Page 233
Commissioning the HPCI
P-coil without PAW
Older coils may not equipped with power auxiliary winding.
CAUTION
Observe the power requirements the power auxiliary winding!
Secondary nominal voltage 500 AC
Secondary nominal voltage continuous: 100 A
Nominal voltage primary side line-to-earth-voltage for the nominal voltage
(Medium voltage side)
The short-circuit impedance should small possible.
In this case, single-phase transformer can used instead and connected parallel the
P-coil's main winding. score 10
represents the worst case and should not used!
.
RS
ICI_1
UNE_3
U0d
IS
ICI_2
UNE_2
UNE_1 PAWEquiv
Figure 163: Possible measurement points the P-coil without PAW
The below list possible combinations and their score:
Measure-
ment points:
Usual measurement accuracy Score*)
ICI_2 /ICI_1 UNE_2 (Ipos) IS
ICI1 UNE1 Not usable 10
ICI1 UNE2 ±10% 3
ICI1 UNE3 ±3% 2
ICI1 U0d ±3% 2
*) score represents the best solution record the measured values
