Page 59 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
G Protection Function
Ekip Touch calculates the vector sum of the phase currents (L1, L2, L3, Ne) and obtains the internal earth
t fault current (Ig): if current Ig exceeds threshold I4, the protection trips and, after a time established by the
I4 G value read and by the parameter settings, transmits the TRIP command.
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 92)
t4
• the graph with trip curve (page 100)
Parameters
I
Parameter Description Default
Activates/deactivates the protection and its availability in the parameters
Enable OFF
menu.
Activates/deactivates transmission of the open command. if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as ON
information.
Establishes curve dynamics and the threshold or trip time calculation:
Curve • t = k: fixed time trip t = k
2
• t = k/I : inverse time-delay dynamic trip
Establishes the value that activates the protection and contributes
towards calculating the trip time.
Threshold I4 0,2 In
The value is given as both absolute value (A) and relative value (In) and
can be set within the range: 0.1 In to 1 In, in 0.001 In steps
It is the trip time or contributes towards timing calculation, depending on
the type of curve selected.
The value is given in seconds and can be set within the range: 0.1 s to 1
Time t4 s, in 0.05 s steps 0,4 s
NOTE: in the presence of curve: t = k, t4 can also be configured as:
instantaneous; in this mode, the trip time is comparable to that
given for I protection (page 92)
Warns that the measured current is near to the protection activation
threshold.
The value is given in percentage of threshold I1 and can be set within the
Prealarm I4 range 50% I4 to 90% I4, in 1% steps. 90 % I4
The prealarm condition deactivates in two cases:
• current lower than prealarm threshold I4
• current higher than threshold I4
Activates/deactivates the function and selectivity time availability on the
display (page 80)
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 80)
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 associated
StartUp enable OFF
parameters on the display (page 83)
Protection threshold valid during Startup time, in the conditions in which
StartUp the function is activated (page 83)
Threshold The value is given as both absolute value (A) and relative value (In) and 0,2 In
can be set within the range: 0.2 In to 1 In, in 0.1 In steps
This is the time for which the StartUp threshold remains activated, as
calculated from the moment the activation Threshold is exceeded (page
StartUp Time 83) 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

Continued on the next page

57 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Touch - Protections | 2 - Standard Protections