Emergency Mode (Advanced Stage)
You use the Emergency mode parameter to define whether the stage operates as emergency overcurrent
protection or as backup overcurrent protection. With the setting Emergency mode = caused by main
prot., emergency overcurrent protection starts automatically when the main protection fails. With the
appropriate parameterization (Emergency mode = caused by binary input), the emergency mode can
also be activated from an external source.
If the overcurrent protection is set as backup overcurrent protection (parameter Emergency mode = no), it
operates independently of the main protection and thus in parallel.
Blocking of the Stage with Measuring-Voltage Failure (Basic and Advanced Stage)
The stage can be blocked if a measuring-voltage failure occurs. In the event of blocking, the picked up stage
will be reset. The following blocking options are available for the stage:
•
From inside on pickup of the Measuring-voltage failure detection function (see chapter 8.3.2.1 Over-
view of Functions)
•
From an external source via the binary input signal >Open of the function block Volt.-transf. c.
b., which links in the tripping of the voltage-transformer circuit breaker
The Blk. by meas.-volt. failure parameter can be set so that measuring-voltage failure detection
blocks the stage or does not block it.
Application and Setting Notes
Parameter: Blk. by meas.-volt. failure
•
Recommended setting value (_:8131:10) Blk. by meas.-volt. failure = yes
You use the Blk. by meas.-volt. failure parameter to control the behavior of the stage when a
measuring-voltage failure is detected.
A measuring-voltage failure can only be detected if one of the following two conditions is met:
•
The device-internal supervision function Measuring-voltage failure detection is configured and
switched on.
•
The binary input signal >Open of the function block VTCB is connected to the voltage-transformer circuit
breaker (see chapter 8.3.4.1 Overview of Functions).
Parameter Value
Description
yes
The directional overcurrent-protection stage is blocked. Siemens recom-
mends that you retain the default setting, as correct direction determination
cannot be guaranteed if a measuring-voltage failure occurs.
no
The directional overcurrent-protection stage is not blocked.
7.6.3.2
Protection and Automation Functions
7.6 Directional Overcurrent Protection, Phases
668 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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