ABB 615 Series ANSI, Technical Manual

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Section 5
1MAC050144-MB C
Protection related functions
396 615 series ANSI
Technical Manual
Figure 194: Functional module diagram
Timer
The user can adjust the duration of a trip output signal from the 86/94 function with the
Trip pulse time setting. 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 IED, or from external
protection functions via one or more of the IED's binary inputs. The function has a single
trip output
CB TRIP
for connecting the function to one or more of the IED's binary
outputs, as well as to other functions within the IED requiring this signal.
The
BLOCK
input blocks the
CB TRIP
output and resets the timer.
Lockout logic
The user can select the behavior of 86/94 in trip situation with the Trip output mode setting.
The user can select between three different modes: "Non-latched", "Latched" and
"Lockout". When using the "Latched" mode, the
RST_LKOUT
input can be used to reset
the
CB TRIP
output. The output can be reset also via communication or LHMI. The
CL_LKOUT
output is activated only in the "Lockout" mode.
The
CL_LKOUT
can be blocked with the
BLOCK
input.
Table 345: Operation modes for the 86/94 trip output
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.
Mode Operation
Non-latched The
Trip pulse length
parameter gives the minimum
pulse length for the
CB TRIP
Latched The
CB TRIP
is latched ; both local and remote
clearing is possible.
Lockout The
CB TRIP
is locked and can be cleared only
locally via menu or the
RST_LKOUT
input.