Selecting the internal fault test - Arc protection - Bay control and measurement - Merging unit - Operation Manual - SMU615 Substation Merging Unit - 1.0 - IEC - ANSI - 06.06.2023

SMU615 Operation Manual

The internal fault may be tested by using the WHMI via the front port. When enabling the test, the internal fault output contact is activated, the green Ready LED is flashing. See the technical manual for the internal fault output contact location. The internal fault can only be activated by using the WHMI via the front port.

Note: Differing from real internal fault situation, the other output contacts are not released and locked during the test. In other words, protection functions can operate and trip the outputs when the internal fault is tested.
  1. Click Tests in the left navigation bar and select IED test.
  2. Click Enable Write.
  3. Edit the Internal fault test parameter.
    • In the New Value list, select Test on.
    Figure 1. Internal fault test
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  4. Click Write to IED.