ABB SACE Emax 2 Series Operating Instructions Manual page 60

S Protection
t
I2
t2
57 | © 2023 ABB | 1SDH001330R1002 - ECN000297030
Function
If the current of one or more phases exceeds threshold I2, the protection trips and, after a time established
by the value read and by the parameter settings, transmits the TRIP command.
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 95)
• the graph with trip curve (page 101)
Parameters
I
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu.
Activates/deactivates transmission of the open command. If
Trip Enable disabled, the alarm and exceedance of protection time are only
managed as information.
Establishes curve dynamics and the threshold or trip time
calculation:
Curve
Establishes the value that activates the protection and
contributes towards calculating the trip time.
Threshold I2
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
The value is given in seconds and can be set within the range:
0.05 s to 0.8 s, in 0.01 s steps
Activates/deactivates the thermal memory function (page 83)
Thermal
memory
Activates/deactivates the function and selectivity time availability
on the display (page 83)
ZoneSelectivity
This is the trip time of the protection with the zone selectivity
function activated and selectivity input not present (page 83)
Selectivity time
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
associated parameters on the display (page 86)
Protection threshold valid during Startup time, in the conditions
StartUp
in which the function is activated (page 86)
Threshold
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
This is the time for which the StartUp threshold remains
activated, as calculated from the moment the activation
StartUp Time Threshold is exceeded (page 86)
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)
• in the presence of curve t= k/I
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 83)
• with CB in UL standard configuration, the maximum value of t2 is 400 ms
• t = k: fixed time trip
• t = k/I : inverse time-delay dynamic trip
2
NOTE:the function is only available with curve t=k/I
NOTE:the function is only available with curve t=k
, the protection trip time is forced to t2 if the calculation results
2
ABB | SACE Emax 2
Default
OFF
ON
t = k
2 In
0.1 s
2 OFF
OFF
0,04 s
OFF
0,6 In
0.1 s
Ekip Touch - Protections
2 - Standard Protections