Method and device for selecting cable cross-sectional area, terminal equipment and storage medium

Abstract

The application discloses a cable cross-section area selection method and device, a terminal equipment and a storage medium, and comprises the following steps: obtaining the target current, the target length and the target power factor of a target cable; generating a first product corresponding to the target power factor according to the target current and the target length; comparing the first product with a plurality of critical values corresponding to the target power factor, determining two critical values with the minimum difference value from the first product, and taking the critical value with the larger value from the two critical values as a target critical value; obtaining the cable cross-section area corresponding to the target critical value, and taking the cable cross-section area as the target cross-section area of the target cable. According to the application, different critical values corresponding to the cross-section area can be calculated under different power reference values, and finally, when the product value of the current value and the length value of the target cable is calculated, the target cross-section area obtained by comparing the product value with the critical value is more accurate.

Description

Technical Field

[0001] This invention relates to the field of cable cross-section selection technology, and in particular to a method, apparatus, terminal equipment, and storage medium for selecting cable cross-section area. Background Technology

[0002] Power plants contain numerous electrical installations, which are crucial for the normal operation and control of the entire plant. Therefore, the selection of power cables for these installations is extremely important. Inaccurate selection will directly affect the normal operation of the installations, and consequently, the operation and control of process equipment. In special circumstances, malfunctioning electrical installations may cause major power plant equipment to trip, resulting in significant economic and property losses.

[0003] The selection of the cross-section of power cables for electric actuators is influenced by numerous factors, including the actuator's normal operating power, normal operating current, power parameters, mechanical efficiency, cable length, and operating temperature. In practical engineering applications, engineers often do not consider so many factors, but rather rely on the actuator's rated current, rated power, or cable length to calculate a rough range of suitable cross-sections for the power cable.

[0004] Voltage drop is caused by cable losses. The longer the cable and the smaller the cross-sectional area, the greater the cable loss. Excessive loss leads to a large voltage drop, preventing the equipment from functioning properly. In engineering design, 5% of the three-phase voltage is used as a critical value for judgment and selection. In actual selection, because the cable length for powering the equipment is relatively fixed on-site, if the calculated loss is too high, the cross-sectional area of ​​the cable can be increased to reduce the voltage drop. Electrical equipment in our country uses both single-phase and three-phase voltage. Single-phase voltage is 220V, while three-phase voltage, used in industrial applications, is 380V.

[0005] Current technology for selecting cable cross-sections for electric actuators primarily involves calculating the line voltage drop based on the cable's rated current, using 5% of the three-phase voltage as a critical value. (where U is the total voltage, I is the operating current in A, ρ is the resistivity, L is the cable length in meters, and S is the cable cross-section in mm²), thus determining S as the cross-sectional area of ​​the cable; however, this calculation method does not take into account the influence of the actual power factor of the electric device on the final cross-sectional area selection, resulting in an inaccurate final cross-sectional area calculation result. Summary of the Invention

[0006] This invention provides a method, apparatus, terminal device, and storage medium for selecting cable cross-sectional area, which can effectively solve the problem that the existing technology does not consider the influence of the actual power factor of the cable on the final cross-sectional area selection, resulting in an inaccurate cross-sectional area calculation result, and effectively improve the accuracy of cross-sectional area selection.

[0007] One embodiment of the present invention provides a method for selecting the cross-sectional area of ​​a cable, comprising:

[0008] Obtain the target current, target length, and target power factor of the target cable;

[0009] A first product is generated based on the target current and the target length;

[0010] The first product is compared with multiple critical values ​​corresponding to the target power factor to determine the two critical values ​​with the smallest difference from the first product. The critical value with the larger critical value among the two critical values ​​is taken as the target critical value. Each critical value corresponds to a cable cross-sectional area. Each critical value is calculated based on the corresponding operating voltage, power factor, impedance, and inductive reactance.

[0011] Obtain the cable cross-sectional area corresponding to the target critical value, and use the cable cross-sectional area as the target cross-sectional area of ​​the target cable.

[0012] Preferably, each critical value is calculated based on the corresponding operating voltage, power factor, impedance, and inductive reactance, specifically including:

[0013] Obtain the cable cross-sectional area corresponding to a critical value;

[0014] The operating voltage, power factor, impedance, and inductive reactance corresponding to a critical value are determined based on the cable cross-sectional area corresponding to that critical value.

