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DL/T 5218-2012: Technical code for the design of 220kV~750kV substation
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 and 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 and insulation coordination, grounding ... 29??
5.6 AC station service ... 29??
5.7 Lighting ... 30??
5.8 Selection and 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 and control system and electrical secondary wiring ... 34??
6.5 DC power system and uninterruptible power supply (UPS) ... 35??
6.6 Arrangement of control room and 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 and 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 and 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 and 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 and 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....