ABB RET670 - Page 793

If OperationM = Disabled, 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 = Enabled, waveform (samples) will also be recorded and reported in
graph.
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).
Sequential of events
function has no dedicated parameters.
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 pickup 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.
1MRK504116-UUS C Section 3
IED application
787
Application manual