A substation design method and system

Abstract

The application relates to the technical field of substation design, and discloses a substation design method and system. The application comprises the following steps: obtaining outgoing line loop information and calculating the load rate of a transformer; matching and adapting the equipment specifications based on the transformer parameters; calculating the number of outgoing cabinets in combination with the pre-equipment utilization rate, the cabinet module and the loop data; distributing the loop to the outgoing cabinets according to the load level and the current size rule and configuring a standby loop; and finally generating a system construction drawing through multidimensional checking. The whole process is driven by data instead of manual operation, and the whole process automation from information input to drawing output is realized. The application automatically calculates the load rate, matches the equipment parameters and distributes the outgoing loop, thereby saving the designers from the tedious work of manually checking hundreds of loop information and greatly shortening the original design period of several days. The application solves the technical problem that the existing design highly depends on manual operation, the designers need to spend a lot of time in checking all the power loop information, and the design efficiency is low.

Description

TECHNICAL FIELD

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

[0002] With the continuous development of social economy, the demand for electricity of various industries is increasing, and many enterprises and industrial parks need to transform the existing power supply system due to the need of production and operation or expansion and upgrading. The design of the substation below 35kV becomes the key link to meet such demand. As the core node connecting the public power grid and user power equipment, the design quality of the substation directly relates to the safety, reliability and economy of user power consumption. Therefore, under the background of continuous rise of power demand, the design task of substation below 35kV is increasingly heavy, and higher requirements are put forward for the accuracy and efficiency of the design.

[0003] Therefore, when carrying out the design of the substation, the existing designers need to check the power consumption indicators of the power consumption party in detail, collect the specific information of each power consumption circuit one by one, including load type, power size, running characteristics, etc. Secondly, all the collected information is summarized to calculate the power consumption capacity of the substation, determine the core parameters such as main transformer capacity and outgoing line circuit configuration. Finally, the relevant design parameters are reported to the power supply company, and after obtaining the approval of the power supply company on the power supply capacity, the substation construction drawing can be drawn. However, due to the significant differences in production technology and load characteristics of different power consumption enterprises, the above design process highly depends on manual operation, and the designers need to spend a lot of time checking all the power consumption circuit information, resulting in low design efficiency. SUMMARY

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

[0005] The first aspect of the present application provides a substation design method applied to a drawing assistant software, comprising:

[0006] Obtaining the 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;

[0007] Determining the equipment parameters matched with each transformer based on each transformer and the load rate of each transformer;

[0008] extracting a target outgoing line circuit quantity and a target switch module number of each transformer from the outgoing line circuit information, and calculating the outgoing line cabinet quantity of the to-be-designed substation by using a preset outgoing line circuit backup rate, a preset low-voltage outgoing line cabinet module number, the target outgoing line circuit quantity and the target switch module number;

[0009] allocating all outgoing line circuits of each transformer according to a preset allocation rule, and placing each outgoing line circuit and a backup circuit in an outgoing line cabinet of the to-be-designed substation according to an allocation result;

[0010] checking the load rate, the device parameter, the target outgoing line circuit quantity, the target switch module number, the preset outgoing line circuit backup rate and a cabinet body corresponding to the outgoing line cabinet, respectively, and generating a system construction drawing of the to-be-designed substation according to a checking result.

[0011] Optionally, the outgoing line circuit information of the to-be-designed substation is obtained, and the transformer of each outgoing line circuit and the load rate of each transformer are determined according to the outgoing line circuit information, including:

[0012] filling in each outgoing line circuit information in a load statistics allocation table according to a project requirement of the to-be-designed substation;

[0013] calculating a calculation current of each outgoing line circuit in the outgoing line circuit information;

[0014] selecting a setting current of an outgoing line switch of the to-be-designed substation according to the calculation current;

[0015] generating circuit information of the to-be-designed substation by using a circuit number, a load name, a device capacity, a required coefficient, a calculation current and a setting current of each outgoing line circuit;

[0016] determining the transformer corresponding to each outgoing line circuit and the load rate of the transformer according to the outgoing line circuit information.

[0017] Optionally, the device parameter suitable for each transformer is determined based on each transformer and the load rate of each transformer, including:

[0018] reading the load statistics allocation table;

[0019] selecting the device parameter suitable for each transformer by each transformer and the load rate of each transformer based on the load statistics allocation table and a preset design requirement; wherein the device parameter includes a high-voltage incoming line cable parameter, a transformer side low-voltage incoming line frame circuit breaker and a bus tie circuit breaker parameter, a reactive power capacitor compensation parameter and an active filter device parameter.

[0020] Optionally, the method further includes:

[0021] selecting, from a high-voltage part setting page of the drawing assistant software, a voltage level, a high-voltage cabinet type and a metering mode of the substation to be designed according to a preset power supply scheme;

[0022] determining a transformer arrangement form corresponding to the substation to be designed according to a preset project building reserved space.

[0023] Optionally, the target outgoing line circuit quantity and the target switch module of each transformer are extracted from the outgoing line circuit information, and the outgoing cabinet quantity of the substation to be designed is calculated by using a preset outgoing line circuit backup rate, a preset low-voltage outgoing line cabinet module, the target outgoing line circuit quantity and the target switch module, including:

[0024] extracting an initial outgoing line circuit quantity and an initial switch module of each transformer from the outgoing line circuit information;

[0025] judging whether the initial outgoing line circuit quantity and the initial switch module conform to a preset low-voltage outgoing line circuit distribution reasonable range;

[0026] if not, adjusting the initial outgoing line circuit quantity and the initial switch module to generate a new initial outgoing line circuit quantity and a new initial switch module, and jumping to execute the step of judging whether the initial outgoing line circuit quantity and the initial switch module conform to the preset low-voltage outgoing line circuit distribution reasonable range;

[0027] if yes, determining the initial outgoing line circuit quantity and the initial switch module as the target outgoing line circuit quantity and the target switch module;

[0028] calculating the outgoing cabinet quantity of the substation to be designed by using the preset outgoing line circuit backup rate, the preset low-voltage outgoing line cabinet module, the target outgoing line circuit quantity and the target switch module.

[0029] Optionally, all outgoing line circuits of each transformer are distributed according to a preset distribution rule, and each outgoing line circuit and a backup circuit are placed in an outgoing cabinet of the substation to be designed according to a distribution result, including:

[0030] classifying all outgoing line circuits of each transformer according to different transformers to generate a plurality of outgoing line circuits of the transformers;

[0031] arranging outgoing cabinets where each load is located according to a preset load level order;

[0032] arranging each load level according to a switch setting value sorting rule of the outgoing line circuit, and placing a load corresponding to each load level in a corresponding outgoing cabinet;

[0033] The outgoing line circuits and the backup circuits are placed in the outgoing line cabinets according to preset placement rules.

[0034] Optionally, the load rate, the device parameter, the target outgoing line circuit number, the target switch module number, the preset outgoing line circuit backup rate and the cabinet body corresponding to the outgoing line cabinet are verified respectively, and a system construction drawing of the substation to be designed is generated according to a verification result, comprising:

[0035] The load rate and the device parameter of each transformer are verified to generate a first verification result;

[0036] The outgoing line circuit integrity corresponding to the target outgoing line circuit number and the target switch module number is verified to generate a second verification result;

[0037] The preset outgoing line circuit backup rate is verified to generate a third verification result;

[0038] The sum of all setting currents of outgoing switches corresponding to the outgoing line cabinet is calculated, and all the sum of the setting currents is verified to generate a fourth verification result;

[0039] The parameter information or / and setting information corresponding to the first verification result, the second verification result, the third verification result and the fourth verification result is saved;

[0040] According to the parameter information or / and the setting information data, a system construction drawing of the substation to be designed is generated.

[0041] The second aspect of the application provides a substation design system applied to a drawing assistant software, comprising:

[0042] An acquisition module is configured to acquire outgoing line circuit information of a substation to be designed, and determine transformers of each outgoing line circuit and load rates of each transformer according to the outgoing line circuit information;

[0043] A device parameter module is configured to determine device parameters suitable for each transformer based on each transformer and the load rates of each transformer;

[0044] An extraction module is configured to extract a target outgoing line circuit number and a target switch module number 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 backup rate, a preset low-voltage outgoing line cabinet body module number, the target outgoing line circuit number and the target switch module number;

[0045] A distribution module is configured to distribute all outgoing line circuits of each transformer according to a preset distribution rule, and place each outgoing line circuit and backup circuit in an outgoing line cabinet of the substation to be designed according to a distribution result.

