ABB SPAJ 140 C User Manual And Technical Description page 11

Overcurrent unit of SPCJ 4D29
Low-set overcurrent stage I> *
Start current **
- at definite time characteristic
- at inverse time characteristic ***
Time/current characteristic
- definite time characteristic
- operate time t>
- inverse definite minimum time (IDMT)
characteristic as per IEC 60255-3 and BS 142
- special type inverse characteristic
- time multiplier k
High-set overcurrent stage I>> *
Start current
Operate time t>>
Earth-fault unit of SPCJ 4D29
Low-set earth-fault stage I
Start current
Time/current characteristic
- definite time characteristic
- operate time t >
0
- inverse definite minimum time (IDMT)
characteristic as per IEC 60255-3 and BS 142
- special type inverse characteristic
- time multiplier k
0
High-set earth-fault stage I
Start current
Operate time t >>
0
* Note!
The operation of the low-set stage based on
inverse time characteristic will be blocked by
starting of the high-set stage. Then the operate
time of the overcurrent unit is determined by
the set operate time of the high-set stage at heavy
fault currents. In order to obtain a trip signal,
the high-set stage must be routed to a trip output
relay.
> *
0
>> *
0
0.5...5.0 x I
0.5...2.5 x I
0.05...300 s
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
RI-type inverse
RXIDG-type inverse
0.05...1.0
0.5...40 x I
0.04...300 s
0.1...0.8 x I
0.05...300 s
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
RI-type inverse
RXIDG-type inverse
0.05...1.0
0.1...10.0 x I
0.05... 300 s
** Note!
If the set start current exceeds 2.5 x I
maximum continuous carry of the energizing
inputs (4 x I ) must be noted.
n
*** CAUTION!
Never use start current settings above 2.5 x I
inverse time operation although allowed by the
relay.
n
n
and ∞, infinite
n
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and ∞, infinite
n
, the
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at
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