[0015] The voltage drop is obtained by multiplying the operating voltage by a preset percentage.

[0016] The critical value is calculated based on voltage drop, operating voltage, power factor, impedance, and inductive reactance.

[0017] Preferably, the calculation of the critical value based on voltage drop, operating voltage, power factor, impedance, and inductive reactance specifically includes:

[0018] The critical value is obtained according to the first formula; the first formula is:

[0019] ;

[0020] in, This is the critical value. The first preset parameter, For voltage drop, This is the second preset parameter. For impedance, First power factor, It is the second power factor; Operating voltage;

[0021] Preferably, obtaining the target current of the target cable specifically includes:

[0022] Obtain the target operating power of the target cable Target operating voltage and target mechanical efficiency factor;

[0023] The target current of the target cable is calculated according to the second formula; the second formula is:

[0024] ;

[0025] in, For the target current, For the target operating power, This is the third preset parameter. For the target operating voltage, The target mechanical efficiency factor, It is the first power factor.

[0026] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments.

[0027] An embodiment of the present invention provides a cable cross-sectional area selection device, comprising: a numerical acquisition module, a product calculation module, a target critical numerical acquisition module, and a target cross-sectional area acquisition module;

[0028] The numerical acquisition module is used to acquire the target current, target length, and target power factor of the target cable;

[0029] The product calculation module is used to generate a first product based on the target current and the target length;

[0030] The target critical value acquisition module is used to compare the first product with multiple critical values ​​corresponding to the target power factor, determine the two critical values ​​with the smallest difference from the first product, and take the critical value with the larger critical value as the target critical value; wherein, each critical value corresponds to a cable cross-sectional area; each critical value is calculated based on the corresponding operating voltage, power factor, impedance and inductive reactance;

[0031] The target cross-sectional area acquisition module is used to acquire the cable cross-sectional area corresponding to the target critical value, and use the cable cross-sectional area as the target cross-sectional area of ​​the target cable.

[0032] Preferably, each critical value is calculated based on the corresponding power factor, impedance, and inductive reactance values, specifically including:

[0033] Obtain the cable cross-sectional area corresponding to a critical value;

[0034] The operating voltage, power factor, impedance, and inductive reactance corresponding to a critical value are determined based on the cable cross-sectional area corresponding to that critical value.

[0035] The voltage drop is obtained by multiplying the operating voltage by a preset percentage.

[0036] The critical value is calculated based on voltage drop, operating voltage, power factor, impedance, and inductive reactance.

[0037] Preferably, the critical value is calculated based on voltage drop, operating voltage, power factor, impedance, and inductive reactance, specifically including:

[0038] The critical value is obtained according to the first formula; the first formula is:

[0039] ;

[0040] in, This is the critical value. The first preset parameter, For voltage drop, This is the second preset parameter. For impedance, First power factor, It is the second power factor; Operating voltage;

[0041] Preferably, the value acquisition module is used to acquire the target current of the target cable, specifically including:

[0042] Obtain the target operating power of the target cable Target operating voltage and target mechanical efficiency factor;

[0043] The target current of the target cable is calculated according to the second formula; the second formula is:

[0044] ;

[0045] in, For the target current, For the target operating power, This is the third preset parameter. For the target operating voltage, The target mechanical efficiency factor, It is the first power factor.

[0046] Based on the above method embodiments, the present invention provides corresponding terminal device embodiments.

[0047] A terminal device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the above-described method for selecting the cross-sectional area of ​​a cable.

[0048] Based on the above method embodiments, the present invention provides corresponding storage medium embodiments.

[0049] A storage medium comprising a stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform the aforementioned method for selecting the cross-sectional area of ​​a cable.

