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Functions
6-70
es. This is referred to as cross-blocking and can be enabled at address . Inrush
currents flowing in the ground path will not cross-block tripping by the phase elements.
The cross-blocking function may also be limited to a particular time interval, which can
be set at address . After expiration of this time interval, the cross-blocking func-
tion will be disabled.
φ
A
2nd Harmonic
!!!Ã!qÃC6SHPID8
φ
1/2 ac cycle
A
I
!!$ÃDÃHh‘
φ
A
50-1 PU
or
φ
A
51 PU
φ
A
67-1 PU
or
φ
A
67-TOC PU
Inrush Recog. 50-1
Inrush Recog. 67-1
Inrush Recog. 51
or
Inrush Recog. 67-TOC
!!"Ã8SPTTÃ7GP8F
`@T
"1"
IP
F# 7563
>BLOCK InRushPh
!! ÃDISVTCÃS@TU
PI
PAA
"1"
Figure 6-31
Logic Diagram for Inrush Restraint
a
a > b ⋅ c
&
b
&
c
a
a < b
b
1 ac cycle
or
1 ac cycle
!!#Ã8SPTTÃ7GFÃUDH@S
&
&
0
T
Measurement/Logic
or
F# 7565
Ia InRush PU
F# 7566
Ib InRush PU
F# 7567
Ic InRush PU
F# 7564
Gnd InRush PU
Inrush Recog.
or
&
50-1
Inrush Recog.
&
50N-1
or
Inrush Recog.
&
51
or
Inrush Recog.
51N
&
Inrush Recog.
67-1
or
&
Inrush Recog.
67N-1
&
or
Inrush Recog.
TOC
&
Inrush Recog.
67N-TOC
&
InrushCrossBlck
S
Q
Inrush Detection for Phase
R
and Ground Faults (50-
1,50N-1, 51-1, 51N-1, 51N-
TOC, 67-1, 67-TOC, 67N-1,
67N-TOC)
F# 7557
InRush PhBLOCKED
F# 7556
InRush OFF
7SJ63 Manual
C53000-G1140-C120-1
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