CN110059975A - The calculation method and its application of uneven dispersion load end pressure drop - Google Patents
The calculation method and its application of uneven dispersion load end pressure drop Download PDFInfo
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Abstract
The present invention relates to the calculation methods and its application of a kind of end pressure drop of uneven dispersion load, belong to road lighting technical field, calculation method includes: A: determining the loss of voltage percentage of the initial load voltage of power supply, total number of segment of cable, the length of every section of scatteredload cable, three-phase line, and the model according to cable determines every section of cable general power；B: scatteredload electric current, the scatteredload voltage, cable voltage drop of every section of cable is calculated；C: every section of cable voltage drop is superimposed, overall presure drop is calculated；D: according to the initial load voltage of power supply, and overall presure drop is utilized, pressure drop percentage is calculated, and provide foundation for the selection of cable model.The calculation method, the accuracy and reliability of cable end piece voltage drop value is not only increased, and foundation can be provided to the selection of cable model, guarantees the reasonability and economy of cable model selection, every section of cable voltage drop and every section of scatteredload voltage are provided simultaneously, improves its scope of application.
Description
Technical field
The present invention relates to road lighting technical fields, more specifically, it is related to a kind of uneven dispersion load end pressure
The calculation method and its application of drop.
Background technique
Street lamp is the important component of urban infrastructure construction, when selecting the cable of road lighting, one
As scatteredload is summarized as concentrated load, to estimate the calculation method of end pressure drop.This method is according to ring current end
Calculating current, selection meet the cable model of current-carrying capacity demand, and voltage cable loss coefficient is recycled to calculate pressure drop, such as discontented
Sufficient pressure drop demand, then increase the level-one cross-section of cable again, continues to verify, calculate repeatedly, meets pressure drop demand until obtaining
Cable model.This method assumes that all dispersion power loads concentrate among route, although calculation method is simple, does not have
There are consideration actual conditions.
In real road illuminating engineering, circuit illuminating engineering has cable load little, the longer feature of power supply distance,
And often influenced by roads field conditions such as intersection crossing position, existing structure, separation belt end, entrances,
Its street lamp is unevenly distributed arrangement, and according to different actual conditions, lamp power is also not quite similar, therefore, adopt
It is larger for the end voltage drop value deviation of uneven dispersion carry calculation out in aforementioned manners.
Summary of the invention
The purpose of the present invention is to provide a kind of calculation methods of uneven dispersion load end pressure drop, by every section of electricity
Scatteredload electric current, scatteredload voltage, the cable voltage drop of cable are calculated, and every section of cable voltage drop is superimposed, and are obtained
Overall presure drop takes into account the influence factor in work progress, not only increases the accuracy of cable end piece voltage drop value and reliable
Property, and foundation can be provided the selection of cable model, guarantee the reasonability and economy of cable model selection, reduces and apply
Work cost improves its scope of application, while can also provide every section of cable voltage drop and every section of scatteredload voltage, further
Improve its scope of application.
Above-mentioned technical purpose of the invention has the technical scheme that
The calculation method of uneven dispersion load end pressure drop, includes the following steps:
A: the electricity of the initial load voltage of power supply, total number of segment of cable, the length of every section of scatteredload cable, three-phase line is determined
Crushing loses percentage, and determines every section of cable general power according to cable model；
B: according to the initial load voltage of power supply, total number of segment of cable, the length of every section of scatteredload cable, three-phase line electricity
Crushing loses percentage, every section of cable general power, and scatteredload electric current, the scatteredload voltage, cable of every section of cable is calculated
Voltage drop；
C: every section of cable voltage drop is superimposed, overall presure drop is calculated；
D: according to the initial load voltage of power supply, and overall presure drop is utilized, pressure drop percentage is calculated.
By using above-mentioned technical proposal, pass through scatteredload electric current, scatteredload voltage, the cable electricity to every section of cable
Pressure drop is calculated, and every section of cable voltage drop is superimposed, and finally obtains overall presure drop, and the influence factor in work progress is considered
Enter, not only increase the accuracy and reliability of cable end piece voltage drop value, improves its scope of application, while can also provide
Every section of cable voltage drop and every section of scatteredload voltage, improve its scope of application.
