CN104778552A - Village-level power grid configuring and implementing method - Google Patents
Village-level power grid configuring and implementing method Download PDFInfo
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Abstract
The invention relates to a village-level power grid configuring and implementing method. The village-level power grid configuring and implementing method comprises the following steps: 1, selecting typical configuration schemes for power supply facilities of village-level power grids, wherein four typical configuration schemes meeting requirements of the village-level power grids in different regions on power supply schemes comprise N-A typical configuration, N-B typical configuration, N-C typical configuration and N-D typical configuration; 2, determining power supply modes of the village-level power grids, wherein according to different residential forms of rural residents in different regions, three power supply modes, namely a tandem residential region power supply mode, a disperse residential region power supply mode and a tandem/disperse residential region power supply mode, can be selected; 3, selecting facilities and mounting the facilities, wherein after a typical configuration scheme and a power supply mode of a low-voltage distribution network are detected, the facilities are selected and mounted. By the village-level power grid configuring and implementing method, the power supply reliability of a rural power grid is improved, the line loss rate of the rural power grid is reduced, and the problems of low voltage and bottlenecks of a rural power distribution network are solved.
Description
Technical field
The present invention relates to Rural Power Grid Construction field, be specifically related to the low pressure Typical Disposition of at village level electrical network and the method for enforcement--the configuration of at village level electrical network, implementation method.
Background technology
Guo Wang Hebei Utilities Electric Co. service area covers Shijiazhuang, Handan, Baoding, Xingtai, Cangzhou, six, Hengshui districts and cities, has villages (towns) power supply station 1156 under its command, carries the power supply task of Southern Hebei 31733 administrative villages, 4,986 ten thousand populations.Electricity sales amount 1,421 hundred million kilowatt hour in 2013, rural power grids power supply reliability 99.894%.At present, Rural Electric Power is in great demand, although through three-wheel upgrading of rural power grids upgrading engineering construction, current at village level Distribution network entirety is comparatively weak, " seize by the throat " and low-voltage problem is still given prominence to, urban residents' need for electricity is limited in reduced levels.In the past at village level power grid construction transformation does not combine with planning, construction criteria is lower, various places implementation status is not quite similar, and adopt " sewing up " construction mode, the situation of duplicate construction is serious.Therefore, at village level electrical network is badly in need of changing.
Summary of the invention
Of the present invention
goal of the inventionbased on existing rural power grids and distribution network technology specification, in conjunction with the needs of company's rural power grids development construction, design a set of Typical Disposition, the implementation method that meet at village level electrical network feature, to promote construction quality, and then improve rural power grids power supply reliability, reduction rural power grids line loss per unit, problem such as solution Rural Power Distribution Network low-voltage and " seizing by the throat " etc.
technical scheme of the present invention is:
The configuration of the at village level electrical network of the present invention, implementation method, method step is as follows:
step one: the Typical Disposition scheme selecting at village level mains supply facility
At village level Electric Power Network Planning and when building, should consider the Rural Economic Development Levels of different regions, per capita year power consumption situation and the factor such as load density, option and installment is carried out to power-supply units such as 10kV circuit, substation transformer, 0.4kV circuits.The present invention determines four kinds of Typical Disposition schemes by investigating and studying than choosing, to adapt to the at village level electrical network in different regions to the demand of power supply plan, and specifically can according to the corresponding allocation plan of following Standard Selection:
1) amount is greater than 120 families, and electricity is greater than the rural area, Plain (containing little industry and commerce) of 2800kWh/ or N-A Typical Disposition can be selected by other applicable villages per family.
2) amount is greater than 120 families, and electricity is less than the rural area, Plain (containing little industry and commerce) of 2800kWh/ or N-B Typical Disposition can be selected by other applicable villages per family.
3) amount is less than the mountainous rural area at 120 families or N-C Typical Disposition can be selected by other applicable villages.
4) N-D Typical Disposition can be selected in New Residence community.
Described N-A, N-B, N-C, N-D Typical Disposition scheme is: (in once each scheme
1, N-A Typical Disposition scheme
1) scheme basic composition
This typical scenario is made up of N-A-200, N-A-400, N-A-600 tri-subschemes.Wherein N-A-200 is 3 area schemes, amount 200 family, corresponding village; N-A-400 is 6 area schemes, amount 400 family, corresponding village; N-A-600 is 9 area schemes, amount 600 family, corresponding village.
(described district refers to service area or the region of a transformer herein; Such as: the meaning of " N-B-200 is 3 area schemes " refers to that N-B-200 scheme is 3 area schemes comprising 3 transformers, once unreceipted district all refer to 1 area scheme)
2) distribution transformer capacity is selected
The load level that distribution transformer capacity presses the year two thousand twenty is considered, adopts 200kVA; Load density larger area can be considered to adopt 315kVA.
3) distribution transformer platform pattern
The height of 10kV route lever can be coordinated in principle, select in 10 meters of-10 meters half fractions of 10-ZA-1-D-01,12 meters of-12 meters half fractions, 15 meters of-15 meters half fractions, 10 meters-10 meters full fractions, four kinds of modes from " State Grid Corporation of China rural power grids 10kV rural power grids 10kV pole type transformer platform General design scheme construction atlas ".
4) platform connecting system is become
Distribution transformer platform should access 10kV branched line through disconnector, and disconnector load side can adopt pole line or cable to the circuit become between platform high-pressure side.Should protect by the requirement zinc oxide surge arresters of relevant code when adopting cable.
5) low-pressure line-outgoing switch and reactive-load compensation
(1) step down side is generally by 2 road low-pressure line-outgoing configurations.Time necessary, also can by 3 tunnel outlet configurations.
(2) transformation low-pressure side installs the reactive power automatic compensation device of automatic switching.
(3) low-pressure line-outgoing switch and reactive power compensator unification are arranged in JP cabinet.
6) primary cable section selection and low-voltage circuit length
Primary cable cross section goes out No. 2 low-voltage lines consider by the final scale 315kVA of substation transformer, every platform transformer, and backbone selects 70mm
2insulated conductor, branch line select 50mm
2insulated conductor.Low pressure backbone length should be no more than 150 meters, and transformer should be no more than 250 meters to the actual track length of terminal temperature difference.
7) counter box
(1) this programme resident unifies employing 1 epi-position anti-theft meter case, is installed on open air.
(2) three-phase power user adopts 1 epi-position anti-theft meter case dispersion to install, but also should be installed on open air.
