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8.8.2
Functionality
Inadvertent or accidental energizing of off-line generators has occurred often enough due
to operating errors, breaker head flashovers, control circuit malfunctions, or a
combination of these causes. Inadvertently energized generator operates as induction
motor drawing a large current from the system. The voltage supervised overcurrent
protection is used to protect the inadvertently energized generator.
Accidental energizing protection for synchronous generator (AEGGAPC, 50AE) takes
the maximum phase current input from the generator terminal side or generator neutral
side and maximum phase to phase voltage inputs from the terminal side. AEGGAPC
(50AE) is enabled when the terminal voltage drops below the specified voltage level for
the preset time.
8.8.3
Function block
ANSI09000783-1-en.vsd
AEGGAPC (50AE)
I3P*
V3P*
BLOCK
BLKTR
TRIP
RI
ARMED
ANSI09000783 V1 EN
Figure 119:
AEGGAPC (50AE) Function block
8.8.4
Signals
Table 135:
AEGGAPC (50AE) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three Phase Current input
U3P
GROUP
SIGNAL
-
Three Phase Voltage input
BLOCK
BOOLEAN
0
Block of function
BLKTR
BOOLEAN
0
Block of trip
Table 136:
AEGGAPC (50AE) Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip signal from inadvertant energization protection
START
BOOLEAN
Pick up from inadvertant energization
ARMED
BOOLEAN
True when accidental energizing protection is armed
Section 8
1MRK 502 048-UUS A
Current protection
262
Technical manual
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