A070882-ANSI V2 EN
Figure 395: Functional module diagram
Timer
The duration of the TRIP output signal from 86/94 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, 86/94 has a
single input TRIP, through which all trip output signals are routed from the protection
functions within the protection relay, or from external protection functions via one or
more of the protection relay's binary inputs. The function has a single trip output TRIP for
connecting the function to one or more of the protection relay's binary outputs, and also to
other functions within the protection relay requiring this signal.
The BLOCK input blocks the TRIP output and resets the timer.
Lockout logic
86/94 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 684: Operation modes for the 86/94 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.
1MAC059074-MB A Section 5
Protection related functions
615 series ANSI 785
Technical Manual
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