CN114357776A - Method and device for determining voltage drop for building electrical design and computer readable storage medium - Google Patents
Method and device for determining voltage drop for building electrical design and computer readable storage medium Download PDFInfo
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Abstract
The application relates to the technical field of building electrical design, in particular to a method for determining power consumption voltage drop for building electrical design, which comprises the following steps of building a BIM structural model of a target building; building a BIM power system model comprising a lead and power equipment based on a BIM structure model of a target building; acquiring a length value of a wire in a BIM power system model; acquiring load calculation current in a BIM power system model by adopting a required coefficient method; calculating current based on load in the BIM power system model, and acquiring a sectional area numerical value of a wire in the BIM power system model; and calculating current, the length, the sectional area and the material of the lead according to the load in the BIM power system model, and determining the voltage drop of the line. The voltage drop of the building electrical line can be simply and effectively calculated.
Description
Technical Field
The present disclosure relates to the field of building electrical design technologies, and in particular, to a method and an apparatus for determining a voltage drop for building electrical design, and a computer-readable storage medium.
Background
The electric energy quality of an electric system refers to voltage, frequency and waveform, and in the electrical design of buildings, the influence on the electric energy quality is mostly concentrated on the voltage, and when the difference between the voltage applied to two ends of electric equipment and the rated voltage of the electric equipment is large, the performance of the electric system is directly influenced. In the case of a motor, when a voltage is reduced, a motor torque is sharply reduced, so that a rotational speed is reduced or stopped, even causing a serious accident, and therefore, when a building electric distribution line is designed, the influence of the voltage drop should be sufficiently considered.
Disclosure of Invention
In order to calculate the line voltage drop simply and effectively, the application provides a method for determining the voltage drop for electrical design of buildings.
In a first aspect, the method for determining the voltage drop for electrical design of a building provided by the application adopts the following technical scheme: the method comprises the following steps:
building a BIM structural model of a target building;
building a BIM power system model comprising a lead and power equipment based on a BIM structure model of a target building;
acquiring a length value of a wire in a BIM power system model;
acquiring load calculation current in a BIM power system model by adopting a required coefficient method;
calculating current based on load in the BIM power system model, and acquiring a sectional area numerical value of a wire in the BIM power system model;
calculating current, length, sectional area and material of a lead according to load in a BIM power system model, and determining voltage drop of a distribution line;
wherein, the current, the length, the sectional area and the material of the lead are calculated according to the load in the BIM power system model, and the step of determining the voltage drop of the line comprises the following steps: obtaining the percentage of voltage drop per 1 A.km of the wire, the percentage of voltage drop and determining the line voltage drop:
firstly, the voltage drop percentage calculation formula of the three-phase balanced load circuit is as follows:
△u1％＝△ua％Il
the voltage drop calculation formula is as follows:
△u1＝Ui*△u1/100
secondly, the percentage calculation formula of the voltage drop of the single-phase load line connected with the phase voltage is as follows,
△u2％≈2△ua％Il
the voltage drop calculation formula is as follows:
△u2＝Up*△u2/100
in the formula, delta ua% voltage drop per 1 A.km of the three-phase line,%/A.km;
△u1percent-percent voltage drop of the three-phase balanced load line,%;
△u2% voltage drop of single-phase load line,%;
△u1-line voltage drop, V, of the three-phase balanced load line;
△u2-line voltage drop, V, of the single-phase load line;
i-load calculation current, A;
l-line length, km;
ui-line voltage, V;
up is the phase voltage, V;
by adopting the technical scheme, the BIM power system model is obtained through visualization, the conducting wires and the power equipment are distributed in the BIM power system model, the load calculation current in the BIM power system model can be calculated by adopting a demand coefficient method, the current is calculated based on the load in the BIM power system model, the sectional area numerical value of the conducting wire is obtained, and the voltage drop of the line can be obtained by combining the length and the sectional area of the conducting wire and the voltage drop percentage (%/A.km) of every 1 A.km of the three-phase line with the load calculation current, so that the voltage drop of the line can be reasonably controlled, and the running stability of the power equipment and the reliability of the power system can be improved.
Optionally, the building model of the BIM power system built based on the BIM structure model of the target building includes:
establishing an electrical family library comprising power equipment and a lead, wherein the power equipment is provided with a plurality of groups of parameter data, and the lead is provided with a plurality of groups of parameter data;
distributing power equipment and wires based on the BIM structural model;
and adjusting the BIM power system model.
