Onload Tap Changer; Harmonics - GE Multilin 745 Instruction Manual

S2 System Setup

Onload Tap Changer

! ONLOAD TAP
CHANGER

Harmonics

! HARMONICS
GE Multilin
PATH: SETPOINTS !" S2 SYSTEM SETUP
[!] WINDING WITH TAP
CHANGER: None
NUMBER OF TAP
MESSAGE
POSITIONS: 33
MINIMUM TAP POSITION
MESSAGE
VOLTAGE:
VOLTAGE INCREMENT
MESSAGE
PER TAP:
RESISTANCE INCREMENT
MESSAGE
PER TAP:
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 Dynamic CT Ratio Mismatch
Correction 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
TRANSFORMER LOW VOLTAGE WINDING RATING
!"
• 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
value; see ranges in the following table:
RATING
Setting
MINIMUM TAP POSITION
VOLTAGE
VOLTAGE INCREMENT PER
TAP
• 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 KΩ.
PATH: SETPOINTS S2 SYSTEM SETUP
!"
[!] HARMONIC DERATING
ESTIMATION: Disabled
THD MINIMUM HARMONIC
MESSAGE
NUMBER: 2nd
THD MAXIMUM HARMONIC
MESSAGE
NUMBER: 2nd
The 745 calculates the individual harmonics in each of the phase current inputs up
st
to the 21 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
http://www.GEindustrial.com/multilin
Transformer Management Relay
!" ONLOAD TAP CHANGER
Range: None, Winding 1, Winding 2,
Range: 2 to 50 in steps of 1
Range: Dependent on
61.0 kV
Range: Dependent on
0.50 kV
Range: 10 to 500 Ω in steps of 1
Ω
33
; see ranges in the table below.
TRANSFORMER
!
Low Voltage Winding Rating Value
above 5 kV 1 kV to 5 kV
0.1 to 2000.0 kV 0.01 to 200.00
in steps of 0.1 kV in steps of
0.01
0.01 to 20.00 kV 0.001 to 2.000
in steps of 0.01 kV in steps of
0.001
HARMONICS
!"
Range: Enabled, Disabled
Range: 2nd, 3rd, 4th,..., 21st
Range: 2nd, 3rd, 4th,..., 21st
745
Winding 3
LOW VOLTAGE
WINDING RATING ; see below.
LOW VOLTAGE
WINDING RATING ; see below.
S2 SYSTEM SETUP !
LOW VOLTAGE WINDING
!"
below 1 kV
0.001 to 20.000
kV in steps of
0.001
0.0001 to
0.2000 kV in
steps of 0.0001
5–33