en06000449_ansi.vsd
Samples:
Generator
terminal
voltage
3rd
harmonic
Fourier
filtering
giving VT3
Complex VT3
Samples:
Generator
neutral point
voltage
3rd
harmonic
Fourier
filtering
giving VN3
Complex VN3
Stator
Ground
Fault
detection
3rd
harmonic
based
Pickup
Pickup
and trip
logic
TRIP
TRIP3H
TRIPVN
PU3H
PU_VN
Fundamental frequency residual
voltage
Stator
Ground
Fault
detection
95 %
Pickup
CB Status
Block
ANSI06000449 V2 EN-US
Figure 356: Simplified logic diagram for stator ground fault protection
STEFPHIZ (59THD) function can be described in a simplified logical diagram as shown in figure
357. Note that the 3rd harmonic numerical filters are not part of the stator ground-fault protection
function.
These third harmonic voltages are calculated by the preprocessing blocks connected to the
function.
Section 9 1MRK 502 066-UUS B
Voltage protection
658
Technical manual
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