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4 Technical Data
Influencing
Variables for
Pickup
420
Power Supply Direct Voltage in Range
0.8 ≤ V
≤ 1.15
/ V
PS
PS nominal
Temperature in Range
23 °F ≤ ϑ
≤ 131 °F
amb
–5 °C ≤ ϑ
≤ 55 °C
amb
Frequency in Range
0.95 ≤ f/f
≤ 1.05
N
I
diff
-------- -
10
I
N
9
8
2031
I DIFF>>
7
6
5
4
3
2
b
1
2021
a
I DIFF>
1
2
3
BASE POINT 2
BASE POINT 1
Figure 4-8
Pickup Characteristic of the Transformer Differential Protection
10.0
Figure 4-9 Restraining Influence of 2nd Harmonics in Transformer Differential Protection
1 %
0.3 % / 10 °F
0.5 % / 10 K
1 % (see also Figure 4-11)
Fault characteristic
Tripping
Add-On Stabilization
4
5
6
7
8
9
I
fN
I
N
Can be set to e.g.
I
DIFF
Trip-
ping
5,0
Blocking
2.0
Can be set to
e.g. 2ndharmonics = 15 %
1.0
0.5
Can be set to e.g.
I
>/I N = 0.2
DIFF
0.2
0.1
0
0.1
0.2
0.3
Blocking
SLOPE 2
c
SLOPE 1
10 11 12 13 14 15 16 17 18
>>/I N = 10
I
2f
0.4
0.5
I
fN
C53000-G1176-C149-3
d
I
stab
----------- -
I
N
7UM62 Manual
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