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DL/T 5218-2012 PDF in English


DL/T 5218-2012 (DL/T5218-2012, DLT 5218-2012, DLT5218-2012)
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DL/T 5218-2012: PDF in English (DLT 5218-2012)

DL/T 5218-2012
POWER INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.240
P 62
Registration number: J1459-2012
P DL/T 5218-2012
Replacing DL/T 5218-2005
Technical code for the design of
220kV ~ 750kV substation
ISSUED ON: AUGUST 23, 2012
IMPLEMENTED ON: DECEMBER 01, 2012
Issued by: National Energy Administration
Table of Contents
Foreword ... 7 
1 General provisions ... 9 
2 Terms ... 10 
3 Selection of the substation location ... 12 
4 General plan & layout of the substation ... 14 
4.1 Plan of the substation ... 14 
4.2 General layout ... 14 
4.3 Vertical arrangement ... 18 
4.4 Trench layout ... 20 
4.5 Road ... 21 
4.6 Site treatment ... 22 
4.7 Fence and gate ... 22 
5 Primary electrical ... 24 
5.1 Electrical circuit connection ... 24 
5.2 Main transformer ... 26 
5.3 Electrical installation ... 27 
5.4 Reactive power compensation ... 29 
5.5 Overvoltage protection & insulation coordination, grounding ... 29 
5.6 AC station service ... 29 
5.7 Lighting ... 30 
5.8 Selection & laying of the cable ... 30 
5.9 Auxiliary facilities ... 31 
6 System and secondary electrical ... 32 
6.1 Relaying protection and automatic device ... 32 
6.2 Dispatch automation ... 32 
6.3 Communication ... 33 
6.4 Monitoring & control system and electrical secondary wiring ... 34 
6.5 DC power system and uninterruptible power supply (UPS) ... 35 
6.6 Arrangement of control room & relay room ... 35 
6.7 Safety video monitoring system ... 36 
7 Civil works ... 37 
7.1 General requirement ... 37 
7.2 Loads ... 37 
7.3 Buildings ... 40 
7.4 Structures ... 41 
8 Heating, ventilation and air conditioning ... 45 
8.1 Heating ... 45 
8.2 Ventilation ... 45 
8.3 Air conditioning ... 46 
9 Water supply and drainage ... 47 
10 Fire protection ... 48 
10.1 General requirement ... 48 
10.2 Firefighting facilities ... 48 
10.3 Fire detection and fire alarm ... 49 
11 Environmental protection ... 50 
11.1 General requirement ... 50 
11.2 Control of electromagnetic radiation ... 50 
11.3 Control of noise ... 50 
11.4 Treatment of waste water ... 51 
11.5 Water-soil conservation and ecological environment protection ... 51 
12 Labor safety and occupational health ... 53 
12.1 General requirement ... 53 
12.2 Labor safety ... 53 
12.3 Occupational health ... 54 
13 Energy saving ... 56 
13.1 General requirement ... 56 
13.2 Electrical energy saving ... 56 
13.3 Building and thermal energy saving ... 56 
13.4 Heating, ventilation and air condition energy saving ... 57 
13.5 Water saving ... 58 
Explanations of wording in this standard ... 59 
List of quoted standards ... 60 
Technical code for the design of
220kV ~ 750kV substation
1 General provisions
1.0.1 In order to meet the needs of national and industry standardization
construction, reach a unified standard technical principle for design of
substation, allow the design of substation to meet the relevant national policies,
laws, regulations, reach the requirements of safety and reliability, advanced and
applicability, energy saving and environmentally friendly, it hereby develops this
standard.
1.0.2 This standard is applicable to the design of the newly built, reconstructed,
extended work of substation (switchyard) which has an AC voltage of 220kV ~
750kV.
1.0.3 Substation design shall be combined with engineering features, actively
and deliberately adopt new technologies, new device, new materials, new
processes with application conditions.
