To prevent damages on the generator or turbine, it is essential that high speed tripping
is provided in case of inadvertent energization of the generator. This tripping should
be almost instantaneous (< 100 ms).
There is a risk that the current into the generator at inadvertent energization will be
limited so that the “normal” overcurrent or underimpedance protection will not detect
the dangerous situation. The delay of these protection functions might be too long. For
big and important machines, fast protection against inadvertent energizing should,
therefore, be included in the protective scheme.
11.1.3
Function block
IEC05000372-2-en.vsd
CVGAPC
I3P*
U3P*
BLOCK
BLKOC1
BLKOC1TR
ENMLTOC1
BLKOC2
BLKOC2TR
ENMLTOC2
BLKUC1
BLKUC1TR
BLKUC2
BLKUC2TR
BLKOV1
BLKOV1TR
BLKOV2
BLKOV2TR
BLKUV1
BLKUV1TR
BLKUV2
BLKUV2TR
TRIP
TROC1
TROC2
TRUC1
TRUC2
TROV1
TROV2
TRUV1
TRUV2
START
STOC1
STOC2
STUC1
STUC2
STOV1
STOV2
STUV1
STUV2
BLK2ND
DIROC1
DIROC2
UDIRLOW
CURRENT
ICOSFI
VOLTAGE
UIANGLE
IEC05000372 V2 EN
Figure 271:
CVGAPC function block
11.1.4
Signals
Table 326:
CVGAPC Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Group signal for current input
U3P
GROUP
SIGNAL
-
Group signal for voltage input
BLOCK
BOOLEAN
0
Block of function
BLKOC1
BOOLEAN
0
Block of over current function OC1
BLKOC1TR
BOOLEAN
0
Block of trip for over current function OC1
ENMLTOC1
BOOLEAN
0
When activated, the current multiplier is in use for
OC1
Table continues on next page
Section 11
1MRK502052-UEN B
Multipurpose protection
566
Technical manual
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