Browsing by Author "de Silva, PSN"

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item: Conference-Full-text
Automatic Governor for Tie-line Control : A Teaching Tool
(2015-08-03) de Silva, LUN; Deegala, DDMI; Karunathilake, IMM; Kumari, PHSSDI; Lucas, JR; de Silva, PSN
Power transmission between interconnected systems is a major concern in the present electrical engineering context and is of utmost importance to Electrical Engineering undergraduates. A voltage scaled power system simulator with two interconnected areas has been designed, for educational purposes, using vacuum circuit breakers, a diesel generator, a motor-generator set, transmission lines, bus bars, loads etc. Synchronization of two areas and a power controller of the tie line between the two areas have been implemented. In addition, students can learn about different interactions, such as synchronous and isochronous operation of generators with large systems. This paper finally discusses the possible experiences of interconnected power systems that undergraduate students could be exposed to.
item: Conference-Abstract
Develop a series arc fault detector to minimize the risk of domestic electrical fires
(Engineering Research Unit, Faculty of Engiennring, University of Moratuwa, 2019-07) Somathilaka, SP; Sumathipala, WMKS; Senarathna, NT; Hewapathirana, HE; Hemapala, KTMU; Lucas, JR; de Silva, PSN; Prasad, WD; Abeysooriya, R
This study is about the development of a series arc fault detector, which can be used to minimize the risk of domestic electrical fires. Electricity is a common cause of fire in residential buildings. If a parallel electrical arc fault is developed it can be detected from the residual current circuit breaker. If the arc current is higher than the rated current of the circuit, it can be detected from the miniature circuit breaker. But, if a series arc fault is developed which is lower than the rated current of the circuit, it cannot be detected by those conventional devices. In this study, an arc generator which could be connected to any electrical equipment was developed for generating a series arc fault. A set of different methods such as Fast Fourier Transform, Derivative Analysis, Discrete Wavelet Transform and Continuous Wavelet Transform were used to analyze the current and voltage waveforms in the presence and absence of series arc fault. However, only some of those methods yielded promising results. Moreover, an analysis about the parameters which will affect the risk of fire was conducted. Further research regarding the development of the series arc fault detector is in progress.
item: Thesis-Full-text
Preliminary standard for energy efficient domestics buildings in Sri Lanka
de Silva, PSN; Manthilake, MMID
In Sri Lanka the total electricity consumption of domestic units is 40% of the total electricity generated in the country. Especially in the Western province electricity usage is high, compared to other parts of Sri Lanka. By controlling building energy and implementing operational strategies to domestic units, it would provide a great opportunity to reduce domestic consumption. The saved energy could be utilized for industries to develop the nation. The current code of practice published by the SLSEA for energy efficient buildings in Sri Lanka has focused on multistory buildings with higher energy consumption. The specified criterion in the standard does not satisfy domestic units. The increase in demand for domestic energy is a major issue for supply side management. It is vital to study possible approaches to save energy in domestic units and standardization of a code of practice for energy efficient systems for domestic units in Sri Lanka. Mainly the use of electricity of a domestic unit can be categorized into different aspects namely, lighting, ventilation & air conditioning, water heating, etc. A survey was conducted and data was collected from domestic consumers, (sample size: n=50) located in Colombo district. These data were analyzed using SPSS tool to identify significant variables to electricity consumption of domestic units. Use of air conditioners is a trend which is becoming more common in domestic units in Colombo district. Hence, it is desirable to standardize and introduce a code of practice for domestic units at the current stage as a solution for the increasing electricity demand. The conclusions of the analysis reflect that domestic units located in Colombo district can be classified into two main models such as ‘High Income Model and ‘Middle Income Model’. Using Autodesk Revit, Building Information Modeling software, developed two designs. Revit Architecture, Revit MEP are the BIM related software which are used to design an intelligent 3D model with bi-directional associative feature for energy analysis. These models A and B are designed with suitable lighting levels and comfort levels for each defined space. This will reduce the waste of energy of the unit and could be used as a preliminary guide line for energy efficient domestic unit. International energy efficient domestic codes of India and USA are discussed in this paper. This research could be used as a preliminary document for reference and to develop a guideline for practicing authorities to implement energy efficiency in domestic units in Sri Lanka.