Information on the cooling time constant T
cool
should be retrieved from the power
transformer manufacturer.
1 2 5 50 200
110
120
130
140
150
100
0.05 0.1 0.2 0.5 10 20 100
V/Hz
%
Continous
Time
(minutes)
t6 t5 t4 t3 t2 t1
transformer capability curve
relay operate characteristic
en01000377.vsd
IEC01000377 V1 EN-US
Figure 298: Example on overexcitation capability curve and V/Hz protection
settings for power transformer
10.5 Voltage differential protection VDCPTOV (60)
SEMOD153860-1 v2
10.5.1 Identification
SEMOD167723-2 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage differential protection VDCPTOV - 60
Section 10 1MRK 504 163-UUS A
Voltage protection
632 Transformer protection RET670 2.2 ANSI
Application manual
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