ABB SACE Tmax XT7 Operation And Maintenance Manual page 48

S2 Protection
t
I5
46 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
Function
S2 protection functions in the same way as S protection: if the current of one or more phases exceeds
threshold I5 for longer than time t5, the protection activates and sends a TRIP command.
S2
NOTE: unlike S protection, S2 protection only has one fixed time trip curve and has no thermal
memory
t5
It is independent of S protection, thus thresholds and functions of the two protections can be programmed
so as to take advantage of different plant solutions (example: signaling with S and open command with S2 or
I
vice versa, or both S and S2 for signaling or tripping).
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 87)
• the graph with trip curve (page 95)
Parameter
Enable
Trip Enable
Threshold I5
Time t5
ZoneSelectivity
Selectivity time
StartUp enable
StartUp
Threshold
StartUp Time
Limitations and additional functions
• threshold I5 must be higher than threshold I1 (if S2 protection is activated)
• 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 77)
• with CB in UL standard configuration, the maximum value of t5 is 400 ms
Description
Activates/deactivates the protection and its availability in the
parameters menu.
Activates/deactivates transmission of the open command. if disabled,
the alarm and exceedance of protection time are only managed as
information.
Establishes the value that activates the protection and contributes
towards calculating the trip time.
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 trip time of the protection.
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 function and selectivity time availability on
the display (page 75)
NOTE: if at least two of the selectivity S, S2, I, 2I and MCR are
enabled, the input and output are shared with the OR function;
it is sufficient that even a selectivity is activated to stimulate
inputs and outputs
This is the trip time of the protection with the zone selectivity function
activated and selectivity input not present (page 75)
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
parameters on the display (page 78)
Protection threshold valid during Startup time, in the conditions in
which the function is activated (page 78)
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 and
is calculated from the moment the activation Threshold is exceeded
(page 78)
The value is given in seconds and can be set within the range: 0.1 s to
30 s, in 0.01 s steps
ABB | SACE Tmax XT
Default
OFF
ON
4 In
0,05 s
OFF
0,04 s
OFF
4 In
0.1 s
Protections | 7 - Standard Protections