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Explanation of Voltage and Current Input Wiring Diagram for ION8600 Form 35 and 35S, 4-Wire WYE, 2 PTs, 3 CTs

Goals and Symptoms

***This configuration can affect some of the meter’s parameter calculations. Contact Schneider Electric for details.***
This configuration will work for measuring total power. When an ION8600 series meter is applied in this way, some of the many parameters that are provided appear to be calculated incorrectly because of the way the Volts Mode works.

Please note: The following setup does not work for unbalanced systems.

Causes and Fixes

1) Phase to Neutral Voltages
Will not be displayed, because DELTA mode does not display line-to-neutral voltages.

2) Phase to Phase Voltages
Vab and Vbcwill display phase to neutral voltages. Vca will correctly show the phase-to-phase voltage. Vll avg will be incorrect.

3) Current
Since the CT secondary windings are delta connected, the displayed Ib value is ?(3) * ?(3) or 3 times larger than Ia and Ic. Where Ia = ?(3)I1 AND Ic = ?(3)I3 and the I1 and I3 are currents in the primary.

4) Real Power
The kW total will be correct.

5) Reactive Power
The kVAr total will be correct.

6) Apparent Power
The kVA total will be correct.

7) Power Factor
The PF total will be correct.

Summary for Delta Mode:

Valid Not Valid
Vca Vab, Vbc,- Incorrectly shows Vln values
kW tot Vll avg - Incorrect
kVAr tot Ia, Ib, Ic - Incorrect
kVA tot text
pf tot text
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