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Sept.3-5, 2013, China AORC-E-8-0003 CIGRE-AORC 2013

GIS-based model for implementation on Power Transformer planning within Thailand Power Network

N. Parkpoom

Electricity Generating Authority of Thailand53 Moo 2 Charansanitwong Rd., Bang Kruai Nonthaburi 11130 Thailand.

Tel: +66 2 436 3541, E-mail: suchao.p@egat.co.th, jake_suchao@hotmail.com

SUMMARYThis paper present the conceptual design model of GIS-based on power transformer

planning power network in Thailand have been mapped using GIS and it application. The

processing capabilities of GIS and the system ability to manipulate geo-reference data and

results in different formats and models make them suitable for planning and operation of

distribution system. The distribution system load flow based on GIS presented in the paper

is an ideal tool for performing the analysis and viewing the result on map superimposed on

other geographic layers. It is allow power system planners to work on the real system by

relating the output to the location of load and feeder. Together with the utilisation of power

systems will become an essential tool for utility decision maker and the public. In addition, it

could be incorporated in optimal planning power transformer distribution network.

KEYWORDS: GIS-based model, Power Transformer Planning, Distribution Network,

Thailand.

I. INTRODUCTIONEGAT is the largest power producer in Thailand, owning and operating power plants

of different types and sizes which are located in 39 sites across Thailand. EGAT also owns

and operates high voltage transmission networks, which covers all parts of the country.

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From last decades, the electric power industries have been developing power transmission

system to follow up with rapid growth of the power demand. The power electricity is an

essential part of our everyday lives. The electric distribution system is dedicated to delivering

electrical energy to the end use. In Thailand, the main drawbacks of the distribution system

are poor update power transformers maintenance of the installed facilities, lack of planned

network. Today electric distribution are realised the manual updating of planned network

construction operation, and lack of monitoring and prevent losses and manual updated

of consumer records etc. Present the electric distribution are realising the benefits of

Geographic Information System (GIS) on designed for electric utilities that manages the

distribution system which deliver the electric power to out service drops, by providing a

geographically oriented view of electric distribution structures. GIS is a computer-based

platform capable of handling spatial data that represent real world feature transmission lines,

in the form of digital maps and attributed geo-relational database. GIS-based model allow

new processing methods to be used and provides high-quality presentation of processed

data and decision making tool in situations when data relevant to a decision include a spatial

component. Operates the national transmission network, which includes transmission lines

and substations of various high voltage levels which covers all parts of Thailand. Power

generated at generation plants and sent to a network of high-voltage (500, 230 or 150 kV)

transmissionlines. These transmission lines supply power to mediumvoltage (e.g. 23 or

22kV) distribution networks (distributionprimary system), which supply power to still lower

voltage. Figure 1 show Thailand Generation Transmission and Distribution Power System.

Figure 1: Show Thailand Generation Transmission and Distribution Power System.

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II Why GIS-based model on Power Transformer planningToday’s electric utilities are realising the bnefits of GIS technology in the area of

automated mapping [1]. GIS has become a very significant tool for electrical utilities for

activities like utility asset management, maintenance planning, outage management and

network planning. Especially in the area of distribution planning, GIS can provide the utilities

planning team a visual insight of areas which may experience higher growth rates of electrical

demand, the Right of way (Row) availability for the utility, and the load concentration details

in the service region. Customer information like the phase information, sanctioned load and

connected load is also being maintained in GIS in addition to the utility asset information

like transformers, overhead conductors, cables and protective devices. These details, when

maintained as accurate and up-to date as possible in GIS will help in providing necessary

information for building an electrical network model required for in-house electrical network

analysis and planning for ensuring the growth and reliability of the network[1,2].

Figure 3 Inputs for GIS model on Power Electrical planning network model

GIS-base model for a practical Power Transformer network on electrical utilities require

keeping a comprehensive and accurate inventory of their physical assets, for the provision

of extending the network, undertaking maintenance, etc. Complexity of electrical distribution

power system is only a reason for introducing new technologies as GIS and GPS (Global

positioning system) that carries out complex power system analyses e.g. optimization of

networks, load forecasting in very less time period as and when required. GIS technology

has the facility to plan an electrical transformer and distribution network which sometimes

very difficult to access for surveying like remote hilly areas. GIS based software also have

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the facility to interface it with other software tools. The power transformer system is important

to an electrical utility because its proximity to the ultimate customer and its high investment

cost. The transformer and distribution system planning is necessary to fulfill the growing

demand of electricity in an optimum way to make the techno-economic feasibility of the

transformer and distribution system expansion. The planning of electrical power transformer

and distribution networks is a continuous development process for the customer point of

view, increase in load demand and in Research & Development. Earlier it was done manually

on road maps now among modern technologies; GIS can be helpful to solve the problems [3].

