Siemens 6MD86 - Blocking of the Tripping by Device-Internal Inrush-Current Detection; Description; Application and Setting Notes

No. Information Data Class
(Type)
Type
_:67 User curve #:Dyn.set. BI active SPS O
_:68 User curve #:Dyn. set. blks. pickup SPS O
_:59 User curve #:Disk emulation running SPS O
_:55 User curve #:Pickup ACD O
_:56 User curve #:Operate delay expired ACT O
_:57 User curve #:Operate ACT O
Blocking of the Tripping by Device-Internal Inrush-Current Detection
Description
With the Blk. w. inrush curr. detect. parameter, you can define whether tripping of the stage
should be blocked when a threshold value is exceeded due to an inrush current. In case of a blocking, the
stage picks up. The start of the tripping delay and the trip signal are blocked. The function signals this through
a corresponding indication. If the blocking drops out and the threshold value of the stage is still exceeded, the
time delay is started. After that time, the stage operates. The following figure only shows the part of the stage
(exemplified by definite-time overcurrent protection stage 1) that illustrates the influence of the inrush-
current detection. Only if the central function Inrush-current detection (see section 11.12 Inrush-Current
Detection) is in effect can the blocking be set.
[loocpgrd-210812-01.tif, 1, en_US]
Figure 7-85 Part-Logic Diagram on the Influence of Inrush-Current Detection Exemplified by the 1st Defi-
nite-Time Overcurrent Protection Stage
Application and Setting Notes
Parameter: Blk. w. inrush curr. detect.
•
Default setting (_:751:27) Blk. w. inrush curr. detect. = no
7.5.7
7.5.7.1
7.5.7.2
Protection and Automation Functions
7.5 Overcurrent Protection, Ground
SIPROTEC 5, High-Voltage Bay Controller, Manual 661
C53000-G5040-C015-9, Edition 11.2017