6 Functions and settings
Maschinenfabrik Reinhausen GmbH 2016
92
5163667/00 EN
TRAFOGUARD® ISM®
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 meas-
ured 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 78: 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 band-
width. Delay time T1 starts.
B
U
actual
is within the bandwidth
before delay time T1 is com-
plete.
C
U
actual
is outside the band-
width. Delay time T1 starts.
D
U
actual
is still outside the band-
width when delay time T1 is
complete. Tap-change opera-
tion is initiated.
Setting delay time T1
To set the delay time T1, proceed as follows:
1.
Go to
Settings > Parameters > Control > Delay time T1
.
2.
Enter delay time T1.
3.
Press the
Accept
button to save the modified parameter.
Summary of Contents for TRAFOGUARD ISM
Page 1: ...Monitoring System TRAFOGUARD ISM Operating Instructions 5163667 00 EN ...
Page 222: ......
Page 223: ......
