SUBSTATION LAYOUT
SUBSTATION LAYOUT
Design and
Layout diagram
Layout diagram
After bus arrangement is decided,
After bus arrangement is decided,
Key diagr
Key diagram and t
am and then layout dr
hen layout drawing should
awing should be
be
prepar
prepared- to show actual p
ed- to show actual position of each
osition of each
equipment
equipment
Land plan- boundaries of the
Land plan- boundaries of the land acquired
land acquired
Civil works
Civil works
Electrical works
Electrical works
Roads and paths for the movement of men and
Roads and paths for the movement of men and
material
Electrical works
For placing the various equipment in the
switchyard.
The no. of columns and beams to support the
busbars and incoming and outgoing connections
depends upon the system voltage.
It should reveals
Physical position of each equipment
Distance between various equipments
Phase segregation distance
Erection
In electrical layout, overhead wire (for protecting
against lightning strokes) will be marked. O/H wire
decides no. of columns and beams by the structural
engineer.
Steel erection key- determines no. of various structures
to be fabricated and helps the field erectors to erect
the various structures at right positions.
No. of supporting structures (Las,
Pts, CTs, CBs,
Insulators, etc) should be finalized from the drawing
Supporting structures, columns and beams may be of
steel or reinforced cement concrete.
Clearances
Various clearances for different voltages
T o ensure satisfactory performance in service
Safety of personnel in inspection, operation and maintenance work
Electrical clearance
Earth clearance
P
hase clearance (flash over)
Section clearance-safety clearance to conductors (min distance bt
unscreened live wires and work section. When screens are
interposed, the distance is to be taken as a taut string measurement
around the edge of the screen)
Ground clearance- safety clearance to insulators (min distance bt
insulators and work section)
Work section (open type switchgear)
It should be capable of delimitation by screens
or other means of restricting access to live
conductors
Any convenient sub division of a switching
station that include one or more items of
equipment
Busbar material
Bus bar conductor
P
ost type insulators
Suspension insulator strings
Substation Detailed Engineering
Electrical
Protection and Metering SLD
Substation Layout Plan and
Sections
Substation Clearance Diagram
Erection Key Diagram
Earthing & Lightning Protection
Lighting System Design
Cable Routing and Schedule
Control Room Equipment Layout
Battery and LVAC System
SCADA System
Project Bill Of Materials
Civil and Structural
Foundation Design and Engineering Structure Design and Engineering Control Room Building Design and Engineering
Lightning & Lighting Mast
Foundation and Cable Trench Layout Storm Water Drainage System
Road, Drain, Duct Bank
Transformer and Reactor Foundation Transformer Fire Wall and Soak Pit Project Bill Of Materials
Detailed enginnering
System Studies and Reports
Data Collection
Power System studies for network expansion
Techno Economic Feasibility Studies
DetailedProject Reports in WB/ADB format Financial Analysis Year wise Implementation Schedule Project Development Site Selection through Distribution Planning Studies Selection of schemes Layout Configuration Permits and Approvals Project Engineering Basic and Conceptual Engineering Engineering Specifications Preparation of Tender Document Bid Evaluation / Recommendations
Post Contract Engineering /
Review and Approval of Vendor Documents
Detailed Design and Drawings
Project Management Project Scheduling and
Control Progress Monitoring and Co-ordination Inspection and Expediting Site Services
Supervision of Construction and Erection Protection co-ordination and relay setting Testing and Commissioning
Preparation of O & M Manuals As-Built drawings
Quality Control Implementation Measurement and Certification
P
rocedure for drawing
General Drawings
Drawings of electrical plant and machines shall include, where appropriate: a. Overall dimensions;
b. Terminal point details; c. Minimum clearances;
d. Design pressures and temperatures for plant or plant items subject to pressure and temperatures higher than ambient; and
e. Insets, where necessary, to ensure every item of the assembly is clearly shown.
Requirements of Shop Drawings
Detailed shop drawings shall be prepared covering all aspects of the works.
The Designer shall review the shop drawings and any other technical submissions
Electrical Drawings
Electrical drawings for the installation shall be drafted in accordance with AS 1102 and shall include the following:
a. Single Line Diagrams showing:
Bus rating and switchboard characteristics; Current transformer ratios;
Circuit breaker and fuse current ratings; and
Ratings of capacitors, resistors and any other electrical devices. Items shall be designated as per AS 3702;
b. Substation Layout drawing to scale; c. Site Layout drawings to scale;
d. Cable schedules (if required);
e. Overall system diagrams, for communication and control systems showing cable types and system components; and
As-Constructed Drawings
Provide As Constructed drawings that show as a minimum: a. The final locations of cables, pits, cable joints etc;
b. Wiring diagrams for all equipment installed including termination diagrams;
c. General arrangement drawings showing details of all equipment installed; and
d. Any information as required facilitating operation and maintenance of the equipment. e. The As Constructed drawings shall form the basis of the Operations and Maintenance
Manuals.
System Drawings
The designer shall prepare revised system documentation whenever an alteration is preformed to the reticulation system or a new system is installed.
As a minimum the following documentation shall be provided in suitable hard copy and digital format in accordance with the Defence requirements
a. Base HV single line diagram; b. Base HV geographic layouts;
c. Substation/switching station schematics for all effected substations and switching stations;
d. HV switchboards schematics for the main high voltage nodes such as CEPS and ISS, and