Preferably, in step B, scatteredload electric current, scatteredload voltage, the cable voltage drop of first segment use following
Method calculates:
(1) it is superimposed, calculates to last one section of cable general power according to the initial load voltage of power supply, first segment cable general power
To the scatteredload electric current of first segment；
(2) according to the length of scatteredload cable of first segment, the initial load voltage of power supply, three-phase line the loss of voltage hundred
Score, and using the scatteredload electric current of first segment, the cable voltage drop of first segment is calculated；
(3) according to the initial load voltage of power supply, and using the cable voltage drop of first segment, the dispersion that first segment is calculated is negative
Charged pressure.
By using above-mentioned technical proposal, according to the initial load voltage of power supply, total number of segment of cable, every section of cable total work
Rate, the length of first segment scatteredload cable, three-phase line loss of voltage percentage, be calculated step by step first segment point
The scatteredload voltage for dissipating load current, the cable voltage drop of first segment, first segment, improves its accuracy and reliability.
Preferably, it defining, total number of segment of cable is N, and N is the integer greater than 1, any one section in the total number of segment of cable
For n, and n is 1 integer for arriving N；
In step B, n-th section of scatteredload cable, scatteredload voltage, cable voltage drop are calculated using following methods:
(1) the scatteredload voltage of n-1 sections of foundation, n-th section of cable general power are superimposed to N sections of cable general powers, are calculated
N-th section of scatteredload electric current；
(2) according to n-th section the length of scatteredload cable, n-1 sections of scatteredload voltage, three-phase line the loss of voltage hundred
Score, and using n-th section of scatteredload electric current, n-th section of cable voltage drop is calculated；
(3) according to n-1 sections of scatteredload voltage, and using n-th section of cable voltage drop, it is negative that n-th section of dispersion is calculated
Charged pressure.
It is total according to n-1 sections of scatteredload voltages, total number of segment, the every section of cable of cable by using above-mentioned technical proposal
Power, the length of n-th section of scatteredload cable, three-phase line loss of voltage percentage, n-th section of point is calculated step by step
Load current, n-th section of cable voltage drop, n-th section of scatteredload voltage are dissipated, its accuracy and reliability is improved.
Preferably, in step B,
The calculation formula of n-th section of scatteredload electric current are as follows:
The calculation formula of n-th section of cable voltage drop are as follows:
ΔUn=Un-1*In*Ln*ΔUa%/100
The calculation formula of n-th section of scatteredload voltage are as follows:
Un=Un-1-ΔUn
In formula:
Power factor；
In: n-th section of scatteredload electric current, unit A；
Pn: n-th section of cable general power, unit kW；
Un: n-th section of scatteredload voltage, unit V；
ΔUn: n-th section of scatteredload voltage drop, unit V；
Ln: the length of n-th section of scatteredload cable, unit m；
ΔUa%: the loss of voltage percentage of three-phase line, unit %Akm.
By using above-mentioned technical proposal, to n-th section of scatteredload electric current, n-th section of cable voltage drop, n-th section
The calculation formula of scatteredload voltage embodies, and improves the accuracy and reliability of calculation method, while can calculate every
Section cable voltage drop and every section of scatteredload voltage, improve its scope of application.
Preferably, in step C,
The calculation formula of overall presure drop are as follows:
By using above-mentioned technical proposal, the calculation formula of overall presure drop is embodied, overall presure drop is obtained.
Preferably, in step D,
The calculation formula of pressure drop percentage are as follows:
In formula:
U0: the initial load voltage of power supply, unit V；
Δ U%: pressure drop percentage.
By using above-mentioned technical proposal, the calculation formula of pressure drop percentage is embodied, pressure drop percentage is obtained, is improved
The accuracy and reliability of calculation method.
The purpose of the present invention two is to provide the application of the calculation method using the end pressure drop of above-mentioned uneven dispersion load,
Cable model is obtained by anti-pushing manipulation, can realize the selection to cable model, guarantees the reasonability of cable model selection
And economy, construction cost is reduced, its scope of application is improved.
Using the application of the calculation method of above-mentioned uneven dispersion load end pressure drop, determine that the original negative of power supply is charged
Pressure, total number of segment of cable, the length of every section of scatteredload cable, the loss of voltage percentage of three-phase line, pressure drop percentage, meter
Calculation obtains every section of cable general power, selects suitable cable model according to every section of cable general power.
