ABB SACE Emax E1.2, Operating Instructions For The Design Engineer

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ABB | SACE Emax 2
96 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A Ekip Touch protection trip unit | 13 - G Hi-Touch protections
13 - G Hi-Touch protections
Presentation
The G Hi-Touch protections are available with the Ekip G Hi-Touch trip unit.
List of protections
The following is a list of the G Hi-Touch protections:
Symbol Protection against
ROCOF Rate of change of frequency
S2(V) Voltage control short-circuit
RQ2 Reverse reactive power
Operating principle
The protections have a series of parameters available allowing the user to adjust the activation thresholds and
the opening times of the circuit-breaker.
The operating principle of all the protections is similar: if the frequency or power signal exceeds the set
protection threshold, the specific protection will enter the alarm condition and will begin to delay.
The duration of the delay depends on the threshold and time parameters set, and depending on the dynamic
of the signal we can have two behaviours:
• If the alarm condition persists, the trip unit opens the circuit-breaker.
• If the signal drops below the protection threshold, the trip unit exits from the alarm condition, interrupts
the delay and doesn't open the circuit-breaker.
The protection thresholds are distinguished by type:
• The frequency protections are related to the rated size of the frequency set on the trip unit (Un).
• The power protections refer to the product of current and rated voltage (Sn =
√
3 * In * Un).
IMPORTANT:
• To manage the circuit-breaker tripping with a specific protection, the protection itself
must be enabled and, if supported, must have the Trip Enable parameter activated.
• All the protections have a default configuration: if enabled, check the parameters and
make the necessary changes according to the requirements of your installation.