[dwsinphi-011112-01.tif, 4, en_US]
Figure 6-129
Direction-Characteristic Curve with Sin φ Measurement
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 does not block it.
Blocking the Pickup with Detection of the Fault Extinction
Using the evaluation of the instantaneous value developing of the zero-sequence voltage, the fault extinction
can be recognized faster than via the dropout of the V0 fundamental-component value under the pickup
value. The pickup of the stage is blocked with the fast detection of the fault extinction. With this, the pickups
are avoided due to the decay procedure in the zero-sequence system after the fault extinction. With the Blk.
after fault extinction parameter, you enable or disable this accelerated detection of the fault extinc-
tion.
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.
Protection and Automation Functions
6.15 Sensitive Ground-Fault Detection
SIPROTEC 5, Overcurrent Protection, Manual 573
C53000-G5040-C017-8, Edition 07.2017
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