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4.2.6.12
Technical revision history
Table 406:
32N Technical revision history
Technical revision
Change
B
Equation for residual power calculation has been
updated: Po = 3VGIGCosϕ. The previous equation
was: Po = VGIGCosϕ. The change has an effect on
the
Power pickup value definition.
The previous equation is in use in the 615 Ver.4.0
with SW revision 4.0 and 615 Ver.4.0 FP1 with SW
revision 4.1. All newer versions of 615 series have
the updated equation.
C
Internal improvement
4.2.7
Third harmonic-based stator ground-fault protection 27/59THN
4.2.7.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Third harmonic-based stator ground-
fault protection
H3EFPSEF
dUo>/Uo3H
27/59THN
4.2.7.2
Function block
TRIP
PICKUP
V_3H_A
27/59THN
V_3H_B
INT_BLKD
V_3H_C
V_3H_N
BLOCK
GCB_CLOSED
V_3H_RES
GUID-EDBB2CBA-B779-4B3B-97D1-497219FDB813 V1 EN
Figure 204:
Function block
4.2.7.3
Functionality
The third harmonic-based stator ground-fault protection 27/59THN is used to detect stator
ground fault at the neutral point and at least up to 15...20% from the neutral point along the
stator winding. 27/59THN compares the third harmonic voltages produced by the
generator itself at both neutral and terminal side of the generator for detecting ground
fault.
27/59THN provides two alternative protection methods.
Section 4
1MAC059074-MB A
Protection functions
424
615 series ANSI
Technical Manual
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