GIS Survey and Mapping for Efficient Power Distribution
About the project
Restructured Accelerated Power Development and Reforms Programme, abbreviated R-APDRP, was launched by the Ministry of Power, Govt. of India. The primary objective of R-APDRP was the restoration of commercial viability of the power distribution sector via implementation of appropriate measures for curbing the Aggregate Technical and Commercial (AT&C) losses different states of India.
Objectives of the Project
The projects under this scheme were taken up in two parts:
- Part A includes the projects with the objectives of establishing baseline data and appropriate IT applications for the purpose of energy accounting/auditing as well as creating an IT service center for consumers.
- Part B of the scheme comprises regular projects for strengthening electricity distribution that include system improvement, strengthening, augmentation etc.
Owing to the benefits of geospatial technology, the Union Ministry of Power (MoP) has mandated its usage in the National Electricity Policy and Integrated Energy Policy.
Being a core GIS company with a complete range of geospatial solutions, we took up the challenge of executing the process of DGPS survey, mapping, GIS data creation and integration under R-APDRP Part-A in nearly 100% of the selected towns of West Bengal, Assam, Mizoram, Arunachal Pradesh etc. under coverage of the scheme.
Base Map Development
The process of base map creation started with the collection of various kinds of inputs including satellite images, control points along with sketches and projection parameters. The image quality of the satellite inputs was enhanced using image processing techniques for reduction of haze, edge enhancement and tonal variation.
Some of the steps implemented for base map development are mentioned below:
- Geo-referencing using the GCPs (Ground Control Points) for the desired sub-meter accuracy
- Digitization of Admin boundaries (data input was collected from utility and respective authority) after necessary ground verification
- Digitization/capture of land base features from satellite imagery.
- Landmark survey and attribute data collection as per data model using DGPS technology
- Updating land base based on the output of the field verification
Technical Audit of Electrical Substation
The primary purpose of the technical audit was the development of the Single Line Diagram (SLD) of the electrical substation. An SLD provides a clear picture of the assets and their connectivity to the substation. The steps for accumulating the data included the following:
- The substation area and its boundary were marked using a handheld device to obtain the accurate periphery of the substation.
- All electrical elements inside the substation were identified and drawn on a hardcopy map.
- DGPS points were noted for exact mapping of electrical assets placed in the switchyard.
- Assets of all the sub-stations including capacitors, isolators, breakers, CTs, PTs, relays, supports, meters etc.
- All the attribute information of each particular feature available on site was captured as per the finalized Data Model for that feature.
- The network connectivity as available in the substation was drawn on hard copy.
- The hard copy map also portrayed the power-flow information of the source and the destination.
- Administrative and technical support was availed for the smooth collection of substation data.
Distribution Network Survey and Mapping
The objective of Network Survey was to geographically map each electrical network asset including 66/33, 66/11, 33/11 kV electricity substations, HT (66, 33, 11kV) overhead lines/underground cables along with associated line equipment such as Poles, RMUs, Distribution Transformers, Capacitors etc. and also LT overhead lines and underground cables along with associated equipment such as poles, feeder pillar boxes etc. on the geo-referenced base maps of the specified areas using DGPS technology maintaining sub-meter accuracy level.
The mapping activity also comprised collecting and updating the various attributes of Electrical network entities as per finalized Data Model approved by the utility. The attributes thus collected were linked to the corresponding Network elements which had been mapped through field survey. Consequently, a one-to-one linkage was created for any further data retrieval and analysis.
Asset Codification Including Painting
All surveyed and mapped electrical equipment were codified based on the codification logic approved by the Utility team. The asset numbers provided in the Codification Document were painted on the surfaces of all Poles and Distribution transformers as per the specifications provided by the Utility team at the commencement of the project. The following steps were implemented:
- The necessary activities towards Surface Creation, Base Coloring etc. were completed before writing the codes.
- The asset codes were written legibly to ensure uniformity.
- The specifications of the code painting including color combination, the height of the painting, text size, font, orientation etc. were implemented as per the requirement of the utility.