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Successful Implementation ofGIS Techniques forRoute Alignment & Surveys ofPower Transmission Projectsof POWERGRID
Power Grid Corporation Of India Ltd
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To optimize cost of transmission line
Line length, number of locations, deviations Minimum river crossings Minimum forest areas Accessibility, right of way considerations To assess route constraints and do constructionplanning
To ensure statutory clearances
Ground clearance Horizontal/Right of way clearance Clearances from power lines, railway lines, road
crossings etc.
Why Surveying Is Important?
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UHV Transmission LinesUHV Transmission Lines- 765 kV , Requiring Large ROW- 765 kV , Requiring Large ROW
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Long Distance TransmissionLong Distance Transmission
Lines 500 kV HVDCLines 500 kV HVDC
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Transmission LinesTransmission Lines
thru Agricultural fieldsthru Agricultural fields
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Transmission Lines in Hilly areasTransmission Lines in Hilly areas
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Multiple Transmission LinesThrough Same Corridor
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Transmission Line River CrossingsTransmission Line River Crossings
http://192.168.1.18/PN/Gallery/view.asp?img=IMAGES/TOWERS/POWERGRID%20TOWERS/TALCHER-KOLAR/TMP28.JPG&folder=IMAGES/TOWERS/POWERGRID%20TOWERS/TALCHER-KOLAR&si=True&up=IMAGES/TOWERS/POWERGRID%20TOWERShttp://192.168.1.18/PN/Gallery/view.asp?img=IMAGES/TOWERS/POWERGRID%20TOWERS/GENERAL/POWERGRID3.jpg&folder=IMAGES/TOWERS/POWERGRID%20TOWERS/GENERAL&si=True&up=IMAGES/TOWERS/POWERGRID%20TOWERS8/2/2019 ed Latest Modern Survey
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Project Conceptualization / Project FeasibilityStageFaster and accurate techniques required toevaluate various line routes
Pre-Construction StageRoute alignment, Detailed Mapping of right ofway, ground profiling, finalisation of towerlocations with geo technical details
Detailed contouring of undulated terrain forestimation of benching and revetment quantities
Project Construction StageCheck Survey only
Transmission Line Surveying
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Large Quantity variations duringexecution stage avoided Constraints assessed in advance Engineering activities can be taken inadvance Construction work can be taken upimmediately after contract award Reduction in IDC due to reduction in
project execution time
offsetting costof survey using modern techniques Reduction of even 1-2 kms linelength would offset cost of surveyingusing modern techniques
Advantages of Conducting Detailed Survey inAdvance
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Detailed Survey Modern TechniquesDetailed Survey Modern Techniques
Route Alignment using latest satellite imageriesRoute Alignment using latest satellite imageries
(PAN + LISS III Merged products)(PAN + LISS III Merged products)superimposed on Survey of India Topographicalsuperimposed on Survey of India TopographicalMapsMaps
Digital terrain modeling in hilly terrain usingDigital terrain modeling in hilly terrain using
contouring datacontouring data Detailed Survey using GPS, Total stations orDetailed Survey using GPS, Total stations or
alternatively ALTMalternatively ALTM Digitized contouring at undulated / hilly towerDigitized contouring at undulated / hilly tower
locationslocations Identification of Route constraints,Identification of Route constraints, Identification of infrastructure detailsIdentification of infrastructure details
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Detailed Survey Modern TechniquesDetailed Survey Modern Techniques
Tower spotting & optimization of locationsTower spotting & optimization of locations
using commercial software like PLS CADDusing commercial software like PLS CADD
Estimation Of BOQEstimation Of BOQ
Preparation Of Survey reportsPreparation Of Survey reports
Soil InvestigationSoil Investigation
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METHODOLOGY
Acquisition of Remote
Sensing Data
Digitization of Base
details from SOI
sheets
Preparation of Updated
Digitized Maps
Selection ofcorridors/alternatives Route Selection ReconnaissanceSurvey
GPS/Total Station Survey
Digitized Profiling
Computer-aided tower
spotting
BOQ Estimation, Reportsetc.
