and re-closing during certain conditions, but naturally, it can
not fully replace a communication channel.
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
M13918-4 v10
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
M13928-3 v7
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.
M13928-6 v2
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.
M13928-8 v5
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.
11. Logic
Tripping logic SMPPTRC
M12275-3 v10
A function block for protection tripping is always provided as
basic for each circuit breaker involved in the tripping of the
fault. It provides a settable pulse prolongation 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 also includes a settable latch
functionality for evolving faults and breaker lock-out.
Trip matrix logic TMAGAPC
M15321-3 v11
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
GUID-16E60E27-F7A8-416D-8648-8174AAC49BB5 v3
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
GUID-F7D9A012-3AD4-4D86-BE97-DF2A99BE5383 v3
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
GUID-D8D1A4EE-A87F-46C6-8529-277FC1ADA9B0 v3
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
M11396-4 v15
The basic configurable logic blocks do not propagate the time
stamp and quality of signals (have no suffix QT at the end of
their function name). A number of logic blocks and timers are
always available as basic for the user to adapt the
configuration to the specific application needs. The list below
shows a summary of the function blocks and their features.
These logic blocks are also available as part of an extension
logic package with the same number of instances.
• AND function block. Each block has four inputs and two
outputs where one is inverted.
• GATE function block is used for whether or not a signal
should be able to pass from the input to the output.
1MRK 511 361-BEN B
Bay control REC670 2.1 IEC
Product version: 2.1
26
ABB
Summary of Contents for REC670 2.1 IEC
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