1.0.4 In addition to the implementation of this standard, the design of substation
shall also comply with the relevant national standards.
2 Terms
2.0.1
Substation
Part of the power system, which is concentrated in a defined location,
including terminals, switches and control device, buildings and transformers
for power transmission or distribution. It usually includes the facilities (such
as protective devices) required for the safety and control of power system.
2.0.2
Uninterruptible power supply
The power supply which consists of a battery pack, an inverter, other circuits,
that provides AC power when the power grid is out of power.
2.0.3
Substation automation system
A computer application system that implements functions such as
information collection, processing, monitoring, control, operation
management of substation based on computer, network, communication
technologies.
2.0.4
Unattended operation mode
An operation management mode, in which the operation monitoring of the
substation and the main control operation are carried out by the remote
control end, the device of the substation is regularly patrolled and maintained.
There are no on-duty personnel in the substation for fixed operation and
maintenance.
2.0.5
Relay room
A place where the relay protection, automatic devices, transmitters, energy
accumulation and recording instruments, auxiliary relay screens, etc., are
installed.
2.0.6
Time synchronization system
3 Selection of the substation location
3.0.1 The site selection of the substation shall be based on the network
structure, load distribution, urban-rural planning, land acquisition & demolition
and the following provisions of the power system planning and design. It shall
use technical and economic comparison and economic benefit analysis to
select the optimal solution of site location.
3.0.2 When selecting the substation's location, pay attention to saving land and
using the land reasonably. Try to use wasteland and inferior land, do not occupy
or occupy less cultivated land or land of high economic benefits, minimize the
earthwork or stonework.
3.0.3 The selection of substation's location shall conform to the approved
prospective development plan of the power system in the region, meet the
requirements for cable laying, reserve the laying channel of overhead and cable
lines, avoid or reduce the crossover of overhead lines. The location of the
terminal tower of overhead line should be arranged uniformly when planning
the substation's location.
3.0.4 The selection of substation's location shall be based on transportation
conditions and substation's construction needs, facilitating the connection of
incoming roads and large-piece transportation. It shall use the technical and
economic comparison to implement the large-piece transportation plans.
3.0.5 The substation's location shall have suitable geological and topographical
conditions. It shall avoid unfavorable geological structures such as landslides,
debris flows, subsidence zones, earthquake-fracture zones. It should avoid
submerged caves, goafs, exposed and concealed river ponds, shore scouring
areas, areas prone to rolling stones, try to avoid or reduce damage to forests
and natural landscapes.
3.0.6 The substation's location shall avoid the natural areas and cultural relics
that are mainly protected, do not cover the mineral resources. Otherwise, it shall
obtain the written consent of the relevant departments.
3.0.7 The selection of substation's location shall meet the requirements of flood
control and prevention. Otherwise, it shall take flood control and prevention
measures.
3.0.8 There shall be a reliable source of water for production and domestic use
near the substation's location. When groundwater is used as a water source, it
shall carry out hydrogeological surveys or explorations, submit report.
3.0.9 There shall be reliable power supply around the substation's location
which meet the requirements of substation construction and external power
4 General plan & layout of the substation
4.1 Plan of the substation
4.1.1 The general plan of the substation shall be coordinated with the local
urban planning or industrial zone planning. It should make full use of the nearby
public facilities such as traffic, water supply and drainage, flood control.
4.1.2 The layout of substations shall, based on the needs of process technology,
operation, construction and expansion, combined with the needs of life and the
natural conditions of the site, be planned according to the final scale, combining
short-term and long-term, focusing on short-term. It should requisite land in
phases according to the building needs. Production areas, access roads, cable
incoming & outgoing corridors, location of terminal towers, location of water
sources, water supply and drainage facilities, flood discharge and flood control
facilities shall be arranged in a unified and rational manner.
4.1.3 For the substation in flood control and seismic fortification areas, it shall,
based on such factors as geology and topography, arrange the main production
constructions (structures) in relatively favorable areas.
