Earth connection method for recognizing and locating earth connections with low and high impedance measures frequencies different from a mains frequency

摘要

Cumulative admittance (CA) to earth is tested and calculated at a point in time for each leakage. Feeding two currents with different frequencies and simultaneous testing evaluation of both frequencies and a mains frequency very quickly produces a calculation for leakage non-symmetry. A change in mains-frequency displacement voltage can act as a triggering criterion for calculating CA.