[0046] The checking module is used for checking the load rate, the device parameter, the target outlet circuit quantity, the target switch module quantity, the preset outlet circuit standby rate and the outlet cabinet corresponding cabinet body electricity respectively, and generating the system construction drawing of the to-be-designed substation according to the checking result.

[0047] The third aspect of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed to realize the substation design method according to any one of the above.

[0048] The fourth aspect of the present application provides a computer program product, which comprises a computer program stored on a non-transitory computer readable storage medium, and the computer program comprises program instructions, wherein when the program instructions are executed by a computer, the computer executes the substation design method according to the above.

[0049] From the above technical solutions, the present application has the following advantages:

[0050] The present application firstly acquires outlet circuit information and calculates the load rate of the transformer; matches the device specification based on the transformer parameter; calculates the outlet cabinet quantity in combination with the pre-device utilization rate, the cabinet module and the circuit data; allocates the circuit to the outlet cabinet according to the load level and the current size rule and configures the standby circuit; and finally generates the system construction drawing through multi-dimensional checking. The whole process is driven by data instead of manual operation, realizing the full-process automation from information input to drawing output. The present application automatically calculates the load rate, matches the device parameter and allocates the outlet circuit, thereby saving the tedious work of manually checking hundreds of circuit information by the designer and greatly shortening the design period of several days. With the aid of standardized data input and automatic checking, the problems of circuit mismatch and parameter inconsistency caused by manual omission are avoided, and the consistency of the system drawing and the order drawing is ensured, thereby improving the design efficiency and significantly reducing the project delay risk caused by the long time of information checking. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0052] Figure 1 A step flow chart of a substation design method provided by the first embodiment of the present application is shown in the figure;

[0053] Figure 2An information list of outgoing line circuit information provided for the first embodiment of the present application;

[0054] Figure 3 A page diagram for reading capacity and switch information provided for the first embodiment of the present application;

[0055] Figure 4 An upper half page diagram for reading capacity and switch information provided for the first embodiment of the present application;

[0056] Figure 5 A lower half page diagram for reading capacity and switch information provided for the first embodiment of the present application;

[0057] Figure 6 A page diagram for selecting a first cabinet arrangement provided for the first embodiment of the present application;

[0058] Figure 7 A page diagram for selecting a second cabinet arrangement provided for the first embodiment of the present application;

[0059] Figure 8 A page diagram for selecting a third cabinet arrangement provided for the first embodiment of the present application;

[0060] Figure 9 A page diagram for previewing low-voltage outgoing line switches provided for the first embodiment of the present application;

[0061] Figure 10 A page diagram for adjusting transformer outgoing line parameters generated by switches provided for the first embodiment of the present application;

[0062] Figure 11 A page diagram for prompting error information provided for the first embodiment of the present application;

[0063] Figure 12 A page diagram for outgoing line cabinets generated by switches provided for the first embodiment of the present application;

[0064] Figure 13 Another page diagram for outgoing line cabinets generated by switches provided for the first embodiment of the present application;

[0065] Figure 14 A structure block diagram of a substation design system provided for the second embodiment of the present application. DETAILED DESCRIPTION

[0066] The embodiments of the present application provide a substation design method and system, which are used for solving the technical problem of low design efficiency caused by the fact that the existing design process highly depends on manual operation and designers need to spend a lot of time in checking all power circuit information.

[0067] In order to make the application purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the following described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0068] Please refer to Figures 1 to 13 , Figure 1 A step flow chart of a substation design method provided for the first embodiment of the present application.

[0069] The substation design method provided by the present application is applied to a drawing assistant software and comprises the following steps.

[0070] In step 101, the outgoing line circuit information of a substation to be designed is acquired, and the transformers of each outgoing line circuit and the load rate of each transformer are determined according to the outgoing line circuit information.

[0071] In the embodiments of the present application, the substation to be designed refers to a user substation below 35kV that needs to be designed.

[0072] The 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.

[0073] The outgoing line circuit refers to the circuit path drawn from the low-voltage side of the substation to supply power to specific power equipment or areas (such as basement lighting and weak current machine room). Each outgoing line circuit corresponds to an independent power load and needs to be controlled by a circuit breaker or the like.

[0074] The transformer refers to the core device in the substation for converting high-voltage power (such as 10kV and 20kV) into low-voltage power (such as 0.4kV) to provide power support for the outgoing line circuit.

[0075] The load rate of the transformer refers to the ratio of the actual load to the rated capacity of the transformer (the calculation formula can be simplified as: load rate = actual load ÷ rated capacity × 100%).

[0076] The present application standardizes the collection format of all power circuits in the project of the substation to be designed in the form of an Excel table, assists the designer in determining the overall power capacity of the project and helps the designer to reasonably allocate the load of each transformer. On the basis of the standardized table, a user substation drawing assistant software is developed based on the Zhikang CAD platform (hereinafter referred to as CAD). It can automatically generate the primary system diagram of the user substation and other core contents such as the electrical order drawing according to the standardized table filled by the designer.

[0077] Collect detailed information of all outgoing circuits (such as equipment capacity, power factor, etc.) through the load statistical distribution table, which is the basis for subsequent design. Based on the outgoing circuit information, each circuit is assigned to a specific transformer (such as the designer filling in which transformer to power each circuit), ensuring 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 scheme (such as avoiding excessive load rate leading to transformer overload or excessive load rate causing resource waste).

[0078] Further, step 101 comprises the following sub-steps:

[0079] S11, filling in each outgoing circuit information in the load statistical distribution table according to the project requirements of the substation to be designed.

[0080] In the embodiment of the present application, the load statistical distribution table refers to a standardized table tool designed based on the Excel platform, which is used to centrally collect key information of all low-voltage outgoing circuits in the substation to be designed, and automatically complete electrical parameter calculation, load distribution assistance and other functions. Its core function is to standardize data collection format, simplify the calculation work of designers, and provide basic data support for subsequent substation equipment selection and drawing preparation.

[0081] The designer uses the load statistical distribution table (hereinafter referred to as distribution table) contained in the present application at the beginning of contacting the project, and centrally collects all circuits provided by the building electrical professional in the project which need to be powered by the user substation into the table. According to the project requirements, the designer fills in each outgoing circuit information including circuit number, load name, equipment capacity (kW), demand factor, equipment power factor, and grade of electrical load, etc., thereby obtaining each outgoing circuit information.

[0082] S12, calculating the calculation current of each outgoing circuit in the outgoing circuit information.

[0083] In the embodiment of the present application, the calculation current refers to the current automatically calculated by the built-in formula in the table based on the outgoing circuit information (such as equipment capacity, demand factor, equipment power factor, etc.) filled in the load statistical distribution table. It is an important basis for the designer to select the setting current of the outgoing switch of the substation, and is directly related to the selection and safe operation of the electrical equipment of the outgoing circuit.

[0084] The distribution table automatically calculates the calculation current (the current size of the circuit under normal use in the theoretical state) of each outgoing circuit.

[0085] S13, selecting the setting current of the outgoing switch of the substation to be designed according to the calculation current.

[0086] In the embodiment of the present application, setting current refers to the rated action current value set by the designer for the outgoing line switch (such as a low-voltage circuit breaker) of the substation to be designed according to the calculated current of the outgoing line circuit.

[0087] In the load statistical distribution table, when the device capacity, need factor, power factor and other information of a certain outgoing line circuit are filled in, the table automatically calculates the calculated current of the circuit according to these parameters, and the designer determines the setting current of the outgoing line switch of the circuit according to the calculated current to ensure the safety and rationality of the circuit operation.

[0088] S14, using the circuit number, load name, device capacity, need factor, calculated current and setting current of each outgoing line circuit, generating the circuit information of the substation to be designed.

[0089] In the embodiment of the present application, referring to Figure 2 As shown in the figure, the core information of each outgoing line circuit, such as circuit number (such as WLM1), load name (such as basement lighting B1-ZAL1), device capacity (kW), need factor, calculated current obtained by calculation and setting current selected according to the calculated current, is collected, and after these parameters are systematically integrated, comprehensive information reflecting the electrical characteristics of each outgoing line circuit of the substation to be designed is formed. These circuit information is the basis for subsequent transformer load distribution, device parameter matching and automatic generation of construction drawings such as primary system diagram and electrical order drawing, ensuring the integrity and consistency of data in the design process and providing support for the accuracy and efficiency of the substation design.

[0090] S15, according to the outgoing line circuit information, determining the corresponding transformer of each outgoing line circuit and the load rate of the transformer.

