ABB RELION REX640 Technical Manual page 1412

Condition monitoring functions
Table 1343: Correlation algorithm for detecting fueling faults
Type of fault
Over fueling
fault
Under fueling
fault
Voting algorithm:
Voting algorithm is applied to groups of generators running in parallel. Voting
algorithm compares the behavior of the local generator with rest of the generators
in the connected network and if the load on local generator deviates excessively
from the others, it is identified as faulty.
The algorithm needs minimum three generators (including the local generator)
running in parallel.
The algorithm can be disabled through the setting
shows the method of detecting fueling faults using the voting algorithm.
1412
Governor mode Fault detection criteria
GOV_MOD_ISOC =
F > (
TRUE
Dev Isoc )
AND
Local active power (P) > MAX(P1, P2, ...
P8) +
Note: Only generators within the same
subnetwork are considered for com-
parison.
F set point no load – (( Frequency
GOV_MOD_DRP = F >
droop *0.01) * P) + Max Freq deviation
TRUE
GOV_MOD_CDRP = F > F_CALC_LIMIT +
tion
TRUE
GOV_MOD_BASE = P > BASE_P_SET +
TRUE
GOV_MOD_ISOC =
F < (
TRUE
Dev Isoc )
AND
P < MIN(P1, P2, ... P8) -
Note: Only generators within the same
subnetwork are considered for com-
parison.
F set point no load - (( Frequency
GOV_MOD_DRP = F <
droop *0.01) * P) - Max Freq deviation
TRUE
GOV_MOD_CDRP = F < F_CALC_LIMIT -
TRUE
GOV_MOD_BASE = P < BASE_P_SET -
TRUE
Expected frequency + Max Freq
Max P Dev Crl
Max Freq devia-
Max P Dev Crl
Expected frequency - Max Freq
Max P Dev Crl
Max Freq deviation
Max P Dev Crl
Disable Fuel voting .
1MRS759142 F
Output
activation
OV_FUEL_FLT
UN_FUEL_FLT
Table 1344
REX640
Technical Manual