IEC05000749 V1 EN-US
Figure 65: Current voltage characteristics for the non-linear resistors, in the range 10-200 V, the average
range of current is: 0.01–10 mA
7.3 Generator differential protection GENPDIF (87G)
SEMOD156679-1 v3
7.3.1 Identification
SEMOD158971-2 v5
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Generator differential protection GENPDIF
SYMBOL-NN V1 EN-US
87G
7.3.2 Application
SEMOD143241-4 v4
Short circuit between the phases of the stator windings causes normally very large fault
currents. The short circuit generates risk of damages on insulation, windings and stator
core. The lar
ge short circuit currents cause large current forces, which can damage
other components in the power plant, such as turbine and generator-turbine shaft. The
short circuit can also initiate explosion and fire. When a short circuit occurs in a
generator there is a damage that has to be repaired. The severity and thus the repair
time are dependent on the degree of damage, which is highly dependent on the fault
1MRK 502 071-UUS A Section 7
Differential protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 177
Application manual
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