Logic - ABB Relion REL650 Series Product Manual

Line distance protection REL650
Version 2.2
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 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.
Hitachi Power Grids

11. Logic

M13918-4 v11
Tripping logic common 3-phase output 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 three-phase 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 output signal
(STDIR) to be connected to the Trip function.
The purpose of this functionality is to provide general start
M13928-3 v8
and directional information for the IEC 61850 trip logic data
model SMPPTRC.
Trip matrix logic TMAGAPC
The 12 Trip matrix logic (TMAGAPC) function each with 32
inputs are used to route trip signals and other logical output
signals to the tripping logics SMPPTRC and SPTPTRC or 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
M13928-6 v2
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
M13928-8 v5
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.
Basic configurable logic blocks
The basic configurable logic blocks do not propagate the
time stamp and quality of signals. The list below shows a
summary of the function blocks and their features.
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1MRK 506 384-BEN H
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
M11396-4 v20
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