Hitachi Relion 670 Series Applications Manual page 338

Section 15
Monitoring
SetLEDN: Set red LED on local HMI in front of the IED if binary input N changes status.
Disturbance recorder
OperationM: Analog channel M is to be recorded by the disturbance recorder (On) or not (Off).
If OperationM = Off, no waveform (samples) will be recorded and reported in graph. However, Trip
value, pre-fault and fault value will be recorded and reported. The input channel can still be used to
trig the disturbance recorder.
If OperationM = On, waveform (samples) will also be recorded and reported in graph.
Setting information
SetInfoInDrep: Parameter used to enable or disable the settings information in disturbance header.
Event recorder
Event recorder (ER) function has no dedicated parameters.
Trip value recorder
ZeroAngleRef: The parameter defines which analog signal that will be used as phase angle
reference for all other analog input signals. This signal will also be used for frequency measurement
and the measured frequency is used when calculating trip values. It is suggested to point out a
sampled voltage input signal, for example, a line or busbar phase voltage (channel 1-30).
Event list
Event list (EL) (SOE) function has no dedicated parameters.
15.6.4.5 Consideration
The density of recording equipment in power systems is increasing, since the number of modern
IEDs, where recorders are included, is increasing. This leads to a vast number of recordings at every
single disturbance and a lot of information has to be handled if the recording functions do not have
proper settings. The goal is to optimize the settings in each IED to be able to capture just valuable
disturbances and to maximize the number that is possible to save in the IED.
The recording time should not be longer than necessary (PostFaultrecT and TimeLimit).
• Should the function record faults only for the protected object or cover more?
• How long is the longest expected fault clearing time?
• Is it necessary to include reclosure in the recording or should a persistent fault generate a
second recording (PostRetrig)?
Minimize the number of recordings:
• Binary signals: Use only relevant signals to start the recording that is, protection trip, carrier
receive and/or start signals.
• Analog signals: The level triggering should be used with great care, since unfortunate settings
will cause enormously number of recordings. If nevertheless analog input triggering is used,
chose settings by a sufficient margin from normal operation values. Phase voltages are not
recommended for trigging.
Remember that values of parameters set elsewhere are linked to the information on a report. Such
parameters are, for example, station and object identifiers, CT and VT ratios.
15.7 Logical signal status report BINSTATREP
332
There is a risk of flash wear out if the disturbance report triggers too often.
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