Touch Protections; Presentation - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

9 - Touch protections

Presentation Touch protections are available in all models of trip units of the Ekip Touch range.
61 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
The presence of each single protection depends on the version of the trip unit, as specified in the following
paragraphs.
List of protections
Touch protections:
Symbol
L
S
I
G
2I
MCR
IU
Hardware Trip
Harmonic Distortion
Current thresholds
T
Neutral
The trip units of SACE Emax 2 series also guarantee a non-adjustable fixed protection against instantaneous
short-circuit at high currents, called Iinst.
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 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 two behavoiurs are possible:
• If the alarm condition persists, the trip unit opens the circuit-breaker.
• If the current drops below the protection threshold, the trip unit exits from the alarm condition, interrupts
the delay and does not make the circuit-breaker open.
The protection thresholds refer to the rated current of the Rating Plug (In).
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.
Protection against
Overload with inverse long-time delay
Selective short-circuit
Instantaneous short-circuit
Earth fault with adjustable delay
Programmable instantaneous short-circuit
Instantaneous short-circuit on closing of the circuit-breaker
Current unbalance
Circuit-breaker internal connection error
Distorted waveforms
Programmable signal thresholds
Temperature outside range
Neutral protection
ABB | SACE Emax 2
Ekip Touch protection trip unit | 9 - Touch protections