Trip time
Fault resistance
R
Trip
R
Alarm
IEC11000002-1-en.vsd
IEC11000002 V1 EN
Figure 158: Trip time characteristic as function of fault resistance
8.8 100% stator earth fault protection, injection based
STTIPHIZ
8.8.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
100% stator earth fault protection,
injection based
STTIPHIZ Rse< 64S
8.8.2 Application
The 100% stator earth-fault protection (STTIPHIZ) is used to detect the earth faults in
the stator windings of generators and motors. STTIPHIZ is applicable for generators
connected to the power system through a unit transformer in a block connection. An
independent signal with a certain frequency different from the generator rated
frequency is injected into the stator circuit. The response of this injected signal is used
to detect stator earth faults.
1MRK 502 071-UEN - Section 8
Impedance protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 299
Application manual
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