![background image](http://html.mh-extra.com/html/abb/relion-670-series-reg670/relion-670-series-reg670_applications-manual_4795504.webp)
reverse power protection might detect the situation but the operation time of this
protection is normally too long.
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
.
ANSI10000028-1-en.vsd
3IP
3VP
BLKOC1
TROV1
TROC1
CVGAPC
TRUV1
S
R
Q
Q
ANSI10000028 V1 EN-US
Figure 220:
Configuration of the inadvertent energization function
Section 12
1MRK 502 071-UUS A
Multipurpose protection
498
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
Summary of Contents for RELION 670 SERIES REG670
Page 1: ...RELION 670 SERIES Generator protection REG670 Version 2 2 ANSI Application manual ...
Page 2: ......
Page 44: ...38 ...
Page 66: ...60 ...
Page 102: ...96 ...
Page 200: ...194 ...
Page 442: ...436 ...
Page 486: ...480 ...
Page 508: ...502 ...
Page 514: ...508 ...
Page 524: ...518 ...
Page 658: ...652 ...
Page 736: ...730 ...
Page 774: ...768 ...
Page 828: ...822 ...
Page 829: ...823 ...