ABB RELION RED670 Series Product Manual page 49

Line differential protection RED670 2.2
Product version: 2.2
based on the oil level in the oil insulated devices are used as
input signals to the function. In addition, the function
generates alarms based on the received information.
Circuit breaker condition monitoring SSCBR
The circuit breaker condition monitoring function (SSCBR) is
used to monitor different parameters of the breaker condition.
The breaker requires maintenance when the number of
operations reaches a predefined value. For a proper
functioning of the circuit breaker, it is essential to monitor the
circuit breaker operation, spring charge indication or breaker
wear, travel time, number of operation cycles and estimate
the accumulated energy during arcing periods.
Fault locator LMBRFLO
The accurate fault locator is an essential component to
minimize the outages after a persistent fault and/or to pin-
point a weak spot on the line.
The fault locator is an impedance measuring function giving
the distance to the fault in km, miles or % of line length. The
main advantage is the high accuracy achieved by
compensating for load current and for the mutual zero-
sequence effect on double circuit lines.
The compensation includes setting of the remote and local
sources and calculation of the distribution of fault currents
from each side. This distribution of fault current, together with
recorded load (pre-fault) currents, is used to exactly calculate
the fault position. The fault can be recalculated with new
source data at the actual fault to further increase the
accuracy.
Especially on heavily loaded long lines, where the source
voltage angles can be up to 35-40 degrees apart, the
accuracy can be still maintained with the advanced
compensation included in fault locator.
Event counter with limit supervison L4UFCNT
The Limit counter (L4UFCNT) provides a settable counter with
four independent limits where the number of positive and/or
negative flanks on the input signal are counted against the
setting values for limits. The output for each limit is activated
when the counted value reaches that limit.
Overflow indication is included for each up-counter.
Running hour-meter TEILGAPC
The Running hour-meter (TEILGAPC) function is a function
that accumulates the elapsed time when a given binary signal
has been high.
The main features of TEILGAPC are:
ABB
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M13970-3 v13
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GUID-464FB24F-B367-446C-963A-A14841943B87 v2
• Applicable to very long time accumulation (≤ 99999.9
hours)
• Supervision of limit transgression conditions and rollover/
overflow
• Possibility to define a warning and alarm with the
resolution of 0.1 hours
• Retain any saved accumulation value at a restart
• Possibilities for blocking and reset
• Possibility for manual addition of accumulated time
• Reporting of the accumulated time
16. Metering
Pulse-counter logic PCFCNT
Pulse-counter logic (PCFCNT) function counts externally
generated binary pulses, for instance pulses coming from an
external energy meter, for calculation of energy consumption
values. The pulses are captured by the binary input module
and then read by the PCFCNT function. A scaled service
value is available over the station bus. The special Binary
input module with enhanced pulse counting capabilities must
be ordered to achieve this functionality.
Function for energy calculation and demand handling
ETPMMTR
Power system measurement (CVMMXN) can be used to
measure active as well as reactive power values. Function for
energy calculation and demand handling (ETPMMTR) uses
measured active and reactive power as input and calculates
the accumulated active and reactive energy pulses, in forward
and reverse direction. Energy values can be read or
generated as pulses. Maximum demand power values are
also calculated by the function. This function includes zero
point clamping to remove noise from the input signal. As
output of this function: periodic energy calculations,
integration of energy values, calculation of energy pulses,
alarm signals for limit violation of energy values and maximum
power demand, can be found.
The values of active and reactive energies are calculated from
the input power values by integrating them over a selected
tEnergy . The integration of active and reactive energy
time
values will happen in both forward and reverse directions.
These energy values are available as output signals and also
as pulse outputs. Integration of energy values can be
controlled by inputs (STARTACC and STOPACC) and
setting and it can be reset to initial values with RSTACC
input.
The maximum demand for active and reactive powers are
calculated for the set time interval
are updated every minute through output channels. The
active and reactive maximum power demand values are
calculated for both forward and reverse direction and these
values can be reset with RSTDMD input.
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EnaAcc
tEnergy and these values
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