, N-B Typical Disposition scheme
N-B class rural power grids typical design solution, is applicable to natural village amount and is greater than 120 families and the rural area of common below the power consumption 2800kWh of year per family.This programme is generally applicable to the rural area of plains region, and what other areas met above-mentioned condition also can use this programme.
1) scheme basic composition
This typical scenario is made up of N-B-200, N-B-400, N-B-600 tri-subschemes.Wherein N-B-200 is 3 area schemes, amount 200 family, corresponding village; N-B-400 is 4 area schemes, amount 400 family, corresponding village; N-B-600 is 8 area schemes, amount 600 family, corresponding village.
2) distribution transformer capacity is selected
The load level that distribution transformer capacity presses distant view year (as the year two thousand twenty) is considered, should adopt 200kVA.
3) distribution transformer platform pattern
The height of 10kV route lever can be coordinated in principle, select in 10 meters of-10 meters half fractions of 10-ZA-1-D-01,12 meters of-12 meters half fractions, 15 meters of-15 meters half fractions, 10 meters-10 meters full fractions, four kinds of modes from " State Grid Corporation of China rural power grids 10kV rural power grids 10kV pole type transformer platform General design scheme construction atlas ".
4) distribution transformer platform connecting system
Distribution transformer platform should access 10kV branched line through disconnector, and the circuit between disconnector load side to distribution transformer platform high-pressure side can adopt pole line or cable.Should protect by the requirement zinc oxide surge arresters of relevant code when adopting cable.
5) low-pressure line-outgoing switch and reactive-load compensation
(1) substation transformer low-pressure side is generally by 2 road low-pressure line-outgoing configurations.Time necessary, also can by 3 tunnel outlet configurations.
(2) substation transformer low-pressure side installs the reactive power automatic compensation device of automatic switching.
(3) low-pressure line-outgoing switch and reactive power compensator unification are arranged in JP cabinet.
6) primary cable section selection and low-voltage circuit length
Primary cable cross section goes out No. 2 low-voltage lines consider by the final scale 200kVA of substation transformer, every platform transformer, and backbone selects 70mm
2insulated conductor, branch line select 50mm
2insulated conductor.Low pressure backbone length should be no more than 150 meters, and transformer should be no more than 250 meters to the actual track length of terminal temperature difference.
7) counter box
(1) this programme resident unifies employing 6 epi-position anti-theft meter case, is installed on open air.
Also 2,4 epi-position table casees can be selected from common standard atlas when actually needed.
(2) three-phase power user adopts 1 epi-position anti-theft meter case dispersion to install, but also should be installed on open air.
, N-C Typical Disposition scheme
N-C class rural power grids typical design solution, is applicable to the rural area that natural village amount is less than 120 families.Generally mostly be the rural area that mountain area scale is less, what other areas met above-mentioned condition also can use this programme.
1) scheme basic composition
This typical scenario is made up of N-C-20, N-C-50, N-C-100 tri-subschemes.Wherein N-C-20 is amount 20 family, corresponding village; Corresponding amount 50 family, village of N-C-50; Corresponding amount 100 family, village of N-C-100.
2) distribution transformer capacity is selected
Distribution transformer capacity is considered by distant view year (as the year two thousand twenty), and N-C-20 adopts 50kVA, N-C-50 to adopt 100kVA, N-C-100 to adopt 200kVA.
3) distribution transformer platform pattern
The height of 10kV route lever can be coordinated in principle, select in 10 meters of-10 meters half fractions of 10-ZA-1-D-01,12 meters of-12 meters half fractions, 15 meters of-15 meters half fractions, 10 meters-10 meters full fractions, four kinds of modes from " State Grid Corporation of China rural power grids 10kV rural power grids 10kV pole type transformer platform General design scheme construction atlas ".
4) distribution transformer platform connecting system
Distribution transformer platform should access 10kV branched line through disconnector, and the circuit between disconnector load side to distribution transformer platform high-pressure side can adopt pole line or cable.Should protect by the requirement zinc oxide surge arresters of relevant code when adopting cable.
5) low-pressure line-outgoing switch and reactive-load compensation
(1) substation transformer low-pressure side is generally by 2 road low-pressure line-outgoing configurations.Time necessary, also can by 3 tunnel outlet configurations.
(2) distribution transformer low-pressure side installs the reactive power automatic compensation device of automatic switching.
(3) low-pressure line-outgoing switch and reactive power compensator unification are arranged in JP cabinet.
6) primary cable section selection and low-voltage circuit length
N-C-100 primary cable cross section goes out No. 2 low-voltage lines consider by the final scale 200kVA of substation transformer, every platform transformer, and backbone selects 70mm
2insulated conductor, branch line select 50mm
2insulated conductor;
N-C-20, N-C-50 primary cable cross section is by the final scale 50(100 of substation transformer) kVA, every station power distribution transformer go out No. 2 low-voltage lines and consider, and backbone selects 70mm
2insulated conductor, branch line select 50mm
2insulated conductor.Low-voltage circuit span should be not more than 60 meters in village.
7) counter box
(1) this programme resident adopts 2,4,6 epi-position anti-theft meter casees, is installed on open air.
(2) three-phase power user adopts 1 epi-position anti-theft meter case dispersion to install, but also should be installed on open air.
, N-D Typical Disposition scheme
N-D typical design solution is rural area New Residence electrical network typical design solution, is applicable to the rural area New Residence that resident's amount is less than 600 families.
1) scheme basic composition
This typical scenario is by the box change of N-D-400a(), the box change of N-D-600a(), N-D-400b(platform becomes), N-D-600b(platform becomes) four subschemes form.The wherein box change of N-D-400a(), N-D-400b(platform become) be amount 400 family, corresponding village; The box change of N-D-600a(), N-D-600b(platform become) amount 600 family, corresponding village.
2) distribution transformer capacity is selected
Distribution transformer capacity by distant view year (as the year two thousand twenty) consider, the box change of N-D-400a(), the box change of N-D-600a() adopt 400kVA, 630kVA, N-D-400b(platform become), N-D-600b(platform become) adopt 200kVA, 315kVA.
3) ring main unit pattern
Adopt single bus scheme, inlet wire 1 time, outlet 3 times, power supply voltage transformer (VT) 1 unit.
4) distribution transformer platform pattern, box modification formula
" the full fraction of 2-12 meters-12 meters " formula in " Hebei province's electric power rural power grids standardized designs " is selected to become platform.