By using above-mentioned technical proposal, cable model is obtained by anti-pushing manipulation, can be realized to cable model
Selection is avoided influencing the service life of street lamp because cable powering selection is too small, while being avoided due to cable powering selects too greatly
Increase construction cost, guarantee the reasonability and economy of cable model selection, reduce construction cost, improves it and be applicable in model
It encloses.
Preferably, pressure drop percentage is less than or equal to 5%.
By using above-mentioned technical proposal, the numerical value of pressure drop percentage is optimized, improves cable model selection
Reasonability and economy.
The purpose of the present invention three is to provide the application of the calculation method using the end pressure drop of above-mentioned uneven dispersion load,
Cable model is obtained by being chosen over iterative method, can realize the selection to cable model, guarantees cable model selection
Reasonability and economy, reduce construction cost, improve its scope of application.
Using the application of the calculation method of above-mentioned uneven dispersion load end pressure drop, a cable model is predefined,
And determine length, the voltage damage of three-phase line of the initial load voltage of power supply, total number of segment of cable, every section of scatteredload cable
Percentage is lost, and determines every section of cable general power according to pre-selected cable model, pressure drop percentage is calculated, if pressure drop percentage
Than being less than or equal to 5%, then the selection of cable model is met the requirements, if pressure drop percentage is greater than 5%, selects cable model simultaneously again
Pressure drop percentage is calculated, until pressure drop percentage is less than or equal to 5%, to complete the selection of cable model.
By using above-mentioned technical proposal, cable model is obtained by being chosen over iterative method, can be realized to electricity
The selection of cable model avoids influencing the service life of street lamp because cable powering selection is too small, while avoiding selecting because of cable powering
It selects too big and increases construction cost, guarantee the reasonability and economy of cable model selection, reduce construction cost, improve it
The scope of application.
In conclusion the invention has the following advantages:
The first, the calculation method of uneven dispersion load end pressure drop of the invention passes through the scatteredload electricity to every section of cable
Stream, scatteredload voltage, cable voltage drop are calculated, and every section of cable voltage drop is superimposed, and are obtained overall presure drop, will be constructed
Influence factor in journey is taken into account, and the accuracy and reliability of cable end piece voltage drop value is improved.
The second, the calculation method of uneven dispersion load end pressure drop of the invention, additionally it is possible to which every section of voltage cable is provided
Drop and every section of scatteredload voltage, further improve its scope of application.
The application of third, the calculation method of the invention using the end pressure drop of uneven dispersion load, is obtained by anti-pushing manipulation
To cable model, the selection to cable model can be realized, guarantee the reasonability and economy of cable model selection, reduce
Construction cost, improves its scope of application.
4th, the application of the calculation method of the invention using the end pressure drop of uneven dispersion load, by being chosen over
Iterative method obtains cable model, can realize the selection to cable model, guarantees the reasonability and warp of cable model selection
Ji property, reduces construction cost, improves its scope of application.
Specific embodiment
Invention is further described in detail with reference to embodiments.It should be understood that described in the embodiment of the present invention
Preparation method is only used for illustrating the present invention, rather than limiting the invention, to this hair under concept thereof of the invention
The simple modifications of bright preparation method belong to the scope of protection of present invention.
Embodiment 1
The calculation method of uneven dispersion load end pressure drop
Definition, total number of segment of cable is N, and N is the integer greater than 1, and any one section in the total number of segment N of cable is n, and n arrives for 1
The integer of N.