[0091] In the embodiment of the present application, after filling in all the outgoing line circuits, the designer fills in which transformer supplies power for each circuit according to the calculated parameters.

[0092] In this process, the designer can know the power consumption capacity of the project and how many transformers are set as a more reasonable scheme at a glance. The table also displays the load rate of the current transformer when the designer assigns the load of the outgoing line circuit to the specific transformer, which is used as a technical reference for the designer in subsequent distribution work. After filling in all the outgoing line circuit information and assigning the lines of all the circuits to the corresponding transformers, the first part of the work is completed.

[0093] This step relies on the powerful functions of Excel itself, simplifies the work of designers by using built-in formulas in the table, and omits the previous large amount of calculation work of designers. It is convenient for designers to determine the capacity of each power transformer, and at the same time, it assists designers to make transformer distribution of each loop, which lays a foundation for correctly and efficiently drawing the primary system diagram of the user substation and the core content of the electrical order drawing in the future.

[0094] Step 102, determining the equipment parameters matched with each transformer based on each transformer and the load rate of each transformer.

[0095] In the embodiment of the present application, the equipment parameters refer to the technical specifications and performance indicators of various electrical equipment matched with the transformer. These parameters need to be determined according to the capacity of the transformer, the load rate and the related design specifications, in order to ensure the safety, economy and reliability of the operation of the substation. Specific equipment parameters include: the model of high-voltage incoming line cable (such as ZRYJV22-8.7 / 15kV-3*120mm²), the setting parameters of low-voltage incoming line frame circuit breaker and bus tie circuit breaker (such as shell rated current, overload long-time delay current), the capacity of reactive power compensation device (such as 480kVar), the specifications of active filter device (such as 250A) and the like.

[0096] Firstly, based on the transformer of the allocated load and its real-time load rate, the actual operation demand (such as capacity, voltage level, etc.) of the transformer is determined; then, according to the national and local specifications (such as GB50053-2013, DB32 / T3748-2020), combined with the power supply company's drawing review standards and project experience, the specific parameters of the equipment such as high-voltage incoming line cable, circuit breaker and reactive power compensation device matched with the transformer are matched. For example, a 1600kVA capacity transformer needs to be matched with a 3200A shell current circuit breaker and a 480kVar reactive power compensation device, to ensure that the equipment parameters match the transformer capacity and load rate, avoid power supply failure or resource waste caused by mismatched parameters, and provide accurate equipment selection basis for subsequent construction drawing design.

[0097] Further, step 102 includes the following sub-steps:

[0098] S21, reading the load statistical allocation table.

[0099] In the embodiment of the present application, the user drawing assistant software (hereinafter referred to as drawing assistant) is loaded in CAD using the "NETLOAD" command, and the load statistical allocation table which has been filled in is read in the pop-up interface.

[0100] S22, based on the load statistics distribution table and the preset design requirement, selecting device parameters matched with each transformer through each transformer and the load rate of each transformer; wherein the device parameters include high-voltage incoming line cable parameters, transformer-side low-voltage incoming line frame circuit breaker and bus tie circuit breaker parameters, reactive power capacitor compensation parameters and active filter device parameters.

[0101] In the embodiment of the present application, the preset design requirement refers to the requirements of various provisions and regulations, and the results of the design review of the power supply company for many years and the design experience of the staff for many years.

[0102] The high-voltage incoming line cable parameters refer to the technical specifications of the cable connected to the high-voltage side of the transformer from the power supply source, which need to be determined according to the rated current, voltage level and laying environment of the high-voltage side of the transformer. It includes cable model (such as ZRYJV22, flame-retardant cross-linked polyethylene steel tape armored cable), voltage level (such as 10kV corresponding to 8.7 / 15kV, 20kV corresponding to 18 / 24kV), cross-sectional area (such as 3*120mm²), etc., which need to meet the requirements of short-circuit current resistance, overload capacity and future expansion margin.

[0103] The transformer-side low-voltage incoming line frame circuit breaker parameters refer to the technical indicators of the circuit breaker connected between the low-voltage side (0.4kV) of the transformer and the low-voltage bus, including shell frame rated current, overload long-time delay current (Ir1), short-circuit short-time delay current (Ir2), short-circuit instantaneous current (Ir3), split excitation function and loss of voltage delay, etc., which need to match the rated current and short-circuit current level of the low-voltage side of the transformer.

[0104] The bus tie circuit breaker parameters refer to the technical indicators of the circuit breaker connected between the low-voltage buses of the two transformers when double power supply is provided, and the parameter requirements are consistent with those of the low-voltage incoming line frame circuit breaker, which are used to ensure the electrical connection between the two transformers and the safety isolation during fault.

[0105] The reactive power capacitor compensation parameters refer to the technical specifications of the capacitor compensation device used for compensating the reactive power of the power grid and improving the power factor, mainly including compensation capacity (determined according to 20%~30% of the transformer capacity, such as 480kVar for a 1600kVA transformer), functional characteristics (such as zero-crossing switching, split-phase compensation, and split-phase compensation capacity not less than 40% of the total capacity) and supporting filter and inrush current suppression device parameters.

[0106] The active filter device parameters refer to the technical indicators of the active filter equipment used for suppressing the harmonics of the power grid and improving the power quality, including device rated current (such as 250A), bus CT mutual inductor transformation ratio (such as 3000 / 5A), etc., which need to be determined according to the transformer capacity, the harmonic characteristics of the load and the requirements of the user on the power quality.

[0107] Drawing assistant will combine the requirements of various provisions and the design experience of power supply company's staff for many years, according to the capacity of transformer, directly provide the required parameters of 0.4kV incoming line cabinet and busbar cabinet specifications, reactive power compensation device parameters, active filter device parameters, transformer size and 0.4kV busbar specifications, etc. In the actual design process, designers need to refer to national standard GB50053-2013 << 20KV and below substation design specification >>, national standard GB50054-2011 << low voltage power distribution design specification >>, national standard GB50052-2009 << power supply system design specification >>, national standard GB51348-2019 << civil building electrical design standard >>, as well as Jiangsu province local standard DB32 / T3748-2020 << 35KV and below customer side substation construction standard >>. According to the requirements in the standard, according to the capacity of different transformers, different specifications of equipment are matched to ensure the safety, economy and reliability of power supply. The main equipment parameters are:

[0108] 1. The parameters of high-voltage incoming line cable:

[0109] According to the requirements of the specification, the incoming line cable in the substation is uniformly selected as ZRYJV22 (flame-retardant cross-linked polyethylene steel tape armored cable). According to the voltage level, 8.7 / 15kV (rated insulation voltage to ground is 8.7kV, rated insulation voltage between phases is 15kV) is selected for 10kV voltage level; 18 / 24kV (rated insulation voltage to ground is 18kV, rated insulation voltage between phases is 24kV) is selected for 20kV voltage level. The rated current calculation formula of transformer at high voltage side is:

[0110]

[0111] In the formula, S is the capacity of transformer; U is the voltage level of transformer high voltage side.

[0112] Taking a 1600kVA capacity 10kV dry-type transformer as an example, the rated current of transformer high voltage side is calculated to be about 92.4A according to the above formula. Considering the possibility of short-time overload and the margin for future user expansion, after consulting the product technical manual of ZRYJV22 cable and combining the years of auditing opinions of power supply company and the years of design experience of staff, finally, the drawing assistant selects ZRYJV22-8.7 / 15kV-3*120mm2 type for the high voltage incoming line cable of 1600kVA transformer.

[0113] 2. The parameters of transformer 0.4kV side low voltage incoming line circuit breaker and busbar circuit breaker (circuit breaker between two transformers in dual power supply):

[0114] In the case of different transformer capacity, still is first calculated out the transformer in low voltage side (0.4kV side) rated current its calculation formula is:

[0115]

[0116] In the formula, S The capacity of transformer; U The voltage level of transformer high voltage side.

[0117] With a 1600kVA capacity of 10kV dry-type transformer as an example, according to the above formula, the transformer low voltage side rated current is about 2309A. Combined with the current market import brand, joint venture brand and domestic brand frame circuit breaker of each parameter, according to the requirements of the specification and the performance requirements of the power supply company for the limiting section ability of the circuit breaker, finally, the drawing assistant in 1600kVA transformer 0.4kV side low voltage incoming line frame circuit breaker and bus tie circuit breaker selection: shell frame rated current is 3200A, overload long delay current Ir1 is 2500A, short circuit short delay current Ir2 is 16kA, short circuit instantaneous current Ir3 is 20kA with electric split function and loss voltage delay is 3 seconds of 4 phase frame circuit breaker.

