System Strengthening Scheme for IPPs in Chhattisgarh &...

GEOREFERENCED DGPS

MAPPING 765kV S/C

TRANSMISSION LINE

PROJECT

T & D Business Headquarters : G - 55, MIDC, Butibori, Nagpur- 441 108 Maharashtra, India. Phone : + 91 - 7104 - 265761 - 63, Fax : + 91 - 7104 -265765

Email: [email protected] Webmail : www. transrailltd.com CIN : 174999MH1922P1C000997

System Strengthening Scheme for IPPs in Chhattisgarh & Other Generation Projects in Western

Region

Chhattisgarh-WR Transmission Ltd.

Detailed DGPS Survey Report

System Strengthening Scheme for IPPs in Chhattisgarh & other

Doc No. FC_CD-11100000-CWRTL-DOC-001, Rev.0

Page : 2

Table of Contents

1. Project Details ................................................................................................................ 4

1.1 Introduction............................................................................................................ 4

1.2 Project Scope ........................................................................................................ 5

1.3 Location of the Project .......................................................................................... 6

1.4 Methodology / Philosophy of Route Selection ...................................................... 7

1.5 Route survey techniques: ...................................................................................... 8

1.6 DGPS Survey ...................................................................................................... 12

1.7 Legal Frame Work ............................................................................................... 14

2. Environmental Assessment ........................................................................................ 15

2.1 Forest involvement / Clearance .......................................................................... 15

3. Project Cost .................................................................................................................. 16

4. Approvals and Clearances .......................................................................................... 16

ANNEXURES –

I. DIST. JANJGIR CHAMPA - Digitized Village Maps showing DGPS Coordinates & Statement of forest land





Page : 3





Page : 4

1. PROJECT DETAILS

1.1 Introduction

In accordance with the Electricity Act, 2003, Regional Power Committees (RPC) have

been constituted by the Central Government for the specified Region(s) for facilitating

the Integrated operation of the power system in the Region and to facilitate inter-

state/inter-regional transfer of power and to facilitate all functions of planning relating

to inter-state/ intrastate transmission system with CTU/STU.

As per the 36th Standing Committee meeting, it was decided to strengthen the power

evacuation system from Vindhyachal, Sasan Generating stations and Chhattisgarh

region following scheme are required. As part of the above reinforcement

requirement of the transmission network the following transmission elements got

evolved as “System Strengthening Scheme for IPPs in Chhattisgarh and other

Generation projects in Western Region”.

1. Vindhyachal-IV & V STPP – Vindhyachal Pool 400 kV D/c (Quad) 2nd line.

2. 2 nos. 400 kV Line bays at Vindhyachal – V STPP switchyard

3. 765 kV S/c (2nd) line from Sasan UMPP to Vindhyachal Pool substation

(PGCIL).

4. 1 no. of 765 kV line bay at Sasan UMPP of M/s SPL. Reliance.

5. LILO of one circuit of Aurangabad (PGCIL) – Padghe (PGCIL) 765 kV D/c line at

Pune.

6. Raigarh (Kotra) - Champa (Pool) 765 kV 2ndS/c line.

7. Champa (Pool) – Dharamjaigarh 765 kV 2ndS/c line.

8. Gwalior 765/400 kV – Morena 400 kV D/C line

9. Establishment of 2X315 MVA, 400/ 220 kV substation

Further, the empowered committee in its 32nd meeting decided that the above

system shall be put into competitive bidding.

The Government of India, Ministry of Power, vide Gazette Notification dated July 08,

2014 has notified PFC Consulting Limited to be the Bid Process Coordinator (BPC)

for the purpose of selection of Bidder as Transmission Service Provider (TSP) to





Page : 5

establish Transmission System for “System Strengthening Scheme for IPPs in

Chhattisgarh and other Generation projects in Western Region” through tariff based

competitive bidding process.

M/s ATL became successful bidder and acquired the Special Purpose Vehicle (SPV)

“Raipur-Rajnandgaon-Worora Transmission Ltd”.