A: the initial load voltage U of power supply is determined0, total number of segment N of cable, every section of scatteredload cable length Ln, three-phase
The loss of voltage percentage Δ U of routea%, and every section of cable general power P is determined according to cable modeln；
B: the initial load voltage U according to power supply0, total number of segment N of cable, every section of scatteredload cable length Ln, triple line
The loss of voltage percentage Δ U on roada%, every section of cable general power Pn, the scatteredload electric current I of every section of cable is calculatedn, point
Dissipate load voltage Un, cable voltage drop Δ Un；
The scatteredload electric current I of first segment1, first segment cable voltage drop Δ U1, first segment scatteredload voltage U1Use with
Lower method calculates:
(1) according to the initial load voltage U of power supply0, first segment cable general power is superimposed to N sections of cable general powersThe scatteredload electric current I of first segment is calculated1, the scatteredload electric current I of first segment1Calculation formula are as follows:
(2) the length L according to the scatteredload cable of first segment1, power supply initial load voltage U0, three-phase line voltage damage
Lose percentage Δ Ua%, and the scatteredload electric current I of sharp first segment1, the cable voltage drop Δ U of first segment is calculated1, first
The cable voltage drop Δ U of section1Calculation formula are as follows:
ΔU1=U0*I1*L1*ΔUa%/100
(3) according to the initial load voltage U of power supply0, and utilize the cable voltage drop Δ U of first segment1, first segment is calculated
Scatteredload voltage U1, the scatteredload voltage U of first segment1Calculation formula are as follows:
U1=U0-ΔU1
N-th section of scatteredload electric current In, n-th section of scatteredload voltage Un, n-th section of cable voltage drop Δ UnUsing following
Method calculates:
(1) according to n-1 sections of scatteredload voltage Un-1, n-th section of cable general power be superimposed to N sections of cable general powersN-th section of scatteredload electric current I is calculatedn, n-th section of scatteredload electric current InCalculation formula be；
(2) the length L of the scatteredload cable of n-th section of foundationn, n-1 sections of scatteredload voltage Un-1, three-phase line voltage
Lose percentage Δ Ua%, and utilize n-th section of scatteredload electric current In, n-th section of cable voltage drop Δ U is calculatedn, n-th
The cable voltage drop Δ U of sectionnCalculation formula be；
ΔUn=Un-1*In*Ln*ΔUa%/100
(3) according to n-1 sections of scatteredload voltage Un-1, and utilize n-th section of cable voltage drop Δ Un, it is calculated n-th section
Scatteredload voltage Un, n-th section of scatteredload voltage UnCalculation formula are as follows:
Un=Un-1-ΔUn
N sections of scatteredload electric current IN, N sections of scatteredload voltage UN, N sections of cable voltage drop Δ UNUsing following
Method calculates:
(1) according to N-1 sections of scatteredload voltage UN-1, N sections of cable general power PN, N sections of scatteredload electricity is calculated
Flow IN, N sections of scatteredload electric current INCalculation formula be；
(2) the length L of the scatteredload cable of N sections of foundationN, N-1 sections of scatteredload voltage UN-1, three-phase line voltage
Lose percentage Δ Ua%, and utilize N sections of scatteredload electric current IN, N sections of cable voltage drop Δ U is calculatedN, N
The cable voltage drop Δ U of sectionNCalculation formula be；
ΔUN=UN-1*IN*LN*ΔUa%/100
(3) according to N-1 sections of scatteredload voltage UN-1, and utilize N sections of cable voltage drop Δ UN, it is calculated N sections
Scatteredload voltage UN, N sections of scatteredload voltage UNCalculation formula are as follows:
UN=UN-1-ΔUN
C: by N sections of cable voltage drop Δ UnSuperposition, is calculated overall presure dropOverall presure dropCalculation formula
Are as follows:
D: the initial load voltage U according to power supply0, and utilize overall presure dropPressure drop percentage Δ U% is calculated,
The calculation formula of pressure drop percentage Δ U% are as follows:
In formula:
Power factor；
In: n-th section of scatteredload electric current, unit A；
Pn: n-th section of cable general power, unit kW；
U0: the initial load voltage of power supply, unit V；
Un: n-th section of scatteredload voltage, unit V；
ΔUn: n-th section of scatteredload voltage drop, unit V；
Ln: the length of n-th section of scatteredload cable, unit m；
ΔUa%: the loss of voltage percentage of three-phase line, unit %Akm；
Δ U%: pressure drop percentage.