[0118] 3, the parameter of reactive power compensation:

[0119] In the parameter of reactive power compensation equipment, the state and local standards have clear provisions 10kV, 20kV substation can be determined according to 20% ~ 30% of the transformer capacity. Therefore, with a 1600kVA capacity of 10kV dry-type transformer as an example, according to the provisions in the standard, the compensation capacity of the reactive power compensation device configured for the transformer should be 480kVA, and has the function of over zero switching, separate phase compensation, harmonic suppression filter device and inrush device, and the separate phase compensation capacity should not be less than 40% of the total compensation capacity.

[0120] 4, the parameter of active filter device:

[0121] For some users with higher requirements for power quality or some precision equipment need to exclude the interference of multiple harmonics, so it is necessary to install active filter equipment to further improve the power quality. The staff combined with years of design experience and feedback from various large and medium-sized projects, set up a complete set of active filter equipment parameter setting table for different capacity of transformer. Similarly, with a 1600kVA capacity of 10kV dry-type transformer as an example, its active filter device specification should be set to 250A, and the CT mutual inductor variable ratio of its bus should be set to 3000 / 5A.

[0122] The above is the data obtained under different transformer capacity, strictly in accordance with the national, regional (Jiangsu Province) standards and industry specifications combined with years of project experience. The staff embeds these data into the drawing assistant plug-in, saves the time of tedious calculation parameters and query standard specifications when designing the substation, makes the process efficient and eliminates the possibility of device parameters and transformer capacity mismatch caused by designers' calculation errors.

[0123] Further, the method further comprises the following sub-steps:

[0124] S31, according to the preset power supply scheme, selecting the voltage grade, high-voltage cabinet type and metering mode of the substation to be designed from the high-voltage part setting page of the drawing assistant software.

[0125] In the embodiment of the application, the preset power supply scheme refers to the file of the "Power Supply Scheme Reply Form" of the power supply company.

[0126] The voltage grade refers to the voltage standard of the power supply connected to the substation to be designed, which is the power system voltage level determined according to the "Power Supply Scheme Reply Form" approved by the power supply company. In the present application, there are two kinds of 10kV and 20kV, which directly affect the design elements such as high-voltage cable parameters, equipment insulation level, etc. For example, the insulation standard of 10kV voltage grade high-voltage incoming cable is 8.7 / 15kV.

[0127] The high-voltage cabinet type refers to the cabinet structure type used for receiving and distributing electric energy on the high-voltage side of the substation, which needs to be selected according to the project electricity volume, specification requirements and equipment cost, etc. The types mentioned in the present application include ring network cabinet (suitable for conventional capacity projects), mid-set cabinet (suitable for larger capacity projects) and center station direct connection (suitable for projects with extremely large electricity volume and combined construction with user power supply center station), which differ in limit breaking capacity and structure complexity.

[0128] The metering mode refers to the way of metering and charging the electricity used by the power supply company in the substation, mainly embodied in the installation position of the meter. In the present application, it is divided into metering (meter placed in the substation to be designed) and non-metering (meter not set in the substation), which needs to be determined according to the "Power Supply Scheme Reply Form" and the actual situation of the project.

[0129] After configuring the transformer capacity of the user substation and the parameters of the corresponding supporting electrical devices according to the information in the load statistical distribution table, the power supply related setting of the user substation is entered. After the construction party applies for electricity, the power supply company will approve the power source of the user substation according to the electricity demand provided by the construction party and in combination with the existing power supply situation in the surrounding area. Usually, the power supply company will set forth the power supply source approved by the power supply company for the electricity power supply application submitted by the user in the form of a file of a power supply scheme reply form. The power supply scheme reply form mainly includes the voltage level (10 kV / 20 kV) of the power source and the access point (a certain large transformer substation near the power consumption area) of the power source, and it is clearly stated in the power supply scheme reply form that the power supply company charges the user substation in what way.

[0130] After the settings in steps 101 and 102 are performed, the designer needs to select the voltage level of the substation as 10 kV or 20 kV in the 'high-voltage part setting' area of the drawing assistant software interface ① according to the power supply scheme reply form approved by the power supply company. In terms of the high-voltage incoming line cabinet setting, if the electricity consumption of the project is very large, a separate user power supply center station needs to be set up, and the user substation and the user power supply center station are designed to be built together, and then the 'center station direct connection' option is selected, otherwise, according to the capacity of the transformer, the designer decides to select the cabinet of the high-voltage power receiving part as 'ring network cabinet' or 'central cabinet' in accordance with the specifications and requirements of the power supply company, taking into full consideration the difference between the limit breaking capacity of the high-voltage power receiving cabinet and the equipment cost and other factors. Finally, according to the power supply scheme reply form and the basic situation of the project, it is determined whether the metering table of the power supply company is placed in the user substation, that is, whether the user substation designed this time has the metering of the power supply company, which is shown in Figure 3 and Figure 5 .

[0131] S32, reserving space according to a preset project building, and determining a transformer arrangement form corresponding to the substation to be designed.

[0132] In the embodiment of the present application, the reserved space of the preset project building refers to the physical installation area planned in advance by the building specialty for the substation to be designed, including the width, length, layout and other space conditions of the room. The present application emphasizes that it is the key basis for determining the transformer arrangement form, for example, a specific arrangement mode needs to be used for a narrow and long room.

[0133] The transformer arrangement form refers to the spatial arrangement mode of the transformer and the supporting electrical devices in the substation, and the present application provides three preset forms:

[0134] Two transformers arranged in two rows: suitable for wide rooms, the transformers are arranged face to face, and the bus duct is at the tail end of the low-voltage cabinet;

[0135] 2 transformers in 1 row: suitable for narrow and long room, arranged in the same row according to the specification;

[0136] 2 transformers in 2 rows (bus tie-in front): similar to the first, but the bus tie-in cabinet is placed in front, which is convenient for future increase of outgoing circuit.

[0137] After the step S31 operation, the designer needs to check the project building and structural professional drawings, and determine the arrangement of electrical devices such as transformers in the user substation according to the room conditions reserved by the building professional for the user substation. According to the years of design experience of the staff and combined with a large number of already put into operation of substation project conditions, the drawing assistant software currently provides 3 kinds of arrangement forms respectively:

[0138] 1) 2 transformers in 2 rows

[0139] This arrangement form is the most commonly used arrangement form, suitable for the reserved site with larger room width, 2 transformers can be arranged face to face, and the bus duct connected by double power supply is at the tail end of the low voltage cabinet. See Figure 6 .

[0140] 2) 2 transformers in 1 row

[0141] This arrangement form exists in some narrow and long rooms, and the building professional reserves a narrow user substation room in order to improve the utilization rate of space when designing. According to the relevant substation arrangement form provisions in the "Civil Building Electrical Design Standard", 2 transformers can only be arranged in the same row. See Figure 7 .

[0142] 3) 2 transformers in 2 rows

[0143] The transformers and low voltage incoming line cabinet and capacitor compensation cabinet of this arrangement form are the same as the first), the difference is that the 0.4kV bus tie-in cabinet is placed in advance, which has the advantage that if the outgoing circuit is increased after the user substation is completed, it is particularly convenient. This arrangement form is suitable for some occasions where there is a possibility of change in future electricity use (such as sudden recruitment of shops in shopping malls that need to increase the power supply circuit). See Figure 8 .

[0144] So far, the designer uses the drawing assistant software to determine the high-voltage part of the user substation, the transformer and its supporting device, and the arrangement form by reading the load statistics distribution table and referring to the power supply company's reply to the "power supply scheme reply form" and other simple operations. If the designer does not use the drawing assistant software, the designer needs to frequently calculate various parameters and record, and after using the drawing assistant software, the design efficiency and correctness are greatly improved, and the designer only needs to spend more effort on checking the key data and comparing the "power supply scheme reply form" to set correctly.

[0145] Step 103, extracting the target outgoing line circuit quantity and the target switch module of each transformer from the outgoing line circuit information, and using the preset outgoing line circuit backup rate, the preset low-voltage outgoing line cabinet module, the target outgoing line circuit quantity and the target switch module to calculate the outgoing line cabinet quantity of the substation to be designed.

[0146] In the embodiment of the present application, the target outgoing line circuit quantity refers to the total number of all outgoing line circuits in the substation to be designed, which is the basis for classifying and managing each circuit.

[0147] The target switch module refers to the switch space unit (such as the module of the MNS cabinet, 1 module corresponds to a certain space size) determined according to the setting current and physical size of the outgoing line cabinet, which is used to plan the arrangement of the switch in the cabinet.