1.2 Project Scope The scope of this project will include:

Sl.No.

Transmission System for “System Strengthening for IPPs in Chhattisgarh and

other Generation Projects in Western Region”

Name of the Transmission Element

1 400 kV Interconnection at Gwalior 765/ 400 kV S/S

i) Gwalior 765/400 kV – Morena 400 kV D/C

ii) Establishment of 2 X 315 MVA, 400/ 220 kV substation at Morena

400 kV

- Line bays – 2 nos.

- ICT – 2 x 315 MVA, 400/ 220 kV

- ICT bays – 2 nos.

- Bus reactor: 1X125 MVAR

- Space for 400 kV bays – 4 nos.

220 kV

- Line bays – 4 nos.

- ICT bays – 2 nos.

Space for 220 kV bays – 4 nos

2. Additional evacuation line from Vindhyachal-IV & V STPP (3x500 MW)

i). Vindhyachal-IV & V STPP – Vindhyachal Pool 400 kV D/C (Quad) 2nd line

ii) 2 Nos. 400 kV Line bays at Vindhyachal - V STPP switchyard

3. Additional System Strengthening Scheme for Chhattisgarh IPPs (Part-A)

i) Sasan UMPP – Vindhyachal Pooling station 765 kV S/C line

ii) 1 no. of 765 kV line bay at Sasan UMPP of M/s SPL, Reliance

iii) LILO of one circuit of Aurangabad – Padghe 765 kV D/C line at Pune

iv) Raigarh (Kotra) - Champa (Pool) 765 kV 2nd S/C line

v) Champa (pool) – Dharamjaigarh 765 kV 2nd S/C line





Page : 6

1.3 Location of the Project

Major element of this projects is in Madhya Pradesh state(60 % of total Project

scope) and rest of elements are in Chhattisgarh State (35% of total project scope)

and Maharashtra State (5% of total project scope).

S.No. Description Tentative Line Length (Km)

State involved

1 400 kV D/C Gwalior - Morena Line 49 Madhya Pradesh

2 400 /220 kV, 2X315 MVA Morena substation

- Madhya Pradesh

3 400kV D/C Vindhyachal-IV & V STPP-Vindhyachal pool Line

28 Madhya Pradesh

4 2 Nos 400 kV Line bays at Vindhyachal - Madhya Pradesh

5 765 kV S/C Sasan UMPP-Vindhyachal pooling station

6 Madhya Pradesh

6 765kV Line bay at Sasan UMPP of M/s SPL, Reliance

- Madhya Pradesh

7 LILO of One circuit of Aurangabad-Padghe 765 kV D/C Line at Pune

64 Maharashtra

8 765 kV S/C line Raigarh – Champa (Pool)

94 Chhattisgarh

9 765 kV S/C line Champa (Pool)-Dharamjaigarh

49 Chhattisgarh





Page : 7

1.4 Methodology / Philosophy of Route Selection

In order to execute such magnitude of transmission system, selection of the line route

is a very important criteria, however while deciding the route all the guidelines, rules,

acts, etc. of the state as well as central has been taken in to account.

As transmission lines have to traverse from generating stations to load centers and

beneficiary states, the topographical & geographical nature of the terrains play

significant influence in the implementation of project as well as the project cost.

Hence, it is essential that at the planning stage itself various alternative routes and

technical solutions for transmission lines be examined in detail.

Presently, conventional methods of survey like walk over survey, preliminary survey

and detailed survey are carried out at various stages from conceptualization of the

project to implementation. There are new means available which are used to conduct

route survey using Google, DGPS based survey etc.





