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Distribution
system Abbreviation Phase
order Comments Reference
diagram
Single phase
(1-Phase 2-Wire) 1P- 2W No Voltage measurements are made between L1 and N.
Current measurements are made on the L1 conductor. see § 3.4.1
Dual phase
(1-Phase 3-Wire) 1P-3W No
Voltage measurements are made between L1, L2
and N.
Current measurements are made on the L1 and L2
conductors.
The neutral current is calculated: iN = i1 + i2
see § 3.4.2
3-Phase 3-Wire
[2 current sensors] 3P-3W2
Yes
The power measurement is made by the 2-wattmeter
method with virtual neutral.
Voltage measurements are made between L1, L2
and L3.
Current measurements are made on the L1 and L3
conductors. The I2 current is calculated (no current sensor
connected on L2): i2 = - i1 - i3
The neutral is not available for the current and voltage
measurements
see § 3.4.3.1
3-Phase 3-Wire
Open
[2 current sensors]
3P-3WO2 see § 3.4.3.3
3-Phase 3-Wire Y
[2 current sensors] 3P-3WY2 see § 3.4.3.5
3-Phase 3-Wire
[3 current sensors] 3P-3W3
Yes
The power measurement method is made by the 3
wattmeter method with virtual neutral.
Voltage measurements are made between L1, L2 and L3.
Current measurements are made on the L1, L2 and L3
conductors.
The neutral is not available for the current and voltage
measurements
see § 3.4.3.2
3-Phase 3-Wire
Open
[3 current sensors]
3P-3WO3 see § 3.4.3.4
3-Phase 3-Wire Y
[3 current sensors] 3P-3WY3 see § 3.4.3.6
3-Phase 3-Wire
balanced 3P-3WB No
The power measurement is made by the 1-wattmeter
method.
Voltage measurements are made between L1 and L2.
Current measurements are made on L3 conductor.
U23 = U31 = U12.
I1 = I2 = I3
see § 3.4.3.7
3-Phase 4-Wire Y 3P-4WY Yes
The power measurement method is made by the
3-wattmeter method with neutral.
Voltage measurements are made between L1, L2 and L3.
Current measurements are made on the L1, L2 and L3
conductors.
The neutral current is calculated: iN = i1 + i2 + i3.
see § 3.4.4.1
3-Phase 4-Wire Y
balanced 3P-4WYB No
The power measurement is made by the single phase
wattmeter method.
Voltage measurements are made between L1 and N.
Current measurements are made on the L1 conductor.
V1 = V2 = V3
3.
I1 = I2 = I3
see § 3.4.4.2
3-Phase 4-Wire
Y 2½ 3P-4WY2 Yes
This method is called the 2½ element method.
The power measurement method is made by the 3
wattmeter method with virtual neutral.
Voltage measurements are made between L1, L3 and N.
V2 is calculated: v2 = - v1 - v3, u12 = 2v1 + v3,
u23= - v1 - 2v3. V2 is assumed to be balanced.
Current measurements are made on the L1, L2 and L3
conductors.
The neutral current is calculated: iN = i1 + i2+i3
see § 3.4.4.3
74


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