By adopting the technical scheme, based on the BIM structural model, the power equipment and the wire which are arranged visually are built, the power equipment and the wire can be accurately and visually placed to the formulated position, and the power equipment and the wire are conveniently and subsequently positioned.
Optionally, the adjusting the BIM power system model includes the steps of:
highlighting unreasonably laid electrical models;
adjusting the power supply distance of a wire in the BIM power system model;
the highlighting lays out in an unreasonable electrical model,
if the wiring trunk line arrangement distance exceeds 250 meters, all the wires and the electric power equipment in the trunk line are represented by red marks; if the wiring trunk line arrangement distance is less than 250 meters, all the wires and the electric power equipment in the trunk line are represented by green marks;
in adjusting the power supply distance of the wires in the BIM power system model,
if the main line of the wire is red marked, the arrangement position of the electric power equipment or the arrangement path of the wire is adjusted, or the arrangement position of the electric power equipment and the arrangement path of the wire are adjusted simultaneously, so that the main line of the wire and the electric power equipment become green marks.
Through adopting above-mentioned technical scheme, show to lay unreasonable wire and power equipment through setting up red sign, set up green sign and show to lay reasonable wire and power equipment, easily designer discerns and adjusts the problem that this BIM electric model exists, has improved the work efficiency of design adjustment BIM.
Optionally, in the obtaining of the length value of the wire in the BIM power system model, when the power equipment and the wire are both green, the length of the wire in the BIM electrical model is determined.
By adopting the technical scheme, the length of the wire is derived through the BIM model, and the obtained data is visual, simple and accurate.
Optionally, the method for obtaining the calculated current in the BIM power system model by using the required coefficient method includes the steps of:
determining the power of the equipment;
acquiring load calculation current of the electric equipment set;
acquiring load calculation current of a power distribution main line;
in the determining of the power of the device,
outputting the rated power of the electric equipment to a BIM electrical family library, and uniformly converting the rated power of the electric equipment with different working systems into the power of a continuous working system; the power of different physical quantities is converted into active power in a unified mode.
Firstly, the power of the equipment for continuously operating the motor is equal to the rated power of the equipment;
secondly, the equipment power of the periodic work system motor is an active power conversion formula which uniformly converts rated power into 100% of load duration rate, and the active power conversion formula is as follows;
Ps-active power, kw, for unity load duration;
Pe-motor power rating, kw;
εN-motor rated load duration;
thirdly, the equipment power of the short-time working motor is converted into the active power of the continuous working motor by the rated power.
Fourthly, the equipment power of the electric welding machine is active power obtained by converting rated capacity into 100 percent of load duration
Ps1-active power at load duration of 100%, kw;
SN-welding machine rated capacity, kVA;
εN-nominal load duration.
Fifthly, the active power of the electric furnace transformer when the equipment power is rated power factor
Ps2-device active power, kw;
SN-rated capacity of the electric furnace transformer, kVA;
εN-nominal load duration.
In the step of obtaining the calculated power of the electric equipment group,
active power: pjs＝KxPs(kW)
Reactive power:
apparent power:
load calculation current:
in the formula: kxCoefficient required for a group of devices, PsA capacity (KW) is provided for the set of devices,
calculating current (A) for the load for the power factor angle of the electric equipment, U for line voltage (V) and I;
in the acquisition of the electrical distribution mains computing load,
active power: pjs＝K∑P∑(KxPs)(KW)
Reactive power:
apparent power:
load calculation current:
in the formula: kxTo the desired coefficient; k∑PAnd K∑QTaking the active coefficient and the reactive coefficient at the same time, and respectively taking the active coefficient and the reactive coefficient at 0.8-0.9 and 0.93-0.97; psThe unit is kW; u is the system nominal voltage (line voltage), kV.
By adopting the technical scheme, the load calculation current in the BIM electrical model is calculated by adopting a required coefficient method according to the adjusted BIM electrical model.
Optionally, in obtaining the numerical value of the sectional area of the wire in the BIM power system model,
selecting a wire section according to a calculation method of heating conditions, wherein the selection mode of the heating conditions is as follows;
Ijs≤In≤Iz
in the formula:
In-fuse melt rated current or circuit breaker rated current or setting current, a;
Ijs-the loop calculates the current, a;
Izthe conductor allows for a continuous current carrying capacity, a.
