Putting The Ied Into Test Mode; Connecting Test Equipment To The Ied - ABB REL670 Installation And Commissioning Manual

2.3
2.4
Preparing for test
Warning!
Never disconnect the secondary connection of a current transformer circuit without short-cir-
cuiting the transformer's secondary winding. Operating a current transformer with the second-
ary winding open will cause a massive potential build up that may damage the transformer and
injure humans.

Putting the IED into test mode

The IED can be put into test mode before testing. This blocks all functions in the function test
modes folder and allows the user to unblock or release the functions needed for the test in ques-
tion. In this way, it is possible to test slower back-up measuring functions without the interfer-
ence of faster measuring functions. Test mode is indicated when the yellow LED flashes.
Procedure
1. Browse to the 'TestMode' menu and press 'E'.
The Test Mode menu is found under the Test folder in the LHMI:
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 start LED above the LCD will start flashing when the IED is
in test mode.

Connecting test equipment to the IED

Before testing, connect the test equipment according to the IED specific connection diagram.
Pay special attention to the correct connection of the input and output current terminals, and to
the connection of the residual current conductor. 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.
Chapter 11
Verifying settings by secondary
injection
75