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I N S TA L L AT I O N A N D O P ER AT I N G I N S T R U C T I O N S
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12. Protection
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 to the three current
transformers.
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
correct 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).
Relays with auxiliary voltage
SafeRing XT/SafePlus XT with vacuum circuit-breakers are
delivered with self-powered relays
Wide range of relays are available with wide range of
auxiliary power supply. Refer Separate manuals with
examples of settings for each of these protection relays.
