The description text for 'AvPhVPhs' goes
"Arithmetic average of the magnitude of phase to reference voltage of the 3 phases: average(PhVa, PhVb, PhVc)."
A "reference voltage" is mentioned - which does not exist in this context.
Proposal
Propose to change the text to
Arithmetic average of the magnitude of phase voltages of the 3 phases: average(PhVa, PhVb, PhVc)."
On this occasion: Please check whether "PhVa" (phase A in lower case) and others comply with our convention.
There are multiple occurrences in various description texts in MMXU LN class.
Discussion
Created
Status
One small grammatical suggestion: Arithmetic average of the magnitude of the 3 individual phase voltages: average(PhVa, PhVb, PhVc).
07 Jul 26
Discussion (red)
open for discussion.
07 Jul 26
Discussion (red)
change state to "accepted"
07 Jul 26
Accepted
Agree, it seems as if "the magnitude of phase to ground voltages of the 3 phases" was intended.
The calculation for 'AvPhVPhs' is something like
(PhV.phsA.cVal.mag+PhV.phsB.cVal.mag+PhV.phsC.cVal.mag)/3
which is again a magnitude in primary voltage.
A reference voltage is not needed.
If the term "reference" voltage was used to keep the wording applicable for all kinds of network starpoint treatment, then the term "reference" is not OK, for it is not a voltage. "Reference voltage" is used with synchronism checking.
22 Jun 26
Triage
Similar comments apply to MinPhVPhs and MaxPhVPhs
My interpretation (guess!) is that "reference voltage" was intended to mean one of "Phase to ground" or "Phase to neutral".
However, the DO name and the example imply the reference is always ground. The name is consistent with PhV Phase to ground (line) voltages.
Alternative proposals:
Option a:
Change text to "Arithmetic average of the magnitude of the 3 phase voltages. These may be either phase to ground voltages: average(PhV.phsA, PhV,phsB, PhV.phsC) or phase to neutral voltages: average(PNV.phsA, PNV.phsB, PNV.phsC). The reference used should be provided in the IED documentation.
Option b:
Change text as proposed and similarly for MinPhvPhs and MaxPhvPhs.
Raise a redmine issue to add new data objects AvPNVPhs, MinPNVPhs, MaxPNVPhs consistent with PNV Phase to neutral voltages.