Wherein, the type of cable can be one of copper cable, aluminium cable, aluminium alloy cable, allow to as needed into
Row selection；The type of cable can be one of VV, YJV, TC90, allow to be selected as needed；The cross-section of cable
It can be 16mm2、25mm2、35mm2One of, allow to be selected as needed；Power factorCan be
0.5, one of 0.6,0.7,0.8,0.85,0.9, allow to be selected as needed, the loss of voltage of three-phase line
Percentage Δ Ua% is obtained according to handbook access；The initial load voltage of power supply can be one of 380V, 220V, make it can
To be selected as needed；The length L of every section of scatteredload cablenFor 30-45mm, allow to be selected as needed
It selects, the general power that every section of scatteredload power P n is calculated according to cable powering and lamp power.
With Shijiazhuang construction street, for the illuminating engineering of South 2nd Ring Road to southern chestnut open channel, and carries out Practical Project data and adopt
Collection, cable model YJV-0.6/4*35mm2Copper cable, load has a street lamp on every section of cable, and every section of cable general power is electricity
Cable power and lamp power superposition, street lamp number D0n are n-th of street lamp since power end, different cable initial value datas
As shown in table 1, the acquisition of Practical Project data is as shown in table 2 for acquisition.
The different phase sequence initial value data acquisitions of table 1
| Cable phase sequence | Power supply initial current/A | Power supply initial voltage/V |
| L1 | 26.9 | 225 |
| L2 | 37.2 | 224 |
| L3 | 35.8 | 226 |
The acquisition of 2 Practical Project data of table
Remarks: road lamp maintenance personnel inform the damage of D01 and D04 road lamp compensating electric capacity, current measurement value, electricity when field measurement
Pressing measured value is inlet wire cable current value, voltage value at each lamp stand.
Survey cable end piece pressure drop and pressure drop percentage；
The end voltage drop value of L1 phase is 8V, pressure drop percentage 3.56%；The end voltage drop value of L2 phase is 8V, and pressure drop percentage is
3.57%；The end voltage drop value of L3 phase is 8V, pressure drop percentage 3.54%.
With Shijiazhuang construction street, for the illuminating engineering of South 2nd Ring Road to southern chestnut open channel, and carries out Practical Project data and adopt
Collection, cable model YJV-0.6/4*35mm2Copper cable, load has a street lamp on every section of cable, and every section of cable general power is electricity
Cable power and lamp power superposition, street lamp number D0n are n-th of street lamp since power end, different cable initial value datas
As shown in table 1, Practical Project the calculated results are as shown in table 3 for acquisition.
3 Practical Project the calculated results of table
Using the calculation method of uneven dispersion load end pressure drop of the invention, theoretical cable end piece voltage drop value and pressure are obtained
Percentage drops；
The end voltage drop value of L1 phase is 5.68V, pressure drop percentage 2.58%；The end voltage drop value of L2 phase is 6.69V, pressure drop hundred
Divide than being 3.0%；The end voltage drop value of L3 phase is 6.63V, pressure drop percentage 2.88%.
By comparison L1 phase actual pressure drop percentage and theoretical pressure drop percentage, it can thus be seen that the two is relatively；
By comparison L2 phase actual pressure drop percentage and theoretical pressure drop percentage, it can thus be seen that the two is relatively；Compare L3 phase
Actual pressure drop percentage and theoretical pressure drop percentage, it can thus be seen that the two is relatively, therefore, using it is of the invention not
The calculation method of evenly dispersed load end pressure drop calculates the voltage drop value of cable end piece, and calculated result is close practical
Value, it is more accurate and reliable, improve the practicability of the calculation method of uneven dispersion load end pressure drop.
Embodiment 2
The calculation method of uneven dispersion load end pressure drop is applied to the selection of cable model
Determine the initial load voltage U of power supply0, total number of segment N of cable, every section of scatteredload cable length Ln, three-phase line
Loss of voltage percentage Δ Ua%, pressure drop percentage Δ U% are counter to push away and every section of cable general power P is calculatedn, according to every section
Cable general power Pn, and every section of cable general power corresponding with cable model in the prior art compares, and selects optimal electricity
Cable model.
The check and correction of cable model selection
Determine the initial load voltage U of power supply0, total number of segment N of cable, every section of scatteredload cable length Ln, three-phase line
Loss of voltage percentage Δ Ua%, and every section of cable general power P is determined according to selected cable modeln, pressure drop hundred is calculated
Divide ratio, if pressure drop percentage is less than or equal to 5%, meets the requirements.
