DL/T 5056-2024 (DL/T 5056-2007) PDF English
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DL/T 5056-2007: Technical Code of General Plan Design for Substation---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/DLT5056-2007
POWER INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.240.10
P 62
Record No.. J761-2007
Replacing DL/T 5056-1996
Technical Code of General Plan Design for Substation
Issued on: DECEMBER 3, 2007
Implemented on: JUNE 1, 2008
Issued by. National Development and Reform Commission
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative References... 7
3 General Principles... 8
4 General Planning... 9
5 General Plane Layout... 11
6 Vertical Layout... 18
7 Underground Pipeline (trough) Layout... 28
8 Roads... 35
9 Treatment and Afforestation of Outdoor Power Distribution Unit Site... 39
10 Technical and Economic Indicators... 41
Technical Code of General Plan Design for Substation
1 Scope
This Standard stipulates the basic technical requirements of general plan design for
substations.
This Standard is applicable to the general plan design for newly constructed or
expanded substations with the voltage level of 110 kV ~ 750 kV. The general plan
design for substations with the voltage level of above 750 kV, reconstructed
substations and converter stations may also take this as a reference.
2 Normative References
Through the reference in this Standard, clauses in the following documents become
clauses of this Standard. In terms of references with a specific date, all the subsequent
modification orders (excluding the corrected content) or revised editions are not
applicable to this Standard. However, all parties that reach an agreement in
accordance with this Standard are encouraged to explore the possibility of adopting
the latest versions of these documents. In terms of references without a specific date,
the latest versions are applicable to this Standard.
GB 50007 Code for Design of Building Foundation
GB 50016 Code for Fire Protection Design of Buildings
GB 50187 Code for Design of General Layout of Industrial Enterprises
GB 50201 Standard for Flood Control
GB 50229 Code for Design of Fire Protection for Fossil Fuel Power Plants and
Substations
GB 50330 Technical Code for Building Slope Engineering
GBJ 22 Specifications for the Design of Factory and Mine Roads
DL/T 5032 Technical Code of General Plan Transportation Design for Fossil Fuel
Power Plants
3 General Principles
3.0.1 The general plan design for substations must comprehensively implement the
nation’s fundamental construction policies; reflect the nation’s technical and economic
policies; unify and clarify construction standards; guarantee that newly constructed
(expanded) substations are safe, reliable, technologically advanced, affordable and
consistent with the national conditions.
3.0.2 The general plan design for substations must establish an overall viewpoint;
conduct in-depth investigation and survey; rely on technological progress; design
meticulously; continuously summarize experience; energetically and deliberately
promote domestic and foreign advanced technologies; adapt measures to local
conditions and adopt mature new materials, processes and plans; satisfy the
requirements of sustainable development.
3.0.3 The general plan design for substations shall comply with relevant stipulations of
Land Administration Law of the People’s Republic of China; comply with the nation’s
land utilization policies; adapt measures to local conditions; implement land
conservation and reasonable land utilization; enhance land utilization rate; make the
most of wastelands, badlands and sloping lands; refuse to occupy, or, occupy very little
farmlands. Furthermore, the general plan design for substations shall reasonably
utilize landforms, decrease site leveling soil (stone) quantity and demolition of the
existing facilities and constructions (structures); avoid or reduce land acquisition on
behalf of others. Through the techno-economic comparison of multiple plans, optimize
design plans; reduce construction costs; shorten construction periods; create
conditions for civilized construction.
3.0.4 This Standard was formulated in accordance with the principles of GB 50187
Code for Design of General Layout of Industrial Enterprises. Except from the execution
of this Standard, the general plan design for substations constructed under special
natural conditions, such as mountainous areas, earthquake areas, collapsible loess
areas, expansive soil areas, soft soil areas, permafrost areas and salinized soil areas,
shall still comply with the relevant stipulations in the existing national standards and
industry standards.
3.0.5 The general plan design for expanded and reconstructed substations shall
combine the characteristics of the previous general plane layout, vertical plan and
equipment setting, so as to reach coordinative unity of the integrity.
4 General Planning
4.0.1 The general planning for substations shall coordinate with the local town planning,
industrial park planning, natural reserve planning or tourism area planning. Substations
shall not be located in geological disaster-stricken sections, such as landslide, debris
flow, large water-eroded cave and mined-out area. Substations shall not be
constructed over mineral products or cultural relics. Avoid mutual interference with
military, aviation and communication facilities. Off-site traffic shall satisfy the
requirements of the transportation of large-sized equipment. Thoroughly utilize nearby
public facilities in livelihood, culture and education, sanitation, traffic, fire protection
and water supply and drainage, etc.
