ABB Relion 670 Series Technical Reference Manual page 545

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