ABB XT7, Руководство по эксплуатации и обслуживанию

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ABB | SACE Tmax XT
Protections | 7 - Standard Protections 49 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
Continued from the previous page
Ekip M Touch
With Ekip M Touch, G protection features the following differences compared to the other models:
• Block BlockOnStartup enabled and non-editable (page 78)
•
StartUp Time
non-editable and set with the Motor start-up value, depending on the trip class (page 130)
• curve set as t=k, non-editable
Limitations and additional functions
• in the presence of curve t= k/I
2
, the protection trip time is forced to t4 if the calculation results give a
theoretical value lower than t4 itself
• in the absence of Vaux, the minimum threshold is 0.2 In; if lower values are set, the Trip unit forces the
threshold to the minimum admissible value and the "
Configuration
" error appears
• depending on the I4 threshold setting, the protection deactivates for an Ig higher than: 8 In with threshold
I4 ≥ 0.8 In; 6 In with 0.8 In > I4 ≥ 0.5 In; 4 In with 0,5 In > I4 ≥ 0,2 In; 2 In with I4 > 0.2 In
• operation with t4 = instantaneous requires the presence of Vaux; in self-supply, the Trip unit forces the
time to 100 ms and the "Configuration" error appears
• 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 75)
• with CB in UL standard configuration, some parameters have different maximum values: I4 maximum =
1200A, Startup maximum = 1200A, t4 maximum = 400ms
Protection MCR
I3
t
I
MCR
Function
The protection remains activated for a time interval running from the open - closed change of status of the
CB, after which it deactivates.
If, during this time interval, the current of one or more phases exceeds threshold I3, the protection transmits
the TRIP command after a non-programmable fixed time.
The MCR protection only functions with Vaux.
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)
NOTE: to activate MCR, protection I must be disabled
Parameter Description Default
Enable
Activates/deactivates the protection and its availability in the
parameters menu.
OFF
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
6 In
Monitor Time
Defines the time interval in which the MCR protection remains
activated, as calculated from the open - closed change of status
The value is given in seconds and can be set within the range: 0.04 s
to 0.5 s, in 0.01 s steps
0,04 s
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
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or
communication via system bus (page 75)