CN106298215B - A kind of distribution transformer design method - Google Patents
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- 238000009826 distribution Methods 0.000 title claims abstract description 202
- 238000013461 design Methods 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 claims abstract description 43
- 238000009413 insulation Methods 0.000 claims description 18
- 230000017525 heat dissipation Effects 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000010206 sensitivity analysis Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 23
- 238000004804 winding Methods 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000007728 cost analysis Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
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- 239000011229 interlayer Substances 0.000 description 1
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Abstract
The invention provides a kind of distribution transformer design method based on manufacturing cost and running environment, including step 1：Configure the design of distribution transformer to be designed；Step 2：Determine distribution transformer running environment requirement to be designed；Step 3：Set the manufacturing cost C and performance indications of distribution transformer in every kind of design；Step 4：The overall life cycle cost LCC of distribution transformer more to be designed and different type distribution transformer, limits its manufacturing cost C.Compared with prior art, a kind of design method of distribution transformer provided by the invention, by the overall life cycle cost model for establishing distribution transformer, analyze its each several part cost structure, sensitivity analysis is carried out to various pieces cost, with reference to the manufacturing cost of the distribution transformer with identical overload capacity, the overall life cycle cost increase of distribution transformer to be designed is limited, so as to improve the Technical Economy of distribution transformer to be designed.
Description
Technical Field
The invention relates to the field of transformers, in particular to a design method of a distribution transformer.
Background
The overload capacity of the conventional oil-immersed 10kV distribution transformer is designed and manufactured mainly according to the GB 1094.7-2008 regulation, the overload capacity of the transformer is defined by a plurality of limit values such as load current, hot spot temperature, top layer oil temperature and the temperature of metal parts except for a winding and a lead wire, namely the hot spot temperature, the top layer oil temperature and the temperature of the metal parts except for the winding and the lead wire of the distribution transformer are limited together, and if 1 of the limit values is out of limit, other items need to be reduced correspondingly. Therefore, the temperature rise of the metal parts caused by the magnetic leakage of the iron core can be reduced by improving the heat resistance of related elements and insulating parts, the heat dissipation capacity in the winding is enhanced, the bearing capacity of external members such as an oil tank and a radiating fin is enhanced, and the overload capacity of the distribution transformer can be theoretically improved.
The distribution transformer with high overload capacity (hereinafter referred to as 'high overload distribution transformer') is a transformer capable of bearing overload operation for a certain time, and reduces the temperature influence of windings on oil by increasing the number of oil passages of high and low voltage windings (namely increasing the inner heat dissipation area) so as to prevent the local overheating of the coils after the transformer is overloaded; the temperature rise of the top oil of the transformer to the external air is reduced by increasing the heat dissipation area of the oil tank; by selecting high-temperature-resistant insulating materials, the insulating oil improves the heat resistance and the like of related elements and insulating parts, the overload operation capacity of the distribution transformer is integrally improved, and the whole life cycle is not reduced. However, measures such as increasing the distribution oil passage and the external heat dissipation area, and improving the insulation heat-resistant grade of the material will increase the manufacturing cost and reduce the economy of the high overload distribution.
In summary, it is desirable to provide a method for designing a distribution transformer, which reduces the manufacturing cost of the high overload distribution transformer to a certain extent on the basis of ensuring the technical performance of the high overload distribution transformer.
Disclosure of Invention
To meet the needs of the prior art, the present invention provides a method of designing a distribution transformer.
The technical scheme of the invention is as follows:
step 1: configuring a design scheme of a distribution transformer to be designed;
step 2: determining the operating environment requirement of the distribution transformer to be designed;
and step 3: determining the manufacturing cost C and the performance index of the distribution transformer in each design scheme;
and 4, step 4: and comparing the full life cycle cost LCC of the distribution transformer to be designed with that of different types of distribution transformers, and limiting the manufacturing cost C.
