ABB Relion SMU615 Technical Manual page 126

Section 4
Protection related functions
120
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Figure 81: Functional module diagram
Timer
The duration of the TRIP output signal from TRPPTRC can be adjusted with the Trip
pulse time setting when the "Non-latched" operation mode is used. The pulse length
should be long enough to secure the opening of the breaker. For three-pole tripping,
TRPPTRC has a single input OPERATE, through which all trip output signals are
routed from the protection functions within the merging unit, or from external
protection functions via one or more of the merging unit's binary inputs. The function
has a single trip output TRIP for connecting the function to one or more of the
merging unit's binary outputs, and also to other functions within the merging unit
requiring this signal.
The BLOCK input blocks the TRIP output and resets the timer.
Lockout logic
TRPPTRC is provided with possibilities to activate a lockout. When activated, the
lockout can be manually reset after checking the primary fault by activating the
RST_LKOUT input or from the LHMI clear menu parameter. When using the
"Latched" mode, the resetting of the TRIP output can be done similarly as when using
the "Lockout" mode. It is also possible to reset the "Latched" mode remotely through
a separate communication parameter.
The minimum pulse trip function is not active when using the
"Lockout" or "Latched" modes but only when the "Non-latched"
mode is selected.
The CL_LKOUT and TRIP outputs can be blocked with the BLOCK input.
Table 163: Operation modes for the TRPPTRC trip output
Mode
Non-latched
Latched
Lockout
Operation
Trip pulse length parameter gives the
The
minimum pulse length for TRIP
TRIP is latched ; both local and remote clearing is
possible.
TRIP is locked and can be cleared only locally via
menu or the RST_LKOUT input.
1MRS758407 B
SMU615
Technical Manual