[0148] The preset outgoing line circuit backup rate refers to the capacity proportion reserved for the circuit to cope with future load growth, and the backup rate in the present application is 20%, which ensures that the switch and the cabinet have expansion space.

[0149] The preset low-voltage outgoing line cabinet module refers to the standard space unit of the cabinet, and the 9 modules of the MNS cabinet in the present application, that is, each cabinet can accommodate 9 modules of switches.

[0150] The outgoing line cabinet quantity refers to the total number of required outgoing line cabinets calculated according to the switch module, the backup rate and the cabinet module of each circuit (such as the fire load circuit of a certain transformer of a certain project has 8 circuits, 8 circuits correspond to 12 modules of switches, and after the multi-circuit is summarized, 9 modules per cabinet are calculated, and it is concluded that 2 cabinets are needed).

[0151] By integrating the key parameters (such as calculated current and setting current) of the circuit and the design standard (such as module and backup rate) of the cabinet, the system generates an outgoing line cabinet configuration scheme that meets the capacity matching, space rationality and reserved expansion demand, providing data support for subsequent construction drawing.

[0152] Further, step 103 includes the following substeps:

[0153] S41, extracting the initial outgoing line circuit quantity and the initial switch module of each transformer from the outgoing line circuit information.

[0154] In the embodiment of the present application, the initial number of outgoing line circuits refers to the total number of outgoing line circuits obtained in the initial design stage based on the core parameters (such as circuit number, calculated current, etc.) of each outgoing line circuit of the substation to be designed, which is basic data reflecting the scale of the power supply circuit of the substation.

[0155] The initial switch module refers to the initial occupied space unit set for the outgoing line switch of the substation according to the setting current of each outgoing line circuit and the parameters of the high-voltage incoming line and low-voltage equipment, which is a key indicator for measuring the physical size of the switch and the layout of the cabinet.

[0156] After the user completes the basic settings of steps 101 and 102, the "Save Scheme" button of the drawing assistant software is clicked to enter the "Preview Low-voltage Outgoing Line Switch" interface. In this interface, the drawing assistant software first reads all the outgoing line circuits in the load statistical distribution table and displays them in the form of a table. The table part will display the circuit number, load name, device capacity (kW), load level, and assigned transformer serial number (the load background color of transformer 1 is red, and the load background color of transformer 2 is yellow) of the outgoing line circuit in detail.

[0157] In order for the designer to more intuitively understand each power circuit, the drawing assistant software provides a "condition filtering" function, which can query the required circuit according to the load level or filter according to different transformers. At the same time, the "Low-voltage Outgoing Line Circuit Statistical Table" in the software displays the power supply situation of each transformer in two tables according to the number of outgoing line circuits (i.e. the initial number of outgoing line circuits) and the outgoing line switch module (i.e. the initial switch module) according to the load level, which tells the designer whether the number of outgoing line circuits set in the current load statistical distribution table is balanced, analyzes whether the allocation of each power circuit in the load statistical distribution table is reasonable from the number and physical size of the switch, and also provides a data basis for the next step of automatically allocating outgoing line circuits.

[0158] S42, judge whether the initial number of outgoing line circuits and the initial switch module meet the preset reasonable range of low-voltage outgoing line circuit distribution.

[0159] In the embodiment of the present application, refer to Figure 9As shown, the low-voltage outgoing line loop part in the upper right corner of the transformer 1 provides 19 loops, of which 6 are fire load loops, 6 are secondary load loops, and 7 are tertiary load loops; and the transformer 2 provides 20 loops, of which 6 are fire load loops, 6 are secondary load loops, and 8 are tertiary load loops. From the number of loops, the design is basically balanced. From the switch module (the size of the physical space occupied by the switch), the low-voltage outgoing line switch of the transformer 1 of the project needs to occupy 34 modules in total, of which 9 modules are fire load loops, 7 modules are secondary load loops, and 18 modules are tertiary load loops; and the low-voltage outgoing line switch of the transformer 2 needs to occupy 35 modules in total, of which 9 modules are fire load loops, 7 modules are secondary load loops, and 19 modules are tertiary load loops. These data statistics show that the number of low-voltage outgoing line cabinets on the low-voltage side bus of the two transformers is similar in physical space. Combined with the related calculation of the transformer load rate in the load statistical distribution table, the designer can quickly judge whether the distribution of the large number of low-voltage outgoing loops is reasonable. This also provides a strong criterion for the designer to solve the problem of how to judge whether a large number of outgoing loops are reasonably and balancedly distributed to two different transformers.

[0160] S43, if not, adjust the initial outgoing loop quantity and the initial switch module, generate a new initial outgoing loop quantity and an initial switch module, and jump to execute the step of judging whether the initial outgoing loop quantity and the initial switch module meet the preset low-voltage outgoing loop distribution reasonable range.

[0161] In the embodiment of the present application, according to the number of loops and the module of switches, two data statistics show that the number of low-voltage outgoing line cabinets on the low-voltage side bus of the two transformers is similar in physical space. Combined with the related calculation of the transformer load rate in the load statistical distribution table, the designer can quickly judge whether the distribution of the large number of low-voltage outgoing loops is reasonable. If not, the initial outgoing loop quantity and the initial switch module can be adjusted, and the new outgoing loop quantity and the switch module can be further judged whether the distribution of the large number of low-voltage outgoing loops is reasonable.

[0162] S44, if yes, the initial outgoing loop quantity and the initial switch module are determined as the target outgoing loop quantity and the target switch module.

[0163] In the embodiment of the present application, according to the number of loops and the module of switches, two data statistics show that the number of low-voltage outgoing line cabinets on the low-voltage side bus of the two transformers is similar in physical space. Combined with the related calculation of the transformer load rate in the load statistical distribution table, the designer can quickly judge whether the distribution of the large number of low-voltage outgoing loops is reasonable. If not, the initial outgoing loop quantity and the initial switch module can be adjusted, and the new outgoing loop quantity and the switch module can be further judged whether the distribution of the large number of low-voltage outgoing loops is reasonable.

[0164] S45, using the preset outgoing line circuit backup rate, the preset low-voltage outgoing line cabinet module, the target outgoing line circuit quantity and the target switch module, calculating the outgoing line cabinet quantity of the substation to be designed.

[0165] In the embodiment of the application, until step S44, the designer has set and checked all the design points of the user substation of this design through various software functions provided by the drawing assistant, and then the work of automatically distributing the numerous outgoing line circuits by using the drawing assistant software is carried out. The judgment logic of the drawing assistant software is introduced in detail as follows:

[0166] Firstly, according to the requirement of the power supply company, the backup rate of the low-voltage outgoing line circuit needs to reach 20%.

[0167] Secondly, the type of the low-voltage outgoing line cabinet currently used in the design on a large scale is MNS cabinet, and the cabinet has a total of 9 modules of space from top to bottom, which can be used to place various low-voltage outgoing line frame circuit breakers / drawer cabinet switches. Of course, if the project uses other types of cabinets, resulting in that the maximum number of switches that can be set on each cabinet is not 9, the designer can manually modify this data according to the actual situation.

[0168] Then, the designer can click "estimate outgoing line cabinet number", and the drawing assistant will calculate the number of low-voltage outgoing line cabinets required for placing outgoing line switches according to the different load levels of each transformer and the set backup rate. For example, in the project in Figure 9 , it can be seen in Figure 9 that the low-voltage outgoing line switches of transformer 1 need to occupy a total of 34 modules, of which 9 modules are for fire load circuits, 7 modules are for secondary load circuits, and 18 modules are for tertiary load circuits; and the low-voltage outgoing line switches of transformer 2 need to occupy a total of 35 modules, of which 9 modules are for fire load circuits, 7 modules are for secondary load circuits, and 19 modules are for tertiary load circuits. Taking transformer 1 as an example, 9 modules of space are required for placing switches for the fire load, and considering the 20% backup rate, the fire load of transformer 1 finally needs 9*(1+20%) = 10.8 ≈ 11 modules of space, and a single MNS outgoing line cabinet only has 9 modules of space available, so the drawing assistant determines and recommends that 2 MNS outgoing line cabinets should be used for placing outgoing line switches for the fire load of transformer 1. Other cases are similar, and the number of outgoing line cabinets required by all loads of the user substation can be calculated. Figure 9 In , the number of outgoing line cabinets required by the user substation is counted in the form of a table, and a total of 12 outgoing line cabinets are required, of which 6 outgoing line cabinets with 9 modules of space are required for each of transformer 1 and transformer 2.