Page : 8

Following are the major factors taken into account while deciding the line route

of the project as per the provisions of the acts and rules –

a. Major habitation & settlement area avoided.

b. Wild Life Sanctuary’s , Biosphere’s, Dense forest avoided.

c. Minimum vegetation / tree cutting in the line route

d. Minimum no of River Crossings , Railway Crossings, Highway Crossings,

Power Line Crossings are considered.

e. Lowest minimum forest area demand in the proposed route

f. Archeological structures, defense sites, airport area, etc are avoided.

g. Accessibility of approach road to the project site.

h. Rich gardens, plantations, notified industrial area, etc to be avoided.

i. Economic viability of the route

1.5 Route survey techniques:

Preliminary & Route Alignment Survey

Preliminary Survey included the following steps:

Map study

Walkover survey

Map Study

After drawing various routes of alignment network within the Topo maps, a

comparative study was made on the basis of the following data:

Route length.

Nos. and type of important road points in each indicating alignment of each

road as measured on the map.

Nature and number of major crossings.

Mapping the industrial installations, structures, and important places for

identification of Roads.

Approach to the line in general for construction & maintenance.

Reaches through protected or Reserved Forests

Continuously long stretches in paddy fields.

Close parallelism with Railway lines.





Page : 9

Walkover Survey was carried out going over the area associated with the routes and

collecting features observed other than those existing on the map. In addition the

indications on following features are also checked:

Communication lines

Accessibility and smoother approach.

Logistics of the route.

Existing and Present course of River

Power lines (existing)

Expanding villages and towns

Rich gardens and plantations

Reserved forests and high tree areas, National Parks & Wild life sanctuaries

Archeological monuments, Aerodromes, radar centers etc.

Steep sloping terrain, Areas prone to land slides, soil instability etc.

Prohibited areas declared under statutory regulations

Remote Sensing:

Remote Sensing is modern technique in mapping sciences. It is now a major tool to

map any area on earth’s surface for transmission of power. The planning for

installation of large transmission towers needs proper planning. For this, updated

base maps are required. Remote sensing imageries can help in updating the

available topographic maps. The recently launched satellites like IKONOS, IRS-1C,

1D (PAN) having its very good spatial resolution of 1mt and 5.8mts through digital

image processing techniques; it is able to identify even small features with the

resolution as given above.

To select site for putting new transmission towers and lines especially in hilly terrains,

the density of trees, elevation differences has to be carefully studied in detail. In such

cases, remote sensing is the main technology, plays a vital role for the preparation of

database on landforms, land use / land cover and related database. Integrating these

information in GIS platform, it is able to generate three dimensional terrain model

(DTMs) of the area, which can be further updated with the multi dated satellite

images and aerial photographs also Digital Photogrammetry is the potential

technology to provide the information’s on terrain elevation which has to be studied

before locating site for transmission towers and lines. This has found great success





Page : 10

in many European countries but yet to be implemented in the developing countries

like India.

Satellite Image (Google Map):

Satellite Images were used as most authoritative document to record latest

topographical changes along the surveyed routes. This involved the initiations of the

following activities.

Transferring of images to studios for processing and detailed measurements.

Ground Verification was undertaken to study the authenticity of the images. Camera is supposed to see topographic details vividly, that is the only reason, why

satellite images are used in detailed survey in comparison to the traditional field work.

The ground profile in digital form could be obtained from satellite images, which in

turn enable the user to estimate various types earthwork involved like benching,

revetments etc. could be computed by using the relevant software.

Appropriate techniques for obtaining soil conditions, depth of ground water, terrain

conditions etc. for correct estimation of civil works could be explored.

Due to “Shadow Effect”, some errors crop up in the satellite imageries, which affect

the preliminary surveys, and it becomes difficult to differentiate between the forests

and other greenery, consequently it becomes difficult to mark the forest boundaries

etc.

Proper resolution plays an important role in interpreting satellite images; higher

resolution improves the quality of visual Context and may differentiate the ground

realities closely.

Relief data and subsoil data cannot be assessed from Satellite imageries.

Digitization of Complete Zonal maps, rather selected features would provide a

complete replica in integrated environment.

Satellite data of resolution 1 – 5.8m will be preferable. How ever, the overall cost

economy shall have to be worked out, as this data will be more costly, but will

avoid field assignment in many places.

