5.5 Δ-YConversion Function
98
For 3P3W3M wiring systems (wiring mode 7 on p.33), Δ (Delta) wiring configuration values are converted to
Y (Wye) wiring values ('star' configuration) so that measured values are equivalent to those of 3P4W lines.
When this function is enabled, even when a motor has internal Wye wiring and the central (neutral) point
is inaccessible, it can be measured using phase voltage to emulate the Wye configuration.
Δ-Y conversion analyzes voltage waveforms after performing vector conversion using a virtual neutral.
Although voltage waveforms, voltage measurement values, and harmonic voltages are all input as line
voltages, they are calculated as phase voltages.
Illustration of
Δ-Y conversion
5.5 Δ-YConversion Function
Setting Procedure
Display the
[Input] page
Use F keys to select
Select [Δ -Yconvert]
The Measurement screen appears as follows.
• When auto-ranging voltage and Δ-Y conversion are enabled, the range-switching level for the next
lower range is calculated to be
• Δ-Y conversion is only selectable for 3P3W3M wiring.
• When
Δ-Y conversion is enabled, the vector diagram on the Wiring screen is the same as
that for 3P4W (instead of the 3P3W3M vector diagram).
13⁄
See "Auto-Ranging Span" (p. 46)
times (approx. 0.57735 times) the full-scale range value.
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