Siemens SIPROTEC 7SS52 - Page 55

 '(& )( )'& &) ( &!&  ")& &$(( $#   Ć %&( $# #)" &&#$ 
  

4 - 11
Siemens AG ⋅ May 1998
TRIP after one
measurement
&
&
1
1
d [āāS ||]/ dt
>
limit value
?
D -kxSāā |āāāā|
>0?
(characteriĆ
stic)
Measured vaĆ
lue
supervision
picked up
?
Diff-current
supervision
picked up
?
150 ms
(blocking time)
Figure 4.7 Logic for TRIP according to 1-out-of-1 evaluation
Diff-
current
supervision
picked up
?
D -kxS
IāāI>0?
(characteriĆ
stic)
Measured
value
supervision
picked up
?
&
t
1
=7ms
&
TRIP after
two measurements
1
1
time window 2
t
1
=7ms
time window 1
Figure 4.8 Logic diagram for TRIP according to "2-out-of-2 " evaluation
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