ABB SPAJ 131 C User Manual And Technical Description page 14

14
The high-set stage operates rapidly on short
circuits on the feeder and the low-set stage
operates as back-up protection for faults occur-
ring behind the distribution transformer.
Definite time characteristic has been employed,
but it is also possible to use inverse time opera-
tion characteristic of operation. The difference
Switch SG1/SPCJ 3C3
1 0
}
t> = 0.05...1.00 s
2 0
3 0 Def. time charact.
4 0 no self-holding
5 0 no I>> doubling
6 0 I>> = 2.5...20 x I
7 0
}
t>> = 0.04...1 s
8 0
∑
0
With above switch settings the output relays of
SPAJ 131 C have the following functions:
Output relay (contact)
A (65-66)
B (68-69)
C (80-81)
D (77-78)
E (70-71-72)
between the inverse time characteristics has
been explained in example 1.
On starting the I>> stage blocks the high-set
stage of the overcurrent relay.
The selector switches of the overcurrent relay
SPAJ 131 C can be set as follows:
SGB/SPCJ 3C3
0 not in use
0 not in use
0 not in use
0 no blocking to t>
0 no blocking to t>> 0 no I>> trip to output relay C
0 not in use
n
0 not in use
0 not in use
Function
CB open (I>, I>>)
Signal on final trip (I>>)
Signal on final trip (I>)
Start of I>> stage, blocking signal to the overcurrent relay
module of the busbar system
Self-supervision alarm
SGR
0 no blocking from feeders
1 I>> start to output relay D
0 no I> start to output relay D
0 no I>> trip to output relay D
1 I>> trip to output relay A
1 I> trip to output relay C
0 no I> trip to output relay B