By adopting the technical scheme, the cross section of the wire is selected by the calculation method according to the heating condition, and the cross section size of the wire matched with the BIM electrical model can be quickly selected only by looking up the industry mark.
Optionally, in the electrical family library established and including the electrical devices and the wires, the electrical devices and the wires are numbered.
Through adopting above-mentioned technical scheme, through numbering power equipment and wire in BIM model, made things convenient for subsequent location and accurate adjustment.
In a second aspect, a device for determining the electricity consumption voltage drop of the building electrical design adopts a method for determining the electricity consumption voltage drop of the building electrical design, and comprises a model module, a database module, a mapping establishing module and a processing module; the database module stores parameter data of the model module, the mapping establishing module is used for mapping the parameter data into the model module, and the processing module is used for calculating the charge load of the model module.
By adopting the technical scheme, the rationality of designing and laying the wires and the power equipment by designers is improved by building the BIM electrical model, the designers can accurately, quickly and intuitively obtain the length of the wires from the BIM electrical model, the load calculation current in the BIM electrical model is calculated by the design by adopting a need coefficient method, the voltage drop of a line is further determined, and the system improves the efficiency of obtaining the voltage drop in the BIM electrical model by the designers.
In a third aspect, a terminal includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor loads and executes the computer program, and the method for determining the voltage drop for electrical design of a building is adopted.
By adopting the technical scheme, the computer program is generated by the construction method and is stored in the memory so as to be loaded and executed by the processor, so that the terminal equipment is manufactured according to the memory and the processor, and the use by a user is facilitated.
In a fourth aspect, a computer-readable storage medium stores a computer program, which when loaded and executed by a processor, implements a method for determining voltage drop for electrical design of a building.
By adopting the technical scheme, the computer program is generated by the construction method and is stored in the computer readable storage medium so as to be loaded and executed by the processor, and the computer program can be conveniently read and stored by the computer readable storage medium.
Drawings
FIG. 1 is a block flow diagram of a method for determining a voltage drop for electrical design of a building according to the present application;
fig. 2 is a block diagram of a process for building a BIM power system model based on a BIM structure model of a target building.
Fig. 3 is a block diagram of a process for obtaining a numerical value of a cross-sectional area of a wire in a BIM power system model according to the present application.
Fig. 4 is a logic block diagram of the voltage drop determination device for electrical design of a building.
1, model module; 2. a database module; 3. a mapping establishing module; 4. and a processing module.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses a method for determining the voltage drop for building electrical design, and with reference to fig. 1, the method for determining the voltage drop for building electrical design comprises the following steps:
step S1: and building a BIM structural model of the target building.
And acquiring a civil engineering drawing of the target building, and performing three-dimensional modeling on the target building by using the REVIT platform to generate a BIM (building information modeling) structural model of the target building.
The BIM structure model comprises structure beam column length information, structure beam column position information, transverse and longitudinal steel structure length information and transverse and longitudinal steel structure position information. Through the construction of the structural beam column and the transverse and longitudinal steel structure, the shape and the size of a target building can be determined.
Step S2: and building a BIM power system model based on the BIM structure model of the target building.
Referring to fig. 2, by building a BIM power system model, the designed power system model is visually displayed, which facilitates more intuitive understanding of the secondary power system model by designers and constructors.
Step S20: and establishing an electrical family library.
The electrical family library comprises electrical equipment and wires, wherein the electrical equipment and the wires are provided with numbers.
For example, the power equipment number is: the first power equipment, the second power equipment and the like are analogized to the power equipment N in sequence; the number of the lead is as follows: and the first lead, the second lead and the like are analogized to the N lead. The power equipment and the wire with numbers facilitate the positioning and related adjustment work of designers.
The power equipment is provided with power equipment parameters and the wire is provided with wire parameters. The power equipment parameters comprise size parameters, performance parameters and load parameters; the wire parameters comprise material parameters, length parameters and sectional area parameters; and the parameters of the power equipment and the parameters of the lead can be modified.
The power equipment comprises a first-level distribution box, a second-level distribution box and a third-level distribution box. Wherein, the first-level distribution box introduces three-phase power from the transformer; the second grade block terminal is near from one-level block terminal power cord to consumer, and tertiary block terminal is consumer self's control box, and sets up at the consumer periphery.
