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The
FLS_BLOCK
output provides the load-shedding blocking signal after
considering the override action using the
Block override
setting. The
BLK_BYPASS
output indicates the successful overridden action of the load-shedding blocking
signal.
Table 294:
Calculation of FLS_BLOCK and BLK_BYPASS outputs for bus coupler configuration
CB Configuration
setting
Load-shedding blocking conditions
Block override setting
BLK_BYPASS
output
FLS_BLOCK output
Bus coupler
SND_IED_TEST = TRUE
IED test mode
All yes
TRUE
FALSE
No
Quality bad CB close
Quality bad CB open
CB Interm or invalid
FALSE
TRUE
Bus coupler
SND_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
Bus coupler
SND_CB_POS = 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
Bus coupler
If multiple load-shedding blocking signals
(SND_IED_TEST = TRUE , SND_IED_QVAL =
Bad, SND_CB_POS = Intermediate or Invalid)
are active simultaneously
All yes
TRUE
FALSE
CB Interm or invalid
IED test mode
Quality bad CB close
Quality bad CB open
TRUE
TRUE
No
FALSE
TRUE
Table 295:
Calculation of FLS_BLOCK and BLK_BYPASS outputs for tie breaker configuration
CB Configuration
setting
Load-shedding blocking conditions
Block override setting
BLK_BYPASS
output
FLS_BLOCK output
Tie breaker
SND_IED_TEST = TRUE
RCV_IED_TEST = TRUE
IED test mode
All yes"
TRUE
FALSE
No
Quality bad CB close
Quality bad CB open
CB Interm or invalid"
FALSE
TRUE
Tie breaker
SND_IED_QVAL = Bad
RCV_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
Table continues on next page
1MRS757256 F
Section 7
Power management functions
PML630/Compact Load-Shedding Solution
257
Technical Manual
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