Table 268:
Calculation of the FLS_BLOCK and BLK_BYPASS outputs
Load-shedding blocking
conditions
Block override setting
BLK_BYPASS output
FLS_BLOCK output
IED_TST_MODE =
TRUE
IED test mode
All yes
TRUE
FALSE
No
Quality bad CB close
Quality bad CB open
CB Interm or invalid
FALSE
TRUE
CB_IED_QVAL = Bad
Quality bad CB close
Quality bad CB Open
All yes
TRUE
FALSE
No
IED test mode
CB Interm or invalid
FALSE
TRUE
CB_POSITION =
Intermediate or Invalid
CB Interm or invalid
All yes
TRUE
FALSE
No
IED test mode
Quality bad CB close
Quality bad CB open
FALSE
TRUE
If mutiple load-
shedding blocking
signals are active
simultaneously
(IED_TST_MODE =
TRUE, CB_IED_QVAL
= Bad, CB_POSITION
= Intermediate or
Invalid)
All yes
TRUE
FALSE
CB Interm or invalid
IED test mode
Quality bad CB close
Quality bad CB open
TRUE
TRUE
No
FALSE
TRUE
The
Block override
setting is preferred to be kept as “No”.
If the input
ISLAND_PARAL
is “Parallel” and the compensated circuit breaker status
is TRUE, the output
ISLND_PARALL
is “Parallel”, else the output
ISLND_PARALL
is “Island”.
For generator, the output
ISLND_PARALL
remains “Island”.
The output
B_SET_CHANGE
remains active for 500 ms if one or more basic settings
). After 500 ms, the output
B_SET_CHANGE
is FALSE.
The General logic module provides the
FLS_BLOCK
(load-shedding blocking),
ISLND_PARALL
(island or parallel mode) and
CB_COMPS_POS
(compensated
circuit breaker status) signals to the Binary to integer module.
1MRS757256 F
Section 7
Power management functions
PML630/Compact Load-Shedding Solution
221
Technical Manual
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