[0169] Step 104, according to the preset distribution rule, distributing all the outgoing line circuits of each transformer, and placing each outgoing line circuit and backup circuit in the outgoing line cabinet of the substation to be designed according to the distribution result.

[0170] In the embodiment of the present application, the standby circuit refers to a circuit reserved for the substation to be designed, not directly assigned to the current outgoing line circuit but available for future expansion or temporary addition of load, and the parameters (such as calculated current and setting current) thereof need to be reserved with a margin according to the specification.

[0171] The outgoing cabinet refers to a cabinet body for installing high-voltage incoming line cables, low-voltage circuit breakers and other equipment, and is a physical carrier for centrally accommodating and protecting low-voltage incoming line frame circuit breakers, bus-tie circuit breakers and other devices.

[0172] In the design process of the substation to be designed, the designer assigns all outgoing line circuits to different outgoing cabinets according to the preset distribution rules (such as load balancing, specification requirements, etc.), and includes the standby circuits of each circuit (such as the reserved expansion circuit) in the overall layout, and finally completes the corresponding configuration of the outgoing cabinet and the circuit. Specifically, first, determine the outgoing cabinet to which each outgoing line circuit belongs according to the distribution rules, and then also include the standby circuits (for future expansion or temporary power supply) in 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 avoids the confusion of manual distribution through standardized distribution logic, ensures that the corresponding relationship between the substation outgoing cabinet and the circuit is clear and the layout is reasonable, and improves the design efficiency and accuracy.

[0173] Further, step 104 includes the following sub-steps:

[0174] S51, classify all outgoing line circuits of each transformer according to different transformers to generate outgoing line circuits of multiple transformers.

[0175] In the embodiment of the present application, after the number of outgoing cabinets is determined, the designer clicks the "outgoing line circuit custom arrangement" button, and the drawing assistant software automatically assigns each outgoing cabinet according to the different load levels and displays the assignment results in detail on the "adjust switch to generate CAD" page. This step liberates a large amount of work for the designer, and the brief working logic of the drawing assistant is as follows:

[0176] First, all outgoing line circuits are separated according to different transformers, and then strictly distinguished according to different load levels. That is, the outgoing line circuits of the same transformer and the same load level are counted together, and the subsequent distribution is mainly based on load level as the main distinguishing point.

[0177] S52, arrange the outgoing cabinets where each load is located according to the preset load level order.

[0178] In the embodiment of the present application, the preset load level order refers to the order of fire load > special first-class load > first-class load > second-class load > third-class load.

[0179] The switches in the low-voltage outgoing line cabinet are arranged in the order of fire load > special first-class load > first-class load > second-class load > third-class load, that is, the outgoing line cabinet closest to the transformer is the outgoing line cabinet in which the fire load is concentrated, the outgoing line cabinet in which the special first-class load is concentrated is arranged next, and so on.

[0180] S53, arranging each load grade according to the switch setting value sorting rule of the outgoing line circuit, and placing the load corresponding to each load grade in the corresponding outgoing line cabinet.

[0181] In the embodiment of the application, the switch setting value sorting rule refers to the order of the switch setting value from large to small.

[0182] For a single load grade, first, the frame switch with the largest outgoing line current is placed in the first cabinet (if such a circuit exists), and then the switch setting values of the outgoing line circuit are arranged in the corresponding outgoing line cabinet from large to small according to the size.

[0183] S54, placing each outgoing line circuit and standby circuit in each outgoing line cabinet according to a preset placement rule.

[0184] In the embodiment of the application, until step S53, the drawing assistant has automatically distributed all outgoing line circuits to the corresponding outgoing line cabinets according to different load grades, at this time, the designer can manually add a standby outgoing line cabinet, or click the “add standby” button to automatically add the corresponding standby switch. After adding the standby 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 standby switches in the current scheme meets the 20% requirement.

[0185] After the numerous outgoing line circuits and standby circuits are arranged in the low-voltage outgoing line cabinet according to the rules, the drawing assistant software provides a switch automatic sorting function, the purpose of which is to make the switch arrangement of each outgoing line cabinet from top to bottom more reasonable. The basic logic is: from top to bottom, large shell frame circuit breaker > small shell frame circuit breaker > 100A-250A plastic case switch > 400A plastic case switch.

[0186] Steps S51-S54 are illustrated as follows: Figures 10 to 13 The state after the drawing assistant software is assigned all outgoing line switches and the standby circuit is added. First, the transformer 1 outgoing line parameter index table and the transformer 2 outgoing line parameter index table in the upper left corner count the detailed data of the outgoing line circuit number in the current design scheme. The second column “outgoing line circuit number” represents the number of circuits that meet the screening requirements in the load distribution table, and the third column “placed switch number” represents the number of outgoing line circuits that the drawing assistant software automatically assigns, Figure 12 and Figure 13The same data in the second column and the third column proves that all circuits have been arranged; and the fourth column and the fifth column are the arrangement number statistics of the standby switches. The standby rate of the outgoing switch is finally calculated, which is used to provide data reference for the designer. After the operation of the above steps S51-S54 is completed, the switch arrangement of the outgoing cabinet 5 (three-level load) is: 400A molded case switch-630A frame switch (standby switch)-400A molded case switch (standby switch)-160A molded case switch (standby switch) from top to bottom. After clicking the sorting button, it is changed to: 630A frame switch (standby switch)-160A molded case switch (standby switch)-400A molded case switch-400A molded case switch (standby switch). The modified arrangement is more reasonable, which places the frame switch needing bus duct outgoing line at the top and places the switch with larger cable diameter and larger weight at the bottom. Thus, through simple button operation, all low-voltage outgoing circuits and standby circuits can be reasonably arranged in each outgoing cabinet, which greatly saves the time and effort of the designer, and also prevents a part of the possibility of making mistakes.

[0187] In step 105, the load rate, the device parameter, the target outgoing circuit quantity, the target switch module, the preset outgoing circuit standby rate and the cabinet body corresponding to the outgoing cabinet are respectively checked, and a system construction drawing of a substation to be designed is generated according to the checking result.

[0188] In the embodiment of the present application, the checking result refers to the result of checking the load rate, the device parameter, the target outgoing circuit quantity, the target switch module, the preset outgoing circuit standby rate and the cabinet body corresponding to the outgoing cabinet respectively.

[0189] The checking and confirming link before the system construction drawing is generated in the substation design, that is, the transformer load rate, various device parameters (such as high-voltage incoming cable, circuit breaker parameters), target total outgoing circuit quantity, switch module, preset outgoing circuit standby rate and cabinet body electrical characteristics (such as limit breaking capacity) are checked one by one, to ensure that each parameter meets the power supply specification, matches the calculated current / setting current and meets the project safety requirements, and then a system construction drawing of a substation to be designed is generated based on the checking result. This step guarantees the consistency of the construction drawing with the actual load, device characteristics and specification requirements through multi-dimensional parameter checking, which is a key link connecting the circuit information and the final construction drawing, and provides a compliance basis for subsequent automatic generation of primary system drawing, electrical order drawing and the like.

[0190] Further, step 105 includes the following sub-steps:

[0191] S61, checking the load rate and the device parameter of each transformer to generate a first checking result.

[0192] In the embodiment of the present application, the first check result refers to the result of checking the load rate and equipment parameters of each transformer.

[0193] For designers, the correctness of the design is always the first priority. As an auxiliary drawing tool for 35kV user substation, the drawing assistant software also has a very strict self-checking and verification process for the correctness of the generated drawings. After the user completes the above operations, there is a "check" button in the "adjust switch to generate CAD" interface. Clicking it can check the correctness of various data for the entire project. Only after the drawing assistant self-checking is completed without any problems, the scheme can be saved and the system diagram, system order drawing, and typical plan layout drawing can be directly generated in CAD. The self-checking content is as follows:

[0194] Verification of transformer capacity and supporting parameters:

[0195] First, return to the original data source load statistics allocation table to determine the capacity of the transformer again, and then recheck the supporting parameters according to the transformer capacity. During the design process, these parameters are automatically matched and set by the drawing assistant after reading the transformer capacity. However, in order to prevent possible manual errors or modifications by the designer, the drawing assistant will recheck the parameters including: high-voltage incoming cable parameters, transformer 0.4kV side low-voltage incoming line frame circuit breaker and bus tie circuit breaker setting parameters, reactive power capacitor compensation parameters, and active filter device parameters. If there are any parameters that are not suitable, they will be displayed in the error information prompt table in the interface, and a pop-up window will alert the designer to pay attention to such issues. Finally, the designer decides whether to design according to the common data or insist on the parameters in the current scheme due to special circumstances in this project.