Preferably, the design scheme in step 1 is one of the following three design schemes:
according to the first design scheme, a first design method and a second design method are adopted to improve the overload capacity of the distribution transformer;
according to the second design scheme, the overload capacity of the distribution transformer is improved by simultaneously adopting a first design method, a second design method and a third design method;
according to the third design scheme, the overload capacity of the distribution transformer is improved by simultaneously adopting a first design method, a second design method, a third design method and a fourth design method;
preferably, the first design method is to adjust the number of oil passages inside the distribution transformer;
the second design method is used for adjusting the heat dissipation area outside the distribution transformer;
the third design method is to change the material types of all parts in the distribution transformer so as to improve the insulation heat-resisting grade of the distribution transformer;
the fourth design method is to change the type of the transformer oil in the distribution transformer so as to improve the high temperature resistance and the insulation grade of the transformer oil;
preferably, the step 3 of determining the operating environment requirement of the distribution transformer includes calculating an annual average load rate, a maximum load and a maximum load growth rate of a distribution area where the distribution transformer is located;
preferably, the performance index of the distribution transformer in step 3 includes: no-load loss, short-circuit impedance, and overload capability;
preferably, the step 4 of comparing the life cycle cost LCC of the distribution transformer to be designed with the life cycle cost LCC of different types of distribution transformers to define the manufacturing cost C thereof includes:
step 4-1: constructing an objective function min (LCC, C-omega) for optimizing the design scheme;
wherein C is the manufacturing cost of the distribution transformer to be designed, and omega is the total manufacturing cost of a standard distribution transformer with the same capacity as the distribution transformer to be designed;
step 4-2: determining an optimal design scheme according to the calculation result of the objective function min (LCC, C-omega), if the total manufacturing cost of all the design schemes is the same, analyzing the influence degree of each cost in the LCC of the life cycle cost of each design scheme on the reduction of the LCC of the life cycle cost, and selecting the design scheme with the lowest influence degree as the optimal design scheme;
preferably, the step 4-2 of the full life cycle cost LCC includes: operating cost C of distribution transformerCOMaintenance cost C of distribution transformerCMFault cost of distribution transformer CCFAnd decommissioning disposal cost C of the transformerCD；
Preferably, the determining the optimal constraint conditions of the design scheme in step 4 specifically includes:
cost constraints of distribution transformers: (C-omega)/omega < a;
overload limiting condition of distribution transformer:
the operating environment limiting conditions of the distribution transformer area comprise that the annual average load rate beta is less than c and the maximum load Pmaxd, the maximum load growth rate alpha is less than e;
wherein S is the rated capacity of the distribution transformer,a, b, c, d and e are threshold values for the power factor of the distribution transformer;
preferably, the step 4 defines the manufacturing cost C thereof, and includes:
calculating the manufacturing cost C of a standard distribution transformer having the same capacity as the distribution transformer to be designed1And full life cycle cost LCC1And calculating the manufacturing cost C of a standard distribution transformer having the same overload capacity as the distribution transformer to be designed2And full life cycle cost LCC2；
Respectively comparing the full life cycle cost LCC of the distribution transformer to be designed with the full life cycle cost LCC1And full life cycle cost LCC2And comparing to determine the value range of the manufacturing cost C of the distribution transformer to be designed.
Compared with the closest prior art, the excellent effects of the invention are as follows:
according to the design method of the distribution transformer, the increase of the total life cycle cost of the distribution transformer to be designed is limited by referring to the manufacturing cost of the distribution transformer with the same overload capacity, an optimization model based on the total life cycle cost of the distribution transformer is established, meanwhile, sensitivity analysis is carried out on each part of cost, and the technical economy of the distribution transformer to be designed is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1: the invention discloses a design method flow chart of a distribution transformer;
FIG. 2: the current process curve applied by the temperature rise test of the high overload distribution transformer in the embodiment of the invention;
FIG. 3: the design schematic diagram of the high overload distribution transformer in the embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The design method of the distribution transformer provided by the invention is characterized in that an overload performance verification scheme of the distribution transformer is formulated based on the load characteristics of a power grid region; based on cost constraints, a full life cycle cost analysis model of a distribution transformer is established, so as to determine an optimal design scheme of the distribution transformer, as shown in fig. 1 and 3, the design method of the distribution transformer is as follows:
1. and configuring a design scheme of the distribution transformer to be designed.
