
8.4.2.6
Logic diagram
ANSI05000162-2-en.vsd
OR
&
&
BLOCK
Xleakage
Ei
M=
(Ei / f)
(Vn / fn)
M = relative Pickup as service value
Pickup2
M>Pickup2
Pickup1
M>Pickup1
IEEE law
Tailor-made law
Calculation
of internal
induced
voltage Ei
TD
M
M
M
ALARM
TRIP
AlarmPickup
0
0
0-tMax
0
0-tMax
0-tMax
t>tAlarm
t>tMin
t_MaxTripDelay
t_MinTripDelay
tAlarm
V3P
I3P
ANSI05000162 V2 EN
Figure 275:
A simplified logic diagram of the Overexcitation protection OEXPVPH
(24)
Simplification of the diagram is in the way the IEEE and Tailor-made 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.
8.4.3
Function block
ANSI05000329-2-en.vsd
OEXPVPH (24)
I3P*
V3P*
BLOCK
RESET
TRIP
PICKUP
ALARM
ANSI05000329 V2 EN
Figure 276:
OEXPVPH (24) function block
1MRK505222-UUS C
Section 8
Voltage protection
539
Technical reference manual
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