Title :
Mitigating potential transformer ferroresonance in a 230 kV converter station
Author :
Jacobson, D.A.N. ; Swatek, D.R. ; Mazur, R.W.
Author_Institution :
Manitoba Hydro, Winnipeg, Man., Canada
Abstract :
A wound potential transformer failed catastrophically on the Manitoba Hydro system. The failure was attributed to excessive current flow in the primary winding due to a sustained ferroresonance between the circuit breaker grading capacitance and nonlinear magnetizing inductance of the potential transformer. In order to prevent future occurrences, switching guidelines have been revised and permanently connected damping resistors were installed. Modern nonlinear techniques of analysis are evaluated for their suitability of defining safe and unsafe zones of operation. A new two-dimensional bifurcation diagram is proposed as a new visualization tool
Keywords :
HVDC power convertors; HVDC power transmission; capacitance; circuit breakers; data visualisation; ferroresonance; inductance; magnetisation; potential transformers; power engineering computing; substations; transformer windings; 230 kV; HVDC converter station; Manitoba Hydro system; circuit breaker grading capacitance; damping resistors; excessive current flow; ferroresonance mitigation; nonlinear magnetizing inductance; potential transformer ferroresonance; primary winding; safe operation zones; switching guidelines; two-dimensional bifurcation diagram; unsafe operation zones; visualization tool; wound potential transformer failure; Capacitance; Circuit breakers; Damping; Ferroresonance; Guidelines; Inductance; Magnetic analysis; Resistors; Voltage transformers; Wounds;
Conference_Titel :
Transmission and Distribution Conference, 1996. Proceedings., 1996 IEEE
Conference_Location :
Los Angeles, CA
Print_ISBN :
0-7803-3522-8
DOI :
10.1109/TDC.1996.545946