The present embodiment includes three design schemes, each of which is composed of a different design method. Wherein,
the first design scheme is that the overload capacity of the distribution transformer is improved by simultaneously adopting a first design method and a second design method.
The second design scheme is that the overload capacity of the distribution transformer is improved by simultaneously adopting the first design method, the second design method and the third design method,
and the third design scheme is that the overload capacity of the distribution transformer is improved by simultaneously adopting the first design method, the second design method, the third design method and the fourth design method.
Wherein,
the four design methods are as follows:
first, a first design method refers to adjusting the number of oil passages inside a distribution transformer.
For example, the number of internal oil passages of the transformer is increased, namely the heat dissipation areas of high and low voltage windings of the transformer are increased, the volume of the transformer is indirectly increased, and the cost is increased by transformer oil and iron materials.
②, second design method, refers to adjusting the heat dissipation area outside the distribution transformer.
For example, the heat sink area of the transformer is increased, the volume and weight of the transformer are indirectly increased, and the cost is increased by transformer oil and iron materials.
thirdly, a third design method is to change the types of the insulating materials of all parts in the distribution transformer so as to improve the insulating heat-resisting grade of the distribution transformer;
for example, the insulation heat-resistant grade of materials of a coil, a transformer body and the like is improved, a conventional distribution transformer adopts an A-grade insulation heat-resistant material, and the cost is mainly increased by the insulation material.
fourthly, a fourth design method is used for changing the type of the transformer oil in the distribution transformer so as to improve the high temperature resistance and the insulation grade of the transformer oil.
For example, using high temperature resistant insulating oil, the oil has a flash point and a fire point greater than 150 ℃, adding to the cost of transformer oil.
In this embodiment, improve distribution transformer inside insulation heat resistance level, mainly have two kinds of schemes:
the other is that the insulation material of the winding and the transformer body is selected according to the temperature of different parts of the winding and the transformer body, and the hot spot temperature of the winding is controlled. Specifically, the coil adopts a semi-hybrid insulation structure, the interlayer insulation of the hottest point temperature part of the transformer body adopts F-level insulation material, and the lead adopts F-level insulation enameled wire;
on the basis of the conventional distribution transformer structure design, the overload capacity of the distribution transformer is improved by adopting an F-level uniform high-temperature insulation system, and all the materials are F-level insulation materials which can resist temperature higher than 150 ℃.
In summary, the design scheme of the distribution transformer in this embodiment is shown in table 1:
TABLE 1
In the embodiment of the invention, the overload performance of the distribution transformer is detected by adopting a temperature rise test, as shown in figure 2, the maximum temperature rise of each part of the distribution transformer is monitored by applying different currents, so that the heat resistance of the insulating material is compared, and the overload performance of the distribution transformer is ensured. Wherein, the temperature rise limit values of different insulation heat-resisting grades are shown in table 2:
TABLE 2
| Name (R) | Class a insulation | Class B insulation | Class F insulation |
| Top oil (K) | 60 | 80 | 100 |
| Winding (average) (K) | 65 | 85 | 100 |
| Winding (hotspot) (K) | 75 | 95 | 110 |
| An iron core,Fuel tank and structure surface (K) | 60 | 80 | 100 |
2. And determining the operating environment requirement of the distribution transformer to be designed.
And (3) researching the operation condition of the distribution transformer with the same capacity as that of the distribution transformer to be designed, and analyzing the load characteristics of the distribution transformer area where the distribution transformer to be designed is located, wherein the load characteristics comprise the annual average load rate, the maximum load and the maximum load growth rate of the distribution transformer area.
3. Determining the manufacturing cost C and the performance index of the distribution transformer in each design scheme;
(1) manufacturing cost
Including the core of the distribution transformer iron, the area of the heat sink, the high voltage wire, the low voltage wire, the insulation, the transformer oil, the clip, the mailbox, the assembly, and the cost of the process level.
(2) Performance index
Including no-load loss, short-circuit impedance and overload capability of distribution transformer
4. And analyzing the full Life Cycle Cost (LCC) of each design scheme to determine the optimal design scheme.
(1) And establishing a distribution transformer full life cycle cost model, analyzing the cost of each part in the distribution transformer full life cycle LCC, carrying out sensitivity analysis, and analyzing the relation between the economy of the distribution transformer and the full life cycle LCC.