For example, the first-level power distribution cabinet is a power distribution cabinet in a building power distribution room; the second-stage distribution box is a fire pump control cabinet, a fan control cabinet, an emergency lighting cabinet, an elevator control cabinet and a distributed distribution box for supplying power to the third-stage distribution box in each floor; the third-stage distribution box is a control switch of an indoor illuminating lamp.
Step S21: and distributing the power equipment based on the BIM structure model.
And visually placing the power equipment at the designated working area position based on the BIM structural model of the target building.
In the Revit platform, planes are divided according to floors, when points are distributed in each plane, the power equipment is given a determined position, and the power equipment is given a determined height in a section, so that accurate point distribution of the power equipment in a BIM structural model is realized.
For example, a power distribution cabinet in a power distribution room is arranged on one floor or the next floor of a building; the fire pump control cabinet is arranged on the basement of the building and the middle floor of the building; the fan control cabinet is arranged on the roof of the building; the emergency lighting cabinet is arranged in each floor or four adjacent floors of the building; the elevator control cabinet is arranged on the roof of the building; the distributed power distribution cabinet and the indoor illuminating lamps are uniformly distributed on each floor of the building.
Step S22: and laying a lead based on the BIM structural model.
After the power equipment is arranged on the BIM structural model, a lead is erected between the power equipment and is used for communicating the corresponding power equipment to form a power system.
Through visual wiring, the condition that the cable detours can be effectively reduced, and visual picture basis can be provided for the cable to wear to establish wall body wiring simultaneously.
Further, based on the BIM structural model of the target building, a hybrid wiring of radioactive and trunk types is employed.
For example, a power distribution cabinet in a power distribution room is separately connected with a fire pump control cabinet, a fan control cabinet, an emergency lighting cabinet, an elevator control cabinet and a fan control cabinet; the power distribution cabinet in the power distribution room is respectively and independently connected with the distributed power distribution cabinet of each floor, and the distributed power distribution cabinet is connected with the control switch of the indoor illuminating lamp.
The power distribution cabinet in the power distribution room is respectively and independently connected with the fire pump control cabinet, the fan control cabinet, the emergency lighting cabinet, the elevator control cabinet and the fan control cabinet, so that independent laying of lines is realized, faults of all distribution lines are not affected by each other, and the reliability of a power supply system is improved. Corresponding indoor lighting lamp control switch is correspondingly connected through setting up a plurality of distributed distribution boxes, realizes arranging the flexibility of tertiary block terminal.
Step S23: and adjusting the BIM power system model.
In the process of laying power equipment and wires, the problem of voltage drop caused by overlong wire power supply distance often exists, so that the built BIM power system model needs to be adjusted.
Step S231: highlighting unreasonable electrical models for deployment.
Red marks indicate unreasonable wiring and power equipment placement, and green marks indicate reasonable wiring and power equipment placement.
Firstly, when the arrangement distance of a lead trunk line exceeds 250 meters, all leads and electric equipment in the trunk line are represented by red marks; if the distance of the conductor trunk line is less than 250 meters, all the conductors and electric equipment in the trunk line are represented by green marks.
And secondly, when the secondary distribution box needs to be directly started under full voltage and is far away from the primary distribution box by more than the required voltage drop distance, the secondary distribution box is represented by a red mark.
For example, in building electrical, a fire pump needs to be directly started at full voltage, when the fire pump is started, the current is 4-8.4 times of rated current, at this time, the high current impacts a low-voltage bus, and the fire pump cannot drive electric equipment which needs to be directly started at full voltage and is similar to the fire pump and is started at low voltage, so that when the alternating current motor is designed, the alternating current motor is arranged in a nearby area close to a power distribution cabinet in a power distribution room.
Step S232: and adjusting the power supply distance of the wires in the BIM power system model.
Marking the main line of the lead with the colors of the lead and the power equipment to judge whether the main line of the lead exceeds 250 meters;
if: the main line of the wire is marked in green, the main line of the wire does not exceed 250 meters, no adjustment is needed,
if: and if the main line of the wire is marked in red, the main line of the wire is more than 250 meters, and the arrangement position of the electric power equipment or the arrangement path of the wire is adjusted, or the arrangement position of the electric power equipment and the arrangement path of the wire are adjusted simultaneously, so that the main line of the wire and the electric power equipment become marked in green.
