Preparing The Connection To The Test Equipment; Connecting Test Equipment To The Ied - ABB RELION 630 Series Comissioning Manual

1MRS756801 E
4.3
4.4
630 series
Commissioning Manual

Preparing the connection to the test equipment

The IED can be equipped with a test switch of type RTXP8, RTXP18 or RTXP24. The
test switch and its associated test plug handle (RTXH8, RTXH18 or RTXH24) are a
part of the COMBITEST system, which provides secure and convenient testing of the
IED.
• When using the COMBITEST, preparations for testing are automatically carried
out in the proper sequence, that is, for example, blocking of tripping circuits, short
circuiting of CT's, opening of voltage circuits, making IED terminals available
for secondary injection. Terminals 1 and 8, 1 and 18 as well as 1 and 12 of the test
switches RTXP8, RTXP18 and RTXP24 respectively are not disconnected as
they supply DC power to the protection IED.
• 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withdrawn, since latches on the handle secure it in the half withdrawn position.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the latches are released, the handle can be completely withdrawn from the test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.

Connecting 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.
• 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.
Section 4
Testing IED operation
25