The ratio
between the secondary current injection and the primary measured current value should
stay the same regardless the coil/plunger position.
.
In addition, the measurement the zero sequence voltage should reflect the real value on
the primary side and not just the voltage the PAW.5. The accuracy the results strongly de-
pends constant conversion ratio between the PAW and the main winding.Page 195
Commissioning current injection
13.1 Impact the P-coil's design the results of
current injection
air-gap
d
higher
lower Imin
Imax
moveable
core
spindle
moveable
core
fixed core
primary
winding
PAW
MW
Figure 132: Basic design continuously adjustable P-coil
PAW Power auxiliary winding
W Winding
P-coil with PAW
In this case, the P-coil functions transformer
