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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
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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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