Showing papers on "Voltage sag published in 1993"

Voltage sag analysis case studies

Abstract: This paper summarizes the results from a number of different voltage sag investigations. These investigations involve characterizing the voltage sag performance at a customer facility and evaluating equipment sensitivity to different voltage sag magnitudes and durations. Possible solutions to voltage sag sensitivity problems are also described. >

Proposed chapter 9 for predicting voltage sags (dips) in revision to IEEE Std 493, the Gold Book

Abstract: Voltage sags, also known as dips, are increasingly important to industrial reliability. Modern process controls are often sensitive to voltage sags. The combination of a voltage sag and sensitive equipment may cause significant production outages. Less sensitive equipment may be available at a premium price, but the designer must know the sag characteristics of the electric system to make the best choices between reliability and cost. This proposed chapter offers a way to predict voltage sag performance without long term monitoring and before plants are constructed. The analysis technique proposed for a new chapter 9 in the next revision of IEEE std 493 is shown. >

Method for reliability analysis of industrial distribution systems

Abstract: The method for reliability analysis of industrial distribution systems presented in this paper combines a Monte Carlo simulation with an electrical network model. The Monte Carlo simulation generates fail and restore events in stochastic components. The flexibility of the Monte Carlo simulation made it possible to include ageing of components and preventive maintenance. As industrial loads are often sensitive to short-duration voltage sags, the influence of these sags had to be included in the model. This is done by using the maximum permissible voltage sag at the load nodes as an interruption criterion. The occurrence of a short-circuit and the intervention by the protection are modelled in detail. Mal-trips as well as fail-to-trip of the protection are included. The method presented in this paper is suitable for industrial (and other) distribution systems where sensitive loads are present, where maintenance of components is important and/or where the behaviour of the protection influences the reliability.

Suppression of flickers in an arc-furnace supply system by an active capacitance-a novel voltage stabilizer in power systems

Abstract: Recently, a good deal of attention has been paid to Series Active Filters (SAF) as an isolator between source and load as a means of avoiding an anti-resonance, or series resonance. Here, the authors propose a novel control strategy to stabilize power system voltage in which an SAF operates as an active capacitor and compensates for voltage drops due to a source impedance. The authors have conducted a simulation and an experiment based on the strategy. The research showed satisfactory results and the authors conclude that the strategy could be applied to Flexible AC Transmissions Systems (FACTS) [1].

Survey of recent voltage sag papers from 'around the world'

Abstract: A focused survey of recent voltage sag related papers from around the world is presented. Discussion of these papers emphasizes the possibilities for international standardization on the characterization of sag voltages, and sensitive electronic equipment ride-through to withstand sags. International standards that will result in sag voltage compatibility between power systems and sensitive industrial and commerical electronic equipment, such as adjustable speed drives and programmable logic controllers, are strongly recommended by the author. >