11.1.7.5 Built-in overvoltage protection steps
Two overvoltage protection steps are available. They are absolutely identical and
therefore only one will be explained here.
Overvoltage step simply compares the magnitude of the measured voltage quantity
(see table
333) with the set pickup level. The overvoltage step will pickup if the
magnitude of the measured voltage quantity is bigger than this set level.
The start signal will start definite time delay or inverse (IDMT) time delay in
accordance with the end user setting. If the start signal has value one for longer time
than the set time delay, the overvoltage step will set its trip signal to one. Reset of the
start and trip signal can be instantaneous or time delay in accordance with the end user
setting.
11.1.7.6 Built-in undervoltage protection steps
Two undervoltage protection steps are available. They are absolutely identical and
therefore only one will be explained here.
Undervoltage step simply compares the magnitude of the measured voltage quantity
(see table 333) with the set pickup level. The undervoltage step will pickup if the
magnitude of the measured voltage quantity is smaller than this set level.
The start signal will start definite time delay or inverse (IDMT) time delay in
accordance with the end user setting. If the start signal has value one for longer time
than the set time delay, the undervoltage step will set its trip signal to one. Reset of the
start and trip signal can be instantaneous or time delay in accordance with the end user
setting.
11.1.7.7 Inadvertent generator energizing
The inadvertent energizing function is realized by means of the general current and
voltage protection function (CAGVPC). CVGAPC is configured as shown in
figure
277.
Section 11 1MRK502052-UEN B
Multipurpose protection
584
Technical manual
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