Woodward SEG HighPROTEC MRA4, Device Manual

Page: 230 / 510

Field Parameters
EVT con Method how the residual
voltage is to be detected.
Calculation is only possible, if
the device is connected to
phase-to-earth voltages.
Calculated: that means that
the residual voltage is
calculated from the
geometrical sum of the phase-
to-neutral voltages.
WARNING! For V-
connections no calculation of
the residual voltage is
possible. Measured: The e-n-
windings are connected to the
measuring inputs for the
residual voltage (open delta).
The primary and secondary
rated data (EVT pri and EVT
sec) of the voltage
transformers have to be taken
into account.
Calculation of the residual
voltage is only possible if: VT
con = Phase to Earth
measured,
calculated
measured [Field Para]
V Block f Threshold for the release of
the frequency stages
0.15 - 1.00Vn 0.5Vn [Field Para]
I MTA Maximum Torque Angle:
Angle between phase current
and reference voltage in case
of a short circuit. This angle is
needed to determine the fault
direction in case of short
circuits.
0 - 355° 45° [Field Para]
Star point treatm Star point treatment sin (-90°),
cos (180°),
SOLI-RESI
SOLI-RESI [Field Para]
IG MTA Maximum Torque Angle:
Angle between earth current
and residual voltage in case of
a short circuit. This angle is
needed to determine the fault
direction in case of short
circuits.
Only available if: Star point
treatment = Solidly or low
resistance earthed
0 - 355° 110° [Field Para]
Page 230 EN MRA4 04/09