Activating The Test Mode; Preparing The Connection To The Test Equipment - ABB RET670 Commissioning Manual

Section 10
Testing IED operation
10.2
10.3
90

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withdrawn, since latches on the handle secure it in the half withdrawn position.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
1MRK 504 165-UEN A
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