Siemens SIPROTEC 7UM62, Manual

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Functions
130
7UM62 Manual
C53000-G1176-C149-3
Consequently, the secondary side setting value of zone 1 at address
3306 ZONE Z1
is:
Note: The following ratio would result from the connection of a 5 A device to a 5 A
transformer:
The following primary reactance results for a 100 % reach for zone 2:
The following secondary side setting value of zone 2 results at address
3310 ZONE
Z2
:
Figure 2-62 Time Grading for Machine Impedance Protection – Example
Z1B Overreach
Zone The Z1B overreach zone (address
3308 ZONE Z1B
) is an externally controlled stage
which does not influence the Z1 normal stage. Consequently, there is no changeover,
but the overreach zone is switched effective or ineffective, depending on the position
of the high-voltage side circuit breaker.
Z1
secondary
500 A 1 A
⁄
6.3 kV 100 V
⁄
------------------------------------
0.3669
Ω ⋅
2.91
Ω
= =
Z1
secondary
500 A 5 A
⁄
6.3 kV 100 V
⁄
------------------------------------
0.3669
Ω ⋅
0.58
Ω
= =
Z2
prim
100
100
----------
7
100
----------
6.3
2
5.3
-----------
⋅ ⋅
0.5242
Ω
= =
Z2
secondary
500 A 1 A
⁄
6.3 kV 100 V
⁄
------------------------------------ 0.5242
Ω ⋅
4.16
Ω
= =
Z<
t
T3
Z
Z1
(X
1
,
R
1
)
T1
T2
Z1B
(X
1B
,
R
1B
)
Z2
(X
2
,
R
2
)
Internal consumption
BI
X
1
=0.70*X
1Transf
X
1
=X
1Transf
G