ABB XT7, Руководство по эксплуатации и обслуживанию

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ABB | SACE Tmax XT
Protections | 7 - Standard Protections 47 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
I Protection
I I3
t
I
Function
If the current of one or more phases exceeds threshold I3, the protection trips and, after a non-programmable
fixed time, transmits the TRIP command.
To check and simulate the trip times in relation to all the parameters, please consult:
• summary table of the protections with the operating characteristics (page 87)
• the graph with trip curve (page 96)
Parameters
Parameter Description Default
Enable
Activates/deactivates the protection and its availability in the
parameters menu.
ON
Threshold I3
Establishes the value that activates the protection.
The value is given as both absolute value (A) and relative value (In) and
can be set within the range: 1.5 In to 15 In, in 0.1 In steps
4 In
ZoneSelectivity
Activates/deactivates the function
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 OFF
StartUp enable
Activates/deactivates the function and availability of the associated
parameters on the display (page 77)
OFF
StartUp
Threshold
Protection threshold valid during Startup time, in the conditions in
which the function is activated (page 77)
The value is given as both absolute value (A) and relative value (In) and
can be set within the range: 1.5 In to 15 In, in 0.1 In steps
1,5 In
StartUp Time
This is the time for which the StartUp threshold remains activated and
is calculated from the moment the activation Threshold is exceeded
(page 77)
The value is given in seconds and can be set within the range: 0.1 s to
30 s, in 0.01 s steps
0.1 s
Ekip M Touch
With Ekip M Touch, I protection is inhibited for 100 ms if the currents detected by the Trip unit cross zero
when at least one is present (0.25 In fixed control threshold).
Limitations and additional functions
• threshold I3 must be higher than threshold I2 (if S and I protections are activated)
• I protection can be activated with MCR protection disabled
• the block functions can also be accessed by means of the service connector (via Ekip Connect) or
communication via system bus (page 78)