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Distribution
network Abbreviation Phase
order Remarks Reference
diagram
Three-phase,
4-wire D3P-4WD
No
The power measurement is based on the three-wattmeter
method with neutral, but no power information is available
for the individual phases.
The voltage is measured between L1, L2 and L3.
The current is measured on the L1, L2 and L3 conductors.
The neutral current is calculated for only one branch of the
transformer: iN = i1 + i2 + i3 .
See § 4.1.5.1.
Three-phase,
4-wire, open D3P-4WODSee § 4.1.5.2.
DC 2-wire DC-2W No The voltage is measured between L1 and N.
The current is measured on the L1 conductor. See § 4.1.6.1.
DC 3-wire DC-3W No
The voltage is measured between L1, L2 and N.
The current is measured on the L1 and L2 conductors.
The negative (return) current is calculated: iN = i1 + i2 .
See § 4.1.6.2.
DC 4-wire DC-4W No
The voltage is measured between L1, L2, L3 and N.
The current is measured on the L1, L2 and L3 conductors.
The negative (return) current is calculated: iN = i1 + i2 + i3 .
See § 4.1.6.3.
Table 23
9.4. QUANTITY ACCORDING TO THE DISTRIBUTION NETWORK
= Yes = No
Quantities 1P-2W 1P-3W
3P-3W∆2
3P-3WO2
3P-3WY2
3P-3W∆3
3P-3WO3
3P-3WY3
3P-3W∆B 3P-4WY 3P-4WYB 3P-4WY2 3P-4W∆
3P-4WO∆ DC-2W DC-3W DC-4W
V1
AC
RMS
V2
AC
RMS = V1(10)
V3
AC
RMS = V1
VNE
AC
RMS
V1DC 
V2DC
V3DC
VNE DC
V1
AC +
DC
RMS
V2
AC +
DC
RMS
(1) (10)
V3
AC +
DC
RMS
(1)
VNE
AC +
DC
RMS
U12
AC
RMS (1) (10)
U23
AC
RMS (1) (1) (10)
U31
AC
RMS (1) (1)
I1
AC
RMS 
I2
AC
RMS (2) (1) (1)
I3
AC
RMS (1) (1)
IN
AC
RMS
I1DC 
I2DC
71


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