ABB RELION REX640 - Page 1412

Table 1343: Correlation algorithm for detecting fueling faults
Type of fault Governor mode Fault detection criteria Output
activation
Over fueling
fault
GOV_MOD_ISOC =
TRUE
F > ( Expected frequency + Max Freq
Dev Isoc )
AND
Local active power (P) > MAX(P1, P2, …
P8) + Max P Dev Crl
Note: Only generators within the same
subnetwork are considered for com-
parison.
OV_FUEL_FLT
GOV_MOD_DRP =
TRUE
F > F set point no load – (( Frequency
droop *0.01) * P) + Max Freq deviation
GOV_MOD_CDRP =
TRUE
F > F_CALC_LIMIT + Max Freq devia-
tion
GOV_MOD_BASE =
TRUE
P > BASE_P_SET + Max P Dev Crl
Under fueling
fault
GOV_MOD_ISOC =
TRUE
F < ( Expected frequency - Max Freq
Dev Isoc )
AND
P < MIN(P1, P2, … P8) - Max P Dev Crl
Note: Only generators within the same
subnetwork are considered for com-
parison.
UN_FUEL_FLT
GOV_MOD_DRP =
TRUE
F < F set point no load - (( Frequency
droop *0.01) * P) - Max Freq deviation
GOV_MOD_CDRP =
TRUE
F < F_CALC_LIMIT - Max Freq deviation
GOV_MOD_BASE =
TRUE
P < BASE_P_SET - Max P Dev Crl
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 Disable Fuel voting . Table 1344
shows the method of detecting fueling faults using the voting algorithm.
Condition monitoring functions
1MRS759142 F
1412 REX640
Technical Manual