The calculation formula of the full life cycle cost LCC of the design scheme of the distribution transformer is as follows:
LCC＝CCI+CCO+CCM+CCF+CCD(1)
wherein, CCIInitial investment costs for distribution transformers; cCOThe calculation formula of the running cost of the distribution transformer is as follows:
CCMfor the maintenance cost of the distribution transformer, the calculation formula is as follows:
CCFthe calculation formula of the fault cost of the distribution transformer is as follows:
CCDfor the decommissioning disposal cost of the transformer, the calculation formula is as follows:
wherein, CcoFor annual operating costs of distribution transformers, CxxFor a single minor overhaul of the distribution transformer, CdxFor a single major overhaul of the distribution transformer, CcfAnnual fault loss cost for distribution transformers, CcdThe method comprises the steps of calculating the decommissioning disposal cost of the distribution transformer before conversion, wherein T is the operation life of the distribution transformer, U is the large overhaul frequency of the distribution transformer, R is the inflation rate of the goods and R is the social discount rate.
The single small overhaul of the distribution transformer refers to maintenance overhaul, the overhaul period is 1 time per year, and the single overhaul cost accounts for about 1.5% of the manufacturing cost of the distribution transformer.
The single large overhaul of the distribution transformer refers to comprehensive detection, the overhaul period is 5 years and 1 time, and the single overhaul cost accounts for about 6% of the cost of the distribution transformer.
(2) Full life cycle cost analysis of distribution transformer design
Calculating sensitivity indexes of all costs in the full life cycle cost LCC, analyzing the sensitivity indexes, and determining the cost type with the largest influence on the full life cycle cost; the sensitivity index includes:
initial investment cost CCISensitivity index of
Running cost CcoSensitivity index of
Cost of overhaul CxxSensitivity index of
Cost of overhaul CdxSensitivity index of
Cost of failure loss CcfSensitivity index of
Retirement disposal cost CcdSensitivity index of
(3) In this example, the LCC analysis is performed using the high overload distribution transformation, the same capacity conventional distribution transformation, and the 1.5 times capacity conventional distribution transformation. For example, the distribution transformer is silicon steel S11, the capacity is 100kVA, and the service life is 20 years. The purchase price of the equipment is quoted from an equipment manufacturer, the loss parameters can be obtained from a nameplate of the transformer, the accident rate, the obstacle rate and the defect rate are the same, and then the sensitivity index can be determined as follows:
it can be seen from the sensitivity indexes of the cost of each part that the total life cycle cost LCC of the transformer is sensitive to the annual operation cost, the single small overhaul cost and the annual fault loss cost, and the LCC is greatly changed along with the change of the above 3 parameters. As the maintenance cost and the fault cost of the 10kV distribution transformer are basically the same, the operation cost has great influence on the LCC of the transformer, the operation cost mainly comprises energy consumption cost, the lower energy consumption cost is a key measure for reducing the LCC of the transformer, and the distribution transformer energy consumption cost has a larger relation with the load characteristic index.
