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DGP Digital Generator Protection System GE Power Management
2.2 CONFIGURATION SETTINGS 2 CALCULATION OF SETTINGS
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2.2 CONFIGURATION SETTINGS 2.2.1 DESCRIPTION
101: UNITID – UNIT ID NUMBER
UNITID
is a decimal number between 0 and 9999 (for units with GE Modem protocol only) or 1 to 127 (for units
with Modbus protocol) stored in non-volatile memory that uniquely identifies a DGP relay system. When the
DGP is accessed via one of its serial ports, the
UNITID
is required to establish communication, thus providing
a measure of security.
UNITID
can only be changed via the local MMI. It is not possible to change
UNITID
with
the GE-Link communication software.
102: SYSFREQ – SYSTEM FREQUENCY
SYSFREQ
can be set to either 50 Hz or 60 Hz.
103: SEL TVM – SELECT TRIP VOLTAGE MONITORING
One contact of each of the four trip output relays can be monitored for DC voltage. The monitoring is enabled
or disabled by setting
SEL TVM
to 1 or 0, respectively. The four-digit code of the
SEL TVM
setting applies to
94G, 94G1, 94G2, and 94G3, in that order. For example, a setting of 1100 enables trip voltage monitoring for
94G and 94G1 and disables for 94G2 and 94G3.
The monitoring of all unused contacts should be disabled to avoid nuisance alarms.
104: SEL TCM – SELECT TRIP CURRENT MONITORING
The four trip contacts described above for the
SEL TVM
can also be monitored for DC current when a trip sig-
nal is issued. This monitoring is enabled or disabled by setting
SEL TCM
to 1 or 0, respectively. The four-digit
code of the
SEL TCM
setting applies to 94G, 94G1, 94G2, and 94G3, in that order. If the trip current through
any of the monitored contacts is not expected to be above 150 mA, or if any of the trip circuit is not interrupted
externally, it should be disabled to avoid nuisance sequence-of-event points or seal-in of the output relay.
For example, a setting of 1000 enables TCM for 94G and disables for 94G1, 94G2, and 94G3.
105: SELPRIM – SELECT PRIMARY/SECONDARY UNITS
SELPRIM
can be set to either 0 (PRIMARY) or 1 (SECNDRY). This setting determines whether the present
values (currents, voltages, watts, and vars) are displayed and stored as primary or secondary values. All user-
entered settings are expressed in terms of secondary values, regardless of the
SELPRIM
setting.
106: CT RATIO – CURRENT TRANSFORMER RATIO
CT RATIO
can be set from 1 to 50000. This setting applies to all current inputs with a possible exception of cur-
rent
I
NR
.
If Setting 117:
NCTRATIO
is provided, then it applies to the current
I
NR
. Refer to the Neutral Current
Transformer Ratio (Setting 117:
NCTRATIO
) described later.
For the sample generator system,
107: VT RATIO – VOLTAGE TRANSFORMER RATIO
VT RATIO
can be set from 1.0 to 240.0.
For the sample generator system,
CT RATIO
8000
5
------------- 1600
==
VT RATIO
18900
120
---------------- 157.5
==
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