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2.3 PROTECTION FUNCTION SETTINGS
Setting 1601: UVCUTOFF can be set from 35 to 99% of the nominal voltage (Setting 114: NOM VOLT). This
setting can be used to block the frequency functions from operating during start-up conditions until near-normal
generator field is applied and set voltage is generated.
2
There are either two or four underfrequency functions included with the DGP, depending on the model. Each of
the functions (Settings 1703/1803/1903/2003: SET PNT) can be set from 40.00 to 65.00 Hz, with a time delay
of 0.1 to 999.9 seconds for 81-1U and 0.05 to 99.99 seconds for the other(s). The actual settings will depend
on the protection and operating philosophies of the individual user.
There are either two or four overfrequency functions included in the DGP, depending on the model. Each of the
functions (Settings 2103/2203/2303/2403: SET PNT) can be set from 45.00 to 79.99 Hz, with a time delay of
0.05 to 99.99 seconds. The actual settings will depend on the protection and operating philosophies of the indi-
vidual user.
Setting 2501: SELBKDI1 determines the blocking action by digital input DI1 (generator off-line) when it is ener-
gized. It is set from 0 to 9 depending on the protection functions to be blocked during the start-up. The table
below describes the different blocking actions:
Table 2–4: DI1 BLOCKING CONFIGURATION
SELBKDI1
NO BLK (0)
BLK #1 (1)
BLK #2 (2)
BLK #3 (3)
BLK #4 (4)
BLK #5 (5)
BLK #6 (6)
BLK #7 (7)
BLK #8 (8)
BLK #9 (9)
1
Refer to the Nomenclature Guide for available functions
Note that for DGP***ABA models, some of the SELBKDI1 settings are functionally redundant; any one of such
settings may be used to obtain the specified functionality.
2-
36
FUNCTIONS DISABLED (X) BY DI1
81
32
-
-
X
-
X
-
X
-
X
X
-
X
X
X
-
X
X
-
X
X
DGP Digital Generator Protection System
2 CALCULATION OF SETTINGS
2.3.14 UNDERVOLTAGE CUTOFF OF 81
2.3.15 UNDERFREQUENCY 81-U
2.3.16 OVERFREQUENCY 81-O
1
VTFF
64G2 / 27TN
-
-
-
X
X
-
X
X
-
-
-
X
-
X
X
X
-
-
X
X
2.3.17 DIGITAL INPUT DI
GE Power Management
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