5. Comparing the life cycle cost LCC of different types of distribution transformers, limiting the manufacturing cost C of the distribution transformer to be designed, wherein the manufacturing cost can also be the purchasing cost in the embodiment, specifically:
(1) calculating the manufacturing cost C of a standard distribution transformer having the same capacity as the distribution transformer to be designed1And full life cycle cost LCC1And calculating the manufacturing cost C of a standard distribution transformer having the same overload capacity as the distribution transformer to be designed2And full life cycle cost LCC2。
(2) Respectively comparing the full life cycle cost LCC of the distribution transformer to be designed with the full life cycle cost LCC1And full life cycle cost LCC2And comparing to determine the value range of the manufacturing cost C of the distribution transformer to be designed. Taking A, B, C three schemes as an example, CAManufacture of distribution transformers to be designedCost, CBCost of manufacture of standard distribution transformers of the same capacity, CCFor the same overload capacity standard distribution transformer manufacturing cost, if LCCA<LCCBAnd LCCA<LCCCThereby making a basis for manufacturing the display CBAnd manufacturing cost CCLimiting cost CA。
Example (b):
the load characteristic index 1 of the transformer area is that the annual average load rate β is 20 percent and the maximum load is Pmax80kW, 3% of maximum load growth rate, 25% of annual average load rate, and P of maximum loadmaxthe maximum load increase rate α of 68kW in the first 10 years is 5%, and the maximum load is stable in the last 10 years, the calculation results of the life cycle costs of the different types of distribution transformers are shown in table 3:
TABLE 3
The maximum load of the two load characteristic indexes reaches 140.28kW and 136.52kW respectively in a target year, the overload of the distribution transformer reaches 1.5 times by adopting the conventional 100kVA, and the fault probability of the distribution transformer reaches 9.8 times under the rated condition according to the risk evaluation of the distribution transformer. The method specifically comprises the following steps:
load characteristic index 1: in the first 15 years, the maximum load is less than 1.5 times of the rated capacity, and in the last 5 years, the maximum load is more than 1.5 times of the rated capacity; load characteristic index 2: in the first 10 years, the maximum load is less than 1.5 times of the rated capacity, and in the last 10 years, the maximum load is more than 1.5 times.
For the load characteristic index 1, the purchase price of the high overload distribution transformer can be obtained by equation (8):
1.27C+38674.22<65456.94 (8)
c <21088.76 element
For the load characteristic index 2, the distribution transformer energy consumption cost with the capacity of 100kVA is far more than 160kVA, and the distribution transformer fault loss cost caused by overload risk is also high, the load characteristic index is suitable for the distribution transformer with the large capacity, and if the purchase price of the high overload distribution transformer is lower than 20492.31 yuan, the load characteristic index is still optimal, and the concrete formula (9) is shown.
1.27C+40024.35<66049.59 (9)
C <20492.31 element
In the load characteristic index 2, when the annual average load factor is 0.3 and the remaining conditions are unchanged, y is less than 18194.4 yuan.
(3) And determining an optimal design scheme.
①, constructing an objective function min (LCC, C-omega) of an optimized design scheme;
where C is the manufacturing cost of the distribution transformer to be designed, and ω is the manufacturing cost of the standard distribution transformer having the same capacity as the distribution transformer to be designed.
If the first design scheme is adopted, the cost increased by the distribution transformer is mainly the cost for increasing the inner and outer heat dissipation areas of the transformer: high-voltage winding heat dissipation area increase value g1The increased value d of the heat dissipation area of the low-voltage winding1The area w of the external radiating fin is increased1Adding insulating material j1Total of C- ω ═ g1+d1+w1+j1；
For the same reason, the second design solution increases the cost by C- ω ═ g2+d2+w2+j2The third design increases the cost by C- ω -g3+d3+w3+j3. The difference between the distribution transformer to be designed and the standard distribution transformer is shown in table 4, that is, the difference between the high overload distribution transformer and the conventional distribution transformer in this embodiment is:
TABLE 4
②, determining an optimal design scheme according to the calculation result of the objective function min (LCC, C-omega), if the total manufacturing cost of all the design schemes is the same, analyzing the influence degree of each cost in the LCC of the whole life cycle cost of each design scheme on the reduction of the LCC of the whole life cycle cost, and selecting the design scheme with the lowest influence degree as the optimal design scheme.
In this embodiment, on the basis of ensuring the performance of the distribution transformer, the first design scheme is substantially the same as the conventional distribution transformer with the overload performance, but the cross section of the wire is smaller than that of the conventional distribution transformer, so that the heat generation amount of the wire is large during overload operation, and the aging speed of the wire is accelerated. If the investment of the three design schemes is the same, the volume and the weight of the first design scheme are larger than those of the second design scheme and the third design scheme, the size and the weight of the first design scheme are the same as those of the second design scheme and the third design scheme, the installation and maintenance cost of the distribution transformer is increased, and the cost is not reduced. Therefore, the high overload distribution transformer design scheme adopts the second design scheme or the third design scheme.
thirdly, determining the limit conditions of the optimal design scheme, specifically:
cost constraints of distribution transformers: (C-omega)/omega < a;
overload limiting condition of distribution transformer:
the operating environment limiting conditions of the distribution transformer area comprise that the annual average load rate beta is less than c and the maximum load Pmaxd, the maximum load growth rate alpha is less than e;
wherein S is the rated capacity of the distribution transformer,a, b, c, d, and e are thresholds for the power factor of the distribution transformer.
