Effect of circuit breaker shunt resistance on ferroresonance phenomena in voltage transformer

In this work, it is shown that chaotic ferroresonant oscillations involving voltage transformers (VTs) may be initiated by existing power system apparatus capacitances. It has been shown that various modes of ferroresonant oscillations may exist for the same VT type depending on the initial conditions and on the network capacitance. The effect of line and circuit breaker grading capacitance in ferroresonance and route to chaos has been investigated. It is also shown that switch capacitance has great effect on system behavior.