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
) 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
) 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
.
Section 11
1MRK502052-UEN B
Multipurpose protection
584
Technical manual
Summary of Contents for Relion REG670
Page 1: ...Relion 670 series Generator protection REG670 2 0 IEC Technical manual ...
Page 2: ......
Page 44: ...38 ...
Page 58: ...52 ...
Page 80: ...74 ...
Page 106: ...100 ...
Page 482: ...476 ...
Page 548: ...542 ...
Page 570: ...564 ...
Page 600: ...594 ...
Page 608: ...602 ...
Page 630: ...624 ...
Page 862: ...856 ...
Page 1094: ...1088 ...
Page 1226: ...1220 ...
Page 1250: ...1244 ...
Page 1297: ...1291 ...