Box-type substation 10kV inlet wire: 1 time.
Low-pressure line-outgoing: 400kVA transformer low voltage outlet 6 times, 630kVA transformer low voltage outlet 8 times.
5) box change, becomes platform connecting system
When selecting box change scheme, selecting when box parameter amount is greater than 2 and connecing power supply through ring main unit cable outlet mode by T, when box parameter amount is less than or equal to 2 by T contact directly through cable junction mode; When selecting change platform scheme, by power supply T contact through cable junction mode.
6) low-pressure line-outgoing switch and reactive-load compensation
(1) step down side is generally by 2 ~ 3 road low-pressure line-outgoing configurations.
(2) transformation low-pressure side installs the reactive power automatic compensation device of automatic switching.
(3) low-pressure line-outgoing switch and reactive power compensator unification are arranged in JP cabinet.
(4) box low pressure side reactive-load compensation principle: reactive compensation capacity is configured according to 20% ~ 40% of main transformer capacity.Case becomes Electric capacity compensation device and is arranged in casing.Low voltage power capacitor adopts contactless self healing capacitor, and single condenser capacity should be not more than 20kvar.
7) primary cable section selection and low-voltage circuit length
Low-voltage cable selects crosslinked polyethylene type copper core cable, and main cable chooses four-core 95,70 cross section; Two core 50 cross sections chosen by unit inlet wire cable.
8) counter box
(1) resident adopts 12 epi-position anti-theft meter casees, is installed in corridor.
(2) dispersion of three-phase power user single epi-position anti-theft meter case is installed, but also should be installed on open air.
step 2: the powering mode determining at village level electrical network
1) townhouse residential district powering mode can be taked in the rural area (as plains region) of living for townhouse, the feature of this powering mode is: substation transformer dispersed placement, substation transformer low-voltage side outlet 3 to 4 times, often return the power supply of a responsible row or two row residents, supply load Relatively centralized, radius of electricity supply is little, is applicable to townhouse inhabitation rural area.
2) rural area (as area, mountain area) for inhabitation relative distribution can adopt scattered settlement district powering mode, the principal character of this powering mode is: substation transformer choice arrangement is in the center in scattered settlement district, substation transformer low-voltage side outlet 3 to 4 times, low-pressure line-outgoing is arranged to surrounding radiation centered by substation transformer, for the power supply of the resident of scattered settlement, supply load relative distribution, radius of electricity supply is large.
3) for existing townhouse residential district, there is again the rural area in scattered settlement district, a part of load Relatively centralized simultaneously, also have scatteredload simultaneously, townhouse/scattered settlement district powering mode can be taked in this type of area, and this powering mode can be divided into two kinds of situations according to the size of power supply plan:
(1) for multiple stage district power supply plan, a part (one or more) substation transformer can be arranged near townhouse residential district, for townhouse, resident powers; And another part (one or more) substation transformer is arranged in scattered settlement district center position, low-pressure line-outgoing centered by substation transformer to surrounding radiation, for resident powers.
(2) for separate unit district power supply plan, substation transformer should be arranged near townhouse residential district, and the resident that a substation transformer low-pressure line-outgoing part is responsible for townhouse inhabitation powers, and another part low-pressure line-outgoing is arranged into scattered settlement district, for the resident of scattered settlement powers.
step 3: carry out equipment choice and erection installation
After determining low-voltage network Typical Disposition scheme and powering mode, can select and installation equipment according to following a few partial content.
) 10kV transmission line of electricity
radius of electricity supply:10kV radius of electricity supply is comparatively large in load density, and location, economy more flourishing rural area is no more than 5 kilometers; In load density, less or location, remote mountainous rural area is no more than 15 kilometers.
network structure:10kV network structure is mainly divided into two kinds of modes: single supply radiation type electric supply pattern and dual power supply Single-ring network powering mode; The 10kV circuit entering village adopts single power supply, the emanant mode of connection; When village is larger, the mode of many 10kV circuits difference power supply areas also can be adopted; When rural area periphery possesses many 10kV circuits, 10kV network interconnecting circuit is set according to actual needs, builds as 10kV dual power supply Single-ring network pattern; Described single power supply pattern refers to centered by a power supply point, to the power supply mode of connection of periphery diffusion; Dual power supply Single-ring network powering mode refers to that two power supply points are powered, and is linked together by end to end mode by 10kV electrical network, if ensure certain.
circuit section is selected:according to be with capacity of distribution transform and load prediction situation, 10kV circuit adopts 50mm
2or 70mm
2section steel core aluminum stranded wire or suspended insulated guide wire.By every platform capacity of distribution transform be 200kVA measuring and calculating, wall scroll enters village 50mm
2wire is with distribution transforming quantity should control within 12, wall scroll 70mm
2wire is with distribution transforming quantity should control within 16.
the construction of line requires:when 10kV circuit sets up outside village, wire adopts steel-cored aluminium strand.Straight line rod-type generally adopts 12 meters of prestressed electric wire poles.Non-prestressed electric pole should be adopted on the backroad side of traffic prosperity.Span is preferably 60-80 rice.When 10kV circuit sets up in village, use aerial insulated wire, 12 meters or 15 meters of non-prestressed taper cement poles should be selected.Line span is preferably 50-60 rice, does not generally arrange strain section.When 10kV circuit is consistent with 0.4kV line alignment, prioritizing selection high-low pressure is joint used, and span is not more than 50 meters.
) low voltage distribution transformer
capacity Selection:the final capacity of design of single distribute-electricity transformer district generally comprises 50kVA, 100kVA, 200kVA.According to village prediction load level, platform district and low-pressure line-outgoing should be built according to final capacity.Newly-built or transformation platform district builds according to final capacity 200kVA distribution transforming usually; The remote districts that load density is less, can select 50kVA, 100kVA distribution transforming construction.Load density is comparatively large, the village of individual processing industry prosperity in village, or the district of CCTV in larger village, and 200kVA distribution transforming can be selected to gather point mode construction.
erection requires:substation transformer generally should adopt pole type transformer platform form.S11 type and above energy-saving and environmental protection type Three-Phase Distribution Transformers should be selected, adopt No-load changer mode.Reactive power compensator is configured as requested in JP cabinet, and reserved intelligent terminal installation site.
