88
9.7.1.5. 3-wire ARON connection
3 wire asymmetrical (VDE) 2 x VT and 2 x CT ARON configuration
Meter configured for 4 wire, 3 element metrology
Terminal Phase Function Link to Terminal Phase Function Link to
1 1 I1 - CT1 in 7 3 I3- CT2 in
2 1 U1 - VT1 in 8 3 U3 - VT2 in
3
I1 - common I2 and I3 9
I3 - common I1 and I2
4
I2 - CT1 / CT2 out
common
11 Un No connection
5
U2 - VT common
6
I2 - common I1 and I3
The Un connection (terminal 11) remains unconnected. Do NOT connect it to ground.
The two current circuit neutral returns are connected in the reverse direction via the missing current circuit.
The wiring diagram is correct if there is no homopolar current (I1+I2+I3=0) in the three-phase network.
Typical wiring illustrated below:
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