SMPPTRC (94) function for single-pole and two-pole tripping has additional phase segregated
inputs for this, as well as inputs for faulted phase selection. The latter inputs enable single- pole
and two-pole tripping for those functions which do not have their own phase selection capability,
and therefore which have just a single trip output and not phase segregated trip outputs for
routing through the phase segregated trip inputs of the expanded SMPPTRC (94) function.
Examples of such protection functions are the residual overcurrent protections. The expanded
SMPPTRC (94) function has two inputs for these functions, one for impedance tripping (for
example, carrier-aided tripping commands from the scheme communication logic), and one for
ground fault tripping (for example, tripping output from a residual overcurrent protection).
Additional logic, including a timer tWaitForPHS, secures a three-phase trip command for these
protection functions in the absence of the required phase selection signals.
The expanded SMPPTRC (94) function has three trip outputs TR_A, TR_B, TR_C (besides the trip
output TRIP), one per phase, for connection to one or more of the IEDs binary outputs, as well as
to other functions within the IED requiring these signals. There are also separate output signals
indicating single-pole, two-pole or three-pole trip. These signals are important for cooperation
with the autorecloser SMBRREC (79) function.
The expanded SMPPTRC (94) function is equipped with logic which secures correct operation for
evolving faults as well as for reclosing on to persistent faults. A special input is also provided
which disables single- pole and two-pole tripping, forcing all tripping to be three-pole.
In multi-breaker arrangements, one SMPPTRC (94) function block is used for each breaker. This
can be the case if single pole tripping and autoreclosing is used.
The breaker close lockout function can be activated from an external trip signal from another
protection function via input (SETLKOUT) or internally at a three-pole trip, if desired.
It is possible to lockout seal in the tripping output signals or use blocking of closing only the
choice is by setting
TripLockout.
15.1.6.1
Logic diagram
M12258-7 v5.1.1
TRINP_A
TRINP_B
TRINP_C
1PTRZ
1PTRGF
TRINP_3P
OR
OR
OR
Program = 3 phase
AND
INTL_ABCTRIP
ANSI05000517-3-en.vsd
ANSI05000517 V3 EN-US
Figure 483: Three-phase front logic — simplified logic diagram
Section 15
1MRK 502 066-UUS B
Logic
940
Technical manual
Содержание Relion 670 series
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