The RTXH test-plug handle leads may be connected to any type of test equipment or
instrument. When a number of protection IEDs of the same type are tested, the test-plug
handle only needs to be moved from the test switch of one protection IED to the test switch
of the other, without altering the previous connections.
Use COMBITEST test system to prevent unwanted tripping when the handle is
withdrawn, since latches on the handle secure it in the half withdrawn position. In this
position, all voltages and currents are restored and any re-energizing transients are given
a chance to decay before the trip circuits are restored. When the latches are released, the
handle can be completely withdrawn from the test switch, restoring the trip circuits to the
protection IED.
If a test switch is not used, perform measurement according to the provided circuit
diagrams.
Never disconnect the secondary connection of a current transformer
circuit without first short-circuiting the transformer's secondary winding.
Operating a current transformer with the secondary winding open will
cause a massive potential build up that may damage the transformer and
cause personal injury.
5.4
Connecting the test equipment to the IED
Connect the test equipment according to the IED specific connection diagram and the
needed input and output signals for the function under test. An example of a connection
is shown in figure
.
Connect the current and voltage terminals. Pay attention to the current polarity. Make sure
that the connection of input and output current terminals and the connection of the residual
current conductor is correct. 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 IED under test.
To ensure correct results, make sure that the IED as well as the test
equipment are properly grounded before testing.
Section 5
1MRK 505 293-UUS A
Testing IED operation
40
Commissioning manual
