FERRORESONANCE IN ELECTRICAL NETWORK 6-35 kV

Ferroresonance in 6-35kV electrical networks and the cause of power voltage transformer damage are considered. To study ferroresonance, a reliable dynamic model of nonlinear transformer inductance is established and more accurate equations for determining equivalent parameters are derived. On the basis of the dynamic model, the Weber-Ampere characteristic of the transformer core with instantaneous values of currents and flux-currents is constructed. Boundary conditions of ferroresonance stability and determination of boundary values of network capacitance are given on the example of calculation of equivalent parameters of energy-saving power voltage transformer TMG12-250/35