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Rx
Tx
Fig. 3. Rear view of sensitive earth-fault relay SPAJ 111 C.
Specification of input and output terminals
Contacts
Function
25-26
Neutral current I
25-27
Neutral current I
10-11
External blocking signal (BS)
61-62
Auxiliary power supply.
When DC voltage is used the positive pole is connected to terminal 61.
65-66
Trip output 1 for stages I
68-69
Trip output 2 for stages I
80-81
Signal on tripping of stages I
77-78
Signal on tripping of stage I
73-74-75 Start of stage I
is closed. When stage I
70-71-72 Self-supervision (IRF) alarm output. Under normal conditions the contact interval
70-72 is closed. When the auxiliary voltage disappears or an internal fault is
detected, the contact interval 71-72 closes.
Protective earth terminal
The sensitive earth-fault relay SPAJ 111 C is
connected to the fibre optic data communica-
tion bus by means of the bus connection module
SPA-ZC 17 or SPA-ZC 21.
25
61
26
62
TTL
27
65
66
68
69
73
80
74
81
75
77
70
78
71
10
72
11
(I
= 5 A)
0
n
(I
= 1 A)
0
n
> and I
>> (TRIP 1)
0
0
> and I
>> (TRIP 2)
0
0
> and I
>> (SIGNAL 1)
0
0
>>, start of stages I
0
> (START 2). Under normal conditions the contact interval 73-75
0
> starts, the contact interval 74-75 closes.
0
The bus connection module is fitted to the D-
type connector (SERIAL PORT) on the rear
panel of the relay. The opto-connectors of the
optical fibres are plugged into the counter con-
nectors Rx and Tx on the bus connection mod-
ule. In the bus connection module the switches
for selection of the communication mode are to
be set in position "SPA".
> and I
>> (START 1)
0
0
5
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