4.1.4 The positioning of substation's location shall rationally use geological and
topographical conditions. For the high and steep slope, it shall analyze its
stability and the impact on the building and structures, take safety measures to
prevent human and animal from falling.
4.1.5 The site of substation should adopt a flat slope layout. When the terrain
has a large height difference, it may use a step arrangement.
4.2 General layout
4.2.1 The combination of plane and space of substation buildings shall,
according to the process requirements, make full use of natural terrain, to
ensure that the layout is compact and reasonable and the expansion is
convenient.
4.2.2 The layout of the supporting and auxiliary buildings of the substation shall
be uniformly planned according to the process requirements and use functions.
It should, combining with the engineering conditions, use the combined building
and multi-floor building, to improve the efficiency of use of the site and save
land.
4.2.3 The type selection of power distribution device shall be adapted to local
conditions. When the technical and economic indicators are reasonable, it
2. It the adjacent exterior walls of the two buildings are non-combustible and have
neither door & window openings, nor exposed inflammable eaves, the fire
separation distance may be reduced by 25% according to this Table.
3. If two buildings are adjacent to each other and the higher exterior wall is a firewall,
the fire separation distance is not restricted. But the clearance between the doors
and windows of the two buildings shall not be less than 5m.
4. When installing electrical devices such as oil-immersed transformers and
reactors, collective or combustible medium capacitors within 5m outside the wall
of production building and structure, within the range of this wall below the
horizontal line 3m above the total height of device as well as 3m at both sides of
the device contour, there shall be no door, window, or opening. When the exterior
wall of the building is 5m ~ 10m from the outer contour of the device, the exterior
wall within the above range may be provided with grade-A fire doors. It may be
provided with fireproof window above the height of device, the fire endurance
limit shall be not less than 0.9h.
5. The distance between the outdoor power distribution device and other buildings
and structures is, unless otherwise specified, calculated by the structure. When
the relay room is arranged in the outdoor power distribution field, the spacing is
determined by the process.
6. The distance between the outdoor power distribution device and the roadside
should not be less than 1.5m, or not be less than 1m under difficult conditions.
7. Where there is no firewall between the outdoor oil-immersed transformer, oil-
immersed reactor and collective capacitor, the net fire-proof distance shall not be
less than the following values: 5m for 35kV; 6m for 66kV; 8m for 110kV; 10m for
220kV and above.
8. The minimum spacing as not specified in the Table is indicated by "-", which can
be determined according to the needs of process layout. The distance between
the fence and the production buildings of category C, D, E or the living buildings
in the substation may be limited if it meets the requirements of fire protection.
9. For the oil-free device, it does not consider spacing.
4.3 Vertical arrangement
4.3.1 The vertical design of the substation shall be carried out simultaneously
with the general layout, meanwhile shall be coordinated with the elevations of
the existing and planned roads, drainage systems, surrounding sites outside
the substation. It should use the flat-slope type or step type. The design
elevation of the substation area shall be determined according to the voltage
level of the substation.
4.3.7 The drainage of the site shall be reasonably selected based on the terrain
of the substation area, the rainfall of the site, the nature of the site soil, the
vertical arrangement and road layout of the substation area. It should use the
natural ground slope for drainage and seepage, open ditch of rainwater,
concealed ditch, concealed tube, or mixed drainage method.
4.3.8 The vertical arrangement of the expanded and reconstructed substation
shall be coordinated with the vertical arrangement of the original substation
area and make full use of the original drainage facilities.
4.4 Trench layout
4.4.1 The layout of pipes and trenches shall be planned together with the final
scale of the substation. The pipes and trenches shall be coordinated with each
other and with building and structures in the plane and vertical arrangement,
the short-term shall be combined with the long-term. It shall be reasonably
arranged to facilitate expansion.
4.4.2 The layout of pipe and trench shall meet the following requirements:
1. Meet the process requirements, the pipe and trench path are short, easy
to construct and maintain.
