MR TRAFOGUARD ISM, Operating Instructions Manual

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6 Functions and settings
Maschinenfabrik Reinhausen GmbH 2016 117 5163667/00 EN TRAFOGUARD® ISM®
Delay time limit value
You can use this parameter to set the delay time. If a limit value is violated,
the device only undertakes the set behavior once the delay time has
elapsed. The purpose of the delay time is to allow the device to ignore brief
limit value violations.
Behavior limit value
You can use this parameter to define how the device behaves when a limit
value is violated. The options available may vary depending on the limit val-
ue. The following options are available:
Option Description
Off The limit value is not monitored.
High-speed re-
turn The device continues to perform tap-change opera-
tions in the required direction until the limit value is no
longer violated. The device ignores the set delay time
T1 of automatic voltage regulation.
Auto blocking The device blocks automatic voltage regulation.
Auto/manual
blocking The device blocks automatic voltage regulation and
manual tap-change operations.
Auto-blocking
for lower step The device blocks tap-change operations to a lower
tap position.
Auto-blocking
for raise step The device blocks tap-change operations to a higher
tap position.
Auto/manual
blocking for low-
er step The device blocks automatic voltage regulation and
manual tap-change operations to a lower tap position.
Auto/manual
blocking for
raise step The device blocks automatic voltage regulation and
manual tap-change operations to a higher tap position.
Switch to Man-
ual The device switches to manual mode.
Target tap posi-
tion The device automatically switches to the set target tap
position.
Table 28: Device behavior
Voltage monitoring
To monitor the transformer's current output voltage, you can set 4 limit val-
ues:
▪
Undervoltage U<<
▪ Undervoltage U<
▪ Overvoltage U>
▪ Overvoltage U>>
6.7.1