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You can use the Blk. by meas.-volt. failure parameter to control the response of the stage when a
measuring-voltage failure is detected.
A measuring-voltage failure can only be detected if one of the following 2 conditions is met:
•
The device-internal Measuring-voltage failure detection function is configured and switched on.
•
The binary input signal
the voltage-transformer circuit breaker.
Parameter Value
yes
no
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
>Open of the function block Voltage-transformer circuit breaker is connected to
Description
The directional overcurrent-protection stage is blocked when a measuring-
voltage failure is detected. Siemens recommends using the default setting,
as correct direction determination cannot be guaranteed if a measuring-
voltage failure occurs.
The directional overcurrent-protection stage is not blocked when a meas-
uring-voltage failure is detected.
Protection and Automation Functions
6.7 Directional Overcurrent Protection, Ground
449
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