Metering - Hitachi Relion REL670 Product Manual

Line distance protection REL670
Version 2.2
Fault current and voltage monitoring FLTMMXU
The fault current and voltage monitoring function monitors
and reports the voltage and current values on occurrence of
a trip event.
FLTMMXU function monitors and reports the following
values:
• Maximum peak current of individual phases during the trip
event
• Maximum RMS current of individual phases during the trip
event
• Maximum RMS current of all phases during the trip event
• Fundamental DFT current magnitude and angle of
individual phases at the instant of triggering the function
via input TRIGFLUI
• Fundamental DFT neutral current magnitude and angle at
the instant of triggering the function via input TRIGFLUI
• Fundamental DFT voltage magnitude and angle of
individual phases at the instant of triggering the function
via input TRIGFLUI
• Fundamental DFT neutral voltage magnitude and angle at
the instant of triggering the function via input TRIGFLUI
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.

17. 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.
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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 time tEnergy. The integration of active and reactive
energy 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 EnaAcc 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 tEnergy and these values
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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