In the front of the block will be identified by two tag (upper and lower) and in the back will be
associated with the front by Labels with the same legend, where those that are within a circle
will correspond to the field part and those not to the relay part. As a mnemonic rule, the idea of
© circle Field can be used.
Closed Circuit
In normal state the test block circuits are closed contacts.
While the field terminals (identified by numbers inside
circles) connected to transformers and the equipment
(Protection) terminals connected to the equipment.
Open Circuit
The opening of circuits is achieved inserting the
test plug inside the test block. With this
maneuver the field and protection circuits are
pull apart.
Opening sequence (Test Plug Insertion)
During the insertion of the test plug the circuits are ready to be able to test the protection relay,
according to the next ordered sequence:
1. Opening of the trip circuits and signal.
2. Shorting current transformers circuits
3. Open voltage and current circuit.
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