ABB SPAC 536 C User Manual page 27

Combined overcurrent and earth-fault module SPCJ 4D24
Low-set overcurrent stage I>
Start current I>, setting range
Seletable modes of operation
- definite time operation
- operate time t>
- inverse definite minimum time (IDMT)
acc. to IEC 60255-3 and BS 142
- time multiplier k
- special type inverse characteristics
High-set overcurrent stage I>>
Start current I>>
Operate 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!
When the high-set stage starts the operation of the low-set stage is blocked, which means that on
heavy fault currents the definite time high-set stage operates rather than the IDMT low-set stage.
Thus the operate time is determined by the t>> setting when the fault current exceeds the I>> setting.
A precondition for the tripping of the I>> stage is that the output signal has been routed to the TRIP
output.
Low-set neutral overcurrent stage I
Start current I >
0
Operate time t >
0
High-set neutral overcurrent stage I
Start current I >>
0
Operate time t >>
0
Directional earth-fault relay module SPCS 3C4
Low-set stage Iϕ>
Start current Iϕ>
Selectable modes of operation
Operate time t>
High-set stage Iϕ>>
Start current Iϕ>>
Selectable modes of operation
Operate time t>>
Start level of the neutral displacement voltage U
- selectable values
, the maximum continuous carry (3 x I
n
>
0
>>
0
>
0
0.5...5.0 x I
n
0.05...300 s
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
0.05...1.00
RI type inverse
RXIDG type inverse
and ∞, infinite
0.50...40.0 x I
n
0.04...300 s
) and the levelling out
n
1.0...25.0 % of I
n
0.05...300 s
and ∞, infinite
2.0...200 % of I
n
0.05...300 s
1.00...10.0% x I
n
I sinϕ or I cosϕ
0 0
0.10...10.0 s
and ∞, infinite
1.00...40.0% I
n
I sinϕ or I cosϕ
0 0
0.10...1.00 s
2%, 5%, 10% or 20% of U
n
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