Monitored Data - ABB Relion Technical Manual

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