GE 745 Instruction Manual page 151

CHAPTER 5: SETPOINTS
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
setpoint is displayed only if
is "Enabled".
• MINIMUM ENERGIZATION VOLTAGE: Enter the voltage level below which the
transformer is considered de-energized (when
"Enabled"). This setpoint is displayed only if
VOLTAGE SENSING is "Enabled".
• BREAKERS ARE OPEN SIGNAL: Select any logic input which, when asserted, indicates
to the 745 that the transformer is de-energized. The selected logic input should be
connected to the auxiliary contacts of the transformer breaker or disconnect switch.
• PARALL XFMR BRKR CLS SIGNAL: Select any logic input which, when asserted, will
indicate to the 745 the onset of sympathetic inrush. The selected logic input should be
connected to the close command going to the parallel transformer switching device.
FIGURE 5–11: Energization inhibit scheme logic
S2 SYSTEM SETUP VOLTAGE INPUT

ENERGIZATION SENSING BY VOLTAGE
S2 SYSTEM SETUP
S4 ELEMENTS
VOLTAGE SENSING

is
VOLTAGE INPUT
 
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