GEK-113285A G650 Generator Protection & Control System 5-101
5 SETTINGS 5.5 CONTROL ELEMENTS
5
Figure 5–24: LOSS OF EXCITATION LOGIC SCHEME
5.5.12 ACCIDENTAL ENERGIZATION (50/27)
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
• 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.
SETPOINT > CONTROL ELEMENTS > ACCIDENTAL ENERGIZATION >
ACCIDENTAL ENERGIZATION 1> ACCIDENTAL ENERGIZATION 2 > ACCIDENTAL ENERGIZATION 3
SETTING DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function Permission Function DISABLED N/A [DISABLED – ENABLED]
Arming mode for Accidental Energization Accdnt Enrg Mode UV AND OFF-LINE N/A [UV AND OFF-LINE – UV OR
OFF-LINE]
Overcurrent Level to operate Overcurrent pickup 1.50 0.01 A [0.00 : 160.00]
Arming undervoltage value Ph Undervoltage
pickup
40.00 0.01 V [0.00 : 500.00]
Snapshot Event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
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