ABB SACE Tmax XT5 Operation And Maintenance Manual page 66

UP Protection
t
P23
t23
RQ Protection Function
64 | © 2019 ABB | 1SDH002039A1002 - ECN000093027 - Rev. A
Function
The protection sends a TRIP command if one or more of the active power values detected by the unit drop
below threshold P23 for longer than t23.
UP
The protection is active also for negative (reverse) active power, but is independent from the RP protection
(protection against reverse active power).
The protection excludes itself if the maximum value of the line-to-line voltage is less than 30 V.
To check and simulate the trip times in relation to all the parameters, please consult:
P
• summary table of the protections with the operating characteristics (page 80)
• the graph with trip curve (page 94)
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as
information
Establishes the value that activates the protection.
Threshold P23 The value is given as both absolute value (kW) and relative value (Sn)
and can be set within the range: 0.1 Sn to 1 Sn in 0.001 Sn steps
This is the trip time of the protection; the value is given in seconds and
Time t23
can be set within a range: 0.5 s to 100 s, in 0.5 s steps
Activates/deactivates the function and availability of the StartUp Time
StartUp enable
parameter in the menu
This is the time for which the threshold remains disabled and is
calculated from the moment the activation Threshold is exceeded
StartUp Time
The value is given in seconds and can be set within the range: 0.1 s to
30 s, in 0.01 s steps
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 75).
RQ protection protects against reactive power reversal; the threshold can be adjusted on the basis of the
active power.
The protection sends a TRIP command when inverse reactive power enters the TRIP area, determined by the
protection parameters and power value readings, for longer than t24.
Adjustment of constants Kq and Kq2 allows the trip threshold of the protection (determined by the intersection
of the two TRIP areas, whose limits depend on the parameters configured in the unit) to be changed.
Figure 30
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 80)
• the graph with trip curve (page 94)
Q
kq2 kq
Q24
TRIP
Q25
ABB | SACE Tmax XT
Default
OFF
OFF
1 Sn
1 s
OFF
0.1 s
P
Continued on the next page
Protections | 5 - Power protections