Name
Values (Range)
Unit
Step
Default
Description
t_MinTripDelay
0.005 - 60.000
s
0.001
7.000
Minimum trip delay for V/Hz curve
TDForIEEECurve
1 - 60
-
1
1
Time multiplier for IEEE inverse type curve
AlarmPickup
50.0 - 120.0
%
0.1
100.0
Alarm pickup level
tAlarm
0.00 - 9000.00
s
0.01
5.00
Alarm time delay
Table 175:
OEXPVPH (24) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 - 6
-
1
1
Selection of one of the Global Base Value
groups
VoltConn
Pos Seq
UL1
UL2
UL3
UL1L2
UL2L3
UL3L1
-
-
Pos Seq
Selection of measured voltage
Only PosSeq or UL1L2 should be selected for the
VoltConn
setting.
9.4.6
Monitored data
Table 176:
OEXPVPH (24) Monitored data
Name
Type
Values (Range)
Unit
Description
TMTOTRIP
REAL
-
s
Calculated time to trip for
overexcitation, in sec
VPERHZ
REAL
-
V/Hz
Voltage to frequency ratio in
per-unit
THERMSTA
REAL
-
%
Overexcitation thermal status
in % of trip pickup
9.4.7
Operation principle
The importance of Overexcitation protection (OEXPVPH, 24) function is growing as the
power transformers as well as other power system elements today operate near their
designated limits most of the time.
Modern design transformers are more sensitive to overexcitation than earlier types. This
is a result of the more efficient designs and designs which rely on the improvement in the
1MRK 502 048-UUS A
Section 9
Voltage protection
301
Technical manual
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