Control - ABB REF 542plus Technical Reference Manual

REF 542plus REF 542plus
4.4.
22
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual
Line protection
Distance (21)
*
Differential protection
Differential protection for motors and transformer (87)
*
Restricted earth-fault for transformer (87N)
*
Thermal protection
For cables, motors and transformers (49)
*
Motor-specific protection
Number of starts counting (66)
*
Locked rotor (51LR)
*
Motor start (51MS)
*
Low load (37)
*
Unbalanced load (46)
*
Power quality mitigation
Power factor controller (55)
*
Switching resonance protection
*
THD protection
*
Other protections and related functions
Frequency protection (81), 6 thresholds per net
*
Synchro check (25)
*
Fault recorder
*
Autoreclosure (79)
*
Lock-out (86)
*
Reverse power (32).
*
At most 24 protection functions can be installed inside the
REF 542plus unit. The maximum number is anyway dependent upon
the available processing power.

Control

The control and automation capabilities inside the REF 542plus are extremely
powerful. Simple interlocking against switching errors as well complex load-
shedding schemes can be easily implemented with the control possibilities offered
by the REF 542plus.
1MRS755859