Page 232 Commissioning the HPCI
We take care it. The accuracy the results strongly de-
pends constant conversion ratio between the PAW and the main winding. score 10
represents the worst case and should not used!
.
RS
UNE_3
U0d
IS
ICI_3
UNE_2
PAW
Figure 162: Possible measurement points the P-coil with PAW
The below list possible combinations and their score:
Combination the
measurement
points:
Usual measurement accuracy Score*)
ICI_3 UNE_2
UNE3
IS
ICI3 UNE2 ±10% 5
ICI3 UNE3 ±3% 3
ICI3 U0d ±3% 3
*) score represents the best solution record the measured values. The ratio
between the secondary current injection and the primary measured current value should
stay the same regardless the coil/plunger position.
PAW Power auxiliary winding
W Winding
P-coil with PAW
In this case, the P-coil functions transformer.
In addition, the measurement the zero sequence voltage should reflect the real value on
the primary side and not just the voltage the PAW
