0104] During the design process of a substation, designers assign all outgoing circuits to different outgoing cabinets based on pre-set allocation rules (such as load balancing and regulatory requirements). They also incorporate each circuit's backup circuit (such as a reserved expansion circuit) into the overall layout, ultimately completing the matching configuration between the outgoing cabinets and the circuits. Specifically, the outgoing cabinet to which each outgoing circuit belongs is first determined according to the allocation rules. Backup circuits (for future expansion or temporary power supply) are then incorporated into the layout to ensure that all circuits match the outgoing cabinets, laying the foundation for subsequent generation of circuit information and drawing of construction drawings. This step, through standardized allocation logic, avoids the confusion of manual allocation, ensures a clear correspondence between the substation's outgoing cabinets and circuits, and ensures a reasonable layout, thereby improving design efficiency and accuracy.

[0105] Furthermore, step 104 includes the following sub-steps: S51. Classify all outgoing line loops of each transformer according to different transformers to generate multiple outgoing line loops of the transformers.

[0106] In this embodiment of the present invention, after determining the number of outgoing line cabinets, the designer clicks the "Customize Outgoing Line Circuit Arrangement" button. The drawing assistant software automatically assigns the load levels to the outgoing line cabinets and displays the detailed assignment results on the "③ Adjust Switches and Generate CAD" page. This step greatly reduces the designer's workload. The following is a brief working logic of the drawing assistant: First, all outgoing line circuits are separated by transformer type, and then strictly differentiated by load level. That is, outgoing line circuits with the same transformer and the same load level are counted together. The subsequent allocation is based on load level as the main differentiation point.

[0107] S52. Arrange the outgoing line cabinets where the loads are located according to the preset load level sequence.

[0108] In the embodiment of the present invention, the preset load level order refers to the order of fire load>special level 1 load>level 1 load>level 2 load>level 3 load.

[0109] The switches in the low-voltage distribution cabinet are arranged in the order of fire load > special first-level load > first-level load > second-level load > third-level load. That is, the distribution cabinet where the fire load is concentrated is closest to the transformer, followed by the distribution cabinet where the special first-level load is concentrated, and so on.

[0110] S53. Arrange the load levels according to the switch setting value sorting rules of the outgoing line circuit, and place the loads corresponding to each load level in the corresponding outgoing line cabinet.

[0111] In the embodiment of the present invention, the switch setting value sorting rule refers to sorting the switch setting values ​​from large to small.

[0112] For a single load level, first place the frame switch with the largest outgoing current in the first cabinet (if such a circuit exists), and then evenly arrange them in the corresponding outgoing cabinets from large to small according to the switch setting value of the outgoing circuit.

[0113] S54. Place each outgoing line circuit and standby circuit in each outgoing line cabinet according to preset placement rules.

[0114] In this embodiment of the present invention, by step S53, the drawing assistant has automatically allocated all outgoing line circuits to corresponding outgoing line cabinets according to different load levels. At this time, the designer can manually add a spare outgoing line cabinet or click the "Add Spare" button to automatically add the corresponding spare switch. After adding the spare switch, the drawing assistant will inform the designer in the form of a table whether all low-voltage switches have been placed and whether the number of spare switches in the current plan meets the 20% requirement.

[0115] After all outgoing and backup circuits are arranged into the low-voltage outgoing cabinet according to the rules, the drawing assistant software provides an automatic switch sorting function to make the switch arrangement from top to bottom on each outgoing cabinet more reasonable. The basic logic is: from top to bottom - large frame circuit breaker > small frame circuit breaker > 100A-250A molded case switch > 400A molded case switch.

