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Blocking of signals during test (BST) Chapter 3
Common functions
7 Blocking of signals during test (BST)
7.1 Application
The protection and control terminals have a complex configuration with many included func-
tions. To make the testing procedure easier, the terminals include the feature to individually
block a single, several or all functions.
This means that it is possible to see when a function is activated or trips. It also enables the user
to follow the operation of several related functions to check correct functionality and to check
parts of the configuration etc.
The Release Local for line differential function is only possible to operate if the terminal has
been set in test mode from the HMI.
7.2 Function block
7.3 Input and output signals
Table 67: Input signals for the Test (TEST-) function block
Path in local HMI: ServiceReport/Functions/Test
Table 68: Output signals for the Test (TEST-) function block
TEST-
TEST
INPUT ACTIVE
en01000074.vsd
Signal Description
INPUT Sets terminal in test mode when active
Signal Description
ACTIVE Terminal in test mode
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