[0050] The following benefits can be obtained by implementing the present invention:

[0051] This invention provides a method, apparatus, terminal device, and storage medium for selecting cable cross-sectional area. The method involves obtaining the current and length values ​​of a target cable, multiplying them to obtain a product, and comparing this product with multiple critical values ​​corresponding to the power reference value of the target cable to obtain a target critical value. The target cross-sectional area corresponding to this target critical value is then used as the cross-sectional area of ​​the target cable. These multiple critical values ​​are pre-calculated based on the power factor, impedance, and inductive reactance values ​​of the target cable. For the same power, different critical values ​​correspond to different cross-sectional areas. This invention comprehensively considers the actual power factor of the electric device when calculating the critical values ​​corresponding to the cross-sectional area. This allows for the calculation of multiple critical values ​​corresponding to multiple cross-sectional areas for the cable of the electric device under different power reference values. This makes the final target cross-sectional area obtained by comparing the product value calculated from the current and length values ​​of the target cable with the critical values ​​more accurate. Attached Figure Description

[0052] Figure 1 This is a flowchart illustrating a method for selecting the cross-sectional area of ​​a cable according to an embodiment of the present invention.

[0053] Figure 2 This is a schematic diagram of a cable cross-sectional area selection device provided in an embodiment of the present invention. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] See Figure 1 This is a flowchart illustrating a method for selecting the cross-sectional area of ​​a cable according to an embodiment of the present invention.

[0056] An embodiment of the present invention provides a method for selecting the cross-sectional area of ​​a cable, comprising:

[0057] Step S1: Obtain the target current, target length, and target power factor of the target cable;

[0058] Step S2: Generate a first product based on the target current and the target length;

[0059] Step S3: Compare the first product with multiple critical values ​​corresponding to the target power factor, determine the two critical values ​​with the smallest difference from the first product, and take the critical value with the larger critical value as the target critical value; wherein, each critical value corresponds to a cable cross-sectional area; each critical value is calculated based on the corresponding operating voltage, power factor, impedance and inductive reactance;

[0060] Step S4: Obtain the cable cross-sectional area corresponding to the target critical value, and use the cable cross-sectional area as the target cross-sectional area of ​​the target cable.

[0061] In a preferred embodiment, step S1, obtaining the target current of the target cable, further includes:

[0062] Obtain the target operating power, third preset parameter, target operating voltage, target mechanical efficiency factor, and target power factor of the target cable; the target power factor includes the first power factor. Second power factor ;

[0063] The target current of the target cable is calculated according to the second formula; the second formula is:

[0064] ;

[0065] in, For the target current, For the target operating power, This is the third preset parameter. For the target operating voltage, The target mechanical efficiency factor, It is the first power factor.

[0066] Among them, the third preset parameter The value can be adjusted according to the actual situation. In a preferred embodiment, the third preset parameter... Then the second formula can be:

[0067] .

[0068] It should be noted that there are two ways to determine the target current in this invention. One is to directly obtain the user's input current value, and the other is to obtain the user's input target operating power, third preset parameter, target operating voltage, target mechanical efficiency factor and target power factor and obtain the current value through the second formula.

[0069] The purpose of this embodiment is to obtain the target power product based on the two parameters of current and length in step S2, and then find the target cross-sectional area through the product.

[0070] For step S2, in a preferred embodiment, generating a first product based on the target current and the target length specifically includes:

[0071] The target current and target length are multiplied to obtain a product value. The purpose of this product value is to compare it with the critical value corresponding to the target power factor in order to find a critical value that is close to the product value.

[0072] For step S3, in a preferred embodiment, the first product is compared with multiple critical values ​​corresponding to the target power factor, and the two critical values ​​with the smallest difference from the first product are determined. The critical value with the larger critical value among the two critical values ​​is taken as the target critical value. Specifically, this includes:

[0073] By calculating the product of the target current and the target length, the product is compared with multiple critical values ​​corresponding to the target power. After finding the two critical values ​​with the smallest difference from the product, the larger of the two critical values ​​is taken as the target critical value obtained this time.

[0074] In a preferred embodiment, each critical value corresponds to a cable cross-sectional area; specifically, under the same power factor, different critical values ​​correspond to different cable cross-sectional areas; and the target cable has multiple power factors, and each critical value of each power factor corresponds to a cable cross-sectional area.

[0075] In a preferred embodiment, each critical value is calculated based on the corresponding operating voltage, power factor, impedance, and inductive reactance; specifically including:

[0076] Obtain the operating voltage corresponding to a cross-sectional area of ​​the target cable. Power factor, impedance and resistance ;

[0077] In one preferred embodiment, the operating voltage is a three-phase voltage, which is 380V and is used in industrial applications;

[0078] The operating voltage Multiply by a preset percentage to get the voltage drop. In a preferred embodiment, the preset percentage is five percent, i.e., voltage drop. The calculation formula is: Among them, when the voltage drops to five percent of the operating voltage, the equipment can be put into normal operation.

