31
5.
Connections
Connection terminals are described in the Technical Reference Manual. Each
contact has its own identification number, X2.1, for instance. The numbering
of the contacts runs from top to bottom, except connectors X2.1, X5.5 and
X5.8 which are numbered from bottom to top; see Fig. 5.2.-1 and Fig. 5.2.-3.
Terminal blocks of screw-compression and ring-lug type are used for
electrical connections. Transceivers of snap-in type (X5.3) are used for plastic
fibre-optic connections and transceivers of ST-type (X5.4) for glass fibre-
optic connections.
Lens sensor inputs (X5.1 and X5.2) are used for arc protection (REF 610
only), see Fig. 5.2.-2.
If terminals of screw-compression type are used:
1. Open the screw terminal before inserting a wire into it for the first time. To
open the screw terminal, turn the fixing screw anti-clockwise until the
terminal hole is wide open (the inside of the terminal hole is surrounded
by metal).
2. Insert the wire and turn the fixing screw clockwise until the wire is firmly
fixed.
Only use screwdriver and insert bits for Phillips (PH 1) cross-recessed head
screws (M3.5) when handling CT/VT terminals (X2.1) of screw-compression
type.
A)
B)
C)
MAX 5 mm
MIN 15 mm
D)
MAX 5.5 mm
A040184
Fig. 5.-1
Screwdriver and insert bits for CT/VT terminals of screw-compression type
It is also possible to use terminals of ring-lug type for the CTs/VTs. If using
terminals of ring-lug type:
1. Open the lid that covers the ring-lug fixing screw (every fixing screw has
its own lid) with the tip of a screwdriver.
2. Screw off the screw, slide it through the terminal lug and screw it back on.
3. Close the lid.
1MRS752265-MUM
Protection Relay
Installation Manual
RE_ 610
