Abstract
The memristor technology will replace nonlinear resistor applications in suppression of power system overvoltages. A characterization study on Memristance is useful to predict current–voltage characteristics of memristors under different source voltages. A Liquid Memristor (LM) has been chosen in order to study its suitability as a nonlinear resistance for mitigation of an Instrument Transformer overvoltages. The motivation is to investigate the nonlinear property of LM under DC and AC supply voltages in terms of pinching nature and memristance. The simulation response of LM has been validated experimentally for steady state and impulse excitations. The LM is subjected to sinusoidal and triangular supply voltages at 50 Hz and verified for its pinched hysteresis. The response of LM satisfies the standard specifications for (1.2/50) μs lightning and (250/2500) μs switching impulse voltages. The nonlinear resistance of LM shows a varying response for DC voltage instead of single operating point. The memristance of LM is observed to be 1.5 mS under steady state voltage and varied up to 2.89 mS under impulse excitations. The study investigates the dynamic response of LM as a nonlinear system.
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