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2.2 CONFIGURATION SETTINGS
2.2 CONFIGURATION SETTINGS
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
2
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
If Setting 117: NCTRATIO is provided, then it applies to the current I
NR .
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,
2-
10
8000
CT RATIO
=
------------ -
=
1600
5
18900
VT RATIO
157.5
=
--------------- -
=
120
DGP Digital Generator Protection System
2 CALCULATION OF SETTINGS
2.2.1 DESCRIPTION
. Refer to the Neutral Current
NR
GE Power Management
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