Accidental Energization (Ansi 50/27) - GE G30 Instruction Manual

CHAPTER 5: SETTINGS
If the VTs are located on the HV side of the transformer, then the source should be configured using CTs that are
also on the HV side. Correspondingly, if the VTs are located on the LV side of the transformer, then the source should
be configured using CTs that are also on the LV side. In both cases, the CT polarity should produce a positive power
measurement when the machine is generating.
The element responds to the positive sequence impedance as shown in the logic diagram.

5.7.12 Accidental energization (ANSI 50/27)

SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  ACCIDENTAL ENERGIZATION
 ACCIDENTAL
 ENERGIZATION
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 5-129: Loss of excitation logic
ACCDNT ENRG

FUNCTION: Disabled
ACCDNT ENRG SOURCE:

SRC 1
ACCDNT ENRG ARMING

MODE: UV and Offline
ACCDNT ENRG OC

PICKUP: 0.300 pu
ACCDNT ENRG UV

PICKUP: 0.500 pu
ACCDNT ENRG OFFLINE:

Off
ACCDNT ENRG BLOCK:

Off
ACCDNT ENRG TARGET:

Self-reset
ACCDNT ENRG EVENTS:

Disabled
GROUPED ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: UV and Offline, UV or Offline
Range: 0.020 to 3.000 pu in steps of 0.001
Range: 0.004 to 3.000 pu in steps of 0.001
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
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