GeotechnicalInvestigations
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Digitized ToposheetDigitized Toposheet
Survey of India Topo Sheet Corresponding Digitized Map
indicating relevant information
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Digitized Satellite ImageDigitized Satellite Image
Satellite Imagery
(5.8/20 m resolution)
Corresponding Digitized Image
indicating relevant information
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Selection of Alternative RoutesSelection of Alternative Routes
Bee
Line
Existing Line
Alternative
3
Alternative
2
Alternative1
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Computerized Route Optimization by StudyComputerized Route Optimization by Study
of Alternative Routesof Alternative Routes
Bee
Line
Existing Line
Alternative
3
Alternative
2
Alternative1
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Digital Terrain ModelDigital Terrain Model
Computerized Three Dimensional Image
Bee Line Alternative-3Alternative-1
Alternative-2
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Advantages of ModernAdvantages of ModernSurvey Techniques overSurvey Techniques over
Traditional survey MethodTraditional survey Method
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Topographic Sheet Indicates only Nala
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Satellite Image Indicates
Large waterbody
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Topographic Sheet Indicates only a part
of Canal
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Satellite Image IndicatesAnother Branch of Canal
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Topographic Sheet
Not many details
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Satellite Image IndicatesRecent InfrastructureDevelopments, LandslideAreas
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T i i Li S th h GIS
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Transmission Line Survey through GIS
Change of RiverCourse
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Detailed Survey on Selected RouteDetailed Survey on Selected Route
Detailed Survey is done on the selected route using
Total Stations. Plotting of Surveyed Route on the Topographical Maps
Tower Spotting and profiling is done using PLS-CADDSoftware.
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PLS CADD SoftwarePLS CADD Software
Power Line Systems Computer Aided Design and Drafting (PLS CADD) isa software developed by Power line systems Inc. USA.
The software is used for Tower Spotting.
The software automatically provide SAG Clearances.
The software automatically calculates wind & WeightSpan.
The software prepares the Plan & Profile View of theT/L line.
Report Generation.
The overall organization of the PLS CADD software is shown in the
following slide.
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PLS CADD SoftwarePLS CADD Software
3-D Model of-D Model ofLine in Corridorine in Corridor
3-D Terrain3-D Terrain
Survey DataSurvey Data
Feature CodesFeature Codes
Design CriteriaDesign Criteria
LoadsLoads
ClearancesClearances
StructuresStructuresGeometryGeometry
StrengthStrength
CablesCables
All PropertiesAll Properties
ReportsReports
Material ListMaterial List
SpecificationSpecification
Etc.Etc.
DrawingsDrawings
Plan & ProfilePlan & Profile
Exported toExported to
CAD systemCAD system
ArchivingArchiving
LineLine
ManagementManagement
FutureFuture
ModificationsModifications
Corridor TerrainCorridor Terrain
Ground + ObstaclesGround + Obstacles
InstallationInstallation
SpottingSpotting
AutomaticAutomatic
ManualManual
StringingStringing
SaggingSagging
Etc.Etc.
CalculationsCalculations
Sag TensionSag Tension
ClearancesClearances
Struct-StrengthStruct-Strength
SwingsSwings
Etc.Etc.
Librariesibraries
Inputnput Processingrocessing Outpututput
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Plan & Profile DrawingPlan & Profile Drawing
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Key AdvantagesKey Advantages
PLS Cadd software used forPLS Cadd software used forpreparing Plan & Profile Drawingpreparing Plan & Profile Drawingand Report Generationand Report Generation
Eliminates manual error in ReportEliminates manual error in Reportgeneration.generation.
Empowers Managers to move /Empowers Managers to move /
modify structures and see the effectmodify structures and see the effecton the Line.on the Line.Reports / Calculations of modifiedReports / Calculations of modified
structures can be viewed instantly.structures can be viewed instantly.
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Airborne Laser Terrain Mapping(ALTM)
First reflection
(first pulse)
Last reflection
(last pulse)
The laser locator installed onboard
records both returns from the
vegetation cover and objects onthe ground (that is the first pulse)
and from the terrain under the
vegetation (that is the last pulse).
This system together with data
processing software are used to
create digital terrain model notaffected by the vegetation.
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New Line ConstructionNew Line Construction
Knowing exact geometry along the route with as many details desirable as it makesdesign process much more productive. With laser survey much more efficient andfast to collect the information along the route for new power line design andconstruction.
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Evaluation Of ClearancesEvaluation Of Clearances
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Thermal Uprate StudiesThermal Uprate Studies
Thermal uprate study will become much less complicated process with laser
survey data. Three-dimensional information about actual power line geometry and
condition brings all relevant details along the route of the power line.
DETAILED SURVEY USING MODERN TECHNIQUES
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TEESTA-V (Route Alignment using satellite imagery) SRINAGAR-LEH (Route Alignment using satelliteimagery)
PARBATI-II, KOLDAM KAHALGAON
BARH KUDAMKULAM NEYVELI RANCHI-SIPAT RAPP-5&6
MAITHON WR STRENGTHENING PARBATI-III URI-II etc. etc.
DETAILED SURVEY USING MODERN TECHNIQUESFOR PROJECTS
COMPLETED / UNDER IMPLEMENTATION
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Thank You
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