ABB SPAC 315 C User Manual And Technical Description page 22

22
Combined overcurrent and earth-fault module SPCJ 4D29
Phase overcurrent unit
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 255-4 and BS 142
- special type inverse characteristic
- time multiplier k
High-set overcurrent stage I>> *
Start current
Operate time t>>
Earth-fault unit
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 255-4 and BS 142
- special type inverse characteristic
- time multiplier k
0
High-set earth-fault stage I
Start current
Operate time t >>
0
* Note!
When the high-set overcurrent stage I>> starts the operation of the low-set overcurrent stage I> is
inhibited. Consequently, the operate time of the relay equals the set operate time t>> at any fault
current level over the set start current I>>. In order to obtain a trip signal, the high-set overcurrent
stage I>> must be routed to a trip output relay.
** Note!
If the set start current exceeds 2.5 x I
(4 x I ) must be noted.
n
*** CAUTION!
Never use start current settings above 2.5 x I
relay.
**** Note!
When the high-set earth-fault stage I
inhibited. Consequently, the operate time of the relay equals the set operate time t
current level over the set start current I
stage I >> must be routed to a trip output relay.
0
> ****
0
>> ****
0
, the maximum continuous carry of the energizing inputs
n
at inverse time operation although allowed by the
n
>> starts the operation of the low-set earth-fault stage I
0
>>. In order to obtain a trip signal, the high-set earth-fault
0
0.5...5.0 x I
n
0.5...2.5 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 ∞, infinite
0.5...40 x I
n
0.04...300 s
0.1...0.8 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 ∞, infinite
0.1...10.0 x I
n
0.05... 300 s
> is
0
>> at any fault
0