A criterion based on delta current and delta voltage measurements can be added to the
fuse failure supervision function in order to detect a three phase fuse failure, which in
practice is more associated with voltage transformer switching during station operations.
9.1.3
Function block
ANSI08000220-1-en.vsd
SDDRFUF
I3P*
V3P*
BLOCK
52A
MCBOP
89B
BLKZ
BLKV
3PH
DLD1PH
DLD3PH
ANSI08000220 V1 EN
Figure 57:
SDDRFUF function block
9.1.4
Signals
Table 83:
SDDRFUF Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three phase group signal for current inputs
V3P
GROUP
SIGNAL
-
Three phase group signal for voltage inputs
BLOCK
BOOLEAN
0
Block of function
52a
BOOLEAN
0
Active when circuit breaker is closed
MCBOP
BOOLEAN
0
Active when external Miniature Circuit Breaker opens
protected voltage circuit
89b
BOOLEAN
0
Active when line disconnect switch is open
Table 84:
SDDRFUF Output signals
Name
Type
Description
BLKZ
BOOLEAN
Start of current and voltage controlled function
BLKV
BOOLEAN
General pickup
3PH
BOOLEAN
Three-phase pickup
DLD1PH
BOOLEAN
Dead line condition in at least one phase
DLD3PH
BOOLEAN
Dead line condition in all three phases
Section 9
1MRK 505 277-UUS C
Secondary system supervision
146
Technical Manual
Summary of Contents for REB650
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