Processing Of The Circuit Breaker Position - Siemens siprotec 7SA6 User Manual

6.20.2 Processing of the Circuit Breaker Position

7SA6 Manual
C53000-G1176-C133-1
L+
control
switch
Close
CB
8‚vy
L–
Figure 6-139 Manual closure with internal automatic reclosure
L+
external
automatic reclosure
close
command
Close
CB
8‚vy
L–
Figure 6-140 Manual closure with external automatic reclosure
Information regarding the circuit breaker position is required by various protection and
supplementary functions to ensure their optimal functionality. This is for example of
assistance for
− the echo function in comparison schemes with distance protection
(refer to Subsection 6.4.1.11)
− the echo function in the earth fault directional comparison pick-up
(refer to Subsection 6.6.1.5)
− weak infeed tripping (refer to Subsection 6.7.1)
− the high-current instantaneous tripping (6.10.1)
− the plausibility check before automatic reclosure (refer to Subsection 6.12.1)
− the circuit breaker failure protection (refer to Subsection 6.16.1)
− verification of the reset condition for the trip command (refer to Subsection 6.20.4)
− the circuit breaker test by means of the trip-close test cycle
(refer also to Subsection 6.20.5)
A circuit breaker position logic is incorporated in the device (Figure 6-141). Depending
on the type of auxiliary contact(s) provided by the circuit breaker and the method in
which these are connected to the device, there are several alternatives of
implementing this logic.
7SA6
FNo 356
>Manual Close
FNo 2851
AR CLOSE Cmd.
Legend:
CB — circuit breaker
Close — circuit breaker close pulse
control
switch
FNo 356
>Manual Close
Legend:
CB — circuit breaker
Close — circuit breaker close pulse
Functions
7SA6
6-269