In terms of substations in special landforms, for example, mountainous areas, the
overall planning shall consider the influence of landforms, stability of mountain massif,
slope excavation, flood and waterlogging. Construction of substations in areas affected
by torrential flood and waterlogging should thoroughly utilize the existing flood control
and waterlogging control facilities in the locality.
4.0.2 The overall planning of urban underground (indoor) substations shall satisfy the
requirements of local urban planning; avoid mutual interference with adjacent
neighbors, enterprises and facilities.
4.0.3 The overall planning of substations shall base on the requirements of process
layout, and the demands for construction, operation, overhauling and ecological
environmental protection; combine site location’s natural conditions; implement overall
planning in accordance with the final scale; combine the short-term and long-term
planning, and focus on the short-term planning. In staged construction, in accordance
with the requirements of load development, implement reasonable planning;
expropriate land by stages or at a time.
The overall planning shall base on the above-mentioned principles, make overall
arrangements of substation areas, water sources, water supply and drainage facilities,
entry roads, flood control and discharge facilities, entry and exit corridors, terminal
tower, external power supply and the influence of ambient environment; implement
reasonable layout.
4.0.4 When there are pollution sources near substations, the overall planning shall
base on the category of pollution sources and the prevailing wind direction throughout
the year to prevent adverse influence on the substations.
4.0.5 Substations shall be equipped with reliable water sources. The quality of drinking
water shall comply with the national standard on drinking water hygiene. Production
waste drainage or raindrops and domestic sewage of the substations shall comply with
national or local standards on emission.
5 General Plane Layout
5.1 General Regulations
5.1.1 The general plane layout for substations shall comply with the final scale in
planning and design. In accordance with the requirements of systematic load
development, the possibility of expansion should not be cut down; the general plane
layout for substations shall be as structured as possible.
5.1.2 The general plane layout for substations shall satisfy the overall planning
requirements; process layout in the substations shall be reasonable. Function division
shall be clarified; traffic shall be convenient; land utilization shall be optimal.
5.1.3 The general plane layout for substations shall centralize the recently constructed
constructions (structures), so as to facilitate staged construction and land conservation.
The civil engineering of urban underground (indoor) substation construction shall be
constructed at a time in accordance with the final scale.
5.1.4 The main production and auxiliary (affiliated) buildings of substations shall be
intensively or jointly arranged. When substations are jointly constructed with convertor
stations, they may be intensively or jointly arranged in front of substation areas in
accordance with the nature of auxiliary (affiliated) buildings and the classification of
functional requirements.
5.1.5 On the premise of taking smooth outlet planning and reasonable process layout
into consideration, substations shall combine the layout of natural landform and reduce
soil (stone) quantity to the minimum. When landform height difference of substation
areas is relatively large, stepped-style layout may be adopted.
When the main production constructions (structures) and equipment structural support
of substations in mountainous areas are close to side slopes, the safe distance from
the constructions (structures) to the slope top and slope toe shall be determined in
accordance with 6.3.4 in this Standard.
5.1.6 Between urban underground (indoor) substations and off-site adjacent buildings,
fire exits shall be reserved. The net width and net height of fire lanes shall satisfy
relevant stipulations in GB 50016 Code for Fire Protection Design of Buildings.
5.1.7 Important constructions (structures), such as main control communication
building (room), indoor power distribution unit building (room), large-scale substation
framework, and large-sized equipment, such as GIS composite apparatus, main
transformer, high-voltage reactor and capacitor, should be set up in sections with
uniform soil texture and reliable soil foundation.
5.1.8 In terms of substations located in expansive soil areas, constructions (structures)
which have rigorous requirements towards deformation should be arranged in sections
5.3.3 Rain valve chamber or foam fire-fighting equipment room should be arranged
near oiled equipment, such as main transformer and electric reactor, etc.
5.3.4 When setting up diesel generator room, the arrangement should avoid noise and
vibration effect on the main control communication building; the arrangement should
be as close to AC and DC power distribution rooms as possible.
5.3.5 Water supply and drainage facilities of substations should be separately arranged.
The minimum clear distance shall satisfy relevant stipulations of the existing national
standards.