) 0.4kV grid parts
network structure:switched-mode power supply carried out by 0.4kV power distribution network, adopts radial construction.For optimized network structure and equipment choice, different substation transformer service area does not consider to supply load mutually, and 0.4kV side is not carried out interconnected.0.4kV low-voltage network is solidly grounded system, should adopt TT earthing mode.
radius of electricity supply:low voltage three-phase outlet radius of electricity supply should be no more than 400 meters; Service conductor should be no more than 50 meters, and span should be not more than 25 meters; House lead in should be no more than 50 meters.Distribution transforming and maximum radius of electricity supply, amount that maximum permission is with are recommended to perform by following requirement:
(1), when capacity of distribution transform is 50kVA, radius of electricity supply is not more than 500 meters, be with amount to be not more than 25 families.
(2), when capacity of distribution transform is 100kVA, radius of electricity supply is not more than 400 meters, be with amount to be not more than 50 families.
(3), when capacity of distribution transform is 200kVA, radius of electricity supply is not more than 400 meters, be with amount to be not more than 90 families.
low-pressure line-outgoing:each district's design low-pressure line-outgoing is generally 2 times, and designs final Capacity Selection primary cable model according to platform district.Time necessary, also can adopt 3 times low-pressure line-outgoings.Every road low-pressure line-outgoing goes out 2 to 8 three-phase separate branch lines, should adopt low pressure overhead insulating aluminum conductor.70mm pressed by basic routing line conductor cross-section
2select, 50mm pressed by branched line conductor cross-section
2select.
) service conductor
Service conductor refers to the circuit between low-voltage distributing line (branched line or basic routing line) to measurement meter.
When number of users is 1 ~ 3 family, single-phase service conductor aluminium core insulation conductor cross-section generally selects 16mm
2.
When number of users is 4 ~ 8 family, single-phase service conductor aluminium core insulation conductor cross-section generally selects 25mm
2.
When customer charge is larger, suitably can increase conductor cross-section according to actual conditions, also can adopt and increase wire radical or three phase supply mode.
) service wire
Service wire refers to the circuit between measurement meter to user.Service wire is by customer investment, and user selects voluntarily.This modular design only proposes necessary requirement from security standpoint.
Service wire can adopt copper or aluminum conductor, is consistent in principle with by indoor use electric line material.Its cross section should be selected according to the peak load of user.
) family table and table case
Household should adopt the metering method of " Every household has an ammeter ", generally selects single-phase meter meter, and power user can select three-phase meter meter.Single-phase electric energy meter selects 5(60) A electric energy meter (this is a kind of model of electric energy meter, just and the air-conditioning of 2500W be a meaning.This table Calibrated current is 5A, maximum current 60A.Correct measures range 0.5A to 60A.Wherein minimum value is drawn by 10% of Calibrated current), three-phase electric energy meter selects 5(20) A, 5(30) A electric energy meter.According to customer charge amount, install mutual inductor additional.Suitable aftercurrent action protecting equipment is installed according to different 0.4kV earthing modes.Electric energy meter should be arranged on there is anti-stealing electricity function metering cabinet (case) in, during conditions permit, single household can carried out arranging respectively near user locations.
Low-voltage customer recommendation intelligent meter, there is the abilities such as electric energy metrical, data processing, two-way communication and Function Extension, can realize bidirectional measuring, long-range/local communication, mutual, the multiple electricity price charging of real time data, long-range cut-off electricity, electric energy quality monitoring, with the function such as user interaction.Counter box should have anti-stealing electricity function, there is obvious cut-off point with service conductor, and installation site should close to house lead in point, and lower edge is apart from more than 1.8 meters, ground.Outdoor counter box should select environment-friendly type non-metal case, and in counter box, spatial division answers distinct family power and function to set up separately, facilitates management of power supply and power utilization.
Of the present invention
beneficial effectfor:
The present invention is through a large amount of investigations, the variety of problems that the current at village level electrical network of combing exists, based on this, considered simultaneously resident's Habitation form in rural area, different regions, per capita year power consumption, the many factors such as load density, by the analysis ratio choosing to different allocation plan, finally determine a kind of configuration and building method of at village level electrical network, comprising the Typical Disposition scheme of four kinds of controller switching equipments, three kinds of powering modes and concrete installation requirement, to instruct design and the construction of at village level electrical network.The present invention establishes the technical standard of at village level electrical network distribution on the basis of rule of summing up conventional art experience and at village level electricity consumption, has filled up domestic blank.
social benefit:the present invention is by selecting power-supply unit allocation plan, determining rural power service pattern and erection enforcement three steps, make at village level power grid construction science, specification and efficient more, effectively can improve electric network composition, promote mains supply ability and power supply reliability, help the problem thoroughly solving electrical network last one kilometer power supply capacity deficiency, progressively build up the novel at village level electrical network of " rationally distributed, technology is suitable for, power supply quality is high, electric energy loss low ", better serve rural area prosperity, agricultural development, peasant's affluence, promote rural area socio-economic development.
economic benefit:the present invention implements in 1230 rural areas in the South Hebei Area, newly-builtly transforms into village 10 KV 432 kilometers, 1772, transformer, 0.4 KV 962 kilometers.Through the rural area of transformation, capacity of distribution transform on average improves 0.5 kilovolt-ampere per family, cause enters village 10 KV, low-voltage circuit fault causes tripping operation number of times to reduce by 34% and 46% respectively, and 10 kilovolts and following comprehensive line loss per unit reduction by 1.52%, rural area load and power consumption speedup are obviously accelerated.Calculate by Hebei Electric Power Corporation's rural power grids electricity sales amount in 2013 38200000000 yuan, comprehensive line loss per unit reduces by 1.52% directly will produce economic benefit 5.8 hundred million yuan.Meanwhile, because the optimization of electric network composition and the renewal of equipment make power supply reliability 99.559%, improve 2.059 percentage points and see, integrated voltage qualification rate 99.338%, improve 2.238 percentage points, 95598 complain 3620 times, reduce 13%.The raising of power supply quality reduces the maintenance cost of power grid enterprises and corresponding handling cost, for power grid enterprises create larger profit.
benefit to power grid enterprises produce:the inventive method is conducive to the science decision of rural power grids investment, the at village level electric network composition configuration of specification; Improve at village level power grid construction in the past lack of standardization, the unmatched present situation of lectotype selection; Meanwhile, by solving the problem in close relations with urban residents such as low-voltage, " seizing by the throat ", make resident obtain material benefit, therefore, this research also has the social effect of particular importance.In addition, the present invention yet forms both " at village level electrical network modular design " technical standard one.
