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Table 41: Settings
U/f op (%)
Timer
Time set (s)
105
t1
7200 (max)
112
t2
600
119
t3
60
126
t4
20
133
t5
8
140
t6
4
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 302: Example on overexcitation capability curve and V/Hz protection settings for
power transformer
9.5
Voltage differential protection VDCPTOV
SEMOD153860-1 v2
9.5.1
Identification
SEMOD167723-2 v2
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage differential protection
VDCPTOV
-
60
Section 9
1MRK 505 343-UEN B
Voltage protection
482
Application manual
Summary of Contents for Relion 670 series
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