[0196] S62, check the integrity of the target outgoing line circuit corresponding to the target switch module number, and generate a second check result.

[0197] In the embodiment of the present application, the integrity of the outgoing line circuit refers to the consistency of the actual configuration (number, connection relationship, functional state, etc.) of the target outgoing line circuit with the design requirements or preset standards, and whether the circuit itself has complete and effective working conditions.

[0198] The second check result refers to the result of checking the integrity of the target outgoing line circuit corresponding to the target switch module number.

[0199] Integrity check of outgoing line circuit:

[0200] Check whether all low-voltage outgoing line switches in the scheme are correctly arranged. First, compare all outgoing line switches in the scheme with the data in the load statistical allocation table to confirm whether all outgoing line circuits in the load statistical allocation table are arranged in the scheme without missing items;

[0201] Secondly, all outgoing line circuits have been allocated to transformer 1 or transformer 2 in the load statistical allocation table, the drawing assistant reads the outgoing line circuit allocation in the final scheme and the data source as a comparison to prevent the mistake of setting a circuit to transformer 1 power supply but changing to transformer 2 power supply due to improper operation, thereby ensuring the relative balance of the load rate of the transformer;

[0202] Thirdly, after the above checks, the drawing assistant will also compare all circuits supplied by transformer 1 and transformer 2 with each other, so as to screen out the case of repeated planning of a certain outgoing line circuit being supplied by both transformer 1 and transformer 2;

[0203] Finally, after layer-by-layer checking, if there is a problem, it will be displayed in the error information prompt table of the interface, in order to facilitate the designer to find the circuit where the problem is located, the first column of the table shows whether the error type is switch missing, switch misplacement or switch repetition, and the error description will tell the designer which switch of which outgoing line cabinet has the problem.

[0204] S63, check the preset outgoing line circuit standby rate, and generate a third check result.

[0205] In the embodiment of the application, the third check result refers to the result of checking the preset outgoing line circuit standby rate.

[0206] Standby rate check:

[0207] The main purpose is to check whether the standby rate in the scheme meets the 20% setting requirement. Since the specific requirements of the switch standby rate for the power supply company in different places are slightly different, the drawing assistant will calculate the standby rate according to the size of the shell current of the switch (specifically represented as 1 module, 2 module or 4 module), and then calculate the total standby rate of the standby switch in the scheme. If the standby rate of the switch with a certain shell current is lower than the set value, the drawing assistant will prompt the designer in the error information table.

[0208] S64, calculate the sum of all setting currents of the outgoing line switch corresponding to the outgoing line cabinet, and check all the sum of the setting currents, and generate a fourth check result.

[0209] In the embodiment of the present application, the electrical cabinet refers to the overall electrical system characteristics constituted by the parameters and connection relationships of the outgoing line cabinet (such as a low-voltage switch cabinet) and various electrical elements (such as circuit breakers, compensation devices, etc.) inside the outgoing line cabinet in the substation to be designed, which is a comprehensive electrical property reflecting the operation state, protection logic and functional matching of the cabinet and internal elements.

[0210] The sum of all setting currents of the outgoing line switches installed in the low-voltage outgoing line cabinet.

[0211] The fourth verification result refers to the result of verifying the sum of all setting currents of the outgoing line cabinet.

[0212] Verification:

[0213] The drawing assistant will also perform electrical verification on the switch arrangement in the scheme. Since the longitudinal bus width of a single low-voltage outgoing line cabinet (commonly used cabinet type MNS) is limited, if the sum of all setting currents of the outgoing line switches installed in the low-voltage outgoing line cabinet is greater than 2000A, some manufacturers cannot produce it in terms of technology, and it also needs to be avoided in design. When the drawing assistant judges that there is such a situation, it will also report an error to notify the designer to pay attention and modify. Therefore, the sum of all setting currents of the outgoing line switches needs to be less than the sum of the physical bus current of the cabinet.

[0214] S65, save the parameter information or / and setting information corresponding to the first verification result, the second verification result, the third verification result and the fourth verification result respectively.

[0215] In the embodiment of the present application, if the first verification result, the second verification result, the third verification result and the fourth verification result do not have problems after the drawing assistant software performs self-checking after clicking the "Verification" button, the self-checking is passed, then the "Save" button is in a clickable state, and after clicking the "Save" button, the drawing assistant saves all parameters and setting information, and at this time, the drawing button on the page becomes a clickable state.

[0216] S66, generate a system construction drawing of the substation to be designed according to the parameter information or / and setting information data.

[0217] In the embodiment of the present application, the system construction drawing refers to the professional engineering drawing for guiding the construction of the substation, the installation of equipment and the system debugging, which is drawn based on the core parameter information (such as voltage level, capacity, load characteristics, etc.) and specific setting information (such as equipment selection, layout planning, wiring mode, etc.) of the substation.

[0218] Clicking the button of drawing system diagram, a construction drawing of a system diagram of the project is directly generated in CAD, including the high-voltage incoming line part, the transformer part and the low-voltage outgoing line part. Clicking the button of drawing order drawing, an order drawing of 0.4kV equipment arrangement of the project is directly generated in CAD, wherein the arrangement of the order drawing of the outgoing line cabinet part is strictly consistent with all loops in the system diagram. Clicking the button of drawing plan, a typical substation plan is generated in CAD, serving as a reference for the designer. Thus, the work of the drawing assistant assisting the designer in drawing the substation of the user is completed.

[0219] Please refer to Figure 14 , Figure 14 A structure block diagram of a substation design system provided for the second embodiment of the present application.

[0220] The substation design system provided by the present application is applied to a drawing assistant software and comprises:

[0221] The obtaining module 201 is configured to obtain outgoing loop information of a substation to be designed and determine transformers of each outgoing loop and load rates of the transformers according to the outgoing loop information.

[0222] The equipment parameter module 202 is configured to determine equipment parameters adapted to the transformers based on the transformers and the load rates of the transformers.

[0223] The extraction module 203 is configured to extract a target outgoing loop quantity and a target switch module number of each transformer from the outgoing loop information, and calculate an outgoing cabinet quantity of the substation to be designed by using a preset outgoing loop standby rate, a preset low-voltage outgoing cabinet body module number, the target outgoing loop quantity and the target switch module number.

[0224] The distribution module 204 is configured to distribute all outgoing loops of the transformers according to a preset distribution rule, and place each outgoing loop and a standby loop in an outgoing cabinet of the substation to be designed according to a distribution result.

[0225] The checking module 205 is configured to check the load rates, the equipment parameters, the target outgoing loop quantity, the target switch module number, the preset outgoing loop standby rate and a cabinet body corresponding to the outgoing cabinet, respectively, and generate a system construction drawing of the substation to be designed according to a checking result.

[0226] Further, the obtaining module 201 comprises:

[0227] The filling sub-module is configured to fill each outgoing loop information in a load statistics distribution table according to a project requirement of the substation to be designed.

[0228] The current calculation sub-module is configured to calculate a calculation current of each outgoing loop in the outgoing loop information.

[0229] a selection submodule configured to select a setting current of an outgoing line switch of the substation to be designed according to the calculated current;

[0230] a loop information submodule configured to generate loop information of the substation to be designed by using a loop number, a load name, a device capacity, a required coefficient, a calculated current and a setting current of each outgoing line loop;

[0231] a load rate submodule configured to determine a transformer corresponding to each outgoing line loop and a load rate of the transformer according to the outgoing line loop information.

[0232] Further, the device parameter module 202 comprises:

[0233] a reading submodule configured to read a load statistics distribution table;

[0234] a device parameter submodule configured to select a device parameter suitable for each transformer by the load rate of each transformer based on the load statistics distribution table and a preset design requirement; wherein the device parameter comprises a high-voltage incoming line cable parameter, a transformer-side low-voltage incoming line frame circuit breaker and bus tie circuit breaker parameter, a reactive power capacitor compensation parameter and an active filter device parameter.

[0235] Further, the system further comprises:

[0236] a selection submodule configured to select a voltage level, a high-voltage cabinet type and a metering mode of the substation to be designed from a high-voltage part setting page of the drawing assistant software according to a preset power supply scheme;

[0237] a layout submodule configured to determine a transformer layout form corresponding to the substation to be designed according to a preset project building reserved space.