5.3.6 Water supply constructions (structures) of substations, such as deep-well
pumping room, domestic fire-fighting pumping room and reservoir, should be
intensively arranged in front of substation area in accordance with the process flow.
5.3.7 Buried domestic sewage treatment units should be arranged nearby on a
secluded side near the main control communication building, or, arranged in the edge
zone in front of substation area.
5.3.8 When substation area adopts strong drainage, rain pumping room should be
arranged in relatively low edge zone in the substation area.
5.4 Walls, Fences and Main Entrances
5.4.1 The type of substation walls shall be comprehensively determined in accordance
with certain factors, such as substation location, urban planning and environmental
requirements.
Substations should adopt tangible walls with the height of not lower than 2.3 m. In filing
areas, the height of walls may be properly reduced. In terms of urban substations, or
substations that have requirements towards the environment of substation area,
grillwork walls or other decorative walls may be adopted.
5.4.2 Walls in the substation area shall base on the principle of land conservation and
security guard, strive to be smooth and flat. Walls in the substation area in complex
landforms or mountainous areas shall be arranged in accordance with the landforms.
5.4.3 Tangible walls in the substation area shall set up expansion joint. The spacing
between expansion joints should not be more than 30 m. In areas where wall height
and geological conditions might change, settlement joints shall be set up.
5.4.4 In accordance with the layout and requirements of electrical equipment, if
necessary, fences may be set up around the equipment.
5.4.5 The main entrance to substations should face main roads in the locality, which
makes it convenient for the connection to entrance roads. The orientation and handling
requirements of main entrances to urban substations shall coordinate with urban
6 Vertical Layout
6.1 General Regulations
6.1.1 The design elevation of substation areas shall be determined in accordance with
substations’ voltage level.
In terms of 220 kV hub substations and above 220 kV voltage level of substations, the
design elevation of substation areas shall be higher than flood water level at the
frequency of 1% (recurrence interval, same below) or the historically highest inland
water level. The design elevation of substation areas of other voltage levels shall be
higher than flood water level at the frequency of 2% or the historically highest inland
water level.
When the design elevation of substation areas cannot satisfy the above-mentioned
requirements, respectively adopt the following three different measures in accordance
with the distinction of different circumstances.
1.When measures are adopted in the elevation of the site, the design elevation
shall be not lower than flood water level or the historically highest inland water
level.
2.When flood control or waterlogging control measures are adopted in the
substation area, the elevation of flood control or waterlogging control measures
shall be 0.5 m higher than the above-mentioned flood water level or the
historically highest inland water level.
3.Adopt reliable measures, so that the main equipment base and indoor ground
elevation of production buildings is not lower than the above-mentioned high-
water level.
In terms of substations along storm-affected areas, such as rivers, lakes and the sea,
the elevation of flood control facilities shall also consider storm height at the frequency
of 2% and 0.5 m of free height.
6.1.2 The design elevation of substation in-station areas should be higher than, or,
partially higher than the off-site natural ground, so as to satisfy the requirements of
water drainage of the substation areas.
6.1.3 The vertical layout of substation areas shall reasonably utilize natural landform.
In accordance with the comprehensive consideration of process requirements, the
general plane layout of substation areas, transportation, rain drainage direction, water
drainage spot, and soil (stone) balance, adapt measures to local conditions to
determine the form of the vertical layout. Reduce the quantity of work in slope land,
site leveling soil (stone) quantity, retaining walls and slope protection to the minimum.
Site water drainage route shall be short and smooth.
1.Generally speaking, the vertical layout of substation areas shall consider
minimum site leveling soil (stone) quantity on the premise of comprehensive
balance of in-station and off-site soil (stone) digging and filling (including
entrance roads, base soil, and flood control and drainage facilities, etc.).
2.In terms of vertical layout of substations in mountainous areas and hilly areas,
on the premise of satisfying the process requirements, reasonably utilize the
landform; properly adopt stepped-style layout; try to avoid deep excavation and
high filling; guarantee the stability of side slopes.
6.1.4 In terms of substations located in expansive soil areas, the vertical design should
maintain the natural landform; avoid excessive excavation and filling. In terms of
substations located in mountain-front slope zones in collapsible loess areas,
substation areas should be planned along the natural contour lines; the thickness of
filling should not be excessive large.
6.1.5 The vertical layout of expanded and reconstructed substations shall coordinate
with the previous vertical layout of the substation area; thoroughly utilize the previous
water drainage facilities.
