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Additional losses in transformers due to harmonic currents and voltages cause further heating in their structural parts, and damage its suitable operation, thereby reducing their lifetime. This paper proposes an energy efficiency study in a three-phase dry-type transformer, which compares temperature measurements obtained from a 10kVA three-phase dry transformer on both sinusoidal and non-sinusoidal...
Rooftop PV has an advantage that it can reduce the load supplied by nearby distribution transformers. This in theory should make the transformer run cooler, and therefore extend the remaining life of its paper insulation. However, the relative impact of harmonics on transformer life is sometimes neglected. In this article we present the findings of an analysis on the new rooftop PV installation at...
Under harmonic conditions, caused by nonlinear loads, losses and temperature inside the power transformer increase. The hot spot temperature is one of the major limiting factors that affect the transformer life time and its loading capability considerably. This paper presents the determination of field distribution on the transformer components as well as its losses using finite element method (FEM)...
This paper addresses the impacts on distribution transformers due to increasing PHEV loads on the distribution infrastructure, while conducting PV compensation (harmonics compensation). The authors have addressed the utilization of a rapid-prototyping control methodology coupled with a real-time digital simulator to facilitate the integration of a Photovoltaic (PV) inverter with the grid. Multi-string...
In this paper, a number of methods for neutral current compensation using magnetics are proposed and these are compared with reported techniques. The proposed neutral current mitigation techniques include a Scott-transformer, T-connected transformer, star-hexagon transformer and star-polygon transformer designed for mmf (magneto motive force) balance. These transformer configurations along with the...
Transformers are expensive equipment in the power system. Determination of life of transformer is very important as damages in a transformer cause long interruption of power supply. The life of a transformer is determined by the life of the insulation which in turn is assessed by the maximum temperature rise inside the transformer. The factors which affect the transformer life include harmonics, faults,...
Transformers are one of the main equipments of distribution systems. Increase in transformer loss is mostly the source of the damages, and caused by increased harmonic contents, especially current harmonic. These losses will result in an increase in temperature of various parts of transformer, especially its hot-spot temperature, and this temperature increase leads to insulation life reduction. Therefore,...
The significance of harmonics in power systems has increased substantially due to the use of solid state controlled loads and other high frequency producing devices. An important consideration when evaluating the impact of harmonics is their effect on power system components and loads. Transformers are major components in power systems. Supplying non-linear loads by transformer leads to higher losses,...
The portion of the loads which cause harmonic currents is increasing due to the rising prevalence of power electronic components. The use of these loads has increased the awareness of the potential risks due to the transformer overheating. Nowadays, it is well-known that the transformer loading must be restricted for safe operation under non-linear load currents. Conventionally, IEEE C57.110-1998...
The portion of the loads which cause harmonic currents is increasing due to the rising prevalence of power electronic components. The use of these loads has increased the awareness of the potential risks due to the transformer overheating. Nowadays, it is well-known that the transformer loading must be restricted for safe operation under non-linear load currents. Conventionally, IEEE C57.110-1998...
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