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Advanced Algorithm for IED of Stator Winding Protection of Generator System  

Park, Chul-Won (강릉대학교 전기정보통신공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.57, no.2, 2008 , pp. 91-95 More about this Journal
Abstract
The large AC generator fault may lead to large impacts or perturbations in power system. The generator protection control systems in Korea have been imported and operated through a turn-key from overseas entirely. Therefore a study of the generator protection field has in urgent need for a stable operation of the imported goods. In present, the algorithm using the current ratio differential relaying based DFT for stator winding protection or a fault detection had been applied that of internal fault protection of a generator. the DFT used for the analysis of transient state signal conventionally had defects losing a time information in the course of transforming a target signal to frequency domain. In this paper, the discrete wavelet transform (DWT) was applied a fault detection of the generator being superior to a transient state signal analysis and being easy to real time realization. The fault signals after executing a terminal fault modeling collect using a MATLAB package, and calculate the wavelet coefficients through the process of a muiti-level decomposition (MLD). The proposed algorithm for a fault detection using the Daubechies WT (wavelet transform) was executed with a C language and the commend line function for the real time realization after analyzing MATLAB's graphical interface. The advanced technique had improved faster a speed of fault discrimination than a conventional DFR based on DFT.
Keywords
Daubechies; DFR; DFT; MATLAB; MLD; Fault Discriminant; Generator Protection; Wavelet Transform;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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