Page 61 - MCCB-XT2-XT4

ABB | SACE Tmax XT

UP Protection Function
The protection sends a TRIP command if one or more of the active power values detected by the unit drop
t below threshold P23 for longer than t23.
UP
P23 The protection is active also for negative (reverse) active power, but is independent from the RP protection
(Reverse active power protection).
t23 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 76)
• the graph with trip curve (page 91)
Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu
Activates/deactivates transmission of the open command: if
Trip Enable disabled, the alarm and exceedance of protection time are only OFF
managed as information
Establishes the value that activates the protection.
The value is given as both absolute value (kW) and relative value
Threshold P23 1 Sn
(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
Time t23 seconds and can be set within a range: 0.5 s to 100 s, in 0.5 s 1 s
steps
Activates/deactivates the function and availability of the StartUp
StartUp enable OFF
Time 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 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
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 70).

RQ Protection Function
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.
Q

Kq2 Kq
P

Q24 TRIP

Q25

Figure 21

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 76)
• the graph with trip curve (page 91)

Continued on the next page

59 | © 2022 ABB | 1SDH002031A1002 - ECN000212994 Protections | 6 - Power protections