GE 745 Instruction Manual page 149

CHAPTER 5: SETPOINTS
5.6.3.4 Energization inhibit

ENERGIZATION [
INHIBIT
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
PATH: SETPOINTS S4 ELEMENTS


] ENERGIZATION INHIBIT
FUNCTION: Enabled
ENERGIZATION INHIBIT
MESSAGE
PARAMETERS: 2nd
HARMONIC AVERAGING:
MESSAGE
Enabled
ENERGIZATION INHIBIT
MESSAGE
LEVEL: 20.0% f0
ENERGIZATION INHIBIT
MESSAGE
DURATION: 0.10 s
ENERGIZATION SENSING
MESSAGE
BY CURRENT: Enabled
MINIMUM ENERGIZATION
MESSAGE
CURRENT: 0.10 x CT
ENERGIZATION SENSING
MESSAGE
BY VOLTAGE: Disabled
MINIMUM ENERGIZATION
MESSAGE
VOLTAGE: 0.85 x VT
BREAKERS ARE OPEN
MESSAGE
SIGNAL: Disabled
PARALL XFMR BRKR CLS
MESSAGE
SIGNAL: Disabled
Over and above the standard harmonic inhibit feature programmed above, the 745
contains a harmonic inhibit feature which is in service only during energization and/or
sympathetic inrush. De-energization and energization of the transformer is detected by
any of the following three methods:
FIGURE 5–10: Harmonic inhibit scheme logic
DIFFERENTIAL

S4 ELEMENTS
ENERGIZATION INHIBIT

Range: Enabled, Disabled
Range: 2nd, 2nd + 5th
Range: Enabled, Disabled
Range: 0.1 to 65.0% f in steps of 0.1
0
Range: 0.05 to 600.00 s in steps of 0.01
Range: Enabled, Disabled
Range: 0.10 to 0.50 x CT in steps of
0.01
Range: Enabled, Disabled. Seen only if
Voltage Sensing is enabled.
Range: 0.50 to 0.99 x VT in steps of
0.01. Seen only if Voltage
Sensing is enabled.
Range: Logic Input 1 to 16, Disabled
Range: Logic Input 1 to 16, Disabled
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