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1MRK 502 071-UUS A
8.7.3.3
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
Settings for sensitive rotor earth fault protection,ROTIPHIZ (64R)
Operation to be set Enabled to activate the sensitive rotor earth-fault protection
RTrip is the resistance level,set directly in primary Ohms, for activation of the trip-
function.
RAlarm is the resistance level, set directly in primary Ohms, for activation of the
alarm-function.
tAlarm is the time delay to activate the ALARM signal output when the measured fault
resistance is below the set RAlarm level
FactACLim is the scale factor for ground fault on AC side of exiter
tTripAC is the time delay for TRIP signal on the AC side of exiter
VLimRMS setting is not used in rotor protection application.
FreqInjected to be set on the injection unit REX060 for the stator earth-fault
protection. The setting range is 75 – 250 Hz in steps of 0.001 Hz. In the choice of the
injection frequency harmonics of the fundamental frequency (50 or 60 Hz) should be
avoided as well as other harmonics related to other frequencies in the power system,
for instance railway electrical systems with the fundamental frequency 16 2/3 Hz or 20
Hz. The recommended setting is 113Hz in 50Hz power system and 137Hz in 60Hz
power system. The setting is fine tuned in connection to the commissioning calibration
measurement and analysis in the ICT tool.
The complex factors k1Real, k1Imag, k2Real, k21Imag are setting parameters. The
factors k1 and k2 as well as the reference impedances, RefR1, RefX1 and RefR2, RefX2,
are derived from the calibration measurements during commissioning. ICT (Injection
Commissioning Tool) must be used for the calibration process due to the complex
nature of analysis and calculations. This tool is an integrated part of the PCM600.
FilterLength should be left at its default value; any change of this parameter should be
defined under ABB supervision.
FilterLength setting affects the TRIP signal, see figure
Section 8
Impedance protection
GUID-B52FA915-FD55-4AEF-84EA-E74EA196A029 v3
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