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Operation
Connections to Measuring Circuits 3
3-7
3-Wire Network with Two Current Sensors (ARON2 Method, Open Delta Method)
The conventional two-wattmeter method with current sensors at phases L1 and L3 is
frequently used in the medium voltage networks with built-in current and voltage
converters.
The device calculates IL2 = -IL1 - IL3. Two phase-to-phase voltages (U12, U32) are
measured. The third phase-to-phase voltage (U23) is calculated. The recorder then
transforms this delta system into a virtual Wye system by calculating virtual phase
voltages. This virtual Wye system is in turn used to calculate the power values of all three
phases as well as the total power. This method is only applicable, if I1+I2+I3 = 0, i.e. if
there is no neutral conductor.
Figure 3-3 shows the circuit diagram for 3-wire network with 2 current sensors (Aron
method), open delta method.
L1
L2
L3
CH1 = U12
CH3 = U32
CH5 = I1
CH7 = I3
L1
L2
L3
Fluke 1760
v-schaltung-3.eps
Figure 3-3. Circuit Diagram: Aron 2 Method/Open Delta Method
Associated PC Software Settings:
messsystem5 aron2.bmp
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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