• 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
M13970-3 v13
The Fault locator (LMBRFLO) in the IED is an essential
complement to other monitoring functions, since it measures
and indicates the distance to the fault with great accuracy. It
indicates the distance to fault in kilometers or miles as
selected by parameter setting.
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.
13. Metering
Pulse-counter logic PCFCNT
M13394-3 v7
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 BIO
(binary input/output) module and then read by the PCFCNT
function. A scaled service value is available over the station
bus.
Function for energy calculation and demand handling
ETPMMTR
GUID-6898E29B-DA70-421C-837C-1BBED8C63A7A v3
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.
14. Human machine interface
Local HMI
AMU0600442 v15
The LHMI of the IED contains the following elements
• Graphical display capable of showing a user defined
single line diagram and provide an interface for controlling
switchgear.
• Navigation buttons and five user defined command
buttons to shortcuts in the HMI tree or simple commands.
• 15 user defined three-color LEDs.
• Communication port for PCM600.
The LHMI is used for setting, monitoring and controlling.
15. Basic IED functions
Time synchronization
M11344-3 v12
The time synchronization function is used to select a
common source of absolute time for the synchronization of
the IED when it is a part of a protection system. This makes
it possible to compare events and disturbance data between
all IEDs within a station automation system and in between
sub-stations. A common source shall be used for IED and
merging unit when IEC/UCA 61850-9-2LE process bus
communication is used.
Line distance protection REL650
1MRK 506 384-BEN H
Version 2.2
34
Hitachi Power Grids
© 2017 - 2021 Hitachi Power Grids. All rights reserved
Содержание REL650 A11
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