If the distance between the main lines of the wires in the electrical system is greater than 250 meters, the voltage drop of the wires may affect the normal operation of the secondary or tertiary distribution box. Therefore, through visual wiring and visual point compensation, the arrangement of the power equipment and the wires is reasonably adjusted, the problem of wire bypassing is reduced, the power supply distance is reduced, the length of the wires is reduced, the voltage drop on the wires is finally reduced, and the reliability of a power supply system is improved.
Step S3: and acquiring the length value of the wire in the BIM power system model.
Through the adjustment to BIM electric model, when power equipment and wire all appear green, can confirm the length of wire and the position of power equipment in BIM electric model. By means of visual wiring and visual point compensation, the bypassing problem and the power supply distance are reduced, voltage drop on a wire is finally reduced, and the reliability of a power supply system is improved.
Step S4: and acquiring the load calculation current in the BIM power system model by adopting a demand coefficient method.
After the building of the BIM power system model is completed, whether the electrical load in the building is in a reasonable range needs to be calculated. The calculation of the electrical load mainly refers to the calculation meeting the load current requirement, and a reasonable lead sectional area is selected to provide a basis for reasonable rotation of power equipment and control and protection equipment in a system. In the stage of scheme design and preliminary design, the serious consequences can be caused when the power load is excessively calculated or excessively calculated; if the power load is too small, the power supply circuit is overheated, the aging of the wire insulating material is accelerated, and meanwhile, more energy is consumed, so that the electric circuit is ignited, and safety accidents are caused; if the power load is too large, the capacity of the transformer is excessive, the sectional area of a power supply line is too large, the corresponding protection value is too high, and the protection sensitivity of power equipment is reduced; meanwhile, the selected lead has overlarge cross section, and unnecessary investment is increased.
Referring to fig. 3, the step of obtaining the load calculation current in the BIM power system model by using the demand coefficient method includes the following steps:
step S40: the device power is determined.
Outputting the rated power of the electric equipment to a BIM electrical family library, and uniformly converting the rated power of the electric equipment with different working systems into the power of a continuous working system; and uniformly converting the power of different physical quantities into active power.
Firstly, the power of the equipment for continuously operating the motor is equal to the rated power of the equipment;
secondly, the equipment power of the periodic work system motor is an active power conversion formula which uniformly converts rated power into 100% of load duration rate, and the active power conversion formula is as follows;
Ps-active power, kw, for unity load duration;
Pe-motor power rating, kw;
εN-motor rated load duration.
Thirdly, the equipment power of the short-time working motor is converted into the active power of the continuous working motor by the rated power.
Fourthly, converting the rated capacity into active power with the load duration rate of 100 percent by the equipment power of the electric welding machine;
Ps1-active power at load duration of 100%, kw;
SN-welding machine rated capacity, kVA;
εN-rated load duration rate;
Fifthly, the equipment power of the electric furnace transformer is the active power when the rated power factor is adopted;
Ps2-device active power, kw;
SN-rated capacity of the electric furnace transformer, kVA;
εN-rated load duration rate;
S41: acquiring load calculation current of the electric equipment set:
active power: pjs＝KxPs(kW)
Reactive power:
apparent power:
load calculation current:
in the formula:
Kxcoefficients required for the equipment group;
Psproviding a capacity (KW) for the group of devices;
ui is line voltage (kV);
i is the load calculation current (a).
S42: and acquiring the load of the distribution main line to calculate the current.
The method comprises the following steps that a plurality of power equipment groups grouped according to types of power equipment are connected to a low-voltage bus of a power distribution main line, and considering that each power equipment group does not operate at the maximum load at the same time, the calculation load of the power distribution main line is multiplied by a simultaneous coefficient after being equal to the sum of the calculation loads of the power equipment groups, namely the calculation load on the low-voltage bus of the power distribution main line is as follows:
active power: pjs＝K∑P∑(KxPs)(KW)
Reactive power:
apparent power:
load calculation current:
in the formula: kxTo the desired coefficient;
K∑Pand K∑QTaking the active coefficient and the reactive coefficient at the same time, and respectively taking the active coefficient and the reactive coefficient at 0.8-0.9 and 0.93-0.97; psThe unit is kW; ui is the rated line voltage (kV) of the electric equipment.
Step S5: and obtaining the numerical value of the sectional area of the wire in the BIM power system model.
