ABB Relion REG670, Technical Manual

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inputs enable single- phase and two-phase 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 function. Examples of such protection
functions are the residual overcurrent protections. The expanded SMPPTRC 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 earth
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 function has three trip outputs TRL1, TRL2, TRL3 (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-phase, two-phase or three-phase trip.
These signals are important for cooperation with the autorecloser SMBRREC
function.
The expanded SMPPTRC 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- phase and two-phase tripping, forcing all
tripping to be three-phase.
In multi-breaker arrangements, one SMPPTRC 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-phase 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
TRINL1
TRINL2
TRINL3
1PTRZ
1PTREF
TRIN
OR
OR
OR
Program = 3 phase
AND
RSTTRIP
IEC05000517-3-en.vsd
IEC05000517 V3 EN
Figure 368: Three-phase front logic — simplified logic diagram
Section 15
1MRK502052-UEN B
Logic
794
Technical manual