Function Range or value Accuracy
Trip time, pickup at 0 to 1.2 x V
set
Min. = 20 ms
Max. = 35 ms
-
Reset time, pickup at 1.2 to 0 x V
set
Min. = 5 ms
Max. = 25 ms
-
Critical impulse time 10 ms typically at 0 to 2 x V
set
-
Impulse margin time 15 ms typically -
9.4 Overexcitation protection OEXPVPH (24)
IP14547-1 v3
9.4.1 Identification
M14867-1 v3
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overexcitation protection OEXPVPH
SYMBOL-Q V1 EN-US
24
9.4.2 Functionality
M13319-3 v9
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
M13326-3 v5
ANSI05000329-2-en.vsd
OEXPVPH (24)
I3P*
V3P*
BLOCK
RESET
TRIP
PICKUP
ALARM
ANSI05000329 V2 EN-US
Figure 346: OEXPVPH (24) function block
Section 9 1MRK 502 066-UUS B
Voltage protection
636
Technical manual
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