Datakom DKM-411, Руководство пользователя, Страница: 19 / 91

DKM-411 User Manual Rev_01 Firmware V-1.0
K46D03-EN - 19 -
EFFECT OF POLARITY REVERSAL
The network is still loaded with 100 kW On each phase. The load Power Factor (PF) is 1.
PF in phase L2 will show -1,00 due to reverse CT polarity. The result is that total measured power
displayed by the analyser is 100 kW.
Measured values are as follows:
kW kVAr kVA pf
Phase L1 100.0 0.0 100 1.00
Phase L2
-100.0 0.0 100 -1.00
Phase L3 100.0 0.0 100 1.00
Total 100.0 0.0 300 0.33
EFFECT OF PHASE SWAPPING
The network is still loaded with 100 kW on each phase. The load Power Factor (PF) is 1.
PF in phases L2 and L3 will show -0,50 due to phase shift between voltages and currents which is
caused by CT swapping. The result is that total measured power displayed by controller is 0 kW.
Measured values are as follows:
kW kVAr kVA pf
Phase L1 100.0 0.0 100 1.00
Phase L2 -50.0 86.6 100 -0.50
Phase L3 -50.0 -86.6 100 -0.50
Total 0.0 0.0 300 0.0