Accidental Energization (50/27) - GE Multilin G650 Manual

5 SETTINGS
This element provides a protection against the generator energization while the generator is at standstill or reduced speed.
This function is armed using either the AND or OR combination of the undervoltage and machine off-line conditions,
selected with the ACCDNT ENGR ARMING MODE setting.
Once armed, the accidental energization feature operates upon detecting an overcurrent condition in any of the stator
phases.
Table 5–98: ACCIDENTAL ENERGIZATION ELEMENT SETTINGS
SETPOINT > CONTROL ELEMENTS > ACCIDENTAL ENERGIZATION >
ACCIDENTAL ENERGIZATION 1> ACCIDENTAL ENERGIZATION 2 > ACCIDENTAL ENERGIZATION 3
SETTING DESCRIPTION
Function Permission
Arming mode for Accidental Energization
Overcurrent Level to operate
Arming undervoltage value
Snapshot Event generation
• Function: This setting allows enabling or disabling the accidental energization element.
• Accdnt Enrg Mode: This setting specifies whether the element gets armed by either of the undervoltage or machine
off-line conditions ('UV or Off-line' value), or by both the conditions ('UV and Off-line' value). In both cases the element
is armed after the conditions are maintained during 5 seconds.
• Overcurrent pickup: This setting defines the current level required to operate the armed Accidental energization.
GEK-113285A
Figure 5–24: LOSS OF EXCITATION LOGIC SCHEME
NAME
Function
Accdnt Enrg Mode
Overcurrent pickup
Ph Undervoltage
pickup
Snapshot Events
G650 Generator Protection & Control System

5.5.12 ACCIDENTAL ENERGIZATION (50/27)

DEFAULT VALUE STEP
DISABLED N/A
UV AND OFF-LINE N/A
1.50 0.01 A
40.00 0.01 V
ENABLED N/A
5.5 CONTROL ELEMENTS
RANGE
[DISABLED – ENABLED]
[UV AND OFF-LINE – UV OR
OFF-LINE]
[0.00 : 160.00]
[0.00 : 500.00]
[DISABLED – ENABLED]
5-101
5