Built-In Overvoltage Protection Steps - ABB RES670 Technical Manual

1MRK 511 408-UUS A
11.1.6.5
11.1.6.6
11.1.6.7
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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.

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 190) 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.
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 190) 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.
Logic diagram
The simplified internal logics, for CVGAPC function are shown in the following
figures.
Section 11
Multipurpose protection
M13751-234 v3
M13751-239 v3
M13085-3 v6
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