ABB SACE Emax 2 Series Operating Instructions Manual page 59

L Protection
t
I1
t1
56 | © 2023 ABB | 1SDH001330R1002 - ECN000297030
Function
If the current of one or more phases exceeds threshold I1, the protection trips and, after a time established
by the value read and by the parameter settings, transmits the TRIP command.
L
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 (from page 98)
Parameters
I
Parameter Description
Establishes curve dynamics and trip time calculation:
• t = k / I
• IEC 60255-151 SI
Curve
• IEC 60255-151 VI
• IEC 60255-151 EI
• t = k / I
Establishes the value that activates the protection and
contributes towards calculating the trip time.
Threshold I1
The value is given as both absolute value (A) and relative value (In)
and can be set within the range: 0.4 In to 1 In, in 0.001 In steps
Contributes towards calculating the trip time.
Time t1
The value is given in seconds and can be set within the range: 3 s
.. 144 s, in 1 s steps
Thermal
Activates/deactivates the thermal memory function (page 83)
memory
Warns that the measured current is near to protection activation
threshold I1.
The value is given in percentage of threshold I1 and can be set
Prealarm I1
within the range: 50% I1 to 90% I1, in 1% steps.
Limitations and additional functions
• threshold I1 must be lower than threshold I2 (if S protection is activated)
• L protection: the trip time of the protection is forcibly set at 1 s if the calculation results give a
lower theoretical tt value and/or if the current reading is more than 12 In
• with CB in UL standard configuration, the only available curve is t = k/I
according to IEC 60947-2
2
according to 60255-151
4
NOTA: the prealarm condition deactivates in two cases:
• current lower than prealarm threshold I1
• current higher than threshold I1
ABB | SACE Emax 2
Default
t = k/I
2
1 In
144 s
OFF
90 % I1
2
Ekip Touch - Protections
2 - Standard Protections