ABB SPAJ 141 C - Stage Parameters and Data Transmission

11
Overcurrent unit of SPCJ 4D24
Low-set overcurrent stage I>
Setting range 0.5...5.0 x I
n
Selectable modes of operation
- definite time operation
- operating time t> 0.05...300 s
- inverse definite minimum time (IDMT) mode
of operation as per IEC 255-4 and BS 142 Extremely inverse
Very inverse
Normal inverse
Long-time inverse
- special type inverse characteristics RI-type inverse
RXIDG-type inverse
- time multiplier k 0.05...1.0
High-set overcurrent stage I>>
Setting range 0.5...40 x I
n
and ∞
Operating time t>> 0.04...300 s
Note!
If the setting is higher than 2.5 x I
n
, the maximum continuous carry (4 x I
n
) and the levelling out
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
0
>
Setting range 1.0...25.0 % I
n
Selectable modes of operation
- definite time operation
- operating time t
0
> 0.05...300 s
High-set neutral overcurrent stage I
0
>>
Setting range 2...200 % I
n
and ∞
Operating time t
0
>> 0.05... 300 s
Data transmission
Transmission mode Fibre optic serial bus
Data code ASCII
Selectable data transfer rates 4800 or 9600 Bd
Fibre optic bus connection modules
with integral power unit
- for plastic core cables SPA-ZC 17 BB
- for glass fibre cables SPA-ZC 17 MM
Fibre optic bus connection modules
which are powered from the host relay
- for plastic core cables SPA-ZC 21 BB
- for glass fibre cables SPA-ZC 21 MM