ABB SACE Emax E4.2 - Protections; Operating Principle

ABB | SACE Emax 2
Ekip Touch protection trip unit | 5 - Protections11 | © 2018 ABB | 1SDH001316R0002 - ECN000086018 - Rev. C
5 - Protections
Operating principle
All the protections present in the electronic trip units with a display (Ekip Touch, Ekip Hi-Touch, Ekip G Touch,
Ekip G Hi-Touch) have a delay time before entering alarm state and tripping the circuit-breaker.
The duration of the delay depends on the parameters set: threshold, time, curve. Depending on the current
read by the trip unit, there are two possible behaviours:
• Current above the protection threshold, persistent alarm condition, the trip unit will open the circuit-breaker.
• Current below the protection threshold, alarm condition and delay interrupted.
The protection threshold relates to different parameters, according to the type:
Type Reference
Current Nominal current of the rating plug (In).
Voltage Rated voltage set (Un)
Frequency Frequency set (fn)
Power Current multiplied by rated voltage (Sn = √3 * In * Un)
IMPORTANT:
• To manage the tripping of the circuit-breaker through a specific protection, the
protection itself must be enabled.
• All the protections have a default configuration: if enabled, check the parameters and
make the necessary changes according to the requirements of your installation.