Accompanying drawing explanation
Fig. 1 is townhouse residential district powering mode schematic diagram in the configuration of the at village level electrical network of the present invention, implementation method practical embodiments;
Scattered settlement district powering mode schematic diagram in the configuration that Fig. 2 is the at village level electrical network of the present invention, implementation method practical embodiments.
1 transformer in figure, 2 villager's houses.
Embodiment
example and implementation result
In recent years, along with the continuous accelerated development of rural economy, simultaneously by the factor impact such as " household electrical appliances are gone to the countryside " and " coal electricity price difference ", rural electricity consumption load is surge situation, there is overload operation situation in part village power equipment, in addition, New Residence is built in a large number in outer, rural area, and " hollow load " problem also highlights gradually.To this, the technical standard that State Grid Hebei Electric Power Company is formed according to the present invention--" at village level electrical network modular design ", conscientiously plans at village level electrical network target net, uniform technical standards, and science carries out rural area distribution transformation, has effectively cracked power shortage problem.
case study on implementation 1:
County of Handan City is maximum Vegetable produce base, North China, and along with people live raising, the household electrical appliance of urban residents' family get more and more, and almost there have been the household electrical appliance such as electric motor car, air-conditioning, water heater, electromagnetic oven, refrigerator in every household; Simultaneously along with the development of agricultural economy, the need for electricity of peasant also increases than in the past a lot.Some electrical network rural power grids starts to occur the problems such as low, the power supply " seizing by the throat " of peak time quality of voltage.
Utilities Electric Co. of county of Handan City has carried out upgrading to the rural power grids of some outstanding problems in this way, is below transformation process.
the first step, selects the Typical Disposition scheme of power-supply unit.according to the development scale in rural area, this area, the rural area of this area belongs to amount and is greater than 120 families, and electricity is greater than the rural area, Plain of 2800kWh/ per family.Therefore this area's rural power grids have employed N-A Typical Disposition, have employed N-A-200, N-A-400, N-A-600 tri-seed scheme respectively according to the scale in different village.
second step, determines powering mode.this area belongs to plains region, and resident lives Relatively centralized, and the powering mode of rural power grids have employed townhouse residential district powering mode (as shown in Figure 1).
3rd step, equipment choice and erection are installed.
circuit pack:this area belongs to plains region, and 10kV transmission line of electricity radius of electricity supply have selected and is no more than 5 kilometers, and actual power radius is 2-3 km, and 10kV circuit have employed 70mm
2suspended insulated guide wire.
substation transformer part:all select S11 type pole type transformer platform, capacity is 200kVA.
circuit pack:0.4kV power distribution network all carries out switched-mode power supply, have employed radial construction, and radius of electricity supply is less than 400m.Low-pressure line-outgoing is 2 times, and backbone cross section is 70mm
2, a point service main cross section is 50mm
2, service conductor cross section is 25mm
2.The counter box of domestic consumer all adopts single-phase electric energy, and model is 5(60) A; For the user needing triple point, be configured with three-phase electric energy meter, model is 5(30) A electric energy meter.
According to above step, Utilities Electric Co. of county of Handan City has carried out the upgrading of rural power grids to an administrative village, 440 in its compass of competency.Correctional effect is described for a wherein typical village, and according to local farmers reaction, the voltage instability transformed in front village often trips, and does not all start at peak of power consumption air-conditioning, and electric fan also not too turns, and washing machine is shivered with cold, and televisor can be seen reluctantly.According to the statistics of Utilities Electric Co., the capacity of distribution transform per family in transformation Qian Gai village only has 0.65kVA, and line loss per unit is up to 13.1%, and low-voltage problem is serious, and during peak of power consumption, front power supply terminal voltage is minimum only has 180V; Reach 1.15kVA through transforming capacity of distribution transform per family, low-voltage problem obtains and solves thoroughly, simultaneously owing to taking wire insulation, restringing wire diameter, shortening the multinomial measures such as platform district radius of electricity supply, line loss per unit is reduced to 4.2%.Through electric network reconstruction, power supply capacity and power supply reliability are obtained for and improve greatly, provide to urban residents and also bring huge economic benefit to electric company easily simultaneously.
embodiment case 2:
Taihang Mountain, the Yanshan Mountain, Hengshan Mountain San Shan intersection residing for Laiyuan County, Hebei province, whole county most area is positioned at mountain area, hilly country, rural development level backwardness relatively, and urban residents live and very disperse, rural power grids present situation also backwardness relatively.Low-voltage, line loss are large along with the same outlet of a lot of rural power grids of expanding economy, " seizing by the throat " etc. affect the problem of power supply quality.This county electric company has carried out upgrading to this area's rural power grids in this way, and detailed process is as follows:
the first step, selects the Typical Disposition scheme of power-supply unit.according to the development scale in rural area, this area, rural area, this area belongs to the mountainous rural area that amount is less than 120 families, have selected N-C Typical Disposition.
second step, determines powering mode.this ground belongs to area, mountain area, and resident lives relative distribution, and the powering mode of rural power grids have employed scattered settlement district powering mode (as shown in the figure)
3rd step, equipment choice and erection are installed.
circuit pack:this ground belongs to area, mountain area, and the 10kV transmission line of electricity radius of electricity supply in most of rural area is all longer, but all more than 15 kilometers, 10kV circuit have employed 50mm
2suspended insulated guide wire.
substation transformer part:all select S11 type pole type transformer platform, capacity have chosen 200kVA or 100kVA two kinds.Installed to relatively flourishing rural area or small towns the substation transformer that capacity is 200kVA, all having installed capacity to general rural area is 100kVA substation transformer.
circuit pack:0.4kV power distribution network all carries out switched-mode power supply, have employed radial construction, and the radius of low voltage power supply in most of rural area is all less than 400m, and for indivedual rural area, resident lives and disperses very much, fail to meet this requirement, but quality of voltage meets the requirements after measured.Low-pressure line-outgoing is 2 times, and backbone cross section is 70mm
2, a point service main cross section is 50mm
2, service conductor cross section is 25mm
2.The counter box of domestic consumer all adopts single-phase electric energy, and model is 5(60) A; For the user needing triple point, be configured with three-phase electric energy meter, model is 5(30) A electric energy meter.
