A new method for decaying dc offset removal for digital protective relays |
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| Affiliation: | 1. Electrical Engineering Department, Basque Country University, Alda. Urquijo s/n, 48013 Bilbao, Spain;2. Applied Mathematics Department, Basque Country University, Alda. Urquijo s/n, 48013 Bilbao, Spain;1. ABB AB, S-721 59 Västerås, Sweden;2. Wroclaw University of Science and Technology, Wyspianskiego 27, 50-370 Wroclaw, Poland;1. Center for Research and Advanced Studies of the National Polytechnic Institute, Zapopan, Jal. 45019, Mexico;2. School of Electrical Engineering and Computer Science, Washington State University, Pullman, WA 99163, USA;3. Department of Electrical Engineering, Autonomous University of Nuevo León, Monterrey, NL 66450, Mexico;1. Končar Electrical Engineering Institute, 10000 Zagreb, Croatia;2. Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia |
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| Abstract: | Voltage and current signals used in protection devices may contain harmonics and decaying dc offset in transient states. Because of this, protection devices must contain filters to remove the part of the signal which is not of interest and estimate the value of the component or components which are to be used for protection functions.Traditionally, the discrete Fourier transform (DFT) filter has been used in digital protection devices. This filter has the advantage of being easily applied, but the disadvantage that when an exponentially decaying component is present the results obtained are incorrect. Because of this, different algorithms based on the DFT have been developed in order to remove the decaying dc offset and reduce digital processing errors.This paper describes a new method for removing the exponential component associated with electrical signals in transient states. Its ease of application results in a low computational load as compared with other methods. This characteristic, together with the accuracy of results, makes this new method suitable for application in real time on protection devices. |
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