RT - Journal Article
T1 - A Novel Method for Impedance Calculation of Distance Relays Using Third Order Interpolation
JF - iut-jcme
YR - 2009
JO - iut-jcme
VO - 27
IS - 2
UR - http://jcme.iut.ac.ir/article-1-448-en.html
SP - 1
EP - 17
K1 - Distance protection
K1 - Impedance calculation
K1 - Distance relay
K1 - Sampling
K1 - Interpolation technique
AB - All algorithms for impedance calculation use an analog-to-digital converter. The high accuracy of the impedance seen by a distance relay is an important factor in the correct isolation of the faulty part of power systems. To achieve this, a novel technique based on third order interpolation is used in this paper. According to this technique, the times and the values of the obtained samples are changed to real ones. To evaluate the new technique, it is applied to six digital distance algorithms, namely, Discrete Fourier Transform (DFT), Half-cycle Discrete Fourier Transform, Least Square, Mann-Morrison, Least Square with Delete Dc, and Prodar70. The technique is found to be capable of accurately computing the impedance in the algorithms mentioned. Comparisons are made among the results to show the efficiency of the new technique for decreasing errors in all algorithms.
LA eng
UL http://jcme.iut.ac.ir/article-1-448-en.html
M3
ER -