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: 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 linked with
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
With the Blk. w. inrush curr. detect. parameter, you specify whether the operate is blocked during
detection of an inrush current.
Siemens recommends disabling the blocking. The fundamental component of the zero-sequence voltage is a
reliable criterion for the ground fault and remains untouched by an enabling procedure.
Parameter: Blk. after fault extinction
•
Recommended setting value (_:110) Blk. after fault extinction = yes
If the Blk. after fault extinction parameter is set to yes, the pickup is blocked after 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. Siemens recommends using the default setting.
Parameter: Directional mode
•
Default setting (_:108) Directional mode = forward
When a fault is detected, the selection of the parameter Directional mode defines whether the pickup of
the stage occurs in forward or backward direction.
Parameter: Dir. measuring method, φ correction, Polarized G0/B0 threshold, 3I0> release
thresh. value
•
Default setting (_:109) Dir. measuring method = G0
•
Default setting (_:107) φ correction = 0.0°
•
Default setting (_:102) Polarized G0/B0 threshold = 2.00 mS
•
Default setting (_:101) 3I0> release thresh. value = 0.002 A
6.15.8.2
Protection and Automation Functions
6.15 Sensitive Ground-Fault Detection
596 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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