Embodiment 3
The calculation method of uneven dispersion load end pressure drop is applied to the selection of cable model
A cable model is predefined, determines the initial load voltage U of power supply later0, cable total number of segment N, every section dispersion
The length L of load cablen, three-phase line loss of voltage percentage Δ Ua%, and determined often according to previously selected cable model
Section cable general power Pn, pressure drop percentage Δ U% is calculated.
If pressure drop percentage Δ U% is less than or equal to 5%, the selection of cable model is met the requirements, if pressure drop percentage is big
In 5%, the selection of cable model is replaced, and determines a cable model again, calculates pressure drop percentage Δ later
U%, until pressure drop percentage Δ U% is less than or equal to 5%, to complete the selection of cable model.
Select cable model for VV-0.6/4*16mm for the first time2Copper cable, power factor 0.85, the initial voltage of power supply
For 380V, loss of voltage percentage 0.512%/(MWkm) of three-phase line, load has a street lamp on every section of cable, and every section
Cable general power is that cable powering and lamp power are superimposed, and obtains stagnation pressure by theoretical calculation and is reduced to 14.97V, pressure drop percentage
It is 3.94%, since pressure drop percentage is less than 5%, meets the requirements, therefore cable model is VV-0.6/4*16mm2Copper cable, cable
Model selects calculated result as shown in table 4.
4 cable model of table selects calculated result
| Street lamp number D0n | Lamp power/kW | Cable length Ln/m | Electric current/A | Voltage/V | Pressure drop/V |
| D01 | 1.8 | 37 | 24.935828 | 378.20494 | 1.79506 |
| D02 | 1.8 | 37 | 21.821383 | 376.6415 | 1.56344 |
| D03 | 1.8 | 35 | 18.665747 | 375.381671 | 1.259829 |
| D04 | 0.45 | 36 | 15.47128 | 374.311208 | 1.070463 |
| D05 | 0.45 | 35 | 14.698918 | 373.325255 | 0.985953 |
| D06 | 0.45 | 32 | 13.918975 | 372.473892 | 0.8513626 |
| D07 | 0.45 | 35 | 13.130155 | 371.597489 | 0.8764027 |
| D08 | 0.45 | 35 | 12.338552 | 370.775862 | 0.8216275 |
| D09 | 0.45 | 35 | 11.541501 | 370.00901 | 0.7668523 |
| D010 | 0.45 | 35 | 10.739319 | 369.296932 | 0.7120772 |
| D011 | 0.45 | 35 | 9.932332 | 368.63963 | 0.657302 |
| D012 | 0.45 | 38 | 9.120872 | 367.985458 | 0.654172 |
| D013 | 0.45 | 33 | 8.306442 | 367.469007 | 0.5164516 |
| D014 | 0.45 | 35 | 7.486305 | 366.97603 | 0.4929765 |
| D015 | 0.45 | 35 | 6.663432 | 366.537829 | 0.4382013 |
| D016 | 0.45 | 35 | 5.837474 | 366.154403 | 0.3834262 |
| D017 | 0.45 | 33 | 5.008788 | 365.844532 | 0.3098709 |
| D08 | 0.45 | 35 | 4.177526 | 365.570656 | 0.2738758 |
| D019 | 0.45 | 35 | 3.344524 | 365.351555 | 0.2191007 |
| D020 | 0.45 | 34 | 2.509898 | 365.191925 | 0.1596305 |
| D021 | 0.45 | 35 | 1.673996 | 365.082375 | 0.1095503 |
| D022 | 0.45 | 35 | 0.837249 | 365.0276 | 0.05477517 |
Claims (9)
1. the calculation method of uneven dispersion load end pressure drop, characterized by the following steps:
A: the electricity of the initial load voltage of power supply, total number of segment of cable, the length of every section of scatteredload cable, three-phase line is determined
Crushing loses percentage, and determines every section of cable general power according to cable model；
B: according to the initial load voltage of power supply, total number of segment of cable, the length of every section of scatteredload cable, three-phase line electricity
Crushing loses percentage, every section of cable general power, and scatteredload electric current, the scatteredload voltage, cable of every section of cable is calculated
Voltage drop；
C: every section of cable voltage drop is superimposed, overall presure drop is calculated；
D: according to the initial load voltage of power supply, and overall presure drop is utilized, pressure drop percentage is calculated.
