Electrical Signal Processing - Hitachi Relion 650 Series Technical Manual

Section 12
Monitoring
Input Name
INPRIOPX
INNOOPLX
INNCOPLX
All these data are provided to the other subfunctions of ACBMSCBR as needed.
12.18.7.3

Electrical signal processing

The electrical three-phase signals to be considered as inputs for the functionality are:
Table 265: Three-phase electrical primary signal
Input Name
U3PL
I3PL
The PhaseIdentifier setting determines which of the phases in the three-phase group signals is
actually evaluated in each function instance. The electrical primary signal to be used for monitoring of
CB Close and Open operations is selected by the setting FeedbackSigC and FeedbackSigO
respectively. The corresponding global base value is fetched from a specified GBASVAL instance,
see Table
Table 266: Selection of feedback signal and base value
Setting
FeedbackSigC
FeedbackSigO
GlobalBaseSel
ScaleFactorV
For the selected electrical feedback signal (I3P or U3PL), the RMS value is compared with a
threshold value deduced from the settings CloseCThreshold and OpenCThreshold, as detailed in
Table 267. The signal is considered healthy if the RMS of the signal in this phase is greater than both
the CloseCThreshold and OpenCThreshold thresholds. Healthy feedback signal is further interpreted
as the breaker being electrically closed.
Table 267: Dead value settings
Setting
CloseCThreshold
OpenCThreshold
Apart from the electrical feedback signals, the function also receives zero crossing time stamps,
average half cycle times and voltage peaks from ANSGPROC function. The processed reference
signal (source voltage) is received at the REFIN input and the healthiness evaluation at the VREFOK
input.
276
Information received
Average time (in milliseconds) from trip command to main contact separation.
Average time (in milliseconds) from trip command to NO (52a) auxiliary contact open.
Average time (in milliseconds) from trip command to NC (52b) auxiliary contact close.
Information received
RMS and signal samples of three-phase load voltage
RMS and signal samples of three-phase load current
266.
Description
Selected electrical feedback signal (CB current or load voltage) for close operations.
Selected electrical feedback signal (CB current or load voltage) for open operations.
Selection of GBASVAL function instance from which UBase and IBase are taken.
Scaling factor for UBase in load voltage signal evaluation.
Description
Threshold level for the selected electrical feedback signal, in percent of global base value
and scaling factor of UBase, to eliminate unwanted signals during breaker closing.
For example, FeedbackSigC="Voltage" CloseCThreshold = 5%
CloseCThreshold (absolutevalue) = 5% of UBase * ScaleFactorV
Threshold level for the selected electrical feedback signal, in percent of global base value
and scaling factor of UBase, to eliminate unwanted signals during breaker opening.
For example, FeedbackSig="Current"
OpenCThreshold =5%
OpenCThreshold(absolutevalue) = 5% of IBase
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