Accidental Energization (Ansi 50/27) - GE G60 Instruction Manual

CHAPTER 5: SETTINGS

5.7.15 Accidental energization (ANSI 50/27)

SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  ACCIDENTAL ENERGIZATION
 ACCIDENTAL
 ENERGIZATION
This element provides protection against energization while the generator is at standstill or reduced speed. The feature is
armed using either the AND or OR combination of the undervoltage and machine offline conditions, selected with the
setting (see below). The undervoltage condition is determined from the measured voltages.
ACCDNT ENRG ARMING MODE
The machine offline status is indicated by a dedicated FlexLogic operand. Once armed, the accidental energization feature
operates upon detecting an overcurrent condition in any of the stator phases.
This feature can also provide protection against poor synchronization.
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 5-157: 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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