Title :
Digital distance relay with improved characteristics against distorted transient waveforms
Author :
Ohura, Y. ; Matsuda, T. ; Suzuki, M. ; Yamaura, M. ; Kurosawa, Y. ; Yokoyama, T.
Author_Institution :
Tokyo Electr. Power Co. Inc., Japan
fDate :
10/1/1989 12:00:00 AM
Abstract :
A microprocessor-based digital distance relay with improved performance in relation to low-frequency transient oscillation is introduced. New calculation algorithms for the distance element and directional element are discussed. This distance element delivers high measurement performance with an error of less than ±3% against distorted transient waveforms containing low-frequency spectral components using a modified differential approximation algorithm based on a differential equation. The directional element utilizes a pseudo-vector product that is not affected by distortion waves for reliable direction judgement
Keywords :
differential equations; microcomputer applications; power engineering computing; power system protection; relay protection; transients; calculation algorithms; differential equation; distorted transient waveforms; high measurement performance; low-frequency spectral components; low-frequency transient oscillation; microprocessor-based digital distance relay; modified differential approximation algorithm; pseudo-vector product; Capacitance; Differential equations; Frequency; Power cables; Power system faults; Power system relaying; Power system reliability; Power system transients; Protective relaying; Underground power cables;
Journal_Title :
Power Delivery, IEEE Transactions on
