MR ETOS IM - Delay Time T1

7 Operation
Maschinenfabrik Reinhausen GmbH 2019112 5163667/06 ENETOS
®
IM
7.3.3 Delay time T1
Delay time T1 delays the issuing of a tap-change command for a defined pe-
riod. This prevents unnecessary tap-change operations if the tolerance
bandwidth is exited briefly.
Behavior only with delay time T1
If the measured voltage U
actual
is within the set bandwidth , no control
commands are issued to the motor-drive unit for the tap-change operation.
Control commands will also not be issued to the motor-drive unit if the mea-
sured voltage returns to the tolerance bandwidth within the set delay time
T1 . However, if the measured voltage deviates from the set bandwidth for
a long period , a tap-change command occurs after expiration of the
set delay time T1. The on-load tap-changer carries out a tap-change in a
raise or lower direction to return to the tolerance bandwidth.
Figure92: Behavior of the regulation function with delay time T1
1 +B%: Upper limit 4 Set delay time T1
2 U
desired
: Desired value 5 U
actual
: Measured voltage
3 -B%: Lower limit 6 B%: Tolerance bandwidth
A U
actual
is outside the bandwidth. De-
lay time T1 starts.
B U
actual
is within the bandwidth be-
fore delay time T1 is complete.
C U
actual
is outside the bandwidth. De-
lay time T1 starts.
D U
actual
is still outside the bandwidth
when delay time T1 is complete.
Tap-change operation is initiated.