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9.4.7.5
Overexcitation alarm
A separate step,
AlarmPickup
, is provided for alarming purpose. It is normally set 2%
lower than (
Pickup1
) and has a definite time delay,
tAlarm
. This will give the operator an
early warning.
9.4.7.6
Logic diagram
ANSI09000161-5-en.vsd
1
AND
AND
Ei
M=
(Ei / f)
(Vn / fn)
M = relative Pickup as service value
Pick up2
M>Pick up2
Pick up1
M>Pickup1
TDForIEEE
Calc ulation
of inte rnal
induced
voltage Ei
TD
M
M
t>tAlarm
t>tMin
ALARM
AlarmPickup
V3P
BLOCK
0
0-tAlarm
0
0-tMin
0
0-1800s
100 ms
TRIP
ANSI09000161 V5 EN
Figure 141:
A simplified logic diagram of the Overexcitation protection OEXPVPH
(24)
Simplification of the diagram is in the way the IEEE delays are calculated. The cooling
process is not shown. It is not shown that voltage and frequency are separately checked
against their respective limit values.
9.4.8
Technical data
Table 177:
OEXPVPH (24) technical data
Function
Range or value
Accuracy
Trip value, pickup
(100–180)% of (
VBase/f
n
)
± 0.5% of V
Trip value, alarm
(50–120)% of pickup level
± 0.5% of V
n
at V ≤ V
n
± 0.5% of V at V > V
n
Trip value, high level
(100–200)% of (
VBase/f
n
)
± 0.5% of V
Table continues on next page
Section 9
1MRK 502 048-UUS A
Voltage protection
308
Technical manual
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