[0238] Further, the extraction module 203 comprises:

[0239] an extraction submodule configured to extract an initial outgoing line loop number and an initial switch module number of each transformer from the outgoing line loop information;

[0240] a judgment submodule configured to judge whether the initial outgoing line loop number and the initial switch module number meet a preset low-voltage outgoing line loop distribution reasonable range;

[0241] an adjustment submodule configured to, if not, adjust the initial outgoing line loop number and the initial switch module number, generate a new initial outgoing line loop number and a new initial switch module number, and jump to execute the step of judging whether the new initial outgoing line loop number and the new initial switch module number meet the preset low-voltage outgoing line loop distribution reasonable range;

[0242] a switch module number submodule configured to, if yes, determine the initial outgoing line loop number and the initial switch module number as a target outgoing line loop number and a target switch module number;

[0243] The outlet cabinet quantity sub-module is used for calculating the outlet cabinet quantity of the substation to be designed by using the preset outlet circuit standby rate, the preset low-voltage outlet cabinet module, the target outlet circuit quantity and the target switch module.

[0244] Further, the distribution module 204 comprises:

[0245] The classification sub-module is used for classifying all outlet circuits of each transformer according to different transformers to generate outlet circuits of multiple transformers.

[0246] The arrangement sub-module is used for arranging the outlet cabinets where each load is located according to a preset load level order.

[0247] The placement sub-module is used for arranging each load level according to a switch setting value sorting rule of the outlet circuit, and placing the load corresponding to each load level in the corresponding outlet cabinet.

[0248] The outlet cabinet sub-module is used for placing each outlet circuit and standby circuit in each outlet cabinet according to a preset placement rule.

[0249] Further, the verification module 205 comprises:

[0250] The first verification sub-module is used for verifying the load rate and the device parameters of each transformer to generate a first verification result.

[0251] The second verification sub-module is used for verifying the integrity of the outlet circuit corresponding to the target outlet circuit quantity and the target switch module to generate a second verification result.

[0252] The third verification sub-module is used for verifying the preset outlet circuit standby rate to generate a third verification result.

[0253] The calculation sub-module is used for calculating the sum of all setting currents of the outlet switch corresponding to the outlet cabinet, and verifying the sum of all setting currents to generate a fourth verification result.

[0254] The saving sub-module is used for saving the parameter information or / and setting information corresponding to the first verification result, the second verification result, the third verification result and the fourth verification result.

[0255] The construction drawing sub-module is used for generating the system construction drawing of the substation to be designed according to the parameter information or / and setting information data.

[0256] Embodiment three of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed to realize the substation design method of any embodiment of the present application.

[0257] Embodiment four of the present application provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein the program instructions, when executed by a computer, cause the computer to perform the substation design method of any embodiment of the present application.

[0258] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0259] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0260] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0261] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0262] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the entire or part of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0263] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A substation design method, characterized by, The application is applied to a drawing assistant software, comprising: Obtaining outgoing line circuit information of a substation to be designed, and determining transformers of each outgoing line circuit and load rates of each transformer according to the outgoing line circuit information; Determining device parameters matched with each transformer based on each transformer and the load rates of each transformer; Extracting a target outgoing line circuit quantity and a target switch module of each transformer from the outgoing line circuit information, and calculating an outgoing cabinet quantity of the substation to be designed by using a preset outgoing line circuit backup rate, a preset low-voltage outgoing line cabinet module, the target outgoing line circuit quantity and the target switch module, comprising: Extracting an initial outgoing line circuit quantity and an initial switch module of each transformer from the outgoing line circuit information; Determining whether the initial outgoing line circuit quantity and the initial switch module conform to a preset low-voltage outgoing line circuit distribution reasonable range; If not, adjusting the initial outgoing line circuit quantity and the initial switch module to generate new initial outgoing line circuit quantity and initial switch module, and jumping to execute the step of determining whether the initial outgoing line circuit quantity and the initial switch module conform to the preset low-voltage outgoing line circuit distribution reasonable range; If yes, determining the initial outgoing line circuit quantity and the initial switch module as the target outgoing line circuit quantity and the target switch module; Calculating the outgoing cabinet quantity of the substation to be designed by using the preset outgoing line circuit backup rate, the preset low-voltage outgoing line cabinet module, the target outgoing line circuit quantity 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 backup circuit in an outgoing cabinet of the substation to be designed according to an allocation result; Respectively checking the load rate, the device parameters, the target outgoing line circuit quantity, the target switch module, the preset outgoing line circuit backup rate and a cabinet body corresponding to the outgoing cabinet according to a checking result, and generating a system construction drawing of the substation to be designed.

2. The substation design method of claim 1, wherein The step of obtaining outgoing line circuit information of a substation to be designed, and determining transformers of each outgoing line circuit and load rates of each transformer according to the outgoing line circuit information, comprises: Filling each outgoing line circuit information in a load statistics allocation table according to project requirements of the substation to be designed; Calculating a calculation current of each outgoing line circuit in the outgoing line circuit information; Selecting a setting current of an outgoing switch of the substation to be designed according to the calculation current; Generating circuit information of the substation to be designed by using a circuit number, a load name, a device capacity, a required coefficient, a calculation current and a setting current of each outgoing line circuit; Determining transformers corresponding to each outgoing line circuit and load rates of the transformers according to the outgoing line circuit information.

3. The substation design method of claim 2, wherein, The step of determining device parameters matched with each transformer based on each transformer and the load rates of each transformer, comprises: Reading the load statistics allocation table; The device parameters include high-voltage incoming line cable parameters, transformer-side low-voltage incoming line frame circuit breaker and bus tie circuit breaker parameters, reactive power capacitor compensation parameters, and active filter device parameters.

4. The substation design method of claim 1, wherein Also comprising: According to a preset power supply scheme, selecting the voltage level, high-voltage cabinet type, and metering mode of the substation to be designed from a high-voltage part setting page of the drawing assistant software; According to a preset project building reserved space, determining the transformer arrangement form corresponding to the substation to be designed.

5. The substation design method of claim 1, wherein According to a preset distribution rule, distributing all outgoing line loops of each transformer, and placing each outgoing line loop and standby loop in an outgoing line cabinet of the substation to be designed according to the distribution result, comprising: According to different transformers, classifying all outgoing line loops of each transformer to generate multiple outgoing line loops of the transformer; According to a preset load level order, arranging the outgoing line cabinets where each load is located; According to a switch setting value sorting rule of the outgoing line loop, arranging each load level, and placing the load corresponding to each load level in the corresponding outgoing line cabinet; According to a preset placement rule, placing each outgoing line loop and standby loop in each outgoing line cabinet.

6. The substation design method of claim 1, wherein According to the load rate, the device parameters, the target outgoing line loop quantity, the target switch module, the preset outgoing line loop standby rate, and the cabinet body electricity corresponding to the outgoing line cabinet, generating a system construction drawing of the substation to be designed according to the verification result, comprising: Verifying the load rate and device parameters of each transformer to generate a first verification result; Verifying the outgoing line loop integrity corresponding to the target outgoing line loop quantity 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 setting currents of the outgoing line switch corresponding to the outgoing line cabinet, and verifying all the sum of the setting currents to generate a fourth verification result; Saving the parameter information or / and setting information corresponding to the first verification result, the second verification result, the third verification result, and the fourth verification result, respectively; According to the parameter information or / and the setting information, generating a system construction drawing of the substation to be designed.

7. A substation design system for implementing the method of claim 1, characterized by Applied to a drawing assistant software, comprising: An acquisition module is configured to acquire outgoing line loop information of a substation to be designed, and determine a transformer of each outgoing line loop and a load rate of each transformer according to the outgoing line loop information; A device parameter module is configured to determine device parameters adapted to each transformer based on each transformer and the load rate of each transformer; An extraction module is configured to extract a target outgoing line loop quantity and a target switch module of each transformer from the outgoing line loop information, and calculate a number of outgoing line cabinets of the substation to be designed by using a preset outgoing line loop standby rate, a preset low-voltage outgoing line cabinet module, the target outgoing line loop quantity, and the target switch module. an allocation module configured to allocate all outgoing line circuits of each transformer according to a preset allocation rule, and place each outgoing line circuit and a standby circuit in an outgoing line cabinet of the substation to be designed according to an allocation result; a verification module configured to respectively verify the load rate, the equipment parameter, the target number of outgoing line circuits, the target switch module number, the preset standby rate of outgoing line circuits, and a cabinet body corresponding to the outgoing line cabinet, and generate a system construction drawing of the substation to be designed according to a verification result.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed, implements the substation design method according to any one of claims 1-6.

9. A computer program product, characterised in that, The computer program product comprises a computer program stored on a non-transitory computer-readable storage medium, and the computer program comprises 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 1-6.

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