single trip output TRIP for connecting the function to one or more of the IED's
binary outputs, and also to other functions within the IED 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 470: Operation modes for the TRPPTRC trip output
Mode
Operation
Non-latched The
Trip pulse length
parameter gives the
minimum pulse length for TRIP
Latched TRIP is latched ; both local and remote clearing
is possible.
Lockout TRIP is locked and can be cleared only locally
via menu or the RST_LKOUT input.
5.3.5 Application
All trip signals from different protection functions are routed through the trip logic.
The most simplified application of the logic function is linking the trip signal and
ensuring that the signal is long enough.
The tripping logic in the protection relay is intended to be used in the three-phase
tripping for all fault types (3ph operating). To prevent the closing of a circuit
breaker after a trip, TRPPTRC can block the CBXCBR closing.
TRPPTRC is intended to be connected to one trip coil of the corresponding circuit
breaker. If tripping is needed for another trip coil or another circuit breaker which
needs, for example, different trip pulse time, another trip logic function can be
used. The two instances of the PTRC function are identical, only the names of the
functions, TRPPTRC1 and TRPPTRC2, are different. Therefore, even if all
references are made only to TRPPTRC1, they also apply to TRPPTRC2.
1YHT530004D05 D Section 5
Protection related functions
615 series 553
Technical Manual
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