Correctional effect is analyzed: the present situation transforming electrical network in front village is that wire diameter is thin, radius of electricity supply long, capacity is low per family, and cause voltage problem in village serious, line loss is up to 15.2%; Reach 1.05kVA through transforming capacity of distribution transform per family, rural power grids structure obtains optimization, and within platform district radius of electricity supply has controlled to 500m, low-voltage problem obtains and solves thoroughly, and line loss per unit has been reduced to 5.5%.
Claims (1)
1. the configuration of at village level electrical network, implementation method, is characterized in that: steps of the method are:
step one, select the Typical Disposition scheme of at village level mains supply facility:
When at village level Electric Power Network Planning and construction, consider the Rural Economic Development Levels of different regions, per capita year power consumption situation and these factors of load density, option and installment is carried out to 10kV circuit, substation transformer, 0.4kV line-powered equipment, determines and adapt to the at village level electrical network in different regions to four of the demand of power supply plan kinds of Typical Disposition schemes:
Amount is greater than 120 families, and electricity is greater than rural area, Plain or other applicable village's selection N-A Typical Disposition of 2800kWh/ per family;
Amount is greater than 120 families, and electricity is less than rural area, Plain or other applicable village's selection N-B Typical Disposition of 2800kWh/ per family;
Amount is less than mountainous rural area or other applicable village's selection N-C Typical Disposition at 120 families;
N-D Typical Disposition is selected in New Residence community;
Described N-A, N-B, N-C, N-D Typical Disposition scheme specifically refers to:
(1) N-A Typical Disposition scheme
1) scheme basic composition
This typical scenario is made up of N-A-200, N-A-400, N-A-600 tri-subschemes,
Wherein N-A-200 is 3 area schemes, amount 200 family, corresponding village;
N-A-400 is 6 area schemes, amount 400 family, corresponding village;
N-A-600 is 9 area schemes, amount 600 family, corresponding village;
2) distribution transformer capacity is selected
The load level that distribution transformer capacity presses distant view year is considered, adopts 200kVA; Load density larger area is considered to adopt 315kVA;
3) distribution transformer platform pattern
Coordinate the height of 10kV route lever in principle, select in 10 meters of-10 meters half fractions of 10-ZA-1-D-01,12 meters of-12 meters half fractions, 15 meters of-15 meters half fractions, 10 meters-10 meters full fractions, four kinds of modes from " State Grid Corporation of China rural power grids 10kV rural power grids 10kV pole type transformer platform General design scheme construction atlas ";
4) distribution transformer platform connecting system
Distribution transformer platform is through disconnector access 10kV branched line, and disconnector load side adopts pole line or cable to the circuit become between platform high-pressure side; When adopting cable by the requirement zinc oxide surge arresters protection of relevant code;
5) low-pressure line-outgoing switch and reactive-load compensation
(1) step down side is by 2 road low-pressure line-outgoing configurations; Or by 3 tunnel outlet configurations;
(2) transformation low-pressure side installs the reactive power automatic compensation device of automatic switching;
(3) low-pressure line-outgoing switch and reactive power compensator unification are arranged in JP cabinet;
6) primary cable section selection and low-voltage circuit length
Primary cable cross section goes out No. 2 low-voltage lines consider by the final scale 315kVA of substation transformer, every platform transformer, and backbone selects 70mm
2insulated conductor, branch line select 50mm
2insulated conductor, low pressure backbone length is no more than 150 meters, and transformer is no more than 250 meters to the actual track length of terminal temperature difference;
7) counter box
This programme resident and three-phase power, with adopting single epi-position anti-theft meter case per family, are installed on open air;
(2) N-B Typical Disposition scheme
N-B class rural power grids typical design solution, is applicable to natural village amount and is greater than 120 families and the rural area of average annual below the power consumption 2800kWh in common family; This programme is applicable to the rural area of plains region, and what other areas met above-mentioned condition also can use this programme;
1) scheme basic composition
This typical scenario is made up of N-B-200, N-B-400, N-B-600 tri-subschemes,
Wherein N-B-200 is 3 area schemes, amount 200 family, corresponding village;
N-B-400 is 4 area schemes, amount 400 family, corresponding village;
N-B-600 is 8 area schemes, amount 600 family, corresponding village;
2) distribution transformer capacity is selected
The load level that distribution transformer capacity presses distant view year is considered, adopts 200kVA;
3) distribution transformer platform pattern
Coordinate the height of 10kV route lever, select in 10 meters of-10 meters half fractions of 10-ZA-1-D-01,12 meters of-12 meters half fractions, 15 meters of-15 meters half fractions, 10 meters-10 meters full fractions, four kinds of modes from " State Grid Corporation of China rural power grids 10kV rural power grids 10kV pole type transformer platform General design scheme construction atlas ";
4) distribution transformer platform connecting system
Distribution transformer platform is through disconnector access 10kV branched line, and disconnector load side adopts pole line or cable to the circuit become between platform high-pressure side; By the requirement of relevant code, lightning-protection device is installed when adopting cable;
5) low-pressure line-outgoing switch and reactive-load compensation
(1) step down side is by 2 road low-pressure line-outgoing configurations; Or by 3 tunnel outlet configurations;
(2) step down side installs the reactive power automatic compensation device of automatic switching;
(3) low-pressure line-outgoing switch and reactive power compensator, unification is arranged in JP cabinet,
6) primary cable section selection and low-voltage circuit length
Primary cable cross section goes out No. 2 low-voltage lines consider by the final scale 200kVA of substation transformer, every platform transformer, and backbone selects 70mm
2insulated conductor, branch line select 50mm
2insulated conductor; Low pressure backbone length is no more than 150m, and transformer is no more than 250m to the actual track length of terminal temperature difference;
7) counter box
This programme resident and three-phase power, with adopting single epi-position anti-theft meter case per family, are installed on open air;
(3) N-C Typical Disposition scheme
N-C class rural power grids typical design solution, is applicable to the rural area that natural village amount is less than 120 families;
1) scheme basic composition
This typical scenario is made up of N-C-20, N-C-50, N-C-100 tri-subschemes, and these 3 schemes are 1 area scheme:
Wherein N-C-20 is amount 20 family, corresponding village;
Corresponding amount 50 family, village of N-C-50;
Corresponding amount 100 family, village of N-C-100;
2) distribution transformer capacity is selected
The capacity of substation transformer is pressed the load in distant view year and is considered, N-C-20 scheme adopts 50kVA, N-C-50 scheme to adopt 100kVA, N-C-100 scheme to adopt 200kVA;
3) distribution transformer platform pattern
