ABB REG670 Applications Manual page 467

1MRK 502 071-UEN -
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
For big and important machines, fast protection against inadvertent energizing should,
therefore, be included in the protective scheme.
The protection against inadvertent energization can be made by a combination of
undervoltage, overvoltage and overcurrent protection functions. The undervoltage
function will, with a delay for example 10 s, detect the situation when the generator is
not connected to the grid (standstill) and activate the overcurrent function. The
overvoltage function will detect the situation when the generator is taken into
operation and will disable the overcurrent function. The overcurrent function will
have a pick-up value about 50% of the rated current of the generator. The trip delay
will be about 50 ms.
The inadvertent energization function is realized by means of the general current and
voltage protection function (CVGAPC). The function is configured as shown in
figure 220.
CVGAPC
3IP
3UP
BLKOC1
IEC08000288 V1 EN
Figure 220: Configuration of the inadvertent energization function
The setting of the function in the inadvertent energization application is done as
described below. It is assumed that the instance is used only for the inadvertent
energization application. It is however possible to extent the use of the instance by
using OC2, UC1, UC2, OV2, UV2 for other protection applications.
TROC1
S
TROV1
R
TRUV1
en08000288.vsd
Section 12
Multipurpose protection
Q
Q
461