[0116] Steps S51 to S54 are illustrated by way of example: Figures 10 to 13 The state after the above drawing assistant software has assigned all outgoing switches and added spare circuits. First, the transformer 1 outgoing parameter index table and the transformer 2 outgoing parameter index table in the upper left corner count the detailed data of the number of outgoing circuits in the current design scheme. The "outgoing circuit number" in the second column indicates the number of circuits that meet the screening requirements counted in the load distribution table, and the "number of switches placed" in the third column indicates that the drawing assistant software has automatically assigned this number of outgoing circuits. Figure 12 and Figure 13The identical data in the second and third columns confirms that all circuits have been routed. The fourth and fifth columns, however, show the number of backup switches deployed, ultimately calculating the backup rate of outgoing line switches, providing a reference for designers. After steps S51-S54, the switches in outgoing cabinet 5 (level 3 load) are arranged from top to bottom as follows: 400A molded case switch - 630A frame switch (backup switch) - 400A molded case switch (backup switch) - 160A molded case switch (backup switch). This arrangement is clearly unreasonable. Clicking the sort button changes it to: 630A frame switch (backup switch) - 160A molded case switch (backup switch) - 400A molded case switch - 400A molded case switch (backup switch). This revised arrangement more rationally places frame switches requiring busbar duct outlets at the top and switches with larger, heavier cables at the bottom. In this way, all low-voltage outgoing circuits and backup circuits can be reasonably arranged in each outgoing circuit cabinet through simple button operation, which greatly saves the designer's time and energy, and also prevents the possibility of some errors.

[0117] Step 105: Verify the load rate, equipment parameters, target number of outgoing line circuits, target switch module, preset outgoing line circuit backup rate and the cabinet electrical system corresponding to the outgoing line cabinet, and generate a system construction drawing of the substation to be designed based on the verification results.

[0118] In the embodiment of the present invention, the verification result refers to the result of respectively verifying the load rate, equipment parameters, target number of outgoing line circuits, target switch module, preset outgoing line circuit spare rate and the cabinet electrical system corresponding to the outgoing line cabinet.

[0119] The verification and confirmation phase before generating system construction drawings in substation design involves individually verifying the transformer load factor, various equipment parameters (such as high-voltage incoming cables and circuit breakers), the target total number of outgoing line circuits, the switch module, the preset outgoing line circuit reserve ratio, and cabinet electrical characteristics (such as the ultimate breaking capacity). This ensures that each parameter complies with power supply specifications, matches the calculated current / rated current, and meets project safety requirements. Based on the verification results, the system construction drawings for the substation to be designed are generated. This step, through multi-dimensional parameter verification, ensures the consistency of the construction drawings with the actual load, equipment characteristics, and regulatory requirements. It is a key step in connecting circuit information with the final construction drawings, providing a compliance foundation for the subsequent automatic generation of primary system diagrams and electrical ordering drawings.

[0120] Furthermore, step 105 includes the following sub-steps: S61. Verify the load rate and equipment parameters of each transformer to generate a first verification result.

[0121] In the embodiment of the present invention, the first verification result refers to the result of verifying the load rate and equipment parameters of each transformer.

[0122] For designers, the correctness of the design is always the top priority. As an auxiliary drawing tool for 35kV user substations, the drawing assistant software also has a very strict self-examination and verification process for the correctness of the generated drawings. After the user completes the above operations, there is a "Verify" button in the "③ Adjust switch to generate CAD" interface. Clicking it will verify the correctness of various data for the entire project. Only after the drawing assistant has completed the self-check and there are no problems will it be allowed to save the plan and directly generate a system diagram, system order diagram, and typical floor plan diagram in CAD. The content of the self-verification is as follows: Verification of transformer capacity and supporting parameters: First, return to the original data source, the load statistics distribution table, to re-determine the transformer capacity, and then re-calibrate its supporting parameters based on the transformer capacity. During the design process, these parameters are automatically matched and set by the drawing assistant after reading the transformer capacity. However, to prevent special situations such as the designer's manual modification errors during the process, the drawing assistant will re-compare the following during the final verification: the parameters of the high-voltage incoming cable, the setting parameters of the low-voltage incoming frame circuit breaker and the busbar circuit breaker on the 0.4kV side of the transformer, the parameters of the reactive capacitor compensation, and the parameters of the active filter device. If any parameters are unsuitable, they will be displayed in the error message prompt table on the interface, and a pop-up window will warn the designer to pay attention to such issues. Ultimately, the designer will decide whether to design according to the commonly used data or stick to the parameters in the current plan due to the special circumstances of this project.

[0123] S62: Verify the integrity of the outgoing line loops corresponding to the target number of outgoing line loops and the target switch module, and generate a second verification result.

[0124] In the embodiment of the present invention, the integrity of the outgoing line loop refers to the consistency of the actual configuration (quantity, connection relationship, functional status, etc.) of the target outgoing line loop with the design requirements or preset standards, and whether the loop itself has complete and effective working conditions.

