caa a22 4500 463206606 CHVBK 20180405153128.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s00202-006-0006-6 doi (NATIONALLICENCE)springer-10.1007/s00202-006-0006-6 Modified Notch Filter-based Instantaneous Phasor Estimation for High-speed Distance Protection [Elektronische Daten] [Soon-Ryul Nam, Sang-Hee Kang, Jin-Man Sohn, Jong-Keun Park] A novel method for estimating the instantaneous phasor of a fault current signal is proposed for high-speed distance protection immune to a DC-offset. The method uses a modified notch filter in order to eliminate the fundamental frequency component from the fault current signal. Since the output of the modified notch filter is the delayed DC-offset, delay compensation results in the same waveform as the original DC-offset. Subtracting the obtained DC-offset from the fault current signal yields a sinusoidal waveform, which becomes the real part of the instantaneous phasor. The imaginary part of the instantaneous phasor is based on the first difference of the fault current signal. Since a DC-offset also appears in the first difference, the DC-offset is removed from the first difference using the results of the delay compensation. The performance of the proposed method was evaluated for a-phase to ground faults on a 345kV 100km overhead transmission line. The Electromagnetic Transient Program was used to generate fault current signals for different fault locations and fault inception angles. The performance evaluation showed that the proposed method can estimate the instantaneous phasor of a fault current signal with high speed and high accuracy. The paper concludes by describing the hardware implementation of the proposed method on a prototype unit based on a digital signal processor. Springer-Verlag, 2006 DC-offset nationallicence Distance protection nationallicence Estimation nationallicence First difference nationallicence Instantaneous phasor nationallicence Modified notch filter nationallicence Nam Soon-Ryul Next-generation Power Technology Center and Department of Electrical Engineering, Myongji University, 449-728, Yongin, Korea aut Kang Sang-Hee Next-generation Power Technology Center and Department of Electrical Engineering, Myongji University, 449-728, Yongin, Korea aut Sohn Jin-Man School of Electrical Engineering, Seoul National University, 151-742, Seoul, Korea aut Park Jong-Keun School of Electrical Engineering, Seoul National University, 151-742, Seoul, Korea aut Electrical Engineering Springer-Verlag 89/4(2007-03-01), 311-317 0948-7921 89:4<311 2007 89 202 https://doi.org/10.1007/s00202-006-0006-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00202-006-0006-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nam Soon-Ryul Next-generation Power Technology Center and Department of Electrical Engineering, Myongji University, 449-728, Yongin, Korea aut NATIONALLICENCE 700 1- Kang Sang-Hee Next-generation Power Technology Center and Department of Electrical Engineering, Myongji University, 449-728, Yongin, Korea aut NATIONALLICENCE 700 1- Sohn Jin-Man School of Electrical Engineering, Seoul National University, 151-742, Seoul, Korea aut NATIONALLICENCE 700 1- Park Jong-Keun School of Electrical Engineering, Seoul National University, 151-742, Seoul, Korea aut NATIONALLICENCE 773 0- Electrical Engineering Springer-Verlag 89/4(2007-03-01), 311-317 0948-7921 89:4<311 2007 89 202 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer