F37, F46N, F50/51, F50N/51N, F51BF, F68
It is convenient for protection of condensers which have been grounded against the over and unbalanced loads with the characteristics of programmable constant and inverse time.
Relay measures the three-phase current values and unbalanced current fed from four low impedance inlet. Over load is measured as phase currents which are revealed by three main current transformers.
Its phase functions calculate the harmonics as inversely proportional. Inlet of unbalanced current includes the 3. Harmonic active filter.
