Page 41 - MCCB-XT2-XT4

ABB | SACE Tmax XT

I Protection Function
If the current of one or more phases exceeds threshold I3, the protection trips and, after a non-
t programmable fixed time, transmits the TRIP command.
I3 I To check and simulate the trip times in relation to all the parameters, please consult:
• summary table of the protections with the operating characteristics (page 75)
• the graph with trip curve (page 83)
Parameters
I Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable ON
parameters menu.
Establishes the value that activates the protection.
Threshold I3 The value is given as both absolute value (A) and relative value (In) 5,5 In
and can be set within the range: 1.5 In to 15 In, in 0.1 In steps
Activates/deactivates the function
NOTE: if at least two of the selectivity S, S2, I, 2I and MCR
ZoneSelectivity are enabled, the input and output are shared with the OR OFF
function; it is sufficient that even a selectivity is activated to
stimulate inputs and outputs
Activates/deactivates the function and availability of the
StartUp enable OFF
associated parameters on the display (page 69)
Protection threshold valid during Startup time, in the conditions
StartUp in which the function is activated (page 69)
Threshold The value is given as both absolute value (A) and relative value (In) 1,5 In
and can be set within the range: 1.5 In to 15 In, in 0.1 In steps
This is the time for which the StartUp threshold remains
activated, as calculated from the moment the activation
StartUp Time Threshold is exceeded (page 69) 0.1 s
The value is given in seconds and can be set within the range: 0.1
s to 30 s, in 0.01 s steps

Ekip M Touch
With Ekip M Touch, I protection is inhibited for 100 ms if the currents detected by the Trip unit cross zero
when at least one is present (0.25 In fixed control threshold). The default value is different: 6 In.
Limitations and additional functions
• protection cannot be deactivated in “Non-defeatable instantaneous protection” version; consult
catalog for further details (1SdC200023d0209)
• threshold I3 must be higher than threshold I2 (if S and I protections are activated)
• I protection can be activated with MCR protection disabled
• the block functions can also be accessed by means of the service connector (via Ekip Connect) or
communication via system bus (page 70)

39 | © 2022 ABB | 1SDH002031A1002 - ECN000212994 Protections | 2 - Standard Protections