Nullam AMR

Undervoltage protection

Trips when the voltage falls below the setting.

Trips when the voltage rises above the setting.

Tutela non-directional overcurrent

Instantaneous (50) and IDMT time-delayed (51) tripping on overcurrent and short circuit.

Praecomprehensio tutelae Non-directional

Instantaneous and time-delayed protection against residual current and phase-to-earth faults.

Tutela directiva supercurrent

Overcurrent that checks the power direction, operating only for forward or reverse faults.

Directional Grounding Protection

Directional earth fault, for ring networks and parallel feeders.

Negans pars overcurrent praesidium

Detects unbalance, broken conductors and single phasing from the negative-sequence current.

Onerare praesidium

A thermal model of the plant that trips before a cable, transformer or motor overheats.

Clavis defectum tutelae

Trips the upstream breakers when a breaker fails to open after a trip command.

munus deprehendatur onus frigus (CLP)

Raises the settings for a while after a long-dead feeder is re-energised, avoiding nuisance trips.

Accurrere current deprehendendi munus

Recognises transformer inrush from the second harmonic and blocks false trips.

Custodia differentialis

Compares the currents into and out of the plant and clears faults inside the zone fast.