Protection Engineering Basics and Schemes Protection Engineering | Page 145

Circuit Diagram:
It is just like that, when
Connected to test
block, but when in test
mode means test block
cover remove and plug
inserted then the
associated normally
closed contacts of test
block will be in
break/open position.
In this diagram we
wired our relay with
test block from 2,4,6,8,10,12,16 and 18 test block out
puts, but usually relay connected via 22, 24, 26 and 28 in
Star connection style.
Usually test blocks are in market with covers,
pg. 145