Activating The Test Mode; Preparing The Connection To The Test Equipment - ABB rec670 Commissioning Manual

Section 9
Testing IED operation
9.2
9.3
70

Activating the test mode

Put the IED into the test mode before testing. The test mode blocks all protection
functions and some of the control functions in the IED, and the individual functions to
be tested can be unblocked to prevent unwanted operation caused by other functions.
In this way, it is possible to test slower back-up measuring functions without the
interference from faster measuring functions. The test switch should then be
connected to the IED.Test mode is indicated when the yellow StartLED flashes.
It is important that the IED function to be tested is put into test mode, even if the MU
is sending data marked as "test". The IED will interpret these data as valid if it is not
in test mode.
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 On 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 startLED above the LCD will start flashing when the IED is in test
mode.

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 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.
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withdrawn, since latches on the handle secure it in the half withdrawn position.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
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