If the main line excess is less than 250 meters, the section of the lead is selected according to a calculation method of heating conditions.
The cross-section of the conductor is selected according to the calculation method of the heating condition, and the heating condition is selected in a mode
Ijs≤In≤Iz
In the formula:
In-fuse melt rated current or circuit breaker rated current or setting current, a;
Ijs-loop load calculating current, a;
Izthe conductor allows for a continuous current carrying capacity, a.
Determining allowable continuous current-carrying capacity I of conductor according to environment temperature and correction coefficientzAnd thus the cross section of the wire can be determined.
Step S6: and calculating current, the length, the sectional area and the material of the lead according to the load in the BIM power system model, and determining the voltage drop of the line.
S60: the percent voltage drop per 1A-km of the wire is obtained and the line voltage drop is determined from the percent voltage drop.
Firstly, the voltage drop percentage calculation formula of the three-phase balanced load circuit is as follows:
△u1％＝△ua％Il
the voltage drop calculation formula is as follows:
△u1＝Ui*△u1/100
secondly, the percentage calculation formula of the voltage drop of the single-phase load line connected with the phase voltage is as follows,
△u2％≈2△ua％Il
the voltage drop calculation formula is as follows:
△u2＝Up*△u2/100
in the formula, delta ua% voltage drop per 1 A.km of the three-phase line,%/A.km;
△u1percent-percent voltage drop of the three-phase balanced load line,%;
△u2% voltage drop of single-phase load line,%;
△u1-line voltage drop, V, of the three-phase balanced load line;
△u2-line voltage drop, V, of the single-phase load line;
i-load calculation current, A;
l-line length, km;
ui-line voltage, V;
up is the phase voltage, V.
The implementation principle is as follows: building a BIM structure model of a target building, building a BIM power system model comprising power equipment and wires on the BIM structure model, and reasonably distributing the power equipment and the wires in the BIM structure model to obtain the length of the wires in the electrical system; calculating the electric load in the electric model to obtain the load current so as to determine the sectional area of the lead; the line voltage drop can be obtained by determining the length, the sectional area and the material of the conducting wire.
The embodiment of the application also discloses a device for determining the voltage drop for electrical design of the building, and the method for determining the voltage drop for electrical design of the building in the embodiment is used. Referring to fig. 4, it includes a model module 1, a database module 2, a mapping establishment module 3, and a processing module 4.
The model module 1 comprises a wire model and a plurality of electric power equipment models;
the database module 2 stores size parameter data, performance parameter data and load parameter data of the electric power equipment, and also stores material parameter data and sectional area parameter data of the lead;
the mapping establishing module 3 is communicated with the model module 1 and the database module 2, the mapping establishing module 3 maps the size parameter data, the performance parameter data and the load parameter data of the electric power equipment in the database module 2 to the electric power equipment model, and maps the material parameter data and the sectional area parameter data in the database module 2 to the lead wire model.
The power equipment model is communicated with the wire model, the processing module 4 is communicated with the database module 2, and the processing module 4 calculates the charge loads of the power equipment model and the wire model.
An application embodiment discloses a terminal device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor. The method for determining the voltage drop for building electrical design according to the above embodiment is adopted when the processor executes the computer program.
The terminal device includes a computer device such as a desktop computer, a notebook computer, or a cloud server, and the terminal device includes but is not limited to a processor and a memory, for example, the terminal device may further include an input/output device, a network access device, and a bus.
The processor may be a Central Processing Unit (CPU), and of course, according to the actual use situation, other general 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. may also be used, and the general processors may be microprocessors or any conventional processors, etc., which is not limited in this application.
The memory may be an internal storage unit of the terminal device, for example, a hard disk or a memory of the terminal device, or an external storage device of the terminal device, for example, a plug-in hard disk, a smart card (SMC), a secure digital card (SD) or a flash memory card (FC) provided on the terminal device, or a combination of the internal storage unit of the terminal device and the external storage device, and the memory is used for storing a computer program and other programs and data required by the terminal device, and the memory is also used for temporarily storing data that has been output or will be output, which is not limited in this application.
The method for determining the voltage drop for building electrical design is stored in a memory of the terminal device through the terminal device, and is loaded and executed on a processor of the terminal device, so that the terminal device is convenient for users to use.
