Issue
When the ION8650 is set to 35 or 35S, 4-Wire WYE, 2 PTs, 3 CTs, the meter does not seem to read correctly.
Product Line
ION8650
ION8600
Environment
System Setup
Resolution
***This configuration can affect some of the meters parameter calculations. Contact Schneider Electric for details.***
This configuration will work for measuring total power. When an ION8650/8600 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.
- Phase to Neutral Voltages
Will not be displayed, because DELTA mode does not display line-to-neutral voltages.
- Phase to Phase Voltages
Vab and Vbc will display phase to neutral voltages. Vca will correctly show the phase-to-phase voltage. Vll avg will be incorrect.
- 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.
- Real Power
The kW total will be correct.
- Reactive Power
The kVAr total will be correct.
- Apparent Power
The kVA total will be correct.
- 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 | |
| pf tot |
發佈於: 施耐德電機Taiwan
