Method and device for detecting faults in three-phase power transformer windings n.

摘要

A method for detecting faults in a transformer phase power of n-windings comprising the steps of: - for each of the windings (Wi, where i = 1, ..., n): - measuring the three streams phase (IL1_Wi; IL2_Wi; IL3_Wi), - deciding (7) if the reduction of zero sequence current (I0_Wi) depending on at least one user setting (KWi) and if so, place deduced sequence current zero (I0_Wi) of each of the currents of the three phases (IL1_wi; IL2_wi; IL3_wi), - generating normalized currents by performing a magnitude compensation (3) and an offset compensation phase angle (4) on the results of the previous step, - followed by the steps for each phase (Lx, where, x = 1, 2, 3): - comparing (5) the normalized current of a single winding with the current standard of the other windings, and - generating a fault signal if the difference between the single winding and the other dev anados exceeds a predefined level.