[0079] Based on voltage drop Operating voltage Power factor, impedance and resistance The critical value was calculated. Specifically, it includes:

[0080] Get the first preset parameters Second preset parameters ;

[0081] The critical value is obtained according to the first formula; the first formula is:

[0082] ;

[0083] in, This is the critical value. The first preset parameter, For voltage drop, This is the second preset parameter. For impedance, First power factor, It is the second power factor; Operating voltage;

[0084] Among them, the first preset parameter Second preset parameters It can be adjusted according to the actual situation. In a preferred embodiment, the first preset parameter... Second preset parameter Then the first formula can be:

[0085] .

[0086] As can be seen from the first formula above, when calculating the critical value, the influence of factors such as voltage drop, operating voltage, power factor, impedance and inductive reactance of the target cable is fully considered, which reduces the calculation results of the critical value and makes the cross-sectional area corresponding to the critical value more accurate, and makes the obtained cable cross-sectional area more in line with the actual operating requirements.

[0087] Different cable sheath types will result in different parameters, meaning that impedance and reactance will differ for the same power, leading to different critical values ​​calculated for the same power.

[0088] When the target power factor is set to 0.8, the corresponding critical values ​​for the target power are shown in the table below:

[0089]

[0090] As shown in the table above, when the power factor is the same, different critical values ​​correspond to different cross-sectional areas. After comparing the product value with the critical value to obtain the target critical value, the corresponding cross-sectional area can be selected.

[0091] Specifically, when the product value is 1.2 and the target power factor is 0.8, two critical values ​​with the smallest difference from the product value can be obtained, namely 0.98 and 1.62. The larger critical value, 1.62, is taken as the target critical value.

[0092] For step S4, obtaining the cable cross-sectional area corresponding to the target critical value and using the cable cross-sectional area as the target cross-sectional area of ​​the target cable specifically includes:

[0093] The target critical value can be used to determine the cable cross-sectional area corresponding to that target critical value under the target power parameters. From the example above, we can see that when the critical value is 1.62 and the target power factor is 0.8, the cross-sectional area corresponding to the critical value of 1.62 is 2.5 mm². 2 That is, the target cross-sectional area is 2.5 mm². 2 .

[0094] This invention obtains the final cross-sectional area selection by multiplying the two variables of current and length and comparing the product value with a critical value. This achieves automatic matching of the actual cross-sectional area based on current and length, reducing the calculation intensity and workload of designers and improving the efficiency of cross-sectional area selection.

[0095] like Figure 2 As shown, based on the above embodiments of the cable cross-sectional area selection methods, the present invention provides corresponding device embodiments;

[0096] An embodiment of the present invention provides a cable cross-sectional area selection device, comprising: a numerical acquisition module, a product calculation module, a target critical numerical acquisition module, and a target cross-sectional area acquisition module;

[0097] The numerical acquisition module is used to acquire the target current, target length, and target power factor of the target cable;

[0098] The product calculation module is used to generate a first product based on the target current and the target length;

[0099] The target critical value acquisition module is used to compare the first product with multiple critical values ​​corresponding to the target power factor, determine the two critical values ​​with the smallest difference from the first product, and take the critical value with the larger critical value as the target critical value; wherein, each critical value corresponds to a cable cross-sectional area; each critical value is calculated based on the corresponding operating voltage, power factor, impedance and inductive reactance;

[0100] The target cross-sectional area acquisition module is used to acquire the cable cross-sectional area corresponding to the target critical value, and use the cable cross-sectional area as the target cross-sectional area of ​​the target cable.

[0101] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0102] Those skilled in the art will clearly understand that, for convenience and simplicity, the specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0103] Based on the above embodiments of various cable cross-sectional area selection methods, the present invention provides corresponding embodiments of terminal equipment.

[0104] One embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a method for selecting the cross-sectional area of ​​a cable as described in any embodiment of the present invention.

[0105] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0106] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0107] The memory can be used to store the computer program. The processor implements various functions of the terminal device by running or executing the computer program stored in the memory and calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc.; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0108] Based on the above embodiments of various cable cross-sectional area selection methods, the present invention provides corresponding embodiments for storage media.

