ABB SPAJ 141 C User Manual And Technical Description page 11

Overcurrent unit of SPCJ 4D24
Low-set overcurrent stage I>
Setting range
Selectable modes of operation
- definite time operation
- operating time t>
- inverse definite minimum time (IDMT) mode
of operation as per IEC 255-4 and BS 142
- special type inverse characteristics
- time multiplier k
High-set overcurrent stage I>>
Setting range
Operating time t>>
Note!
If the setting is higher than 2.5 x I
of the IDMT-curves at high current levels must be noted.
Note!
The high-current end of any inverse time characteristic is determined by the high-set stage which,
when started, inhibits the low-set stage operation. The trip time is thus equal to the set t>> for any
current higher than I>>. In order to get a trip signal, the stage I>> must also of course be linked to
a trip output relay.
Earth-fault unit of SPCJ 4D24
Low-set neutral overcurrent stage I
Setting range
Selectable modes of operation
- definite time operation
- operating time t >
0
High-set neutral overcurrent stage I
Setting range
Operating time t >>
0
Data transmission
Transmission mode
Data code
Selectable data transfer rates
Fibre optic bus connection modules
with integral power unit
- for plastic core cables
- for glass fibre cables
Fibre optic bus connection modules
which are powered from the host relay
- for plastic core cables
- for glass fibre cables
, the maximum continuous carry (4 x I
n
>
0
>>
0
0.5...5.0 x I
n
0.05...300 s
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
RI-type inverse
RXIDG-type inverse
0.05...1.0
and ∞
0.5...40 x I
n
0.04...300 s
) and the levelling out
n
1.0...25.0 % I
n
0.05...300 s
and ∞
2...200 % I
n
0.05... 300 s
Fibre optic serial bus
ASCII
4800 or 9600 Bd
SPA-ZC 17 BB
SPA-ZC 17 MM
SPA-ZC 21 BB
SPA-ZC 21 MM
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