Symbols of physical features in satellite imageries are not easily recognized by

transmission line engineers.





Page : 11

Three (3) alternate route alignments were carried out by help of satellite images

available in google map. Physical walk over survey was conducted on all the three

routes and DGPS / GPS coordinates were collected at every 100 meters along with

soil strata.

Based on the information so collected, the best route was selected after evaluation of

factors like, minimum forest coverage, angle points, river crossing, power line

crossing, habitation etc.

The Infrastructural details along the routes between Champa (pool) –

Dharamjaigarh 765 kV 2nd S/C line are as follows:

Name of Proposed Transmission line between

: 765 kV S/C line between Champa and Dharamjaigarh

District : Janjgir champa and Korba

Total No. Angle Points : 38

Total Route Length : 49.033 kms

Terminal points :

Champa substation:

Latitude 21°58 '3.747"

Longitude 82°29 '23.497"

Dharamjaigarh substation:

Latitude 22°16 '4.109"

Longitude 82°45 '33.622"

Major Crossings along the route :

Total H.T. Line : Total - 17 nos. 132 kV -3 nos, 220 kV -3 nos, 400 kV -5

nos., 765 kV -5 nos, 800 kV HVDC-1 no.

Total Railway Line : 2 nos.

National Highway (NH) : 1 no. (NH-200)

State Highway (SH) : Nil

River Crossing

: Major River : 1 no. Mand River -523 mtr

: Minor River: Nil





Page : 12

Name of Proposed Transmission line between

: 765 kV S/C line between Champa and Dharamjaigarh

Forest /Sanctuary : ~24 Ha Forest Land involvement. No sanctuary / ESZ.

Towns, Cities & villages along the route

: The route alignment is avoiding towns/inhabitants.

Minerals in the route corridor : Nil

Type of Crops Forest Land, Hill are along the route

:

a) Crops Paddy , Rahar, Lentil, Soyabin, Gram, and etc.

b)Soil Clayeyey silt of low of plastisity for details of the soil investigation please refer Annexure-8.

c) land Plan (90%)

d) Hill 10%

Land Involvement : Combination of barren and agriculture

Climate :

a) Seasons

Summer= March to June, Monsoon= July to October, Winter= November to February

b) Maximum Temperature

49°C

c) Minimum Temperature

8°C

Specific feature :

This alternative route-1 having comparatively less route length(49.033 kms), well connected by road network which makes it convenient for construction and maintenance of T/L. Hence, this alternative route is feasible & economical and being considered for execution.

1.6 DGPS Survey

DGPS is a satellite based system developed and maintained by US Department of

Defence. In this system 28 satellites are orbiting round the globe in six different planes

which gives the coordinates of any point on the globe. The technology gives high

accuracy coordinates when observed in differential GPS mode. In the survey,

differential GPS technology was used for maintaining the overall control and accuracy

of the survey exercise. DGPS control stations were established in the proposed area

for one hundred and twenty minute of observation time for each angle point. The

observed data was post processed to get the final DGPS survey results in UTM map

projection system with 44 North zone parameters and WGS84 datum.





Page : 13

Following methodology was adopted for the work. The accuracy of the DGPS

instruments used was 5mm +/-1ppm in static mode, which is sufficient for the said

project.

Preliminary study and Data preparation work :

Locations of the DGPS Pillars fixed by the client were first studied.

Location for camping of the team and their mobilization schedule was planned

and the major town and accessibility from the town to the remotest rover

location was assessed.

Study of the existing available village maps, mine lease map and SOI

toposheet.

Simultaneously the team was mobilized to site, so that they will have the feel of the

project, feel of the site conditions, and they were also made aware of the purpose /

importance of the project.

Planning of the Activities :

Planning of the work is the most important activity in DGPS survey. In this exercise

satellite data of the location to be surveyed was collected for fifteen minutes of

observation, to collect the ephemeris data. The Planning activity defines the working

schedule of the GPS observation. The ephemeris data was processed to know the

availability of the satellite data for the working days. The time with good availability of

satellites with minimum PDOP are selected for the work. The stages include

First the ephemeris data was downloaded of the area of interest.