2. Under the premise of meeting the requirements of process and use, it shall
be buried as shallow as possible, try to be consistent with the sloping
direction of vertical design of the substation area, to avoid reverse slope.
3. When the pipe or trench fails, it shall not endanger the safety of the
building and structures and cause pollution of drinking water sources and
the environment.
4. Pipe and trench design shall take measures against chemical corrosion
and mechanical damage, as well as anti-freeze measures in cold and
freezing districts.
4.4.3 It shall, based on the factors such as process requirements, geological
conditions, pipe material characteristics, medium in the pipe, layout of buildings
and structures within the site, to determine the laying method of pipeline: direct
burial, trenching, overhead, etc.
4.4.4 Under the conditions of meeting the safe operation and facilitating
maintenance, the pipelines of the same type or the pipelines of different uses
but having no mutual impact may be laid in the same trench.
4.4.5 Underground pipelines shall not be arranged within the range of impact
by the foundation pressure of the building or structure.
than 7.0m. For the road section for motor vehicles and flatbed vehicles, the
turning radius shall be determined according to the technical performance of
the motor vehicles and flatbed vehicles. The longitudinal slope of the road in
the substation should not be greater than 6%. In case of stepped layout, it
should be not more than 8%.
4.5.7 The pavement of road within the substation should be cement concrete
pavement. Where it has construction conditions and maintenance conditions, it
may also use asphalt concrete pavement.
4.5.8 The width of the road in the substation is determined according to the
following principles:
1. Trunk road from substation's gate to main control communication building
and main transformer:
1) It may be widened to 4.5 m for the 220kV substation;
2) It may be widened to 5.5 m for the 330kV and above substation.
2. The trunk loop road in the substation shall meet the fire protection
requirements; the pavement width is generally 4m.
3. The width of the maintenance road within the outdoor power distribution
device as well as the road between the 500kV and above substations
should be 3.0m.
4. The width of the pavement of small patrol path in the substation should be
0.6m ~ 1.0m. The width of the pavement of sidewalk connecting to the
building should be 1.5m ~ 2.0m.
4.6 Site treatment
4.6.1 In the outdoor power distribution device area, it should set the operation
floor according to the process requirements.
4.6.2 The substation site may adopt such treatment measures as gravel, pebble
pavement or lime soil closure, or it may be properly greened.
4.7 Fence and gate
4.7.1 The fence of the substation area should be a solid wall which has a height
of 2.2m ~ 2.8m. Where there are noise control requirements, the height of fence
of substation may be determined as needed.
4.7.2 The gate of the substation should use lightweight iron doors or electric
5 Primary electrical
5.1 Electrical circuit connection
5.1.1 The electrical circuit connection of the substation shall be determined
according to the status of the substation in the power system, the planned
capacity of the substation, the nature of the load, the total number of
components as connected to the line and transformer, the characteristics of the
device, etc. It shall meet the requirements of reliable power supply, flexible
operation, convenient operation and maintenance, investment savings, ease of
transition or expansion.
5.1.2 For the final wiring mode of 500kV and 750kV power distribution device,
when the total number of connecting components of the circuit and transformer
is 6 circuits and above, meanwhile the substation has an important position in
the system, it should use one and a half circuit-breaker for wiring. When it
requires fragmented operation due to system's power flow control or limiting
short-circuit current, it may segment the busbar.
When using one and a half circuit-breakers for wiring, it should pair the power
supply circuit with the load circuit into a string. The circuits of same name should
not be configured in the same string, but they can be connected to the busbar
at the same side. When there are more than two transformers, two of them are
in connected in the string, whilst the other transformers may not be connected
in the string but directly connected to the busbar through the circuit-breaker.
5.1.3 330kV power distribution device may be connected by the use of one and
a half circuit-breaker or double busbars. When it requires fragmented operation
due to system's power flow control or limiting short-circuit current, it may
segment the busbar.