6.2 Determination of Design elevation
6.2.1 Indoor ground of substation buildings shall be comprehensively determined in
accordance with certain factors, such as the form of vertical layout of substation area,
process requirements, site water drainage and soil texture conditions.
1.Indoor ground of buildings shall be not lower than 0.3 m of outdoor ground.
2.In collapsible loess areas, the indoor ground of multi-story buildings shall be
0.45 m higher than the outdoor ground.
6.2.2 The comprehensive gradient in site design shall be comprehensively determined
in accordance with certain factors, such as natural landform, process setting (mainly,
the form of outdoor power distribution units), soil texture conditions, water drainage
mode and road longitudinal slopes, and shall preferable be 0.5% ~ 2%. When there
are reliable water drainage measures, the comprehensive gradient may be less than
0.5%, but, more than 0.3%. The partial maximum gradient should not be more than
6%, If necessary, there should be erosion prevention measures.
The site design gradient of outdoor power distribution units which are parallel to the
direction of the bus should not be more than 1%.
6.2.3 The determination of elevation of in-station and off-site road connection points
shall make it convenient for vehicle passage and water drainage. The pavement
elevation of entry and exit of the substation areas should be higher than the elevation
of off-site pavement. Otherwise, there shall be measures that prevent rains from
flowing into the substation.
6.3.8 The allowable value of slope rate of the following side slopes shall be determined
through the analysis and calculation of stability.
1.Slope height exceeds the range of side slope listed in Table 6.3.6-1 and Table
6.3.6-2.
2.Side slope with relatively soft soil.
3.There is side slope with relatively large load near the edges of slope top.
4.Rocky side slope with relatively developed underground water, or with
extraverted weak structural surface.
5.Side slope with adverse geological conditions.
6.3.9 When the surface layer of side slope manifests sediment wetland, outflow or
outcrop of underground water, in accordance with the practical situation, set up
corresponding water diversion and drainage measures.
6.4 Water Drainage of Site
6.4.1 Water drainage of site shall comply with the landform of substation area, regional
rainfall capacity, classification of soil texture, and vertical and road layout of substation
area. The mode of water drainage shall be reasonable selected. Natural ground
dispersive seepage drainage, rainwater ditch, underground drainage ditch (pipe) or
mixed water drainage mode should be adopted.
6.4.2 Water drainage of outdoor power distribution unit site shall be smooth. In terms
of rainwater intercepted by cable trenches and patrol inspection paths which are higher
than the ground level, water drainage aqueduct should be adopted, or, gutter inlet
should be set up, and rainwater sewer should be laid for water drainage.
6.4.3 When rainwater open ditch is adopted for water drainage, the water drainage
ditch should be set up along the roads; minimize the crossing of ditches. When
crossing is indispensable, orthogonal crossing should be preferred; in oblique crossing,
the crossing angle shall not be less than 45. Open ditch should receive surface
protection treatment. The fracture surface and the form of open ditch shall be
determined in accordance with hydraulic calculation. The depth of open ditch’s starting
point shall not be less than 0.2 m. The longitudinal slope of open ditch shall be
consistent with the longitudinal slope of roads; and should not be less than 0.3%. The
longitudinal slope of open ditch in collapsible loess areas shall not be less than 0.5%.
When the longitudinal slope of open ditch is relatively large, hydraulic drop or rapid
flow trough shall be set up; the location of the hydraulic drop and rapid flow trough
should not be at the turning of open ditch.
6.4.4 When rainwater sewer drainage system is adopted, rainwater inlet shall be
located in sections of water catchment. The form, quantity and layout of rainwater inlets
are no conditions for self-flowing discharge, rainwater pumping room shall be set up
and strong water drainage shall be adopted.
6.5 Soil (stone) Engineering
6.5.1 Soil (stone) quantity in substation areas should reach a basic balance of the total
quantity of excavation and filling. Its content shall include. soil (stone) quantity of site
leveling, construction (structure) foundation, underground facility foundation trench
residual soil, in-station and off-site roads, and flood control and discharge facilities.
When entry road is relatively long, give priority to its own soil (stone) balance. Try to
avoid or reduce secondary re-shipment of earthwork.
When due to conditional restrictions, soil (stone) quantity in substation area cannot
reach a balance, reasonable spoil or earth sampling site shall be selected. In addition,
the possibility of returning soil to farmland shall also be taken into consideration.
