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9.3. ELECTRICAL NETWORKS ALLOWED
The following types of distribution network are managed:
Distribution
network Abbreviation Phase
order Remarks Reference
diagram
Single-phase
(single-phase
2-wire)
1P- 2W No The voltage is measured between L1 and N.
The current is measured on the L1 conductor. See § 4.1.1.
Two-phase
(split-phase
single-phase
3-wire)
1P-3W No
The voltage is measured between L1, L2 and N.
The current is measured on the L1 and L2 conductors.
The neutral current is calculated: iN = i1 + i2
See § 4.1.2.
Three-phase,
3-wire D
[2 current sensors]
3P-3WD2
Yes
The power measurement method is based on the two-
wattmeter method with a virtual neutral.
The voltage is measured between L1, L2 and L3.
The current is measured on the L1 and L3 conductors. The
current I2 is calculated (no current sensor on L2): i2 = -i1 -i3
The neutral is not available for the measurement of the
current and of the voltage
See § 4.1.3.1.
Three-phase,
3-wire open D
(2 current sen-
sors)
3P-3WO2 See § 4.1.3.3.
Three-phase
3-wire wye
[2 current sensors]
3P-3WY2 See § 4.1.3.5.
Three-phase,
3-wire D (3 current
sensors) 3P-3WD3
Yes
The power measurement is based on the three-wattmeter
method with a virtual neutral.
The voltage is measured between L1, L2 and L3.
The current is measured on the L1, L2 and L3 conductors.
The neutral is not available for the measurement of the
current and of the voltage
See § 4.1.3.2.
Three-phase,
3-wire open
D (3 current
sensors)
3P-3WO3 See § 4.1.3.4.
Three-phase,
3-wire, wye [3
current sensors]
3P-3WY3 See § 4.1.3.6.
Three-phase,
3-wire D, balanced 3P-3WDB No
The power measurement is based on the one-wattmeter
method.
The voltage is measured between L1 and L2.
The current is measured on the L3 conductor.
U23 = U31 = U12.
I1 = I2 = I3
See § 4.1.3.7.
Three-phase
4-wire wye 3P-4WY Yes
The power measurement is based on the three-wattmeter
method with neutral.
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: iN = i1 + i2 + i3.
See § 4.1.4.1.
Three-phase,
4-wire, wye,
balanced
3P-4WYB No
The power measurement is based on the one-wattmeter
method.
The voltage is measured between L1 and N.
The current is measured on the L1 conductor.
V1 = V2 = V3
U23 = U31 = U12= V13.
I1 = I2 = I3
IN = 3 x I1
See § 4.1.4.2.
Three-phase,
3-wire, wye 2½ 3P-4WY2 Yes
This method is called the 2½-element method
The power measurement is based on the three-wattmeter
method with a virtual neutral.
The voltage is measured between L1, L3 and N.
V2 is calculated: v2 = - v1 - v3, u12 = 2v1 + v3,
u23= - v1 - 2v3. V2 is assumed to be balanced.
The current is measured on the L1, L2 and L3 conductors.
The neutral current is calculated: iN = i1 + i2 + i3.
See § 4.1.4.3.
70


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