Study of the patterns of change in absorption current over time and its use for measuring insulation resistance

Abstract The article presents a computer simulation of absorption currents in dielectrics. The results of the study of changes in the absorption currents in time, as well as accelerated measurement of the insulation resistance taking into account the absorption current, are considered. When measuring the insulation resistance of electric power facilities, the absorption current which flows through the insulation and drops to zero in a very long time may initially exceed the leakage current. The article analyzes various patterns of representing the absorption current and proposes a new formula containing exponential and power functions. An approach is proposed for accelerated measurement of insulation resistance using extrapolation of absorption currents, that is, the calculation of the value (forecast) of the steady-state current in the measuring circuit, without waiting for the end of the absorption current flow and transients.