All the activities were planned based on the best availabilities of the satellite

vehicle and minimum PDOP value.

Identification of the Base and Reference:

After the reconnaissance survey and planning, next task was to identify and establish

the main reference point for the survey work. For the Elevations, reference considered

was from a Bench Mark inside the mine area as given by client. For horizontal

reference the DGPS Survey in UTM/WGS 84 for the base data was used. The EPOCH

was set at 15 sec and the data was collected in UTM/WGS84 projection system with





Page : 14

44N zone parameters. The elevation mask for the observation was kept as 13˚ with

reference to the Horizon. Following is the list of the Base stations established in the

area of interest.

The DGPS observations were carried out on all the angle point / entry & exit point of

the proposed route through forest. The rover locations were established by the client.

In all GCPs were fixed on site. The data for each GCP was recorded in the DGPS

Detail Form and digital photographs were taken for future reference.

The data from the DGPS was down loaded on day today basis through Trimble Data

Transfer software. This data was then processed in Trimble Geomatic Office software

to resolve the ambiguity using the UTM Standard 44 North zone parameters. The Base

lines were processed to get the required accuracy.

1.7 Legal Frame Work

It is proposed to execute the above entire transmission system as per provisions

contained in the Indian Electricity Act 2003 and the rules made there under and the

Electricity (Supply) Act 1910 and 1948.





Page : 15

2. ENVIRONMENTAL ASSESSMENT

2.1 Forest involvement / Clearance As per the practice, preliminary route selection is done based on such documents as

the Forest Atlas and the survey of India maps using “bee” line method followed by

field clarification through walk over survey. All possible steps are taken to avoid the

route alignment through forest. In case where it becomes unavoidable due to the

geography of terrain, the alignment is made in such a way that the route through the

forest is the barest minimum.

2.1.1 For selection of optimum routes following points are taken into consideration:

i. The route of the transmission line does not involve any human rehabilitation.

ii. Any monument of culture or historical importance is not getting affected.

iii. The route does not create any threat to the survival of any community with

special reference to tribal.

iv. It does not affect any Public Utility Services like Play Ground, School, etc.

v. It does not pass through any Wildlife Sanctuaries, Nation Park, etc.

vi. It does not infringe with areas of natural resources.

vii. 15 kms. away from major towns to account for future urban expansion

In case where it becomes unavoidable due to the geography of terrain, the alignment

is made in such a way that the bare minimum line route through forest is selected.

Name of Transmission line Forest – Involvement (Approx. Length in kM)

765 kV S/C line between Champa - Dharamjaigarh

~3.82





Page : 16

3. PROJECT COST

The total project cost including taxes and duties works out to INR 105 crores for Transmission

line project from Raipur to Rajnandgaon to Wardha (Maharashtrra).

4. APPROVALS AND CLEARANCES

Following approvals and clearances need to be obtained from the various authorities

at the different stages of the project. Close follow up will be exercised for the timely

approval of the below items.

Sr No Statutory Clearances Concerned Authority

1 Approval Under section 68 of E.A 2003 MoP

2 Transmission License CERC

3 Tariff Adoption CERC

4 Forest Approval MoEF

5 Aviation AAI

6 PTCC clearance CEA

7 Power Line Crossing Concern Utility

8 Railway Crossing Railway Authority

9 National Highway Crossing NHAI

11 Final Charging Clearance approval CEA





Page : 17

ANNEXURE – I DIST. JANJGIR CHAMPA GEOREFERENCE MAPS





Page : 18





Page : 19





Page : 20





Page : 21





Page : 22





Page : 23





Page : 24





Page : 25

System Strengthening Scheme for IPPs in Chhattisgarh &...

Documents

Transcript of System Strengthening Scheme for IPPs in Chhattisgarh &...