__init__(self,
validity='QUESTIONABLE',
source='SUBSTITUTED',
failure=False,
suspect=False,
oldData=False,
badReference=False,
test=False,
outOfRange=False,
estimatorReplaced=False,
oscillatory=False,
operatorBlocked=False,
overFlow=False,
*args,
**kw_args)
(Constructor)
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Initialises a new 'Quality61850' instance.
- Parameters:
validity - Validity of the measurement value. Values are:
"QUESTIONABLE", "INVALID", "GOOD"source - Source gives information related to the origin of a value. The
value may be acquired from the process, defaulted or substituted.
Values are: "SUBSTITUTED", "DEFAULTED",
"PROCESS"failure - This identifier indicates that a supervision function has
detected an internal or external failure, e.g. communication
failure.suspect - A correlation function has detected that the value is not
consitent with other values. Typically set by a network State
Estimator.oldData - Measurement value is old and possibly invalid, as it has not been
successfully updated during a specified time interval.badReference - Measurement value may be incorrect due to a reference being out
of calibration.test - Measurement value is transmitted for test purposes.outOfRange - Measurement value is beyond a predefined range of value.estimatorReplaced - Value has been replaced by State Estimator. estimatorReplaced is
not an IEC61850 quality bit but has been put in this class for
convenience.oscillatory - To prevent some overload of the communication it is sensible to
detect and suppress oscillating (fast changing) binary inputs. If
a signal changes in a defined time (tosc) twice in the same
direction (from 0 to 1 or from 1 to 0) then oscillation is
detected and the detail quality identifier 'oscillatory' is set.
If it is detected a configured numbers of transient changes could
be passed by. In this time the validity status 'questionable' is
set. If after this defined numbers of changes the signal is still
in the oscillating state the value shall be set either to the
opposite state of the previous stable value or to a defined
default value. In this case the validity status 'questionable' is
reset and 'invalid' is set as long as the signal is oscillating.
If it is configured such that no transient changes should be
passed by then the validity status 'invalid' is set immediately
in addition to the detail quality identifier 'oscillatory' (used
for status information only).operatorBlocked - Measurement value is blocked and hence unavailable for
transmission.overFlow - Measurement value is beyond the capability of being represented
properly. For example, a counter value overflows from maximum
count back to a value of zero. - Overrides:
object.__init__
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