ABB RELION RET670, Commissioning Manual, Page: 98 / 328

1. Browse to the TESTMODE menu and press E .
The TESTMODE menu is found on the local HMI under Main menu/Test/IED
test mode/TESTMODE
2. Use the up and down arrows to choose Enabled and press E .
3. Press the left arrow to exit the menu.
The dialog box
Save changes appears.
4. Choose Yes , press E and exit the menu.
The yellow pickupLED above the LCD will start flashing when the IED is in test
mode.
10.3 Preparing the connection to the test equipment
The IED can be equipped with a test switch of type RTXP8, RTXP18 or RTXP24 or FT.
The test switch and its associated test plug handles are a part of the COMBITEST or FT
system of ABB, 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 CTs,
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. When FT switch is used for testing, care shall be exercised to open the tripping
circuit, ahead of manipulating the CT fingers.
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withdrawn, since latches on the handle secure it in the half withdrawn position.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handle can be completely withdrawn from the test switch, restoring the trip circuits to the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
Section 10
1MRK 504 165-UUS -
Testing IED operation
92 Transformer protection RET670 2.2 ANSI
Commissioning manual