Measurands/Input Values
The measurand/input values of the counter stage are phase-segregated and group-segregated counter
contents that are determined in the General FB.
Pickup, Operate Delay
With the parameter Type of counting phases, a selection is made whether the supervision function
occurs in a phase-segregated way or with the sum value of the phases. With the parameter Type of
counting groups, a selection is made whether the supervision function occurs in a group-segregated way
or with the sum value of both groups. If a counter reaches the set threshold, the stage picks up. The pickup
starts the time delay. If the time delay has elapsed, the operate indication will be issued.
Automatic Compensation
If the automatic compensation function is enabled, the counter stage is working. If this is not the case, the
readiness status of the stage changes to the state
Warning
.
Application and Setting Notes
General Notes
•
The setting notes for the current-threshold value for counting faulty C-elements are provided in chapter
7.5.3.2 Application and Setting Notes as you must set this parameter across all stages.
•
In order to react quickly to the simultaneous fault of many C-elements, always use an overcurrent-protec-
tion stage I> with a short operate delay (< 100 ms) in addition to the counter stage. This is necessary as
the counter function counts each current jump only once, regardless of its height.
Parameter: Type of counting groups
•
Default setting (_:16261:101) Type of counting groups = segregated
With the parameter Type of counting groups, you specify whether the group-segregated counter status
or the sum value of both group counters are compared to the threshold.
Parameter: Type of counting phases
•
Default setting (_:16261:102) Type of counting phases = segregated
With the parameter Type of counting phases, you specify whether the supervision function occurs in a
phase-segregated way or with the sum value of the phases.
Parameter: Maximum Number of Faulty Elements, Operate delay
•
Default setting (_:16261:103) Max. no. of def. elem. phs A = 10
•
Default setting (_:16261:104) Max. no. of def. elem. phs B = 10
•
Default setting (_:16261:105) Max. no. of def. elem. phs C = 10
•
Default setting (_:16261:106) Max. no. of def. elem. = 10
•
Default setting (_:16261:6) Operate delay = 0.00 s
Set the parameters for the specific application.
7.5.5.2
Capacitor Bank Protection
7.5 Current-Unbalance Protection for Capacitors, 1-Phase
SIPROTEC 5, Overcurrent Protection, Manual 1017
C53000-G5040-C017-8, Edition 07.2017
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