Voltage transformer ferroresonance in cogeneration substation

Characterization of ferroresonant modes in HV substation with CB grading capacitors

“…It refers to an oscillating phenomenon between a non-linear inductance and a capacitor that can result in highly distorted overvoltages and overcurrents. Analytical work, digital simulation studies, field measurements and lab tests have been widely reported [1][2][3][4][5][6][7][8][9][10][11][12][13]. Despite the extensive literature available, ferroresonance still remains widely unknown and it is generally feared by power systems operators, as it seems to occur at random, normally resulting in the catastrophic destruction of plant equipment.…”

“…Similar filed experiences of VT ferroresonance in HV substations have been reported in refs. [7][8][9][10][11][12]. …”