
8.4.4
Input and output signals
Table 269:
OEXPVPH (24) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Current connection
V3P
GROUP
SIGNAL
-
Voltage connection
BLOCK
BOOLEAN
0
Block of function
RESET
BOOLEAN
0
Reset operation
Table 270:
OEXPVPH (24) Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip from overexcitation function
PICKUP
BOOLEAN
Overexcitation above set trip pickup (instantaneous)
ALARM
BOOLEAN
Overexcitation above set alarm pickup (delayed)
8.4.5
Setting parameters
Table 271:
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
t_MaxTripDelay
0.00 - 9000.00
s
0.01
1800.00
Maximum trip delay for V/Hz inverse curve, in
sec
t_CoolingK
0.10 - 9000.00
s
0.01
1200.00
Transformer magnetic core cooling time
constant, in sec
CurveType
IEEE
Tailor made
-
-
IEEE
Inverse time curve selection, IEEE/Tailor made
Table continues on next page
Section 8
1MRK505222-UUS C
Voltage protection
540
Technical reference manual
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