The computer program may be stored in a computer readable medium, the computer program includes computer program code, the computer program code may be in a source code form, an object code form, an executable file or some intermediate form, and the like, the computer readable medium includes any entity or device capable of carrying the computer program code, a recording medium, a usb disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a Read Only Memory (ROM), a Random Access Memory (RAM), an electrical carrier signal, a telecommunication signal, a software distribution medium, and the like, and the computer readable medium includes but is not limited to the above components.
The method for determining the building electrical design voltage drop of the embodiment is stored in the computer readable storage medium through the computer readable storage medium, and is loaded and executed on the processor, so that the method for determining the building electrical design voltage drop is convenient to store and apply.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A method for determining the voltage drop for building electrical design is characterized in that: the method comprises the following steps:
building a BIM structural model of a target building;
building a BIM power system model comprising a lead and power equipment based on a BIM structure model of a target building;
acquiring a length value of a wire in a BIM power system model;
acquiring load calculation current in a BIM power system model by adopting a required coefficient method;
calculating current based on load in the BIM power system model, and acquiring a sectional area numerical value of a wire in the BIM power system model;
calculating current, length, sectional area and material of a lead according to load in a BIM power system model, and determining voltage drop of a distribution line;
the method comprises the following steps of calculating current, the length, the sectional area and the material of a lead according to the load in the BIM power system model, and determining the voltage drop of a line, wherein the method comprises the following steps: obtaining the percentage of voltage drop per 1 A.km of the wire, the percentage of voltage drop and determining the line voltage drop:
firstly, the voltage drop percentage calculation formula of the three-phase balanced load circuit is as follows:
△u1％＝△ua％Il
the voltage drop calculation formula is as follows:
△u1＝Ui*△u1/100
secondly, the percentage calculation formula of the voltage drop of the single-phase load line connected with the phase voltage is as follows,
△u2％≈2△ua％Il
the voltage drop calculation formula is as follows:
△u2＝Up*△u2/100
in the formula, delta ua% voltage drop per 1 A.km of the three-phase line,%/A.km;
△u1percent-percent voltage drop of the three-phase balanced load line,%;
△u2% voltage drop of single-phase load line,%;
△u1-line voltage drop, V, of the three-phase balanced load line;
△u2-line voltage drop, V, of the single-phase load line;
i-load calculation current, A;
l-line length, km;
ui-line voltage, V;
up is the phase voltage, V.
2. The method for determining the voltage drop for electrical design of buildings according to claim 1, wherein the method comprises the following steps: the BIM structure model based on the target building is built in a BIM power system model, and the method comprises the following steps:
establishing an electrical family library comprising power equipment and a lead, wherein the power equipment is provided with a plurality of groups of parameter data, and the lead is provided with a plurality of groups of parameter data;
distributing power equipment and wires based on the BIM structural model;
and adjusting the BIM power system model.
3. The method for determining the voltage drop for electrical design of buildings according to claim 2, wherein: the adjusting of the BIM power system model comprises the following steps:
highlighting unreasonably laid electrical models;
adjusting the power supply distance of a wire in the BIM power system model;
the highlighting lays out in an unreasonable electrical model,
if the wiring trunk line arrangement distance exceeds 250 meters, all the wires and the electric power equipment in the trunk line are represented by red marks; if the wiring trunk line arrangement distance is less than 250 meters, all the wires and the electric power equipment in the trunk line are represented by green marks;
in adjusting the power supply distance of the wires in the BIM power system model,
if the main line of the wire is red marked, the arrangement position of the electric power equipment or the arrangement path of the wire is adjusted, or the arrangement position of the electric power equipment and the arrangement path of the wire are adjusted simultaneously, so that the main line of the wire and the electric power equipment become green marks.
4. The method for determining the voltage drop for electrical design of buildings according to claim 3, wherein the method comprises the following steps: in the step of obtaining the length value of the wire in the BIM electric power system model, when the electric power equipment and the wire are both green, the length of the wire in the BIM electric model is determined.