2. the calculation method of uneven dispersion load according to claim 1 end pressure drop, it is characterised in that: in step B,
Scatteredload electric current, scatteredload voltage, the cable voltage drop of first segment are calculated using following methods:
(1) it is superimposed, calculates to last one section of cable general power according to the initial load voltage of power supply, first segment cable general power
To the scatteredload electric current of first segment；
(2) according to the length of scatteredload cable of first segment, the initial load voltage of power supply, three-phase line the loss of voltage hundred
Score, and using the scatteredload electric current of first segment, the cable voltage drop of first segment is calculated；
(3) according to the initial load voltage of power supply, and using the cable voltage drop of first segment, the dispersion that first segment is calculated is negative
Charged pressure.
3. the calculation method of uneven dispersion load according to claim 1 end pressure drop, it is characterised in that: definition, electricity
Total number of segment of cable is N, and N is the integer greater than 1, and any one section in the total number of segment of cable is n, and n is 1 integer for arriving N；Step
In B, n-th section of scatteredload electric current, scatteredload voltage, cable voltage drop are calculated using following methods:
(1) the scatteredload voltage of n-1 sections of foundation, n-th section of cable general power are superimposed to N sections of cable general powers, are calculated
N-th section of scatteredload electric current；
(2) according to n-th section the length of scatteredload cable, n-1 sections of scatteredload voltage, three-phase line the loss of voltage hundred
Score, and using n-th section of scatteredload electric current, n-th section of cable voltage drop is calculated；
(3) according to n-1 sections of scatteredload voltage, and using n-th section of cable voltage drop, it is negative that n-th section of dispersion is calculated
Charged pressure.
4. the calculation method of uneven dispersion load according to claim 3 end pressure drop, it is characterised in that: in step B,
The calculation formula of n-th section of scatteredload electric current are as follows:
The calculation formula of n-th section of cable voltage drop are as follows:
ΔUn=Un-1*In*Ln*ΔUa%/100
The calculation formula of n-th section of scatteredload voltage are as follows:
Un=Un-1-ΔUn
In formula:
Power factor；
In: n-th section of scatteredload electric current, unit A；
Pn: n-th section of cable general power, unit kW；
Un: n-th section of scatteredload voltage, unit V；
ΔUn: n-th section of scatteredload voltage drop, unit V；
Ln: the length of n-th section of scatteredload cable, unit m；
ΔUa%: the loss of voltage percentage of three-phase line, unit %Akm.
5. the calculation method of uneven dispersion load according to claim 4 end pressure drop, it is characterised in that: in step C,
The calculation formula of overall presure drop are as follows:
6. the calculation method of uneven dispersion load according to claim 5 end pressure drop, it is characterised in that: in step D,
The calculation formula of pressure drop percentage are as follows:
In formula:
U0: the initial load voltage of power supply, unit V；
Δ U%: pressure drop percentage.
7. utilizing answering for the calculation method of the uneven dispersion load end pressure drop as described in any one of claim 1-6
With, it is characterised in that: determine the initial load voltage of power supply, total number of segment of cable, the length of every section of scatteredload cable, three-phase
Every section of cable general power is calculated in the loss of voltage percentage of route, pressure drop percentage, selects according to every section of cable general power
Suitable cable model.
8. the calculation method of uneven dispersion load according to claim 7 end pressure drop, it is characterised in that: pressure drop percentage
Than being less than or equal to 5%.
9. utilizing answering for the calculation method of the uneven dispersion load end pressure drop as described in any one of claim 1-6
With, it is characterised in that: a cable model is predefined, and determines the initial load voltage of power supply, total number of segment of cable, every section
The loss of voltage percentage of the length of scatteredload cable, three-phase line, and every section of cable is determined according to pre-selected cable model
Pressure drop percentage is calculated in general power, if pressure drop percentage is less than or equal to 5%, the selection of cable model is met the requirements, if
Pressure drop percentage is greater than 5%, selects cable model again and calculates pressure drop percentage, until pressure drop percentage is less than or equal to 5%,
To complete the selection of cable model.
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