ABB RELION REX640 Technical Manual page 585

1MRS759142 C
REX640
Technical Manual
Always check the binary output circuits from the protection relay to the equipment
interface to make sure that all signals are connected correctly. If a particular output
needs to be tested, the corresponding wiring can be disconnected from the terminal of
the protection relay during testing. Check all the connected signals so that both load
and polarity are in accordance with the protection relay specifications. However,
attention must be paid to the electrical safety instructions.
Checking of optical connections
Check that the Tx and Rx optical connections are correct.
A relay equipped with optical connections requires a minimum depth
of 180 mm for plastic fiber cables and 275 mm for glass fiber cables.
Check the allowed minimum bending radius from the optical cable
manufacturer.
Applying of required settings for the protection relay
Download all calculated settings and measurement transformer parameters in the
protection relay.
Connecting of test equipment to the protection relay
Before testing, connect the test equipment according to the protection relay specific
connection diagram.
Pay attention to the correct connection of the input and output current terminals.
Check that the input and output logical signals in the logic diagram for the function
under test are connected to the corresponding binary inputs and outputs of the
protection relay. Select the correct auxiliary voltage source according to the power
supply module of the protection relay. Select the correct auxiliary voltage source
according to the power supply module of the protection relay.
Section 4
Protection functions
579