Blocking the Stage via Binary Input Signal
You can block the stage externally or internally via the binary input signal
>Block stage
. In the event of
blocking, the picked up stage will be reset.
Blocking the Stage in Case of Measuring-Voltage Failure
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
•
From an external source via the binary input signal
>open
of the function block Voltage-transformer
circuit breaker, 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 not.
Blocking the Time Delay
You can use the binary input signal
>Block delay & op.
to prevent the start of the time delay and thus
also the operate indication. A running time delay is reset. The pickup is indicated and a fault record is opened.
Blocking the Operate Indication via the Device-Internal Inrush-Current Detection Function
The Blk. w. inrush curr. detect. parameter allows you to define whether the operate indication of
the stage should be blocked by exceeding of the threshold values due to an inrush current. In case of a
blocking and fulfilled pickup conditions, the stage picks up. The start of the time delay and the operate indica-
tion are blocked. The function indicates this through a corresponding indication. If the blocking drops out and
the pickup conditions are still met, the time delay is started.
Application and Setting Notes
Parameter: Operate & flt.rec. blocked
•
Default setting (_:2) Operate & flt.rec. blocked = no
You can block the operate indication, the fault recording, and the fault log with the Operate & flt.rec.
blocked parameter. In this case, a ground-fault log is created instead of the fault log.
Parameter: Blk. by meas.-volt. failure
•
Recommended setting value (_: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 2 conditions is met:
•
The device-internal supervision function Measuring-voltage failure detection is configured and
enabled.
•
The binary input signal
>open
of the function block Voltage-transformer circuit breaker is connected to
the voltage-transformer circuit breaker.
Parameter Value
Description
yes
The protection stage is blocked (= default setting). Siemens recommends
using the default setting.
no
The protection stage is not blocked.
Parameter: Blk. w. inrush curr. detect.
•
Recommended setting value (_:27) Blk. w. inrush curr. detect. = no
6.15.7.2
Protection and Automation Functions
6.15 Sensitive Ground-Fault Detection
SIPROTEC 5, Overcurrent Protection, Manual 589
C53000-G5040-C017-8, Edition 07.2017
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