In terms of substations in mountainous areas and hilly areas, when earthwork and
stonework emerge, respectively enumerate them; list out the proportion of soil and
stone.
6.5.2 Surface soil leveling treatment of substation area shall comply with the following
requirements.
1.When surface soil of substation area is farming oil or silt, and the content of
organic matters is more than 5%, excavation must be conducted before
backfilling. This layer of surface soil should be intensively piled up and covered
on the soil surface of substation area for the purpose of afforestation or
reclamation of soil to make farmlands; it may be included as soil (stone) quantity.
2.When the surface oil in the filling area has favorable soil texture, and the content
of organic matters is less than 5%, conduct rolling compaction (tamping) of the
surface soil, then, conduct backfilling.
6.5.3 The quality of site leveling filling shall comply with the requirements of relevant
specifications. The filling shall be stratified and rolling-compacted; the thickness of
stratification shall be around 300 mm; the site leveling compaction coefficient shall be
not less than 0.94.
In terms of collapsible loess areas, within 6 m around the buildings, site shall be leveled.
When it is filling, stratification and tamping (or compaction) shall be conducted. The
compaction coefficient shall not be less than 0.95.When it is excavation, in self-weight
collapsible loess site, after surface tamping (or compaction), gray soil surface with the
thickness of 150 mm ~ 300 mm should be set up; the compaction coefficient shall not
be less than 0.95.
6.5.4 Within site leveling range of substation area, when retaining wall also serves as
7 Underground Pipeline (trough) Layout
7.1 General Regulations
7.1.1 The layout of underground pipelines (troughs) shall comply with the overall
planning of the final scale of substation. Pipelines (troughs), construction (structure)
foundations and roads shall mutually coordinate with each other horizontally and
vertically. Combine the short-term and long-term planning; conduct reasonable
planning, so as to make it convenient for expansion.
The layout of underground pipelines (troughs) shall comply with the following
requirements.
1.Satisfy process requirements; process shall be short and prompt, so as to make
it convenient for construction and overhauling.
2.On the premise of satisfying the process and usage requirements, try to
implement shallow embedment. Try to maintain consistency with the vertical
gradient and slope direction of substation area; avoid adverse slope.
3.When underground pipelines (troughs) have any breakdown, construction
(structure) foundation shall not be impaired. Sewage shall not contaminate
drinking water or permeate into other troughs.
4.Trough shall have water drainage and anti-small animal measures.
7.1.2 Underground pipelines (troughs) should be parallelly arranged along the roads
and constructions (structures). Generally speaking, it should be arranged beyond the
road traffic part. Main pipelines (troughs) shall be arranged on the side of road with
more users or more branch grooves; or, pipelines (troughs) shall be classified and
arranged on both sides of roads.
The layout of underground pipelines (troughs) shall be in short route, properly
centralized, and in reasonable spacing. Crossings shall be reduced. When
underground pipelines (troughs) cross, they should be in vertical crossing.
7.1.3 The layout of underground pipelines has two forms, namely, direct embedment
and trough laying. The forms shall be determined in accordance with certain factors,
such as process requirements, geological conditions, pipe characteristics and layout
of underground constructions (structures).
Under the condition of satisfying safe operation and making it convenient for
overhauling, the same type of pipelines, or pipelines of different purposes but without
any mutual influence, may adopt the form of same-trough layout.
7.1.4 When there are conflicts during the layout of underground pipelines (troughs),
horizontal water drainage gradient. The vertical water drainage gradient should
not be less than 0.5%, when it is difficult to implement this, the gradient should
not be less than 0.3%. The horizontal water drainage gradient is generally 1.5%
~ 2 %; in sites that are advantageous to water drainage and the lowest point in
the channels, set up catchment pit and water drainage outlet pipe. The
elevation of the bottom of the catchment pit shall be 200 mm ~ 300 mm higher
than the elevation of the water drainage outlet of water drainage well.
3.Underground channels (tunnels) should adopt self-flowing water drainage.
When the elevation of the bottom surface of the catchment pit is lower than the
elevation of the sewer pipe surface, mechanical water drainage may be
adopted.
4.Underground channels (tunnels) should be arranged above the underground
water level. When the elevation of channel (tunnel) bottom is lower than the
underground water level, there shall be waterproof measures. In addition, the
requirement of anti-floating shall be satisfied.
5.Underground channels...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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