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Answer Posted / subin
Ring main unit is used in a secondary distribution system.
It is basically used for an uninterrupted power supply.
Alongside, it also protects your secondary side transformer
from the occasional transient currents. Depending on your
applications and loading conditons you can use a swicth
fuse combination or a circuit breaker to protect the
transformer. This transformer connected to the switch fuse/
circuit breaker is called your T off. In a common
arrangement you have Load break swicthes on both the sides
of your T off. Ring main Units come in standard ratings of
11/22/33 kV, 630/1250 A, 21 KA/3 secs.
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