CN110360978A - The cross-section of cable product calculation method of load distribution based on direct current - Google Patents
The cross-section of cable product calculation method of load distribution based on direct current Download PDFInfo
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- CN110360978A CN110360978A CN201910558113.6A CN201910558113A CN110360978A CN 110360978 A CN110360978 A CN 110360978A CN 201910558113 A CN201910558113 A CN 201910558113A CN 110360978 A CN110360978 A CN 110360978A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/28—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring areas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
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- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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Abstract
The present invention provides a kind of cross-section of cable of load distribution based on direct current product calculation methods, comprising the following steps: according to cable application scene demand, presets current-carrying capacity, voltage drop, line loss and the short circuit current threshold value of the cable；Input dc power power supply parameter；Calculate the resistance R of cable；The pressure drop obtained on line current and the cable is calculated according to the power supply parameter, calculates the ratio that cable voltage drop accounts for voltage rating；Calculate route total losses；Calculate the ratio that cable loss accounts for output power；According to preset voltage drop and line loss threshold value, the sectional area A of the cable is calculated.Whereby, the present invention can accurately calculate the sectional area of required cable.
Description
Technical field
The present invention relates to cable calculation processing technical fields more particularly to a kind of cable of the load distribution based on direct current to cut
Area computation method.
Background technique
In the installation, transformation of lighting circuit, there are mainly four types of the selection gists of wire/cable: allowing current-carrying capacity, allows
Ensure that relay protection can be operating normally when the loss of voltage, line loss and line end short circuit.According to different power circuits
Type, is generally subject to the middle one or two kinds of of above-mentioned selection gist, using other as verification project.Usually low pressure (usually
220V) in route, illuminating line allows the loss of voltage referring to route to select the section of wire/cable；Motor circuit reference is led
The permission current-carrying capacity (allow for a long time with conductor temperature, radiating condition etc. in relation to) of body be according to come the section that selects wire/cable,
Therefore, a kind of accurate method of calculating is needed in practical application.
Summary of the invention
For above-mentioned defect, the purpose of the present invention is to provide a kind of cross-section of cable of load distribution based on direct current products
Calculation method can accurately calculate the sectional area of required cable.
To achieve the goals above, the present invention provides a kind of cross-section of cable product calculation method based on load distribution, including
Following steps:
According to cable application scene demand, current-carrying capacity, voltage drop, line loss and the short circuit current threshold of the cable are preset
Value；
Input dc power power supply parameter, the power supply parameter include: that positive and negative cable wire length is L, every cable resistance rate
For ρ；The rated value Vdc of DC voltage average value；Gross output P；Electrical appliance efficiency is Effdc；N load, each load are defeated
Power is P0 out, and the distance between each load is L/n；
Calculate the resistance R of cable；
The pressure drop obtained on line current and the cable is calculated according to the power supply parameter, wherein the electricity of each load
Stream isFirst segment line current since supply side is I1, the line electricity in final stage load
Stream is In, the current relationship of adjacent twolink are as follows: Ik=Ik+1+I0；Line end electric current are as follows: In=I0；Route starting point electricity
Stream are as follows:
The pressure drop (considering positive and negative two sections) of every section of route are as follows:
Route overall presure drop are as follows:
Calculate the ratio that cable voltage drop accounts for voltage rating:
The loss (considering positive and negative two sections) of every section of route are as follows:
Calculate route total losses are as follows:
Calculate the ratio that cable loss accounts for output power are as follows:
According to preset voltage drop and line loss threshold value, the sectional area A of the cable is calculated.
Cross-section of cable product calculation method according to the present invention based on load distribution, the method also includes:
According to the sectional area A for the cable being calculated, whether checking computations meet the current-carrying capacity and short circuit current threshold value.
The present invention provides a kind of cross-section of cable of load distribution based on direct current product calculation methods, comprising the following steps:
According to cable application scene demand, current-carrying capacity, voltage drop, line loss and the short circuit current threshold value of the cable are preset；Input
Powered by direct current parameter；Calculate the resistance R of cable；It is calculated and is obtained on line current and the cable according to the power supply parameter
Pressure drop calculates the ratio that cable voltage drop accounts for voltage rating；Calculate route total losses；Calculate the ratio that cable loss accounts for output power
Example；According to preset voltage drop and line loss threshold value, the sectional area A of the cable is calculated.Whereby, the present invention can be accurate
The sectional area of cable needed for calculating.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the DC application schematic diagram of a scenario of one embodiment of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1, the cross-section of cable product calculation method based on load distribution that the present invention provides a kind of is of the present invention
Load distribution refers to all application scenarios for loading and being all uniformly distributed in power supply line, such as Fig. 2.The method includes following steps
It is rapid:
Step S101, according to cable application scene demand, preset the current-carrying capacity of the cable, voltage drop, line loss and
Short circuit current threshold value.Such as, in an embodiment, concrete application demand are as follows: current-carrying capacity is no more than 4A/mm2；Voltage drop is no more than specified
The 10% of voltage；Line loss is no more than the 10% of output power；Ensure that relay protection can be moved normally when line end short circuit
Make (short circuit current is greater than 5 times of line-breaker rated current).
