Touch Protections; Presentation - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

9 - Touch protections

Presentation Touch protections are available in all models of releases of the Ekip Touch range.
84 | © 2013 ABB | 1SDH001000R0002 - L7804
The presence of each individual protection depends on the version of the release, as specified
in the following paragraphs.
List of protections
The following is a list of the Touch protections:
Symbol Protection against
L Overload with inverse long-time delay
S
Selective short-circuit
I Instantaneous short-circuit
G Earth fault with adjustable delay
MCR Instantaneous short-circuit on closing of the circuit-breaker
IU Current unbalancing
Hardware trip
Internal circuit-breaker connection error
Harmonic Distortion Distorted wave forms
Current thresholds Thresholds for programmable signals
T Temperature outside range
Neutral Different protection of the Neutral line
The releases of the Emax 2 series also guarantee a non-adjustable fixed protection against
instantaneous short-circuit at high currents, called Iinst.
Operating principle
The protections include a series of parameters that allow the user to adjust the activation
thresholds and the tripping times of the circuit-breaker.
The operating principle of all the protections is similar: if the current 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 current we can have two behaviours:
• If the alarm condition persists, the release opens the circuit-breaker.
• If the current drops below the protection threshold, the release exits from the alarm
condition, interrupts the delay and doesn't open the circuit-breaker.
The protection thresholds refer to the rated current of the rating plug (In).
IMPORTANT:
• To manage tripping of the circuit-breaker 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: in the event of activation,
check the parameters and make changes according to the requirements
of your installation.
ABB | SACE Emax 2
Ekip Touch protection release | 9 - Touch protections