Page 39 - MCCB-XT2-XT4

ABB | SACE Tmax XT

S Protection Function
If the current of one or more phases exceeds threshold I2, the protection trips and, after a time established
t by the value read and by the parameter settings, transmits the TRIP command.
I2 S To check and simulate the trip times in relation to all the parameters, please consult:
• the summary table of the protections with the calculation formulas (page 75)
t2 • the graph with trip curve (page 81)
Parameters
I Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu.
Activates/deactivates transmission of the open command. if
Trip Enable disabled, the alarm and exceedance of protection time are only ON
managed as information.
Establishes curve dynamics and the threshold or trip time
calculation:
Curve t = k
• t = k: fixed time trip
• t = k/I : inverse time-delay dynamic trip
2
Establishes the value that activates the protection and
contributes towards calculating the trip time.
Threshold I2 2 In
The value is given as both absolute value (A) and relative value (In)
and can be set within the range: 0.6 In to 10 In, in 0.1 In steps
It is the trip time or contributes towards timing calculation,
depending on the type of curve selected.
Time t2 0.1 s
The value is given in seconds and can be set within the range:
0.05 s to 0.4 s, in 0.01 s steps
Activates/deactivates the thermal memory function (page 67)
Thermal 2
memory NOTE:the function is only available with curve t=k/I OFF

Activates/deactivates the function and selectivity time availability
on the display (page 67)
ZoneSelectivity OFF
NOTE:the function is only available with curve t=k

This is the trip time of the protection with the zone selectivity
function activated and selectivity input not present (page 67)
Selectivity time 0,04 s
The value is given in seconds and can be set within the range:
0.04 s to 0.2 s, in 0.01 s steps
Activates/deactivates the function and availability of the
StartUp enable OFF
associated parameters on the display (page 70)
Protection threshold valid during Startup time, in the conditions
StartUp in which the function is activated (page 70)
Threshold The value is given as both absolute value (A) and relative value (In) 0,6 In
and can be set within the range: 0.6 In to 10 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 70) 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

Limitations and additional functions
• threshold I2 must be higher than threshold I1 (if S protection is activated)
2
• in the presence of curve t= k/I , the protection trip time is forced to t2 if the calculation results
give a theoretical value lower than t2 itself
• the block functions and type of selectivity can also be accessed by means of the service connector
(via Ekip Connect) or communication via system bus (page 67)
• with CB in UL standard configuration, the maximum value of t2 is 400 ms

37 | © 2022 ABB | 1SDH002031A1002 - ECN000212994 Protections | 2 - Standard Protections