To coordinate the height of 10kV route lever, select in 10 meters of-10 meters half fractions of 10-ZA-1-D-01,12 meters of-12 meters half fractions, 15 meters of-15 meters half fractions, 10 meters-10 meters full fractions, four kinds of modes from " State Grid Corporation of China rural power grids 10kV rural power grids 10kV pole type transformer platform General design scheme construction atlas ";
4) distribution transformer platform connecting system
Distribution transformer platform is through disconnector access 10kV branched line, and disconnector load side adopts pole line or cable to the circuit become between platform high-pressure side; Should protect by the requirement zinc oxide surge arresters of relevant code when adopting cable;
5) low-pressure line-outgoing switch and reactive-load compensation
(1) step down side is by 2 road low-pressure line-outgoing configurations, or by 3 tunnel outlet configurations;
(2) transformation low-pressure side installs the reactive power automatic compensation device of automatic switching;
(3) low-pressure line-outgoing switch and reactive power compensator unification are arranged in JP cabinet;
6) primary cable section selection and low-voltage circuit length
The final scale 200kVA of substation transformer is pressed in N-C-100 primary cable cross section, and every platform transformer goes out No. 2 low-voltage lines and considers, backbone selects 70mm
2insulated conductor, branch line select 50mm
2insulated conductor;
Substation transformer final scale 50,100kVA are pressed in N-C-20, N-C-50 primary cable cross section, and every platform transformer goes out No. 2 low-voltage lines and considers, backbone selects 70mm
2insulated conductor, branch line select 50mm
2insulated conductor, low-voltage circuit span is not more than 60m in village;
7) counter box
This programme resident and three-phase power, with adopting single epi-position anti-theft meter case per family, are installed on open air;
(4), N-D Typical Disposition scheme
N-D typical design solution is rural area New Residence electrical network typical design solution, is applicable to the rural area New Residence that resident's amount is less than 600 families;
1) scheme basic composition
This typical scenario is made up of N-D-400a, N-D-600a, N-D-400b, N-D-600b tetra-subschemes; Wherein N-D-400a, N-D-400b are amount 400 family, corresponding village; Corresponding amount 600 family, village of N-D-600a, N-D-600b; Above scheme is 1 area scheme; Wherein N-D-400a and N-D-600a scheme adopts box type transformer, N-D-400b and N-D-600b scheme adopts desk-top transformer;
2) distribution transformer capacity is selected
The load that distribution transformer capacity presses distant view is considered, N-D-400a and N-D-600a adopts 400kVA and 630kVA box type transformer respectively, N-D-400b and N-D-600b subscheme adopts the desk-top transformer of 200kVA and 315kVA;
3) ring main unit pattern
Adopt single bus scheme, inlet wire 1 time, outlet 3 times, power supply voltage transformer (VT) 1 unit;
4) distribution transformer platform pattern, box type transformer pattern
Select " the full fraction of 2-12 meters-12 meters " the formula distribution transformer platform in " Hebei province's electric power rural power grids standardized designs ";
Box type transformer 10kV inlet wire is: 1 time;
Low-pressure line-outgoing: the outlet of 400kVA transformer low voltage is 6 times, the outlet of 630kVA transformer low voltage is 8 times;
5) box type transformer, distribution transformer platform connecting system
(1) when box type transformer quantity is greater than 2, power supply to be connect through ring main unit by T contact and draws, and directly to be connect draw when box type transformer quantity is less than or equal to 2 by T contact through cable;
(2) when select become platform scheme time, directly to be connect through cable by T contact and draw;
6) low-pressure line-outgoing switch and reactive-load compensation
(1) step down side is by 2 ~ 3 road low-pressure line-outgoing configurations;
(2) transformation low-pressure side installs the reactive power automatic compensation device of automatic switching;
(3) low-pressure line-outgoing switch and reactive power compensator unification are arranged in JP cabinet;
(4) box low pressure side reactive-load compensation principle: reactive compensation capacity is configured according to 20% ~ 40% of main transformer capacity; Case becomes Electric capacity compensation device and is arranged in casing, and low voltage power capacitor adopts contactless self healing capacitor, and single condenser capacity is not more than 20kvar;
7) primary cable section selection and low-voltage circuit length
Low-voltage cable selects crosslinked polyethylene type copper core cable, and main cable chooses four-core 95,70 cross section; Two core 50 cross sections chosen by unit inlet wire cable;
8) counter box
(1) resident adopts single epi-position anti-theft meter case, is installed in corridor;
(2) three-phase power user adopts single epi-position anti-theft meter case, and dispersion is installed, and is installed on open air;
step 2, determine the powering mode of at village level electrical network
:according to the difference of the Habitation form of different regions urban residents, select townhouse residential district powering mode, scattered settlement district powering mode and townhouse/scattered settlement district powering mode three kinds of powering modes:
1) townhouse residential district powering mode is taked in the rural area of living for townhouse, and the feature of this powering mode is: substation transformer dispersed placement, substation transformer low-voltage side outlet 3 to 4 times, often returns the power supply of a responsible row or two row residents;
2) rural area for inhabitation relative distribution adopts scattered settlement district powering mode, the principal character of this powering mode is: substation transformer choice arrangement is in the center in scattered settlement district, substation transformer low-voltage side outlet 3 to 4 times, low-pressure line-outgoing is arranged to surrounding radiation centered by substation transformer, for the power supply of the resident of scattered settlement, supply load relative distribution;
3) for existing townhouse residential district, have again the rural area in scattered settlement district, a part of load Relatively centralized, also have scatteredload, townhouse/scattered settlement district powering mode is taked in this type of area, and this powering mode is divided into two kinds of situations simultaneously simultaneously:
(1) for multiple stage district power supply plan, by a part be one or more transformer arrangement near townhouse residential district, for townhouse, resident powers; And another part i.e. one or more transformer arrangement is in scattered settlement district center position, low-pressure line-outgoing centered by substation transformer to surrounding radiation, for resident powers;
(2) for separate unit district power supply plan, substation transformer is arranged near townhouse residential district, and the resident that a substation transformer low-pressure line-outgoing part is responsible for townhouse inhabitation powers, and another part low-pressure line-outgoing is arranged into scattered settlement district, for the resident of scattered settlement powers;
step 3:carry out equipment choice and erection installation
After determining low-voltage network Typical Disposition scheme and powering mode, according to following a few partial content, equipment is selected and installation;
1) 10kV transmission line of electricity
radius of electricity supply:10kV transmission line of electricity radius of electricity supply is no more than 5km in location, rural area, Plain; 15km is no more than in location, remote mountainous rural area;
