33
Feeder terminal SPAC 531 C1 used for the
protection of an outgoing feeder in a one-breaker
system. The earth-fault protection has a signal-
ling function only.
In this application (Fig. 11) the earth-fault
protection has a signalling function only. In
such a case the auto-reclose functions can be
started in the normal way also by the directional
earth-fault relay module. The starting time (e.g.
parameters S25 and S35) of the auto-reclose
unit should be 200 ms + CB operate time t
cb
shorter than the time delay preceding final trip-
ping. At the end of the auto-reclose sequence a
signal for earth fault is received and the start of
another auto-reclose sequence is prevented.
The start of low-set stage of the directional
earth-fault relay module produces a signal over
the contact X2/7-8-9. After the operate time t>
an alarm signal is received over the contact X2/
1-2-3. In such a case the SGR/3 switch of the
I/O module must be in position 0. Selection of
the starting value
∞
, infinite, sets the high-set
stage of the directional earth-fault relay module
totally out of operation.
The switches on the PC boards of the relay
modules have to be set as follows:
Example 3.
Contact
Function
X1/3-4
Opening 1 of CB (I>, I>>)
X1/6-7
Signal for final trip (I> or I>>)
X2/1-2-3
I
ϕ
> alarm signal
X2/4-5-6
I>> start and blocking signal to phase overcurrent modules of incoming
feeder cubicle
X2/7-8-9
I
ϕ
> start
X1/8-9-10
Self-supervision alarm (IRF)
X3/11-12
Opening 2 of CB (local control, remote control, AR)
X3/13-14
CB closing
The AR parameters can be set as shown in example 1.
With the I
ϕ
>> setting
∞
, infinite, and above
SGB and SGR switch settings the output con-
tacts of feeder terminal SPAC 531 C1 have the
following functions:
Switch
SGB/SPCJ 3C3
SGB/SPCS 3C4
SGR
1
1 I> start to AR2
1 I
ϕ
> start to AR3
0 no I> start to SIGNAL 3
2
0 no I>> start to AR2
0 no I
ϕ
>> start to AR3
1 I> and I>> trip to
SIGNAL 1
3
1 I>> start to AR1
0 no I
ϕ
>> start to AR1
0 no I
ϕ
> trip to TRIP
output
4
0 no block. BS 1 to t>
0 no block. BS 1 to t>
0 not in use
5
0 no block. BS 1 to t>> 0 no block. BS 1 to t>>
0 not in use
6
0 no block. BS 2 to t>
0 no block. BS 2 to t>
0 not in use
7
0 no block. BS 2 to t>> 0 no block. BS 2 to t>> 0 no TRIP sign. to
SIGNAL 1
8
0 not in use
0 not in use
0 no TRIP sign. to
SIGNAL 2