Logic - ABB Relion 670 Series Product Manual

Bay control REC670
Version 2.2
The logic can be controlled either by the autorecloser
(zone extension) or by the loss-of-load current (loss-of-
load acceleration).
Scheme communication logic for residual
overcurrent protection ECPSCH
To achieve fast fault clearance of earth faults on the
part of the line not covered by the instantaneous step of
the residual overcurrent protection, the directional
residual overcurrent protection can be supported with a
logic that uses communication channels.
In the directional scheme, information of the fault
current direction must be transmitted to the other line
end. With directional comparison, a short operate time
of the protection including a channel transmission time,
can be achieved. This short operate time enables rapid
autoreclosing function after the fault clearance.
The communication logic module for directional residual
current protection enables blocking as well as
permissive under/overreaching, and unblocking
schemes. The logic can also be supported by additional
logic for weak-end infeed and current reversal, included
in Current reversal and weak-end infeed logic for
residual overcurrent protection (ECRWPSCH) function.
Current reversal and weak-end infeed logic for
residual overcurrent protection ECRWPSCH
The Current reversal and weak-end infeed logic for
residual overcurrent protection (ECRWPSCH) is a
supplement to Scheme communication logic for residual
overcurrent protection ECPSCH.
To achieve fast fault clearing for all earth faults on the
line, the directional earth fault protection function can
be supported with logic that uses tele-protection
channels.
This is why the IEDs have available additions to the
scheme communication logic.
If parallel lines are connected to common busbars at
both terminals, overreaching permissive communication
schemes can trip unselectively due to fault current
reversal. This unwanted tripping affects the healthy line
when a fault is cleared on the other line. This lack of
security can result in a total loss of interconnection
between the two buses. To avoid this type of
disturbance, a fault current reversal logic (transient
blocking logic) can be used.
Permissive communication schemes for residual
overcurrent protection can basically operate only when
the protection in the remote IED can detect the fault.
The detection requires a sufficient minimum residual
fault current, out from this IED. The fault current can be
too low due to an opened breaker or high-positive
and/or zero-sequence source impedance behind this
Hitachi Power Grids
M13918-4 v11
M13928-3 v8
M13928-6 v2
M13928-8 v5
© Copyright 2017 Hitachi Power Grids. All rights reserved
IED. To overcome these conditions, weak-end infeed
(WEI) echo logic is used. The weak-end infeed echo is
limited to 200 ms to avoid channel lockup.

16. Logic

Tripping logic SMPPTRC
A function block for protection tripping and general
start indication is always provided as a basic function
for each circuit breaker. It provides a settable pulse
prolongation time to ensure a trip pulse of sufficient
length, as well as all functionality necessary for correct
co-operation with autoreclosing functions.
The trip function block includes a settable latch function
for the trip signal and circuit breaker lockout.
The trip function can collect start and directional signals
from different application functions. The aggregated
start and directional signals are mapped to the IEC
61850 logical node data model.
General start matrix block SMAGAPC
The Start Matrix (SMAGAPC) merges start and
directional output signals from different application
functions and creates a common start and directional
STDIR ) to be connected to the Trip
output signal (
function.
The purpose of this functionality is to provide general
start and directional information for the IEC 61850 trip
logic data model SMPPTRC.
Trip matrix logic TMAGAPC
The trip matrix logic (TMAGAPC) function is used to
route trip signals and other logical output signals to
different output contacts on the IED.
The trip matrix logic function has 3 output signals and
these outputs can be connected to physical tripping
outputs according to the specific application needs for
settable pulse or steady output.
Group alarm logic function ALMCALH
The group alarm logic function (ALMCALH) is used to
route several alarm signals to a common indication, LED
and/or contact, in the IED.
Group warning logic function WRNCALH
The group warning logic function (WRNCALH) is used to
route several warning signals to a common indication,
LED and/or contact, in the IED.
Group indication logic function INDCALH
The group indication logic function (INDCALH) is used to
route several indication signals to a common indication,
LED and/or contact, in the IED.
1MRK 511 404-BEN N
M12275-3 v15
GUID-BA516165-96DE-4CD9-979B-29457C7653C0 v3
M15321-3 v14
GUID-16E60E27-F7A8-416D-8648-8174AAC49BB5 v4
GUID-F7D9A012-3AD4-4D86-BE97-DF2A99BE5383 v4
GUID-D8D1A4EE-A87F-46C6-8529-277FC1ADA9B0 v4
39