Schneider Electric PowerLogic PM5300 Series Spécifications Page 60

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 68
  • Table des matières
  • DEPANNAGE
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 59
Power Meter 750 63230-507-201A1
Appendix C—Instrument Transformer Wiring: Troubleshooting Guide 03/2007
© 2007 Schneider Electric All Rights Reserved56
FIELD EXAMPLE Readings from a 4-wire system
lag to lead fluctuating
Troubleshooting Diagnosis
Power factors cannot be correct
None of the “Section II” symptoms exist, so proceed to the 4-wire
troubleshooting (“Section IV”)
Cannot calculate kW because 3-phase power factor cannot be right, so
calculate kVA instead
Calculated kVA =
=
=
Power meter reading is essentially zero compared to this value
4-wire Case E looks similar
Since the PTs were connected to other power meters which were
reading correctly, suspect two CT leads swapped
Since A-phase power factor is the only one that has a normal looking
lagging value, suspect B and C-phase CT leads may be swapped
After swapping B and C-phase CT leads, all readings went to the
expected values; problem solved
kW 25=
kVAR 15=
kVA 27=
I
A
904A=
I
B
910A=
I
C
931A=
I
3Φ Avg
908A=
V
AB
495V=
V
BC
491V=
V
CA
491V=
V
AN
287V=
V
BN
287V=
V
CN
284V=
PF
3Φ Avg
0.75= 0.22
3V
ab
× I
3ΦAvg
×)1000(
1.732 495 908 ) 1000××(
778 kVA
Vue de la page 59
1 2 ... 55 56 57 58 59 60 61 62 63 64 65 66 67 68

Commentaires sur ces manuels

Pas de commentaire