Damping effect of load on the ferroresonance phenomenon in power networks

Spectral and statistical analysis for ferroresonance phenomenon in electric power systems

“…The ferroresonant conditions generally occur when the system is unbalanced, like switching or the serial connections of the capacitors with transformer magnetizing impedance. This situation causes failures in transformers, cables, and arresters as well as overvoltages [1][2][3][4][5][6][7][8][9][10][11][12][13]. The ferroresonance phenomenon is more prevalent at high voltage levels since the relative ratios of losses, magnetizing impedance and cable capacitance fall into their more favorable ranges here [7,8,10].…”

Ferroresonance Phenomenon in Power Transformers - Experimental Assessment

“…Therefore, there may not be a case where the inductive reactance is equal to the capacitive reactance, but yet very high and damaging overvoltages occur. In power system the ferroresonance occurs when a nonlinear inductor is fed from a series capacitor [1][2][3][4]. The nonlinear inductor in power system can be due to: a) The magnetic core of a wound type voltage transformer, b) Bank type transformer, c) The complex structure of a 3 limb three-phase power transformer (core type transformer), d) The complex structure of a 5 limb three-phase power transformer (shell-type transformer).…”

“…Ferroresonance is a general term applied to a wide variety of interactions between capacitors and iron-core inductors that result in unusual voltages and/or currents [1][2][3][4][5]. In linear circuits, resonance occurs when the capacitive reactance equals the inductive reactance at the frequency at which the circuit is driven.…”

“…From these studies, we can define the ferroresonance phenomena as it is a special case of jump resonance phenomena. Jump resonance refers to circuits containing a nonlinear inductor and a linear capacitor with or without some other elements present [1]. For certain circuit parameters, if an incremental change in the amplitude or frequency of the input to the circuit causes a sudden jump in signal amplitude somewhere in the circuit, jump resonance is said to have occurred.…”

“…One of the most serious problems in electrical power systems is the possibility of over-voltages resulting from a ferroresonant condition [1][2][3][4][5][6]. Ferroresonance is a mysterious phenomenon that seems to occur capriciously, causing much concern among utility operating personnel.…”