[0125] The second verification result refers to the result of verifying the integrity of the outgoing line circuits corresponding to the target number of outgoing line circuits and the target switch module.

[0126] Integrity check of outgoing line circuit: Verify that all low-voltage outgoing line switches in the plan are correctly arranged. First, compare all outgoing line switches in the plan with the data in the load statistics distribution table, confirming that all outgoing line circuits in the load statistics distribution table are arranged in the plan without missing items. Secondly, all outgoing circuits have been assigned to transformer 1 or transformer 2 in the load statistics distribution table. The drawing assistant reads the outgoing circuit allocation in the final plan and compares it with the data source to prevent mistakes such as a circuit that is clearly set to supply power to transformer 1 but is changed to supply power to transformer 2 due to improper operation, thereby ensuring that the load rate of the transformers is relatively balanced. After the above checks, the drawing assistant will also compare all the circuits powered by transformer 1 and transformer 2. This can filter out duplicate planning situations such as a certain outgoing line circuit being powered by both transformer 1 and transformer 2. Finally, after layers of verification, if there is a problem, it will be displayed in the error message prompt table on the interface. In order to help designers find the circuit where the problem occurs, the first column of the table shows the error type, whether it is a missing switch, a misplaced switch, or a duplicate switch. The error description will tell the designer which side of the outlet cabinet has the serial number of the switch that has the problem.

[0127] S63: Verify the preset outgoing line circuit standby rate to generate a third verification result.

[0128] In the embodiment of the present invention, the third verification result refers to the result of verifying the preset outgoing line loop standby rate.

[0129] Reserve rate verification: This primarily verifies that the backup ratio in the plan meets the set requirement of 20%. Because specific switch backup ratio requirements vary slightly among power supply companies, the drawing assistant calculates the backup ratio based on the switch frame current (specifically, 1-mode, 2-mode, or 4-mode), then calculates the total backup ratio for the backup switches in the plan. If the backup ratio for a switch with a specific frame current falls below the set value, the drawing assistant will notify the designer in an error message table.

[0130] S64. Calculate the sum of all set currents of the outgoing switches corresponding to the outgoing cabinet, and verify the sum of all set currents to generate a fourth verification result.

[0131] In the embodiments of the present invention, cabinet electrical refers to the overall electrical system characteristics of the substation to be designed, which are composed of the parameters and connection relationships of the outgoing line cabinet (such as low-voltage switchgear) and various electrical components inside it (such as circuit breakers, compensation devices, etc.). It is a comprehensive electrical property that reflects the operating status, protection logic and functional matching of the cabinet and its internal components.

[0132] The sum of all set currents of the outgoing switches installed in a low-voltage outgoing cabinet.

[0133] The fourth verification result refers to the result of verifying the sum of all set currents of the outgoing cabinet.

[0134] check: The drawing assistant also performs electrical verification of the switch layout in the proposed plan. Due to the limited longitudinal busbar width of a single low-voltage outgoing distribution panel (commonly known as the MNS panel), some manufacturers cannot manufacture switches with a total rated current exceeding 2000A. This is also a design consideration. The drawing assistant will report an error if such a situation occurs, prompting the designer to address and modify the design. Therefore, the total rated current of the outgoing switches must be less than the total current carrying capacity of the panel's physical busbars.

[0135] S65. Save the parameter information and / or setting information corresponding to the first verification result, the second verification result, the third verification result, and the fourth verification result, respectively.

[0136] In an embodiment of the present invention, after clicking the "Verify" button, the drawing assistant software performs a self-test. If there are no problems with the first verification result, the second verification result, the third verification result, and the fourth verification result, the self-test has all passed, and the "Save" button will be in a clickable state. After clicking the "Save" button, the drawing assistant saves all parameters and setting information, and the drawing button on the page becomes clickable.

[0137] S66. Generate a system construction drawing of the substation to be designed based on the parameter information and / or the setting information data.

[0138] In the embodiment of the present invention, the system construction drawing refers to a professional engineering drawing drawn based on the core parameter information of the substation (such as voltage level, capacity, load characteristics, etc.) and specific setting information (such as equipment selection, layout planning, wiring method, etc.) to guide the construction of the substation, equipment installation and system debugging.

