Title :
Ferroresonance in electromagnetic voltage transformers: a study based on nonlinear dynamics
Author :
Emin, Z. ; Al Zahawi, B.A.T. ; Auckland, D.W. ; Tong, Y.K.
Author_Institution :
Sch. of Eng., Manchester Univ., UK
fDate :
7/1/1997 12:00:00 AM
Abstract :
Ferroresonance in electromagnetic voltage transformers, fed through circuit breaker grading capacitance, is studied using nonlinear dynamics methods. The magnetising characteristic of a typical 100 VA voltage transformer is represented by a single-valued two-term polynomial of the seventh order. The system exhibits three types of ferroresonance: fundamental frequency ferroresonance, subharmonic ferroresonance and chaotic ferroresonance, similar to high capacity power transformers fed through capacitive coupling from neighbouring lines or phases. Results also show that while fundamental frequency and subharmonic ferroresonance can occur under commonplace operating conditions, chaotic states are unlikely in practice
Keywords :
ferroresonance; magnetisation; polynomials; potential transformers; power transformers; 100 VA; capacitive coupling; chaotic ferroresonance; electromagnetic voltage transformers; fundamental frequency ferroresonance; magnetising characteristic; nonlinear dynamics methods; operating conditions; subharmonic ferroresonance; two-term polynomial;
Journal_Title :
Generation, Transmission and Distribution, IEE Proceedings-
DOI :
10.1049/ip-gtd:19971061