GIS based model has become a necessity for a host of power transformer and

distribution which is dedicated to delivering electric distribution system. Thailand was focus of

distribution.sector as this sector affects the consumers. The GIS application is designed for

electric utilities that manages the distribution system which deliver the electric power to out

service drops, by providing a geographically oriented view of electric distribution structures.

This application helps utility managers and administrators visualize, analyze and understand

real-world engineering, business and customer problems and more importantly solutions.

Power transformer network application provides a powerful new tool for utility solutions.

The goal of this system is to provide operational efficiencies and customer benefits that

transcends traditional GIS and mapping boundaries. GIS provides adequate platform for

system representation and manipulation on network models and data base can be accessed

and modified to perform system analysis [4]. Figure 2 showed the image and result for added

poles on planning transformer installation in region 2 the north of Thailand.

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Figure 2 show the image and result for added poles on planning transformer

The various aspects can be analysed by the model of network prepared in GIS and

data available with the geographic (attributes):

-Optimum feeder path,

-Proposal for different layouts for future expansion,

-Selection of optimal conductors,

-Load Flow analysis,

-Cost comparison among different layouts,

-Database management,

-Inventory control,

III Global Positioning System (GPS)The Global Positioning System (GPS) is a technology, which provides accuracy

and flexibility of determination of stationary or moving spatial objects. Its applications

are navigation, surveying, remote sensing, mapping, and geodetic positioning. Geodetic

positioning can be determined either in relation to a well-defined coordinate system, usually

by three coordinate values or in relation to other point, taking one point as the origin of a

local coordinate system. GPS uses satellites and computers to compute positions anywhere

on earth. [2] In electrical power distribution system for finding the location of any object e.g.

poles, substations, transformers, tracking of routes etc. It gives the position in form of latitude

and longitude, which can directly be imported on computerscreen.GPS are becoming very

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effective tools for GIS data capture. The GPS can easily be linked to a laptop, computer in he

field, and, with appropriate software. Users can also have all their data on a common base

with very little distortion. Thus GPS can help in several aspects of construction of accurate

and timely GIS databases [5]. Figure shows the complete digitized map of Satellite imaginary

of GIS on poles transmission line in Thailand. Table 1 show the data collected of location of

poles with its latitude and longitude on substation in EGAT.

Table 1 show the data collected of location of poles with its latitude and longitude on substation in EGAT

Figure 3 show the Satellite imaginary of GIS on poles transmission line in Thailand

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In this study GIS modeling of transformer planning network improving reliability and

quality benefits of GIS and data available with the geographic:

- Optimum feeder path,

- Proposal for different layouts for future expansion,

- Selection of optimal conductors,

- Load Flow analysis,

- Cost comparison among different layouts,

- Database management,

- Inventory control

- Reduction of technical losses

- Long term transformer and distribution planning network etc.

ConclusionGIS based electrical transformer system planning is an area of great importance. Using

GIS (GeographicalInformation System) and GPS (Global Positioning System) technology.

GPS technology has been used to locate those features which are not available in the

satellite imaginary due to its poor resolution e.g. location of poles. Planning is very beneficial

in providing improved customer service and also for increasing the financial position of the

Utility, through reduction of losses. The building of GIS system is the conceptual design

model of GIS-based on power transformer planning power network in Thailand have been

mapped using GIS and it application. The processing capabilities of GIS and the system

ability to manipulate geo-reference data and results in different formats and models make

them suitable for planning and operation of distribution system. The distribution system load

flow based on GIS presented in the paper is an ideal tool for performing the analysis and

viewing the result on map superimposed on other geographic layers. It is allow power system

planners to work on the real system by relating the output to the location of load and feeder

and providing better Long term transformer and distribution planning network etc

BIBLIOGRAPHY[1]Experiences on Implementation of GIS based tools for analysis, Planning and Design

of Distribution System “Dr. M.V. Krishna Rao, Senior Member IEEE, B.S. Varma and Dr. C.

Radlhakrishna” 2008 IEEE.

[2]GIS-based Power Distribution system: A case study for the Bhopal City, “Dr. Tripta

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Thakur” DeIT, Bhopal Tripta.”

[3]http://map.sdsu.edu/geoagent/gis_intro.htm#definition, http://en.wikipedia.org/wiki/

Global_Positioning_System

[4]Whei-Min Lin, Ming-Tong Tsay and Su-Wei Wu, 1996 “Application of Geographic

information system of Geographic nformation Support” IEEE transactions on power System.

Vol. 11 no 1, 1996.

[5]S.P.S. Raghav and Jayant K. Sinha, “Electrical Network Mapping andConsumer

Indexing using GIS”, UPCL,

Short Bio-data of Main AuthorN. Parkpoom is a doctorate on Energy and Power System with 14 years of experience

in the Electricity Generating Authority of Thailand . He Engineering work on system planning

distribution generation planning power system, a company that product electricity generation

and provides electricity to PEA.