Monitored Data - ABB Relion Technical Manual
Generator protection
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Also See for Relion:
- Commissioning manual (202 pages) ,
- Applications manual (320 pages) ,
- Applications manual (84 pages)
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1MRK 502 048-UUS A
Name
Values (Range)
t_MinTripDelay
0.005 - 60.000
TDForIEEECurve
1 - 60
AlarmPickup
50.0 - 120.0
tAlarm
0.00 - 9000.00
Table 175:
OEXPVPH (24) Non group settings (basic)
Name
Values (Range)
GlobalBaseSel
1 - 6
VoltConn
Pos Seq
UL1
UL2
UL3
UL1L2
UL2L3
UL3L1
9.4.6
9.4.7
Technical manual
Unit
Step
s
0.001
-
1
%
0.1
s
0.01
Unit
Step
-
1
-
-
Only PosSeq or UL1L2 should be selected for the VoltConn setting.
Monitored data
Table 176:
OEXPVPH (24) Monitored data
Name
Type
TMTOTRIP
REAL
VPERHZ
REAL
THERMSTA
REAL
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
Default
Description
7.000
Minimum trip delay for V/Hz curve
1
Time multiplier for IEEE inverse type curve
100.0
Alarm pickup level
5.00
Alarm time delay
Default
Description
1
Selection of one of the Global Base Value
groups
Pos Seq
Selection of measured voltage
Values (Range)
Unit
-
s
-
V/Hz
-
%
Section 9
Voltage protection
Description
Calculated time to trip for
overexcitation, in sec
Voltage to frequency ratio in
per-unit
Overexcitation thermal status
in % of trip pickup
301
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