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Theory of fault characterization on power system
Author(s) -
Tsuji Kouichi,
Bandou Matsuo
Publication year - 1996
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391170305
Subject(s) - relay , fault (geology) , nonlinear system , digital protective relay , stuck at fault , matrix (chemical analysis) , computer science , point (geometry) , fault model , protective relay , power (physics) , electric power system , field (mathematics) , electronic engineering , engineering , electrical engineering , fault detection and isolation , electronic circuit , mathematics , physics , materials science , geometry , composite material , quantum mechanics , seismology , pure mathematics , actuator , geology
In the field of protective relay, a dream which is unable to be realized by analogue technology has come true with the advance of computer technology. However, there is still room for the development of a high functional protective system, which makes the most of a merit of digital processing because the present digital relay uses the same principle as an analogous one. The points of proposed theory are that first it uses a lot of data of fault, second uses the first and second Kirchoff laws at the same time which are the starting point of electric circuit theory, and third calculates both fault location and resistance by solving nonlinear simultaneous equations. In this paper high speed calculation for protective relays is achieved by solving a compact matrix using the Newton‐Raphson method. The matrix consists of two sorts of variables (fault location, fault resistance), and the nonlinear simultaneous equation is reduced by definition of new variables. As a result of applying this theory to some real faults, we testified that the fault location error was within 0.1 percent, and the calculation time was less than 5 ms. Therefore we think that this theory has already been in a practical stage. The ultimate goal of this theory is the integration of various algorithms of protective relay, fault locator, and fault restoration operation.