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Control During Operation
7.2.4
Test Mode of the Signal Transmission (optional)
7-38
Figure 7-39
Example: Transfer Block Activated in DIGSI
Click on Block Data Transmission to activate or deactivate the transfer block.
After entry of Password No. 4 for test and diagnostics, and confirmation with OK , the
setting change is complete.
Activation is indicated with a check mark in front of the command.
Follow the same procedure for the command Test Mode , if this option is desired.
Note:
Remember to change the settings for Block Data Transmission and Test Mode back
to the desired, in-service settings (both typically OFF ) when the tests are complete.
If a protection data interface is provided, the "local test mode" can be selected for re-
vision or commissioning of the teleprotection schemes.
This enables the operation of the signal transmission via the protection data interface
to be tested as follows:
A fault case is simulated in the local device generating the corresponding transmission
signals. The signals are transmitted to the opposite line end with the added message
"Test Mode". The signals received at the opposite line end are mirrored, i.e. they are
sent back phase segregated from the opposite line end as own signals marked with
"Test Mode". The local device receives these mirrored test signals and adds them to
its own teleprotection scheme which can use these signals to generate a trip signal if
necessary. No tripping occurs in the devices as the signals have the message "Test
Mode" attached to them and are thus recognized as not relevant for protection purpos-
es.
For mode changeover Password No. 2 is required (for switching/tagging/manual over-
writing). Every mode that has been changed is stored in the device safe from an aux-
iliary voltage failure.
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7SA6 Manual
C53000-G1176-C156-2
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