5.1.4 When the total number of final connecting components of 330kV ~ 750kV
power distribution device is not more than 6, and the substation is a terminal
substation, under the premise of meeting the operation requirements, it may
use the wiring methods such as line transformer group, bridge type, single
busbar or 2 circuit-breakers in the line, "transformer busbar group" where the
transformer is directly connected to the busbar.
5.1.5 For the 220kV or 110kV power distribution device in 330kV ~ 750kV
substation, it may use the double busbar wiring method. When the technology
is economical and reasonable, it may also be connected by the use of one and
a half circuit-breaker. When using the double busbar wiring and the total number
of components such as transformer as connected to the outgoing line is 10 ~
14 circuits, it may install the segmented circuit-breaker on the same busbar;
to the final wiring.
For the power distribution devices of all levels of voltages which use the gas-
insulated metal-enclosed combination electric device, after economic and
technical demonstrations, it may use the wiring type with a small number of
circuit-breakers.
5.1.10 It should not install a circuit-breaker for the shunt reactor circuit of 330kV
~ 750kV line. It may be based on the operation mode of the shunt reactor as
parallelly connected to the line to determine whether to install the isolation
switch.
5.1.11 When the reactive power compensation device at the low-voltage side
of the 330kV ~ 750kV substation is a shunt capacitor or reactor, it may use a
single busbar. No connection is made between the busbars at the low-voltage
side of each transformer.
5.1.12 The transformer in the conventional power distribution device which uses
the connection method of one and a half circuit-breaker is set according to the
following principles:
1. Under the conditions of meeting the relay protection and measurement
requirements, each string should be equipped with 3 groups of current
transformers.
2. On the three phases of each circuit of outgoing line, it shall be equipped
with the voltage transformers. On the main transformer and each group of
busbars, it shall, according to the requirements of the relay protection,
metering, automatic device, install the voltage transformers on one or
three phases.
5.2 Main transformer
5.2.1 The selection of the main transformer capacity and the number of sets
(groups) shall be determined according to the approved power system planning
and design. When any transformer in the same voltage network of the
substation is in an accident, the other components shall not exceed the
requirements for accident overload. For substations with 2 sets (groups) and
above main transformers, after 1 set (group) stops operation due to accident,
the capacity of the remaining main transformers shall be such that the
substation is not overloaded when the full load is 70%. Meanwhile, within the
allowable time after taking into account of the overload capacity, it shall ensure
the primary and secondary loads of the user. If the substation has other power
sources to ensure the user's primary load after the transformer is out of service,
it may install one set (group) of main transformer.
5.3.2 The design of high-voltage power distribution device shall, based on the
load nature, environmental conditions, operation-maintenance requirements of
the substation, give priority to the equipment and layout plan which saves
resources and land.
5.3.3 The design of high-voltage power distribution device shall, based on the
characteristics, scale, development plan of the project, achieve the principle of
combining long-term and short-term and focusing on short-term.
5.3.4 The selection principle of the power distribution device is as follows:
1. In the 220kV substation, the power distribution device of 35kV and below
should be arranged indoor, the power distribution device of 66kV should
adopt the outdoor open medium-sized layout.
2. The power distribution device of the voltage levels 110kV and 220kV
should choose the outdoor open split-phase middle open-phase split
phase medium-sized, ordinary medium-sized, half-height layout.
3. The power distribution device of the voltage levels 330kV ~ 750kV should
use the outdoor open medium-sized layout.
4. For areas with seismic fortification intensity of 8 degrees and above, it
should not use the open supporting hard busbar power distribution device.
5. For the power distribution device of the voltage levels 66kV ~ 750kV, in
such conditions as serious air pollution, site restrictions, high seismic
fortification intensity, high-altitude environment conditions, through
technical and economic demonstration, it may use the gas-insulated
metal-enclosed collective electrical device.
6. In areas with severe atmospheric pollution (such as coastal areas,
industrial pollution areas, etc.), the power distribution device can be
arranged indoors.
