Page 66 - MCCB-XT5

ABB | SACE Tmax XT

OQ Protection Function
The protection sends a TRIP command if one or more of the reactive power values detected by the unit
t exceed threshold Q27 for longer than t27.
Q27 OQ 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 82)
t27 • the graph with trip curve (page 96)
Parameters
Q 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 (kVAR) and relative value
Threshold Q27 1 Sn
(Sn) and can be set within the range: 0.4 Sn to 2 Sn in 0.001 Sn
steps
This is the trip time of the protection; the value is given in
Time t27 seconds and can be set within a range: 0.5 s to 100 s, in 0.5 s 1 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 76).

OP Protection Function
The protection sends a TRIP command if one or more of the active power values detected by the unit
t exceed threshold P26 for longer than t26.
P26 OP 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 82)
t26 • the graph with trip curve (page 96)
Parameters
P 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 P26 1 Un
(Sn) and can be set within the range: 0.4 Sn to 2 Sn in 0.001 Sn
steps
This is the trip time of the protection; the value is given in
Time t26 seconds and can be set within a range: 0.5 s to 100 s, in 0.5 s 1 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 76).

64 | © 2022 ABB | 1SDH002039A1002 - ECN000212994 Protections | 6 - Power protections