Performance assessment of distance protection fed by capacitor voltage transformer with electronic ferro-resonance suppression circuit

Ferroresonance phenomena in medium‐voltage isolated neutral grids: a case study

“…From the obtained results, the saturation knees of VT#3, VT#4, VT#5 and VT#9 are the lowest ones, being saturated firstly as a consequence of the overvoltages during faults and ferroresonances. To prevent the occurrence of ferroresonances, the VTs must be properly damped by applying some of the approaches in [16,[18][19][20] otherwise the ferroresonance risk zone should be considered before selection of a certain VT. From the previously available data registers and the obtained simulation results, four locations were identified as the most relevant ones for characterisation of the ferroresonance phenomena in the selected distribution power system. These locations were selected taking into account the relevance of the obtained measurements, the configuration of the available protection equipment and the potential operation status of the distribution system.…”

Probabilistic framework for vulnerability analysis of coupling capacitor voltage transformer to ferroresonance phenomenon

“…It is important to mention that the output of a CCVT feeds the monitoring, control and protective devices. Any inconvenient oscillations and inaccuracy affects the quality of decision making and may jeopardise the security of the power system [9][10][11][12].…”

Electronic resistor emulators for ferroresonance damping in MV transformers

“…Commercial equipment for ferroresonance protection and proposals in the literature are based on [9,11,12]: non-electronic and electronic devices. The first ones use passive components such as resistors and saturable inductors to damp the abnormal oscillations.…”