Improvement of Algorithm for Formation of Orthogonal Components of Input Quantities in Microprocessor Protection

The use of orthogonal components (OC) underlies the construction measuring elements modern protection and automation devices. In most microprocessor-based protections, component input signal is extracted using a discrete Fourier transform (DFT). DFT disadvantages are its low speed, which more than one period fundamental frequency, as well sensitivity to free aperiodic component, creates significant conversion errors depending on time constant decay. Such settling true output often unacceptable for design high-speed paper proposes form OC equivalent according values cosine sine harmonic, formed by multiplying them resulting correction factor. developed algorithm formation signals in microprocessor protections characterized high speed transient modes it has wide functionality. So, proposed digital device forming an signal, comparison with filter based DFT, increased operating both mode occurrence short circuit during decay monitored while maintaining same characteristics other modes. A block diagram been developed, all blocks can be implemented microelectronic element base. model specified dynamic modeling system MatLab-Simulink accordance structural diagram. As result calculations, (up two times) increase performance established shapers DFT.