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This paper presents the results of new hexagonal configuration at the T-joint of three-phase transformer core. The proposed model is compared with previous T-joint design, Butt-lap, which is widely used at present by many transformer manufacturers. The magnetic flux density distribution and core loss of a transformer rated 1000kVA are analyzed for the two types of T-joint design. The 3D simulation...
Among the alternative fluids considered for application in transformers are Palm Oil (PO) and Coconut Oil (CO). Among the important studies that need to be carried out before it can be applied in-service is the lightning impulse performance. This paper presents the experimental work on the lightning impulse breakdown voltage of different PO, CO and Mineral Oil (MO). The PO used in this is the Refined...
The value of soil resistivity is an essential pre-requisite in designing an electrical grounding system. The current practice, as advocated even by national/international standards involves taking the average soil resistivity of the site as the parameter to be considered in designing the grounding system. This study shows that average soil resistivity may lead to significant overestimation or underestimation...
As the transformers are one of the expensive equipment of power systems optimum loading is notified by designers, nowadays loading was done base on the IEC and IEEE standards according to the hot spot temperature (HST) as an effective criteria on loading and overloading. To predict HST and TOT, many principal models have been proposed such as classic thermal, alternative thermal and dynamic thermal...
Lightning performance of distribution line is an important issue in the countries with high lightning density such as Malaysia. Many studies have been carried out to investigate the lightning performance and thus protect the overhead line from this overvoltage. This paper presents the line performance sensitivity studies of a special 33kV line underbuilt on transmission structure by mean of line arrester...
Over hundreds of years in worldwide, many of damages and fatalities caused by lightning have been reported with severed had injured in a short or long term effect. This work aims to model and analyse the different aspects of lightning mechanism in relation to the current and voltage distributions across the human body. The works have been carried using the electromagnetic transient program via transient...
In this paper, the application of an Artificial Neural Network (ANN) for remedial action of a power system is presented. The aims of this study are to find the significant control action that alleviates a bus voltage violation of a power system and to demonstrate the ability of a neural network in terms of evaluating the generation re-dispatch and load shedding amounts. The remedial action is based...
Distributed energy resources have numerous benefits, of which is transmission network upgrade deferral. This application is particularly important where there are constraints in upgrading of the existing or construction of new generation units and transmission circuits. This paper presents a cost comparison of the central plant option and DG in meeting additional load demand. The economic analysis...
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