5. The method for determining the voltage drop for electrical design of buildings according to claim 4, wherein the method comprises the following steps: the method for acquiring the load calculation current in the BIM power system model by adopting the demand coefficient method comprises the following steps:
determining the power of the equipment;
acquiring load calculation current of the electric equipment set;
acquiring load calculation current of a power distribution main line;
in the determining of the power of the device,
outputting the rated power of the electric equipment to a BIM electrical family library, and uniformly converting the rated power of the electric equipment with different working systems into the power of a continuous working system; uniformly converting the power of different physical quantities into active power;
firstly, the power of equipment connected with a working system motor is equal to the rated power of the equipment;
secondly, the equipment power of the periodic work system motor is an active power conversion formula which uniformly converts rated power into 100% of load duration rate, and the active power conversion formula is as follows;
Ps-active power, kw, for unity load duration;
Pe-motor power rating, kw;
εN-motor rated load duration;
thirdly, converting the rated power into the active power of the continuous working system;
fourthly, converting the rated capacity into active power with the load duration rate of 100 percent by the equipment power of the electric welding machine;
Ps1-active power at load duration of 100%, kw;
SN-welding machine rated capacity, kVA;
εN-rated load duration rate;
fifthly, the equipment power of the electric furnace transformer is the active power when the rated power factor is adopted;
Ps2-device active power, kw;
SN-rated capacity of the electric furnace transformer, kVA;
εN-rated load duration rate;
in the acquiring the load calculation current of the electric equipment group,
active power: pjs＝KxPs(kW)
Reactive power:
apparent power:
load calculation current:
in the formula: kxCoefficient required for a group of devices, PsA capacity (KW) is provided for the set of devices,
to useThe power factor angle of the electrical equipment, U is line voltage (V), and I is load calculation current (A);
in the acquisition of the electrical distribution mains computing load,
active power:
reactive power:
apparent power:
load calculation current:
in the formula: kxTo the desired coefficient; k∑PAnd K∑QTaking the active coefficient and the reactive coefficient at the same time, and respectively taking the active coefficient and the reactive coefficient at 0.8-0.9 and 0.93-0.97; psThe unit is kW; u is the system nominal voltage (line voltage), kV.
6. The method for determining the voltage drop for electrical design of buildings according to claim 5, wherein the method comprises the following steps: obtaining the numerical value of the sectional area of the wire in the BIM power system model,
selecting a wire section according to a calculation method of heating conditions, wherein the selection mode of the heating conditions is as follows;
Ijs≤In≤Iz
in the formula:
In-fuse melt rated current or circuit breaker rated current or setting current, a;
Ijs-loop load calculating current, a;
Izthe conductor allows for a continuous current carrying capacity, a.
7. The method for determining the voltage drop for electrical design of buildings according to claim 6, wherein the method comprises the following steps: the establishing comprises establishing an electrical family library containing power equipment and wires,
and numbering the power equipment and the conducting wires.
8. An electricity-voltage drop determination device for building electrical design, which adopts a method for determining electricity-voltage drop for building electrical design based on any one of claims 1-7, and is characterized in that: the system comprises a model module (1), a database module (2), a mapping establishing module (3) and a processing module (4); the database module (2) stores parameter data of the model module (1), the mapping establishing module (3) is used for mapping the parameter data into the model module (1), and the processing module (4) is used for calculating the charge load of the model module (1).
9. A terminal, characterized by: the method for determining the voltage drop for the electrical design of the building, which is stored in the memory and can be run on the processor, is characterized in that when the computer program is loaded and executed by the processor, the method for determining the voltage drop for the electrical design of the building, which is recited in any one of claims 1 to 7, is adopted.
10. A computer-readable storage medium characterized by: the computer-readable storage medium stores a computer program, wherein the computer program is loaded into a processor and executed by the processor, and the method for determining voltage drop for electrical design of building according to any one of claims 1 to 7 is applied.
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| CN202210013151.5A CN114357776A (en) | 2022-01-06 | 2022-01-06 | Method and device for determining voltage drop for building electrical design and computer readable storage medium |
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| CN202210013151.5A CN114357776A (en) | 2022-01-06 | 2022-01-06 | Method and device for determining voltage drop for building electrical design and computer readable storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115663930A (en) * | 2022-11-08 | 2023-01-31 | 佛山电力设计院有限公司 | Building method of transformer substation power supply system, computer equipment and readable storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115663930A (en) * | 2022-11-08 | 2023-01-31 | 佛山电力设计院有限公司 | Building method of transformer substation power supply system, computer equipment and readable storage medium |
| CN115663930B (en) * | 2022-11-08 | 2023-11-24 | 佛山电力设计院有限公司 | Method for building power supply system of transformer substation, computer equipment and readable storage medium |
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