[0139] Clicking the "Draw System Diagram" button will directly generate the construction drawing of the primary system diagram of the project in CAD, including the high-voltage incoming line part, the transformer part, and the low-voltage outgoing line part. Clicking the "Draw Ordering Diagram" button will directly generate the 0.4kV equipment arrangement ordering diagram of the project in CAD, in which the arrangement of the ordering diagram of the outgoing line cabinet part is strictly consistent with all the circuits in the system diagram. Clicking the "Draw Plan" button will generate a typical substation plan layout in CAD as a reference for designers. At this point, the entire drawing assistant assists designers in drawing user substations.

[0140] See also Figure 14 , Figure 14 This is a structural block diagram of a substation design system provided in Example 2 of the present invention.

[0141] The present invention provides a substation design system, which is applied to drawing assistant software and includes: The acquisition module 201 is used to obtain the outgoing line circuit information of the substation to be designed, and determine the transformers of each outgoing line circuit and the load rate of each transformer according to the outgoing line circuit information; The device parameter module 202 is used to determine the device parameters suitable for each transformer based on each transformer and the load rate of each transformer; Extraction module 203, for extracting the target number of outgoing line circuits and target switch modulus of each transformer from the outgoing line circuit information, and calculating the number of outgoing line cabinets of the substation to be designed using the preset outgoing line circuit reserve rate, the preset low-voltage outgoing line cabinet modulus, the target number of outgoing line circuits and the target switch modulus; The allocation module 204 is used to allocate all outgoing line circuits of each transformer according to a preset allocation rule, and place each outgoing line circuit and spare circuit in the outgoing line cabinet of the substation to be designed according to the allocation result; Verification module 205 is used to verify the load rate, equipment parameters, target number of outgoing line circuits, target switch module, preset outgoing line circuit backup rate and cabinet electrical corresponding to the outgoing line cabinet, and generate a system construction drawing of the substation to be designed based on the verification results.

[0142] Furthermore, the acquisition module 201 includes: The filling submodule is used to fill in the information of each outgoing line circuit in the load statistical distribution table according to the project requirements of the substation to be designed; The current calculation submodule is used to calculate the calculated current of each outgoing line loop in the outgoing line loop information; The selection submodule is used to select the setting current of the outgoing line switch of the substation to be designed according to the calculated current; The circuit information submodule is used to generate the circuit information of the substation to be designed by using the circuit number, load name, equipment capacity, required coefficient, calculated current and set current of each outgoing circuit; The load rate submodule is used to determine the transformer corresponding to each outgoing line circuit and the load rate of the transformer based on the outgoing line circuit information.

[0143] Furthermore, the device parameter module 202 includes: Reading submodule, used to read the load statistics distribution table; The equipment parameter submodule is used to select equipment parameters that are suitable for each transformer based on the load statistical distribution table and preset design requirements, through each transformer and its load rate. Among them, the equipment parameters include high-voltage incoming cable parameters, transformer-side low-voltage incoming frame circuit breaker and bus tie circuit breaker parameters, reactive capacitor compensation parameters, and active filter device parameters.

[0144] Furthermore, the system also includes: The selection submodule is used to select the voltage level, high-voltage cabinet type and metering method of the substation to be designed from the high-voltage part setting page of the drawing assistant software according to the preset power supply plan; The layout submodule is used to determine the transformer layout corresponding to the substation to be designed according to the preset project building reserved space.

[0145] Furthermore, the extraction module 203 includes: An extraction submodule is used to extract the initial number of outgoing line circuits and the initial switch module number of each transformer from the outgoing line circuit information; A judgment submodule is used to judge whether the number of initial outgoing line circuits and the initial switch module are in compliance with the preset reasonable range of low-voltage outgoing line circuit allocation; an adjustment submodule for adjusting the initial number of outgoing line circuits and the initial switch modulus if no, generating a new initial number of outgoing line circuits and the initial switch modulus, and jumping to the step of determining whether the initial number of outgoing line circuits and the initial switch modulus meet the preset reasonable range of low-voltage outgoing line circuit allocation; a switch modulus submodule, configured to, if yes, determine the initial number of outgoing line loops and the initial switch modulus as the target number of outgoing line loops and the target switch modulus; The outgoing line cabinet quantity submodule is used to calculate the number of outgoing line cabinets of the substation to be designed by using the preset outgoing line circuit reserve rate, the preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits and the target switch module.

