en06000449.vsd
Samples:
Generator
terminal
voltage
3rd
harmonic
Fourier
filtering
giving UT3
Complex UT3
Samples:
Generator
neutral point
voltage
3rd
harmonic
Fourier
filtering
giving UN3
Complex UN3
Stator Earth
Fault
detection
3rd
harmonic
based
Start
Start
and trip
logic
TRIP
TRIP3H
TRIPUN
START3H
STARTUN
Fundamental frequency residual
voltage
Stator Earth
Fault
detection
95 %
Start
CB Status
Block
IEC06000449 V2 EN
Figure 259:
Simplified logic diagram for stator earth fault protection
STEFPHIZ function can be described in a simplified logical diagram as shown in
figure
. Note that the 3rd harmonic numerical filters are not part of the stator earth-
fault protection function.
These third harmonic voltages are calculated by the preprocessing blocks connected
to the function.
1MRK502052-UEN B
Section 9
Voltage protection
539
Technical manual
Summary of Contents for Relion REG670
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