International Journal of Civil Engineering & Geo-Environmental 6 (2015) __________________________________________________________________________________________________________________ 14 GIS-BASED IDENTIFICATION OF OVERLOADED DISTRIBUTION TRANSFORMERS & CALCULATION OF TECHNICAL ELECTRIC POWER LOSSES 1* Awais Ahmad, 2 Abolghasem Akbari, 1 Javed Iqbal 1 TEAMGIS & National University of Sciences & Technology, Pakistan 2 Faculty of Civil Engineering & Earth Resources, University Malaysia Pahang, Malaysia __________________________________________________________________________________ ____________________________ ______________________________________________________________________________ ______________________ ______________________________________________________________________ 1.0 Introduction Pakistan Energy Sector is and has been for many years facing extreme crisis in energy deficit as a reason of which industrial and commercial activities has suffered a lot. This energy deficit is primarily due to insufficient power generation compared to increasing rate of consumption. A major portion of this deficit is also induced due to loss of power in transmission and distribution networks which unfortunately is aging and inadequate (PDIP, 2011). For a country like Pakistan where power generation projects have not been initialized, it is very important to decrease the loss of power in distribution and transmission network. Regrettably the distribution companies lack the use of efficient and modern equipment and techniques to control the power loss. These non-technical approaches also lead in theft and nonpayment by consumers. It has been already realized the role of modern technologies specially Geographical Information System (GIS) in planning daily operations (Datta, Verma, & Gupta, 1996). The GIS provide a computerized tool for capturing, storing, analyzing and displaying spatial data. This technology can be used to efficiently map and monitor distribution network. GIS has been used in power distribution and utility business worldwide not only for mapping and monitoring but also to improve workforce quality in decision making (Chao, Qiang, Yuanlong, Su, Lihui, &Ludong, 2010). The major challenge that distribution companies face today is the Keywords: Power distribution GPS survey International Journal of Civil Engineering and Geo-Environmental Journal homepage:http://ijceg.ump.edu.my ISSN:21802742 A B S T R A C T ARTICLEINFO This research was designed with the objectives to develop a standalone GIS application for electrical power distribution network companies having the capability of loss calculation as well as identification of overloaded transformers. For this purpose Hilal Road feeder in Faisalabad Electric Supply Company (FESCO) was selected as study area. An extensive GPS survey was conducted to identify each consumer, linking it to secondary pole of the transformer, geo-referencing equipments and documenting conductor sizes. To identify overloaded transformer, accumulative kilowatt hour (kWh) reading of consumer on transformer was compared with threshold kWh. Technical losses of 11kV power transformer and 220V lines were calculated using the data from substation and resistance of the network calculated from the geo-database. To automate the process a standalone GIS application was developed using ArcObjects with engineering analysis capabilities. The application uses GIS database developed for 11kV and 220V lines to display and query spatial data and present results in the form of graphs. The result shows that about 14% of technical loss on both high tension (HT) and low tension (LT) network while about 4 out of 15 general duty transformers were found overloaded. The study shows that GIS can be a very effective tool for distribution companies in management and planning of their distribution network.