GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 81

5 SETPOINTS
PATH: SETPOINTS S2 SYSTEM SETUP
WINDING 1
[ENTER] for more
These setpoints describe the characteristics of each transformer winding and the CTs connected to them.
The above setpoint options are also available for the second and third winding. Winding 3 setpoints are only visible
if the unit has the appropriate hardware and if the selected
NOTE
• WINDING 1(3) NOM
former. The range for this setpoint is affected by the
setting (see table below).
RATING
• WINDING 1(3) RATED LOAD: Enter the self-cooled load rating for Winding 1(3) of the transformer. The range for this
setpoint is affected by the
below).
SETTING (X = 1, 2, 3)
WINDING X NOM Φ-Φ VOLTAGE
WINDING X RATED LOAD
• WINDING 1(3) PHASE CT PRIMARY: Enter the phase CT primary current rating of the current transformers con-
nected to Winding 1(3). The CT secondary current rating must match the relay phase current input rating indicated.
• WINDING 1(3) GROUND CT PRIMARY: Enter the ground CT primary current rating of the current transformers con-
nected in the Winding 1(3) neutral to ground path. The CT secondary current rating must match the relay ground cur-
rent input rating indicated. This message will only appear if the transformer type setpoint shows that Winding 1(3) is a
wye-connected winding.
• WINDING 1(3) SERIES 3-
the resistance of each of the three phases for the winding). This value is normally only available from the transformer
manufacturer's test report, and is used in the 745 for calculation of harmonic derating factor.
GE Multilin
Courtesy of NationalSwitchgear.com
WINDING 1(3)
ð
WINDING 1 NOM
ENTER
VOLTAGE: 220.0 kV
ESCAPE
WINDING 1 RATED
ESCAPE
LOAD: 100.0 MVA
MESSAGE
WINDING 1 PHASE CT
ESCAPE
PRIMARY: 500:5 A
MESSAGE
WINDING 1 GROUND CT
ESCAPE
PRIMARY: 500:5 A
MESSAGE
WINDING 1 SERIES 3
ESCAPE
RESISTANCE: 10.700
MESSAGE
- VOLTAGE: Enter the nominal phase-to-phase voltage rating of Winding 1(3) of the trans-
Φ Φ
S2 SYSTEM SETUP TRANSFORMER
ABOVE 5 KV
0.1 to 2000.0
in steps of 0.1 kV
0.1 to 2000.0
in steps of 0.1 MVA
RESISTANCE: Enter the series three-phase resistance of the winding (that is, the sum of
Φ
745 Transformer Management Relay
Range: Dependent on
Φ - Φ
setpoint; see description below.
Range: Dependent on
setpoint; see description below.
Range: 1 to 50000:5 A in steps of 1
Range: 1 to 50000:5 A in steps of 1
Range: 0.001 to 50.000 Ω in steps of 0.001
Φ
Ω
is 3-winding transformer.
TRANSFORMER TYPE
S2 SYSTEM SETUP TRANSFORMER
LOW VOLTAGE WINDING RATING
LOW VOLTAGE WINDING RATING VALUE
1 KV TO 5 KV
0.01 to 200.00
in steps of 0.01 kV
0.01 to 200.00
in steps of 0.01 MVA
5.4 S2 SYSTEM SETUP
5.4.3 WINDING
LOW VOLTAGE WINDING RATING
LOW VOLTAGE WINDING RATING
LOW VOLTAGE WINDING
setting (see the table
BELOW 1 KV
0.001 to 20.000
in steps of 0.001 kV
0.001 to 20.000
in steps of 0.001 MVA
5-31
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