[0109] One embodiment of the present invention provides a storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute a cable cross-sectional area selection method according to any embodiment of the present invention.

[0110] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0111] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for selecting the cross-sectional area of ​​a cable, characterized in that, include: Obtain the target current, target length, and target power factor of the target cable; A first product is generated based on the target current and the target length; The first product is compared with multiple critical values ​​corresponding to the target power factor to determine the two critical values ​​with the smallest difference from the first product. The critical value with the larger critical value among the two critical values ​​is taken as the target critical value. Each critical value corresponds to a cable cross-sectional area. Each critical value is calculated based on the corresponding operating voltage, power factor, impedance, and inductive reactance. Obtain the cable cross-sectional area corresponding to the target critical value, and use the cable cross-sectional area as the target cross-sectional area of ​​the target cable; Each critical value is calculated based on the corresponding operating voltage, power factor, impedance, and inductive reactance, specifically including: Obtain the cable cross-sectional area corresponding to a critical value; The operating voltage, power factor, impedance, and inductive reactance corresponding to a critical value are determined based on the cable cross-sectional area corresponding to that critical value. The voltage drop is obtained by multiplying the operating voltage by a preset percentage. The critical value is calculated based on voltage drop, operating voltage, power factor, impedance, and inductive reactance. The critical values ​​calculated based on voltage drop, operating voltage, power factor, impedance, and inductive reactance specifically include: The critical value is obtained according to the first formula; the first formula is: ； in, This is the critical value. The first preset parameter, For voltage drop, This is the second preset parameter. For impedance, First power factor, It is the second power factor; Operating voltage; Obtaining the target current of the target cable specifically includes: Obtain the target operating power, target operating voltage, and target mechanical efficiency factor of the target cable; The target current of the target cable is calculated according to the second formula; the second formula is: ； in, For the target current, For the target operating power, This is the third preset parameter. For the target operating voltage, The target mechanical efficiency factor, It is the first power factor.

2. A device for selecting the cross-sectional area of ​​a cable, characterized in that, include: Numerical acquisition module, product calculation module, target critical numerical acquisition module, and target cross-sectional area acquisition module; The numerical acquisition module is used to acquire the target current, target length, and target power factor of the target cable; The product calculation module is used to generate a first product based on the target current and the target length; The target critical value acquisition module is used to compare the first product with multiple critical values ​​corresponding to the target power factor, determine the two critical values ​​with the smallest difference from the first product, and take the critical value with the larger critical value as the target critical value; wherein, each critical value corresponds to a cable cross-sectional area; each critical value is calculated based on the corresponding operating voltage, power factor, impedance and inductive reactance; The target cross-sectional area acquisition module is used to acquire the cable cross-sectional area corresponding to the target critical value, and use the cable cross-sectional area as the target cross-sectional area of ​​the target cable; Each critical value is calculated based on the corresponding operating voltage, power factor, impedance, and inductive reactance, specifically including: Obtain the cable cross-sectional area corresponding to a critical value; The operating voltage, power factor, impedance, and inductive reactance corresponding to a critical value are determined based on the cable cross-sectional area corresponding to that critical value. The voltage drop is obtained by multiplying the operating voltage by a preset percentage. The critical value is calculated based on voltage drop, operating voltage, power factor, impedance, and inductive reactance. The critical values ​​calculated based on voltage drop, operating voltage, power factor, impedance, and inductive reactance specifically include: The critical value is obtained according to the first formula; the first formula is: in, This is the critical value. The first preset parameter, For voltage drop, This is the second preset parameter. For impedance, First power factor, It is the second power factor; Operating voltage; Obtaining the target current of the target cable specifically includes: Obtain the target operating power, target operating voltage, and target mechanical efficiency factor of the target cable; The target current of the target cable is calculated according to the second formula; the second formula is: ； in, For the target current, For the target operating power, This is the third preset parameter. For the target operating voltage, The target mechanical efficiency factor, It is the first power factor.

3. A terminal device, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement a method for selecting the cross-sectional area of ​​a cable as described in claim 1.

4. A storage medium, characterized in that, The storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device where the storage medium is located to perform a cable cross-sectional area selection method as described in claim 1.

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