network structure:10kV network structure is mainly divided into two kinds of modes: single supply radiation type electric supply pattern and dual power supply Single-ring network powering mode; The 10kV circuit entering village adopts single power supply, the emanant mode of connection; When village is larger, also adopt the mode of many 10kV circuits difference power supply areas; When rural area periphery possesses many 10kV circuits, 10kV network interconnecting circuit is set according to actual needs, builds as 10kV dual power supply Single-ring network pattern; Described single power supply pattern refers to centered by a power supply point, to the power supply mode of connection of periphery diffusion; Dual power supply Single-ring network powering mode refers to that two power supply points are powered, and is linked together by end to end mode by 10kV electrical network, if when ensureing that certain section of circuit is out of order, in system, all feeder lines can not affect normal operation by another inlet wire power taking;
circuit section is selected:according to be with capacity of distribution transform and load prediction situation, 10kV circuit adopts 50mm
2or 70mm
2section steel core aluminum stranded wire or suspended insulated guide wire; When having penetration, according to actual load, suitably increase cross section capacity; By every platform capacity of distribution transform be 200kVA measuring and calculating, wall scroll enters village 50mm
2wire is with substation transformer quantity to control within 12, wall scroll 70mm
2wire is with substation transformer quantity to control within 16;
the construction of line requires:when 10kV circuit sets up outside village, wire adopts steel-cored aluminium strand; Straight line rod-type adopts 12 meters of prestressed electric wire poles; At the non-prestressed electric pole of the other employing of backroad of traffic prosperity; Span is 60-80 rice; When 10kV circuit sets up in village, use aerial insulated wire, select the non-prestressed taper cement pole of 12m or 15m; Line span is 50-60m, does not arrange strain section; When 10kV circuit is consistent with 0.4kV line alignment, prioritizing selection high-low pressure is joint used, and span is not more than 50m;
2) low voltage distribution transformer
capacity Selection:the final capacity of design that single distribution becomes transformer platform area generally comprises 50kVA, 100kVA, 200kVA; According to village prediction load level, distribution change transformer platform area and low-pressure line-outgoing are according to final capacity setting; Newly-built or transformation distribution becomes transformer platform area and usually builds according to final capacity 200kVA distribution transforming; Remote districts, select 50kVA, 100kVA distribution transforming construction; The village of individual processing industry prosperity in village, or the central distribution transformer platform area in larger village, adopt the mode of multiple stage 200kVA substation transformer centralized arrangement;
erection requires:substation transformer adopts pole type transformer platform form, selects S11 type and above energy-saving and environmental protection type Three-Phase Distribution Transformers, adopts No-load changer mode; Reactive power compensator is configured as requested in JP cabinet, and reserved intelligent terminal installation site;
3) 0.4kV grid parts
network structure:switched-mode power supply carried out by 0.4kV power distribution network, adopts radial construction; For optimized network structure and equipment choice, different substation transformer service area does not consider to supply load mutually, and 0.4kV side is not carried out interconnected; 0.4kV low-voltage network is solidly grounded system, adopts TT earthing mode;
radius of electricity supply:low voltage three-phase outlet radius of electricity supply is no more than 400m; Service conductor is no more than 50m, and span is not more than 25m; House lead in is no more than 50m; Distribution transforming and maximum radius of electricity supply, amount that maximum permission is with perform by following requirement:
(1), when capacity of distribution transform is 50kVA, radius of electricity supply is not more than 500m, be with amount to be not more than 25 families;
(2), when capacity of distribution transform is 50kVA, radius of electricity supply is not more than 500m, be with amount to be not more than 50 families;
(3), when capacity of distribution transform is 50kVA, radius of electricity supply is not more than 500m, be with amount to be not more than 90 families;
low-pressure line-outgoing:each district's design low-pressure line-outgoing is 2 times, and designs final Capacity Selection primary cable model according to platform district; Or with 3 times low-pressure line-outgoings; Every road low-pressure line-outgoing goes out 2 to 8 three-phase separate branch lines, adopts low pressure overhead insulating aluminum conductor; 70mm pressed by basic routing line conductor cross-section
2select, 50mm pressed by branched line conductor cross-section
2select;
4) service conductor
Service conductor refers to the circuit of low-voltage distributing line also namely between branched line or basic routing line to measurement meter;
When number of users is 1 ~ 3 family, single-phase service conductor aluminium core insulation conductor cross-section generally selects 16mm
2;
When number of users is 4 ~ 8 family, single-phase service conductor aluminium core insulation conductor cross-section generally selects 25mm
2;
5) service wire
Service wire refers to the circuit between measurement meter to user; Service wire is by customer investment, and user selects voluntarily;
Service wire adopts copper or aluminum conductor, is consistent with by indoor use electric line material; Its cross section is selected according to the peak load of user;
6) family table and table case
Household adopts the metering method of " Every household has an ammeter ", and generally select single-phase meter meter, power user selects three-phase meter meter; Single-phase electric energy meter selects 5(60) A electric energy meter, three-phase electric energy meter selects 5(20) A, 5(30) A electric energy meter; According to customer charge amount, install mutual inductor additional; According to different 0.4kV earthing modes installing aftercurrent action protecting equipment; Electric energy meter is arranged on to be had in the metering cabinet of anti-stealing electricity function; Carry out single household in close user locations to arrange respectively;
Low-voltage customer recommendation intelligent meter; Counter box has anti-stealing electricity function, there is obvious cut-off point with service conductor, and installation site is close to house lead in point, lower to distance ground more than 1.8m; Outdoor counter box selects environment-friendly type non-metal case, and in counter box, spatial division wants distinct family power and function to set up separately, facilitates management of power supply and power utilization.
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| CN106374463A (en) * | 2016-10-27 | 2017-02-01 | 国家电网公司 | A+ power supply region power distribution network power supply mode configuration method |
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| CN110593951A (en) * | 2019-10-18 | 2019-12-20 | 国网山西省电力公司运城供电公司 | Low-voltage power supply method for tunnel power grid engineering construction |
| CN112491061A (en) * | 2020-11-20 | 2021-03-12 | 国网安徽省电力有限公司黄山供电公司 | Line loss control method for distribution substation under seasonal load |
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Application publication date: 20150715 |