S2 System Setup
745
Transformer Management Relay
Se
tpoints
http://www.GEindustrial.com/multilin
5–33
GE Multilin
Onload Tap Changer
PATH: SETPOINTS
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S2 SYSTEM SETUP
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ONLOAD TAP CHANGER
This section contains the settings to configure the tap position input. The 745
accepts a resistive input from the tap changer control circuitry, which is used in the
745 to dynamically correct for CT ratio mismatch based on the dynamically
changing voltage ratio of the transformer. Thus, the percent differential function of
the device can be set for greater sensitivity. See
on page 5–5 for more details on the tap position input.
•
WINDING WITH TAP CHANGER
: Enter the winding with the tap changer.
Enter 'None' for a transformer with no onload tap changer, or to disable this
feature.
•
NUMBER OF TAP POSITIONS
: Enter the number of tap positions here.
•
MINIMUM TAP POSITION VOLTAGE
: Enter the voltage at the lowest tap
position. This is an auto-ranging setpoint dependent on
S2 SYSTEM SETUP
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TRANSFORMER
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LOW VOLTAGE WINDING RATING
; see ranges in the table below.
•
VOLTAGE INCREMENT PER TAP
: Enter the voltage increment for each tap.
The range is affected by the setpoint. This is an auto-ranging setpoint
dependent on the
S2 SYSTEM SETUP
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TRANSFORMER
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LOW VOLTAGE WINDING
RATING
value; see ranges in the following table:
•
RESISTANCE INCREMENT PER TAP
: Enter the resistance increment that the
745 will see for each tap increment. The maximum resistance value for the top
tap is 5 K
Ω
.
Harmonics
PATH: SETPOINTS
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S2 SYSTEM SETUP
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HARMONICS
The 745 calculates the individual harmonics in each of the phase current inputs up
to the 21
st
harmonic. With this information, it calculates an estimate of the effect of
non-sinusoidal load currents on the transformer rated full load current. These
calculations are based on ANSI/IEEE Standard C57.110-1986, and require
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ONLOAD TAP
[
!
]
CHANGER
WINDING WITH TAP
CHANGER: None
Range: None, Winding 1, Winding 2,
Winding 3
MESSAGE
NUMBER OF TAP
POSITIONS: 33
Range: 2 to 50 in steps of 1
MESSAGE
MINIMUM TAP POSITION
VOLTAGE:
61.0 kV
Range: Dependent on
LOW VOLTAGE
WINDING RATING
; see below.
MESSAGE
VOLTAGE INCREMENT
PER TAP:
0.50 kV
Range: Dependent on
LOW VOLTAGE
WINDING RATING
; see below.
MESSAGE
RESISTANCE INCREMENT
PER TAP:
33
Ω
Range: 10 to 500
Ω
in steps of 1
Setting
Low Voltage Winding Rating Value
above 5 kV
1 kV to 5 kV
below 1 kV
MINIMUM TAP POSITION
VOLTAGE
0.1 to 2000.0 kV
in steps of 0.1
0.01 to 200.00
kV in steps of
0.01
0.001 to 20.000
kV in steps of
0.001
VOLTAGE INCREMENT PER
TAP
0.01 to 20.00 kV
in steps of 0.01
0.001 to 2.000
kV in steps of
0.001
0.0001 to
0.2000 kV in
steps of 0.0001
!
HARMONICS
[
!
]
HARMONIC DERATING
ESTIMATION: Disabled
Range: Enabled, Disabled
MESSAGE
THD MINIMUM HARMONIC
NUMBER: 2nd
Range: 2nd, 3rd, 4th,..., 21st
MESSAGE
THD MAXIMUM HARMONIC
NUMBER: 2nd
Range: 2nd, 3rd, 4th,..., 21st
Summary of Contents for Multilin 745
Page 2: ......
