Relay And Current Transformers - ABB SafeRing Product Manual

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Installation of current transformers
The cable shielding is led back through the center hole
and earthed, as shown in figure.

12. RELAY AND CURRENT TRANSFORMERS

A protection relay is installed in each vacuum circuit-breaker
module. The cables from the protection relay to the current
transformers are installed from the factory and are terminated
in the cable compartment ready for connection to the three
current transformers supplied.
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Each current transformer must be mounted onto its high
voltage cable before the cable termination is fitted.
After the current transformers have been installed in the unit,
the cables from the protection relay are connected. Consult
the manual supplied with the protection relay for a description
of the connections.
SafeRing / SafePlus with vacuum circuit-breakers are
delivered with self-powered OC / EF protection relay ABB type
REJ 603 V.1,5.
Relays with auxiliary voltage
SafePlus can be delivered with advanced protection relays:
− REF615 (high LV-compartment with hinged door)
− REF630 (high LV-compartment with hinged door)
− REF611 (high LV-compartment with hinged door)
− REF620 (high LV-compartment with hinged door)
Separate manuals with examples of settings
have been prepared for each of these protection relays.
CAUTION
Before installation:
Check that the three current transformers have
been delivered and that they are all of the same
type.
Check that the current transformers are of the cor-
rect type, with the correctly rated transformer ratio,
for the distribution transformer's rated current and
for the adjustment range on the protection relay
(see protection relay manual).
WARNING
The earth shield on the cable must be led back
through the center hole in the current transformer
(see figure on left) and earthed on the earthing bar
in the cable compartment. A mounting plate for the
current transformers is fitted in the cable compart-
ment.
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