7. Substations in urban area should adopt gas-insulated metal-enclosed
collective electrical device. According to planning and environmental
requirements, it may use the outdoor, indoor, underground power
distribution devices.
5.3.5 The conductor selection design in the power distribution device shall
comply with the provisions of the power industry standard "Design technical
regulations for selecting conductor and electrical equipment" DL/T 5222.
requirements of the current national standard "Code for design of low voltage
electrical installations" GB 50054 and the power industry standard "Technical
code for designing AC station service of 220kV ~ 500kV substation" DL/T 5155.
5.6.2 Switchgear and 220kV substations shall be equipped with two mutual
standby working transformers for station service. The 330kV ~ 750kV
substation shall be equipped with two working transformers and one standby
transformer for station service. The standby transformer for station service is
powered by external reliably power supply.
The capacity of each station service transformer is selected based on the load
as calculated for total station.
When there is only one main transformer, in addition to the use of high-voltage
power supply in the station, there shall also be an external reliable power supply.
5.7 Lighting
5.7.1 The design of substation's electrical lighting shall comply with the
requirements of the current national standards "Standard for lighting design of
buildings" GB 50034 and the power industry standard "Lighting technical code
for designing fossil fuel power plants and substations" DL/T 5390 DL/T 5390.
5.7.2 The safety of lighting device shall comply with the requirements of the
current national standard "National safety technical code for electric equipment"
GB 19517. The safety distance between the luminaire and the high-voltage live
component shall meet the requirements of the power industry standard "Code
of safety operation in power engineering construction (Part of substation)" DL
5009.3.
5.7.3 For the lighting device as installed on a structure which has lightning rod
or lightning protection line, the power line shall take measures to prevent
lightning overvoltage conduction.
5.8 Selection & laying of the cable
5.8.1 The design of cable selection and laying of substation shall comply with
the requirements of the current national standard "Code for design of cables of
electric engineering" GB 50217. The design of cable's fire blocking shall also
comply with the requirements of the current national standard "Code for design
of fire protection for fossil fuel power plants and substations" GB 50229 and
"Code of design on building fire protection and prevention" GB 50016. The fire
blocking materials shall comply with the requirements of the current national
standard "Firestop material" GB 23864.
6 System and secondary electrical
6.1 Relaying protection and automatic device
6.1.1 Substation shall, according to the safe operation needs of the power
system, be equipped with the following protective device:
1. According to the voltage level, the line protection of outgoing configuration,
auxiliary protection, fault recording device;
2. Configure the busbar protection according to the voltage level and busbar
connection type;
3. Follow the requirements of the power industry standard "Guide on security
and stability for power system" DL 755 to install the safety automatic
control devices;
4. Main transformer protection;
5. Reactive device protection, protection of station service transformer.
6.1.2 The design of substation's relay protection and safety automatic devices
shall comply with the requirements of current national standard "Technical code
for relaying protection and security automatic equipment" GB 14285.
6.2 Dispatch automation
6.2.1 The substation shall, according to the safe operation and monitoring
needs of the power system dispatch, be equipped with the following dispatch
automation device:
1. Telecontrol communication device;
2. Electric energy metering device;
3. Synchronous phasor measurement device;
4. Dispatch data network access device;
5. Secondary system's safety protection device;
6. Power quality harmonic monitoring device.
6.2.2 The design of substation's dispatching automation shall comply with the
provisions of the power industry standard "Specifications for the design of
6.4 Monitoring & control system and electrical secondary
wiring
6.4.1 The 220kV ~ 750kV substation shall use computer monitoring.
6.4.2 The design of the substation's computer monitoring system shall meet the
requirements of the power industry standard "Technical code for designing
computerized monitoring and control system of 220 ~ 500kV substations" DL/T
5149.
The computer monitoring system shall be able to realize reliable, reasonable
complete monitoring, measurement, control of th......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.