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63230-500-225A2 PowerLogic
TM
Series 800 Power Meter
3/2011 Appendix A—Instrument Transformer Wiring: Troubleshooting Tables
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77
Section III—Case E
Symptoms: 4-Wire Possible Causes
• kW = near 0
• kVA = near 0
• 3-phase average power factor flip-flopping lead
and lag
• Voltages, currents, and kVA are normal
• Two CT secondary leads are swapped (A-phase on B-phase terminal, for
example).
• Two PT secondary leads are swapped (A-phase on B-phase terminal, for
example).
NOTE: In either case, the phase input that is not swapped will read normal lagging power
factor.
Section III—Case F
Symptoms: 4-Wire Possible Causes
• kW = negative and less than kVAR
• KVAR = negative and close to value expected
for kW
• kVA = expected value
• Power factor low and leading
• Voltages and currents are normal
• All three PT lead connections “rotated” counterclockwise: A-phase wire on
C-phase terminal, B-phase wire on A-phase terminal, C-phase wire on B-
phase terminal.
• All three CT lead connections “rotated” clockwise: A-phase wire on B-phase
terminal, B-phase wire on C-phase terminal, C-phase wire on A-phase
terminal.
Section III—Case G
Symptoms: 4-Wire Possible Causes
• kW = negative and less than kVAR
• kVAR = positive and close to the value for kW
NOTE: looks like kW and kVAR swapped places
•
kVA = expected value
• Power factor low and lagging
• Voltages and currents are normal
• All three PT lead connections “rotated” clockwise: A-phase wire on B-phase
terminal, B-phase wire on C-phase terminal, C-phase wire on A-phase
terminal.
• All three CT lead connections “rotated” counterclockwise: A-phase wire on
C-phase terminal, B-phase wire on A-phase terminal, C-phase wire on B-
phase terminal.