Finally, it should be noted that: the described embodiments are only some embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (7)
1. A method of designing a distribution transformer, the method comprising:
step 1: configuring a design scheme of a distribution transformer to be designed;
step 2: determining the operating environment requirement of the distribution transformer to be designed;
and step 3: determining the manufacturing cost C and the performance index of the distribution transformer in each design scheme;
and 4, step 4: comparing the full life cycle cost LCC of the distribution transformer to be designed and different types of distribution transformers, and limiting the manufacturing cost C;
comparing the full life cycle cost LCC of the distribution transformer to be designed and distribution transformers of different types in the step 4, and limiting the manufacturing cost C, wherein the method comprises the following steps:
step 4-1: constructing an objective function min (LCC, C-omega) for optimizing the design scheme;
wherein C is the manufacturing cost of the distribution transformer to be designed, and omega is the total manufacturing cost of a standard distribution transformer with the same capacity as the distribution transformer to be designed;
step 4-2: determining an optimal design scheme according to the calculation result of the objective function min (LCC, C-omega), if the total manufacturing cost of all the design schemes is the same, analyzing the influence degree of each cost in the LCC of the life cycle cost of each design scheme on the reduction of the LCC of the life cycle cost, and selecting the design scheme with the lowest influence degree as the optimal design scheme;
the determining of the optimal design solution in step 4 includes:
cost constraints of distribution transformers: (C-omega)/omega < a;
overload limiting condition of distribution transformer:
the operating environment limiting conditions of the distribution transformer area comprise that the annual average load rate beta is less than c and the maximum load Pmaxd, the maximum load growth rate alpha is less than e;
wherein S is the rated capacity of the distribution transformer,a, b, c, d, and e are thresholds for the power factor of the distribution transformer.
2. The method of claim 1, wherein the design in step 1 is one of three designs:
according to the first design scheme, a first design method and a second design method are adopted to improve the overload capacity of the distribution transformer;
according to the second design scheme, the overload capacity of the distribution transformer is improved by simultaneously adopting a first design method, a second design method and a third design method;
and in the third design scheme, the overload capacity of the distribution transformer is improved by simultaneously adopting a first design method, a second design method, a third design method and a fourth design method.
3. The method of claim 2,
the first design method is used for adjusting the number of oil passages in the distribution transformer;
the second design method is used for adjusting the heat dissipation area outside the distribution transformer;
the third design method is to change the material types of all parts in the distribution transformer so as to improve the insulation heat-resisting grade of the distribution transformer;
the fourth design method is to change the type of transformer oil in the distribution transformer so as to improve the high temperature resistance and the insulation grade of the transformer oil.
4. The method of claim 1, wherein determining the distribution transformer operating environment requirements in step 3 comprises calculating an annual average load rate, a maximum load, and a maximum load growth rate for the distribution transformer in the distribution area.
5. The method of claim 1, wherein the performance metrics of the distribution transformer in step 3 comprise: no-load loss, short-circuit impedance, and overload capability.
6. The method of claim 1, wherein the step 4-2 of full life cycle cost, LCC, comprises: operating cost C of distribution transformerCOMaintenance cost C of distribution transformerCMFault cost of distribution transformer CCFAnd the decommissioning site of the transformerSetting cost CCD。
7. The method according to claim 1, wherein the step 4 defines a manufacturing cost C thereof, comprising:
calculating the manufacturing cost C of a standard distribution transformer having the same capacity as the distribution transformer to be designed1And full life cycle cost LCC1And calculating the manufacturing cost C of a standard distribution transformer having the same overload capacity as the distribution transformer to be designed2And full life cycle cost LCC2；
Respectively comparing the full life cycle cost LCC of the distribution transformer to be designed with the full life cycle cost LCC1And full life cycle cost LCC2And comparing to determine the value range of the manufacturing cost C of the distribution transformer to be designed.
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