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This paper describes a case study to find the location of the voltage sag source at a petroleum industry where sags are causing undesired trips on critical loads. The network that supplies this industry is operated by basically two transmission and distribution utilities. Therefore, finding the location of the disturbance source is a first step in mitigation and decisive in allocating responsibilities.
Voltage fluctuations leading to lamp flicker can propagate from the point of origin to various parts of the power system with some attenuation depending on the system impedances and load composition. Field measurements and theoretical studies suggest that the industrial loads containing large proportions of induction motors assist in attenuating flicker compared to residential loads consisting of...
Power quality monitoring has become a standard task in electrical network management. The standards currently in place provide minimum requirements, since they want to create a level playing field that allows analyzers from different manufacturers to give the same results. It is good idea in concept, but it also acts as double edged sword. Manufacturers design their product to comply with these standards...
- In the management of Power Quality to customers, voltage dip performance has often been done on the basis of contracted or regulatory voltage dip limits [3]. In South Africa, such limits were statistically derived for various voltage levels using (limited) data available for all measured sites in South Africa over a period of a few years. A very different approach was introduced by the National...
Utilities require a high storage capacity to characterize voltage sag on the power system network. The RMS has limited capability and can only acquire event magnitude and duration information. In this paper the authors propose a measurement technique based on instantaneous tracking of the amplitude phase and frequency of a non-stationery sinusoid. From the tracked parameters, the amplitude, duration...
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