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
Figure 218: Example on overexcitation capability curve and V/Hz protection
settings for power transformer
3.8.4.3 Setting parameters
Table 132: OEXPVPH (24) Group settings (basic)
Name
Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disable/Enable Operation
IBase 1 - 99999 A 1 3000 Base current (rated phase current) in A
VBase 0.05 - 2000.00 kV 0.05 400.00 Base voltage (main voltage) in kV
Pickup1 100.0 - 180.0 %VB/f 0.1 110.0 Operate level of V/Hz at no load and rated
freq in % of (Vbase/frated)
Pickup2 100.0 - 200.0 %VB/f 0.1 140.0 High level of V/Hz above which tMin is used,
in % of (Vbase/fn)
XLeakage 0.000 - 200.000 ohm 0.001 0.000 Winding leakage reactance in primary ohms
t_TripPulse 0.000 - 60.000 s 0.001 0.100 Length of the pulse for trip signal (in sec)
t_MinTripDelay 0.000 - 60.000 s 0.001 7.000 Minimum trip delay for V/Hz inverse curve, in
sec
Table continues on next page
1MRK504116-UUS C Section 3
IED application
535
Application manual
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