ABB REL650 Product Manual page 21

Line distance protection REL650 2.2
Product version: 2.2.1
signal to the remote end, and to block the permissive tripping
at the local end. This blocking condition is maintained long
enough to ensure that no unwanted operation will occur as a
result of the current reversal.
On verification of a weak end infeed condition, the weak end
infeed logic provides an output for sending the received
teleprotection signal back to the remote sending end and
other output(s) for local tripping. For terminals equipped for
single- and two-pole tripping, outputs for the faulted phase(s)
are provided. Undervoltage detectors are used to detect the
faulted phase(s).
Local acceleration logic ZCLCPSCH
To achieve fast clearing of faults on the whole line, when no
communication channel is available, local acceleration logic
(ZCLCPSCH) can be used. This logic enables fast fault
clearing 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
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.
ABB
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
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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.
10. Logic
Tripping logic SMPPTRC
A function block for protection tripping and general start
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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 output signal (
connected to the Trip function.
The purpose of this functionality is to provide general start
and directional information for the IEC 61850 trip logic data
model SMPPTRC.
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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
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