ABB RELION REX640 Technical Manual page 668

Protection functions
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.
P1
P2
Figure 377: Example of connections to test the line differential protection relay
Secondary current injection
There are two alternative modes to check the operation of a line differential
protection relay. These are not exclusive methods for each other and can be used for
various test on the protection relay.
Normal mode
In normal mode, that is, the mode when the function is on normal operation, the
local end protection relay sends phasors to the remote end protection relay and
receives phasors measured by the remote end protection relay. This mode can be
668
Breakable
terminal blocks
S1
S2
A
Test device
TIMER
STOP
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