Table of Contents
Advertisement
7UM62 Manual
C53000-G1176-C149-3
Figure 2-68 shows the logic diagram of the out-of-step protection. The feature has two
stages and can be blocked by a binary input.
U
L1
U
L2
U
L3
U
U
1
1
------- -
=
Z
1
I
1
I
L1
I
L2
I
I
L3
1
I
2
>
I
1
I
<
2
FNo. 05053
>BLOCK O/S
Figure 2-68
Logic Diagram of the Out-of-Step Protection
3512 T-SIGNAL
3511 T-HOLDING
Release
Reset
Increment
Characteristic 1
3509 REP. CHAR. 1
3512 T-SIGNAL
3511 T-HOLDING
Release
Reset
Increment
Characteristic 2
3510 REP. CHAR. 2
&
– Out-of-step signal for the duration of T-SIGNAL
O/S
Ch. 1
– Characteristic 1
Ch. 2
– Characteristic 2
U
– Complex positive sequence component of the voltages
1
– Complex positive sequence component of the currents
I
1
I
– Complex negative sequence component of the currents ^
2
Out-of-Step Protection (ANSI 78)
FNo. 05067
O/S char. 1
FNo. 05069
O/S det. char.1
FNo. 05071
n=0
n ≥ 1
O/S TRIP char.1
n=n+1 n ≥ n1
&
FNo. 05068
O/S char. 2
FNo. 0507
O/S det. char.2
FNo. 05072
n=0
n ≥
1
O/S TRIP char.2
n
n=n+1
≥ n2
&
Tripping
matrix
TMin
TRIP CMD
FNo. 05062
O/S BLOCKED
141
Advertisement
Table of Contents