Step S102, input dc power power supply parameter, the power supply parameter include: that positive and negative cable wire length is L, every electricity
Cable resistivity is ρ；The rated value Vdc of DC voltage average value；Gross output P；Electrical appliance efficiency is Effdc；N load, often
A load output power is P0, and the distance between each load is L/n；
Step S103 calculates the resistance R of cable；
Step S104 calculates the pressure drop obtained on line current and the cable according to the power supply parameter, wherein each
The electric current of load isFirst segment line current since supply side is I1, final stage load
On line current be In, the current relationship of adjacent twolink are as follows:
Ik=Ik+1+I0；Line end electric current are as follows: In=I0；Route starting point electric current are as follows:
The pressure drop (considering positive and negative two sections) of every section of route are as follows:
Route overall presure drop are as follows:
Step S105 calculates the ratio that cable voltage drop accounts for voltage rating:
The loss (considering positive and negative two sections) of every section of route are as follows:
Step S106 calculates route total losses are as follows:
Step S107 calculates the ratio that cable loss accounts for output power are as follows:
Step S108 calculates the sectional area A of the cable according to preset voltage drop and line loss threshold value.
Specifically, only having A in above-mentioned each calculation formula is unknown quantity, according to the available difference of preset threshold value comparison
Sectional area A value.Such as, sectional area A1 is obtained according to the threshold value of voltage drop, sectional area A2 is calculated according to cable loss.
In conclusion the present invention provides a kind of cross-section of cable of load distribution based on direct current product calculation methods, including
Following steps: according to cable application scene demand, current-carrying capacity, voltage drop, line loss and the short circuit current of the cable are preset
Threshold value；Input dc power power supply parameter；Calculate the resistance R of cable；It is calculated according to the power supply parameter and obtains line current and institute
The pressure drop on cable is stated, the ratio that cable voltage drop accounts for voltage rating is calculated；Calculate route total losses；It calculates cable loss and accounts for output
The ratio of power；According to preset voltage drop and line loss threshold value, the sectional area A of the cable is calculated.Whereby, the present invention can
Accurately to calculate the sectional area of required cable.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (2)
1. a kind of cross-section of cable product calculation method of load distribution based on direct current, which comprises the following steps:
According to cable application scene demand, current-carrying capacity, voltage drop, line loss and the short circuit current threshold value of the cable are preset；
Input dc power power supply parameter, the power supply parameter include: that positive and negative cable wire length is L, and every cable resistance rate is ρ；
The rated value Vdc of DC voltage average value；Gross output P；Electrical appliance efficiency is Effdc；N load, each load output work
Rate is P0, and the distance between each load is L/n；
Calculate the resistance R of cable；
The pressure drop obtained on line current and the cable is calculated according to the power supply parameter, wherein the electric current of each load isFirst segment line current since supply side is I1, the line current in final stage load
For In, the current relationship of adjacent twolink are as follows: Ik=Ik+1+I0；Line end electric current are as follows: In=I0；Route starting point electric current
Are as follows:
The pressure drop (considering positive and negative two sections) of every section of route are as follows:
Route overall presure drop are as follows:
Calculate the ratio that cable voltage drop accounts for voltage rating:
The loss (considering positive and negative two sections) of every section of route are as follows:
Calculate route total losses are as follows:
Calculate the ratio that cable loss accounts for output power are as follows:
According to preset voltage drop and line loss threshold value, the sectional area A of the cable is calculated.
2. the cross-section of cable product calculation method of the load distribution according to claim 1 based on direct current, which is characterized in that institute
State method further include:
According to the sectional area A for the cable being calculated, whether checking computations meet the current-carrying capacity and short circuit current threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910558113.6A CN110360978B (en) | 2019-06-26 | 2019-06-26 | Cable sectional area calculation method based on direct current load distribution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910558113.6A CN110360978B (en) | 2019-06-26 | 2019-06-26 | Cable sectional area calculation method based on direct current load distribution |
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| CN110360978B CN110360978B (en) | 2021-05-04 |
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| CN201910558113.6A Active CN110360978B (en) | 2019-06-26 | 2019-06-26 | Cable sectional area calculation method based on direct current load distribution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562426A (en) * | 2020-05-18 | 2020-08-21 | 厦门合立道工程设计集团股份有限公司 | Quick judgment method for safe voltage drop of building electric direct current line conductor |
| CN111817283A (en) * | 2020-08-06 | 2020-10-23 | 江苏筑森建筑设计有限公司 | Method for calculating voltage loss of direct-current distribution line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562426A (en) * | 2020-05-18 | 2020-08-21 | 厦门合立道工程设计集团股份有限公司 | Quick judgment method for safe voltage drop of building electric direct current line conductor |
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Denomination of invention: Calculation method of cable cross-sectional area based on DC load distribution Effective date of registration: 20220815 Granted publication date: 20210504 Pledgee: Weifang Development Branch of Industrial and Commercial Bank of China Ltd. Pledgor: SHANDONG SANJING LIGHTING SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2022980012458 |
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