[0146] Furthermore, the allocation module 204 includes: The classification submodule is used to classify all outgoing line loops of each transformer according to different transformers and generate outgoing line loops of multiple transformers; The arrangement submodule is used to arrange the outgoing cabinets of each load according to the preset load level sequence; The placement submodule is used to arrange the load levels according to the switch setting value sorting rules of the outgoing circuit, and place the loads corresponding to each load level in the corresponding outgoing cabinet; The outgoing line cabinet module is used to place each outgoing line circuit and spare circuit in each outgoing line cabinet according to preset placement rules.

[0147] Furthermore, the verification module 205 includes: A first verification submodule is used to verify the load rate and equipment parameters of each transformer and generate a first verification result; A second verification submodule is used to verify the integrity of the outgoing line circuits corresponding to the target number of outgoing line circuits and the target switch module, and generate a second verification result; A third verification submodule is used to verify the preset outgoing line loop standby rate and generate a third verification result; a calculation submodule, configured to calculate the sum of all set currents of the outgoing switches corresponding to the outgoing cabinet, and verify the sum of all set currents to generate a fourth verification result; A saving submodule, configured to save parameter information and / or setting information corresponding to the first verification result, the second verification result, the third verification result, and the fourth verification result, respectively; The construction drawing submodule is used to generate a system construction drawing of the substation to be designed based on parameter information and / or setting information data.

[0148] A third embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, the substation design method according to any embodiment of the present invention is implemented.

[0149] A fourth embodiment of the present invention provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer executes the substation design method as described in any embodiment of the present invention.

[0150] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0151] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0152] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0153] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0154] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0155] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A substation design method, characterized in that: Applicable to drawing assistant software, including: Obtaining outgoing line circuit information of the substation to be designed, and determining the transformers of each outgoing line circuit and the load rate of each transformer according to the outgoing line circuit information; Determining equipment parameters suitable for each transformer based on each transformer and its load rate; Extracting the target number of outgoing line circuits and the target switch module of each transformer from the outgoing line circuit information, and calculating the number of outgoing line cabinets of the substation to be designed by using a preset outgoing line circuit reserve rate, a preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits and the target switch module; Allocating all outgoing line circuits of each transformer according to a preset allocation rule, and placing each outgoing line circuit and a spare circuit in an outgoing line cabinet of the substation to be designed according to the allocation result; The load rate, the equipment parameters, the target number of outgoing line circuits, the target switch module, the preset outgoing line circuit backup rate and the cabinet electrical corresponding to the outgoing line cabinet are verified respectively, and the system construction drawing of the substation to be designed is generated according to the verification results.

2. The substation design method according to claim 1, characterized in that: The step of obtaining outgoing line circuit information of the substation to be designed, and determining the transformers of each outgoing line circuit and the load rate of each transformer according to the outgoing line circuit information, includes: Fill in the information of each outgoing line circuit in the load statistics distribution table according to the project requirements of the substation to be designed; Calculating the calculated current of each outgoing line loop in the outgoing line loop information; According to the calculated current, selecting the set current of the outgoing line switch of the substation to be designed; Generate circuit information of the substation to be designed by using the circuit number, load name, equipment capacity, required coefficient, calculated current and set current of each outgoing circuit; According to the outgoing line loop information, the transformer corresponding to each outgoing line loop and the load rate of the transformer are determined.

3. The substation design method according to claim 2, characterized in that: The determining of equipment parameters adapted for each transformer based on each transformer and its load rate includes: Reading the load statistics distribution table; Based on the load statistical distribution table and preset design requirements, equipment parameters suitable for each transformer are selected through each transformer and the load rate of each transformer; wherein the equipment parameters include high-voltage incoming cable parameters, transformer-side low-voltage incoming frame circuit breaker and bus tie circuit breaker parameters, reactive capacitor compensation parameters and active filter device parameters.

4. The substation design method according to claim 1, characterized in that: Also includes: According to the preset power supply plan, select the voltage level, high-voltage cabinet type and metering method of the substation to be designed from the high-voltage part setting page of the drawing assistant software; According to the reserved space of the preset project building, the transformer layout corresponding to the substation to be designed is determined.

