ABB 615 series Technical Manual page 241

1MAC059074-MB A
615 series ANSI
Technical Manual
• The fictive voltage is discarded after Voltage Mem time
• The phase angle cannot be reliably measured before the fault situation.
67/51P, 67/50P can be forced to the non-directional operation with the NON_DIR input.
When the NON_DIR input is active, 67/51P, 67/50P operates as a non-directional
overcurrent protection, regardless of the Directional mode setting.
Operating
quantity
Memory function
operate zone
Min trip
current
GUID-C30CD1A2-93E2-4A92-9FF3-58B7B2A98458 V1 EN
Figure 113: Operating zones at minimum magnitude levels
Level detector
The measured phase currents are compared phasewise to the set Pickup value. If the
measured value exceeds the set Pickup value, the level detector reports the exceeding of
the value to the phase selection logic. If the ENA_MULT input is active, the Pickup value
setting is multiplied by the Pickup value Mult setting.
Operating zone
Non-operating zone
Min trip
voltage
Section 4
Protection functions
Polarizing
quantity
235