Protection Engineering Basics and Schemes Protection Engineering | Page 64

long distance type) , relay and breakers in any switchgear
have significant length of distance , and to make
operation smooth we uses auxiliary relay to make breaker
on and off.
In below drawing you can see multiple auxiliary relays
Here you see, they named auxiliary relays by particular
code (1K series), it is connected via Test Switch (TS1) so it
is also a trend, and this drawing is binary module of under
frequency relay panel. You can see Micom P139 relay,
these are connected to binary terminal and give status to
or take signal from the relay in digital form.
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