5. The substation design method according to claim 1, characterized in that: The step of extracting the target number of outgoing line circuits and the target switch module of each transformer from the outgoing line circuit information, and calculating the number of outgoing line cabinets of the substation to be designed by using a preset outgoing line circuit reserve rate, a preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits, and the target switch module, includes: Extracting the initial number of outgoing line loops and the initial switch module of each transformer from the outgoing line loop information; Determine whether the initial number of outgoing line circuits and the initial switch module number are within a preset reasonable range for low-voltage outgoing line circuit allocation; If not, the initial number of outgoing line circuits and the initial switch modulus are adjusted to generate new initial number of outgoing line circuits and initial switch modulus, and the process jumps to the step of determining whether the initial number of outgoing line circuits and the initial switch modulus meet the preset reasonable range of low-voltage outgoing line circuit allocation; If yes, the initial number of outgoing line loops and the initial switch modulus are determined as the target number of outgoing line loops and the target switch modulus; The number of outgoing line cabinets of the substation to be designed is calculated using the preset outgoing line circuit reserve rate, the preset low-voltage outgoing line cabinet module, the target number of outgoing line circuits and the target number of switches.

6. The substation design method according to claim 1, characterized in that: The method of allocating all outgoing line circuits of each transformer according to a preset allocation rule, and placing each outgoing line circuit and a spare circuit in an outgoing line cabinet of the substation to be designed according to the allocation result, includes: Classifying all outgoing line loops of each transformer according to different transformers to generate a plurality of outgoing line loops of the transformer; Arrange the outgoing cabinets of each load in the order of preset load levels; Arrange the load levels according to the switch setting value sorting rules of the outgoing line circuit, and place the loads corresponding to each load level in the corresponding outgoing line cabinet; Each of the outgoing line circuits and the standby circuit is placed in each of the outgoing line cabinets according to preset placement rules.

7. The substation design method according to claim 1, characterized in that: The step of respectively verifying the load rate, the equipment parameters, the target number of outgoing line circuits, the target switch module, the preset outgoing line circuit standby rate, and the electrical system of the cabinet corresponding to the outgoing line cabinet, and generating a system construction drawing of the substation to be designed according to the verification results, includes: Verifying the load rate and equipment parameters of each transformer to generate a first verification result; Verifying the integrity of the outgoing line loops corresponding to the target number of outgoing line loops and the target switch module to generate a second verification result; Verifying the preset outgoing line loop standby rate to generate a third verification result; Calculating the sum of all set currents of the outgoing switches corresponding to the outgoing cabinet, and verifying the sum of all the set currents to generate a fourth verification result; Saving parameter information and / or setting information corresponding to the first verification result, the second verification result, the third verification result, and the fourth verification result respectively; A system construction drawing of the substation to be designed is generated based on the parameter information and / or the setting information data.

8. A substation design system, characterized in that: Applicable to drawing assistant software, including: An acquisition module is used to obtain the outgoing line circuit information of the substation to be designed, and determine the transformer of each outgoing line circuit and the load rate of each transformer according to the outgoing line circuit information; An equipment parameter module, configured to determine equipment parameters suitable for each transformer based on each transformer and its load factor; an extraction module, configured to extract the target number of outgoing line circuits and the target switch modulus of each transformer from the outgoing line circuit information, and calculate the number of outgoing line cabinets of the substation to be designed by using a preset outgoing line circuit reserve rate, a preset low-voltage outgoing line cabinet modulus, the target number of outgoing line circuits and the target switch modulus; An allocation module is used to allocate all outgoing line circuits of each transformer according to a preset allocation rule, and place each outgoing line circuit and a spare circuit in an outgoing line cabinet of the substation to be designed according to the allocation result; The verification module is used to verify the load rate, the equipment parameters, the target number of outgoing line circuits, the target switch module, the preset outgoing line circuit backup rate and the cabinet electrical corresponding to the outgoing line cabinet, and generate the system construction drawing of the substation to be designed according to the verification results.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the substation design method according to any one of claims 1 to 7 is implemented.

10. A computer program product, characterized in that The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer is caused to execute the substation design method according to any one of claims 1 to 7.

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