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Connections
The biased differential relay SPAD 330 C has
the following inputs and outputs.
The differential relay SPAD 330 C is provided
for being connected to the fibre-optic SPA data
bus. The connection is performed by using a
SPA-ZC series bus interface module, which is
to be attached to the 9-pole D-type subminiature
connector located in the centre of the rear
panel of the relay unit. The screws required are
included in the delivery of the optional bus
interface module. The terminals of the fibre-
Fig. 4. Rear view of the biased differential relay SPAD 330 C.
6
Terminal No.
Function
1-2
Phase current I
1-3
Phase current I
4-5
Phase current I
4-6
Phase current I
7-8
Phase current I
7-9
Phase current I
13-14
Phase current I
13-15
Phase current I
16-17
Phase current I
16-18
Phase current I
19-20
Phase current I
19-21
Phase current I
61-62
Auxiliary voltage supply. The positive lead of the dc supply is
to be connected to terminal 61. The auxiliary voltage range is
marked on the front panel.
63
Protective earth
65-66
CB tripping contact
68-69
CB tripping contact
73-74-75
Signalling contact
76-77-78
Signalling contact
70-71-72
Self-supervision alarm contact. Under normal service conditions
the relay is energized and the contact gap 70-72 is closed.
When a fault occurs or the auxiliary voltage is interrupted,
the contact gap 71-72 closes.
of the HV side (5 A)
L1
of the HV side (1 A)
L1
of the HV side (5 A)
L2
of the HV side (1 A)
L2
of the HV side (5 A)
L3
of the HV side (1 A)
L3
of the LV side (5 A)
L1
of the LV side (1 A)
L1
of the LV side (5 A)
L2
of the LV side (1 A)
L2
of the LV side (5 A)
L3
of the LV side (1 A)
L3
optic cables are connected to the counter
terminals Rx and Tx on the bus interface
module. The fibre-optic cables are linked from
one protection relay to the other and to the
control data communicator. The type desig-
nations of the bus interface modules and
fibre-optic cables are found in the document
34 SPA 12 EN1 "Characteristics of fibre-optic
cables and instructions for mounting".
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