Aktaibi, Adel (2015) Wavelet packet transform and direct-quadrature axis-based hybrid technique for differential protection of power transformers. Doctoral (PhD) thesis, Memorial University of Newfoundland.
- Accepted Version
Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Detecting and identifying the disturbances in power transformers have always been challenging tasks for accurate and reliable protection of power transformers. Several approaches have been tested for designing protective devices such as DFT, ANN, fuzzy logic and wavelets etc. The modern power system is highly polluted with harmonics, and the transient disturbances usually are non-stationary and non-periodic. Thus, these techniques may not be adequate for protection of newer power transformers. Current research indicates that the wavelet packet transform (WPT) provides fast and accurate distinguishing criteria for this purpose, because WPT do not suffer from such problem. However, such wavelet based relay requires a certain sampling frequency for its analysis, which may have some impact on the new trend of interconnected protection system. According to IEEE standards (C57.116) and (1547), the requirement of 6 cycles of fault duration is valid for conventional and newer interconnected power transformer protection system. This research introduces a new dqWPT-based hybrid technique for the protection of power transformers to be integrated with the operation and control circuits without affecting their performance. The
|Item Type:||Thesis (Doctoral (PhD))|
|Additional Information:||Includes bibliographical references (pages 189-203).|
|Keywords:||Power Transformer, Differential Protection, Wavelets, WPT, Faults|
|Department(s):||Engineering and Applied Science, Faculty of|
|Library of Congress Subject Heading:||Electric transformers--Protection--Simulation methods; Wavelets (Mathematics); Transformations, Quadratic|
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