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
To Next Page
Loading...
