ABB REG670 - Overexcitation Protection OEXPVPH

Function Range or value Accuracy
Minimum operate
time
(0.000-60.000) s ± 0.2% or ± 45 ms whichever is
greater
Operate time, start
at 0 to 2 x U
set
Min. = 15 ms
Max. = 30 ms
-
Reset time, start at
2 to 0 x U
set
Min. = 15 ms
Max. = 30 ms
-
Operate time, start
at 0 to 1.2 x U
set
Min. = 20 ms
Max. = 35 ms
-
Reset time, start at
1.2 to 0 x U
set
Min. = 5 ms
Max. = 25 ms
-
Critical impulse
time
10 ms typically at 0 to 2 x U
set
-
Impulse margin
time
15 ms typically -
9.4 Overexcitation protection OEXPVPH
9.4.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overexcitation protection OEXPVPH
U/f >
SYMBOL-Q V1 EN
24
9.4.2 Functionality
When the laminated core of a power transformer or generator is subjected to a
magnetic flux density beyond its design limits, stray flux will flow into non-laminated
components that are not designed to carry flux. This will cause eddy currents to flow.
These eddy currents can cause excessive heating and severe damage to insulation and
adjacent parts in a relatively short time. The function has settable inverse operating
curves and independent alarm stages.
9.4.3 Function block
IEC05000329-2-en.vsd
OEXPVPH
I3P*
U3P*
BLOCK
RESET
TRIP
START
ALARM
IEC05000329 V3 EN
Figure 249: OEXPVPH function block
Section 9 1MRK502052-UEN B
Voltage protection
516
Technical manual