When set, the pickup signal will start definite time delay or inverse (IDMT) time delay in accordance
with the end user setting. If the pickup signal has value one for longer time than the set time delay,
the overcurrent step will set its trip signal to one. Reset of the pickup and trip signal can be
instantaneous or time delay in accordance with the end user setting.
11.1.7.4 Built-in undercurrent protection steps
M13751-231 v2
Two undercurrent protection steps are available. They are absolutely identical and therefore only
one will be explained here. Undercurrent step simply compares the magnitude of the measured
current quantity (see table
409) with the set pickup level. The undercurrent step will pickup and
set its pickup signal to one if the magnitude of the measured current quantity is smaller than this
set level. The pickup signal will start definite time delay with set time delay. If the pickup signal has
value one for longer time than the set time delay the undercurrent step will set its trip signal to
one. Reset of the pickup and trip signal can be instantaneous or time delay in accordance with the
setting.
11.1.7.5 Built-in overvoltage protection steps
M13751-234 v3
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
410) 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 pickup signal will start definite time delay or inverse (IDMT) time delay in accordance with the
end user setting. If the pickup 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 pickup 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
M13751-239 v3
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
410) 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 pickup signal will start definite time delay or inverse (IDMT) time delay in accordance with the
end user setting. If the pickup 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 pickup and trip signal can be
instantaneous or time delay in accordance with the end user setting.
11.1.7.7 Inadvertent generator energizing
SEMOD158309-4 v2
The inadvertent energizing function is realized by means of the general current and voltage
protection function (CAGVPC). CVGAPC is configured as shown in figure
376.
1MRK 502 066-UUS B Section 11
Multipurpose protection
705
Technical manual
To Next Page
Loading...
