Method and apparatus for monitoring electric insulation conditions in energized electric systems

摘要

A method and an apparatus for monitoring conditions of electric insulation in a live or energized electric system. The invention takes into account the fact that, when the insulation resistance of an electric system is measured under real live conditions, the electric insulation works under voltages and current-leakage conditions which different from those measured in so-called "cold" state. The invention is based on two voltage measurements in one of which the operating conditions of the electric insulation are artificially changed for a known value. Insulation parameters are then calculated by a set of formulas using the results of the two measurements.